Adding upstream version 5.4.1.upstream/5.4.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

35 files changed, 14525 insertions, 0 deletions

diff --git a/src/xz/Makefile.am b/src/xz/Makefile.am
new file mode 100644
index 0000000..4bc64f3
--- /dev/null
+++ b/src/xz/Makefile.am
@@ -0,0 +1,133 @@
+##
+## Author: Lasse Collin
+##
+## This file has been put into the public domain.
+## You can do whatever you want with this file.
+##
+
+bin_PROGRAMS = xz
+
+xz_SOURCES = \
+	args.c \
+	args.h \
+	coder.c \
+	coder.h \
+	file_io.c \
+	file_io.h \
+	hardware.c \
+	hardware.h \
+	main.c \
+	main.h \
+	message.c \
+	message.h \
+	mytime.c \
+	mytime.h \
+	options.c \
+	options.h \
+	private.h \
+	signals.c \
+	signals.h \
+	suffix.c \
+	suffix.h \
+	util.c \
+	util.h \
+	../common/tuklib_open_stdxxx.c \
+	../common/tuklib_progname.c \
+	../common/tuklib_exit.c \
+	../common/tuklib_mbstr_width.c \
+	../common/tuklib_mbstr_fw.c
+
+if COND_MAIN_DECODER
+xz_SOURCES += \
+	list.c \
+	list.h
+endif
+
+if COND_W32
+xz_SOURCES += xz_w32res.rc
+endif
+
+xz_CPPFLAGS = \
+	-DLOCALEDIR=\"$(localedir)\" \
+	-I$(top_srcdir)/src/common \
+	-I$(top_srcdir)/src/liblzma/api \
+	-I$(top_builddir)/lib
+
+xz_LDADD = $(top_builddir)/src/liblzma/liblzma.la $(CAPSICUM_LIB)
+
+if COND_GNULIB
+xz_LDADD += $(top_builddir)/lib/libgnu.a
+endif
+
+# libgnu.a may need these libs, so this must be after libgnu.a.
+xz_LDADD += $(LTLIBINTL)
+
+
+# Windows resource compiler support
+.rc.o:
+	$(RC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
+		$(xz_CPPFLAGS) $(CPPFLAGS) $(RCFLAGS) -i $< -o $@
+
+
+dist_man_MANS = xz.1
+
+
+## Create symlinks for unxz and xzcat for convenience. Create symlinks also
+## for lzma, unlzma, and lzcat for compatibility with LZMA Utils 4.32.x.
+xzlinks = unxz xzcat
+
+if COND_LZMALINKS
+xzlinks += lzma unlzma lzcat
+endif
+
+install-exec-hook:
+	cd "$(DESTDIR)$(bindir)" && \
+	target=`echo xz | sed '$(transform)'`$(EXEEXT) && \
+	for name in $(xzlinks); do \
+		link=`echo $$name | sed '$(transform)'`$(LN_EXEEXT) && \
+		rm -f "$$link" && \
+		$(LN_S) "$$target" "$$link"; \
+	done
+
+# The installation of translated man pages abuses Automake internals
+# by calling "install-man" with redefined dist_man_MANS and man_MANS.
+# If this breaks some day, don't blame Automake developers.
+install-data-hook:
+	languages= ; \
+	if test "$(USE_NLS)" = yes && test -d "$(top_srcdir)/po4a/man"; then \
+		languages=`ls "$(top_srcdir)/po4a/man"`; \
+	fi; \
+	target=`echo xz | sed '$(transform)'` && \
+	for lang in . $$languages; do \
+		man="$(top_srcdir)/po4a/man/$$lang/xz.1" ; \
+		if test -f "$$man"; then \
+			$(MAKE) dist_man_MANS="$$man" man_MANS= \
+				mandir="$(mandir)/$$lang" install-man; \
+		fi; \
+		man1dir="$(DESTDIR)$(mandir)/$$lang/man1" && \
+		if test -f "$$man1dir/$$target.1"; then ( \
+			cd "$$man1dir" && \
+			for name in $(xzlinks); do \
+				link=`echo $$name | sed '$(transform)'` && \
+				rm -f "$$link.1" && \
+				$(LN_S) "$$target.1" "$$link.1"; \
+			done \
+		); fi; \
+	done
+
+uninstall-hook:
+	cd "$(DESTDIR)$(bindir)" && \
+	for name in $(xzlinks); do \
+		link=`echo $$name | sed '$(transform)'`$(LN_EXEEXT) && \
+		rm -f "$$link"; \
+	done
+	languages= ; \
+	if test "$(USE_NLS)" = yes && test -d "$(top_srcdir)/po4a/man"; then \
+		languages=`ls "$(top_srcdir)/po4a/man"`; \
+	fi; \
+	for lang in . $$languages; do \
+		for name in xz $(xzlinks); do \
+			name=`echo $$name | sed '$(transform)'` && \
+			rm -f "$(DESTDIR)$(mandir)/$$lang/man1/$$name.1"; \
+		done; \
+	done
diff --git a/src/xz/Makefile.in b/src/xz/Makefile.in
new file mode 100644
index 0000000..e6422c5
--- /dev/null
+++ b/src/xz/Makefile.in
@@ -0,0 +1,1162 @@
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+	mytime.c mytime.h options.c options.h private.h signals.c \
+	signals.h suffix.c suffix.h util.c util.h \
+	../common/tuklib_open_stdxxx.c ../common/tuklib_progname.c \
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+	-I$(top_builddir)/lib
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+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/xz/Makefile
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+	  *config.status*) \
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+xz-list.o: list.c
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+
+xz-list.obj: list.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(xz_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT xz-list.obj -MD -MP -MF $(DEPDIR)/xz-list.Tpo -c -o xz-list.obj `if test -f 'list.c'; then $(CYGPATH_W) 'list.c'; else $(CYGPATH_W) '$(srcdir)/list.c'; fi`
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+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+install-man1: $(dist_man_MANS)
+	@$(NORMAL_INSTALL)
+	@list1=''; \
+	list2='$(dist_man_MANS)'; \
+	test -n "$(man1dir)" \
+	  && test -n "`echo $$list1$$list2`" \
+	  || exit 0; \
+	echo " $(MKDIR_P) '$(DESTDIR)$(man1dir)'"; \
+	$(MKDIR_P) "$(DESTDIR)$(man1dir)" || exit 1; \
+	{ for i in $$list1; do echo "$$i"; done;  \
+	if test -n "$$list2"; then \
+	  for i in $$list2; do echo "$$i"; done \
+	    | sed -n '/\.1[a-z]*$$/p'; \
+	fi; \
+	} | while read p; do \
+	  if test -f $$p; then d=; else d="$(srcdir)/"; fi; \
+	  echo "$$d$$p"; echo "$$p"; \
+	done | \
+	sed -e 'n;s,.*/,,;p;h;s,.*\.,,;s,^[^1][0-9a-z]*$$,1,;x' \
+	      -e 's,\.[0-9a-z]*$$,,;$(transform);G;s,\n,.,' | \
+	sed 'N;N;s,\n, ,g' | { \
+	list=; while read file base inst; do \
+	  if test "$$base" = "$$inst"; then list="$$list $$file"; else \
+	    echo " $(INSTALL_DATA) '$$file' '$(DESTDIR)$(man1dir)/$$inst'"; \
+	    $(INSTALL_DATA) "$$file" "$(DESTDIR)$(man1dir)/$$inst" || exit $$?; \
+	  fi; \
+	done; \
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+	while read files; do \
+	  test -z "$$files" || { \
+	    echo " $(INSTALL_DATA) $$files '$(DESTDIR)$(man1dir)'"; \
+	    $(INSTALL_DATA) $$files "$(DESTDIR)$(man1dir)" || exit $$?; }; \
+	done; }
+
+uninstall-man1:
+	@$(NORMAL_UNINSTALL)
+	@list=''; test -n "$(man1dir)" || exit 0; \
+	files=`{ for i in $$list; do echo "$$i"; done; \
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+	  sed -n '/\.1[a-z]*$$/p'; \
+	} | sed -e 's,.*/,,;h;s,.*\.,,;s,^[^1][0-9a-z]*$$,1,;x' \
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+	  test -n "$$unique" || unique=$$empty_fix; \
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+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
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+
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+	     $$unique
+
+GTAGS:
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+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+
+distdir-am: $(DISTFILES)
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(PROGRAMS) $(MANS)
+installdirs:
+	for dir in "$(DESTDIR)$(bindir)" "$(DESTDIR)$(man1dir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
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+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-binPROGRAMS clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/xz-args.Po
+	-rm -f ./$(DEPDIR)/xz-coder.Po
+	-rm -f ./$(DEPDIR)/xz-file_io.Po
+	-rm -f ./$(DEPDIR)/xz-hardware.Po
+	-rm -f ./$(DEPDIR)/xz-list.Po
+	-rm -f ./$(DEPDIR)/xz-main.Po
+	-rm -f ./$(DEPDIR)/xz-message.Po
+	-rm -f ./$(DEPDIR)/xz-mytime.Po
+	-rm -f ./$(DEPDIR)/xz-options.Po
+	-rm -f ./$(DEPDIR)/xz-signals.Po
+	-rm -f ./$(DEPDIR)/xz-suffix.Po
+	-rm -f ./$(DEPDIR)/xz-tuklib_exit.Po
+	-rm -f ./$(DEPDIR)/xz-tuklib_mbstr_fw.Po
+	-rm -f ./$(DEPDIR)/xz-tuklib_mbstr_width.Po
+	-rm -f ./$(DEPDIR)/xz-tuklib_open_stdxxx.Po
+	-rm -f ./$(DEPDIR)/xz-tuklib_progname.Po
+	-rm -f ./$(DEPDIR)/xz-util.Po
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+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/xz-args.Po
+	-rm -f ./$(DEPDIR)/xz-coder.Po
+	-rm -f ./$(DEPDIR)/xz-file_io.Po
+	-rm -f ./$(DEPDIR)/xz-hardware.Po
+	-rm -f ./$(DEPDIR)/xz-list.Po
+	-rm -f ./$(DEPDIR)/xz-main.Po
+	-rm -f ./$(DEPDIR)/xz-message.Po
+	-rm -f ./$(DEPDIR)/xz-mytime.Po
+	-rm -f ./$(DEPDIR)/xz-options.Po
+	-rm -f ./$(DEPDIR)/xz-signals.Po
+	-rm -f ./$(DEPDIR)/xz-suffix.Po
+	-rm -f ./$(DEPDIR)/xz-tuklib_exit.Po
+	-rm -f ./$(DEPDIR)/xz-tuklib_mbstr_fw.Po
+	-rm -f ./$(DEPDIR)/xz-tuklib_mbstr_width.Po
+	-rm -f ./$(DEPDIR)/xz-tuklib_open_stdxxx.Po
+	-rm -f ./$(DEPDIR)/xz-tuklib_progname.Po
+	-rm -f ./$(DEPDIR)/xz-util.Po
+	-rm -f Makefile
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+uninstall-am: uninstall-binPROGRAMS uninstall-man
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+	$(MAKE) $(AM_MAKEFLAGS) uninstall-hook
+uninstall-man: uninstall-man1
+
+.MAKE: install-am install-data-am install-exec-am install-strip \
+	uninstall-am
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-binPROGRAMS clean-generic clean-libtool cscopelist-am \
+	ctags ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-binPROGRAMS \
+	install-data install-data-am install-data-hook install-dvi \
+	install-dvi-am install-exec install-exec-am install-exec-hook \
+	install-html install-html-am install-info install-info-am \
+	install-man install-man1 install-pdf install-pdf-am install-ps \
+	install-ps-am install-strip installcheck installcheck-am \
+	installdirs maintainer-clean maintainer-clean-generic \
+	mostlyclean mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-binPROGRAMS uninstall-hook \
+	uninstall-man uninstall-man1
+
+.PRECIOUS: Makefile
+
+
+# Windows resource compiler support
+.rc.o:
+	$(RC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
+		$(xz_CPPFLAGS) $(CPPFLAGS) $(RCFLAGS) -i $< -o $@
+
+install-exec-hook:
+	cd "$(DESTDIR)$(bindir)" && \
+	target=`echo xz | sed '$(transform)'`$(EXEEXT) && \
+	for name in $(xzlinks); do \
+		link=`echo $$name | sed '$(transform)'`$(LN_EXEEXT) && \
+		rm -f "$$link" && \
+		$(LN_S) "$$target" "$$link"; \
+	done
+
+# The installation of translated man pages abuses Automake internals
+# by calling "install-man" with redefined dist_man_MANS and man_MANS.
+# If this breaks some day, don't blame Automake developers.
+install-data-hook:
+	languages= ; \
+	if test "$(USE_NLS)" = yes && test -d "$(top_srcdir)/po4a/man"; then \
+		languages=`ls "$(top_srcdir)/po4a/man"`; \
+	fi; \
+	target=`echo xz | sed '$(transform)'` && \
+	for lang in . $$languages; do \
+		man="$(top_srcdir)/po4a/man/$$lang/xz.1" ; \
+		if test -f "$$man"; then \
+			$(MAKE) dist_man_MANS="$$man" man_MANS= \
+				mandir="$(mandir)/$$lang" install-man; \
+		fi; \
+		man1dir="$(DESTDIR)$(mandir)/$$lang/man1" && \
+		if test -f "$$man1dir/$$target.1"; then ( \
+			cd "$$man1dir" && \
+			for name in $(xzlinks); do \
+				link=`echo $$name | sed '$(transform)'` && \
+				rm -f "$$link.1" && \
+				$(LN_S) "$$target.1" "$$link.1"; \
+			done \
+		); fi; \
+	done
+
+uninstall-hook:
+	cd "$(DESTDIR)$(bindir)" && \
+	for name in $(xzlinks); do \
+		link=`echo $$name | sed '$(transform)'`$(LN_EXEEXT) && \
+		rm -f "$$link"; \
+	done
+	languages= ; \
+	if test "$(USE_NLS)" = yes && test -d "$(top_srcdir)/po4a/man"; then \
+		languages=`ls "$(top_srcdir)/po4a/man"`; \
+	fi; \
+	for lang in . $$languages; do \
+		for name in xz $(xzlinks); do \
+			name=`echo $$name | sed '$(transform)'` && \
+			rm -f "$(DESTDIR)$(mandir)/$$lang/man1/$$name.1"; \
+		done; \
+	done
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/xz/args.c b/src/xz/args.c
new file mode 100644
index 0000000..b0a1174
--- /dev/null
+++ b/src/xz/args.c
@@ -0,0 +1,751 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       args.c
+/// \brief      Argument parsing
+///
+/// \note       Filter-specific options parsing is in options.c.
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+
+#include "getopt.h"
+#include <ctype.h>
+
+
+bool opt_stdout = false;
+bool opt_force = false;
+bool opt_keep_original = false;
+bool opt_robot = false;
+bool opt_ignore_check = false;
+
+// We don't modify or free() this, but we need to assign it in some
+// non-const pointers.
+const char stdin_filename[] = "(stdin)";
+
+
+/// Parse and set the memory usage limit for compression, decompression,
+/// and/or multithreaded decompression.
+static void
+parse_memlimit(const char *name, const char *name_percentage, const char *str,
+		bool set_compress, bool set_decompress, bool set_mtdec)
+{
+	bool is_percentage = false;
+	uint64_t value;
+
+	const size_t len = strlen(str);
+	if (len > 0 && str[len - 1] == '%') {
+		// Make a copy so that we can get rid of %.
+		//
+		// In the past str wasn't const and we modified it directly
+		// but that modified argv[] and thus affected what was visible
+		// in "ps auxf" or similar tools which was confusing. For
+		// example, --memlimit=50% would show up as --memlimit=50
+		// since the percent sign was overwritten here.
+		char *s = xstrdup(str);
+		s[len - 1] = '\0';
+		is_percentage = true;
+		value = str_to_uint64(name_percentage, s, 1, 100);
+		free(s);
+	} else {
+		// On 32-bit systems, SIZE_MAX would make more sense than
+		// UINT64_MAX. But use UINT64_MAX still so that scripts
+		// that assume > 4 GiB values don't break.
+		value = str_to_uint64(name, str, 0, UINT64_MAX);
+	}
+
+	hardware_memlimit_set(value, set_compress, set_decompress, set_mtdec,
+			is_percentage);
+	return;
+}
+
+
+static void
+parse_block_list(const char *str_const)
+{
+	// We need a modifiable string in the for-loop.
+	char *str_start = xstrdup(str_const);
+	char *str = str_start;
+
+	// It must be non-empty and not begin with a comma.
+	if (str[0] == '\0' || str[0] == ',')
+		message_fatal(_("%s: Invalid argument to --block-list"), str);
+
+	// Count the number of comma-separated strings.
+	size_t count = 1;
+	for (size_t i = 0; str[i] != '\0'; ++i)
+		if (str[i] == ',')
+			++count;
+
+	// Prevent an unlikely integer overflow.
+	if (count > SIZE_MAX / sizeof(uint64_t) - 1)
+		message_fatal(_("%s: Too many arguments to --block-list"),
+				str);
+
+	// Allocate memory to hold all the sizes specified.
+	// If --block-list was specified already, its value is forgotten.
+	free(opt_block_list);
+	opt_block_list = xmalloc((count + 1) * sizeof(uint64_t));
+
+	for (size_t i = 0; i < count; ++i) {
+		// Locate the next comma and replace it with \0.
+		char *p = strchr(str, ',');
+		if (p != NULL)
+			*p = '\0';
+
+		if (str[0] == '\0') {
+			// There is no string, that is, a comma follows
+			// another comma. Use the previous value.
+			//
+			// NOTE: We checked earlier that the first char
+			// of the whole list cannot be a comma.
+			assert(i > 0);
+			opt_block_list[i] = opt_block_list[i - 1];
+		} else {
+			opt_block_list[i] = str_to_uint64("block-list", str,
+					0, UINT64_MAX);
+
+			// Zero indicates no more new Blocks.
+			if (opt_block_list[i] == 0) {
+				if (i + 1 != count)
+					message_fatal(_("0 can only be used "
+							"as the last element "
+							"in --block-list"));
+
+				opt_block_list[i] = UINT64_MAX;
+			}
+		}
+
+		str = p + 1;
+	}
+
+	// Terminate the array.
+	opt_block_list[count] = 0;
+
+	free(str_start);
+	return;
+}
+
+
+static void
+parse_real(args_info *args, int argc, char **argv)
+{
+	enum {
+		OPT_X86 = INT_MIN,
+		OPT_POWERPC,
+		OPT_IA64,
+		OPT_ARM,
+		OPT_ARMTHUMB,
+		OPT_ARM64,
+		OPT_SPARC,
+		OPT_DELTA,
+		OPT_LZMA1,
+		OPT_LZMA2,
+
+		OPT_SINGLE_STREAM,
+		OPT_NO_SPARSE,
+		OPT_FILES,
+		OPT_FILES0,
+		OPT_BLOCK_SIZE,
+		OPT_BLOCK_LIST,
+		OPT_MEM_COMPRESS,
+		OPT_MEM_DECOMPRESS,
+		OPT_MEM_MT_DECOMPRESS,
+		OPT_NO_ADJUST,
+		OPT_INFO_MEMORY,
+		OPT_ROBOT,
+		OPT_FLUSH_TIMEOUT,
+		OPT_IGNORE_CHECK,
+	};
+
+	static const char short_opts[]
+			= "cC:defF:hHlkM:qQrS:tT:vVz0123456789";
+
+	static const struct option long_opts[] = {
+		// Operation mode
+		{ "compress",     no_argument,       NULL,  'z' },
+		{ "decompress",   no_argument,       NULL,  'd' },
+		{ "uncompress",   no_argument,       NULL,  'd' },
+		{ "test",         no_argument,       NULL,  't' },
+		{ "list",         no_argument,       NULL,  'l' },
+
+		// Operation modifiers
+		{ "keep",         no_argument,       NULL,  'k' },
+		{ "force",        no_argument,       NULL,  'f' },
+		{ "stdout",       no_argument,       NULL,  'c' },
+		{ "to-stdout",    no_argument,       NULL,  'c' },
+		{ "single-stream", no_argument,      NULL,  OPT_SINGLE_STREAM },
+		{ "no-sparse",    no_argument,       NULL,  OPT_NO_SPARSE },
+		{ "suffix",       required_argument, NULL,  'S' },
+		// { "recursive",      no_argument,       NULL,  'r' }, // TODO
+		{ "files",        optional_argument, NULL,  OPT_FILES },
+		{ "files0",       optional_argument, NULL,  OPT_FILES0 },
+
+		// Basic compression settings
+		{ "format",       required_argument, NULL,  'F' },
+		{ "check",        required_argument, NULL,  'C' },
+		{ "ignore-check", no_argument,       NULL,  OPT_IGNORE_CHECK },
+		{ "block-size",   required_argument, NULL,  OPT_BLOCK_SIZE },
+		{ "block-list",  required_argument, NULL,  OPT_BLOCK_LIST },
+		{ "memlimit-compress",   required_argument, NULL, OPT_MEM_COMPRESS },
+		{ "memlimit-decompress", required_argument, NULL, OPT_MEM_DECOMPRESS },
+		{ "memlimit-mt-decompress", required_argument, NULL, OPT_MEM_MT_DECOMPRESS },
+		{ "memlimit",     required_argument, NULL,  'M' },
+		{ "memory",       required_argument, NULL,  'M' }, // Old alias
+		{ "no-adjust",    no_argument,       NULL,  OPT_NO_ADJUST },
+		{ "threads",      required_argument, NULL,  'T' },
+		{ "flush-timeout", required_argument, NULL, OPT_FLUSH_TIMEOUT },
+
+		{ "extreme",      no_argument,       NULL,  'e' },
+		{ "fast",         no_argument,       NULL,  '0' },
+		{ "best",         no_argument,       NULL,  '9' },
+
+		// Filters
+		{ "lzma1",        optional_argument, NULL,  OPT_LZMA1 },
+		{ "lzma2",        optional_argument, NULL,  OPT_LZMA2 },
+		{ "x86",          optional_argument, NULL,  OPT_X86 },
+		{ "powerpc",      optional_argument, NULL,  OPT_POWERPC },
+		{ "ia64",         optional_argument, NULL,  OPT_IA64 },
+		{ "arm",          optional_argument, NULL,  OPT_ARM },
+		{ "armthumb",     optional_argument, NULL,  OPT_ARMTHUMB },
+		{ "arm64",        optional_argument, NULL,  OPT_ARM64 },
+		{ "sparc",        optional_argument, NULL,  OPT_SPARC },
+		{ "delta",        optional_argument, NULL,  OPT_DELTA },
+
+		// Other options
+		{ "quiet",        no_argument,       NULL,  'q' },
+		{ "verbose",      no_argument,       NULL,  'v' },
+		{ "no-warn",      no_argument,       NULL,  'Q' },
+		{ "robot",        no_argument,       NULL,  OPT_ROBOT },
+		{ "info-memory",  no_argument,       NULL,  OPT_INFO_MEMORY },
+		{ "help",         no_argument,       NULL,  'h' },
+		{ "long-help",    no_argument,       NULL,  'H' },
+		{ "version",      no_argument,       NULL,  'V' },
+
+		{ NULL,           0,                 NULL,   0 }
+	};
+
+	int c;
+
+	while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL))
+			!= -1) {
+		switch (c) {
+		// Compression preset (also for decompression if --format=raw)
+		case '0': case '1': case '2': case '3': case '4':
+		case '5': case '6': case '7': case '8': case '9':
+			coder_set_preset((uint32_t)(c - '0'));
+			break;
+
+		// --memlimit-compress
+		case OPT_MEM_COMPRESS:
+			parse_memlimit("memlimit-compress",
+					"memlimit-compress%", optarg,
+					true, false, false);
+			break;
+
+		// --memlimit-decompress
+		case OPT_MEM_DECOMPRESS:
+			parse_memlimit("memlimit-decompress",
+					"memlimit-decompress%", optarg,
+					false, true, false);
+			break;
+
+		// --memlimit-mt-decompress
+		case OPT_MEM_MT_DECOMPRESS:
+			parse_memlimit("memlimit-mt-decompress",
+					"memlimit-mt-decompress%", optarg,
+					false, false, true);
+			break;
+
+		// --memlimit
+		case 'M':
+			parse_memlimit("memlimit", "memlimit%", optarg,
+					true, true, true);
+			break;
+
+		// --suffix
+		case 'S':
+			suffix_set(optarg);
+			break;
+
+		case 'T': {
+			// Since xz 5.4.0: Ignore leading '+' first.
+			const char *s = optarg;
+			if (optarg[0] == '+')
+				++s;
+
+			// The max is from src/liblzma/common/common.h.
+			uint32_t t = str_to_uint64("threads", s, 0, 16384);
+
+			// If leading '+' was used then use multi-threaded
+			// mode even if exactly one thread was specified.
+			if (t == 1 && optarg[0] == '+')
+				t = UINT32_MAX;
+
+			hardware_threads_set(t);
+			break;
+		}
+
+		// --version
+		case 'V':
+			// This doesn't return.
+			message_version();
+
+		// --stdout
+		case 'c':
+			opt_stdout = true;
+			break;
+
+		// --decompress
+		case 'd':
+			opt_mode = MODE_DECOMPRESS;
+			break;
+
+		// --extreme
+		case 'e':
+			coder_set_extreme();
+			break;
+
+		// --force
+		case 'f':
+			opt_force = true;
+			break;
+
+		// --info-memory
+		case OPT_INFO_MEMORY:
+			// This doesn't return.
+			hardware_memlimit_show();
+
+		// --help
+		case 'h':
+			// This doesn't return.
+			message_help(false);
+
+		// --long-help
+		case 'H':
+			// This doesn't return.
+			message_help(true);
+
+		// --list
+		case 'l':
+			opt_mode = MODE_LIST;
+			break;
+
+		// --keep
+		case 'k':
+			opt_keep_original = true;
+			break;
+
+		// --quiet
+		case 'q':
+			message_verbosity_decrease();
+			break;
+
+		case 'Q':
+			set_exit_no_warn();
+			break;
+
+		case 't':
+			opt_mode = MODE_TEST;
+			break;
+
+		// --verbose
+		case 'v':
+			message_verbosity_increase();
+			break;
+
+		// --robot
+		case OPT_ROBOT:
+			opt_robot = true;
+
+			// This is to make sure that floating point numbers
+			// always have a dot as decimal separator.
+			setlocale(LC_NUMERIC, "C");
+			break;
+
+		case 'z':
+			opt_mode = MODE_COMPRESS;
+			break;
+
+		// Filter setup
+
+		case OPT_X86:
+			coder_add_filter(LZMA_FILTER_X86,
+					options_bcj(optarg));
+			break;
+
+		case OPT_POWERPC:
+			coder_add_filter(LZMA_FILTER_POWERPC,
+					options_bcj(optarg));
+			break;
+
+		case OPT_IA64:
+			coder_add_filter(LZMA_FILTER_IA64,
+					options_bcj(optarg));
+			break;
+
+		case OPT_ARM:
+			coder_add_filter(LZMA_FILTER_ARM,
+					options_bcj(optarg));
+			break;
+
+		case OPT_ARMTHUMB:
+			coder_add_filter(LZMA_FILTER_ARMTHUMB,
+					options_bcj(optarg));
+			break;
+
+		case OPT_ARM64:
+			coder_add_filter(LZMA_FILTER_ARM64,
+					options_bcj(optarg));
+			break;
+
+		case OPT_SPARC:
+			coder_add_filter(LZMA_FILTER_SPARC,
+					options_bcj(optarg));
+			break;
+
+		case OPT_DELTA:
+			coder_add_filter(LZMA_FILTER_DELTA,
+					options_delta(optarg));
+			break;
+
+		case OPT_LZMA1:
+			coder_add_filter(LZMA_FILTER_LZMA1,
+					options_lzma(optarg));
+			break;
+
+		case OPT_LZMA2:
+			coder_add_filter(LZMA_FILTER_LZMA2,
+					options_lzma(optarg));
+			break;
+
+		// Other
+
+		// --format
+		case 'F': {
+			// Just in case, support both "lzma" and "alone" since
+			// the latter was used for forward compatibility in
+			// LZMA Utils 4.32.x.
+			static const struct {
+				char str[8];
+				enum format_type format;
+			} types[] = {
+				{ "auto",   FORMAT_AUTO },
+				{ "xz",     FORMAT_XZ },
+				{ "lzma",   FORMAT_LZMA },
+				{ "alone",  FORMAT_LZMA },
+#ifdef HAVE_LZIP_DECODER
+				{ "lzip",   FORMAT_LZIP },
+#endif
+				{ "raw",    FORMAT_RAW },
+			};
+
+			size_t i = 0;
+			while (strcmp(types[i].str, optarg) != 0)
+				if (++i == ARRAY_SIZE(types))
+					message_fatal(_("%s: Unknown file "
+							"format type"),
+							optarg);
+
+			opt_format = types[i].format;
+			break;
+		}
+
+		// --check
+		case 'C': {
+			static const struct {
+				char str[8];
+				lzma_check check;
+			} types[] = {
+				{ "none",   LZMA_CHECK_NONE },
+				{ "crc32",  LZMA_CHECK_CRC32 },
+				{ "crc64",  LZMA_CHECK_CRC64 },
+				{ "sha256", LZMA_CHECK_SHA256 },
+			};
+
+			size_t i = 0;
+			while (strcmp(types[i].str, optarg) != 0) {
+				if (++i == ARRAY_SIZE(types))
+					message_fatal(_("%s: Unsupported "
+							"integrity "
+							"check type"), optarg);
+			}
+
+			// Use a separate check in case we are using different
+			// liblzma than what was used to compile us.
+			if (!lzma_check_is_supported(types[i].check))
+				message_fatal(_("%s: Unsupported integrity "
+						"check type"), optarg);
+
+			coder_set_check(types[i].check);
+			break;
+		}
+
+		case OPT_IGNORE_CHECK:
+			opt_ignore_check = true;
+			break;
+
+		case OPT_BLOCK_SIZE:
+			opt_block_size = str_to_uint64("block-size", optarg,
+					0, LZMA_VLI_MAX);
+			break;
+
+		case OPT_BLOCK_LIST: {
+			parse_block_list(optarg);
+			break;
+		}
+
+		case OPT_SINGLE_STREAM:
+			opt_single_stream = true;
+			break;
+
+		case OPT_NO_SPARSE:
+			io_no_sparse();
+			break;
+
+		case OPT_FILES:
+			args->files_delim = '\n';
+
+		// Fall through
+
+		case OPT_FILES0:
+			if (args->files_name != NULL)
+				message_fatal(_("Only one file can be "
+						"specified with `--files' "
+						"or `--files0'."));
+
+			if (optarg == NULL) {
+				args->files_name = stdin_filename;
+				args->files_file = stdin;
+			} else {
+				args->files_name = optarg;
+				args->files_file = fopen(optarg,
+						c == OPT_FILES ? "r" : "rb");
+				if (args->files_file == NULL)
+					message_fatal("%s: %s", optarg,
+							strerror(errno));
+			}
+
+			break;
+
+		case OPT_NO_ADJUST:
+			opt_auto_adjust = false;
+			break;
+
+		case OPT_FLUSH_TIMEOUT:
+			opt_flush_timeout = str_to_uint64("flush-timeout",
+					optarg, 0, UINT64_MAX);
+			break;
+
+		default:
+			message_try_help();
+			tuklib_exit(E_ERROR, E_ERROR, false);
+		}
+	}
+
+	return;
+}
+
+
+static void
+parse_environment(args_info *args, char *argv0, const char *varname)
+{
+	char *env = getenv(varname);
+	if (env == NULL)
+		return;
+
+	// We modify the string, so make a copy of it.
+	env = xstrdup(env);
+
+	// Calculate the number of arguments in env. argc stats at one
+	// to include space for the program name.
+	int argc = 1;
+	bool prev_was_space = true;
+	for (size_t i = 0; env[i] != '\0'; ++i) {
+		// NOTE: Cast to unsigned char is needed so that correct
+		// value gets passed to isspace(), which expects
+		// unsigned char cast to int. Casting to int is done
+		// automatically due to integer promotion, but we need to
+		// force char to unsigned char manually. Otherwise 8-bit
+		// characters would get promoted to wrong value if
+		// char is signed.
+		if (isspace((unsigned char)env[i])) {
+			prev_was_space = true;
+		} else if (prev_was_space) {
+			prev_was_space = false;
+
+			// Keep argc small enough to fit into a signed int
+			// and to keep it usable for memory allocation.
+			if (++argc == my_min(
+					INT_MAX, SIZE_MAX / sizeof(char *)))
+				message_fatal(_("The environment variable "
+						"%s contains too many "
+						"arguments"), varname);
+		}
+	}
+
+	// Allocate memory to hold pointers to the arguments. Add one to get
+	// space for the terminating NULL (if some systems happen to need it).
+	char **argv = xmalloc(((size_t)(argc) + 1) * sizeof(char *));
+	argv[0] = argv0;
+	argv[argc] = NULL;
+
+	// Go through the string again. Split the arguments using '\0'
+	// characters and add pointers to the resulting strings to argv.
+	argc = 1;
+	prev_was_space = true;
+	for (size_t i = 0; env[i] != '\0'; ++i) {
+		if (isspace((unsigned char)env[i])) {
+			prev_was_space = true;
+			env[i] = '\0';
+		} else if (prev_was_space) {
+			prev_was_space = false;
+			argv[argc++] = env + i;
+		}
+	}
+
+	// Parse the argument list we got from the environment. All non-option
+	// arguments i.e. filenames are ignored.
+	parse_real(args, argc, argv);
+
+	// Reset the state of the getopt_long() so that we can parse the
+	// command line options too. There are two incompatible ways to
+	// do it.
+#ifdef HAVE_OPTRESET
+	// BSD
+	optind = 1;
+	optreset = 1;
+#else
+	// GNU, Solaris
+	optind = 0;
+#endif
+
+	// We don't need the argument list from environment anymore.
+	free(argv);
+	free(env);
+
+	return;
+}
+
+
+extern void
+args_parse(args_info *args, int argc, char **argv)
+{
+	// Initialize those parts of *args that we need later.
+	args->files_name = NULL;
+	args->files_file = NULL;
+	args->files_delim = '\0';
+
+	// Check how we were called.
+	{
+		// Remove the leading path name, if any.
+		const char *name = strrchr(argv[0], '/');
+		if (name == NULL)
+			name = argv[0];
+		else
+			++name;
+
+		// NOTE: It's possible that name[0] is now '\0' if argv[0]
+		// is weird, but it doesn't matter here.
+
+		// Look for full command names instead of substrings like
+		// "un", "cat", and "lz" to reduce possibility of false
+		// positives when the programs have been renamed.
+		if (strstr(name, "xzcat") != NULL) {
+			opt_mode = MODE_DECOMPRESS;
+			opt_stdout = true;
+		} else if (strstr(name, "unxz") != NULL) {
+			opt_mode = MODE_DECOMPRESS;
+		} else if (strstr(name, "lzcat") != NULL) {
+			opt_format = FORMAT_LZMA;
+			opt_mode = MODE_DECOMPRESS;
+			opt_stdout = true;
+		} else if (strstr(name, "unlzma") != NULL) {
+			opt_format = FORMAT_LZMA;
+			opt_mode = MODE_DECOMPRESS;
+		} else if (strstr(name, "lzma") != NULL) {
+			opt_format = FORMAT_LZMA;
+		}
+	}
+
+	// First the flags from the environment
+	parse_environment(args, argv[0], "XZ_DEFAULTS");
+	parse_environment(args, argv[0], "XZ_OPT");
+
+	// Then from the command line
+	parse_real(args, argc, argv);
+
+	// If encoder or decoder support was omitted at build time,
+	// show an error now so that the rest of the code can rely on
+	// that whatever is in opt_mode is also supported.
+#ifndef HAVE_ENCODERS
+	if (opt_mode == MODE_COMPRESS)
+		message_fatal(_("Compression support was disabled "
+				"at build time"));
+#endif
+#ifndef HAVE_DECODERS
+	// Even MODE_LIST cannot work without decoder support so MODE_COMPRESS
+	// is the only valid choice.
+	if (opt_mode != MODE_COMPRESS)
+		message_fatal(_("Decompression support was disabled "
+				"at build time"));
+#endif
+
+#ifdef HAVE_LZIP_DECODER
+	if (opt_mode == MODE_COMPRESS && opt_format == FORMAT_LZIP)
+		message_fatal(_("Compression of lzip files (.lz) "
+				"is not supported"));
+#endif
+
+	// Never remove the source file when the destination is not on disk.
+	// In test mode the data is written nowhere, but setting opt_stdout
+	// will make the rest of the code behave well.
+	if (opt_stdout || opt_mode == MODE_TEST) {
+		opt_keep_original = true;
+		opt_stdout = true;
+	}
+
+	// When compressing, if no --format flag was used, or it
+	// was --format=auto, we compress to the .xz format.
+	if (opt_mode == MODE_COMPRESS && opt_format == FORMAT_AUTO)
+		opt_format = FORMAT_XZ;
+
+	// Compression settings need to be validated (options themselves and
+	// their memory usage) when compressing to any file format. It has to
+	// be done also when uncompressing raw data, since for raw decoding
+	// the options given on the command line are used to know what kind
+	// of raw data we are supposed to decode.
+	if (opt_mode == MODE_COMPRESS || opt_format == FORMAT_RAW)
+		coder_set_compression_settings();
+
+	// If no filenames are given, use stdin.
+	if (argv[optind] == NULL && args->files_name == NULL) {
+		// We don't modify or free() the "-" constant. The caller
+		// modifies this so don't make the struct itself const.
+		static char *names_stdin[2] = { (char *)"-", NULL };
+		args->arg_names = names_stdin;
+		args->arg_count = 1;
+	} else {
+		// We got at least one filename from the command line, or
+		// --files or --files0 was specified.
+		args->arg_names = argv + optind;
+		args->arg_count = (unsigned int)(argc - optind);
+	}
+
+	return;
+}
+
+
+#ifndef NDEBUG
+extern void
+args_free(void)
+{
+	free(opt_block_list);
+	return;
+}
+#endif
diff --git a/src/xz/args.h b/src/xz/args.h
new file mode 100644
index 0000000..a1a5930
--- /dev/null
+++ b/src/xz/args.h
@@ -0,0 +1,44 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       args.h
+/// \brief      Argument parsing
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+typedef struct {
+	/// Filenames from command line
+	char **arg_names;
+
+	/// Number of filenames from command line
+	unsigned int arg_count;
+
+	/// Name of the file from which to read filenames. This is NULL
+	/// if --files or --files0 was not used.
+	const char *files_name;
+
+	/// File opened for reading from which filenames are read. This is
+	/// non-NULL only if files_name is non-NULL.
+	FILE *files_file;
+
+	/// Delimiter for filenames read from files_file
+	char files_delim;
+
+} args_info;
+
+
+extern bool opt_stdout;
+extern bool opt_force;
+extern bool opt_keep_original;
+// extern bool opt_recursive;
+extern bool opt_robot;
+extern bool opt_ignore_check;
+
+extern const char stdin_filename[];
+
+extern void args_parse(args_info *args, int argc, char **argv);
+extern void args_free(void);
diff --git a/src/xz/coder.c b/src/xz/coder.c
new file mode 100644
index 0000000..05f2288
--- /dev/null
+++ b/src/xz/coder.c
@@ -0,0 +1,1108 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       coder.c
+/// \brief      Compresses or uncompresses a file
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+
+
+/// Return value type for coder_init().
+enum coder_init_ret {
+	CODER_INIT_NORMAL,
+	CODER_INIT_PASSTHRU,
+	CODER_INIT_ERROR,
+};
+
+
+enum operation_mode opt_mode = MODE_COMPRESS;
+enum format_type opt_format = FORMAT_AUTO;
+bool opt_auto_adjust = true;
+bool opt_single_stream = false;
+uint64_t opt_block_size = 0;
+uint64_t *opt_block_list = NULL;
+
+
+/// Stream used to communicate with liblzma
+static lzma_stream strm = LZMA_STREAM_INIT;
+
+/// Filters needed for all encoding all formats, and also decoding in raw data
+static lzma_filter filters[LZMA_FILTERS_MAX + 1];
+
+/// Input and output buffers
+static io_buf in_buf;
+static io_buf out_buf;
+
+/// Number of filters. Zero indicates that we are using a preset.
+static uint32_t filters_count = 0;
+
+/// Number of the preset (0-9)
+static uint32_t preset_number = LZMA_PRESET_DEFAULT;
+
+/// Integrity check type
+static lzma_check check;
+
+/// This becomes false if the --check=CHECK option is used.
+static bool check_default = true;
+
+/// Indicates if unconsumed input is allowed to remain after
+/// decoding has successfully finished. This is set for each file
+/// in coder_init().
+static bool allow_trailing_input;
+
+#ifdef MYTHREAD_ENABLED
+static lzma_mt mt_options = {
+	.flags = 0,
+	.timeout = 300,
+	.filters = filters,
+};
+#endif
+
+
+extern void
+coder_set_check(lzma_check new_check)
+{
+	check = new_check;
+	check_default = false;
+	return;
+}
+
+
+static void
+forget_filter_chain(void)
+{
+	// Setting a preset makes us forget a possibly defined custom
+	// filter chain.
+	while (filters_count > 0) {
+		--filters_count;
+		free(filters[filters_count].options);
+		filters[filters_count].options = NULL;
+	}
+
+	return;
+}
+
+
+extern void
+coder_set_preset(uint32_t new_preset)
+{
+	preset_number &= ~LZMA_PRESET_LEVEL_MASK;
+	preset_number |= new_preset;
+	forget_filter_chain();
+	return;
+}
+
+
+extern void
+coder_set_extreme(void)
+{
+	preset_number |= LZMA_PRESET_EXTREME;
+	forget_filter_chain();
+	return;
+}
+
+
+extern void
+coder_add_filter(lzma_vli id, void *options)
+{
+	if (filters_count == LZMA_FILTERS_MAX)
+		message_fatal(_("Maximum number of filters is four"));
+
+	filters[filters_count].id = id;
+	filters[filters_count].options = options;
+	++filters_count;
+
+	// Setting a custom filter chain makes us forget the preset options.
+	// This makes a difference if one specifies e.g. "xz -9 --lzma2 -e"
+	// where the custom filter chain resets the preset level back to
+	// the default 6, making the example equivalent to "xz -6e".
+	preset_number = LZMA_PRESET_DEFAULT;
+
+	return;
+}
+
+
+static void lzma_attribute((__noreturn__))
+memlimit_too_small(uint64_t memory_usage)
+{
+	message(V_ERROR, _("Memory usage limit is too low for the given "
+			"filter setup."));
+	message_mem_needed(V_ERROR, memory_usage);
+	tuklib_exit(E_ERROR, E_ERROR, false);
+}
+
+
+extern void
+coder_set_compression_settings(void)
+{
+#ifdef HAVE_LZIP_DECODER
+	// .lz compression isn't supported.
+	assert(opt_format != FORMAT_LZIP);
+#endif
+
+	// The default check type is CRC64, but fallback to CRC32
+	// if CRC64 isn't supported by the copy of liblzma we are
+	// using. CRC32 is always supported.
+	if (check_default) {
+		check = LZMA_CHECK_CRC64;
+		if (!lzma_check_is_supported(check))
+			check = LZMA_CHECK_CRC32;
+	}
+
+	// Options for LZMA1 or LZMA2 in case we are using a preset.
+	static lzma_options_lzma opt_lzma;
+
+	if (filters_count == 0) {
+		// We are using a preset. This is not a good idea in raw mode
+		// except when playing around with things. Different versions
+		// of this software may use different options in presets, and
+		// thus make uncompressing the raw data difficult.
+		if (opt_format == FORMAT_RAW) {
+			// The message is shown only if warnings are allowed
+			// but the exit status isn't changed.
+			message(V_WARNING, _("Using a preset in raw mode "
+					"is discouraged."));
+			message(V_WARNING, _("The exact options of the "
+					"presets may vary between software "
+					"versions."));
+		}
+
+		// Get the preset for LZMA1 or LZMA2.
+		if (lzma_lzma_preset(&opt_lzma, preset_number))
+			message_bug();
+
+		// Use LZMA2 except with --format=lzma we use LZMA1.
+		filters[0].id = opt_format == FORMAT_LZMA
+				? LZMA_FILTER_LZMA1 : LZMA_FILTER_LZMA2;
+		filters[0].options = &opt_lzma;
+		filters_count = 1;
+	}
+
+	// Terminate the filter options array.
+	filters[filters_count].id = LZMA_VLI_UNKNOWN;
+
+	// If we are using the .lzma format, allow exactly one filter
+	// which has to be LZMA1.
+	if (opt_format == FORMAT_LZMA && (filters_count != 1
+			|| filters[0].id != LZMA_FILTER_LZMA1))
+		message_fatal(_("The .lzma format supports only "
+				"the LZMA1 filter"));
+
+	// If we are using the .xz format, make sure that there is no LZMA1
+	// filter to prevent LZMA_PROG_ERROR.
+	if (opt_format == FORMAT_XZ)
+		for (size_t i = 0; i < filters_count; ++i)
+			if (filters[i].id == LZMA_FILTER_LZMA1)
+				message_fatal(_("LZMA1 cannot be used "
+						"with the .xz format"));
+
+	// Print the selected filter chain.
+	message_filters_show(V_DEBUG, filters);
+
+	// The --flush-timeout option requires LZMA_SYNC_FLUSH support
+	// from the filter chain. Currently threaded encoder doesn't support
+	// LZMA_SYNC_FLUSH so single-threaded mode must be used.
+	if (opt_mode == MODE_COMPRESS && opt_flush_timeout != 0) {
+		for (size_t i = 0; i < filters_count; ++i) {
+			switch (filters[i].id) {
+			case LZMA_FILTER_LZMA2:
+			case LZMA_FILTER_DELTA:
+				break;
+
+			default:
+				message_fatal(_("The filter chain is "
+					"incompatible with --flush-timeout"));
+			}
+		}
+
+		if (hardware_threads_is_mt()) {
+			message(V_WARNING, _("Switching to single-threaded "
+					"mode due to --flush-timeout"));
+			hardware_threads_set(1);
+		}
+	}
+
+	// Get the memory usage. Note that if --format=raw was used,
+	// we can be decompressing.
+	//
+	// If multithreaded .xz compression is done, this value will be
+	// replaced.
+	uint64_t memory_limit = hardware_memlimit_get(opt_mode);
+	uint64_t memory_usage = UINT64_MAX;
+	if (opt_mode == MODE_COMPRESS) {
+#ifdef HAVE_ENCODERS
+#	ifdef MYTHREAD_ENABLED
+		if (opt_format == FORMAT_XZ && hardware_threads_is_mt()) {
+			memory_limit = hardware_memlimit_mtenc_get();
+			mt_options.threads = hardware_threads_get();
+			mt_options.block_size = opt_block_size;
+			mt_options.check = check;
+			memory_usage = lzma_stream_encoder_mt_memusage(
+					&mt_options);
+			if (memory_usage != UINT64_MAX)
+				message(V_DEBUG, _("Using up to %" PRIu32
+						" threads."),
+						mt_options.threads);
+		} else
+#	endif
+		{
+			memory_usage = lzma_raw_encoder_memusage(filters);
+		}
+#endif
+	} else {
+#ifdef HAVE_DECODERS
+		memory_usage = lzma_raw_decoder_memusage(filters);
+#endif
+	}
+
+	if (memory_usage == UINT64_MAX)
+		message_fatal(_("Unsupported filter chain or filter options"));
+
+	// Print memory usage info before possible dictionary
+	// size auto-adjusting.
+	//
+	// NOTE: If only encoder support was built, we cannot show the
+	// what the decoder memory usage will be.
+	message_mem_needed(V_DEBUG, memory_usage);
+#ifdef HAVE_DECODERS
+	if (opt_mode == MODE_COMPRESS) {
+		const uint64_t decmem = lzma_raw_decoder_memusage(filters);
+		if (decmem != UINT64_MAX)
+			message(V_DEBUG, _("Decompression will need "
+					"%s MiB of memory."), uint64_to_str(
+						round_up_to_mib(decmem), 0));
+	}
+#endif
+
+	if (memory_usage <= memory_limit)
+		return;
+
+	// With --format=raw settings are never adjusted to meet
+	// the memory usage limit.
+	if (opt_format == FORMAT_RAW)
+		memlimit_too_small(memory_usage);
+
+	assert(opt_mode == MODE_COMPRESS);
+
+#ifdef HAVE_ENCODERS
+#	ifdef MYTHREAD_ENABLED
+	if (opt_format == FORMAT_XZ && hardware_threads_is_mt()) {
+		// Try to reduce the number of threads before
+		// adjusting the compression settings down.
+		while (mt_options.threads > 1) {
+			// Reduce the number of threads by one and check
+			// the memory usage.
+			--mt_options.threads;
+			memory_usage = lzma_stream_encoder_mt_memusage(
+					&mt_options);
+			if (memory_usage == UINT64_MAX)
+				message_bug();
+
+			if (memory_usage <= memory_limit) {
+				// The memory usage is now low enough.
+				message(V_WARNING, _("Reduced the number of "
+					"threads from %s to %s to not exceed "
+					"the memory usage limit of %s MiB"),
+					uint64_to_str(
+						hardware_threads_get(), 0),
+					uint64_to_str(mt_options.threads, 1),
+					uint64_to_str(round_up_to_mib(
+						memory_limit), 2));
+				return;
+			}
+		}
+
+		// If the memory usage limit is only a soft limit (automatic
+		// number of threads and no --memlimit-compress), the limit
+		// is only used to reduce the number of threads and once at
+		// just one thread, the limit is completely ignored. This
+		// way -T0 won't use insane amount of memory but at the same
+		// time the soft limit will never make xz fail and never make
+		// xz change settings that would affect the compressed output.
+		if (hardware_memlimit_mtenc_is_default()) {
+			message(V_WARNING, _("Reduced the number of threads "
+				"from %s to one. The automatic memory usage "
+				"limit of %s MiB is still being exceeded. "
+				"%s MiB of memory is required. "
+				"Continuing anyway."),
+				uint64_to_str(hardware_threads_get(), 0),
+				uint64_to_str(
+					round_up_to_mib(memory_limit), 1),
+				uint64_to_str(
+					round_up_to_mib(memory_usage), 2));
+			return;
+		}
+
+		// If --no-adjust was used, we cannot drop to single-threaded
+		// mode since it produces different compressed output.
+		//
+		// NOTE: In xz 5.2.x, --no-adjust also prevented reducing
+		// the number of threads. This changed in 5.3.3alpha.
+		if (!opt_auto_adjust)
+			memlimit_too_small(memory_usage);
+
+		// Switch to single-threaded mode. It uses
+		// less memory than using one thread in
+		// the multithreaded mode but the output
+		// is also different.
+		hardware_threads_set(1);
+		memory_usage = lzma_raw_encoder_memusage(filters);
+		message(V_WARNING, _("Switching to single-threaded mode "
+			"to not exceed the memory usage limit of %s MiB"),
+			uint64_to_str(round_up_to_mib(memory_limit), 0));
+	}
+#	endif
+
+	if (memory_usage <= memory_limit)
+		return;
+
+	// Don't adjust LZMA2 or LZMA1 dictionary size if --no-adjust
+	// was specified as that would change the compressed output.
+	if (!opt_auto_adjust)
+		memlimit_too_small(memory_usage);
+
+	// Look for the last filter if it is LZMA2 or LZMA1, so we can make
+	// it use less RAM. With other filters we don't know what to do.
+	size_t i = 0;
+	while (filters[i].id != LZMA_FILTER_LZMA2
+			&& filters[i].id != LZMA_FILTER_LZMA1) {
+		if (filters[i].id == LZMA_VLI_UNKNOWN)
+			memlimit_too_small(memory_usage);
+
+		++i;
+	}
+
+	// Decrease the dictionary size until we meet the memory
+	// usage limit. First round down to full mebibytes.
+	lzma_options_lzma *opt = filters[i].options;
+	const uint32_t orig_dict_size = opt->dict_size;
+	opt->dict_size &= ~((UINT32_C(1) << 20) - 1);
+	while (true) {
+		// If it is below 1 MiB, auto-adjusting failed. We could be
+		// more sophisticated and scale it down even more, but let's
+		// see if many complain about this version.
+		//
+		// FIXME: Displays the scaled memory usage instead
+		// of the original.
+		if (opt->dict_size < (UINT32_C(1) << 20))
+			memlimit_too_small(memory_usage);
+
+		memory_usage = lzma_raw_encoder_memusage(filters);
+		if (memory_usage == UINT64_MAX)
+			message_bug();
+
+		// Accept it if it is low enough.
+		if (memory_usage <= memory_limit)
+			break;
+
+		// Otherwise 1 MiB down and try again. I hope this
+		// isn't too slow method for cases where the original
+		// dict_size is very big.
+		opt->dict_size -= UINT32_C(1) << 20;
+	}
+
+	// Tell the user that we decreased the dictionary size.
+	message(V_WARNING, _("Adjusted LZMA%c dictionary size "
+			"from %s MiB to %s MiB to not exceed "
+			"the memory usage limit of %s MiB"),
+			filters[i].id == LZMA_FILTER_LZMA2
+				? '2' : '1',
+			uint64_to_str(orig_dict_size >> 20, 0),
+			uint64_to_str(opt->dict_size >> 20, 1),
+			uint64_to_str(round_up_to_mib(memory_limit), 2));
+#endif
+
+	return;
+}
+
+
+#ifdef HAVE_DECODERS
+/// Return true if the data in in_buf seems to be in the .xz format.
+static bool
+is_format_xz(void)
+{
+	// Specify the magic as hex to be compatible with EBCDIC systems.
+	static const uint8_t magic[6] = { 0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00 };
+	return strm.avail_in >= sizeof(magic)
+			&& memcmp(in_buf.u8, magic, sizeof(magic)) == 0;
+}
+
+
+/// Return true if the data in in_buf seems to be in the .lzma format.
+static bool
+is_format_lzma(void)
+{
+	// The .lzma header is 13 bytes.
+	if (strm.avail_in < 13)
+		return false;
+
+	// Decode the LZMA1 properties.
+	lzma_filter filter = { .id = LZMA_FILTER_LZMA1 };
+	if (lzma_properties_decode(&filter, NULL, in_buf.u8, 5) != LZMA_OK)
+		return false;
+
+	// A hack to ditch tons of false positives: We allow only dictionary
+	// sizes that are 2^n or 2^n + 2^(n-1) or UINT32_MAX. LZMA_Alone
+	// created only files with 2^n, but accepts any dictionary size.
+	// If someone complains, this will be reconsidered.
+	lzma_options_lzma *opt = filter.options;
+	const uint32_t dict_size = opt->dict_size;
+	free(opt);
+
+	if (dict_size != UINT32_MAX) {
+		uint32_t d = dict_size - 1;
+		d |= d >> 2;
+		d |= d >> 3;
+		d |= d >> 4;
+		d |= d >> 8;
+		d |= d >> 16;
+		++d;
+		if (d != dict_size || dict_size == 0)
+			return false;
+	}
+
+	// Another hack to ditch false positives: Assume that if the
+	// uncompressed size is known, it must be less than 256 GiB.
+	// Again, if someone complains, this will be reconsidered.
+	uint64_t uncompressed_size = 0;
+	for (size_t i = 0; i < 8; ++i)
+		uncompressed_size |= (uint64_t)(in_buf.u8[5 + i]) << (i * 8);
+
+	if (uncompressed_size != UINT64_MAX
+			&& uncompressed_size > (UINT64_C(1) << 38))
+		return false;
+
+	return true;
+}
+
+
+#ifdef HAVE_LZIP_DECODER
+/// Return true if the data in in_buf seems to be in the .lz format.
+static bool
+is_format_lzip(void)
+{
+	static const uint8_t magic[4] = { 0x4C, 0x5A, 0x49, 0x50 };
+	return strm.avail_in >= sizeof(magic)
+			&& memcmp(in_buf.u8, magic, sizeof(magic)) == 0;
+}
+#endif
+#endif
+
+
+/// Detect the input file type (for now, this done only when decompressing),
+/// and initialize an appropriate coder. Return value indicates if a normal
+/// liblzma-based coder was initialized (CODER_INIT_NORMAL), if passthru
+/// mode should be used (CODER_INIT_PASSTHRU), or if an error occurred
+/// (CODER_INIT_ERROR).
+static enum coder_init_ret
+coder_init(file_pair *pair)
+{
+	lzma_ret ret = LZMA_PROG_ERROR;
+
+	// In most cases if there is input left when coding finishes,
+	// something has gone wrong. Exceptions are --single-stream
+	// and decoding .lz files which can contain trailing non-.lz data.
+	// These will be handled later in this function.
+	allow_trailing_input = false;
+
+	if (opt_mode == MODE_COMPRESS) {
+#ifdef HAVE_ENCODERS
+		switch (opt_format) {
+		case FORMAT_AUTO:
+			// args.c ensures this.
+			assert(0);
+			break;
+
+		case FORMAT_XZ:
+#	ifdef MYTHREAD_ENABLED
+			if (hardware_threads_is_mt())
+				ret = lzma_stream_encoder_mt(
+						&strm, &mt_options);
+			else
+#	endif
+				ret = lzma_stream_encoder(
+						&strm, filters, check);
+			break;
+
+		case FORMAT_LZMA:
+			ret = lzma_alone_encoder(&strm, filters[0].options);
+			break;
+
+#	ifdef HAVE_LZIP_DECODER
+		case FORMAT_LZIP:
+			// args.c should disallow this.
+			assert(0);
+			ret = LZMA_PROG_ERROR;
+			break;
+#	endif
+
+		case FORMAT_RAW:
+			ret = lzma_raw_encoder(&strm, filters);
+			break;
+		}
+#endif
+	} else {
+#ifdef HAVE_DECODERS
+		uint32_t flags = 0;
+
+		// It seems silly to warn about unsupported check if the
+		// check won't be verified anyway due to --ignore-check.
+		if (opt_ignore_check)
+			flags |= LZMA_IGNORE_CHECK;
+		else
+			flags |= LZMA_TELL_UNSUPPORTED_CHECK;
+
+		if (opt_single_stream)
+			allow_trailing_input = true;
+		else
+			flags |= LZMA_CONCATENATED;
+
+		// We abuse FORMAT_AUTO to indicate unknown file format,
+		// for which we may consider passthru mode.
+		enum format_type init_format = FORMAT_AUTO;
+
+		switch (opt_format) {
+		case FORMAT_AUTO:
+			// .lz is checked before .lzma since .lzma detection
+			// is more complicated (no magic bytes).
+			if (is_format_xz())
+				init_format = FORMAT_XZ;
+#	ifdef HAVE_LZIP_DECODER
+			else if (is_format_lzip())
+				init_format = FORMAT_LZIP;
+#	endif
+			else if (is_format_lzma())
+				init_format = FORMAT_LZMA;
+			break;
+
+		case FORMAT_XZ:
+			if (is_format_xz())
+				init_format = FORMAT_XZ;
+			break;
+
+		case FORMAT_LZMA:
+			if (is_format_lzma())
+				init_format = FORMAT_LZMA;
+			break;
+
+#	ifdef HAVE_LZIP_DECODER
+		case FORMAT_LZIP:
+			if (is_format_lzip())
+				init_format = FORMAT_LZIP;
+			break;
+#	endif
+
+		case FORMAT_RAW:
+			init_format = FORMAT_RAW;
+			break;
+		}
+
+		switch (init_format) {
+		case FORMAT_AUTO:
+			// Unknown file format. If --decompress --stdout
+			// --force have been given, then we copy the input
+			// as is to stdout. Checking for MODE_DECOMPRESS
+			// is needed, because we don't want to do use
+			// passthru mode with --test.
+			if (opt_mode == MODE_DECOMPRESS
+					&& opt_stdout && opt_force) {
+				// These are needed for progress info.
+				strm.total_in = 0;
+				strm.total_out = 0;
+				return CODER_INIT_PASSTHRU;
+			}
+
+			ret = LZMA_FORMAT_ERROR;
+			break;
+
+		case FORMAT_XZ:
+#	ifdef MYTHREAD_ENABLED
+			mt_options.flags = flags;
+
+			mt_options.threads = hardware_threads_get();
+			mt_options.memlimit_stop
+				= hardware_memlimit_get(MODE_DECOMPRESS);
+
+			// If single-threaded mode was requested, set the
+			// memlimit for threading to zero. This forces the
+			// decoder to use single-threaded mode which matches
+			// the behavior of lzma_stream_decoder().
+			//
+			// Otherwise use the limit for threaded decompression
+			// which has a sane default (users are still free to
+			// make it insanely high though).
+			mt_options.memlimit_threading
+					= mt_options.threads == 1
+					? 0 : hardware_memlimit_mtdec_get();
+
+			ret = lzma_stream_decoder_mt(&strm, &mt_options);
+#	else
+			ret = lzma_stream_decoder(&strm,
+					hardware_memlimit_get(
+						MODE_DECOMPRESS), flags);
+#	endif
+			break;
+
+		case FORMAT_LZMA:
+			ret = lzma_alone_decoder(&strm,
+					hardware_memlimit_get(
+						MODE_DECOMPRESS));
+			break;
+
+#	ifdef HAVE_LZIP_DECODER
+		case FORMAT_LZIP:
+			allow_trailing_input = true;
+			ret = lzma_lzip_decoder(&strm,
+					hardware_memlimit_get(
+						MODE_DECOMPRESS), flags);
+			break;
+#	endif
+
+		case FORMAT_RAW:
+			// Memory usage has already been checked in
+			// coder_set_compression_settings().
+			ret = lzma_raw_decoder(&strm, filters);
+			break;
+		}
+
+		// Try to decode the headers. This will catch too low
+		// memory usage limit in case it happens in the first
+		// Block of the first Stream, which is where it very
+		// probably will happen if it is going to happen.
+		//
+		// This will also catch unsupported check type which
+		// we treat as a warning only. If there are empty
+		// concatenated Streams with unsupported check type then
+		// the message can be shown more than once here. The loop
+		// is used in case there is first a warning about
+		// unsupported check type and then the first Block
+		// would exceed the memlimit.
+		if (ret == LZMA_OK && init_format != FORMAT_RAW) {
+			strm.next_out = NULL;
+			strm.avail_out = 0;
+			while ((ret = lzma_code(&strm, LZMA_RUN))
+					== LZMA_UNSUPPORTED_CHECK)
+				message_warning("%s: %s", pair->src_name,
+						message_strm(ret));
+
+			// With --single-stream lzma_code won't wait for
+			// LZMA_FINISH and thus it can return LZMA_STREAM_END
+			// if the file has no uncompressed data inside.
+			// So treat LZMA_STREAM_END as LZMA_OK here.
+			// When lzma_code() is called again in coder_normal()
+			// it will return LZMA_STREAM_END again.
+			if (ret == LZMA_STREAM_END)
+				ret = LZMA_OK;
+		}
+#endif
+	}
+
+	if (ret != LZMA_OK) {
+		message_error("%s: %s", pair->src_name, message_strm(ret));
+		if (ret == LZMA_MEMLIMIT_ERROR)
+			message_mem_needed(V_ERROR, lzma_memusage(&strm));
+
+		return CODER_INIT_ERROR;
+	}
+
+	return CODER_INIT_NORMAL;
+}
+
+
+/// Resolve conflicts between opt_block_size and opt_block_list in single
+/// threaded mode. We want to default to opt_block_list, except when it is
+/// larger than opt_block_size. If this is the case for the current Block
+/// at *list_pos, then we break into smaller Blocks. Otherwise advance
+/// to the next Block in opt_block_list, and break apart if needed.
+static void
+split_block(uint64_t *block_remaining,
+	    uint64_t *next_block_remaining,
+	    size_t *list_pos)
+{
+	if (*next_block_remaining > 0) {
+		// The Block at *list_pos has previously been split up.
+		assert(!hardware_threads_is_mt());
+		assert(opt_block_size > 0);
+		assert(opt_block_list != NULL);
+
+		if (*next_block_remaining > opt_block_size) {
+			// We have to split the current Block at *list_pos
+			// into another opt_block_size length Block.
+			*block_remaining = opt_block_size;
+		} else {
+			// This is the last remaining split Block for the
+			// Block at *list_pos.
+			*block_remaining = *next_block_remaining;
+		}
+
+		*next_block_remaining -= *block_remaining;
+
+	} else {
+		// The Block at *list_pos has been finished. Go to the next
+		// entry in the list. If the end of the list has been reached,
+		// reuse the size of the last Block.
+		if (opt_block_list[*list_pos + 1] != 0)
+			++*list_pos;
+
+		*block_remaining = opt_block_list[*list_pos];
+
+		// If in single-threaded mode, split up the Block if needed.
+		// This is not needed in multi-threaded mode because liblzma
+		// will do this due to how threaded encoding works.
+		if (!hardware_threads_is_mt() && opt_block_size > 0
+				&& *block_remaining > opt_block_size) {
+			*next_block_remaining
+					= *block_remaining - opt_block_size;
+			*block_remaining = opt_block_size;
+		}
+	}
+}
+
+
+static bool
+coder_write_output(file_pair *pair)
+{
+	if (opt_mode != MODE_TEST) {
+		if (io_write(pair, &out_buf, IO_BUFFER_SIZE - strm.avail_out))
+			return true;
+	}
+
+	strm.next_out = out_buf.u8;
+	strm.avail_out = IO_BUFFER_SIZE;
+	return false;
+}
+
+
+/// Compress or decompress using liblzma.
+static bool
+coder_normal(file_pair *pair)
+{
+	// Encoder needs to know when we have given all the input to it.
+	// The decoders need to know it too when we are using
+	// LZMA_CONCATENATED. We need to check for src_eof here, because
+	// the first input chunk has been already read if decompressing,
+	// and that may have been the only chunk we will read.
+	lzma_action action = pair->src_eof ? LZMA_FINISH : LZMA_RUN;
+
+	lzma_ret ret;
+
+	// Assume that something goes wrong.
+	bool success = false;
+
+	// block_remaining indicates how many input bytes to encode before
+	// finishing the current .xz Block. The Block size is set with
+	// --block-size=SIZE and --block-list. They have an effect only when
+	// compressing to the .xz format. If block_remaining == UINT64_MAX,
+	// only a single block is created.
+	uint64_t block_remaining = UINT64_MAX;
+
+	// next_block_remaining for when we are in single-threaded mode and
+	// the Block in --block-list is larger than the --block-size=SIZE.
+	uint64_t next_block_remaining = 0;
+
+	// Position in opt_block_list. Unused if --block-list wasn't used.
+	size_t list_pos = 0;
+
+	// Handle --block-size for single-threaded mode and the first step
+	// of --block-list.
+	if (opt_mode == MODE_COMPRESS && opt_format == FORMAT_XZ) {
+		// --block-size doesn't do anything here in threaded mode,
+		// because the threaded encoder will take care of splitting
+		// to fixed-sized Blocks.
+		if (!hardware_threads_is_mt() && opt_block_size > 0)
+			block_remaining = opt_block_size;
+
+		// If --block-list was used, start with the first size.
+		//
+		// For threaded case, --block-size specifies how big Blocks
+		// the encoder needs to be prepared to create at maximum
+		// and --block-list will simultaneously cause new Blocks
+		// to be started at specified intervals. To keep things
+		// logical, the same is done in single-threaded mode. The
+		// output is still not identical because in single-threaded
+		// mode the size info isn't written into Block Headers.
+		if (opt_block_list != NULL) {
+			if (block_remaining < opt_block_list[list_pos]) {
+				assert(!hardware_threads_is_mt());
+				next_block_remaining = opt_block_list[list_pos]
+						- block_remaining;
+			} else {
+				block_remaining = opt_block_list[list_pos];
+			}
+		}
+	}
+
+	strm.next_out = out_buf.u8;
+	strm.avail_out = IO_BUFFER_SIZE;
+
+	while (!user_abort) {
+		// Fill the input buffer if it is empty and we aren't
+		// flushing or finishing.
+		if (strm.avail_in == 0 && action == LZMA_RUN) {
+			strm.next_in = in_buf.u8;
+			strm.avail_in = io_read(pair, &in_buf,
+					my_min(block_remaining,
+						IO_BUFFER_SIZE));
+
+			if (strm.avail_in == SIZE_MAX)
+				break;
+
+			if (pair->src_eof) {
+				action = LZMA_FINISH;
+
+			} else if (block_remaining != UINT64_MAX) {
+				// Start a new Block after every
+				// opt_block_size bytes of input.
+				block_remaining -= strm.avail_in;
+				if (block_remaining == 0)
+					action = LZMA_FULL_BARRIER;
+			}
+
+			if (action == LZMA_RUN && pair->flush_needed)
+				action = LZMA_SYNC_FLUSH;
+		}
+
+		// Let liblzma do the actual work.
+		ret = lzma_code(&strm, action);
+
+		// Write out if the output buffer became full.
+		if (strm.avail_out == 0) {
+			if (coder_write_output(pair))
+				break;
+		}
+
+		if (ret == LZMA_STREAM_END && (action == LZMA_SYNC_FLUSH
+				|| action == LZMA_FULL_BARRIER)) {
+			if (action == LZMA_SYNC_FLUSH) {
+				// Flushing completed. Write the pending data
+				// out immediately so that the reading side
+				// can decompress everything compressed so far.
+				if (coder_write_output(pair))
+					break;
+
+				// Mark that we haven't seen any new input
+				// since the previous flush.
+				pair->src_has_seen_input = false;
+				pair->flush_needed = false;
+			} else {
+				// Start a new Block after LZMA_FULL_BARRIER.
+				if (opt_block_list == NULL) {
+					assert(!hardware_threads_is_mt());
+					assert(opt_block_size > 0);
+					block_remaining = opt_block_size;
+				} else {
+					split_block(&block_remaining,
+							&next_block_remaining,
+							&list_pos);
+				}
+			}
+
+			// Start a new Block after LZMA_FULL_FLUSH or continue
+			// the same block after LZMA_SYNC_FLUSH.
+			action = LZMA_RUN;
+
+		} else if (ret != LZMA_OK) {
+			// Determine if the return value indicates that we
+			// won't continue coding. LZMA_NO_CHECK would be
+			// here too if LZMA_TELL_ANY_CHECK was used.
+			const bool stop = ret != LZMA_UNSUPPORTED_CHECK;
+
+			if (stop) {
+				// Write the remaining bytes even if something
+				// went wrong, because that way the user gets
+				// as much data as possible, which can be good
+				// when trying to get at least some useful
+				// data out of damaged files.
+				if (coder_write_output(pair))
+					break;
+			}
+
+			if (ret == LZMA_STREAM_END) {
+				if (allow_trailing_input) {
+					io_fix_src_pos(pair, strm.avail_in);
+					success = true;
+					break;
+				}
+
+				// Check that there is no trailing garbage.
+				// This is needed for LZMA_Alone and raw
+				// streams. This is *not* done with .lz files
+				// as that format specifically requires
+				// allowing trailing garbage.
+				if (strm.avail_in == 0 && !pair->src_eof) {
+					// Try reading one more byte.
+					// Hopefully we don't get any more
+					// input, and thus pair->src_eof
+					// becomes true.
+					strm.avail_in = io_read(
+							pair, &in_buf, 1);
+					if (strm.avail_in == SIZE_MAX)
+						break;
+
+					assert(strm.avail_in == 0
+							|| strm.avail_in == 1);
+				}
+
+				if (strm.avail_in == 0) {
+					assert(pair->src_eof);
+					success = true;
+					break;
+				}
+
+				// We hadn't reached the end of the file.
+				ret = LZMA_DATA_ERROR;
+				assert(stop);
+			}
+
+			// If we get here and stop is true, something went
+			// wrong and we print an error. Otherwise it's just
+			// a warning and coding can continue.
+			if (stop) {
+				message_error("%s: %s", pair->src_name,
+						message_strm(ret));
+			} else {
+				message_warning("%s: %s", pair->src_name,
+						message_strm(ret));
+
+				// When compressing, all possible errors set
+				// stop to true.
+				assert(opt_mode != MODE_COMPRESS);
+			}
+
+			if (ret == LZMA_MEMLIMIT_ERROR) {
+				// Display how much memory it would have
+				// actually needed.
+				message_mem_needed(V_ERROR,
+						lzma_memusage(&strm));
+			}
+
+			if (stop)
+				break;
+		}
+
+		// Show progress information under certain conditions.
+		message_progress_update();
+	}
+
+	return success;
+}
+
+
+/// Copy from input file to output file without processing the data in any
+/// way. This is used only when trying to decompress unrecognized files
+/// with --decompress --stdout --force, so the output is always stdout.
+static bool
+coder_passthru(file_pair *pair)
+{
+	while (strm.avail_in != 0) {
+		if (user_abort)
+			return false;
+
+		if (io_write(pair, &in_buf, strm.avail_in))
+			return false;
+
+		strm.total_in += strm.avail_in;
+		strm.total_out = strm.total_in;
+		message_progress_update();
+
+		strm.avail_in = io_read(pair, &in_buf, IO_BUFFER_SIZE);
+		if (strm.avail_in == SIZE_MAX)
+			return false;
+	}
+
+	return true;
+}
+
+
+extern void
+coder_run(const char *filename)
+{
+	// Set and possibly print the filename for the progress message.
+	message_filename(filename);
+
+	// Try to open the input file.
+	file_pair *pair = io_open_src(filename);
+	if (pair == NULL)
+		return;
+
+	// Assume that something goes wrong.
+	bool success = false;
+
+	if (opt_mode == MODE_COMPRESS) {
+		strm.next_in = NULL;
+		strm.avail_in = 0;
+	} else {
+		// Read the first chunk of input data. This is needed
+		// to detect the input file type.
+		strm.next_in = in_buf.u8;
+		strm.avail_in = io_read(pair, &in_buf, IO_BUFFER_SIZE);
+	}
+
+	if (strm.avail_in != SIZE_MAX) {
+		// Initialize the coder. This will detect the file format
+		// and, in decompression or testing mode, check the memory
+		// usage of the first Block too. This way we don't try to
+		// open the destination file if we see that coding wouldn't
+		// work at all anyway. This also avoids deleting the old
+		// "target" file if --force was used.
+		const enum coder_init_ret init_ret = coder_init(pair);
+
+		if (init_ret != CODER_INIT_ERROR && !user_abort) {
+			// Don't open the destination file when --test
+			// is used.
+			if (opt_mode == MODE_TEST || !io_open_dest(pair)) {
+				// Remember the current time. It is needed
+				// for progress indicator.
+				mytime_set_start_time();
+
+				// Initialize the progress indicator.
+				//
+				// NOTE: When reading from stdin, fstat()
+				// isn't called on it and thus src_st.st_size
+				// is zero. If stdin pointed to a regular
+				// file, it would still be possible to know
+				// the file size but then we would also need
+				// to take into account the current reading
+				// position since with stdin it isn't
+				// necessarily at the beginning of the file.
+				const bool is_passthru = init_ret
+						== CODER_INIT_PASSTHRU;
+				const uint64_t in_size
+					= pair->src_st.st_size <= 0
+					? 0 : (uint64_t)(pair->src_st.st_size);
+				message_progress_start(&strm,
+						is_passthru, in_size);
+
+				// Do the actual coding or passthru.
+				if (is_passthru)
+					success = coder_passthru(pair);
+				else
+					success = coder_normal(pair);
+
+				message_progress_end(success);
+			}
+		}
+	}
+
+	// Close the file pair. It needs to know if coding was successful to
+	// know if the source or target file should be unlinked.
+	io_close(pair, success);
+
+	return;
+}
+
+
+#ifndef NDEBUG
+extern void
+coder_free(void)
+{
+	lzma_end(&strm);
+	return;
+}
+#endif
diff --git a/src/xz/coder.h b/src/xz/coder.h
new file mode 100644
index 0000000..9e69e57
--- /dev/null
+++ b/src/xz/coder.h
@@ -0,0 +1,78 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       coder.h
+/// \brief      Compresses or uncompresses a file
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+enum operation_mode {
+	MODE_COMPRESS,
+	MODE_DECOMPRESS,
+	MODE_TEST,
+	MODE_LIST,
+};
+
+
+// NOTE: The order of these is significant in suffix.c.
+enum format_type {
+	FORMAT_AUTO,
+	FORMAT_XZ,
+	FORMAT_LZMA,
+#ifdef HAVE_LZIP_DECODER
+	FORMAT_LZIP,
+#endif
+	FORMAT_RAW,
+};
+
+
+/// Operation mode of the command line tool. This is set in args.c and read
+/// in several files.
+extern enum operation_mode opt_mode;
+
+/// File format to use when encoding or what format(s) to accept when
+/// decoding. This is a global because it's needed also in suffix.c.
+/// This is set in args.c.
+extern enum format_type opt_format;
+
+/// If true, the compression settings are automatically adjusted down if
+/// they exceed the memory usage limit.
+extern bool opt_auto_adjust;
+
+/// If true, stop after decoding the first stream.
+extern bool opt_single_stream;
+
+/// If non-zero, start a new .xz Block after every opt_block_size bytes
+/// of input. This has an effect only when compressing to the .xz format.
+extern uint64_t opt_block_size;
+
+/// This is non-NULL if --block-list was used. This contains the Block sizes
+/// as an array that is terminated with 0.
+extern uint64_t *opt_block_list;
+
+/// Set the integrity check type used when compressing
+extern void coder_set_check(lzma_check check);
+
+/// Set preset number
+extern void coder_set_preset(uint32_t new_preset);
+
+/// Enable extreme mode
+extern void coder_set_extreme(void);
+
+/// Add a filter to the custom filter chain
+extern void coder_add_filter(lzma_vli id, void *options);
+
+///
+extern void coder_set_compression_settings(void);
+
+/// Compress or decompress the given file
+extern void coder_run(const char *filename);
+
+#ifndef NDEBUG
+/// Free the memory allocated for the coder and kill the worker threads.
+extern void coder_free(void);
+#endif
diff --git a/src/xz/file_io.c b/src/xz/file_io.c
new file mode 100644
index 0000000..a5841b3
--- /dev/null
+++ b/src/xz/file_io.c
@@ -0,0 +1,1366 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       file_io.c
+/// \brief      File opening, unlinking, and closing
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+
+#include <fcntl.h>
+
+#ifdef TUKLIB_DOSLIKE
+#	include <io.h>
+#else
+#	include <poll.h>
+static bool warn_fchown;
+#endif
+
+#if defined(HAVE_FUTIMES) || defined(HAVE_FUTIMESAT) || defined(HAVE_UTIMES)
+#	include <sys/time.h>
+#elif defined(HAVE__FUTIME)
+#	include <sys/utime.h>
+#elif defined(HAVE_UTIME)
+#	include <utime.h>
+#endif
+
+#ifdef HAVE_CAPSICUM
+#	ifdef HAVE_SYS_CAPSICUM_H
+#		include <sys/capsicum.h>
+#	else
+#		include <sys/capability.h>
+#	endif
+#endif
+
+#include "tuklib_open_stdxxx.h"
+
+#ifndef O_BINARY
+#	define O_BINARY 0
+#endif
+
+#ifndef O_NOCTTY
+#	define O_NOCTTY 0
+#endif
+
+// Using this macro to silence a warning from gcc -Wlogical-op.
+#if EAGAIN == EWOULDBLOCK
+#	define IS_EAGAIN_OR_EWOULDBLOCK(e) ((e) == EAGAIN)
+#else
+#	define IS_EAGAIN_OR_EWOULDBLOCK(e) \
+		((e) == EAGAIN || (e) == EWOULDBLOCK)
+#endif
+
+
+typedef enum {
+	IO_WAIT_MORE,    // Reading or writing is possible.
+	IO_WAIT_ERROR,   // Error or user_abort
+	IO_WAIT_TIMEOUT, // poll() timed out
+} io_wait_ret;
+
+
+/// If true, try to create sparse files when decompressing.
+static bool try_sparse = true;
+
+#ifdef ENABLE_SANDBOX
+/// True if the conditions for sandboxing (described in main()) have been met.
+static bool sandbox_allowed = false;
+#endif
+
+#ifndef TUKLIB_DOSLIKE
+/// File status flags of standard input. This is used by io_open_src()
+/// and io_close_src().
+static int stdin_flags;
+static bool restore_stdin_flags = false;
+
+/// Original file status flags of standard output. This is used by
+/// io_open_dest() and io_close_dest() to save and restore the flags.
+static int stdout_flags;
+static bool restore_stdout_flags = false;
+
+/// Self-pipe used together with the user_abort variable to avoid
+/// race conditions with signal handling.
+static int user_abort_pipe[2];
+#endif
+
+
+static bool io_write_buf(file_pair *pair, const uint8_t *buf, size_t size);
+
+
+extern void
+io_init(void)
+{
+	// Make sure that stdin, stdout, and stderr are connected to
+	// a valid file descriptor. Exit immediately with exit code ERROR
+	// if we cannot make the file descriptors valid. Maybe we should
+	// print an error message, but our stderr could be screwed anyway.
+	tuklib_open_stdxxx(E_ERROR);
+
+#ifndef TUKLIB_DOSLIKE
+	// If fchown() fails setting the owner, we warn about it only if
+	// we are root.
+	warn_fchown = geteuid() == 0;
+
+	// Create a pipe for the self-pipe trick.
+	if (pipe(user_abort_pipe))
+		message_fatal(_("Error creating a pipe: %s"),
+				strerror(errno));
+
+	// Make both ends of the pipe non-blocking.
+	for (unsigned i = 0; i < 2; ++i) {
+		int flags = fcntl(user_abort_pipe[i], F_GETFL);
+		if (flags == -1 || fcntl(user_abort_pipe[i], F_SETFL,
+				flags | O_NONBLOCK) == -1)
+			message_fatal(_("Error creating a pipe: %s"),
+					strerror(errno));
+	}
+#endif
+
+#ifdef __DJGPP__
+	// Avoid doing useless things when statting files.
+	// This isn't important but doesn't hurt.
+	_djstat_flags = _STAT_EXEC_EXT | _STAT_EXEC_MAGIC | _STAT_DIRSIZE;
+#endif
+
+	return;
+}
+
+
+#ifndef TUKLIB_DOSLIKE
+extern void
+io_write_to_user_abort_pipe(void)
+{
+	// If the write() fails, it's probably due to the pipe being full.
+	// Failing in that case is fine. If the reason is something else,
+	// there's not much we can do since this is called in a signal
+	// handler. So ignore the errors and try to avoid warnings with
+	// GCC and glibc when _FORTIFY_SOURCE=2 is used.
+	uint8_t b = '\0';
+	const int ret = write(user_abort_pipe[1], &b, 1);
+	(void)ret;
+	return;
+}
+#endif
+
+
+extern void
+io_no_sparse(void)
+{
+	try_sparse = false;
+	return;
+}
+
+
+#ifdef ENABLE_SANDBOX
+extern void
+io_allow_sandbox(void)
+{
+	sandbox_allowed = true;
+	return;
+}
+
+
+/// Enables operating-system-specific sandbox if it is possible.
+/// src_fd is the file descriptor of the input file.
+static void
+io_sandbox_enter(int src_fd)
+{
+	if (!sandbox_allowed) {
+		// This message is more often annoying than useful so
+		// it's commented out. It can be useful when developing
+		// the sandboxing code.
+		//message(V_DEBUG, _("Sandbox is disabled due "
+		//		"to incompatible command line arguments"));
+		return;
+	}
+
+	const char dummy_str[] = "x";
+
+	// Try to ensure that both libc and xz locale files have been
+	// loaded when NLS is enabled.
+	snprintf(NULL, 0, "%s%s", _(dummy_str), strerror(EINVAL));
+
+	// Try to ensure that iconv data files needed for handling multibyte
+	// characters have been loaded. This is needed at least with glibc.
+	tuklib_mbstr_width(dummy_str, NULL);
+
+#ifdef HAVE_CAPSICUM
+	// Capsicum needs FreeBSD 10.0 or later.
+	cap_rights_t rights;
+
+	if (cap_rights_limit(src_fd, cap_rights_init(&rights,
+			CAP_EVENT, CAP_FCNTL, CAP_LOOKUP, CAP_READ, CAP_SEEK)))
+		goto error;
+
+	if (cap_rights_limit(STDOUT_FILENO, cap_rights_init(&rights,
+			CAP_EVENT, CAP_FCNTL, CAP_FSTAT, CAP_LOOKUP,
+			CAP_WRITE, CAP_SEEK)))
+		goto error;
+
+	if (cap_rights_limit(user_abort_pipe[0], cap_rights_init(&rights,
+			CAP_EVENT)))
+		goto error;
+
+	if (cap_rights_limit(user_abort_pipe[1], cap_rights_init(&rights,
+			CAP_WRITE)))
+		goto error;
+
+	if (cap_enter())
+		goto error;
+
+#elif defined(HAVE_PLEDGE)
+	// pledge() was introduced in OpenBSD 5.9.
+	//
+	// main() unconditionally calls pledge() with fairly relaxed
+	// promises which work in all situations. Here we make the
+	// sandbox more strict.
+	if (pledge("stdio", ""))
+		goto error;
+
+	(void)src_fd;
+
+#else
+#	error ENABLE_SANDBOX is defined but no sandboxing method was found.
+#endif
+
+	// This message is annoying in xz -lvv.
+	//message(V_DEBUG, _("Sandbox was successfully enabled"));
+	return;
+
+error:
+	message_fatal(_("Failed to enable the sandbox"));
+}
+#endif // ENABLE_SANDBOX
+
+
+#ifndef TUKLIB_DOSLIKE
+/// \brief      Waits for input or output to become available or for a signal
+///
+/// This uses the self-pipe trick to avoid a race condition that can occur
+/// if a signal is caught after user_abort has been checked but before e.g.
+/// read() has been called. In that situation read() could block unless
+/// non-blocking I/O is used. With non-blocking I/O something like select()
+/// or poll() is needed to avoid a busy-wait loop, and the same race condition
+/// pops up again. There are pselect() (POSIX-1.2001) and ppoll() (not in
+/// POSIX) but neither is portable enough in 2013. The self-pipe trick is
+/// old and very portable.
+static io_wait_ret
+io_wait(file_pair *pair, int timeout, bool is_reading)
+{
+	struct pollfd pfd[2];
+
+	if (is_reading) {
+		pfd[0].fd = pair->src_fd;
+		pfd[0].events = POLLIN;
+	} else {
+		pfd[0].fd = pair->dest_fd;
+		pfd[0].events = POLLOUT;
+	}
+
+	pfd[1].fd = user_abort_pipe[0];
+	pfd[1].events = POLLIN;
+
+	while (true) {
+		const int ret = poll(pfd, 2, timeout);
+
+		if (user_abort)
+			return IO_WAIT_ERROR;
+
+		if (ret == -1) {
+			if (errno == EINTR || errno == EAGAIN)
+				continue;
+
+			message_error(_("%s: poll() failed: %s"),
+					is_reading ? pair->src_name
+						: pair->dest_name,
+					strerror(errno));
+			return IO_WAIT_ERROR;
+		}
+
+		if (ret == 0)
+			return IO_WAIT_TIMEOUT;
+
+		if (pfd[0].revents != 0)
+			return IO_WAIT_MORE;
+	}
+}
+#endif
+
+
+/// \brief      Unlink a file
+///
+/// This tries to verify that the file being unlinked really is the file that
+/// we want to unlink by verifying device and inode numbers. There's still
+/// a small unavoidable race, but this is much better than nothing (the file
+/// could have been moved/replaced even hours earlier).
+static void
+io_unlink(const char *name, const struct stat *known_st)
+{
+#if defined(TUKLIB_DOSLIKE)
+	// On DOS-like systems, st_ino is meaningless, so don't bother
+	// testing it. Just silence a compiler warning.
+	(void)known_st;
+#else
+	struct stat new_st;
+
+	// If --force was used, use stat() instead of lstat(). This way
+	// (de)compressing symlinks works correctly. However, it also means
+	// that xz cannot detect if a regular file foo is renamed to bar
+	// and then a symlink foo -> bar is created. Because of stat()
+	// instead of lstat(), xz will think that foo hasn't been replaced
+	// with another file. Thus, xz will remove foo even though it no
+	// longer is the same file that xz used when it started compressing.
+	// Probably it's not too bad though, so this doesn't need a more
+	// complex fix.
+	const int stat_ret = opt_force
+			? stat(name, &new_st) : lstat(name, &new_st);
+
+	if (stat_ret
+#	ifdef __VMS
+			// st_ino is an array, and we don't want to
+			// compare st_dev at all.
+			|| memcmp(&new_st.st_ino, &known_st->st_ino,
+				sizeof(new_st.st_ino)) != 0
+#	else
+			// Typical POSIX-like system
+			|| new_st.st_dev != known_st->st_dev
+			|| new_st.st_ino != known_st->st_ino
+#	endif
+			)
+		// TRANSLATORS: When compression or decompression finishes,
+		// and xz is going to remove the source file, xz first checks
+		// if the source file still exists, and if it does, does its
+		// device and inode numbers match what xz saw when it opened
+		// the source file. If these checks fail, this message is
+		// shown, %s being the filename, and the file is not deleted.
+		// The check for device and inode numbers is there, because
+		// it is possible that the user has put a new file in place
+		// of the original file, and in that case it obviously
+		// shouldn't be removed.
+		message_warning(_("%s: File seems to have been moved, "
+				"not removing"), name);
+	else
+#endif
+		// There's a race condition between lstat() and unlink()
+		// but at least we have tried to avoid removing wrong file.
+		if (unlink(name))
+			message_warning(_("%s: Cannot remove: %s"),
+					name, strerror(errno));
+
+	return;
+}
+
+
+/// \brief      Copies owner/group and permissions
+///
+/// \todo       ACL and EA support
+///
+static void
+io_copy_attrs(const file_pair *pair)
+{
+	// Skip chown and chmod on Windows.
+#ifndef TUKLIB_DOSLIKE
+	// This function is more tricky than you may think at first.
+	// Blindly copying permissions may permit users to access the
+	// destination file who didn't have permission to access the
+	// source file.
+
+	// Try changing the owner of the file. If we aren't root or the owner
+	// isn't already us, fchown() probably doesn't succeed. We warn
+	// about failing fchown() only if we are root.
+	if (fchown(pair->dest_fd, pair->src_st.st_uid, (gid_t)(-1))
+			&& warn_fchown)
+		message_warning(_("%s: Cannot set the file owner: %s"),
+				pair->dest_name, strerror(errno));
+
+	mode_t mode;
+
+	// With BSD semantics the new dest file may have a group that
+	// does not belong to the user. If the src file has the same gid
+	// nothing has to be done. Nevertheless OpenBSD fchown(2) fails
+	// in this case which seems to be POSIX compliant. As there is
+	// nothing to do, skip the system call.
+	if (pair->dest_st.st_gid != pair->src_st.st_gid
+			&& fchown(pair->dest_fd, (uid_t)(-1),
+				pair->src_st.st_gid)) {
+		message_warning(_("%s: Cannot set the file group: %s"),
+				pair->dest_name, strerror(errno));
+		// We can still safely copy some additional permissions:
+		// `group' must be at least as strict as `other' and
+		// also vice versa.
+		//
+		// NOTE: After this, the owner of the source file may
+		// get additional permissions. This shouldn't be too bad,
+		// because the owner would have had permission to chmod
+		// the original file anyway.
+		mode = ((pair->src_st.st_mode & 0070) >> 3)
+				& (pair->src_st.st_mode & 0007);
+		mode = (pair->src_st.st_mode & 0700) | (mode << 3) | mode;
+	} else {
+		// Drop the setuid, setgid, and sticky bits.
+		mode = pair->src_st.st_mode & 0777;
+	}
+
+	if (fchmod(pair->dest_fd, mode))
+		message_warning(_("%s: Cannot set the file permissions: %s"),
+				pair->dest_name, strerror(errno));
+#endif
+
+	// Copy the timestamps. We have several possible ways to do this, of
+	// which some are better in both security and precision.
+	//
+	// First, get the nanosecond part of the timestamps. As of writing,
+	// it's not standardized by POSIX, and there are several names for
+	// the same thing in struct stat.
+	long atime_nsec;
+	long mtime_nsec;
+
+#	if defined(HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC)
+	// GNU and Solaris
+	atime_nsec = pair->src_st.st_atim.tv_nsec;
+	mtime_nsec = pair->src_st.st_mtim.tv_nsec;
+
+#	elif defined(HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC)
+	// BSD
+	atime_nsec = pair->src_st.st_atimespec.tv_nsec;
+	mtime_nsec = pair->src_st.st_mtimespec.tv_nsec;
+
+#	elif defined(HAVE_STRUCT_STAT_ST_ATIMENSEC)
+	// GNU and BSD without extensions
+	atime_nsec = pair->src_st.st_atimensec;
+	mtime_nsec = pair->src_st.st_mtimensec;
+
+#	elif defined(HAVE_STRUCT_STAT_ST_UATIME)
+	// Tru64
+	atime_nsec = pair->src_st.st_uatime * 1000;
+	mtime_nsec = pair->src_st.st_umtime * 1000;
+
+#	elif defined(HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC)
+	// UnixWare
+	atime_nsec = pair->src_st.st_atim.st__tim.tv_nsec;
+	mtime_nsec = pair->src_st.st_mtim.st__tim.tv_nsec;
+
+#	else
+	// Safe fallback
+	atime_nsec = 0;
+	mtime_nsec = 0;
+#	endif
+
+	// Construct a structure to hold the timestamps and call appropriate
+	// function to set the timestamps.
+#if defined(HAVE_FUTIMENS)
+	// Use nanosecond precision.
+	struct timespec tv[2];
+	tv[0].tv_sec = pair->src_st.st_atime;
+	tv[0].tv_nsec = atime_nsec;
+	tv[1].tv_sec = pair->src_st.st_mtime;
+	tv[1].tv_nsec = mtime_nsec;
+
+	(void)futimens(pair->dest_fd, tv);
+
+#elif defined(HAVE_FUTIMES) || defined(HAVE_FUTIMESAT) || defined(HAVE_UTIMES)
+	// Use microsecond precision.
+	struct timeval tv[2];
+	tv[0].tv_sec = pair->src_st.st_atime;
+	tv[0].tv_usec = atime_nsec / 1000;
+	tv[1].tv_sec = pair->src_st.st_mtime;
+	tv[1].tv_usec = mtime_nsec / 1000;
+
+#	if defined(HAVE_FUTIMES)
+	(void)futimes(pair->dest_fd, tv);
+#	elif defined(HAVE_FUTIMESAT)
+	(void)futimesat(pair->dest_fd, NULL, tv);
+#	else
+	// Argh, no function to use a file descriptor to set the timestamp.
+	(void)utimes(pair->dest_name, tv);
+#	endif
+
+#elif defined(HAVE__FUTIME)
+	// Use one-second precision with Windows-specific _futime().
+	// We could use utime() too except that for some reason the
+	// timestamp will get reset at close(). With _futime() it works.
+	// This struct cannot be const as _futime() takes a non-const pointer.
+	struct _utimbuf buf = {
+		.actime = pair->src_st.st_atime,
+		.modtime = pair->src_st.st_mtime,
+	};
+
+	// Avoid warnings.
+	(void)atime_nsec;
+	(void)mtime_nsec;
+
+	(void)_futime(pair->dest_fd, &buf);
+
+#elif defined(HAVE_UTIME)
+	// Use one-second precision. utime() doesn't support using file
+	// descriptor either. Some systems have broken utime() prototype
+	// so don't make this const.
+	struct utimbuf buf = {
+		.actime = pair->src_st.st_atime,
+		.modtime = pair->src_st.st_mtime,
+	};
+
+	// Avoid warnings.
+	(void)atime_nsec;
+	(void)mtime_nsec;
+
+	(void)utime(pair->dest_name, &buf);
+#endif
+
+	return;
+}
+
+
+/// Opens the source file. Returns false on success, true on error.
+static bool
+io_open_src_real(file_pair *pair)
+{
+	// There's nothing to open when reading from stdin.
+	if (pair->src_name == stdin_filename) {
+		pair->src_fd = STDIN_FILENO;
+#ifdef TUKLIB_DOSLIKE
+		setmode(STDIN_FILENO, O_BINARY);
+#else
+		// Try to set stdin to non-blocking mode. It won't work
+		// e.g. on OpenBSD if stdout is e.g. /dev/null. In such
+		// case we proceed as if stdin were non-blocking anyway
+		// (in case of /dev/null it will be in practice). The
+		// same applies to stdout in io_open_dest_real().
+		stdin_flags = fcntl(STDIN_FILENO, F_GETFL);
+		if (stdin_flags == -1) {
+			message_error(_("Error getting the file status flags "
+					"from standard input: %s"),
+					strerror(errno));
+			return true;
+		}
+
+		if ((stdin_flags & O_NONBLOCK) == 0
+				&& fcntl(STDIN_FILENO, F_SETFL,
+					stdin_flags | O_NONBLOCK) != -1)
+			restore_stdin_flags = true;
+#endif
+#ifdef HAVE_POSIX_FADVISE
+		// It will fail if stdin is a pipe and that's fine.
+		(void)posix_fadvise(STDIN_FILENO, 0, 0,
+				opt_mode == MODE_LIST
+					? POSIX_FADV_RANDOM
+					: POSIX_FADV_SEQUENTIAL);
+#endif
+		return false;
+	}
+
+	// Symlinks are not followed unless writing to stdout or --force
+	// or --keep was used.
+	const bool follow_symlinks
+			= opt_stdout || opt_force || opt_keep_original;
+
+	// We accept only regular files if we are writing the output
+	// to disk too. bzip2 allows overriding this with --force but
+	// gzip and xz don't.
+	const bool reg_files_only = !opt_stdout;
+
+	// Flags for open()
+	int flags = O_RDONLY | O_BINARY | O_NOCTTY;
+
+#ifndef TUKLIB_DOSLIKE
+	// Use non-blocking I/O:
+	//   - It prevents blocking when opening FIFOs and some other
+	//     special files, which is good if we want to accept only
+	//     regular files.
+	//   - It can help avoiding some race conditions with signal handling.
+	flags |= O_NONBLOCK;
+#endif
+
+#if defined(O_NOFOLLOW)
+	if (!follow_symlinks)
+		flags |= O_NOFOLLOW;
+#elif !defined(TUKLIB_DOSLIKE)
+	// Some POSIX-like systems lack O_NOFOLLOW (it's not required
+	// by POSIX). Check for symlinks with a separate lstat() on
+	// these systems.
+	if (!follow_symlinks) {
+		struct stat st;
+		if (lstat(pair->src_name, &st)) {
+			message_error("%s: %s", pair->src_name,
+					strerror(errno));
+			return true;
+
+		} else if (S_ISLNK(st.st_mode)) {
+			message_warning(_("%s: Is a symbolic link, "
+					"skipping"), pair->src_name);
+			return true;
+		}
+	}
+#else
+	// Avoid warnings.
+	(void)follow_symlinks;
+#endif
+
+	// Try to open the file. Signals have been blocked so EINTR shouldn't
+	// be possible.
+	pair->src_fd = open(pair->src_name, flags);
+
+	if (pair->src_fd == -1) {
+		// Signals (that have a signal handler) have been blocked.
+		assert(errno != EINTR);
+
+#ifdef O_NOFOLLOW
+		// Give an understandable error message if the reason
+		// for failing was that the file was a symbolic link.
+		//
+		// Note that at least Linux, OpenBSD, Solaris, and Darwin
+		// use ELOOP to indicate that O_NOFOLLOW was the reason
+		// that open() failed. Because there may be
+		// directories in the pathname, ELOOP may occur also
+		// because of a symlink loop in the directory part.
+		// So ELOOP doesn't tell us what actually went wrong,
+		// and this stupidity went into POSIX-1.2008 too.
+		//
+		// FreeBSD associates EMLINK with O_NOFOLLOW and
+		// Tru64 uses ENOTSUP. We use these directly here
+		// and skip the lstat() call and the associated race.
+		// I want to hear if there are other kernels that
+		// fail with something else than ELOOP with O_NOFOLLOW.
+		bool was_symlink = false;
+
+#	if defined(__FreeBSD__) || defined(__DragonFly__)
+		if (errno == EMLINK)
+			was_symlink = true;
+
+#	elif defined(__digital__) && defined(__unix__)
+		if (errno == ENOTSUP)
+			was_symlink = true;
+
+#	elif defined(__NetBSD__)
+		if (errno == EFTYPE)
+			was_symlink = true;
+
+#	else
+		if (errno == ELOOP && !follow_symlinks) {
+			const int saved_errno = errno;
+			struct stat st;
+			if (lstat(pair->src_name, &st) == 0
+					&& S_ISLNK(st.st_mode))
+				was_symlink = true;
+
+			errno = saved_errno;
+		}
+#	endif
+
+		if (was_symlink)
+			message_warning(_("%s: Is a symbolic link, "
+					"skipping"), pair->src_name);
+		else
+#endif
+			// Something else than O_NOFOLLOW failing
+			// (assuming that the race conditions didn't
+			// confuse us).
+			message_error("%s: %s", pair->src_name,
+					strerror(errno));
+
+		return true;
+	}
+
+	// Stat the source file. We need the result also when we copy
+	// the permissions, and when unlinking.
+	//
+	// NOTE: Use stat() instead of fstat() with DJGPP, because
+	// then we have a better chance to get st_ino value that can
+	// be used in io_open_dest_real() to prevent overwriting the
+	// source file.
+#ifdef __DJGPP__
+	if (stat(pair->src_name, &pair->src_st))
+		goto error_msg;
+#else
+	if (fstat(pair->src_fd, &pair->src_st))
+		goto error_msg;
+#endif
+
+	if (S_ISDIR(pair->src_st.st_mode)) {
+		message_warning(_("%s: Is a directory, skipping"),
+				pair->src_name);
+		goto error;
+	}
+
+	if (reg_files_only && !S_ISREG(pair->src_st.st_mode)) {
+		message_warning(_("%s: Not a regular file, skipping"),
+				pair->src_name);
+		goto error;
+	}
+
+#ifndef TUKLIB_DOSLIKE
+	if (reg_files_only && !opt_force && !opt_keep_original) {
+		if (pair->src_st.st_mode & (S_ISUID | S_ISGID)) {
+			// gzip rejects setuid and setgid files even
+			// when --force was used. bzip2 doesn't check
+			// for them, but calls fchown() after fchmod(),
+			// and many systems automatically drop setuid
+			// and setgid bits there.
+			//
+			// We accept setuid and setgid files if
+			// --force or --keep was used. We drop these bits
+			// explicitly in io_copy_attr().
+			message_warning(_("%s: File has setuid or "
+					"setgid bit set, skipping"),
+					pair->src_name);
+			goto error;
+		}
+
+		if (pair->src_st.st_mode & S_ISVTX) {
+			message_warning(_("%s: File has sticky bit "
+					"set, skipping"),
+					pair->src_name);
+			goto error;
+		}
+
+		if (pair->src_st.st_nlink > 1) {
+			message_warning(_("%s: Input file has more "
+					"than one hard link, "
+					"skipping"), pair->src_name);
+			goto error;
+		}
+	}
+
+	// If it is something else than a regular file, wait until
+	// there is input available. This way reading from FIFOs
+	// will work when open() is used with O_NONBLOCK.
+	if (!S_ISREG(pair->src_st.st_mode)) {
+		signals_unblock();
+		const io_wait_ret ret = io_wait(pair, -1, true);
+		signals_block();
+
+		if (ret != IO_WAIT_MORE)
+			goto error;
+	}
+#endif
+
+#ifdef HAVE_POSIX_FADVISE
+	// It will fail with some special files like FIFOs but that is fine.
+	(void)posix_fadvise(pair->src_fd, 0, 0,
+			opt_mode == MODE_LIST
+				? POSIX_FADV_RANDOM
+				: POSIX_FADV_SEQUENTIAL);
+#endif
+
+	return false;
+
+error_msg:
+	message_error("%s: %s", pair->src_name, strerror(errno));
+error:
+	(void)close(pair->src_fd);
+	return true;
+}
+
+
+extern file_pair *
+io_open_src(const char *src_name)
+{
+	if (src_name[0] == '\0') {
+		message_error(_("Empty filename, skipping"));
+		return NULL;
+	}
+
+	// Since we have only one file open at a time, we can use
+	// a statically allocated structure.
+	static file_pair pair;
+
+	// This implicitly also initializes src_st.st_size to zero
+	// which is expected to be <= 0 by default. fstat() isn't
+	// called when reading from standard input but src_st.st_size
+	// is still read.
+	pair = (file_pair){
+		.src_name = src_name,
+		.dest_name = NULL,
+		.src_fd = -1,
+		.dest_fd = -1,
+		.src_eof = false,
+		.src_has_seen_input = false,
+		.flush_needed = false,
+		.dest_try_sparse = false,
+		.dest_pending_sparse = 0,
+	};
+
+	// Block the signals, for which we have a custom signal handler, so
+	// that we don't need to worry about EINTR.
+	signals_block();
+	const bool error = io_open_src_real(&pair);
+	signals_unblock();
+
+#ifdef ENABLE_SANDBOX
+	if (!error)
+		io_sandbox_enter(pair.src_fd);
+#endif
+
+	return error ? NULL : &pair;
+}
+
+
+/// \brief      Closes source file of the file_pair structure
+///
+/// \param      pair    File whose src_fd should be closed
+/// \param      success If true, the file will be removed from the disk if
+///                     closing succeeds and --keep hasn't been used.
+static void
+io_close_src(file_pair *pair, bool success)
+{
+#ifndef TUKLIB_DOSLIKE
+	if (restore_stdin_flags) {
+		assert(pair->src_fd == STDIN_FILENO);
+
+		restore_stdin_flags = false;
+
+		if (fcntl(STDIN_FILENO, F_SETFL, stdin_flags) == -1)
+			message_error(_("Error restoring the status flags "
+					"to standard input: %s"),
+					strerror(errno));
+	}
+#endif
+
+	if (pair->src_fd != STDIN_FILENO && pair->src_fd != -1) {
+		// Close the file before possibly unlinking it. On DOS-like
+		// systems this is always required since unlinking will fail
+		// if the file is open. On POSIX systems it usually works
+		// to unlink open files, but in some cases it doesn't and
+		// one gets EBUSY in errno.
+		//
+		// xz 5.2.2 and older unlinked the file before closing it
+		// (except on DOS-like systems). The old code didn't handle
+		// EBUSY and could fail e.g. on some CIFS shares. The
+		// advantage of unlinking before closing is negligible
+		// (avoids a race between close() and stat()/lstat() and
+		// unlink()), so let's keep this simple.
+		(void)close(pair->src_fd);
+
+		if (success && !opt_keep_original)
+			io_unlink(pair->src_name, &pair->src_st);
+	}
+
+	return;
+}
+
+
+static bool
+io_open_dest_real(file_pair *pair)
+{
+	if (opt_stdout || pair->src_fd == STDIN_FILENO) {
+		// We don't modify or free() this.
+		pair->dest_name = (char *)"(stdout)";
+		pair->dest_fd = STDOUT_FILENO;
+#ifdef TUKLIB_DOSLIKE
+		setmode(STDOUT_FILENO, O_BINARY);
+#else
+		// Try to set O_NONBLOCK if it isn't already set.
+		// If it fails, we assume that stdout is non-blocking
+		// in practice. See the comments in io_open_src_real()
+		// for similar situation with stdin.
+		//
+		// NOTE: O_APPEND may be unset later in this function
+		// and it relies on stdout_flags being set here.
+		stdout_flags = fcntl(STDOUT_FILENO, F_GETFL);
+		if (stdout_flags == -1) {
+			message_error(_("Error getting the file status flags "
+					"from standard output: %s"),
+					strerror(errno));
+			return true;
+		}
+
+		if ((stdout_flags & O_NONBLOCK) == 0
+				&& fcntl(STDOUT_FILENO, F_SETFL,
+					stdout_flags | O_NONBLOCK) != -1)
+				restore_stdout_flags = true;
+#endif
+	} else {
+		pair->dest_name = suffix_get_dest_name(pair->src_name);
+		if (pair->dest_name == NULL)
+			return true;
+
+#ifdef __DJGPP__
+		struct stat st;
+		if (stat(pair->dest_name, &st) == 0) {
+			// Check that it isn't a special file like "prn".
+			if (st.st_dev == -1) {
+				message_error("%s: Refusing to write to "
+						"a DOS special file",
+						pair->dest_name);
+				free(pair->dest_name);
+				return true;
+			}
+
+			// Check that we aren't overwriting the source file.
+			if (st.st_dev == pair->src_st.st_dev
+					&& st.st_ino == pair->src_st.st_ino) {
+				message_error("%s: Output file is the same "
+						"as the input file",
+						pair->dest_name);
+				free(pair->dest_name);
+				return true;
+			}
+		}
+#endif
+
+		// If --force was used, unlink the target file first.
+		if (opt_force && unlink(pair->dest_name) && errno != ENOENT) {
+			message_error(_("%s: Cannot remove: %s"),
+					pair->dest_name, strerror(errno));
+			free(pair->dest_name);
+			return true;
+		}
+
+		// Open the file.
+		int flags = O_WRONLY | O_BINARY | O_NOCTTY
+				| O_CREAT | O_EXCL;
+#ifndef TUKLIB_DOSLIKE
+		flags |= O_NONBLOCK;
+#endif
+		const mode_t mode = S_IRUSR | S_IWUSR;
+		pair->dest_fd = open(pair->dest_name, flags, mode);
+
+		if (pair->dest_fd == -1) {
+			message_error("%s: %s", pair->dest_name,
+					strerror(errno));
+			free(pair->dest_name);
+			return true;
+		}
+	}
+
+#ifndef TUKLIB_DOSLIKE
+	// dest_st isn't used on DOS-like systems except as a dummy
+	// argument to io_unlink(), so don't fstat() on such systems.
+	if (fstat(pair->dest_fd, &pair->dest_st)) {
+		// If fstat() really fails, we have a safe fallback here.
+#	if defined(__VMS)
+		pair->dest_st.st_ino[0] = 0;
+		pair->dest_st.st_ino[1] = 0;
+		pair->dest_st.st_ino[2] = 0;
+#	else
+		pair->dest_st.st_dev = 0;
+		pair->dest_st.st_ino = 0;
+#	endif
+	} else if (try_sparse && opt_mode == MODE_DECOMPRESS) {
+		// When writing to standard output, we need to be extra
+		// careful:
+		//  - It may be connected to something else than
+		//    a regular file.
+		//  - We aren't necessarily writing to a new empty file
+		//    or to the end of an existing file.
+		//  - O_APPEND may be active.
+		//
+		// TODO: I'm keeping this disabled for DOS-like systems
+		// for now. FAT doesn't support sparse files, but NTFS
+		// does, so maybe this should be enabled on Windows after
+		// some testing.
+		if (pair->dest_fd == STDOUT_FILENO) {
+			if (!S_ISREG(pair->dest_st.st_mode))
+				return false;
+
+			if (stdout_flags & O_APPEND) {
+				// Creating a sparse file is not possible
+				// when O_APPEND is active (it's used by
+				// shell's >> redirection). As I understand
+				// it, it is safe to temporarily disable
+				// O_APPEND in xz, because if someone
+				// happened to write to the same file at the
+				// same time, results would be bad anyway
+				// (users shouldn't assume that xz uses any
+				// specific block size when writing data).
+				//
+				// The write position may be something else
+				// than the end of the file, so we must fix
+				// it to start writing at the end of the file
+				// to imitate O_APPEND.
+				if (lseek(STDOUT_FILENO, 0, SEEK_END) == -1)
+					return false;
+
+				// Construct the new file status flags.
+				// If O_NONBLOCK was set earlier in this
+				// function, it must be kept here too.
+				int flags = stdout_flags & ~O_APPEND;
+				if (restore_stdout_flags)
+					flags |= O_NONBLOCK;
+
+				// If this fcntl() fails, we continue but won't
+				// try to create sparse output. The original
+				// flags will still be restored if needed (to
+				// unset O_NONBLOCK) when the file is finished.
+				if (fcntl(STDOUT_FILENO, F_SETFL, flags) == -1)
+					return false;
+
+				// Disabling O_APPEND succeeded. Mark
+				// that the flags should be restored
+				// in io_close_dest(). (This may have already
+				// been set when enabling O_NONBLOCK.)
+				restore_stdout_flags = true;
+
+			} else if (lseek(STDOUT_FILENO, 0, SEEK_CUR)
+					!= pair->dest_st.st_size) {
+				// Writing won't start exactly at the end
+				// of the file. We cannot use sparse output,
+				// because it would probably corrupt the file.
+				return false;
+			}
+		}
+
+		pair->dest_try_sparse = true;
+	}
+#endif
+
+	return false;
+}
+
+
+extern bool
+io_open_dest(file_pair *pair)
+{
+	signals_block();
+	const bool ret = io_open_dest_real(pair);
+	signals_unblock();
+	return ret;
+}
+
+
+/// \brief      Closes destination file of the file_pair structure
+///
+/// \param      pair    File whose dest_fd should be closed
+/// \param      success If false, the file will be removed from the disk.
+///
+/// \return     Zero if closing succeeds. On error, -1 is returned and
+///             error message printed.
+static bool
+io_close_dest(file_pair *pair, bool success)
+{
+#ifndef TUKLIB_DOSLIKE
+	// If io_open_dest() has disabled O_APPEND, restore it here.
+	if (restore_stdout_flags) {
+		assert(pair->dest_fd == STDOUT_FILENO);
+
+		restore_stdout_flags = false;
+
+		if (fcntl(STDOUT_FILENO, F_SETFL, stdout_flags) == -1) {
+			message_error(_("Error restoring the O_APPEND flag "
+					"to standard output: %s"),
+					strerror(errno));
+			return true;
+		}
+	}
+#endif
+
+	if (pair->dest_fd == -1 || pair->dest_fd == STDOUT_FILENO)
+		return false;
+
+	if (close(pair->dest_fd)) {
+		message_error(_("%s: Closing the file failed: %s"),
+				pair->dest_name, strerror(errno));
+
+		// Closing destination file failed, so we cannot trust its
+		// contents. Get rid of junk:
+		io_unlink(pair->dest_name, &pair->dest_st);
+		free(pair->dest_name);
+		return true;
+	}
+
+	// If the operation using this file wasn't successful, we git rid
+	// of the junk file.
+	if (!success)
+		io_unlink(pair->dest_name, &pair->dest_st);
+
+	free(pair->dest_name);
+
+	return false;
+}
+
+
+extern void
+io_close(file_pair *pair, bool success)
+{
+	// Take care of sparseness at the end of the output file.
+	if (success && pair->dest_try_sparse
+			&& pair->dest_pending_sparse > 0) {
+		// Seek forward one byte less than the size of the pending
+		// hole, then write one zero-byte. This way the file grows
+		// to its correct size. An alternative would be to use
+		// ftruncate() but that isn't portable enough (e.g. it
+		// doesn't work with FAT on Linux; FAT isn't that important
+		// since it doesn't support sparse files anyway, but we don't
+		// want to create corrupt files on it).
+		if (lseek(pair->dest_fd, pair->dest_pending_sparse - 1,
+				SEEK_CUR) == -1) {
+			message_error(_("%s: Seeking failed when trying "
+					"to create a sparse file: %s"),
+					pair->dest_name, strerror(errno));
+			success = false;
+		} else {
+			const uint8_t zero[1] = { '\0' };
+			if (io_write_buf(pair, zero, 1))
+				success = false;
+		}
+	}
+
+	signals_block();
+
+	// Copy the file attributes. We need to skip this if destination
+	// file isn't open or it is standard output.
+	if (success && pair->dest_fd != -1 && pair->dest_fd != STDOUT_FILENO)
+		io_copy_attrs(pair);
+
+	// Close the destination first. If it fails, we must not remove
+	// the source file!
+	if (io_close_dest(pair, success))
+		success = false;
+
+	// Close the source file, and unlink it if the operation using this
+	// file pair was successful and we haven't requested to keep the
+	// source file.
+	io_close_src(pair, success);
+
+	signals_unblock();
+
+	return;
+}
+
+
+extern void
+io_fix_src_pos(file_pair *pair, size_t rewind_size)
+{
+	assert(rewind_size <= IO_BUFFER_SIZE);
+
+	if (rewind_size > 0) {
+		// This doesn't need to work on unseekable file descriptors,
+		// so just ignore possible errors.
+		(void)lseek(pair->src_fd, -(off_t)(rewind_size), SEEK_CUR);
+	}
+
+	return;
+}
+
+
+extern size_t
+io_read(file_pair *pair, io_buf *buf, size_t size)
+{
+	// We use small buffers here.
+	assert(size < SSIZE_MAX);
+
+	size_t pos = 0;
+
+	while (pos < size) {
+		const ssize_t amount = read(
+				pair->src_fd, buf->u8 + pos, size - pos);
+
+		if (amount == 0) {
+			pair->src_eof = true;
+			break;
+		}
+
+		if (amount == -1) {
+			if (errno == EINTR) {
+				if (user_abort)
+					return SIZE_MAX;
+
+				continue;
+			}
+
+#ifndef TUKLIB_DOSLIKE
+			if (IS_EAGAIN_OR_EWOULDBLOCK(errno)) {
+				// Disable the flush-timeout if no input has
+				// been seen since the previous flush and thus
+				// there would be nothing to flush after the
+				// timeout expires (avoids busy waiting).
+				const int timeout = pair->src_has_seen_input
+						? mytime_get_flush_timeout()
+						: -1;
+
+				switch (io_wait(pair, timeout, true)) {
+				case IO_WAIT_MORE:
+					continue;
+
+				case IO_WAIT_ERROR:
+					return SIZE_MAX;
+
+				case IO_WAIT_TIMEOUT:
+					pair->flush_needed = true;
+					return pos;
+
+				default:
+					message_bug();
+				}
+			}
+#endif
+
+			message_error(_("%s: Read error: %s"),
+					pair->src_name, strerror(errno));
+
+			return SIZE_MAX;
+		}
+
+		pos += (size_t)(amount);
+
+		if (!pair->src_has_seen_input) {
+			pair->src_has_seen_input = true;
+			mytime_set_flush_time();
+		}
+	}
+
+	return pos;
+}
+
+
+extern bool
+io_seek_src(file_pair *pair, uint64_t pos)
+{
+	// Caller must not attempt to seek past the end of the input file
+	// (seeking to 100 in a 100-byte file is seeking to the end of
+	// the file, not past the end of the file, and thus that is allowed).
+	//
+	// This also validates that pos can be safely cast to off_t.
+	if (pos > (uint64_t)(pair->src_st.st_size))
+		message_bug();
+
+	if (lseek(pair->src_fd, (off_t)(pos), SEEK_SET) == -1) {
+		message_error(_("%s: Error seeking the file: %s"),
+				pair->src_name, strerror(errno));
+		return true;
+	}
+
+	pair->src_eof = false;
+
+	return false;
+}
+
+
+extern bool
+io_pread(file_pair *pair, io_buf *buf, size_t size, uint64_t pos)
+{
+	// Using lseek() and read() is more portable than pread() and
+	// for us it is as good as real pread().
+	if (io_seek_src(pair, pos))
+		return true;
+
+	const size_t amount = io_read(pair, buf, size);
+	if (amount == SIZE_MAX)
+		return true;
+
+	if (amount != size) {
+		message_error(_("%s: Unexpected end of file"),
+				pair->src_name);
+		return true;
+	}
+
+	return false;
+}
+
+
+static bool
+is_sparse(const io_buf *buf)
+{
+	assert(IO_BUFFER_SIZE % sizeof(uint64_t) == 0);
+
+	for (size_t i = 0; i < ARRAY_SIZE(buf->u64); ++i)
+		if (buf->u64[i] != 0)
+			return false;
+
+	return true;
+}
+
+
+static bool
+io_write_buf(file_pair *pair, const uint8_t *buf, size_t size)
+{
+	assert(size < SSIZE_MAX);
+
+	while (size > 0) {
+		const ssize_t amount = write(pair->dest_fd, buf, size);
+		if (amount == -1) {
+			if (errno == EINTR) {
+				if (user_abort)
+					return true;
+
+				continue;
+			}
+
+#ifndef TUKLIB_DOSLIKE
+			if (IS_EAGAIN_OR_EWOULDBLOCK(errno)) {
+				if (io_wait(pair, -1, false) == IO_WAIT_MORE)
+					continue;
+
+				return true;
+			}
+#endif
+
+			// Handle broken pipe specially. gzip and bzip2
+			// don't print anything on SIGPIPE. In addition,
+			// gzip --quiet uses exit status 2 (warning) on
+			// broken pipe instead of whatever raise(SIGPIPE)
+			// would make it return. It is there to hide "Broken
+			// pipe" message on some old shells (probably old
+			// GNU bash).
+			//
+			// We don't do anything special with --quiet, which
+			// is what bzip2 does too. If we get SIGPIPE, we
+			// will handle it like other signals by setting
+			// user_abort, and get EPIPE here.
+			if (errno != EPIPE)
+				message_error(_("%s: Write error: %s"),
+					pair->dest_name, strerror(errno));
+
+			return true;
+		}
+
+		buf += (size_t)(amount);
+		size -= (size_t)(amount);
+	}
+
+	return false;
+}
+
+
+extern bool
+io_write(file_pair *pair, const io_buf *buf, size_t size)
+{
+	assert(size <= IO_BUFFER_SIZE);
+
+	if (pair->dest_try_sparse) {
+		// Check if the block is sparse (contains only zeros). If it
+		// sparse, we just store the amount and return. We will take
+		// care of actually skipping over the hole when we hit the
+		// next data block or close the file.
+		//
+		// Since io_close() requires that dest_pending_sparse > 0
+		// if the file ends with sparse block, we must also return
+		// if size == 0 to avoid doing the lseek().
+		if (size == IO_BUFFER_SIZE) {
+			// Even if the block was sparse, treat it as non-sparse
+			// if the pending sparse amount is large compared to
+			// the size of off_t. In practice this only matters
+			// on 32-bit systems where off_t isn't always 64 bits.
+			const off_t pending_max
+				= (off_t)(1) << (sizeof(off_t) * CHAR_BIT - 2);
+			if (is_sparse(buf) && pair->dest_pending_sparse
+					< pending_max) {
+				pair->dest_pending_sparse += (off_t)(size);
+				return false;
+			}
+		} else if (size == 0) {
+			return false;
+		}
+
+		// This is not a sparse block. If we have a pending hole,
+		// skip it now.
+		if (pair->dest_pending_sparse > 0) {
+			if (lseek(pair->dest_fd, pair->dest_pending_sparse,
+					SEEK_CUR) == -1) {
+				message_error(_("%s: Seeking failed when "
+						"trying to create a sparse "
+						"file: %s"), pair->dest_name,
+						strerror(errno));
+				return true;
+			}
+
+			pair->dest_pending_sparse = 0;
+		}
+	}
+
+	return io_write_buf(pair, buf->u8, size);
+}
diff --git a/src/xz/file_io.h b/src/xz/file_io.h
new file mode 100644
index 0000000..8a9e336
--- /dev/null
+++ b/src/xz/file_io.h
@@ -0,0 +1,179 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       file_io.h
+/// \brief      I/O types and functions
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+// Some systems have suboptimal BUFSIZ. Use a bit bigger value on them.
+// We also need that IO_BUFFER_SIZE is a multiple of 8 (sizeof(uint64_t))
+#if BUFSIZ <= 1024
+#	define IO_BUFFER_SIZE 8192
+#else
+#	define IO_BUFFER_SIZE (BUFSIZ & ~7U)
+#endif
+
+
+/// is_sparse() accesses the buffer as uint64_t for maximum speed.
+/// The u32 and u64 members must only be access through this union
+/// to avoid strict aliasing violations. Taking a pointer of u8
+/// should be fine as long as uint8_t maps to unsigned char which
+/// can alias anything.
+typedef union {
+	uint8_t u8[IO_BUFFER_SIZE];
+	uint32_t u32[IO_BUFFER_SIZE / sizeof(uint32_t)];
+	uint64_t u64[IO_BUFFER_SIZE / sizeof(uint64_t)];
+} io_buf;
+
+
+typedef struct {
+	/// Name of the source filename (as given on the command line) or
+	/// pointer to static "(stdin)" when reading from standard input.
+	const char *src_name;
+
+	/// Destination filename converted from src_name or pointer to static
+	/// "(stdout)" when writing to standard output.
+	char *dest_name;
+
+	/// File descriptor of the source file
+	int src_fd;
+
+	/// File descriptor of the target file
+	int dest_fd;
+
+	/// True once end of the source file has been detected.
+	bool src_eof;
+
+	/// For --flush-timeout: True if at least one byte has been read
+	/// since the previous flush or the start of the file.
+	bool src_has_seen_input;
+
+	/// For --flush-timeout: True when flushing is needed.
+	bool flush_needed;
+
+	/// If true, we look for long chunks of zeros and try to create
+	/// a sparse file.
+	bool dest_try_sparse;
+
+	/// This is used only if dest_try_sparse is true. This holds the
+	/// number of zero bytes we haven't written out, because we plan
+	/// to make that byte range a sparse chunk.
+	off_t dest_pending_sparse;
+
+	/// Stat of the source file.
+	struct stat src_st;
+
+	/// Stat of the destination file.
+	struct stat dest_st;
+
+} file_pair;
+
+
+/// \brief      Initialize the I/O module
+extern void io_init(void);
+
+
+#ifndef TUKLIB_DOSLIKE
+/// \brief      Write a byte to user_abort_pipe[1]
+///
+/// This is called from a signal handler.
+extern void io_write_to_user_abort_pipe(void);
+#endif
+
+
+/// \brief      Disable creation of sparse files when decompressing
+extern void io_no_sparse(void);
+
+
+#ifdef ENABLE_SANDBOX
+/// \brief      main() calls this if conditions for sandboxing have been met.
+extern void io_allow_sandbox(void);
+#endif
+
+
+/// \brief      Open the source file
+extern file_pair *io_open_src(const char *src_name);
+
+
+/// \brief      Open the destination file
+extern bool io_open_dest(file_pair *pair);
+
+
+/// \brief      Closes the file descriptors and frees possible allocated memory
+///
+/// The success argument determines if source or destination file gets
+/// unlinked:
+///  - false: The destination file is unlinked.
+///  - true: The source file is unlinked unless writing to stdout or --keep
+///    was used.
+extern void io_close(file_pair *pair, bool success);
+
+
+/// \brief      Reads from the source file to a buffer
+///
+/// \param      pair    File pair having the source file open for reading
+/// \param      buf     Destination buffer to hold the read data
+/// \param      size    Size of the buffer; assumed be smaller than SSIZE_MAX
+///
+/// \return     On success, number of bytes read is returned. On end of
+///             file zero is returned and pair->src_eof set to true.
+///             On error, SIZE_MAX is returned and error message printed.
+extern size_t io_read(file_pair *pair, io_buf *buf, size_t size);
+
+
+/// \brief      Fix the position in src_fd
+///
+/// This is used when --single-thream has been specified and decompression
+/// is successful. If the input file descriptor supports seeking, this
+/// function fixes the input position to point to the next byte after the
+/// decompressed stream.
+///
+/// \param      pair        File pair having the source file open for reading
+/// \param      rewind_size How many bytes of extra have been read i.e.
+///                         how much to seek backwards.
+extern void io_fix_src_pos(file_pair *pair, size_t rewind_size);
+
+
+/// \brief      Seek to the given absolute position in the source file
+///
+/// This calls lseek() and also clears pair->src_eof.
+///
+/// \param      pair    Seekable source file
+/// \param      pos     Offset relative to the beginning of the file,
+///                     from which the data should be read.
+///
+/// \return     On success, false is returned. On error, error message
+///             is printed and true is returned.
+extern bool io_seek_src(file_pair *pair, uint64_t pos);
+
+
+/// \brief      Read from source file from given offset to a buffer
+///
+/// This is remotely similar to standard pread(). This uses lseek() though,
+/// so the read offset is changed on each call.
+///
+/// \param      pair    Seekable source file
+/// \param      buf     Destination buffer
+/// \param      size    Amount of data to read
+/// \param      pos     Offset relative to the beginning of the file,
+///                     from which the data should be read.
+///
+/// \return     On success, false is returned. On error, error message
+///             is printed and true is returned.
+extern bool io_pread(file_pair *pair, io_buf *buf, size_t size, uint64_t pos);
+
+
+/// \brief      Writes a buffer to the destination file
+///
+/// \param      pair    File pair having the destination file open for writing
+/// \param      buf     Buffer containing the data to be written
+/// \param      size    Size of the buffer; assumed be smaller than SSIZE_MAX
+///
+/// \return     On success, zero is returned. On error, -1 is returned
+///             and error message printed.
+extern bool io_write(file_pair *pair, const io_buf *buf, size_t size);
diff --git a/src/xz/hardware.c b/src/xz/hardware.c
new file mode 100644
index 0000000..ccdc3b9
--- /dev/null
+++ b/src/xz/hardware.c
@@ -0,0 +1,338 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       hardware.c
+/// \brief      Detection of available hardware resources
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+
+
+/// Maximum number of worker threads. This can be set with
+/// the --threads=NUM command line option.
+static uint32_t threads_max = 1;
+
+/// True when the number of threads is automatically determined based
+/// on the available hardware threads.
+static bool threads_are_automatic = false;
+
+/// If true, then try to use multi-threaded mode (if memlimit allows)
+/// even if only one thread was requested explicitly (-T+1).
+static bool use_mt_mode_with_one_thread = false;
+
+/// Memory usage limit for compression
+static uint64_t memlimit_compress = 0;
+
+/// Memory usage limit for decompression
+static uint64_t memlimit_decompress = 0;
+
+/// Default memory usage for multithreaded modes:
+///
+///   - Default value for --memlimit-compress when automatic number of threads
+///     is used. However, if the limit wouldn't allow even one thread then
+///     the limit is ignored in coder.c and one thread will be used anyway.
+///     This mess is a compromise: we wish to prevent -T0 from using too
+///     many threads but we also don't want xz to give an error due to
+///     a memlimit that the user didn't explicitly set.
+///
+///   - Default value for --memlimit-mt-decompress
+///
+/// This value is caluclated in hardware_init() and cannot be changed later.
+static uint64_t memlimit_mt_default;
+
+/// Memory usage limit for multithreaded decompression. This is a soft limit:
+/// if reducing the number of threads to one isn't enough to keep memory
+/// usage below this limit, then one thread is used and this limit is ignored.
+/// memlimit_decompress is still obeyed.
+///
+/// This can be set with --memlimit-mt-decompress. The default value for
+/// this is memlimit_mt_default.
+static uint64_t memlimit_mtdec;
+
+/// Total amount of physical RAM
+static uint64_t total_ram;
+
+
+extern void
+hardware_threads_set(uint32_t n)
+{
+	// Reset these to false first and set them to true when appropriate.
+	threads_are_automatic = false;
+	use_mt_mode_with_one_thread = false;
+
+	if (n == 0) {
+		// Automatic number of threads was requested.
+		// If there is only one hardware thread, multi-threaded
+		// mode will still be used if memory limit allows.
+		threads_are_automatic = true;
+		use_mt_mode_with_one_thread = true;
+
+		// If threading support was enabled at build time,
+		// use the number of available CPU cores. Otherwise
+		// use one thread since disabling threading support
+		// omits lzma_cputhreads() from liblzma.
+#ifdef MYTHREAD_ENABLED
+		threads_max = lzma_cputhreads();
+		if (threads_max == 0)
+			threads_max = 1;
+#else
+		threads_max = 1;
+#endif
+	} else if (n == UINT32_MAX) {
+		use_mt_mode_with_one_thread = true;
+		threads_max = 1;
+	} else {
+		threads_max = n;
+	}
+
+	return;
+}
+
+
+extern uint32_t
+hardware_threads_get(void)
+{
+	return threads_max;
+}
+
+
+extern bool
+hardware_threads_is_mt(void)
+{
+#ifdef MYTHREAD_ENABLED
+	return threads_max > 1 || use_mt_mode_with_one_thread;
+#else
+	return false;
+#endif
+}
+
+
+extern void
+hardware_memlimit_set(uint64_t new_memlimit,
+		bool set_compress, bool set_decompress, bool set_mtdec,
+		bool is_percentage)
+{
+	if (is_percentage) {
+		assert(new_memlimit > 0);
+		assert(new_memlimit <= 100);
+		new_memlimit = (uint32_t)new_memlimit * total_ram / 100;
+	}
+
+	if (set_compress) {
+		memlimit_compress = new_memlimit;
+
+#if SIZE_MAX == UINT32_MAX
+		// FIXME?
+		//
+		// When running a 32-bit xz on a system with a lot of RAM and
+		// using a percentage-based memory limit, the result can be
+		// bigger than the 32-bit address space. Limiting the limit
+		// below SIZE_MAX for compression (not decompression) makes
+		// xz lower the compression settings (or number of threads)
+		// to a level that *might* work. In practice it has worked
+		// when using a 64-bit kernel that gives full 4 GiB address
+		// space to 32-bit programs. In other situations this might
+		// still be too high, like 32-bit kernels that may give much
+		// less than 4 GiB to a single application.
+		//
+		// So this is an ugly hack but I will keep it here while
+		// it does more good than bad.
+		//
+		// Use a value less than SIZE_MAX so that there's some room
+		// for the xz program and so on. Don't use 4000 MiB because
+		// it could look like someone mixed up base-2 and base-10.
+#ifdef __mips__
+		// For MIPS32, due to architectural pecularities,
+		// the limit is even lower.
+		const uint64_t limit_max = UINT64_C(2000) << 20;
+#else
+		const uint64_t limit_max = UINT64_C(4020) << 20;
+#endif
+
+		// UINT64_MAX is a special case for the string "max" so
+		// that has to be handled specially.
+		if (memlimit_compress != UINT64_MAX
+				&& memlimit_compress > limit_max)
+			memlimit_compress = limit_max;
+#endif
+	}
+
+	if (set_decompress)
+		memlimit_decompress = new_memlimit;
+
+	if (set_mtdec)
+		memlimit_mtdec = new_memlimit;
+
+	return;
+}
+
+
+extern uint64_t
+hardware_memlimit_get(enum operation_mode mode)
+{
+	// 0 is a special value that indicates the default.
+	// It disables the limit in single-threaded mode.
+	//
+	// NOTE: For multithreaded decompression, this is the hard limit
+	// (memlimit_stop). hardware_memlimit_mtdec_get() gives the
+	// soft limit (memlimit_threaded).
+	const uint64_t memlimit = mode == MODE_COMPRESS
+			? memlimit_compress : memlimit_decompress;
+	return memlimit != 0 ? memlimit : UINT64_MAX;
+}
+
+
+extern uint64_t
+hardware_memlimit_mtenc_get(void)
+{
+	return hardware_memlimit_mtenc_is_default()
+			? memlimit_mt_default
+			: hardware_memlimit_get(MODE_COMPRESS);
+}
+
+
+extern bool
+hardware_memlimit_mtenc_is_default(void)
+{
+	return memlimit_compress == 0 && threads_are_automatic;
+}
+
+
+extern uint64_t
+hardware_memlimit_mtdec_get(void)
+{
+	uint64_t m = memlimit_mtdec != 0
+			? memlimit_mtdec
+			: memlimit_mt_default;
+
+	// Cap the value to memlimit_decompress if it has been specified.
+	// This is nice for --info-memory. It wouldn't be needed for liblzma
+	// since it does this anyway.
+	if (memlimit_decompress != 0 && m > memlimit_decompress)
+		m = memlimit_decompress;
+
+	return m;
+}
+
+
+/// Helper for hardware_memlimit_show() to print one human-readable info line.
+static void
+memlimit_show(const char *str, size_t str_columns, uint64_t value)
+{
+	// Calculate the field width so that str will be padded to take
+	// str_columns on the terminal.
+	//
+	// NOTE: If the string is invalid, this will be -1. Using -1 as
+	// the field width is fine here so it's not handled specially.
+	const int fw = tuklib_mbstr_fw(str, (int)(str_columns));
+
+	// The memory usage limit is considered to be disabled if value
+	// is 0 or UINT64_MAX. This might get a bit more complex once there
+	// is threading support. See the comment in hardware_memlimit_get().
+	if (value == 0 || value == UINT64_MAX)
+		printf("  %-*s  %s\n", fw, str, _("Disabled"));
+	else
+		printf("  %-*s  %s MiB (%s B)\n", fw, str,
+				uint64_to_str(round_up_to_mib(value), 0),
+				uint64_to_str(value, 1));
+
+	return;
+}
+
+
+extern void
+hardware_memlimit_show(void)
+{
+	uint32_t cputhreads = 1;
+#ifdef MYTHREAD_ENABLED
+	cputhreads = lzma_cputhreads();
+	if (cputhreads == 0)
+		cputhreads = 1;
+#endif
+
+	if (opt_robot) {
+		printf("%" PRIu64 "\t%" PRIu64 "\t%" PRIu64 "\t%" PRIu64
+				"\t%" PRIu64 "\t%" PRIu32 "\n",
+				total_ram,
+				memlimit_compress,
+				memlimit_decompress,
+				hardware_memlimit_mtdec_get(),
+				memlimit_mt_default,
+				cputhreads);
+	} else {
+		const char *msgs[] = {
+			_("Amount of physical memory (RAM):"),
+			_("Number of processor threads:"),
+			_("Compression:"),
+			_("Decompression:"),
+			_("Multi-threaded decompression:"),
+			_("Default for -T0:"),
+		};
+
+		size_t width_max = 1;
+		for (unsigned i = 0; i < ARRAY_SIZE(msgs); ++i) {
+			size_t w = tuklib_mbstr_width(msgs[i], NULL);
+
+			// When debugging, catch invalid strings with
+			// an assertion. Otherwise fallback to 1 so
+			// that the columns just won't be aligned.
+			assert(w != (size_t)-1);
+			if (w == (size_t)-1)
+				w = 1;
+
+			if (width_max < w)
+				width_max = w;
+		}
+
+		puts(_("Hardware information:"));
+		memlimit_show(msgs[0], width_max, total_ram);
+		printf("  %-*s  %" PRIu32 "\n",
+				tuklib_mbstr_fw(msgs[1], (int)(width_max)),
+				msgs[1], cputhreads);
+
+		putchar('\n');
+		puts(_("Memory usage limits:"));
+		memlimit_show(msgs[2], width_max, memlimit_compress);
+		memlimit_show(msgs[3], width_max, memlimit_decompress);
+		memlimit_show(msgs[4], width_max,
+				hardware_memlimit_mtdec_get());
+		memlimit_show(msgs[5], width_max, memlimit_mt_default);
+	}
+
+	tuklib_exit(E_SUCCESS, E_ERROR, message_verbosity_get() != V_SILENT);
+}
+
+
+extern void
+hardware_init(void)
+{
+	// Get the amount of RAM. If we cannot determine it,
+	// use the assumption defined by the configure script.
+	total_ram = lzma_physmem();
+	if (total_ram == 0)
+		total_ram = (uint64_t)(ASSUME_RAM) * 1024 * 1024;
+
+	// FIXME? There may be better methods to determine the default value.
+	// One Linux-specific suggestion is to use MemAvailable from
+	// /proc/meminfo as the starting point.
+	memlimit_mt_default = total_ram / 4;
+
+#if SIZE_MAX == UINT32_MAX
+	// A too high value may cause 32-bit xz to run out of address space.
+	// Use a conservative maximum value here. A few typical address space
+	// sizes with Linux:
+	//   - x86-64 with 32-bit xz: 4 GiB
+	//   - x86: 3 GiB
+	//   - MIPS32: 2 GiB
+	const size_t mem_ceiling = 1400U << 20;
+	if (memlimit_mt_default > mem_ceiling)
+		memlimit_mt_default = mem_ceiling;
+#endif
+
+	return;
+}
diff --git a/src/xz/hardware.h b/src/xz/hardware.h
new file mode 100644
index 0000000..2bb3d7b
--- /dev/null
+++ b/src/xz/hardware.h
@@ -0,0 +1,74 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       hardware.h
+/// \brief      Detection of available hardware resources
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+/// Initialize some hardware-specific variables, which are needed by other
+/// hardware_* functions.
+extern void hardware_init(void);
+
+
+/// Set the maximum number of worker threads.
+/// A special value of UINT32_MAX sets one thread in multi-threaded mode.
+extern void hardware_threads_set(uint32_t threadlimit);
+
+/// Get the maximum number of worker threads.
+extern uint32_t hardware_threads_get(void);
+
+/// Returns true if multithreaded mode should be used for .xz compression.
+/// This can be true even if the number of threads is one.
+extern bool hardware_threads_is_mt(void);
+
+
+/// Set the memory usage limit. There are separate limits for compression,
+/// decompression (also includes --list), and multithreaded decompression.
+/// Any combination of these can be set with a single call to this function.
+/// Zero indicates resetting the limit back to the defaults.
+/// The limit can also be set as a percentage of installed RAM; the
+/// percentage must be in the range [1, 100].
+extern void hardware_memlimit_set(uint64_t new_memlimit,
+		bool set_compress, bool set_decompress, bool set_mtdec,
+		bool is_percentage);
+
+/// Get the current memory usage limit for compression or decompression.
+/// This is a hard limit that will not be exceeded. This is obeyed in
+/// both single-threaded and multithreaded modes.
+extern uint64_t hardware_memlimit_get(enum operation_mode mode);
+
+/// This returns a system-specific default value if all of the following
+/// conditions are true:
+///
+///   - An automatic number of threads was requested (--threads=0).
+///
+///   - --memlimit-compress wasn't used or it was reset to the default
+///     value by setting it to 0.
+///
+/// Otherwise this is identical to hardware_memlimit_get(MODE_COMPRESS).
+///
+/// The idea is to keep automatic thread count reasonable so that too
+/// high memory usage is avoided and, with 32-bit xz, running out of
+/// address space is avoided.
+extern uint64_t hardware_memlimit_mtenc_get(void);
+
+/// Returns true if the value returned by hardware_memlimit_mtenc_get() is
+/// a system-specific default value. coder.c uses this to ignore the default
+/// memlimit in case it's too small even for a single thread in multithreaded
+/// mode. This way the default limit will never make xz fail or affect the
+/// compressed output; it will only make xz reduce the number of threads.
+extern bool hardware_memlimit_mtenc_is_default(void);
+
+/// Get the current memory usage limit for multithreaded decompression.
+/// This is only used to reduce the number of threads. This limit can be
+/// exceeded if the number of threads are reduce to one. Then the value
+/// from hardware_memlimit_get() will be honored like in single-threaded mode.
+extern uint64_t hardware_memlimit_mtdec_get(void);
+
+/// Display the amount of RAM and memory usage limits and exit.
+extern void hardware_memlimit_show(void) lzma_attribute((__noreturn__));
diff --git a/src/xz/list.c b/src/xz/list.c
new file mode 100644
index 0000000..ee61aeb
--- /dev/null
+++ b/src/xz/list.c
@@ -0,0 +1,1317 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       list.c
+/// \brief      Listing information about .xz files
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+#include "tuklib_integer.h"
+
+
+/// Information about a .xz file
+typedef struct {
+	/// Combined Index of all Streams in the file
+	lzma_index *idx;
+
+	/// Total amount of Stream Padding
+	uint64_t stream_padding;
+
+	/// Highest memory usage so far
+	uint64_t memusage_max;
+
+	/// True if all Blocks so far have Compressed Size and
+	/// Uncompressed Size fields
+	bool all_have_sizes;
+
+	/// Oldest XZ Utils version that will decompress the file
+	uint32_t min_version;
+
+} xz_file_info;
+
+#define XZ_FILE_INFO_INIT { NULL, 0, 0, true, 50000002 }
+
+
+/// Information about a .xz Block
+typedef struct {
+	/// Size of the Block Header
+	uint32_t header_size;
+
+	/// A few of the Block Flags as a string
+	char flags[3];
+
+	/// Size of the Compressed Data field in the Block
+	lzma_vli compressed_size;
+
+	/// Decoder memory usage for this Block
+	uint64_t memusage;
+
+	/// The filter chain of this Block in human-readable form
+	char *filter_chain;
+
+} block_header_info;
+
+#define BLOCK_HEADER_INFO_INIT { .filter_chain = NULL }
+#define block_header_info_end(bhi) free((bhi)->filter_chain)
+
+
+/// Strings ending in a colon. These are used for lines like
+/// "  Foo:   123 MiB". These are grouped because translated strings
+/// may have different maximum string length, and we want to pad all
+/// strings so that the values are aligned nicely.
+static const char *colon_strs[] = {
+	N_("Streams:"),
+	N_("Blocks:"),
+	N_("Compressed size:"),
+	N_("Uncompressed size:"),
+	N_("Ratio:"),
+	N_("Check:"),
+	N_("Stream Padding:"),
+	N_("Memory needed:"),
+	N_("Sizes in headers:"),
+	// This won't be aligned because it's so long:
+	//N_("Minimum XZ Utils version:"),
+	N_("Number of files:"),
+};
+
+/// Enum matching the above strings.
+enum {
+	COLON_STR_STREAMS,
+	COLON_STR_BLOCKS,
+	COLON_STR_COMPRESSED_SIZE,
+	COLON_STR_UNCOMPRESSED_SIZE,
+	COLON_STR_RATIO,
+	COLON_STR_CHECK,
+	COLON_STR_STREAM_PADDING,
+	COLON_STR_MEMORY_NEEDED,
+	COLON_STR_SIZES_IN_HEADERS,
+	//COLON_STR_MINIMUM_XZ_VERSION,
+	COLON_STR_NUMBER_OF_FILES,
+};
+
+/// Field widths to use with printf to pad the strings to use the same number
+/// of columns on a terminal.
+static int colon_strs_fw[ARRAY_SIZE(colon_strs)];
+
+/// Convenience macro to get the translated string and its field width
+/// using a COLON_STR_foo enum.
+#define COLON_STR(num) colon_strs_fw[num], _(colon_strs[num])
+
+
+/// Column headings
+static struct {
+	/// Table column heading string
+	const char *str;
+
+	/// Number of terminal-columns to use for this table-column.
+	/// If a translated string is longer than the initial value,
+	/// this value will be increased in init_headings().
+	int columns;
+
+	/// Field width to use for printf() to pad "str" to use "columns"
+	/// number of columns on a terminal. This is calculated in
+	/// init_headings().
+	int fw;
+
+} headings[] = {
+	{ N_("Stream"), 6, 0 },
+	{ N_("Block"), 9, 0 },
+	{ N_("Blocks"), 9, 0 },
+	{ N_("CompOffset"), 15, 0 },
+	{ N_("UncompOffset"), 15, 0 },
+	{ N_("CompSize"), 15, 0 },
+	{ N_("UncompSize"), 15, 0 },
+	{ N_("TotalSize"), 15, 0 },
+	{ N_("Ratio"), 5, 0 },
+	{ N_("Check"), 10, 0 },
+	{ N_("CheckVal"), 1, 0 },
+	{ N_("Padding"), 7, 0 },
+	{ N_("Header"), 5, 0 },
+	{ N_("Flags"), 2, 0 },
+	{ N_("MemUsage"), 7 + 4, 0 }, // +4 is for " MiB"
+	{ N_("Filters"), 1, 0 },
+};
+
+/// Enum matching the above strings.
+enum {
+	HEADING_STREAM,
+	HEADING_BLOCK,
+	HEADING_BLOCKS,
+	HEADING_COMPOFFSET,
+	HEADING_UNCOMPOFFSET,
+	HEADING_COMPSIZE,
+	HEADING_UNCOMPSIZE,
+	HEADING_TOTALSIZE,
+	HEADING_RATIO,
+	HEADING_CHECK,
+	HEADING_CHECKVAL,
+	HEADING_PADDING,
+	HEADING_HEADERSIZE,
+	HEADING_HEADERFLAGS,
+	HEADING_MEMUSAGE,
+	HEADING_FILTERS,
+};
+
+#define HEADING_STR(num) headings[num].fw, _(headings[num].str)
+
+
+/// Check ID to string mapping
+static const char check_names[LZMA_CHECK_ID_MAX + 1][12] = {
+	// TRANSLATORS: Indicates that there is no integrity check.
+	// This string is used in tables. In older xz version this
+	// string was limited to ten columns in a fixed-width font, but
+	// nowadays there is no strict length restriction anymore.
+	N_("None"),
+	"CRC32",
+	// TRANSLATORS: Indicates that integrity check name is not known,
+	// but the Check ID is known (here 2). In older xz version these
+	// strings were limited to ten columns in a fixed-width font, but
+	// nowadays there is no strict length restriction anymore.
+	N_("Unknown-2"),
+	N_("Unknown-3"),
+	"CRC64",
+	N_("Unknown-5"),
+	N_("Unknown-6"),
+	N_("Unknown-7"),
+	N_("Unknown-8"),
+	N_("Unknown-9"),
+	"SHA-256",
+	N_("Unknown-11"),
+	N_("Unknown-12"),
+	N_("Unknown-13"),
+	N_("Unknown-14"),
+	N_("Unknown-15"),
+};
+
+/// Buffer size for get_check_names(). This may be a bit ridiculous,
+/// but at least it's enough if some language needs many multibyte chars.
+#define CHECKS_STR_SIZE 1024
+
+
+/// Value of the Check field as hexadecimal string.
+/// This is set by parse_check_value().
+static char check_value[2 * LZMA_CHECK_SIZE_MAX + 1];
+
+
+/// Totals that are displayed if there was more than one file.
+/// The "files" counter is also used in print_info_adv() to show
+/// the file number.
+static struct {
+	uint64_t files;
+	uint64_t streams;
+	uint64_t blocks;
+	uint64_t compressed_size;
+	uint64_t uncompressed_size;
+	uint64_t stream_padding;
+	uint64_t memusage_max;
+	uint32_t checks;
+	uint32_t min_version;
+	bool all_have_sizes;
+} totals = { 0, 0, 0, 0, 0, 0, 0, 0, 50000002, true };
+
+
+/// Initialize colon_strs_fw[].
+static void
+init_colon_strs(void)
+{
+	// Lengths of translated strings as bytes.
+	size_t lens[ARRAY_SIZE(colon_strs)];
+
+	// Lengths of translated strings as columns.
+	size_t widths[ARRAY_SIZE(colon_strs)];
+
+	// Maximum number of columns needed by a translated string.
+	size_t width_max = 0;
+
+	for (unsigned i = 0; i < ARRAY_SIZE(colon_strs); ++i) {
+		widths[i] = tuklib_mbstr_width(_(colon_strs[i]), &lens[i]);
+
+		// If debugging is enabled, catch invalid strings with
+		// an assertion. However, when not debugging, use the
+		// byte count as the fallback width. This shouldn't
+		// ever happen unless there is a bad string in the
+		// translations, but in such case I guess it's better
+		// to try to print something useful instead of failing
+		// completely.
+		assert(widths[i] != (size_t)-1);
+		if (widths[i] == (size_t)-1)
+			widths[i] = lens[i];
+
+		if (widths[i] > width_max)
+			width_max = widths[i];
+	}
+
+	// Calculate the field width for printf("%*s") so that the strings
+	// will use width_max columns on a terminal.
+	for (unsigned i = 0; i < ARRAY_SIZE(colon_strs); ++i)
+		colon_strs_fw[i] = (int)(lens[i] + width_max - widths[i]);
+
+	return;
+}
+
+
+/// Initialize headings[].
+static void
+init_headings(void)
+{
+	// Before going through the heading strings themselves, treat
+	// the Check heading specially: Look at the widths of the various
+	// check names and increase the width of the Check column if needed.
+	// The width of the heading name "Check" will then be handled normally
+	// with other heading names in the second loop in this function.
+	for (unsigned i = 0; i < ARRAY_SIZE(check_names); ++i) {
+		size_t len;
+		size_t w = tuklib_mbstr_width(_(check_names[i]), &len);
+
+		// Error handling like in init_colon_strs().
+		assert(w != (size_t)-1);
+		if (w == (size_t)-1)
+			w = len;
+
+		// If the translated string is wider than the minimum width
+		// set at compile time, increase the width.
+		if ((size_t)(headings[HEADING_CHECK].columns) < w)
+			headings[HEADING_CHECK].columns = w;
+	}
+
+	for (unsigned i = 0; i < ARRAY_SIZE(headings); ++i) {
+		size_t len;
+		size_t w = tuklib_mbstr_width(_(headings[i].str), &len);
+
+		// Error handling like in init_colon_strs().
+		assert(w != (size_t)-1);
+		if (w == (size_t)-1)
+			w = len;
+
+		// If the translated string is wider than the minimum width
+		// set at compile time, increase the width.
+		if ((size_t)(headings[i].columns) < w)
+			headings[i].columns = w;
+
+		// Calculate the field width for printf("%*s") so that
+		// the string uses .columns number of columns on a terminal.
+		headings[i].fw = (int)(len + (size_t)headings[i].columns - w);
+	}
+
+	return;
+}
+
+
+/// Initialize the printf field widths that are needed to get nicely aligned
+/// output with translated strings.
+static void
+init_field_widths(void)
+{
+	init_colon_strs();
+	init_headings();
+	return;
+}
+
+
+/// Convert XZ Utils version number to a string.
+static const char *
+xz_ver_to_str(uint32_t ver)
+{
+	static char buf[32];
+
+	unsigned int major = ver / 10000000U;
+	ver -= major * 10000000U;
+
+	unsigned int minor = ver / 10000U;
+	ver -= minor * 10000U;
+
+	unsigned int patch = ver / 10U;
+	ver -= patch * 10U;
+
+	const char *stability = ver == 0 ? "alpha" : ver == 1 ? "beta" : "";
+
+	snprintf(buf, sizeof(buf), "%u.%u.%u%s",
+			major, minor, patch, stability);
+	return buf;
+}
+
+
+/// \brief      Parse the Index(es) from the given .xz file
+///
+/// \param      xfi     Pointer to structure where the decoded information
+///                     is stored.
+/// \param      pair    Input file
+///
+/// \return     On success, false is returned. On error, true is returned.
+///
+static bool
+parse_indexes(xz_file_info *xfi, file_pair *pair)
+{
+	if (pair->src_st.st_size <= 0) {
+		message_error(_("%s: File is empty"), pair->src_name);
+		return true;
+	}
+
+	if (pair->src_st.st_size < 2 * LZMA_STREAM_HEADER_SIZE) {
+		message_error(_("%s: Too small to be a valid .xz file"),
+				pair->src_name);
+		return true;
+	}
+
+	io_buf buf;
+	lzma_stream strm = LZMA_STREAM_INIT;
+	lzma_index *idx = NULL;
+
+	lzma_ret ret = lzma_file_info_decoder(&strm, &idx,
+			hardware_memlimit_get(MODE_LIST),
+			(uint64_t)(pair->src_st.st_size));
+	if (ret != LZMA_OK) {
+		message_error("%s: %s", pair->src_name, message_strm(ret));
+		return true;
+	}
+
+	while (true) {
+		if (strm.avail_in == 0) {
+			strm.next_in = buf.u8;
+			strm.avail_in = io_read(pair, &buf, IO_BUFFER_SIZE);
+			if (strm.avail_in == SIZE_MAX)
+				goto error;
+		}
+
+		ret = lzma_code(&strm, LZMA_RUN);
+
+		switch (ret) {
+		case LZMA_OK:
+			break;
+
+		case LZMA_SEEK_NEEDED:
+			// liblzma won't ask us to seek past the known size
+			// of the input file.
+			assert(strm.seek_pos
+					<= (uint64_t)(pair->src_st.st_size));
+			if (io_seek_src(pair, strm.seek_pos))
+				goto error;
+
+			// avail_in must be zero so that we will read new
+			// input.
+			strm.avail_in = 0;
+			break;
+
+		case LZMA_STREAM_END: {
+			lzma_end(&strm);
+			xfi->idx = idx;
+
+			// Calculate xfi->stream_padding.
+			lzma_index_iter iter;
+			lzma_index_iter_init(&iter, xfi->idx);
+			while (!lzma_index_iter_next(&iter,
+					LZMA_INDEX_ITER_STREAM))
+				xfi->stream_padding += iter.stream.padding;
+
+			return false;
+		}
+
+		default:
+			message_error("%s: %s", pair->src_name,
+					message_strm(ret));
+
+			// If the error was too low memory usage limit,
+			// show also how much memory would have been needed.
+			if (ret == LZMA_MEMLIMIT_ERROR)
+				message_mem_needed(V_ERROR,
+						lzma_memusage(&strm));
+
+			goto error;
+		}
+	}
+
+error:
+	lzma_end(&strm);
+	return true;
+}
+
+
+/// \brief      Parse the Block Header
+///
+/// The result is stored into *bhi. The caller takes care of initializing it.
+///
+/// \return     False on success, true on error.
+static bool
+parse_block_header(file_pair *pair, const lzma_index_iter *iter,
+		block_header_info *bhi, xz_file_info *xfi)
+{
+#if IO_BUFFER_SIZE < LZMA_BLOCK_HEADER_SIZE_MAX
+#	error IO_BUFFER_SIZE < LZMA_BLOCK_HEADER_SIZE_MAX
+#endif
+
+	// Get the whole Block Header with one read, but don't read past
+	// the end of the Block (or even its Check field).
+	const uint32_t size = my_min(iter->block.total_size
+				- lzma_check_size(iter->stream.flags->check),
+			LZMA_BLOCK_HEADER_SIZE_MAX);
+	io_buf buf;
+	if (io_pread(pair, &buf, size, iter->block.compressed_file_offset))
+		return true;
+
+	// Zero would mean Index Indicator and thus not a valid Block.
+	if (buf.u8[0] == 0)
+		goto data_error;
+
+	// Initialize the block structure and decode Block Header Size.
+	lzma_filter filters[LZMA_FILTERS_MAX + 1];
+	lzma_block block;
+	block.version = 0;
+	block.check = iter->stream.flags->check;
+	block.filters = filters;
+
+	block.header_size = lzma_block_header_size_decode(buf.u8[0]);
+	if (block.header_size > size)
+		goto data_error;
+
+	// Decode the Block Header.
+	switch (lzma_block_header_decode(&block, NULL, buf.u8)) {
+	case LZMA_OK:
+		break;
+
+	case LZMA_OPTIONS_ERROR:
+		message_error("%s: %s", pair->src_name,
+				message_strm(LZMA_OPTIONS_ERROR));
+		return true;
+
+	case LZMA_DATA_ERROR:
+		goto data_error;
+
+	default:
+		message_bug();
+	}
+
+	// Check the Block Flags. These must be done before calling
+	// lzma_block_compressed_size(), because it overwrites
+	// block.compressed_size.
+	//
+	// NOTE: If you add new characters here, update the minimum number of
+	// columns in headings[HEADING_HEADERFLAGS] to match the number of
+	// characters used here.
+	bhi->flags[0] = block.compressed_size != LZMA_VLI_UNKNOWN
+			? 'c' : '-';
+	bhi->flags[1] = block.uncompressed_size != LZMA_VLI_UNKNOWN
+			? 'u' : '-';
+	bhi->flags[2] = '\0';
+
+	// Collect information if all Blocks have both Compressed Size
+	// and Uncompressed Size fields. They can be useful e.g. for
+	// multi-threaded decompression so it can be useful to know it.
+	xfi->all_have_sizes &= block.compressed_size != LZMA_VLI_UNKNOWN
+			&& block.uncompressed_size != LZMA_VLI_UNKNOWN;
+
+	// Validate or set block.compressed_size.
+	switch (lzma_block_compressed_size(&block,
+			iter->block.unpadded_size)) {
+	case LZMA_OK:
+		// Validate also block.uncompressed_size if it is present.
+		// If it isn't present, there's no need to set it since
+		// we aren't going to actually decompress the Block; if
+		// we were decompressing, then we should set it so that
+		// the Block decoder could validate the Uncompressed Size
+		// that was stored in the Index.
+		if (block.uncompressed_size == LZMA_VLI_UNKNOWN
+				|| block.uncompressed_size
+					== iter->block.uncompressed_size)
+			break;
+
+		// If the above fails, the file is corrupt so
+		// LZMA_DATA_ERROR is a good error code.
+
+	// Fall through
+
+	case LZMA_DATA_ERROR:
+		// Free the memory allocated by lzma_block_header_decode().
+		lzma_filters_free(filters, NULL);
+		goto data_error;
+
+	default:
+		message_bug();
+	}
+
+	// Copy the known sizes.
+	bhi->header_size = block.header_size;
+	bhi->compressed_size = block.compressed_size;
+
+	// Calculate the decoder memory usage and update the maximum
+	// memory usage of this Block.
+	bhi->memusage = lzma_raw_decoder_memusage(filters);
+	if (xfi->memusage_max < bhi->memusage)
+		xfi->memusage_max = bhi->memusage;
+
+	// Determine the minimum XZ Utils version that supports this Block.
+	//
+	//   - ARM64 filter needs 5.4.0.
+	//
+	//   - 5.0.0 doesn't support empty LZMA2 streams and thus empty
+	//     Blocks that use LZMA2. This decoder bug was fixed in 5.0.2.
+	if (xfi->min_version < 50040002U) {
+		for (size_t i = 0; filters[i].id != LZMA_VLI_UNKNOWN; ++i) {
+			if (filters[i].id == LZMA_FILTER_ARM64) {
+				xfi->min_version = 50040002U;
+				break;
+			}
+		}
+	}
+
+	if (xfi->min_version < 50000022U) {
+		size_t i = 0;
+		while (filters[i + 1].id != LZMA_VLI_UNKNOWN)
+			++i;
+
+		if (filters[i].id == LZMA_FILTER_LZMA2
+				&& iter->block.uncompressed_size == 0)
+			xfi->min_version = 50000022U;
+	}
+
+	// Convert the filter chain to human readable form.
+	const lzma_ret str_ret = lzma_str_from_filters(
+			&bhi->filter_chain, filters,
+			LZMA_STR_DECODER | LZMA_STR_GETOPT_LONG, NULL);
+
+	// Free the memory allocated by lzma_block_header_decode().
+	lzma_filters_free(filters, NULL);
+
+	// Check if the stringification succeeded.
+	if (str_ret != LZMA_OK) {
+		message_error("%s: %s", pair->src_name, message_strm(str_ret));
+		return true;
+	}
+
+	return false;
+
+data_error:
+	// Show the error message.
+	message_error("%s: %s", pair->src_name,
+			message_strm(LZMA_DATA_ERROR));
+	return true;
+}
+
+
+/// \brief      Parse the Check field and put it into check_value[]
+///
+/// \return     False on success, true on error.
+static bool
+parse_check_value(file_pair *pair, const lzma_index_iter *iter)
+{
+	// Don't read anything from the file if there is no integrity Check.
+	if (iter->stream.flags->check == LZMA_CHECK_NONE) {
+		snprintf(check_value, sizeof(check_value), "---");
+		return false;
+	}
+
+	// Locate and read the Check field.
+	const uint32_t size = lzma_check_size(iter->stream.flags->check);
+	const uint64_t offset = iter->block.compressed_file_offset
+			+ iter->block.total_size - size;
+	io_buf buf;
+	if (io_pread(pair, &buf, size, offset))
+		return true;
+
+	// CRC32 and CRC64 are in little endian. Guess that all the future
+	// 32-bit and 64-bit Check values are little endian too. It shouldn't
+	// be a too big problem if this guess is wrong.
+	if (size == 4)
+		snprintf(check_value, sizeof(check_value),
+				"%08" PRIx32, conv32le(buf.u32[0]));
+	else if (size == 8)
+		snprintf(check_value, sizeof(check_value),
+				"%016" PRIx64, conv64le(buf.u64[0]));
+	else
+		for (size_t i = 0; i < size; ++i)
+			snprintf(check_value + i * 2, 3, "%02x", buf.u8[i]);
+
+	return false;
+}
+
+
+/// \brief      Parse detailed information about a Block
+///
+/// Since this requires seek(s), listing information about all Blocks can
+/// be slow.
+///
+/// \param      pair    Input file
+/// \param      iter    Location of the Block whose Check value should
+///                     be printed.
+/// \param      bhi     Pointer to structure where to store the information
+///                     about the Block Header field.
+///
+/// \return     False on success, true on error. If an error occurs,
+///             the error message is printed too so the caller doesn't
+///             need to worry about that.
+static bool
+parse_details(file_pair *pair, const lzma_index_iter *iter,
+		block_header_info *bhi, xz_file_info *xfi)
+{
+	if (parse_block_header(pair, iter, bhi, xfi))
+		return true;
+
+	if (parse_check_value(pair, iter))
+		return true;
+
+	return false;
+}
+
+
+/// \brief      Get the compression ratio
+///
+/// This has slightly different format than that is used in message.c.
+static const char *
+get_ratio(uint64_t compressed_size, uint64_t uncompressed_size)
+{
+	if (uncompressed_size == 0)
+		return "---";
+
+	const double ratio = (double)(compressed_size)
+			/ (double)(uncompressed_size);
+	if (ratio > 9.999)
+		return "---";
+
+	static char buf[16];
+	snprintf(buf, sizeof(buf), "%.3f", ratio);
+	return buf;
+}
+
+
+/// \brief      Get a comma-separated list of Check names
+///
+/// The check names are translated with gettext except when in robot mode.
+///
+/// \param      buf     Buffer to hold the resulting string
+/// \param      checks  Bit mask of Checks to print
+/// \param      space_after_comma
+///                     It's better to not use spaces in table-like listings,
+///                     but in more verbose formats a space after a comma
+///                     is good for readability.
+static void
+get_check_names(char buf[CHECKS_STR_SIZE],
+		uint32_t checks, bool space_after_comma)
+{
+	// If we get called when there are no Checks to print, set checks
+	// to 1 so that we print "None". This can happen in the robot mode
+	// when printing the totals line if there are no valid input files.
+	if (checks == 0)
+		checks = 1;
+
+	char *pos = buf;
+	size_t left = CHECKS_STR_SIZE;
+
+	const char *sep = space_after_comma ? ", " : ",";
+	bool comma = false;
+
+	for (size_t i = 0; i <= LZMA_CHECK_ID_MAX; ++i) {
+		if (checks & (UINT32_C(1) << i)) {
+			my_snprintf(&pos, &left, "%s%s",
+					comma ? sep : "",
+					opt_robot ? check_names[i]
+						: _(check_names[i]));
+			comma = true;
+		}
+	}
+
+	return;
+}
+
+
+static bool
+print_info_basic(const xz_file_info *xfi, file_pair *pair)
+{
+	static bool headings_displayed = false;
+	if (!headings_displayed) {
+		headings_displayed = true;
+		// TRANSLATORS: These are column headings. From Strms (Streams)
+		// to Ratio, the columns are right aligned. Check and Filename
+		// are left aligned. If you need longer words, it's OK to
+		// use two lines here. Test with "xz -l foo.xz".
+		puts(_("Strms  Blocks   Compressed Uncompressed  Ratio  "
+				"Check   Filename"));
+	}
+
+	char checks[CHECKS_STR_SIZE];
+	get_check_names(checks, lzma_index_checks(xfi->idx), false);
+
+	const char *cols[7] = {
+		uint64_to_str(lzma_index_stream_count(xfi->idx), 0),
+		uint64_to_str(lzma_index_block_count(xfi->idx), 1),
+		uint64_to_nicestr(lzma_index_file_size(xfi->idx),
+			NICESTR_B, NICESTR_TIB, false, 2),
+		uint64_to_nicestr(lzma_index_uncompressed_size(xfi->idx),
+			NICESTR_B, NICESTR_TIB, false, 3),
+		get_ratio(lzma_index_file_size(xfi->idx),
+			lzma_index_uncompressed_size(xfi->idx)),
+		checks,
+		pair->src_name,
+	};
+	printf("%*s %*s  %*s  %*s  %*s  %-*s %s\n",
+			tuklib_mbstr_fw(cols[0], 5), cols[0],
+			tuklib_mbstr_fw(cols[1], 7), cols[1],
+			tuklib_mbstr_fw(cols[2], 11), cols[2],
+			tuklib_mbstr_fw(cols[3], 11), cols[3],
+			tuklib_mbstr_fw(cols[4], 5), cols[4],
+			tuklib_mbstr_fw(cols[5], 7), cols[5],
+			cols[6]);
+
+	return false;
+}
+
+
+static void
+print_adv_helper(uint64_t stream_count, uint64_t block_count,
+		uint64_t compressed_size, uint64_t uncompressed_size,
+		uint32_t checks, uint64_t stream_padding)
+{
+	char checks_str[CHECKS_STR_SIZE];
+	get_check_names(checks_str, checks, true);
+
+	printf("  %-*s %s\n", COLON_STR(COLON_STR_STREAMS),
+			uint64_to_str(stream_count, 0));
+	printf("  %-*s %s\n", COLON_STR(COLON_STR_BLOCKS),
+			uint64_to_str(block_count, 0));
+	printf("  %-*s %s\n", COLON_STR(COLON_STR_COMPRESSED_SIZE),
+			uint64_to_nicestr(compressed_size,
+				NICESTR_B, NICESTR_TIB, true, 0));
+	printf("  %-*s %s\n", COLON_STR(COLON_STR_UNCOMPRESSED_SIZE),
+			uint64_to_nicestr(uncompressed_size,
+				NICESTR_B, NICESTR_TIB, true, 0));
+	printf("  %-*s %s\n", COLON_STR(COLON_STR_RATIO),
+			get_ratio(compressed_size, uncompressed_size));
+	printf("  %-*s %s\n", COLON_STR(COLON_STR_CHECK), checks_str);
+	printf("  %-*s %s\n", COLON_STR(COLON_STR_STREAM_PADDING),
+			uint64_to_nicestr(stream_padding,
+				NICESTR_B, NICESTR_TIB, true, 0));
+	return;
+}
+
+
+static bool
+print_info_adv(xz_file_info *xfi, file_pair *pair)
+{
+	// Print the overall information.
+	print_adv_helper(lzma_index_stream_count(xfi->idx),
+			lzma_index_block_count(xfi->idx),
+			lzma_index_file_size(xfi->idx),
+			lzma_index_uncompressed_size(xfi->idx),
+			lzma_index_checks(xfi->idx),
+			xfi->stream_padding);
+
+	// Size of the biggest Check. This is used to calculate the width
+	// of the CheckVal field. The table would get insanely wide if
+	// we always reserved space for 64-byte Check (128 chars as hex).
+	uint32_t check_max = 0;
+
+	// Print information about the Streams.
+	//
+	// All except Check are right aligned; Check is left aligned.
+	// Test with "xz -lv foo.xz".
+	printf("  %s\n    %*s %*s %*s %*s %*s %*s  %*s  %-*s %*s\n",
+			_(colon_strs[COLON_STR_STREAMS]),
+			HEADING_STR(HEADING_STREAM),
+			HEADING_STR(HEADING_BLOCKS),
+			HEADING_STR(HEADING_COMPOFFSET),
+			HEADING_STR(HEADING_UNCOMPOFFSET),
+			HEADING_STR(HEADING_COMPSIZE),
+			HEADING_STR(HEADING_UNCOMPSIZE),
+			HEADING_STR(HEADING_RATIO),
+			HEADING_STR(HEADING_CHECK),
+			HEADING_STR(HEADING_PADDING));
+
+	lzma_index_iter iter;
+	lzma_index_iter_init(&iter, xfi->idx);
+
+	while (!lzma_index_iter_next(&iter, LZMA_INDEX_ITER_STREAM)) {
+		const char *cols1[4] = {
+			uint64_to_str(iter.stream.number, 0),
+			uint64_to_str(iter.stream.block_count, 1),
+			uint64_to_str(iter.stream.compressed_offset, 2),
+			uint64_to_str(iter.stream.uncompressed_offset, 3),
+		};
+		printf("    %*s %*s %*s %*s ",
+			tuklib_mbstr_fw(cols1[0],
+				headings[HEADING_STREAM].columns),
+			cols1[0],
+			tuklib_mbstr_fw(cols1[1],
+				headings[HEADING_BLOCKS].columns),
+			cols1[1],
+			tuklib_mbstr_fw(cols1[2],
+				headings[HEADING_COMPOFFSET].columns),
+			cols1[2],
+			tuklib_mbstr_fw(cols1[3],
+				headings[HEADING_UNCOMPOFFSET].columns),
+			cols1[3]);
+
+		const char *cols2[5] = {
+			uint64_to_str(iter.stream.compressed_size, 0),
+			uint64_to_str(iter.stream.uncompressed_size, 1),
+			get_ratio(iter.stream.compressed_size,
+				iter.stream.uncompressed_size),
+			_(check_names[iter.stream.flags->check]),
+			uint64_to_str(iter.stream.padding, 2),
+		};
+		printf("%*s %*s  %*s  %-*s %*s\n",
+			tuklib_mbstr_fw(cols2[0],
+				headings[HEADING_COMPSIZE].columns),
+			cols2[0],
+			tuklib_mbstr_fw(cols2[1],
+				headings[HEADING_UNCOMPSIZE].columns),
+			cols2[1],
+			tuklib_mbstr_fw(cols2[2],
+				headings[HEADING_RATIO].columns),
+			cols2[2],
+			tuklib_mbstr_fw(cols2[3],
+				headings[HEADING_CHECK].columns),
+			cols2[3],
+			tuklib_mbstr_fw(cols2[4],
+				headings[HEADING_PADDING].columns),
+			cols2[4]);
+
+		// Update the maximum Check size.
+		if (lzma_check_size(iter.stream.flags->check) > check_max)
+			check_max = lzma_check_size(iter.stream.flags->check);
+	}
+
+	// Cache the verbosity level to a local variable.
+	const bool detailed = message_verbosity_get() >= V_DEBUG;
+
+	// Print information about the Blocks but only if there is
+	// at least one Block.
+	if (lzma_index_block_count(xfi->idx) > 0) {
+		// Calculate the width of the CheckVal column. This can be
+		// used as is as the field width for printf() when printing
+		// the actual check value as it is hexadecimal. However, to
+		// print the column heading, further calculation is needed
+		// to handle a translated string (it's done a few lines later).
+		assert(check_max <= LZMA_CHECK_SIZE_MAX);
+		const int checkval_width = my_max(
+				headings[HEADING_CHECKVAL].columns,
+				(int)(2 * check_max));
+
+		// All except Check are right aligned; Check is left aligned.
+		printf("  %s\n    %*s %*s %*s %*s %*s %*s  %*s  %-*s",
+				_(colon_strs[COLON_STR_BLOCKS]),
+				HEADING_STR(HEADING_STREAM),
+				HEADING_STR(HEADING_BLOCK),
+				HEADING_STR(HEADING_COMPOFFSET),
+				HEADING_STR(HEADING_UNCOMPOFFSET),
+				HEADING_STR(HEADING_TOTALSIZE),
+				HEADING_STR(HEADING_UNCOMPSIZE),
+				HEADING_STR(HEADING_RATIO),
+				detailed ? headings[HEADING_CHECK].fw : 1,
+				_(headings[HEADING_CHECK].str));
+
+		if (detailed) {
+			// CheckVal (Check value), Flags, and Filters are
+			// left aligned. Block Header Size, CompSize, and
+			// MemUsage are right aligned. Test with
+			// "xz -lvv foo.xz".
+			printf(" %-*s  %*s  %-*s %*s %*s  %s",
+				headings[HEADING_CHECKVAL].fw
+					+ checkval_width
+					- headings[HEADING_CHECKVAL].columns,
+				_(headings[HEADING_CHECKVAL].str),
+				HEADING_STR(HEADING_HEADERSIZE),
+				HEADING_STR(HEADING_HEADERFLAGS),
+				HEADING_STR(HEADING_COMPSIZE),
+				HEADING_STR(HEADING_MEMUSAGE),
+				_(headings[HEADING_FILTERS].str));
+		}
+
+		putchar('\n');
+
+		lzma_index_iter_init(&iter, xfi->idx);
+
+		// Iterate over the Blocks.
+		while (!lzma_index_iter_next(&iter, LZMA_INDEX_ITER_BLOCK)) {
+			// If in detailed mode, collect the information from
+			// Block Header before starting to print the next line.
+			block_header_info bhi = BLOCK_HEADER_INFO_INIT;
+			if (detailed && parse_details(pair, &iter, &bhi, xfi))
+				return true;
+
+			const char *cols1[4] = {
+				uint64_to_str(iter.stream.number, 0),
+				uint64_to_str(
+					iter.block.number_in_stream, 1),
+				uint64_to_str(
+					iter.block.compressed_file_offset, 2),
+				uint64_to_str(
+					iter.block.uncompressed_file_offset, 3)
+			};
+			printf("    %*s %*s %*s %*s ",
+				tuklib_mbstr_fw(cols1[0],
+					headings[HEADING_STREAM].columns),
+				cols1[0],
+				tuklib_mbstr_fw(cols1[1],
+					headings[HEADING_BLOCK].columns),
+				cols1[1],
+				tuklib_mbstr_fw(cols1[2],
+					headings[HEADING_COMPOFFSET].columns),
+				cols1[2],
+				tuklib_mbstr_fw(cols1[3], headings[
+					HEADING_UNCOMPOFFSET].columns),
+				cols1[3]);
+
+			const char *cols2[4] = {
+				uint64_to_str(iter.block.total_size, 0),
+				uint64_to_str(iter.block.uncompressed_size,
+						1),
+				get_ratio(iter.block.total_size,
+					iter.block.uncompressed_size),
+				_(check_names[iter.stream.flags->check])
+			};
+			printf("%*s %*s  %*s  %-*s",
+				tuklib_mbstr_fw(cols2[0],
+					headings[HEADING_TOTALSIZE].columns),
+				cols2[0],
+				tuklib_mbstr_fw(cols2[1],
+					headings[HEADING_UNCOMPSIZE].columns),
+				cols2[1],
+				tuklib_mbstr_fw(cols2[2],
+					headings[HEADING_RATIO].columns),
+				cols2[2],
+				tuklib_mbstr_fw(cols2[3], detailed
+					? headings[HEADING_CHECK].columns : 1),
+				cols2[3]);
+
+			if (detailed) {
+				const lzma_vli compressed_size
+						= iter.block.unpadded_size
+						- bhi.header_size
+						- lzma_check_size(
+						iter.stream.flags->check);
+
+				const char *cols3[6] = {
+					check_value,
+					uint64_to_str(bhi.header_size, 0),
+					bhi.flags,
+					uint64_to_str(compressed_size, 1),
+					uint64_to_str(
+						round_up_to_mib(bhi.memusage),
+						2),
+					bhi.filter_chain
+				};
+				// Show MiB for memory usage, because it
+				// is the only size which is not in bytes.
+				printf(" %-*s  %*s  %-*s %*s %*s MiB  %s",
+					checkval_width, cols3[0],
+					tuklib_mbstr_fw(cols3[1], headings[
+						HEADING_HEADERSIZE].columns),
+					cols3[1],
+					tuklib_mbstr_fw(cols3[2], headings[
+						HEADING_HEADERFLAGS].columns),
+					cols3[2],
+					tuklib_mbstr_fw(cols3[3], headings[
+						HEADING_COMPSIZE].columns),
+					cols3[3],
+					tuklib_mbstr_fw(cols3[4], headings[
+						HEADING_MEMUSAGE].columns - 4),
+					cols3[4],
+					cols3[5]);
+			}
+
+			putchar('\n');
+			block_header_info_end(&bhi);
+		}
+	}
+
+	if (detailed) {
+		printf("  %-*s %s MiB\n", COLON_STR(COLON_STR_MEMORY_NEEDED),
+				uint64_to_str(
+				round_up_to_mib(xfi->memusage_max), 0));
+		printf("  %-*s %s\n", COLON_STR(COLON_STR_SIZES_IN_HEADERS),
+				xfi->all_have_sizes ? _("Yes") : _("No"));
+		//printf("  %-*s %s\n", COLON_STR(COLON_STR_MINIMUM_XZ_VERSION),
+		printf(_("  Minimum XZ Utils version: %s\n"),
+				xz_ver_to_str(xfi->min_version));
+	}
+
+	return false;
+}
+
+
+static bool
+print_info_robot(xz_file_info *xfi, file_pair *pair)
+{
+	char checks[CHECKS_STR_SIZE];
+	get_check_names(checks, lzma_index_checks(xfi->idx), false);
+
+	printf("name\t%s\n", pair->src_name);
+
+	printf("file\t%" PRIu64 "\t%" PRIu64 "\t%" PRIu64 "\t%" PRIu64
+			"\t%s\t%s\t%" PRIu64 "\n",
+			lzma_index_stream_count(xfi->idx),
+			lzma_index_block_count(xfi->idx),
+			lzma_index_file_size(xfi->idx),
+			lzma_index_uncompressed_size(xfi->idx),
+			get_ratio(lzma_index_file_size(xfi->idx),
+				lzma_index_uncompressed_size(xfi->idx)),
+			checks,
+			xfi->stream_padding);
+
+	if (message_verbosity_get() >= V_VERBOSE) {
+		lzma_index_iter iter;
+		lzma_index_iter_init(&iter, xfi->idx);
+
+		while (!lzma_index_iter_next(&iter, LZMA_INDEX_ITER_STREAM))
+			printf("stream\t%" PRIu64 "\t%" PRIu64 "\t%" PRIu64
+				"\t%" PRIu64 "\t%" PRIu64 "\t%" PRIu64
+				"\t%s\t%s\t%" PRIu64 "\n",
+				iter.stream.number,
+				iter.stream.block_count,
+				iter.stream.compressed_offset,
+				iter.stream.uncompressed_offset,
+				iter.stream.compressed_size,
+				iter.stream.uncompressed_size,
+				get_ratio(iter.stream.compressed_size,
+					iter.stream.uncompressed_size),
+				check_names[iter.stream.flags->check],
+				iter.stream.padding);
+
+		lzma_index_iter_rewind(&iter);
+
+		while (!lzma_index_iter_next(&iter, LZMA_INDEX_ITER_BLOCK)) {
+			block_header_info bhi = BLOCK_HEADER_INFO_INIT;
+			if (message_verbosity_get() >= V_DEBUG
+					&& parse_details(
+						pair, &iter, &bhi, xfi))
+				return true;
+
+			printf("block\t%" PRIu64 "\t%" PRIu64 "\t%" PRIu64
+					"\t%" PRIu64 "\t%" PRIu64
+					"\t%" PRIu64 "\t%" PRIu64 "\t%s\t%s",
+					iter.stream.number,
+					iter.block.number_in_stream,
+					iter.block.number_in_file,
+					iter.block.compressed_file_offset,
+					iter.block.uncompressed_file_offset,
+					iter.block.total_size,
+					iter.block.uncompressed_size,
+					get_ratio(iter.block.total_size,
+						iter.block.uncompressed_size),
+					check_names[iter.stream.flags->check]);
+
+			if (message_verbosity_get() >= V_DEBUG)
+				printf("\t%s\t%" PRIu32 "\t%s\t%" PRIu64
+						"\t%" PRIu64 "\t%s",
+						check_value,
+						bhi.header_size,
+						bhi.flags,
+						bhi.compressed_size,
+						bhi.memusage,
+						bhi.filter_chain);
+
+			putchar('\n');
+			block_header_info_end(&bhi);
+		}
+	}
+
+	if (message_verbosity_get() >= V_DEBUG)
+		printf("summary\t%" PRIu64 "\t%s\t%" PRIu32 "\n",
+				xfi->memusage_max,
+				xfi->all_have_sizes ? "yes" : "no",
+				xfi->min_version);
+
+	return false;
+}
+
+
+static void
+update_totals(const xz_file_info *xfi)
+{
+	// TODO: Integer overflow checks
+	++totals.files;
+	totals.streams += lzma_index_stream_count(xfi->idx);
+	totals.blocks += lzma_index_block_count(xfi->idx);
+	totals.compressed_size += lzma_index_file_size(xfi->idx);
+	totals.uncompressed_size += lzma_index_uncompressed_size(xfi->idx);
+	totals.stream_padding += xfi->stream_padding;
+	totals.checks |= lzma_index_checks(xfi->idx);
+
+	if (totals.memusage_max < xfi->memusage_max)
+		totals.memusage_max = xfi->memusage_max;
+
+	if (totals.min_version < xfi->min_version)
+		totals.min_version = xfi->min_version;
+
+	totals.all_have_sizes &= xfi->all_have_sizes;
+
+	return;
+}
+
+
+static void
+print_totals_basic(void)
+{
+	// Print a separator line.
+	char line[80];
+	memset(line, '-', sizeof(line));
+	line[sizeof(line) - 1] = '\0';
+	puts(line);
+
+	// Get the check names.
+	char checks[CHECKS_STR_SIZE];
+	get_check_names(checks, totals.checks, false);
+
+	// Print the totals except the file count, which needs
+	// special handling.
+	printf("%5s %7s  %11s  %11s  %5s  %-7s ",
+			uint64_to_str(totals.streams, 0),
+			uint64_to_str(totals.blocks, 1),
+			uint64_to_nicestr(totals.compressed_size,
+				NICESTR_B, NICESTR_TIB, false, 2),
+			uint64_to_nicestr(totals.uncompressed_size,
+				NICESTR_B, NICESTR_TIB, false, 3),
+			get_ratio(totals.compressed_size,
+				totals.uncompressed_size),
+			checks);
+
+	// Since we print totals only when there are at least two files,
+	// the English message will always use "%s files". But some other
+	// languages need different forms for different plurals so we
+	// have to translate this with ngettext().
+	//
+	// TRANSLATORS: %s is an integer. Only the plural form of this
+	// message is used (e.g. "2 files"). Test with "xz -l foo.xz bar.xz".
+	printf(ngettext("%s file\n", "%s files\n",
+			totals.files <= ULONG_MAX ? totals.files
+				: (totals.files % 1000000) + 1000000),
+			uint64_to_str(totals.files, 0));
+
+	return;
+}
+
+
+static void
+print_totals_adv(void)
+{
+	putchar('\n');
+	puts(_("Totals:"));
+	printf("  %-*s %s\n", COLON_STR(COLON_STR_NUMBER_OF_FILES),
+			uint64_to_str(totals.files, 0));
+	print_adv_helper(totals.streams, totals.blocks,
+			totals.compressed_size, totals.uncompressed_size,
+			totals.checks, totals.stream_padding);
+
+	if (message_verbosity_get() >= V_DEBUG) {
+		printf("  %-*s %s MiB\n", COLON_STR(COLON_STR_MEMORY_NEEDED),
+				uint64_to_str(
+				round_up_to_mib(totals.memusage_max), 0));
+		printf("  %-*s %s\n", COLON_STR(COLON_STR_SIZES_IN_HEADERS),
+				totals.all_have_sizes ? _("Yes") : _("No"));
+		//printf("  %-*s %s\n", COLON_STR(COLON_STR_MINIMUM_XZ_VERSION),
+		printf(_("  Minimum XZ Utils version: %s\n"),
+				xz_ver_to_str(totals.min_version));
+	}
+
+	return;
+}
+
+
+static void
+print_totals_robot(void)
+{
+	char checks[CHECKS_STR_SIZE];
+	get_check_names(checks, totals.checks, false);
+
+	printf("totals\t%" PRIu64 "\t%" PRIu64 "\t%" PRIu64 "\t%" PRIu64
+			"\t%s\t%s\t%" PRIu64 "\t%" PRIu64,
+			totals.streams,
+			totals.blocks,
+			totals.compressed_size,
+			totals.uncompressed_size,
+			get_ratio(totals.compressed_size,
+				totals.uncompressed_size),
+			checks,
+			totals.stream_padding,
+			totals.files);
+
+	if (message_verbosity_get() >= V_DEBUG)
+		printf("\t%" PRIu64 "\t%s\t%" PRIu32,
+				totals.memusage_max,
+				totals.all_have_sizes ? "yes" : "no",
+				totals.min_version);
+
+	putchar('\n');
+
+	return;
+}
+
+
+extern void
+list_totals(void)
+{
+	if (opt_robot) {
+		// Always print totals in --robot mode. It can be convenient
+		// in some cases and doesn't complicate usage of the
+		// single-file case much.
+		print_totals_robot();
+
+	} else if (totals.files > 1) {
+		// For non-robot mode, totals are printed only if there
+		// is more than one file.
+		if (message_verbosity_get() <= V_WARNING)
+			print_totals_basic();
+		else
+			print_totals_adv();
+	}
+
+	return;
+}
+
+
+extern void
+list_file(const char *filename)
+{
+	if (opt_format != FORMAT_XZ && opt_format != FORMAT_AUTO)
+		message_fatal(_("--list works only on .xz files "
+				"(--format=xz or --format=auto)"));
+
+	message_filename(filename);
+
+	if (filename == stdin_filename) {
+		message_error(_("--list does not support reading from "
+				"standard input"));
+		return;
+	}
+
+	init_field_widths();
+
+	// Unset opt_stdout so that io_open_src() won't accept special files.
+	// Set opt_force so that io_open_src() will follow symlinks.
+	opt_stdout = false;
+	opt_force = true;
+	file_pair *pair = io_open_src(filename);
+	if (pair == NULL)
+		return;
+
+	xz_file_info xfi = XZ_FILE_INFO_INIT;
+	if (!parse_indexes(&xfi, pair)) {
+		bool fail;
+
+		// We have three main modes:
+		//  - --robot, which has submodes if --verbose is specified
+		//    once or twice
+		//  - Normal --list without --verbose
+		//  - --list with one or two --verbose
+		if (opt_robot)
+			fail = print_info_robot(&xfi, pair);
+		else if (message_verbosity_get() <= V_WARNING)
+			fail = print_info_basic(&xfi, pair);
+		else
+			fail = print_info_adv(&xfi, pair);
+
+		// Update the totals that are displayed after all
+		// the individual files have been listed. Don't count
+		// broken files.
+		if (!fail)
+			update_totals(&xfi);
+
+		lzma_index_end(xfi.idx, NULL);
+	}
+
+	io_close(pair, false);
+	return;
+}
diff --git a/src/xz/list.h b/src/xz/list.h
new file mode 100644
index 0000000..a4c6ec7
--- /dev/null
+++ b/src/xz/list.h
@@ -0,0 +1,18 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       list.h
+/// \brief      List information about .xz files
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+/// \brief      List information about the given .xz file
+extern void list_file(const char *filename);
+
+
+/// \brief      Show the totals after all files have been listed
+extern void list_totals(void);
diff --git a/src/xz/main.c b/src/xz/main.c
new file mode 100644
index 0000000..c9c3dec
--- /dev/null
+++ b/src/xz/main.c
@@ -0,0 +1,344 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       main.c
+/// \brief      main()
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+#include <ctype.h>
+
+/// Exit status to use. This can be changed with set_exit_status().
+static enum exit_status_type exit_status = E_SUCCESS;
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+/// exit_status has to be protected with a critical section due to
+/// how "signal handling" is done on Windows. See signals.c for details.
+static CRITICAL_SECTION exit_status_cs;
+#endif
+
+/// True if --no-warn is specified. When this is true, we don't set
+/// the exit status to E_WARNING when something worth a warning happens.
+static bool no_warn = false;
+
+
+extern void
+set_exit_status(enum exit_status_type new_status)
+{
+	assert(new_status == E_WARNING || new_status == E_ERROR);
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+	EnterCriticalSection(&exit_status_cs);
+#endif
+
+	if (exit_status != E_ERROR)
+		exit_status = new_status;
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+	LeaveCriticalSection(&exit_status_cs);
+#endif
+
+	return;
+}
+
+
+extern void
+set_exit_no_warn(void)
+{
+	no_warn = true;
+	return;
+}
+
+
+static const char *
+read_name(const args_info *args)
+{
+	// FIXME: Maybe we should have some kind of memory usage limit here
+	// like the tool has for the actual compression and decompression.
+	// Giving some huge text file with --files0 makes us to read the
+	// whole file in RAM.
+	static char *name = NULL;
+	static size_t size = 256;
+
+	// Allocate the initial buffer. This is never freed, since after it
+	// is no longer needed, the program exits very soon. It is safe to
+	// use xmalloc() and xrealloc() in this function, because while
+	// executing this function, no files are open for writing, and thus
+	// there's no need to cleanup anything before exiting.
+	if (name == NULL)
+		name = xmalloc(size);
+
+	// Write position in name
+	size_t pos = 0;
+
+	// Read one character at a time into name.
+	while (!user_abort) {
+		const int c = fgetc(args->files_file);
+
+		if (ferror(args->files_file)) {
+			// Take care of EINTR since we have established
+			// the signal handlers already.
+			if (errno == EINTR)
+				continue;
+
+			message_error(_("%s: Error reading filenames: %s"),
+					args->files_name, strerror(errno));
+			return NULL;
+		}
+
+		if (feof(args->files_file)) {
+			if (pos != 0)
+				message_error(_("%s: Unexpected end of input "
+						"when reading filenames"),
+						args->files_name);
+
+			return NULL;
+		}
+
+		if (c == args->files_delim) {
+			// We allow consecutive newline (--files) or '\0'
+			// characters (--files0), and ignore such empty
+			// filenames.
+			if (pos == 0)
+				continue;
+
+			// A non-empty name was read. Terminate it with '\0'
+			// and return it.
+			name[pos] = '\0';
+			return name;
+		}
+
+		if (c == '\0') {
+			// A null character was found when using --files,
+			// which expects plain text input separated with
+			// newlines.
+			message_error(_("%s: Null character found when "
+					"reading filenames; maybe you meant "
+					"to use `--files0' instead "
+					"of `--files'?"), args->files_name);
+			return NULL;
+		}
+
+		name[pos++] = c;
+
+		// Allocate more memory if needed. There must always be space
+		// at least for one character to allow terminating the string
+		// with '\0'.
+		if (pos == size) {
+			size *= 2;
+			name = xrealloc(name, size);
+		}
+	}
+
+	return NULL;
+}
+
+
+int
+main(int argc, char **argv)
+{
+#ifdef HAVE_PLEDGE
+	// OpenBSD's pledge(2) sandbox
+	//
+	// Unconditionally enable sandboxing with fairly relaxed promises.
+	// This is still way better than having no sandbox at all. :-)
+	// More strict promises will be made later in file_io.c if possible.
+	if (pledge("stdio rpath wpath cpath fattr", "")) {
+		// Don't translate the string or use message_fatal() as
+		// those haven't been initialized yet.
+		fprintf(stderr, "%s: Failed to enable the sandbox\n", argv[0]);
+		return E_ERROR;
+	}
+#endif
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+	InitializeCriticalSection(&exit_status_cs);
+#endif
+
+	// Set up the progname variable.
+	tuklib_progname_init(argv);
+
+	// Initialize the file I/O. This makes sure that
+	// stdin, stdout, and stderr are something valid.
+	io_init();
+
+	// Set up the locale and message translations.
+	tuklib_gettext_init(PACKAGE, LOCALEDIR);
+
+	// Initialize handling of error/warning/other messages.
+	message_init();
+
+	// Set hardware-dependent default values. These can be overridden
+	// on the command line, thus this must be done before args_parse().
+	hardware_init();
+
+	// Parse the command line arguments and get an array of filenames.
+	// This doesn't return if something is wrong with the command line
+	// arguments. If there are no arguments, one filename ("-") is still
+	// returned to indicate stdin.
+	args_info args;
+	args_parse(&args, argc, argv);
+
+	if (opt_mode != MODE_LIST && opt_robot)
+		message_fatal(_("Compression and decompression with --robot "
+			"are not supported yet."));
+
+	// Tell the message handling code how many input files there are if
+	// we know it. This way the progress indicator can show it.
+	if (args.files_name != NULL)
+		message_set_files(0);
+	else
+		message_set_files(args.arg_count);
+
+	// Refuse to write compressed data to standard output if it is
+	// a terminal.
+	if (opt_mode == MODE_COMPRESS) {
+		if (opt_stdout || (args.arg_count == 1
+				&& strcmp(args.arg_names[0], "-") == 0)) {
+			if (is_tty_stdout()) {
+				message_try_help();
+				tuklib_exit(E_ERROR, E_ERROR, false);
+			}
+		}
+	}
+
+	// Set up the signal handlers. We don't need these before we
+	// start the actual action and not in --list mode, so this is
+	// done after parsing the command line arguments.
+	//
+	// It's good to keep signal handlers in normal compression and
+	// decompression modes even when only writing to stdout, because
+	// we might need to restore O_APPEND flag on stdout before exiting.
+	// In --test mode, signal handlers aren't really needed, but let's
+	// keep them there for consistency with normal decompression.
+	if (opt_mode != MODE_LIST)
+		signals_init();
+
+#ifdef ENABLE_SANDBOX
+	// Set a flag that sandboxing is allowed if all these are true:
+	//   - --files or --files0 wasn't used.
+	//   - There is exactly one input file or we are reading from stdin.
+	//   - We won't create any files: output goes to stdout or --test
+	//     or --list was used. Note that --test implies opt_stdout = true
+	//     but --list doesn't.
+	//
+	// This is obviously not ideal but it was easy to implement and
+	// it covers the most common use cases.
+	//
+	// TODO: Make sandboxing work for other situations too.
+	if (args.files_name == NULL && args.arg_count == 1
+			&& (opt_stdout || strcmp("-", args.arg_names[0]) == 0
+				|| opt_mode == MODE_LIST))
+		io_allow_sandbox();
+#endif
+
+	// coder_run() handles compression, decompression, and testing.
+	// list_file() is for --list.
+	void (*run)(const char *filename) = &coder_run;
+#ifdef HAVE_DECODERS
+	if (opt_mode == MODE_LIST)
+		run = &list_file;
+#endif
+
+	// Process the files given on the command line. Note that if no names
+	// were given, args_parse() gave us a fake "-" filename.
+	for (unsigned i = 0; i < args.arg_count && !user_abort; ++i) {
+		if (strcmp("-", args.arg_names[i]) == 0) {
+			// Processing from stdin to stdout. Check that we
+			// aren't writing compressed data to a terminal or
+			// reading it from a terminal.
+			if (opt_mode == MODE_COMPRESS) {
+				if (is_tty_stdout())
+					continue;
+			} else if (is_tty_stdin()) {
+				continue;
+			}
+
+			// It doesn't make sense to compress data from stdin
+			// if we are supposed to read filenames from stdin
+			// too (enabled with --files or --files0).
+			if (args.files_name == stdin_filename) {
+				message_error(_("Cannot read data from "
+						"standard input when "
+						"reading filenames "
+						"from standard input"));
+				continue;
+			}
+
+			// Replace the "-" with a special pointer, which is
+			// recognized by coder_run() and other things.
+			// This way error messages get a proper filename
+			// string and the code still knows that it is
+			// handling the special case of stdin.
+			args.arg_names[i] = (char *)stdin_filename;
+		}
+
+		// Do the actual compression or decompression.
+		run(args.arg_names[i]);
+	}
+
+	// If --files or --files0 was used, process the filenames from the
+	// given file or stdin. Note that here we don't consider "-" to
+	// indicate stdin like we do with the command line arguments.
+	if (args.files_name != NULL) {
+		// read_name() checks for user_abort so we don't need to
+		// check it as loop termination condition.
+		while (true) {
+			const char *name = read_name(&args);
+			if (name == NULL)
+				break;
+
+			// read_name() doesn't return empty names.
+			assert(name[0] != '\0');
+			run(name);
+		}
+
+		if (args.files_name != stdin_filename)
+			(void)fclose(args.files_file);
+	}
+
+#ifdef HAVE_DECODERS
+	// All files have now been handled. If in --list mode, display
+	// the totals before exiting. We don't have signal handlers
+	// enabled in --list mode, so we don't need to check user_abort.
+	if (opt_mode == MODE_LIST) {
+		assert(!user_abort);
+		list_totals();
+	}
+#endif
+
+#ifndef NDEBUG
+	coder_free();
+	args_free();
+#endif
+
+	// If we have got a signal, raise it to kill the program instead
+	// of calling tuklib_exit().
+	signals_exit();
+
+	// Make a local copy of exit_status to keep the Windows code
+	// thread safe. At this point it is fine if we miss the user
+	// pressing C-c and don't set the exit_status to E_ERROR on
+	// Windows.
+#if defined(_WIN32) && !defined(__CYGWIN__)
+	EnterCriticalSection(&exit_status_cs);
+#endif
+
+	enum exit_status_type es = exit_status;
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+	LeaveCriticalSection(&exit_status_cs);
+#endif
+
+	// Suppress the exit status indicating a warning if --no-warn
+	// was specified.
+	if (es == E_WARNING && no_warn)
+		es = E_SUCCESS;
+
+	tuklib_exit((int)es, E_ERROR, message_verbosity_get() != V_SILENT);
+}
diff --git a/src/xz/main.h b/src/xz/main.h
new file mode 100644
index 0000000..323f2f7
--- /dev/null
+++ b/src/xz/main.h
@@ -0,0 +1,30 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       main.h
+/// \brief      Miscellaneous declarations
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+/// Possible exit status values. These are the same as used by gzip and bzip2.
+enum exit_status_type {
+	E_SUCCESS  = 0,
+	E_ERROR    = 1,
+	E_WARNING  = 2,
+};
+
+
+/// Sets the exit status after a warning or error has occurred. If new_status
+/// is E_WARNING and the old exit status was already E_ERROR, the exit
+/// status is not changed.
+extern void set_exit_status(enum exit_status_type new_status);
+
+
+/// Use E_SUCCESS instead of E_WARNING if something worth a warning occurs
+/// but nothing worth an error has occurred. This is called when --no-warn
+/// is specified.
+extern void set_exit_no_warn(void);
diff --git a/src/xz/message.c b/src/xz/message.c
new file mode 100644
index 0000000..c54ebc5
--- /dev/null
+++ b/src/xz/message.c
@@ -0,0 +1,1146 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       message.c
+/// \brief      Printing messages
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+
+#include <stdarg.h>
+
+
+/// Number of the current file
+static unsigned int files_pos = 0;
+
+/// Total number of input files; zero if unknown.
+static unsigned int files_total;
+
+/// Verbosity level
+static enum message_verbosity verbosity = V_WARNING;
+
+/// Filename which we will print with the verbose messages
+static const char *filename;
+
+/// True once the a filename has been printed to stderr as part of progress
+/// message. If automatic progress updating isn't enabled, this becomes true
+/// after the first progress message has been printed due to user sending
+/// SIGINFO, SIGUSR1, or SIGALRM. Once this variable is true, we will print
+/// an empty line before the next filename to make the output more readable.
+static bool first_filename_printed = false;
+
+/// This is set to true when we have printed the current filename to stderr
+/// as part of a progress message. This variable is useful only if not
+/// updating progress automatically: if user sends many SIGINFO, SIGUSR1, or
+/// SIGALRM signals, we won't print the name of the same file multiple times.
+static bool current_filename_printed = false;
+
+/// True if we should print progress indicator and update it automatically
+/// if also verbose >= V_VERBOSE.
+static bool progress_automatic;
+
+/// True if message_progress_start() has been called but
+/// message_progress_end() hasn't been called yet.
+static bool progress_started = false;
+
+/// This is true when a progress message was printed and the cursor is still
+/// on the same line with the progress message. In that case, a newline has
+/// to be printed before any error messages.
+static bool progress_active = false;
+
+/// Pointer to lzma_stream used to do the encoding or decoding.
+static lzma_stream *progress_strm;
+
+/// This is true if we are in passthru mode (not actually compressing or
+/// decompressing) and thus cannot use lzma_get_progress(progress_strm, ...).
+/// That is, we are using coder_passthru() in coder.c.
+static bool progress_is_from_passthru;
+
+/// Expected size of the input stream is needed to show completion percentage
+/// and estimate remaining time.
+static uint64_t expected_in_size;
+
+
+// Use alarm() and SIGALRM when they are supported. This has two minor
+// advantages over the alternative of polling gettimeofday():
+//  - It is possible for the user to send SIGINFO, SIGUSR1, or SIGALRM to
+//    get intermediate progress information even when --verbose wasn't used
+//    or stderr is not a terminal.
+//  - alarm() + SIGALRM seems to have slightly less overhead than polling
+//    gettimeofday().
+#ifdef SIGALRM
+
+const int message_progress_sigs[] = {
+	SIGALRM,
+#ifdef SIGINFO
+	SIGINFO,
+#endif
+#ifdef SIGUSR1
+	SIGUSR1,
+#endif
+	0
+};
+
+/// The signal handler for SIGALRM sets this to true. It is set back to false
+/// once the progress message has been updated.
+static volatile sig_atomic_t progress_needs_updating = false;
+
+/// Signal handler for SIGALRM
+static void
+progress_signal_handler(int sig lzma_attribute((__unused__)))
+{
+	progress_needs_updating = true;
+	return;
+}
+
+#else
+
+/// This is true when progress message printing is wanted. Using the same
+/// variable name as above to avoid some ifdefs.
+static bool progress_needs_updating = false;
+
+/// Elapsed time when the next progress message update should be done.
+static uint64_t progress_next_update;
+
+#endif
+
+
+extern void
+message_init(void)
+{
+	// If --verbose is used, we use a progress indicator if and only
+	// if stderr is a terminal. If stderr is not a terminal, we print
+	// verbose information only after finishing the file. As a special
+	// exception, even if --verbose was not used, user can send SIGALRM
+	// to make us print progress information once without automatic
+	// updating.
+	progress_automatic = isatty(STDERR_FILENO);
+
+	// Commented out because COLUMNS is rarely exported to environment.
+	// Most users have at least 80 columns anyway, let's think something
+	// fancy here if enough people complain.
+/*
+	if (progress_automatic) {
+		// stderr is a terminal. Check the COLUMNS environment
+		// variable to see if the terminal is wide enough. If COLUMNS
+		// doesn't exist or it has some unparsable value, we assume
+		// that the terminal is wide enough.
+		const char *columns_str = getenv("COLUMNS");
+		if (columns_str != NULL) {
+			char *endptr;
+			const long columns = strtol(columns_str, &endptr, 10);
+			if (*endptr != '\0' || columns < 80)
+				progress_automatic = false;
+		}
+	}
+*/
+
+#ifdef SIGALRM
+	// Establish the signal handlers which set a flag to tell us that
+	// progress info should be updated.
+	struct sigaction sa;
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = 0;
+	sa.sa_handler = &progress_signal_handler;
+
+	for (size_t i = 0; message_progress_sigs[i] != 0; ++i)
+		if (sigaction(message_progress_sigs[i], &sa, NULL))
+			message_signal_handler();
+#endif
+
+	return;
+}
+
+
+extern void
+message_verbosity_increase(void)
+{
+	if (verbosity < V_DEBUG)
+		++verbosity;
+
+	return;
+}
+
+
+extern void
+message_verbosity_decrease(void)
+{
+	if (verbosity > V_SILENT)
+		--verbosity;
+
+	return;
+}
+
+
+extern enum message_verbosity
+message_verbosity_get(void)
+{
+	return verbosity;
+}
+
+
+extern void
+message_set_files(unsigned int files)
+{
+	files_total = files;
+	return;
+}
+
+
+/// Prints the name of the current file if it hasn't been printed already,
+/// except if we are processing exactly one stream from stdin to stdout.
+/// I think it looks nicer to not print "(stdin)" when --verbose is used
+/// in a pipe and no other files are processed.
+static void
+print_filename(void)
+{
+	if (!opt_robot && (files_total != 1 || filename != stdin_filename)) {
+		signals_block();
+
+		FILE *file = opt_mode == MODE_LIST ? stdout : stderr;
+
+		// If a file was already processed, put an empty line
+		// before the next filename to improve readability.
+		if (first_filename_printed)
+			fputc('\n', file);
+
+		first_filename_printed = true;
+		current_filename_printed = true;
+
+		// If we don't know how many files there will be due
+		// to usage of --files or --files0.
+		if (files_total == 0)
+			fprintf(file, "%s (%u)\n", filename,
+					files_pos);
+		else
+			fprintf(file, "%s (%u/%u)\n", filename,
+					files_pos, files_total);
+
+		signals_unblock();
+	}
+
+	return;
+}
+
+
+extern void
+message_filename(const char *src_name)
+{
+	// Start numbering the files starting from one.
+	++files_pos;
+	filename = src_name;
+
+	if (verbosity >= V_VERBOSE
+			&& (progress_automatic || opt_mode == MODE_LIST))
+		print_filename();
+	else
+		current_filename_printed = false;
+
+	return;
+}
+
+
+extern void
+message_progress_start(lzma_stream *strm, bool is_passthru, uint64_t in_size)
+{
+	// Store the pointer to the lzma_stream used to do the coding.
+	// It is needed to find out the position in the stream.
+	progress_strm = strm;
+	progress_is_from_passthru = is_passthru;
+
+	// Store the expected size of the file. If we aren't printing any
+	// statistics, then is will be unused. But since it is possible
+	// that the user sends us a signal to show statistics, we need
+	// to have it available anyway.
+	expected_in_size = in_size;
+
+	// Indicate that progress info may need to be printed before
+	// printing error messages.
+	progress_started = true;
+
+	// If progress indicator is wanted, print the filename and possibly
+	// the file count now.
+	if (verbosity >= V_VERBOSE && progress_automatic) {
+		// Start the timer to display the first progress message
+		// after one second. An alternative would be to show the
+		// first message almost immediately, but delaying by one
+		// second looks better to me, since extremely early
+		// progress info is pretty much useless.
+#ifdef SIGALRM
+		// First disable a possibly existing alarm.
+		alarm(0);
+		progress_needs_updating = false;
+		alarm(1);
+#else
+		progress_needs_updating = true;
+		progress_next_update = 1000;
+#endif
+	}
+
+	return;
+}
+
+
+/// Make the string indicating completion percentage.
+static const char *
+progress_percentage(uint64_t in_pos)
+{
+	// If the size of the input file is unknown or the size told us is
+	// clearly wrong since we have processed more data than the alleged
+	// size of the file, show a static string indicating that we have
+	// no idea of the completion percentage.
+	if (expected_in_size == 0 || in_pos > expected_in_size)
+		return "--- %";
+
+	// Never show 100.0 % before we actually are finished.
+	double percentage = (double)(in_pos) / (double)(expected_in_size)
+			* 99.9;
+
+	// Use big enough buffer to hold e.g. a multibyte decimal point.
+	static char buf[16];
+	snprintf(buf, sizeof(buf), "%.1f %%", percentage);
+
+	return buf;
+}
+
+
+/// Make the string containing the amount of input processed, amount of
+/// output produced, and the compression ratio.
+static const char *
+progress_sizes(uint64_t compressed_pos, uint64_t uncompressed_pos, bool final)
+{
+	// Use big enough buffer to hold e.g. a multibyte thousand separators.
+	static char buf[128];
+	char *pos = buf;
+	size_t left = sizeof(buf);
+
+	// Print the sizes. If this the final message, use more reasonable
+	// units than MiB if the file was small.
+	const enum nicestr_unit unit_min = final ? NICESTR_B : NICESTR_MIB;
+	my_snprintf(&pos, &left, "%s / %s",
+			uint64_to_nicestr(compressed_pos,
+				unit_min, NICESTR_TIB, false, 0),
+			uint64_to_nicestr(uncompressed_pos,
+				unit_min, NICESTR_TIB, false, 1));
+
+	// Avoid division by zero. If we cannot calculate the ratio, set
+	// it to some nice number greater than 10.0 so that it gets caught
+	// in the next if-clause.
+	const double ratio = uncompressed_pos > 0
+			? (double)(compressed_pos) / (double)(uncompressed_pos)
+			: 16.0;
+
+	// If the ratio is very bad, just indicate that it is greater than
+	// 9.999. This way the length of the ratio field stays fixed.
+	if (ratio > 9.999)
+		snprintf(pos, left, " > %.3f", 9.999);
+	else
+		snprintf(pos, left, " = %.3f", ratio);
+
+	return buf;
+}
+
+
+/// Make the string containing the processing speed of uncompressed data.
+static const char *
+progress_speed(uint64_t uncompressed_pos, uint64_t elapsed)
+{
+	// Don't print the speed immediately, since the early values look
+	// somewhat random.
+	if (elapsed < 3000)
+		return "";
+
+	// The first character of KiB/s, MiB/s, or GiB/s:
+	static const char unit[] = { 'K', 'M', 'G' };
+
+	size_t unit_index = 0;
+
+	// Calculate the speed as KiB/s.
+	double speed = (double)(uncompressed_pos)
+			/ ((double)(elapsed) * (1024.0 / 1000.0));
+
+	// Adjust the unit of the speed if needed.
+	while (speed > 999.0) {
+		speed /= 1024.0;
+		if (++unit_index == ARRAY_SIZE(unit))
+			return ""; // Way too fast ;-)
+	}
+
+	// Use decimal point only if the number is small. Examples:
+	//  - 0.1 KiB/s
+	//  - 9.9 KiB/s
+	//  - 99 KiB/s
+	//  - 999 KiB/s
+	// Use big enough buffer to hold e.g. a multibyte decimal point.
+	static char buf[16];
+	snprintf(buf, sizeof(buf), "%.*f %ciB/s",
+			speed > 9.9 ? 0 : 1, speed, unit[unit_index]);
+	return buf;
+}
+
+
+/// Make a string indicating elapsed time. The format is either
+/// M:SS or H:MM:SS depending on if the time is an hour or more.
+static const char *
+progress_time(uint64_t mseconds)
+{
+	// 9999 hours = 416 days
+	static char buf[sizeof("9999:59:59")];
+
+	// 32-bit variable is enough for elapsed time (136 years).
+	uint32_t seconds = (uint32_t)(mseconds / 1000);
+
+	// Don't show anything if the time is zero or ridiculously big.
+	if (seconds == 0 || seconds > ((9999 * 60) + 59) * 60 + 59)
+		return "";
+
+	uint32_t minutes = seconds / 60;
+	seconds %= 60;
+
+	if (minutes >= 60) {
+		const uint32_t hours = minutes / 60;
+		minutes %= 60;
+		snprintf(buf, sizeof(buf),
+				"%" PRIu32 ":%02" PRIu32 ":%02" PRIu32,
+				hours, minutes, seconds);
+	} else {
+		snprintf(buf, sizeof(buf), "%" PRIu32 ":%02" PRIu32,
+				minutes, seconds);
+	}
+
+	return buf;
+}
+
+
+/// Return a string containing estimated remaining time when
+/// reasonably possible.
+static const char *
+progress_remaining(uint64_t in_pos, uint64_t elapsed)
+{
+	// Don't show the estimated remaining time when it wouldn't
+	// make sense:
+	//  - Input size is unknown.
+	//  - Input has grown bigger since we started (de)compressing.
+	//  - We haven't processed much data yet, so estimate would be
+	//    too inaccurate.
+	//  - Only a few seconds has passed since we started (de)compressing,
+	//    so estimate would be too inaccurate.
+	if (expected_in_size == 0 || in_pos > expected_in_size
+			|| in_pos < (UINT64_C(1) << 19) || elapsed < 8000)
+		return "";
+
+	// Calculate the estimate. Don't give an estimate of zero seconds,
+	// since it is possible that all the input has been already passed
+	// to the library, but there is still quite a bit of output pending.
+	uint32_t remaining = (uint32_t)((double)(expected_in_size - in_pos)
+			* ((double)(elapsed) / 1000.0) / (double)(in_pos));
+	if (remaining < 1)
+		remaining = 1;
+
+	static char buf[sizeof("9 h 55 min")];
+
+	// Select appropriate precision for the estimated remaining time.
+	if (remaining <= 10) {
+		// A maximum of 10 seconds remaining.
+		// Show the number of seconds as is.
+		snprintf(buf, sizeof(buf), "%" PRIu32 " s", remaining);
+
+	} else if (remaining <= 50) {
+		// A maximum of 50 seconds remaining.
+		// Round up to the next multiple of five seconds.
+		remaining = (remaining + 4) / 5 * 5;
+		snprintf(buf, sizeof(buf), "%" PRIu32 " s", remaining);
+
+	} else if (remaining <= 590) {
+		// A maximum of 9 minutes and 50 seconds remaining.
+		// Round up to the next multiple of ten seconds.
+		remaining = (remaining + 9) / 10 * 10;
+		snprintf(buf, sizeof(buf), "%" PRIu32 " min %" PRIu32 " s",
+				remaining / 60, remaining % 60);
+
+	} else if (remaining <= 59 * 60) {
+		// A maximum of 59 minutes remaining.
+		// Round up to the next multiple of a minute.
+		remaining = (remaining + 59) / 60;
+		snprintf(buf, sizeof(buf), "%" PRIu32 " min", remaining);
+
+	} else if (remaining <= 9 * 3600 + 50 * 60) {
+		// A maximum of 9 hours and 50 minutes left.
+		// Round up to the next multiple of ten minutes.
+		remaining = (remaining + 599) / 600 * 10;
+		snprintf(buf, sizeof(buf), "%" PRIu32 " h %" PRIu32 " min",
+				remaining / 60, remaining % 60);
+
+	} else if (remaining <= 23 * 3600) {
+		// A maximum of 23 hours remaining.
+		// Round up to the next multiple of an hour.
+		remaining = (remaining + 3599) / 3600;
+		snprintf(buf, sizeof(buf), "%" PRIu32 " h", remaining);
+
+	} else if (remaining <= 9 * 24 * 3600 + 23 * 3600) {
+		// A maximum of 9 days and 23 hours remaining.
+		// Round up to the next multiple of an hour.
+		remaining = (remaining + 3599) / 3600;
+		snprintf(buf, sizeof(buf), "%" PRIu32 " d %" PRIu32 " h",
+				remaining / 24, remaining % 24);
+
+	} else if (remaining <= 999 * 24 * 3600) {
+		// A maximum of 999 days remaining. ;-)
+		// Round up to the next multiple of a day.
+		remaining = (remaining + 24 * 3600 - 1) / (24 * 3600);
+		snprintf(buf, sizeof(buf), "%" PRIu32 " d", remaining);
+
+	} else {
+		// The estimated remaining time is too big. Don't show it.
+		return "";
+	}
+
+	return buf;
+}
+
+
+/// Get how much uncompressed and compressed data has been processed.
+static void
+progress_pos(uint64_t *in_pos,
+		uint64_t *compressed_pos, uint64_t *uncompressed_pos)
+{
+	uint64_t out_pos;
+	if (progress_is_from_passthru) {
+		// In passthru mode the progress info is in total_in/out but
+		// the *progress_strm itself isn't initialized and thus we
+		// cannot use lzma_get_progress().
+		*in_pos = progress_strm->total_in;
+		out_pos = progress_strm->total_out;
+	} else {
+		lzma_get_progress(progress_strm, in_pos, &out_pos);
+	}
+
+	// It cannot have processed more input than it has been given.
+	assert(*in_pos <= progress_strm->total_in);
+
+	// It cannot have produced more output than it claims to have ready.
+	assert(out_pos >= progress_strm->total_out);
+
+	if (opt_mode == MODE_COMPRESS) {
+		*compressed_pos = out_pos;
+		*uncompressed_pos = *in_pos;
+	} else {
+		*compressed_pos = *in_pos;
+		*uncompressed_pos = out_pos;
+	}
+
+	return;
+}
+
+
+extern void
+message_progress_update(void)
+{
+	if (!progress_needs_updating)
+		return;
+
+	// Calculate how long we have been processing this file.
+	const uint64_t elapsed = mytime_get_elapsed();
+
+#ifndef SIGALRM
+	if (progress_next_update > elapsed)
+		return;
+
+	progress_next_update = elapsed + 1000;
+#endif
+
+	// Get our current position in the stream.
+	uint64_t in_pos;
+	uint64_t compressed_pos;
+	uint64_t uncompressed_pos;
+	progress_pos(&in_pos, &compressed_pos, &uncompressed_pos);
+
+	// Block signals so that fprintf() doesn't get interrupted.
+	signals_block();
+
+	// Print the filename if it hasn't been printed yet.
+	if (!current_filename_printed)
+		print_filename();
+
+	// Print the actual progress message. The idea is that there is at
+	// least three spaces between the fields in typical situations, but
+	// even in rare situations there is at least one space.
+	const char *cols[5] = {
+		progress_percentage(in_pos),
+		progress_sizes(compressed_pos, uncompressed_pos, false),
+		progress_speed(uncompressed_pos, elapsed),
+		progress_time(elapsed),
+		progress_remaining(in_pos, elapsed),
+	};
+	fprintf(stderr, "\r %*s %*s   %*s %10s   %10s\r",
+			tuklib_mbstr_fw(cols[0], 6), cols[0],
+			tuklib_mbstr_fw(cols[1], 35), cols[1],
+			tuklib_mbstr_fw(cols[2], 9), cols[2],
+			cols[3],
+			cols[4]);
+
+#ifdef SIGALRM
+	// Updating the progress info was finished. Reset
+	// progress_needs_updating to wait for the next SIGALRM.
+	//
+	// NOTE: This has to be done before alarm(1) or with (very) bad
+	// luck we could be setting this to false after the alarm has already
+	// been triggered.
+	progress_needs_updating = false;
+
+	if (verbosity >= V_VERBOSE && progress_automatic) {
+		// Mark that the progress indicator is active, so if an error
+		// occurs, the error message gets printed cleanly.
+		progress_active = true;
+
+		// Restart the timer so that progress_needs_updating gets
+		// set to true after about one second.
+		alarm(1);
+	} else {
+		// The progress message was printed because user had sent us
+		// SIGALRM. In this case, each progress message is printed
+		// on its own line.
+		fputc('\n', stderr);
+	}
+#else
+	// When SIGALRM isn't supported and we get here, it's always due to
+	// automatic progress update. We set progress_active here too like
+	// described above.
+	assert(verbosity >= V_VERBOSE);
+	assert(progress_automatic);
+	progress_active = true;
+#endif
+
+	signals_unblock();
+
+	return;
+}
+
+
+static void
+progress_flush(bool finished)
+{
+	if (!progress_started || verbosity < V_VERBOSE)
+		return;
+
+	uint64_t in_pos;
+	uint64_t compressed_pos;
+	uint64_t uncompressed_pos;
+	progress_pos(&in_pos, &compressed_pos, &uncompressed_pos);
+
+	// Avoid printing intermediate progress info if some error occurs
+	// in the beginning of the stream. (If something goes wrong later in
+	// the stream, it is sometimes useful to tell the user where the
+	// error approximately occurred, especially if the error occurs
+	// after a time-consuming operation.)
+	if (!finished && !progress_active
+			&& (compressed_pos == 0 || uncompressed_pos == 0))
+		return;
+
+	progress_active = false;
+
+	const uint64_t elapsed = mytime_get_elapsed();
+
+	signals_block();
+
+	// When using the auto-updating progress indicator, the final
+	// statistics are printed in the same format as the progress
+	// indicator itself.
+	if (progress_automatic) {
+		const char *cols[5] = {
+			finished ? "100 %" : progress_percentage(in_pos),
+			progress_sizes(compressed_pos, uncompressed_pos, true),
+			progress_speed(uncompressed_pos, elapsed),
+			progress_time(elapsed),
+			finished ? "" : progress_remaining(in_pos, elapsed),
+		};
+		fprintf(stderr, "\r %*s %*s   %*s %10s   %10s\n",
+				tuklib_mbstr_fw(cols[0], 6), cols[0],
+				tuklib_mbstr_fw(cols[1], 35), cols[1],
+				tuklib_mbstr_fw(cols[2], 9), cols[2],
+				cols[3],
+				cols[4]);
+	} else {
+		// The filename is always printed.
+		fprintf(stderr, "%s: ", filename);
+
+		// Percentage is printed only if we didn't finish yet.
+		if (!finished) {
+			// Don't print the percentage when it isn't known
+			// (starts with a dash).
+			const char *percentage = progress_percentage(in_pos);
+			if (percentage[0] != '-')
+				fprintf(stderr, "%s, ", percentage);
+		}
+
+		// Size information is always printed.
+		fprintf(stderr, "%s", progress_sizes(
+				compressed_pos, uncompressed_pos, true));
+
+		// The speed and elapsed time aren't always shown.
+		const char *speed = progress_speed(uncompressed_pos, elapsed);
+		if (speed[0] != '\0')
+			fprintf(stderr, ", %s", speed);
+
+		const char *elapsed_str = progress_time(elapsed);
+		if (elapsed_str[0] != '\0')
+			fprintf(stderr, ", %s", elapsed_str);
+
+		fputc('\n', stderr);
+	}
+
+	signals_unblock();
+
+	return;
+}
+
+
+extern void
+message_progress_end(bool success)
+{
+	assert(progress_started);
+	progress_flush(success);
+	progress_started = false;
+	return;
+}
+
+
+static void
+vmessage(enum message_verbosity v, const char *fmt, va_list ap)
+{
+	if (v <= verbosity) {
+		signals_block();
+
+		progress_flush(false);
+
+		// TRANSLATORS: This is the program name in the beginning
+		// of the line in messages. Usually it becomes "xz: ".
+		// This is a translatable string because French needs
+		// a space before a colon.
+		fprintf(stderr, _("%s: "), progname);
+
+#ifdef __clang__
+#	pragma GCC diagnostic push
+#	pragma GCC diagnostic ignored "-Wformat-nonliteral"
+#endif
+		vfprintf(stderr, fmt, ap);
+#ifdef __clang__
+#	pragma GCC diagnostic pop
+#endif
+
+		fputc('\n', stderr);
+
+		signals_unblock();
+	}
+
+	return;
+}
+
+
+extern void
+message(enum message_verbosity v, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	vmessage(v, fmt, ap);
+	va_end(ap);
+	return;
+}
+
+
+extern void
+message_warning(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	vmessage(V_WARNING, fmt, ap);
+	va_end(ap);
+
+	set_exit_status(E_WARNING);
+	return;
+}
+
+
+extern void
+message_error(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	vmessage(V_ERROR, fmt, ap);
+	va_end(ap);
+
+	set_exit_status(E_ERROR);
+	return;
+}
+
+
+extern void
+message_fatal(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	vmessage(V_ERROR, fmt, ap);
+	va_end(ap);
+
+	tuklib_exit(E_ERROR, E_ERROR, false);
+}
+
+
+extern void
+message_bug(void)
+{
+	message_fatal(_("Internal error (bug)"));
+}
+
+
+extern void
+message_signal_handler(void)
+{
+	message_fatal(_("Cannot establish signal handlers"));
+}
+
+
+extern const char *
+message_strm(lzma_ret code)
+{
+	switch (code) {
+	case LZMA_NO_CHECK:
+		return _("No integrity check; not verifying file integrity");
+
+	case LZMA_UNSUPPORTED_CHECK:
+		return _("Unsupported type of integrity check; "
+				"not verifying file integrity");
+
+	case LZMA_MEM_ERROR:
+		return strerror(ENOMEM);
+
+	case LZMA_MEMLIMIT_ERROR:
+		return _("Memory usage limit reached");
+
+	case LZMA_FORMAT_ERROR:
+		return _("File format not recognized");
+
+	case LZMA_OPTIONS_ERROR:
+		return _("Unsupported options");
+
+	case LZMA_DATA_ERROR:
+		return _("Compressed data is corrupt");
+
+	case LZMA_BUF_ERROR:
+		return _("Unexpected end of input");
+
+	case LZMA_OK:
+	case LZMA_STREAM_END:
+	case LZMA_GET_CHECK:
+	case LZMA_PROG_ERROR:
+	case LZMA_SEEK_NEEDED:
+	case LZMA_RET_INTERNAL1:
+	case LZMA_RET_INTERNAL2:
+	case LZMA_RET_INTERNAL3:
+	case LZMA_RET_INTERNAL4:
+	case LZMA_RET_INTERNAL5:
+	case LZMA_RET_INTERNAL6:
+	case LZMA_RET_INTERNAL7:
+	case LZMA_RET_INTERNAL8:
+		// Without "default", compiler will warn if new constants
+		// are added to lzma_ret, it is not too easy to forget to
+		// add the new constants to this function.
+		break;
+	}
+
+	return _("Internal error (bug)");
+}
+
+
+extern void
+message_mem_needed(enum message_verbosity v, uint64_t memusage)
+{
+	if (v > verbosity)
+		return;
+
+	// Convert memusage to MiB, rounding up to the next full MiB.
+	// This way the user can always use the displayed usage as
+	// the new memory usage limit. (If we rounded to the nearest,
+	// the user might need to +1 MiB to get high enough limit.)
+	memusage = round_up_to_mib(memusage);
+
+	uint64_t memlimit = hardware_memlimit_get(opt_mode);
+
+	// Handle the case when there is no memory usage limit.
+	// This way we don't print a weird message with a huge number.
+	if (memlimit == UINT64_MAX) {
+		message(v, _("%s MiB of memory is required. "
+				"The limiter is disabled."),
+				uint64_to_str(memusage, 0));
+		return;
+	}
+
+	// With US-ASCII:
+	// 2^64 with thousand separators + " MiB" suffix + '\0' = 26 + 4 + 1
+	// But there may be multibyte chars so reserve enough space.
+	char memlimitstr[128];
+
+	// Show the memory usage limit as MiB unless it is less than 1 MiB.
+	// This way it's easy to notice errors where one has typed
+	// --memory=123 instead of --memory=123MiB.
+	if (memlimit < (UINT32_C(1) << 20)) {
+		snprintf(memlimitstr, sizeof(memlimitstr), "%s B",
+				uint64_to_str(memlimit, 1));
+	} else {
+		// Round up just like with memusage. If this function is
+		// called for informational purposes (to just show the
+		// current usage and limit), we should never show that
+		// the usage is higher than the limit, which would give
+		// a false impression that the memory usage limit isn't
+		// properly enforced.
+		snprintf(memlimitstr, sizeof(memlimitstr), "%s MiB",
+				uint64_to_str(round_up_to_mib(memlimit), 1));
+	}
+
+	message(v, _("%s MiB of memory is required. The limit is %s."),
+			uint64_to_str(memusage, 0), memlimitstr);
+
+	return;
+}
+
+
+extern void
+message_filters_show(enum message_verbosity v, const lzma_filter *filters)
+{
+	if (v > verbosity)
+		return;
+
+	char *buf;
+	const lzma_ret ret = lzma_str_from_filters(&buf, filters,
+			LZMA_STR_ENCODER | LZMA_STR_GETOPT_LONG, NULL);
+	if (ret != LZMA_OK)
+		message_fatal("%s", message_strm(ret));
+
+	fprintf(stderr, _("%s: Filter chain: %s\n"), progname, buf);
+	free(buf);
+	return;
+}
+
+
+extern void
+message_try_help(void)
+{
+	// Print this with V_WARNING instead of V_ERROR to prevent it from
+	// showing up when --quiet has been specified.
+	message(V_WARNING, _("Try `%s --help' for more information."),
+			progname);
+	return;
+}
+
+
+extern void
+message_version(void)
+{
+	// It is possible that liblzma version is different than the command
+	// line tool version, so print both.
+	if (opt_robot) {
+		printf("XZ_VERSION=%" PRIu32 "\nLIBLZMA_VERSION=%" PRIu32 "\n",
+				LZMA_VERSION, lzma_version_number());
+	} else {
+		printf("xz (" PACKAGE_NAME ") " LZMA_VERSION_STRING "\n");
+		printf("liblzma %s\n", lzma_version_string());
+	}
+
+	tuklib_exit(E_SUCCESS, E_ERROR, verbosity != V_SILENT);
+}
+
+
+extern void
+message_help(bool long_help)
+{
+	printf(_("Usage: %s [OPTION]... [FILE]...\n"
+			"Compress or decompress FILEs in the .xz format.\n\n"),
+			progname);
+
+	// NOTE: The short help doesn't currently have options that
+	// take arguments.
+	if (long_help)
+		puts(_("Mandatory arguments to long options are mandatory "
+				"for short options too.\n"));
+
+	if (long_help)
+		puts(_(" Operation mode:\n"));
+
+	puts(_(
+"  -z, --compress      force compression\n"
+"  -d, --decompress    force decompression\n"
+"  -t, --test          test compressed file integrity\n"
+"  -l, --list          list information about .xz files"));
+
+	if (long_help)
+		puts(_("\n Operation modifiers:\n"));
+
+	puts(_(
+"  -k, --keep          keep (don't delete) input files\n"
+"  -f, --force         force overwrite of output file and (de)compress links\n"
+"  -c, --stdout        write to standard output and don't delete input files"));
+	// NOTE: --to-stdout isn't included above because it's not
+	// the recommended spelling. It was copied from gzip but other
+	// compressors with gzip-like syntax don't support it.
+
+	if (long_help) {
+		puts(_(
+"      --single-stream decompress only the first stream, and silently\n"
+"                      ignore possible remaining input data"));
+		puts(_(
+"      --no-sparse     do not create sparse files when decompressing\n"
+"  -S, --suffix=.SUF   use the suffix `.SUF' on compressed files\n"
+"      --files[=FILE]  read filenames to process from FILE; if FILE is\n"
+"                      omitted, filenames are read from the standard input;\n"
+"                      filenames must be terminated with the newline character\n"
+"      --files0[=FILE] like --files but use the null character as terminator"));
+	}
+
+	if (long_help) {
+		puts(_("\n Basic file format and compression options:\n"));
+		puts(_(
+"  -F, --format=FMT    file format to encode or decode; possible values are\n"
+"                      `auto' (default), `xz', `lzma', `lzip', and `raw'\n"
+"  -C, --check=CHECK   integrity check type: `none' (use with caution),\n"
+"                      `crc32', `crc64' (default), or `sha256'"));
+		puts(_(
+"      --ignore-check  don't verify the integrity check when decompressing"));
+	}
+
+	puts(_(
+"  -0 ... -9           compression preset; default is 6; take compressor *and*\n"
+"                      decompressor memory usage into account before using 7-9!"));
+
+	puts(_(
+"  -e, --extreme       try to improve compression ratio by using more CPU time;\n"
+"                      does not affect decompressor memory requirements"));
+
+	puts(_(
+"  -T, --threads=NUM   use at most NUM threads; the default is 1; set to 0\n"
+"                      to use as many threads as there are processor cores"));
+
+	if (long_help) {
+		puts(_(
+"      --block-size=SIZE\n"
+"                      start a new .xz block after every SIZE bytes of input;\n"
+"                      use this to set the block size for threaded compression"));
+		puts(_(
+"      --block-list=SIZES\n"
+"                      start a new .xz block after the given comma-separated\n"
+"                      intervals of uncompressed data"));
+		puts(_(
+"      --flush-timeout=TIMEOUT\n"
+"                      when compressing, if more than TIMEOUT milliseconds has\n"
+"                      passed since the previous flush and reading more input\n"
+"                      would block, all pending data is flushed out"
+		));
+		puts(_( // xgettext:no-c-format
+"      --memlimit-compress=LIMIT\n"
+"      --memlimit-decompress=LIMIT\n"
+"      --memlimit-mt-decompress=LIMIT\n"
+"  -M, --memlimit=LIMIT\n"
+"                      set memory usage limit for compression, decompression,\n"
+"                      threaded decompression, or all of these; LIMIT is in\n"
+"                      bytes, % of RAM, or 0 for defaults"));
+
+		puts(_(
+"      --no-adjust     if compression settings exceed the memory usage limit,\n"
+"                      give an error instead of adjusting the settings downwards"));
+	}
+
+	if (long_help) {
+		puts(_(
+"\n Custom filter chain for compression (alternative for using presets):"));
+
+#if defined(HAVE_ENCODER_LZMA1) || defined(HAVE_DECODER_LZMA1) \
+		|| defined(HAVE_ENCODER_LZMA2) || defined(HAVE_DECODER_LZMA2)
+		// TRANSLATORS: The word "literal" in "literal context bits"
+		// means how many "context bits" to use when encoding
+		// literals. A literal is a single 8-bit byte. It doesn't
+		// mean "literally" here.
+		puts(_(
+"\n"
+"  --lzma1[=OPTS]      LZMA1 or LZMA2; OPTS is a comma-separated list of zero or\n"
+"  --lzma2[=OPTS]      more of the following options (valid values; default):\n"
+"                        preset=PRE reset options to a preset (0-9[e])\n"
+"                        dict=NUM   dictionary size (4KiB - 1536MiB; 8MiB)\n"
+"                        lc=NUM     number of literal context bits (0-4; 3)\n"
+"                        lp=NUM     number of literal position bits (0-4; 0)\n"
+"                        pb=NUM     number of position bits (0-4; 2)\n"
+"                        mode=MODE  compression mode (fast, normal; normal)\n"
+"                        nice=NUM   nice length of a match (2-273; 64)\n"
+"                        mf=NAME    match finder (hc3, hc4, bt2, bt3, bt4; bt4)\n"
+"                        depth=NUM  maximum search depth; 0=automatic (default)"));
+#endif
+
+		puts(_(
+"\n"
+"  --x86[=OPTS]        x86 BCJ filter (32-bit and 64-bit)\n"
+"  --arm[=OPTS]        ARM BCJ filter\n"
+"  --armthumb[=OPTS]   ARM-Thumb BCJ filter\n"
+"  --arm64[=OPTS]      ARM64 BCJ filter\n"
+"  --powerpc[=OPTS]    PowerPC BCJ filter (big endian only)\n"
+"  --ia64[=OPTS]       IA-64 (Itanium) BCJ filter\n"
+"  --sparc[=OPTS]      SPARC BCJ filter\n"
+"                      Valid OPTS for all BCJ filters:\n"
+"                        start=NUM  start offset for conversions (default=0)"));
+
+#if defined(HAVE_ENCODER_DELTA) || defined(HAVE_DECODER_DELTA)
+		puts(_(
+"\n"
+"  --delta[=OPTS]      Delta filter; valid OPTS (valid values; default):\n"
+"                        dist=NUM   distance between bytes being subtracted\n"
+"                                   from each other (1-256; 1)"));
+#endif
+	}
+
+	if (long_help)
+		puts(_("\n Other options:\n"));
+
+	puts(_(
+"  -q, --quiet         suppress warnings; specify twice to suppress errors too\n"
+"  -v, --verbose       be verbose; specify twice for even more verbose"));
+
+	if (long_help) {
+		puts(_(
+"  -Q, --no-warn       make warnings not affect the exit status"));
+		puts(_(
+"      --robot         use machine-parsable messages (useful for scripts)"));
+		puts("");
+		puts(_(
+"      --info-memory   display the total amount of RAM and the currently active\n"
+"                      memory usage limits, and exit"));
+		puts(_(
+"  -h, --help          display the short help (lists only the basic options)\n"
+"  -H, --long-help     display this long help and exit"));
+	} else {
+		puts(_(
+"  -h, --help          display this short help and exit\n"
+"  -H, --long-help     display the long help (lists also the advanced options)"));
+	}
+
+	puts(_(
+"  -V, --version       display the version number and exit"));
+
+	puts(_("\nWith no FILE, or when FILE is -, read standard input.\n"));
+
+	// TRANSLATORS: This message indicates the bug reporting address
+	// for this package. Please add _another line_ saying
+	// "Report translation bugs to <...>\n" with the email or WWW
+	// address for translation bugs. Thanks.
+	printf(_("Report bugs to <%s> (in English or Finnish).\n"),
+			PACKAGE_BUGREPORT);
+	printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
+
+#if LZMA_VERSION_STABILITY != LZMA_VERSION_STABILITY_STABLE
+	puts(_(
+"THIS IS A DEVELOPMENT VERSION NOT INTENDED FOR PRODUCTION USE."));
+#endif
+
+	tuklib_exit(E_SUCCESS, E_ERROR, verbosity != V_SILENT);
+}
diff --git a/src/xz/message.h b/src/xz/message.h
new file mode 100644
index 0000000..b264f82
--- /dev/null
+++ b/src/xz/message.h
@@ -0,0 +1,152 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       message.h
+/// \brief      Printing messages to stderr
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+/// Verbosity levels
+enum message_verbosity {
+	V_SILENT,   ///< No messages
+	V_ERROR,    ///< Only error messages
+	V_WARNING,  ///< Errors and warnings
+	V_VERBOSE,  ///< Errors, warnings, and verbose statistics
+	V_DEBUG,    ///< Very verbose
+};
+
+
+/// \brief      Signals used for progress message handling
+extern const int message_progress_sigs[];
+
+
+/// \brief      Initializes the message functions
+///
+/// If an error occurs, this function doesn't return.
+///
+extern void message_init(void);
+
+
+/// Increase verbosity level by one step unless it was at maximum.
+extern void message_verbosity_increase(void);
+
+/// Decrease verbosity level by one step unless it was at minimum.
+extern void message_verbosity_decrease(void);
+
+/// Get the current verbosity level.
+extern enum message_verbosity message_verbosity_get(void);
+
+
+/// \brief      Print a message if verbosity level is at least "verbosity"
+///
+/// This doesn't touch the exit status.
+extern void message(enum message_verbosity verbosity, const char *fmt, ...)
+		lzma_attribute((__format__(__printf__, 2, 3)));
+
+
+/// \brief      Prints a warning and possibly sets exit status
+///
+/// The message is printed only if verbosity level is at least V_WARNING.
+/// The exit status is set to WARNING unless it was already at ERROR.
+extern void message_warning(const char *fmt, ...)
+		lzma_attribute((__format__(__printf__, 1, 2)));
+
+
+/// \brief      Prints an error message and sets exit status
+///
+/// The message is printed only if verbosity level is at least V_ERROR.
+/// The exit status is set to ERROR.
+extern void message_error(const char *fmt, ...)
+		lzma_attribute((__format__(__printf__, 1, 2)));
+
+
+/// \brief      Prints an error message and exits with EXIT_ERROR
+///
+/// The message is printed only if verbosity level is at least V_ERROR.
+extern void message_fatal(const char *fmt, ...)
+		lzma_attribute((__format__(__printf__, 1, 2)))
+		lzma_attribute((__noreturn__));
+
+
+/// Print an error message that an internal error occurred and exit with
+/// EXIT_ERROR.
+extern void message_bug(void) lzma_attribute((__noreturn__));
+
+
+/// Print a message that establishing signal handlers failed, and exit with
+/// exit status ERROR.
+extern void message_signal_handler(void) lzma_attribute((__noreturn__));
+
+
+/// Convert lzma_ret to a string.
+extern const char *message_strm(lzma_ret code);
+
+
+/// Display how much memory was needed and how much the limit was.
+extern void message_mem_needed(enum message_verbosity v, uint64_t memusage);
+
+
+/// Print the filter chain.
+extern void message_filters_show(
+		enum message_verbosity v, const lzma_filter *filters);
+
+
+/// Print a message that user should try --help.
+extern void message_try_help(void);
+
+
+/// Prints the version number to stdout and exits with exit status SUCCESS.
+extern void message_version(void) lzma_attribute((__noreturn__));
+
+
+/// Print the help message.
+extern void message_help(bool long_help) lzma_attribute((__noreturn__));
+
+
+/// \brief      Set the total number of files to be processed
+///
+/// Standard input is counted as a file here. This is used when printing
+/// the filename via message_filename().
+extern void message_set_files(unsigned int files);
+
+
+/// \brief      Set the name of the current file and possibly print it too
+///
+/// The name is printed immediately if --list was used or if --verbose
+/// was used and stderr is a terminal. Even when the filename isn't printed,
+/// it is stored so that it can be printed later if needed for progress
+/// messages.
+extern void message_filename(const char *src_name);
+
+
+/// \brief      Start progress info handling
+///
+/// message_filename() must be called before this function to set
+/// the filename.
+///
+/// This must be paired with a call to message_progress_end() before the
+/// given *strm becomes invalid.
+///
+/// \param      strm      Pointer to lzma_stream used for the coding.
+/// \param      in_size   Size of the input file, or zero if unknown.
+///
+extern void message_progress_start(lzma_stream *strm,
+		bool is_passthru, uint64_t in_size);
+
+
+/// Update the progress info if in verbose mode and enough time has passed
+/// since the previous update. This can be called only when
+/// message_progress_start() has already been used.
+extern void message_progress_update(void);
+
+
+/// \brief      Finishes the progress message if we were in verbose mode
+///
+/// \param      finished    True if the whole stream was successfully coded
+///                         and output written to the output stream.
+///
+extern void message_progress_end(bool finished);
diff --git a/src/xz/mytime.c b/src/xz/mytime.c
new file mode 100644
index 0000000..7e8a074
--- /dev/null
+++ b/src/xz/mytime.c
@@ -0,0 +1,86 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       mytime.c
+/// \brief      Time handling functions
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+
+#if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_CLOCK_MONOTONIC)
+#	include <time.h>
+#else
+#	include <sys/time.h>
+#endif
+
+uint64_t opt_flush_timeout = 0;
+
+static uint64_t start_time;
+static uint64_t next_flush;
+
+
+/// \brief      Get the current time as milliseconds
+///
+/// It's relative to some point but not necessarily to the UNIX Epoch.
+static uint64_t
+mytime_now(void)
+{
+#if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_CLOCK_MONOTONIC)
+	// If CLOCK_MONOTONIC was available at compile time but for some
+	// reason isn't at runtime, fallback to CLOCK_REALTIME which
+	// according to POSIX is mandatory for all implementations.
+	static clockid_t clk_id = CLOCK_MONOTONIC;
+	struct timespec tv;
+	while (clock_gettime(clk_id, &tv))
+		clk_id = CLOCK_REALTIME;
+
+	return (uint64_t)tv.tv_sec * 1000 + (uint64_t)(tv.tv_nsec / 1000000);
+#else
+	struct timeval tv;
+	gettimeofday(&tv, NULL);
+	return (uint64_t)tv.tv_sec * 1000 + (uint64_t)(tv.tv_usec / 1000);
+#endif
+}
+
+
+extern void
+mytime_set_start_time(void)
+{
+	start_time = mytime_now();
+	return;
+}
+
+
+extern uint64_t
+mytime_get_elapsed(void)
+{
+	return mytime_now() - start_time;
+}
+
+
+extern void
+mytime_set_flush_time(void)
+{
+	next_flush = mytime_now() + opt_flush_timeout;
+	return;
+}
+
+
+extern int
+mytime_get_flush_timeout(void)
+{
+	if (opt_flush_timeout == 0 || opt_mode != MODE_COMPRESS)
+		return -1;
+
+	const uint64_t now = mytime_now();
+	if (now >= next_flush)
+		return 0;
+
+	const uint64_t remaining = next_flush - now;
+	return remaining > INT_MAX ? INT_MAX : (int)remaining;
+}
diff --git a/src/xz/mytime.h b/src/xz/mytime.h
new file mode 100644
index 0000000..a7be2aa
--- /dev/null
+++ b/src/xz/mytime.h
@@ -0,0 +1,43 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       mytime.h
+/// \brief      Time handling functions
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+
+/// \brief      Number of milliseconds to between LZMA_SYNC_FLUSHes
+///
+/// If 0, timed flushing is disabled. Otherwise if no more input is available
+/// and not at the end of the file and at least opt_flush_timeout milliseconds
+/// has elapsed since the start of compression or the previous flushing
+/// (LZMA_SYNC_FLUSH or LZMA_FULL_FLUSH), set LZMA_SYNC_FLUSH to flush
+/// the pending data.
+extern uint64_t opt_flush_timeout;
+
+
+/// \brief      Store the time when (de)compression was started
+///
+/// The start time is also stored as the time of the first flush.
+extern void mytime_set_start_time(void);
+
+
+/// \brief      Get the number of milliseconds since the operation started
+extern uint64_t mytime_get_elapsed(void);
+
+
+/// \brief      Store the time of when compressor was flushed
+extern void mytime_set_flush_time(void);
+
+
+/// \brief      Get the number of milliseconds until the next flush
+///
+/// This returns -1 if no timed flushing is used.
+///
+/// The return value is intended for use with poll().
+extern int mytime_get_flush_timeout(void);
diff --git a/src/xz/options.c b/src/xz/options.c
new file mode 100644
index 0000000..b434b0c
--- /dev/null
+++ b/src/xz/options.c
@@ -0,0 +1,358 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       options.c
+/// \brief      Parser for filter-specific options
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+
+
+///////////////////
+// Generic stuff //
+///////////////////
+
+typedef struct {
+	const char *name;
+	uint64_t id;
+} name_id_map;
+
+
+typedef struct {
+	const char *name;
+	const name_id_map *map;
+	uint64_t min;
+	uint64_t max;
+} option_map;
+
+
+/// Parses option=value pairs that are separated with commas:
+/// opt=val,opt=val,opt=val
+///
+/// Each option is a string, that is converted to an integer using the
+/// index where the option string is in the array.
+///
+/// Value can be
+///  - a string-id map mapping a list of possible string values to integers
+///    (opts[i].map != NULL, opts[i].min and opts[i].max are ignored);
+///  - a number with minimum and maximum value limit
+///    (opts[i].map == NULL && opts[i].min != UINT64_MAX);
+///  - a string that will be parsed by the filter-specific code
+///    (opts[i].map == NULL && opts[i].min == UINT64_MAX, opts[i].max ignored)
+///
+/// When parsing both option and value succeed, a filter-specific function
+/// is called, which should update the given value to filter-specific
+/// options structure.
+///
+/// \param      str     String containing the options from the command line
+/// \param      opts    Filter-specific option map
+/// \param      set     Filter-specific function to update filter_options
+/// \param      filter_options  Pointer to filter-specific options structure
+///
+/// \return     Returns only if no errors occur.
+///
+static void
+parse_options(const char *str, const option_map *opts,
+		void (*set)(void *filter_options,
+			unsigned key, uint64_t value, const char *valuestr),
+		void *filter_options)
+{
+	if (str == NULL || str[0] == '\0')
+		return;
+
+	char *s = xstrdup(str);
+	char *name = s;
+
+	while (*name != '\0') {
+		if (*name == ',') {
+			++name;
+			continue;
+		}
+
+		char *split = strchr(name, ',');
+		if (split != NULL)
+			*split = '\0';
+
+		char *value = strchr(name, '=');
+		if (value != NULL)
+			*value++ = '\0';
+
+		if (value == NULL || value[0] == '\0')
+			message_fatal(_("%s: Options must be `name=value' "
+					"pairs separated with commas"), str);
+
+		// Look for the option name from the option map.
+		unsigned i = 0;
+		while (true) {
+			if (opts[i].name == NULL)
+				message_fatal(_("%s: Invalid option name"),
+						name);
+
+			if (strcmp(name, opts[i].name) == 0)
+				break;
+
+			++i;
+		}
+
+		// Option was found from the map. See how we should handle it.
+		if (opts[i].map != NULL) {
+			// value is a string which we should map
+			// to an integer.
+			unsigned j;
+			for (j = 0; opts[i].map[j].name != NULL; ++j) {
+				if (strcmp(opts[i].map[j].name, value) == 0)
+					break;
+			}
+
+			if (opts[i].map[j].name == NULL)
+				message_fatal(_("%s: Invalid option value"),
+						value);
+
+			set(filter_options, i, opts[i].map[j].id, value);
+
+		} else if (opts[i].min == UINT64_MAX) {
+			// value is a special string that will be
+			// parsed by set().
+			set(filter_options, i, 0, value);
+
+		} else {
+			// value is an integer.
+			const uint64_t v = str_to_uint64(name, value,
+					opts[i].min, opts[i].max);
+			set(filter_options, i, v, value);
+		}
+
+		// Check if it was the last option.
+		if (split == NULL)
+			break;
+
+		name = split + 1;
+	}
+
+	free(s);
+	return;
+}
+
+
+///////////
+// Delta //
+///////////
+
+enum {
+	OPT_DIST,
+};
+
+
+static void
+set_delta(void *options, unsigned key, uint64_t value,
+		const char *valuestr lzma_attribute((__unused__)))
+{
+	lzma_options_delta *opt = options;
+	switch (key) {
+	case OPT_DIST:
+		opt->dist = value;
+		break;
+	}
+}
+
+
+extern lzma_options_delta *
+options_delta(const char *str)
+{
+	static const option_map opts[] = {
+		{ "dist",     NULL,  LZMA_DELTA_DIST_MIN,
+		                     LZMA_DELTA_DIST_MAX },
+		{ NULL,       NULL,  0, 0 }
+	};
+
+	lzma_options_delta *options = xmalloc(sizeof(lzma_options_delta));
+	*options = (lzma_options_delta){
+		// It's hard to give a useful default for this.
+		.type = LZMA_DELTA_TYPE_BYTE,
+		.dist = LZMA_DELTA_DIST_MIN,
+	};
+
+	parse_options(str, opts, &set_delta, options);
+
+	return options;
+}
+
+
+/////////
+// BCJ //
+/////////
+
+enum {
+	OPT_START_OFFSET,
+};
+
+
+static void
+set_bcj(void *options, unsigned key, uint64_t value,
+		const char *valuestr lzma_attribute((__unused__)))
+{
+	lzma_options_bcj *opt = options;
+	switch (key) {
+	case OPT_START_OFFSET:
+		opt->start_offset = value;
+		break;
+	}
+}
+
+
+extern lzma_options_bcj *
+options_bcj(const char *str)
+{
+	static const option_map opts[] = {
+		{ "start",    NULL,  0, UINT32_MAX },
+		{ NULL,       NULL,  0, 0 }
+	};
+
+	lzma_options_bcj *options = xmalloc(sizeof(lzma_options_bcj));
+	*options = (lzma_options_bcj){
+		.start_offset = 0,
+	};
+
+	parse_options(str, opts, &set_bcj, options);
+
+	return options;
+}
+
+
+//////////
+// LZMA //
+//////////
+
+enum {
+	OPT_PRESET,
+	OPT_DICT,
+	OPT_LC,
+	OPT_LP,
+	OPT_PB,
+	OPT_MODE,
+	OPT_NICE,
+	OPT_MF,
+	OPT_DEPTH,
+};
+
+
+static void lzma_attribute((__noreturn__))
+error_lzma_preset(const char *valuestr)
+{
+	message_fatal(_("Unsupported LZMA1/LZMA2 preset: %s"), valuestr);
+}
+
+
+static void
+set_lzma(void *options, unsigned key, uint64_t value, const char *valuestr)
+{
+	lzma_options_lzma *opt = options;
+
+	switch (key) {
+	case OPT_PRESET: {
+		if (valuestr[0] < '0' || valuestr[0] > '9')
+			error_lzma_preset(valuestr);
+
+		uint32_t preset = (uint32_t)(valuestr[0] - '0');
+
+		// Currently only "e" is supported as a modifier,
+		// so keep this simple for now.
+		if (valuestr[1] != '\0') {
+			if (valuestr[1] == 'e')
+				preset |= LZMA_PRESET_EXTREME;
+			else
+				error_lzma_preset(valuestr);
+
+			if (valuestr[2] != '\0')
+				error_lzma_preset(valuestr);
+		}
+
+		if (lzma_lzma_preset(options, preset))
+			error_lzma_preset(valuestr);
+
+		break;
+	}
+
+	case OPT_DICT:
+		opt->dict_size = value;
+		break;
+
+	case OPT_LC:
+		opt->lc = value;
+		break;
+
+	case OPT_LP:
+		opt->lp = value;
+		break;
+
+	case OPT_PB:
+		opt->pb = value;
+		break;
+
+	case OPT_MODE:
+		opt->mode = value;
+		break;
+
+	case OPT_NICE:
+		opt->nice_len = value;
+		break;
+
+	case OPT_MF:
+		opt->mf = value;
+		break;
+
+	case OPT_DEPTH:
+		opt->depth = value;
+		break;
+	}
+}
+
+
+extern lzma_options_lzma *
+options_lzma(const char *str)
+{
+	static const name_id_map modes[] = {
+		{ "fast",   LZMA_MODE_FAST },
+		{ "normal", LZMA_MODE_NORMAL },
+		{ NULL,     0 }
+	};
+
+	static const name_id_map mfs[] = {
+		{ "hc3", LZMA_MF_HC3 },
+		{ "hc4", LZMA_MF_HC4 },
+		{ "bt2", LZMA_MF_BT2 },
+		{ "bt3", LZMA_MF_BT3 },
+		{ "bt4", LZMA_MF_BT4 },
+		{ NULL,  0 }
+	};
+
+	static const option_map opts[] = {
+		{ "preset", NULL,   UINT64_MAX, 0 },
+		{ "dict",   NULL,   LZMA_DICT_SIZE_MIN,
+				(UINT32_C(1) << 30) + (UINT32_C(1) << 29) },
+		{ "lc",     NULL,   LZMA_LCLP_MIN, LZMA_LCLP_MAX },
+		{ "lp",     NULL,   LZMA_LCLP_MIN, LZMA_LCLP_MAX },
+		{ "pb",     NULL,   LZMA_PB_MIN, LZMA_PB_MAX },
+		{ "mode",   modes,  0, 0 },
+		{ "nice",   NULL,   2, 273 },
+		{ "mf",     mfs,    0, 0 },
+		{ "depth",  NULL,   0, UINT32_MAX },
+		{ NULL,     NULL,   0, 0 }
+	};
+
+	lzma_options_lzma *options = xmalloc(sizeof(lzma_options_lzma));
+	if (lzma_lzma_preset(options, LZMA_PRESET_DEFAULT))
+		message_bug();
+
+	parse_options(str, opts, &set_lzma, options);
+
+	if (options->lc + options->lp > LZMA_LCLP_MAX)
+		message_fatal(_("The sum of lc and lp must not exceed 4"));
+
+	return options;
+}
diff --git a/src/xz/options.h b/src/xz/options.h
new file mode 100644
index 0000000..61ec8d5
--- /dev/null
+++ b/src/xz/options.h
@@ -0,0 +1,31 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       options.h
+/// \brief      Parser for filter-specific options
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+/// \brief      Parser for Delta options
+///
+/// \return     Pointer to allocated options structure.
+///             Doesn't return on error.
+extern lzma_options_delta *options_delta(const char *str);
+
+
+/// \brief      Parser for BCJ options
+///
+/// \return     Pointer to allocated options structure.
+///             Doesn't return on error.
+extern lzma_options_bcj *options_bcj(const char *str);
+
+
+/// \brief      Parser for LZMA options
+///
+/// \return     Pointer to allocated options structure.
+///             Doesn't return on error.
+extern lzma_options_lzma *options_lzma(const char *str);
diff --git a/src/xz/private.h b/src/xz/private.h
new file mode 100644
index 0000000..6414bdb
--- /dev/null
+++ b/src/xz/private.h
@@ -0,0 +1,66 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       private.h
+/// \brief      Common includes, definitions, and prototypes
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "sysdefs.h"
+#include "mythread.h"
+
+#include "lzma.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <signal.h>
+#include <locale.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "tuklib_gettext.h"
+#include "tuklib_progname.h"
+#include "tuklib_exit.h"
+#include "tuklib_mbstr.h"
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#	define WIN32_LEAN_AND_MEAN
+#	include <windows.h>
+#endif
+
+#ifndef STDIN_FILENO
+#	define STDIN_FILENO (fileno(stdin))
+#endif
+
+#ifndef STDOUT_FILENO
+#	define STDOUT_FILENO (fileno(stdout))
+#endif
+
+#ifndef STDERR_FILENO
+#	define STDERR_FILENO (fileno(stderr))
+#endif
+
+#if defined(HAVE_CAPSICUM) || defined(HAVE_PLEDGE)
+#	define ENABLE_SANDBOX 1
+#endif
+
+#include "main.h"
+#include "mytime.h"
+#include "coder.h"
+#include "message.h"
+#include "args.h"
+#include "hardware.h"
+#include "file_io.h"
+#include "options.h"
+#include "signals.h"
+#include "suffix.h"
+#include "util.h"
+
+#ifdef HAVE_DECODERS
+#	include "list.h"
+#endif
diff --git a/src/xz/signals.c b/src/xz/signals.c
new file mode 100644
index 0000000..7aef463
--- /dev/null
+++ b/src/xz/signals.c
@@ -0,0 +1,209 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       signals.c
+/// \brief      Handling signals to abort operation
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+
+
+volatile sig_atomic_t user_abort = false;
+
+
+#if !(defined(_WIN32) && !defined(__CYGWIN__))
+
+/// If we were interrupted by a signal, we store the signal number so that
+/// we can raise that signal to kill the program when all cleanups have
+/// been done.
+static volatile sig_atomic_t exit_signal = 0;
+
+/// Mask of signals for which we have established a signal handler to set
+/// user_abort to true.
+static sigset_t hooked_signals;
+
+/// True once signals_init() has finished. This is used to skip blocking
+/// signals (with uninitialized hooked_signals) if signals_block() and
+/// signals_unblock() are called before signals_init() has been called.
+static bool signals_are_initialized = false;
+
+/// signals_block() and signals_unblock() can be called recursively.
+static size_t signals_block_count = 0;
+
+
+static void
+signal_handler(int sig)
+{
+	exit_signal = sig;
+	user_abort = true;
+
+#ifndef TUKLIB_DOSLIKE
+	io_write_to_user_abort_pipe();
+#endif
+
+	return;
+}
+
+
+extern void
+signals_init(void)
+{
+	// List of signals for which we establish the signal handler.
+	static const int sigs[] = {
+		SIGINT,
+		SIGTERM,
+#ifdef SIGHUP
+		SIGHUP,
+#endif
+#ifdef SIGPIPE
+		SIGPIPE,
+#endif
+#ifdef SIGXCPU
+		SIGXCPU,
+#endif
+#ifdef SIGXFSZ
+		SIGXFSZ,
+#endif
+	};
+
+	// Mask of the signals for which we have established a signal handler.
+	sigemptyset(&hooked_signals);
+	for (size_t i = 0; i < ARRAY_SIZE(sigs); ++i)
+		sigaddset(&hooked_signals, sigs[i]);
+
+#ifdef SIGALRM
+	// Add also the signals from message.c to hooked_signals.
+	for (size_t i = 0; message_progress_sigs[i] != 0; ++i)
+		sigaddset(&hooked_signals, message_progress_sigs[i]);
+#endif
+
+	// Using "my_sa" because "sa" may conflict with a sockaddr variable
+	// from system headers on Solaris.
+	struct sigaction my_sa;
+
+	// All the signals that we handle we also blocked while the signal
+	// handler runs.
+	my_sa.sa_mask = hooked_signals;
+
+	// Don't set SA_RESTART, because we want EINTR so that we can check
+	// for user_abort and cleanup before exiting. We block the signals
+	// for which we have established a handler when we don't want EINTR.
+	my_sa.sa_flags = 0;
+	my_sa.sa_handler = &signal_handler;
+
+	for (size_t i = 0; i < ARRAY_SIZE(sigs); ++i) {
+		// If the parent process has left some signals ignored,
+		// we don't unignore them.
+		struct sigaction old;
+		if (sigaction(sigs[i], NULL, &old) == 0
+				&& old.sa_handler == SIG_IGN)
+			continue;
+
+		// Establish the signal handler.
+		if (sigaction(sigs[i], &my_sa, NULL))
+			message_signal_handler();
+	}
+
+	signals_are_initialized = true;
+
+	return;
+}
+
+
+#ifndef __VMS
+extern void
+signals_block(void)
+{
+	if (signals_are_initialized) {
+		if (signals_block_count++ == 0) {
+			const int saved_errno = errno;
+			mythread_sigmask(SIG_BLOCK, &hooked_signals, NULL);
+			errno = saved_errno;
+		}
+	}
+
+	return;
+}
+
+
+extern void
+signals_unblock(void)
+{
+	if (signals_are_initialized) {
+		assert(signals_block_count > 0);
+
+		if (--signals_block_count == 0) {
+			const int saved_errno = errno;
+			mythread_sigmask(SIG_UNBLOCK, &hooked_signals, NULL);
+			errno = saved_errno;
+		}
+	}
+
+	return;
+}
+#endif
+
+
+extern void
+signals_exit(void)
+{
+	const int sig = (int)exit_signal;
+
+	if (sig != 0) {
+#if defined(TUKLIB_DOSLIKE) || defined(__VMS)
+		// Don't raise(), set only exit status. This avoids
+		// printing unwanted message about SIGINT when the user
+		// presses C-c.
+		set_exit_status(E_ERROR);
+#else
+		struct sigaction sa;
+		sa.sa_handler = SIG_DFL;
+		sigfillset(&sa.sa_mask);
+		sa.sa_flags = 0;
+		sigaction(sig, &sa, NULL);
+		raise(sig);
+#endif
+	}
+
+	return;
+}
+
+#else
+
+// While Windows has some very basic signal handling functions as required
+// by C89, they are not really used, and e.g. SIGINT doesn't work exactly
+// the way it does on POSIX (Windows creates a new thread for the signal
+// handler). Instead, we use SetConsoleCtrlHandler() to catch user
+// pressing C-c, because that seems to be the recommended way to do it.
+//
+// NOTE: This doesn't work under MSYS. Trying with SIGINT doesn't work
+// either even if it appeared to work at first. So test using Windows
+// console window.
+
+static BOOL WINAPI
+signal_handler(DWORD type lzma_attribute((__unused__)))
+{
+	// Since we don't get a signal number which we could raise() at
+	// signals_exit() like on POSIX, just set the exit status to
+	// indicate an error, so that we cannot return with zero exit status.
+	set_exit_status(E_ERROR);
+	user_abort = true;
+	return TRUE;
+}
+
+
+extern void
+signals_init(void)
+{
+	if (!SetConsoleCtrlHandler(&signal_handler, TRUE))
+		message_signal_handler();
+
+	return;
+}
+
+#endif
diff --git a/src/xz/signals.h b/src/xz/signals.h
new file mode 100644
index 0000000..5b125e0
--- /dev/null
+++ b/src/xz/signals.h
@@ -0,0 +1,43 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       signals.h
+/// \brief      Handling signals to abort operation
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+/// If this is true, we will clean up the possibly incomplete output file,
+/// return to main() as soon as practical. That is, the code needs to poll
+/// this variable in various places.
+extern volatile sig_atomic_t user_abort;
+
+
+/// Initialize the signal handler, which will set user_abort to true when
+/// user e.g. presses C-c.
+extern void signals_init(void);
+
+
+#if (defined(_WIN32) && !defined(__CYGWIN__)) || defined(__VMS)
+#	define signals_block() do { } while (0)
+#	define signals_unblock() do { } while (0)
+#else
+/// Block the signals which don't have SA_RESTART and which would just set
+/// user_abort to true. This is handy when we don't want to handle EINTR
+/// and don't want SA_RESTART either.
+extern void signals_block(void);
+
+/// Unblock the signals blocked by signals_block().
+extern void signals_unblock(void);
+#endif
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#	define signals_exit() do { } while (0)
+#else
+/// If user has sent us a signal earlier to terminate the process,
+/// re-raise that signal to actually terminate the process.
+extern void signals_exit(void);
+#endif
diff --git a/src/xz/suffix.c b/src/xz/suffix.c
new file mode 100644
index 0000000..09add38
--- /dev/null
+++ b/src/xz/suffix.c
@@ -0,0 +1,411 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       suffix.c
+/// \brief      Checks filename suffix and creates the destination filename
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+
+#ifdef __DJGPP__
+#	include <fcntl.h>
+#endif
+
+// For case-insensitive filename suffix on case-insensitive systems
+#if defined(TUKLIB_DOSLIKE) || defined(__VMS)
+#	ifdef HAVE_STRINGS_H
+#		include <strings.h>
+#	endif
+#	define strcmp strcasecmp
+#endif
+
+
+static char *custom_suffix = NULL;
+
+
+/// \brief      Test if the char is a directory separator
+static bool
+is_dir_sep(char c)
+{
+#ifdef TUKLIB_DOSLIKE
+	return c == '/' || c == '\\' || c == ':';
+#else
+	return c == '/';
+#endif
+}
+
+
+/// \brief      Test if the string contains a directory separator
+static bool
+has_dir_sep(const char *str)
+{
+#ifdef TUKLIB_DOSLIKE
+	return strpbrk(str, "/\\:") != NULL;
+#else
+	return strchr(str, '/') != NULL;
+#endif
+}
+
+
+#ifdef __DJGPP__
+/// \brief      Test for special suffix used for 8.3 short filenames (SFN)
+///
+/// \return     If str matches *.?- or *.??-, true is returned. Otherwise
+///             false is returned.
+static bool
+has_sfn_suffix(const char *str, size_t len)
+{
+	if (len >= 4 && str[len - 1] == '-' && str[len - 2] != '.'
+			&& !is_dir_sep(str[len - 2])) {
+		// *.?-
+		if (str[len - 3] == '.')
+			return !is_dir_sep(str[len - 4]);
+
+		// *.??-
+		if (len >= 5 && !is_dir_sep(str[len - 3])
+				&& str[len - 4] == '.')
+			return !is_dir_sep(str[len - 5]);
+	}
+
+	return false;
+}
+#endif
+
+
+/// \brief      Checks if src_name has given compressed_suffix
+///
+/// \param      suffix      Filename suffix to look for
+/// \param      src_name    Input filename
+/// \param      src_len     strlen(src_name)
+///
+/// \return     If src_name has the suffix, src_len - strlen(suffix) is
+///             returned. It's always a positive integer. Otherwise zero
+///             is returned.
+static size_t
+test_suffix(const char *suffix, const char *src_name, size_t src_len)
+{
+	const size_t suffix_len = strlen(suffix);
+
+	// The filename must have at least one character in addition to
+	// the suffix. src_name may contain path to the filename, so we
+	// need to check for directory separator too.
+	if (src_len <= suffix_len
+			|| is_dir_sep(src_name[src_len - suffix_len - 1]))
+		return 0;
+
+	if (strcmp(suffix, src_name + src_len - suffix_len) == 0)
+		return src_len - suffix_len;
+
+	return 0;
+}
+
+
+/// \brief      Removes the filename suffix of the compressed file
+///
+/// \return     Name of the uncompressed file, or NULL if file has unknown
+///             suffix.
+static char *
+uncompressed_name(const char *src_name, const size_t src_len)
+{
+	static const struct {
+		const char *compressed;
+		const char *uncompressed;
+	} suffixes[] = {
+		{ ".xz",    "" },
+		{ ".txz",   ".tar" }, // .txz abbreviation for .txt.gz is rare.
+		{ ".lzma",  "" },
+#ifdef __DJGPP__
+		{ ".lzm",   "" },
+#endif
+		{ ".tlz",   ".tar" }, // Both .tar.lzma and .tar.lz
+#ifdef HAVE_LZIP_DECODER
+		{ ".lz",    "" },
+#endif
+	};
+
+	const char *new_suffix = "";
+	size_t new_len = 0;
+
+	if (opt_format == FORMAT_RAW) {
+		// Don't check for known suffixes when --format=raw was used.
+		if (custom_suffix == NULL) {
+			message_error(_("%s: With --format=raw, "
+					"--suffix=.SUF is required unless "
+					"writing to stdout"), src_name);
+			return NULL;
+		}
+	} else {
+		for (size_t i = 0; i < ARRAY_SIZE(suffixes); ++i) {
+			new_len = test_suffix(suffixes[i].compressed,
+					src_name, src_len);
+			if (new_len != 0) {
+				new_suffix = suffixes[i].uncompressed;
+				break;
+			}
+		}
+
+#ifdef __DJGPP__
+		// Support also *.?- -> *.? and *.??- -> *.?? on DOS.
+		// This is done also when long filenames are available
+		// to keep it easy to decompress files created when
+		// long filename support wasn't available.
+		if (new_len == 0 && has_sfn_suffix(src_name, src_len)) {
+			new_suffix = "";
+			new_len = src_len - 1;
+		}
+#endif
+	}
+
+	if (new_len == 0 && custom_suffix != NULL)
+		new_len = test_suffix(custom_suffix, src_name, src_len);
+
+	if (new_len == 0) {
+		message_warning(_("%s: Filename has an unknown suffix, "
+				"skipping"), src_name);
+		return NULL;
+	}
+
+	const size_t new_suffix_len = strlen(new_suffix);
+	char *dest_name = xmalloc(new_len + new_suffix_len + 1);
+
+	memcpy(dest_name, src_name, new_len);
+	memcpy(dest_name + new_len, new_suffix, new_suffix_len);
+	dest_name[new_len + new_suffix_len] = '\0';
+
+	return dest_name;
+}
+
+
+/// This message is needed in multiple places in compressed_name(),
+/// so the message has been put into its own function.
+static void
+msg_suffix(const char *src_name, const char *suffix)
+{
+	message_warning(_("%s: File already has `%s' suffix, skipping"),
+			src_name, suffix);
+	return;
+}
+
+
+/// \brief      Appends suffix to src_name
+///
+/// In contrast to uncompressed_name(), we check only suffixes that are valid
+/// for the specified file format.
+static char *
+compressed_name(const char *src_name, size_t src_len)
+{
+	// The order of these must match the order in args.h.
+	static const char *const all_suffixes[][4] = {
+		{
+			".xz",
+			".txz",
+			NULL
+		}, {
+			".lzma",
+#ifdef __DJGPP__
+			".lzm",
+#endif
+			".tlz",
+			NULL
+#ifdef HAVE_LZIP_DECODER
+		// This is needed to keep the table indexing in sync with
+		// enum format_type from coder.h.
+		}, {
+/*
+			".lz",
+*/
+			NULL
+#endif
+		}, {
+			// --format=raw requires specifying the suffix
+			// manually or using stdout.
+			NULL
+		}
+	};
+
+	// args.c ensures these.
+	assert(opt_format != FORMAT_AUTO);
+#ifdef HAVE_LZIP_DECODER
+	assert(opt_format != FORMAT_LZIP);
+#endif
+
+	const size_t format = opt_format - 1;
+	const char *const *suffixes = all_suffixes[format];
+
+	// Look for known filename suffixes and refuse to compress them.
+	for (size_t i = 0; suffixes[i] != NULL; ++i) {
+		if (test_suffix(suffixes[i], src_name, src_len) != 0) {
+			msg_suffix(src_name, suffixes[i]);
+			return NULL;
+		}
+	}
+
+#ifdef __DJGPP__
+	// Recognize also the special suffix that is used when long
+	// filename (LFN) support isn't available. This suffix is
+	// recognized on LFN systems too.
+	if (opt_format == FORMAT_XZ && has_sfn_suffix(src_name, src_len)) {
+		msg_suffix(src_name, "-");
+		return NULL;
+	}
+#endif
+
+	if (custom_suffix != NULL) {
+		if (test_suffix(custom_suffix, src_name, src_len) != 0) {
+			msg_suffix(src_name, custom_suffix);
+			return NULL;
+		}
+	}
+
+	// TODO: Hmm, maybe it would be better to validate this in args.c,
+	// since the suffix handling when decoding is weird now.
+	if (opt_format == FORMAT_RAW && custom_suffix == NULL) {
+		message_error(_("%s: With --format=raw, "
+				"--suffix=.SUF is required unless "
+				"writing to stdout"), src_name);
+		return NULL;
+	}
+
+	const char *suffix = custom_suffix != NULL
+			? custom_suffix : suffixes[0];
+	size_t suffix_len = strlen(suffix);
+
+#ifdef __DJGPP__
+	if (!_use_lfn(src_name)) {
+		// Long filename (LFN) support isn't available and we are
+		// limited to 8.3 short filenames (SFN).
+		//
+		// Look for suffix separator from the filename, and make sure
+		// that it is in the filename, not in a directory name.
+		const char *sufsep = strrchr(src_name, '.');
+		if (sufsep == NULL || sufsep[1] == '\0'
+				|| has_dir_sep(sufsep)) {
+			// src_name has no filename extension.
+			//
+			// Examples:
+			// xz foo         -> foo.xz
+			// xz -F lzma foo -> foo.lzm
+			// xz -S x foo    -> foox
+			// xz -S x foo.   -> foo.x
+			// xz -S x.y foo  -> foox.y
+			// xz -S .x foo   -> foo.x
+			// xz -S .x foo.  -> foo.x
+			//
+			// Avoid double dots:
+			if (sufsep != NULL && sufsep[1] == '\0'
+					&& suffix[0] == '.')
+				--src_len;
+
+		} else if (custom_suffix == NULL
+				&& strcasecmp(sufsep, ".tar") == 0) {
+			// ".tar" is handled specially.
+			//
+			// Examples:
+			// xz foo.tar          -> foo.txz
+			// xz -F lzma foo.tar  -> foo.tlz
+			static const char *const tar_suffixes[] = {
+				".txz", // .tar.xz
+				".tlz", // .tar.lzma
+/*
+				".tlz", // .tar.lz
+*/
+			};
+			suffix = tar_suffixes[format];
+			suffix_len = 4;
+			src_len -= 4;
+
+		} else {
+			if (custom_suffix == NULL && opt_format == FORMAT_XZ) {
+				// Instead of the .xz suffix, use a single
+				// character at the end of the filename
+				// extension. This is to minimize name
+				// conflicts when compressing multiple files
+				// with the same basename. E.g. foo.txt and
+				// foo.exe become foo.tx- and foo.ex-. Dash
+				// is rare as the last character of the
+				// filename extension, so it seems to be
+				// quite safe choice and it stands out better
+				// in directory listings than e.g. x. For
+				// comparison, gzip uses z.
+				suffix = "-";
+				suffix_len = 1;
+			}
+
+			if (suffix[0] == '.') {
+				// The first character of the suffix is a dot.
+				// Throw away the original filename extension
+				// and replace it with the new suffix.
+				//
+				// Examples:
+				// xz -F lzma foo.txt  -> foo.lzm
+				// xz -S .x  foo.txt   -> foo.x
+				src_len = sufsep - src_name;
+
+			} else {
+				// The first character of the suffix is not
+				// a dot. Preserve the first 0-2 characters
+				// of the original filename extension.
+				//
+				// Examples:
+				// xz foo.txt         -> foo.tx-
+				// xz -S x  foo.c     -> foo.cx
+				// xz -S ab foo.c     -> foo.cab
+				// xz -S ab foo.txt   -> foo.tab
+				// xz -S abc foo.txt  -> foo.abc
+				//
+				// Truncate the suffix to three chars:
+				if (suffix_len > 3)
+					suffix_len = 3;
+
+				// If needed, overwrite 1-3 characters.
+				if (strlen(sufsep) > 4 - suffix_len)
+					src_len = sufsep - src_name
+							+ 4 - suffix_len;
+			}
+		}
+	}
+#endif
+
+	char *dest_name = xmalloc(src_len + suffix_len + 1);
+
+	memcpy(dest_name, src_name, src_len);
+	memcpy(dest_name + src_len, suffix, suffix_len);
+	dest_name[src_len + suffix_len] = '\0';
+
+	return dest_name;
+}
+
+
+extern char *
+suffix_get_dest_name(const char *src_name)
+{
+	assert(src_name != NULL);
+
+	// Length of the name is needed in all cases to locate the end of
+	// the string to compare the suffix, so calculate the length here.
+	const size_t src_len = strlen(src_name);
+
+	return opt_mode == MODE_COMPRESS
+			? compressed_name(src_name, src_len)
+			: uncompressed_name(src_name, src_len);
+}
+
+
+extern void
+suffix_set(const char *suffix)
+{
+	// Empty suffix and suffixes having a directory separator are
+	// rejected. Such suffixes would break things later.
+	if (suffix[0] == '\0' || has_dir_sep(suffix))
+		message_fatal(_("%s: Invalid filename suffix"), suffix);
+
+	// Replace the old custom_suffix (if any) with the new suffix.
+	free(custom_suffix);
+	custom_suffix = xstrdup(suffix);
+	return;
+}
diff --git a/src/xz/suffix.h b/src/xz/suffix.h
new file mode 100644
index 0000000..5537d73
--- /dev/null
+++ b/src/xz/suffix.h
@@ -0,0 +1,28 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       suffix.h
+/// \brief      Checks filename suffix and creates the destination filename
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+/// \brief      Get the name of the destination file
+///
+/// Depending on the global variable opt_mode, this tries to find a matching
+/// counterpart for src_name. If the name can be constructed, it is allocated
+/// and returned (caller must free it). On error, a message is printed and
+/// NULL is returned.
+extern char *suffix_get_dest_name(const char *src_name);
+
+
+/// \brief      Set a custom filename suffix
+///
+/// This function calls xstrdup() for the given suffix, thus the caller
+/// doesn't need to keep the memory allocated. There can be only one custom
+/// suffix, thus if this is called multiple times, the old suffixes are freed
+/// and forgotten.
+extern void suffix_set(const char *suffix);
diff --git a/src/xz/util.c b/src/xz/util.c
new file mode 100644
index 0000000..9f9a8fb
--- /dev/null
+++ b/src/xz/util.c
@@ -0,0 +1,286 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       util.c
+/// \brief      Miscellaneous utility functions
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+#include <stdarg.h>
+
+
+/// Buffers for uint64_to_str() and uint64_to_nicestr()
+static char bufs[4][128];
+
+/// Thousand separator support in uint64_to_str() and uint64_to_nicestr()
+static enum { UNKNOWN, WORKS, BROKEN } thousand = UNKNOWN;
+
+
+extern void *
+xrealloc(void *ptr, size_t size)
+{
+	assert(size > 0);
+
+	// Save ptr so that we can free it if realloc fails.
+	// The point is that message_fatal ends up calling stdio functions
+	// which in some libc implementations might allocate memory from
+	// the heap. Freeing ptr improves the chances that there's free
+	// memory for stdio functions if they need it.
+	void *p = ptr;
+	ptr = realloc(ptr, size);
+
+	if (ptr == NULL) {
+		const int saved_errno = errno;
+		free(p);
+		message_fatal("%s", strerror(saved_errno));
+	}
+
+	return ptr;
+}
+
+
+extern char *
+xstrdup(const char *src)
+{
+	assert(src != NULL);
+	const size_t size = strlen(src) + 1;
+	char *dest = xmalloc(size);
+	return memcpy(dest, src, size);
+}
+
+
+extern uint64_t
+str_to_uint64(const char *name, const char *value, uint64_t min, uint64_t max)
+{
+	uint64_t result = 0;
+
+	// Skip blanks.
+	while (*value == ' ' || *value == '\t')
+		++value;
+
+	// Accept special value "max". Supporting "min" doesn't seem useful.
+	if (strcmp(value, "max") == 0)
+		return max;
+
+	if (*value < '0' || *value > '9')
+		message_fatal(_("%s: Value is not a non-negative "
+				"decimal integer"), value);
+
+	do {
+		// Don't overflow.
+		if (result > UINT64_MAX / 10)
+			goto error;
+
+		result *= 10;
+
+		// Another overflow check
+		const uint32_t add = (uint32_t)(*value - '0');
+		if (UINT64_MAX - add < result)
+			goto error;
+
+		result += add;
+		++value;
+	} while (*value >= '0' && *value <= '9');
+
+	if (*value != '\0') {
+		// Look for suffix. Originally this supported both base-2
+		// and base-10, but since there seems to be little need
+		// for base-10 in this program, treat everything as base-2
+		// and also be more relaxed about the case of the first
+		// letter of the suffix.
+		uint64_t multiplier = 0;
+		if (*value == 'k' || *value == 'K')
+			multiplier = UINT64_C(1) << 10;
+		else if (*value == 'm' || *value == 'M')
+			multiplier = UINT64_C(1) << 20;
+		else if (*value == 'g' || *value == 'G')
+			multiplier = UINT64_C(1) << 30;
+
+		++value;
+
+		// Allow also e.g. Ki, KiB, and KB.
+		if (*value != '\0' && strcmp(value, "i") != 0
+				&& strcmp(value, "iB") != 0
+				&& strcmp(value, "B") != 0)
+			multiplier = 0;
+
+		if (multiplier == 0) {
+			message(V_ERROR, _("%s: Invalid multiplier suffix"),
+					value - 1);
+			message_fatal(_("Valid suffixes are `KiB' (2^10), "
+					"`MiB' (2^20), and `GiB' (2^30)."));
+		}
+
+		// Don't overflow here either.
+		if (result > UINT64_MAX / multiplier)
+			goto error;
+
+		result *= multiplier;
+	}
+
+	if (result < min || result > max)
+		goto error;
+
+	return result;
+
+error:
+	message_fatal(_("Value of the option `%s' must be in the range "
+				"[%" PRIu64 ", %" PRIu64 "]"),
+				name, min, max);
+}
+
+
+extern uint64_t
+round_up_to_mib(uint64_t n)
+{
+	return (n >> 20) + ((n & ((UINT32_C(1) << 20) - 1)) != 0);
+}
+
+
+/// Check if thousands separator is supported. Run-time checking is easiest
+/// because it seems to be sometimes lacking even on a POSIXish system.
+/// Note that trying to use thousands separators when snprintf() doesn't
+/// support them results in undefined behavior. This just has happened to
+/// work well enough in practice.
+///
+/// DJGPP 2.05 added support for thousands separators but it's broken
+/// at least under WinXP with Finnish locale that uses a non-breaking space
+/// as the thousands separator. Workaround by disabling thousands separators
+/// for DJGPP builds.
+static void
+check_thousand_sep(uint32_t slot)
+{
+	if (thousand == UNKNOWN) {
+		bufs[slot][0] = '\0';
+#ifndef __DJGPP__
+		snprintf(bufs[slot], sizeof(bufs[slot]), "%'u", 1U);
+#endif
+		thousand = bufs[slot][0] == '1' ? WORKS : BROKEN;
+	}
+
+	return;
+}
+
+
+extern const char *
+uint64_to_str(uint64_t value, uint32_t slot)
+{
+	assert(slot < ARRAY_SIZE(bufs));
+
+	check_thousand_sep(slot);
+
+	if (thousand == WORKS)
+		snprintf(bufs[slot], sizeof(bufs[slot]), "%'" PRIu64, value);
+	else
+		snprintf(bufs[slot], sizeof(bufs[slot]), "%" PRIu64, value);
+
+	return bufs[slot];
+}
+
+
+extern const char *
+uint64_to_nicestr(uint64_t value, enum nicestr_unit unit_min,
+		enum nicestr_unit unit_max, bool always_also_bytes,
+		uint32_t slot)
+{
+	assert(unit_min <= unit_max);
+	assert(unit_max <= NICESTR_TIB);
+	assert(slot < ARRAY_SIZE(bufs));
+
+	check_thousand_sep(slot);
+
+	enum nicestr_unit unit = NICESTR_B;
+	char *pos = bufs[slot];
+	size_t left = sizeof(bufs[slot]);
+
+	if ((unit_min == NICESTR_B && value < 10000)
+			|| unit_max == NICESTR_B) {
+		// The value is shown as bytes.
+		if (thousand == WORKS)
+			my_snprintf(&pos, &left, "%'u", (unsigned int)value);
+		else
+			my_snprintf(&pos, &left, "%u", (unsigned int)value);
+	} else {
+		// Scale the value to a nicer unit. Unless unit_min and
+		// unit_max limit us, we will show at most five significant
+		// digits with one decimal place.
+		double d = (double)(value);
+		do {
+			d /= 1024.0;
+			++unit;
+		} while (unit < unit_min || (d > 9999.9 && unit < unit_max));
+
+		if (thousand == WORKS)
+			my_snprintf(&pos, &left, "%'.1f", d);
+		else
+			my_snprintf(&pos, &left, "%.1f", d);
+	}
+
+	static const char suffix[5][4] = { "B", "KiB", "MiB", "GiB", "TiB" };
+	my_snprintf(&pos, &left, " %s", suffix[unit]);
+
+	if (always_also_bytes && value >= 10000) {
+		if (thousand == WORKS)
+			snprintf(pos, left, " (%'" PRIu64 " B)", value);
+		else
+			snprintf(pos, left, " (%" PRIu64 " B)", value);
+	}
+
+	return bufs[slot];
+}
+
+
+extern void
+my_snprintf(char **pos, size_t *left, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	const int len = vsnprintf(*pos, *left, fmt, ap);
+	va_end(ap);
+
+	// If an error occurred, we want the caller to think that the whole
+	// buffer was used. This way no more data will be written to the
+	// buffer. We don't need better error handling here, although it
+	// is possible that the result looks garbage on the terminal if
+	// e.g. an UTF-8 character gets split. That shouldn't (easily)
+	// happen though, because the buffers used have some extra room.
+	if (len < 0 || (size_t)(len) >= *left) {
+		*left = 0;
+	} else {
+		*pos += len;
+		*left -= (size_t)(len);
+	}
+
+	return;
+}
+
+
+extern bool
+is_tty_stdin(void)
+{
+	const bool ret = isatty(STDIN_FILENO);
+
+	if (ret)
+		message_error(_("Compressed data cannot be read from "
+				"a terminal"));
+
+	return ret;
+}
+
+
+extern bool
+is_tty_stdout(void)
+{
+	const bool ret = isatty(STDOUT_FILENO);
+
+	if (ret)
+		message_error(_("Compressed data cannot be written to "
+				"a terminal"));
+
+	return ret;
+}
diff --git a/src/xz/util.h b/src/xz/util.h
new file mode 100644
index 0000000..4a536f5
--- /dev/null
+++ b/src/xz/util.h
@@ -0,0 +1,119 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       util.h
+/// \brief      Miscellaneous utility functions
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+/// \brief      Safe malloc() that never returns NULL
+///
+/// \note       xmalloc(), xrealloc(), and xstrdup() must not be used when
+///             there are files open for writing, that should be cleaned up
+///             before exiting.
+#define xmalloc(size) xrealloc(NULL, size)
+
+
+/// \brief      Safe realloc() that never returns NULL
+extern void *xrealloc(void *ptr, size_t size)
+		lzma_attribute((__malloc__)) lzma_attr_alloc_size(2);
+
+
+/// \brief      Safe strdup() that never returns NULL
+extern char *xstrdup(const char *src) lzma_attribute((__malloc__));
+
+
+/// \brief      Fancy version of strtoull()
+///
+/// \param      name    Name of the option to show in case of an error
+/// \param      value   String containing the number to be parsed; may
+///                     contain suffixes "k", "M", "G", "Ki", "Mi", or "Gi"
+/// \param      min     Minimum valid value
+/// \param      max     Maximum valid value
+///
+/// \return     Parsed value that is in the range [min, max]. Does not return
+///             if an error occurs.
+///
+extern uint64_t str_to_uint64(const char *name, const char *value,
+		uint64_t min, uint64_t max);
+
+
+/// \brief      Round an integer up to the next full MiB and convert to MiB
+///
+/// This is used when printing memory usage and limit.
+extern uint64_t round_up_to_mib(uint64_t n);
+
+
+/// \brief      Convert uint64_t to a string
+///
+/// Convert the given value to a string with locale-specific thousand
+/// separators, if supported by the snprintf() implementation. The string
+/// is stored into an internal static buffer indicated by the slot argument.
+/// A pointer to the selected buffer is returned.
+///
+/// This function exists, because non-POSIX systems don't support thousand
+/// separator in format strings. Solving the problem in a simple way doesn't
+/// work, because it breaks gettext (specifically, the xgettext tool).
+extern const char *uint64_to_str(uint64_t value, uint32_t slot);
+
+
+enum nicestr_unit {
+	NICESTR_B,
+	NICESTR_KIB,
+	NICESTR_MIB,
+	NICESTR_GIB,
+	NICESTR_TIB,
+};
+
+
+/// \brief      Convert uint64_t to a nice human readable string
+///
+/// This is like uint64_to_str() but uses B, KiB, MiB, GiB, or TiB suffix
+/// and optionally includes the exact size in parenthesis.
+///
+/// \param      value     Value to be printed
+/// \param      unit_min  Smallest unit to use. This and unit_max are used
+///                       e.g. when showing the progress indicator to force
+///                       the unit to MiB.
+/// \param      unit_max  Biggest unit to use. assert(unit_min <= unit_max).
+/// \param      always_also_bytes
+///                       Show also the exact byte value in parenthesis
+///                       if the nicely formatted string uses bigger unit
+///                       than bytes.
+/// \param      slot      Which static buffer to use to hold the string.
+///                       This is shared with uint64_to_str().
+///
+/// \return     Pointer to statically allocated buffer containing the string.
+///
+/// \note       This uses double_to_str() internally so the static buffer
+///             in double_to_str() will be overwritten.
+///
+extern const char *uint64_to_nicestr(uint64_t value,
+		enum nicestr_unit unit_min, enum nicestr_unit unit_max,
+		bool always_also_bytes, uint32_t slot);
+
+
+/// \brief      Wrapper for snprintf() to help constructing a string in pieces
+///
+/// A maximum of *left bytes is written starting from *pos. *pos and *left
+/// are updated accordingly.
+extern void my_snprintf(char **pos, size_t *left, const char *fmt, ...)
+		lzma_attribute((__format__(__printf__, 3, 4)));
+
+
+/// \brief      Test if stdin is a terminal
+///
+/// If stdin is a terminal, an error message is printed and exit status set
+/// to EXIT_ERROR.
+extern bool is_tty_stdin(void);
+
+
+/// \brief      Test if stdout is a terminal
+///
+/// If stdout is a terminal, an error message is printed and exit status set
+/// to EXIT_ERROR.
+extern bool is_tty_stdout(void);
diff --git a/src/xz/xz.1 b/src/xz/xz.1
new file mode 100644
index 0000000..caa5a06
--- /dev/null
+++ b/src/xz/xz.1
@@ -0,0 +1,3020 @@
+'\" t
+.\"
+.\" Author: Lasse Collin
+.\"
+.\" This file has been put into the public domain.
+.\" You can do whatever you want with this file.
+.\"
+.TH XZ 1 "2022-12-01" "Tukaani" "XZ Utils"
+.
+.SH NAME
+xz, unxz, xzcat, lzma, unlzma, lzcat \- Compress or decompress .xz and .lzma files
+.
+.SH SYNOPSIS
+.B xz
+.RI [ option... ]
+.RI [ file... ]
+.
+.SH COMMAND ALIASES
+.B unxz
+is equivalent to
+.BR "xz \-\-decompress" .
+.br
+.B xzcat
+is equivalent to
+.BR "xz \-\-decompress \-\-stdout" .
+.br
+.B lzma
+is equivalent to
+.BR "xz \-\-format=lzma" .
+.br
+.B unlzma
+is equivalent to
+.BR "xz \-\-format=lzma \-\-decompress" .
+.br
+.B lzcat
+is equivalent to
+.BR "xz \-\-format=lzma \-\-decompress \-\-stdout" .
+.PP
+When writing scripts that need to decompress files,
+it is recommended to always use the name
+.B xz
+with appropriate arguments
+.RB ( "xz \-d"
+or
+.BR "xz \-dc" )
+instead of the names
+.B unxz
+and
+.BR xzcat .
+.
+.SH DESCRIPTION
+.B xz
+is a general-purpose data compression tool with
+command line syntax similar to
+.BR gzip (1)
+and
+.BR bzip2 (1).
+The native file format is the
+.B .xz
+format, but the legacy
+.B .lzma
+format used by LZMA Utils and
+raw compressed streams with no container format headers
+are also supported.
+In addition, decompression of the
+.B .lz
+format used by
+.B lzip
+is supported.
+.PP
+.B xz
+compresses or decompresses each
+.I file
+according to the selected operation mode.
+If no
+.I files
+are given or
+.I file
+is
+.BR \- ,
+.B xz
+reads from standard input and writes the processed data
+to standard output.
+.B xz
+will refuse (display an error and skip the
+.IR file )
+to write compressed data to standard output if it is a terminal.
+Similarly,
+.B xz
+will refuse to read compressed data
+from standard input if it is a terminal.
+.PP
+Unless
+.B \-\-stdout
+is specified,
+.I files
+other than
+.B \-
+are written to a new file whose name is derived from the source
+.I file
+name:
+.IP \(bu 3
+When compressing, the suffix of the target file format
+.RB ( .xz
+or
+.BR .lzma )
+is appended to the source filename to get the target filename.
+.IP \(bu 3
+When decompressing, the
+.BR .xz ,
+.BR .lzma ,
+or
+.B .lz
+suffix is removed from the filename to get the target filename.
+.B xz
+also recognizes the suffixes
+.B .txz
+and
+.BR .tlz ,
+and replaces them with the
+.B .tar
+suffix.
+.PP
+If the target file already exists, an error is displayed and the
+.I file
+is skipped.
+.PP
+Unless writing to standard output,
+.B xz
+will display a warning and skip the
+.I file
+if any of the following applies:
+.IP \(bu 3
+.I File
+is not a regular file.
+Symbolic links are not followed,
+and thus they are not considered to be regular files.
+.IP \(bu 3
+.I File
+has more than one hard link.
+.IP \(bu 3
+.I File
+has setuid, setgid, or sticky bit set.
+.IP \(bu 3
+The operation mode is set to compress and the
+.I file
+already has a suffix of the target file format
+.RB ( .xz
+or
+.B .txz
+when compressing to the
+.B .xz
+format, and
+.B .lzma
+or
+.B .tlz
+when compressing to the
+.B .lzma
+format).
+.IP \(bu 3
+The operation mode is set to decompress and the
+.I file
+doesn't have a suffix of any of the supported file formats
+.RB ( .xz ,
+.BR .txz ,
+.BR .lzma ,
+.BR .tlz ,
+or
+.BR .lz ).
+.PP
+After successfully compressing or decompressing the
+.IR file ,
+.B xz
+copies the owner, group, permissions, access time,
+and modification time from the source
+.I file
+to the target file.
+If copying the group fails, the permissions are modified
+so that the target file doesn't become accessible to users
+who didn't have permission to access the source
+.IR file .
+.B xz
+doesn't support copying other metadata like access control lists
+or extended attributes yet.
+.PP
+Once the target file has been successfully closed, the source
+.I file
+is removed unless
+.B \-\-keep
+was specified.
+The source
+.I file
+is never removed if the output is written to standard output
+or if an error occurs.
+.PP
+Sending
+.B SIGINFO
+or
+.B SIGUSR1
+to the
+.B xz
+process makes it print progress information to standard error.
+This has only limited use since when standard error
+is a terminal, using
+.B \-\-verbose
+will display an automatically updating progress indicator.
+.
+.SS "Memory usage"
+The memory usage of
+.B xz
+varies from a few hundred kilobytes to several gigabytes
+depending on the compression settings.
+The settings used when compressing a file determine
+the memory requirements of the decompressor.
+Typically the decompressor needs 5\ % to 20\ % of
+the amount of memory that the compressor needed when
+creating the file.
+For example, decompressing a file created with
+.B xz \-9
+currently requires 65\ MiB of memory.
+Still, it is possible to have
+.B .xz
+files that require several gigabytes of memory to decompress.
+.PP
+Especially users of older systems may find
+the possibility of very large memory usage annoying.
+To prevent uncomfortable surprises,
+.B xz
+has a built-in memory usage limiter, which is disabled by default.
+While some operating systems provide ways to limit
+the memory usage of processes, relying on it
+wasn't deemed to be flexible enough (for example, using
+.BR ulimit (1)
+to limit virtual memory tends to cripple
+.BR mmap (2)).
+.PP
+The memory usage limiter can be enabled with
+the command line option \fB\-\-memlimit=\fIlimit\fR.
+Often it is more convenient to enable the limiter
+by default by setting the environment variable
+.BR XZ_DEFAULTS ,
+for example,
+.BR XZ_DEFAULTS=\-\-memlimit=150MiB .
+It is possible to set the limits separately
+for compression and decompression by using
+.BI \-\-memlimit\-compress= limit
+and \fB\-\-memlimit\-decompress=\fIlimit\fR.
+Using these two options outside
+.B XZ_DEFAULTS
+is rarely useful because a single run of
+.B xz
+cannot do both compression and decompression and
+.BI \-\-memlimit= limit
+(or
+.B \-M
+.IR limit )
+is shorter to type on the command line.
+.PP
+If the specified memory usage limit is exceeded when decompressing,
+.B xz
+will display an error and decompressing the file will fail.
+If the limit is exceeded when compressing,
+.B xz
+will try to scale the settings down so that the limit
+is no longer exceeded (except when using
+.B \-\-format=raw
+or
+.BR \-\-no\-adjust ).
+This way the operation won't fail unless the limit is very small.
+The scaling of the settings is done in steps that don't
+match the compression level presets, for example, if the limit is
+only slightly less than the amount required for
+.BR "xz \-9" ,
+the settings will be scaled down only a little,
+not all the way down to
+.BR "xz \-8" .
+.
+.SS "Concatenation and padding with .xz files"
+It is possible to concatenate
+.B .xz
+files as is.
+.B xz
+will decompress such files as if they were a single
+.B .xz
+file.
+.PP
+It is possible to insert padding between the concatenated parts
+or after the last part.
+The padding must consist of null bytes and the size
+of the padding must be a multiple of four bytes.
+This can be useful, for example, if the
+.B .xz
+file is stored on a medium that measures file sizes
+in 512-byte blocks.
+.PP
+Concatenation and padding are not allowed with
+.B .lzma
+files or raw streams.
+.
+.SH OPTIONS
+.
+.SS "Integer suffixes and special values"
+In most places where an integer argument is expected,
+an optional suffix is supported to easily indicate large integers.
+There must be no space between the integer and the suffix.
+.TP
+.B KiB
+Multiply the integer by 1,024 (2^10).
+.BR Ki ,
+.BR k ,
+.BR kB ,
+.BR K ,
+and
+.B KB
+are accepted as synonyms for
+.BR KiB .
+.TP
+.B MiB
+Multiply the integer by 1,048,576 (2^20).
+.BR Mi ,
+.BR m ,
+.BR M ,
+and
+.B MB
+are accepted as synonyms for
+.BR MiB .
+.TP
+.B GiB
+Multiply the integer by 1,073,741,824 (2^30).
+.BR Gi ,
+.BR g ,
+.BR G ,
+and
+.B GB
+are accepted as synonyms for
+.BR GiB .
+.PP
+The special value
+.B max
+can be used to indicate the maximum integer value
+supported by the option.
+.
+.SS "Operation mode"
+If multiple operation mode options are given,
+the last one takes effect.
+.TP
+.BR \-z ", " \-\-compress
+Compress.
+This is the default operation mode when no operation mode option
+is specified and no other operation mode is implied from
+the command name (for example,
+.B unxz
+implies
+.BR \-\-decompress ).
+.TP
+.BR \-d ", " \-\-decompress ", " \-\-uncompress
+Decompress.
+.TP
+.BR \-t ", " \-\-test
+Test the integrity of compressed
+.IR files .
+This option is equivalent to
+.B "\-\-decompress \-\-stdout"
+except that the decompressed data is discarded instead of being
+written to standard output.
+No files are created or removed.
+.TP
+.BR \-l ", " \-\-list
+Print information about compressed
+.IR files .
+No uncompressed output is produced,
+and no files are created or removed.
+In list mode, the program cannot read
+the compressed data from standard
+input or from other unseekable sources.
+.IP ""
+The default listing shows basic information about
+.IR files ,
+one file per line.
+To get more detailed information, use also the
+.B \-\-verbose
+option.
+For even more information, use
+.B \-\-verbose
+twice, but note that this may be slow, because getting all the extra
+information requires many seeks.
+The width of verbose output exceeds
+80 characters, so piping the output to, for example,
+.B "less\ \-S"
+may be convenient if the terminal isn't wide enough.
+.IP ""
+The exact output may vary between
+.B xz
+versions and different locales.
+For machine-readable output,
+.B \-\-robot \-\-list
+should be used.
+.
+.SS "Operation modifiers"
+.TP
+.BR \-k ", " \-\-keep
+Don't delete the input files.
+.IP ""
+Since
+.B xz
+5.2.6,
+this option also makes
+.B xz
+compress or decompress even if the input is
+a symbolic link to a regular file,
+has more than one hard link,
+or has the setuid, setgid, or sticky bit set.
+The setuid, setgid, and sticky bits are not copied
+to the target file.
+In earlier versions this was only done with
+.BR \-\-force .
+.TP
+.BR \-f ", " \-\-force
+This option has several effects:
+.RS
+.IP \(bu 3
+If the target file already exists,
+delete it before compressing or decompressing.
+.IP \(bu 3
+Compress or decompress even if the input is
+a symbolic link to a regular file,
+has more than one hard link,
+or has the setuid, setgid, or sticky bit set.
+The setuid, setgid, and sticky bits are not copied
+to the target file.
+.IP \(bu 3
+When used with
+.B \-\-decompress
+.B \-\-stdout
+and
+.B xz
+cannot recognize the type of the source file,
+copy the source file as is to standard output.
+This allows
+.B xzcat
+.B \-\-force
+to be used like
+.BR cat (1)
+for files that have not been compressed with
+.BR xz .
+Note that in future,
+.B xz
+might support new compressed file formats, which may make
+.B xz
+decompress more types of files instead of copying them as is to
+standard output.
+.BI \-\-format= format
+can be used to restrict
+.B xz
+to decompress only a single file format.
+.RE
+.TP
+.BR \-c ", " \-\-stdout ", " \-\-to\-stdout
+Write the compressed or decompressed data to
+standard output instead of a file.
+This implies
+.BR \-\-keep .
+.TP
+.B \-\-single\-stream
+Decompress only the first
+.B .xz
+stream, and
+silently ignore possible remaining input data following the stream.
+Normally such trailing garbage makes
+.B xz
+display an error.
+.IP ""
+.B xz
+never decompresses more than one stream from
+.B .lzma
+files or raw streams, but this option still makes
+.B xz
+ignore the possible trailing data after the
+.B .lzma
+file or raw stream.
+.IP ""
+This option has no effect if the operation mode is not
+.B \-\-decompress
+or
+.BR \-\-test .
+.TP
+.B \-\-no\-sparse
+Disable creation of sparse files.
+By default, if decompressing into a regular file,
+.B xz
+tries to make the file sparse if the decompressed data contains
+long sequences of binary zeros.
+It also works when writing to standard output
+as long as standard output is connected to a regular file
+and certain additional conditions are met to make it safe.
+Creating sparse files may save disk space and speed up
+the decompression by reducing the amount of disk I/O.
+.TP
+\fB\-S\fR \fI.suf\fR, \fB\-\-suffix=\fI.suf
+When compressing, use
+.I .suf
+as the suffix for the target file instead of
+.B .xz
+or
+.BR .lzma .
+If not writing to standard output and
+the source file already has the suffix
+.IR .suf ,
+a warning is displayed and the file is skipped.
+.IP ""
+When decompressing, recognize files with the suffix
+.I .suf
+in addition to files with the
+.BR .xz ,
+.BR .txz ,
+.BR .lzma ,
+.BR .tlz ,
+or
+.B .lz
+suffix.
+If the source file has the suffix
+.IR .suf ,
+the suffix is removed to get the target filename.
+.IP ""
+When compressing or decompressing raw streams
+.RB ( \-\-format=raw ),
+the suffix must always be specified unless
+writing to standard output,
+because there is no default suffix for raw streams.
+.TP
+\fB\-\-files\fR[\fB=\fIfile\fR]
+Read the filenames to process from
+.IR file ;
+if
+.I file
+is omitted, filenames are read from standard input.
+Filenames must be terminated with the newline character.
+A dash
+.RB ( \- )
+is taken as a regular filename; it doesn't mean standard input.
+If filenames are given also as command line arguments, they are
+processed before the filenames read from
+.IR file .
+.TP
+\fB\-\-files0\fR[\fB=\fIfile\fR]
+This is identical to \fB\-\-files\fR[\fB=\fIfile\fR] except
+that each filename must be terminated with the null character.
+.
+.SS "Basic file format and compression options"
+.TP
+\fB\-F\fR \fIformat\fR, \fB\-\-format=\fIformat
+Specify the file
+.I format
+to compress or decompress:
+.RS
+.TP
+.B auto
+This is the default.
+When compressing,
+.B auto
+is equivalent to
+.BR xz .
+When decompressing,
+the format of the input file is automatically detected.
+Note that raw streams (created with
+.BR \-\-format=raw )
+cannot be auto-detected.
+.TP
+.B xz
+Compress to the
+.B .xz
+file format, or accept only
+.B .xz
+files when decompressing.
+.TP
+.BR lzma ", " alone
+Compress to the legacy
+.B .lzma
+file format, or accept only
+.B .lzma
+files when decompressing.
+The alternative name
+.B alone
+is provided for backwards compatibility with LZMA Utils.
+.TP
+.B lzip
+Accept only
+.B .lz
+files when decompressing.
+Compression is not supported.
+.IP ""
+The
+.B .lz
+format version 0 and the unextended version 1 are supported.
+Version 0 files were produced by
+.B lzip
+1.3 and older.
+Such files aren't common but may be found from file archives
+as a few source packages were released in this format.
+People might have old personal files in this format too.
+Decompression support for the format version 0 was removed in
+.B lzip
+1.18.
+.IP ""
+.B lzip
+1.4 and later create files in the format version 1.
+The sync flush marker extension to the format version 1 was added in
+.B lzip
+1.6.
+This extension is rarely used and isn't supported by
+.B xz
+(diagnosed as corrupt input).
+.TP
+.B raw
+Compress or uncompress a raw stream (no headers).
+This is meant for advanced users only.
+To decode raw streams, you need use
+.B \-\-format=raw
+and explicitly specify the filter chain,
+which normally would have been stored in the container headers.
+.RE
+.TP
+\fB\-C\fR \fIcheck\fR, \fB\-\-check=\fIcheck
+Specify the type of the integrity check.
+The check is calculated from the uncompressed data and
+stored in the
+.B .xz
+file.
+This option has an effect only when compressing into the
+.B .xz
+format; the
+.B .lzma
+format doesn't support integrity checks.
+The integrity check (if any) is verified when the
+.B .xz
+file is decompressed.
+.IP ""
+Supported
+.I check
+types:
+.RS
+.TP
+.B none
+Don't calculate an integrity check at all.
+This is usually a bad idea.
+This can be useful when integrity of the data is verified
+by other means anyway.
+.TP
+.B crc32
+Calculate CRC32 using the polynomial from IEEE-802.3 (Ethernet).
+.TP
+.B crc64
+Calculate CRC64 using the polynomial from ECMA-182.
+This is the default, since it is slightly better than CRC32
+at detecting damaged files and the speed difference is negligible.
+.TP
+.B sha256
+Calculate SHA-256.
+This is somewhat slower than CRC32 and CRC64.
+.RE
+.IP ""
+Integrity of the
+.B .xz
+headers is always verified with CRC32.
+It is not possible to change or disable it.
+.TP
+.B \-\-ignore\-check
+Don't verify the integrity check of the compressed data when decompressing.
+The CRC32 values in the
+.B .xz
+headers will still be verified normally.
+.IP ""
+.B "Do not use this option unless you know what you are doing."
+Possible reasons to use this option:
+.RS
+.IP \(bu 3
+Trying to recover data from a corrupt .xz file.
+.IP \(bu 3
+Speeding up decompression.
+This matters mostly with SHA-256 or
+with files that have compressed extremely well.
+It's recommended to not use this option for this purpose
+unless the file integrity is verified externally in some other way.
+.RE
+.TP
+.BR \-0 " ... " \-9
+Select a compression preset level.
+The default is
+.BR \-6 .
+If multiple preset levels are specified,
+the last one takes effect.
+If a custom filter chain was already specified, setting
+a compression preset level clears the custom filter chain.
+.IP ""
+The differences between the presets are more significant than with
+.BR gzip (1)
+and
+.BR bzip2 (1).
+The selected compression settings determine
+the memory requirements of the decompressor,
+thus using a too high preset level might make it painful
+to decompress the file on an old system with little RAM.
+Specifically,
+.B "it's not a good idea to blindly use \-9 for everything"
+like it often is with
+.BR gzip (1)
+and
+.BR bzip2 (1).
+.RS
+.TP
+.BR "\-0" " ... " "\-3"
+These are somewhat fast presets.
+.B \-0
+is sometimes faster than
+.B "gzip \-9"
+while compressing much better.
+The higher ones often have speed comparable to
+.BR bzip2 (1)
+with comparable or better compression ratio,
+although the results
+depend a lot on the type of data being compressed.
+.TP
+.BR "\-4" " ... " "\-6"
+Good to very good compression while keeping
+decompressor memory usage reasonable even for old systems.
+.B \-6
+is the default, which is usually a good choice
+for distributing files that need to be decompressible
+even on systems with only 16\ MiB RAM.
+.RB ( \-5e
+or
+.B \-6e
+may be worth considering too.
+See
+.BR \-\-extreme .)
+.TP
+.B "\-7 ... \-9"
+These are like
+.B \-6
+but with higher compressor and decompressor memory requirements.
+These are useful only when compressing files bigger than
+8\ MiB, 16\ MiB, and 32\ MiB, respectively.
+.RE
+.IP ""
+On the same hardware, the decompression speed is approximately
+a constant number of bytes of compressed data per second.
+In other words, the better the compression,
+the faster the decompression will usually be.
+This also means that the amount of uncompressed output
+produced per second can vary a lot.
+.IP ""
+The following table summarises the features of the presets:
+.RS
+.RS
+.PP
+.TS
+tab(;);
+c c c c c
+n n n n n.
+Preset;DictSize;CompCPU;CompMem;DecMem
+\-0;256 KiB;0;3 MiB;1 MiB
+\-1;1 MiB;1;9 MiB;2 MiB
+\-2;2 MiB;2;17 MiB;3 MiB
+\-3;4 MiB;3;32 MiB;5 MiB
+\-4;4 MiB;4;48 MiB;5 MiB
+\-5;8 MiB;5;94 MiB;9 MiB
+\-6;8 MiB;6;94 MiB;9 MiB
+\-7;16 MiB;6;186 MiB;17 MiB
+\-8;32 MiB;6;370 MiB;33 MiB
+\-9;64 MiB;6;674 MiB;65 MiB
+.TE
+.RE
+.RE
+.IP ""
+Column descriptions:
+.RS
+.IP \(bu 3
+DictSize is the LZMA2 dictionary size.
+It is waste of memory to use a dictionary bigger than
+the size of the uncompressed file.
+This is why it is good to avoid using the presets
+.BR \-7 " ... " \-9
+when there's no real need for them.
+At
+.B \-6
+and lower, the amount of memory wasted is
+usually low enough to not matter.
+.IP \(bu 3
+CompCPU is a simplified representation of the LZMA2 settings
+that affect compression speed.
+The dictionary size affects speed too,
+so while CompCPU is the same for levels
+.BR \-6 " ... " \-9 ,
+higher levels still tend to be a little slower.
+To get even slower and thus possibly better compression, see
+.BR \-\-extreme .
+.IP \(bu 3
+CompMem contains the compressor memory requirements
+in the single-threaded mode.
+It may vary slightly between
+.B xz
+versions.
+Memory requirements of some of the future multithreaded modes may
+be dramatically higher than that of the single-threaded mode.
+.IP \(bu 3
+DecMem contains the decompressor memory requirements.
+That is, the compression settings determine
+the memory requirements of the decompressor.
+The exact decompressor memory usage is slightly more than
+the LZMA2 dictionary size, but the values in the table
+have been rounded up to the next full MiB.
+.RE
+.TP
+.BR \-e ", " \-\-extreme
+Use a slower variant of the selected compression preset level
+.RB ( \-0 " ... " \-9 )
+to hopefully get a little bit better compression ratio,
+but with bad luck this can also make it worse.
+Decompressor memory usage is not affected,
+but compressor memory usage increases a little at preset levels
+.BR \-0 " ... " \-3 .
+.IP ""
+Since there are two presets with dictionary sizes
+4\ MiB and 8\ MiB, the presets
+.B \-3e
+and
+.B \-5e
+use slightly faster settings (lower CompCPU) than
+.B \-4e
+and
+.BR \-6e ,
+respectively.
+That way no two presets are identical.
+.RS
+.RS
+.PP
+.TS
+tab(;);
+c c c c c
+n n n n n.
+Preset;DictSize;CompCPU;CompMem;DecMem
+\-0e;256 KiB;8;4 MiB;1 MiB
+\-1e;1 MiB;8;13 MiB;2 MiB
+\-2e;2 MiB;8;25 MiB;3 MiB
+\-3e;4 MiB;7;48 MiB;5 MiB
+\-4e;4 MiB;8;48 MiB;5 MiB
+\-5e;8 MiB;7;94 MiB;9 MiB
+\-6e;8 MiB;8;94 MiB;9 MiB
+\-7e;16 MiB;8;186 MiB;17 MiB
+\-8e;32 MiB;8;370 MiB;33 MiB
+\-9e;64 MiB;8;674 MiB;65 MiB
+.TE
+.RE
+.RE
+.IP ""
+For example, there are a total of four presets that use
+8\ MiB dictionary, whose order from the fastest to the slowest is
+.BR \-5 ,
+.BR \-6 ,
+.BR \-5e ,
+and
+.BR \-6e .
+.TP
+.B \-\-fast
+.PD 0
+.TP
+.B \-\-best
+.PD
+These are somewhat misleading aliases for
+.B \-0
+and
+.BR \-9 ,
+respectively.
+These are provided only for backwards compatibility
+with LZMA Utils.
+Avoid using these options.
+.TP
+.BI \-\-block\-size= size
+When compressing to the
+.B .xz
+format, split the input data into blocks of
+.I size
+bytes.
+The blocks are compressed independently from each other,
+which helps with multi-threading and
+makes limited random-access decompression possible.
+This option is typically used to override the default
+block size in multi-threaded mode,
+but this option can be used in single-threaded mode too.
+.IP ""
+In multi-threaded mode about three times
+.I size
+bytes will be allocated in each thread for buffering input and output.
+The default
+.I size
+is three times the LZMA2 dictionary size or 1 MiB,
+whichever is more.
+Typically a good value is 2\(en4 times
+the size of the LZMA2 dictionary or at least 1 MiB.
+Using
+.I size
+less than the LZMA2 dictionary size is waste of RAM
+because then the LZMA2 dictionary buffer will never get fully used.
+The sizes of the blocks are stored in the block headers,
+which a future version of
+.B xz
+will use for multi-threaded decompression.
+.IP ""
+In single-threaded mode no block splitting is done by default.
+Setting this option doesn't affect memory usage.
+No size information is stored in block headers,
+thus files created in single-threaded mode
+won't be identical to files created in multi-threaded mode.
+The lack of size information also means that a future version of
+.B xz
+won't be able decompress the files in multi-threaded mode.
+.TP
+.BI \-\-block\-list= sizes
+When compressing to the
+.B .xz
+format, start a new block after
+the given intervals of uncompressed data.
+.IP ""
+The uncompressed
+.I sizes
+of the blocks are specified as a comma-separated list.
+Omitting a size (two or more consecutive commas) is a shorthand
+to use the size of the previous block.
+.IP ""
+If the input file is bigger than the sum of
+.IR sizes ,
+the last value in
+.I sizes
+is repeated until the end of the file.
+A special value of
+.B 0
+may be used as the last value to indicate that
+the rest of the file should be encoded as a single block.
+.IP ""
+If one specifies
+.I sizes
+that exceed the encoder's block size
+(either the default value in threaded mode or
+the value specified with \fB\-\-block\-size=\fIsize\fR),
+the encoder will create additional blocks while
+keeping the boundaries specified in
+.IR sizes .
+For example, if one specifies
+.B \-\-block\-size=10MiB
+.B \-\-block\-list=5MiB,10MiB,8MiB,12MiB,24MiB
+and the input file is 80 MiB,
+one will get 11 blocks:
+5, 10, 8, 10, 2, 10, 10, 4, 10, 10, and 1 MiB.
+.IP ""
+In multi-threaded mode the sizes of the blocks
+are stored in the block headers.
+This isn't done in single-threaded mode,
+so the encoded output won't be
+identical to that of the multi-threaded mode.
+.TP
+.BI \-\-flush\-timeout= timeout
+When compressing, if more than
+.I timeout
+milliseconds (a positive integer) has passed since the previous flush and
+reading more input would block,
+all the pending input data is flushed from the encoder and
+made available in the output stream.
+This can be useful if
+.B xz
+is used to compress data that is streamed over a network.
+Small
+.I timeout
+values make the data available at the receiving end
+with a small delay, but large
+.I timeout
+values give better compression ratio.
+.IP ""
+This feature is disabled by default.
+If this option is specified more than once, the last one takes effect.
+The special
+.I timeout
+value of
+.B 0
+can be used to explicitly disable this feature.
+.IP ""
+This feature is not available on non-POSIX systems.
+.IP ""
+.\" FIXME
+.B "This feature is still experimental."
+Currently
+.B xz
+is unsuitable for decompressing the stream in real time due to how
+.B xz
+does buffering.
+.TP
+.BI \-\-memlimit\-compress= limit
+Set a memory usage limit for compression.
+If this option is specified multiple times,
+the last one takes effect.
+.IP ""
+If the compression settings exceed the
+.IR limit ,
+.B xz
+will attempt to adjust the settings downwards so that
+the limit is no longer exceeded and display a notice that
+automatic adjustment was done.
+The adjustments are done in this order:
+reducing the number of threads,
+switching to single-threaded mode
+if even one thread in multi-threaded mode exceeds the
+.IR limit ,
+and finally reducing the LZMA2 dictionary size.
+.IP ""
+When compressing with
+.B \-\-format=raw
+or if
+.B \-\-no\-adjust
+has been specified,
+only the number of threads may be reduced
+since it can be done without affecting the compressed output.
+.IP ""
+If the
+.I limit
+cannot be met even with the adjustments described above,
+an error is displayed and
+.B xz
+will exit with exit status 1.
+.IP ""
+The
+.I limit
+can be specified in multiple ways:
+.RS
+.IP \(bu 3
+The
+.I limit
+can be an absolute value in bytes.
+Using an integer suffix like
+.B MiB
+can be useful.
+Example:
+.B "\-\-memlimit\-compress=80MiB"
+.IP \(bu 3
+The
+.I limit
+can be specified as a percentage of total physical memory (RAM).
+This can be useful especially when setting the
+.B XZ_DEFAULTS
+environment variable in a shell initialization script
+that is shared between different computers.
+That way the limit is automatically bigger
+on systems with more memory.
+Example:
+.B "\-\-memlimit\-compress=70%"
+.IP \(bu 3
+The
+.I limit
+can be reset back to its default value by setting it to
+.BR 0 .
+This is currently equivalent to setting the
+.I limit
+to
+.B max
+(no memory usage limit).
+.RE
+.IP ""
+For 32-bit
+.B xz
+there is a special case: if the
+.I limit
+would be over
+.BR "4020\ MiB" ,
+the
+.I limit
+is set to
+.BR "4020\ MiB" .
+On MIPS32
+.B "2000\ MiB"
+is used instead.
+(The values
+.B 0
+and
+.B max
+aren't affected by this.
+A similar feature doesn't exist for decompression.)
+This can be helpful when a 32-bit executable has access
+to 4\ GiB address space (2 GiB on MIPS32)
+while hopefully doing no harm in other situations.
+.IP ""
+See also the section
+.BR "Memory usage" .
+.TP
+.BI \-\-memlimit\-decompress= limit
+Set a memory usage limit for decompression.
+This also affects the
+.B \-\-list
+mode.
+If the operation is not possible without exceeding the
+.IR limit ,
+.B xz
+will display an error and decompressing the file will fail.
+See
+.BI \-\-memlimit\-compress= limit
+for possible ways to specify the
+.IR limit .
+.TP
+.BI \-\-memlimit\-mt\-decompress= limit
+Set a memory usage limit for multi-threaded decompression.
+This can only affect the number of threads;
+this will never make
+.B xz
+refuse to decompress a file.
+If
+.I limit
+is too low to allow any multi-threading, the
+.I limit
+is ignored and
+.B xz
+will continue in single-threaded mode.
+Note that if also
+.B \-\-memlimit\-decompress
+is used,
+it will always apply to both single-threaded and multi-threaded modes,
+and so the effective
+.I limit
+for multi-threading will never be higher than the limit set with
+.BR \-\-memlimit\-decompress .
+.IP ""
+In contrast to the other memory usage limit options,
+.BI \-\-memlimit\-mt\-decompress= limit
+has a system-specific default
+.IR limit .
+.B "xz \-\-info\-memory"
+can be used to see the current value.
+.IP ""
+This option and its default value exist
+because without any limit the threaded decompressor
+could end up allocating an insane amount of memory with some input files.
+If the default
+.I limit
+is too low on your system,
+feel free to increase the
+.I limit
+but never set it to a value larger than the amount of usable RAM
+as with appropriate input files
+.B xz
+will attempt to use that amount of memory
+even with a low number of threads.
+Running out of memory or swapping
+will not improve decompression performance.
+.IP ""
+See
+.BI \-\-memlimit\-compress= limit
+for possible ways to specify the
+.IR limit .
+Setting
+.I limit
+to
+.B 0
+resets the
+.I limit
+to the default system-specific value.
+.IP ""
+.TP
+\fB\-M\fR \fIlimit\fR, \fB\-\-memlimit=\fIlimit\fR, \fB\-\-memory=\fIlimit
+This is equivalent to specifying
+.BI \-\-memlimit\-compress= limit
+.BI \-\-memlimit-decompress= limit
+\fB\-\-memlimit\-mt\-decompress=\fIlimit\fR.
+.TP
+.B \-\-no\-adjust
+Display an error and exit if the memory usage limit cannot be
+met without adjusting settings that affect the compressed output.
+That is, this prevents
+.B xz
+from switching the encoder from multi-threaded mode to single-threaded mode
+and from reducing the LZMA2 dictionary size.
+Even when this option is used the number of threads may be reduced
+to meet the memory usage limit as that won't affect the compressed output.
+.IP ""
+Automatic adjusting is always disabled when creating raw streams
+.RB ( \-\-format=raw ).
+.TP
+\fB\-T\fR \fIthreads\fR, \fB\-\-threads=\fIthreads
+Specify the number of worker threads to use.
+Setting
+.I threads
+to a special value
+.B 0
+makes
+.B xz
+use up to as many threads as the processor(s) on the system support.
+The actual number of threads can be fewer than
+.I threads
+if the input file is not big enough
+for threading with the given settings or
+if using more threads would exceed the memory usage limit.
+.IP ""
+The single-threaded and multi-threaded compressors produce different output.
+Single-threaded compressor will give the smallest file size but
+only the output from the multi-threaded compressor can be decompressed
+using multiple threads.
+Setting
+.I threads
+to
+.B 1
+will use the single-threaded mode.
+Setting
+.I threads
+to any other value, including
+.BR 0 ,
+will use the multi-threaded compressor
+even if the system supports only one hardware thread.
+.RB ( xz
+5.2.x
+used single-threaded mode in this situation.)
+.IP ""
+To use multi-threaded mode with only one thread, set
+.I threads
+to
+.BR +1 .
+The
+.B +
+prefix has no effect with values other than
+.BR 1 .
+A memory usage limit can still make
+.B xz
+switch to single-threaded mode unless
+.B \-\-no\-adjust
+is used.
+Support for the
+.B +
+prefix was added in
+.B xz
+5.4.0.
+.IP ""
+If an automatic number of threads has been requested and
+no memory usage limit has been specified,
+then a system-specific default soft limit will be used to possibly
+limit the number of threads.
+It is a soft limit in sense that it is ignored
+if the number of threads becomes one,
+thus a soft limit will never stop
+.B xz
+from compressing or decompressing.
+This default soft limit will not make
+.B xz
+switch from multi-threaded mode to single-threaded mode.
+The active limits can be seen with
+.BR "xz \-\-info\-memory" .
+.IP ""
+Currently the only threading method is to split the input into
+blocks and compress them independently from each other.
+The default block size depends on the compression level and
+can be overridden with the
+.BI \-\-block\-size= size
+option.
+.IP ""
+Threaded decompression only works on files that contain
+multiple blocks with size information in block headers.
+All large enough files compressed in multi-threaded mode
+meet this condition,
+but files compressed in single-threaded mode don't even if
+.BI \-\-block\-size= size
+has been used.
+.
+.SS "Custom compressor filter chains"
+A custom filter chain allows specifying
+the compression settings in detail instead of relying on
+the settings associated to the presets.
+When a custom filter chain is specified,
+preset options
+.RB ( \-0
+\&...\&
+.B \-9
+and
+.BR \-\-extreme )
+earlier on the command line are forgotten.
+If a preset option is specified
+after one or more custom filter chain options,
+the new preset takes effect and
+the custom filter chain options specified earlier are forgotten.
+.PP
+A filter chain is comparable to piping on the command line.
+When compressing, the uncompressed input goes to the first filter,
+whose output goes to the next filter (if any).
+The output of the last filter gets written to the compressed file.
+The maximum number of filters in the chain is four,
+but typically a filter chain has only one or two filters.
+.PP
+Many filters have limitations on where they can be
+in the filter chain:
+some filters can work only as the last filter in the chain,
+some only as a non-last filter, and some work in any position
+in the chain.
+Depending on the filter, this limitation is either inherent to
+the filter design or exists to prevent security issues.
+.PP
+A custom filter chain is specified by using one or more
+filter options in the order they are wanted in the filter chain.
+That is, the order of filter options is significant!
+When decoding raw streams
+.RB ( \-\-format=raw ),
+the filter chain is specified in the same order as
+it was specified when compressing.
+.PP
+Filters take filter-specific
+.I options
+as a comma-separated list.
+Extra commas in
+.I options
+are ignored.
+Every option has a default value, so you need to
+specify only those you want to change.
+.PP
+To see the whole filter chain and
+.IR options ,
+use
+.B "xz \-vv"
+(that is, use
+.B \-\-verbose
+twice).
+This works also for viewing the filter chain options used by presets.
+.TP
+\fB\-\-lzma1\fR[\fB=\fIoptions\fR]
+.PD 0
+.TP
+\fB\-\-lzma2\fR[\fB=\fIoptions\fR]
+.PD
+Add LZMA1 or LZMA2 filter to the filter chain.
+These filters can be used only as the last filter in the chain.
+.IP ""
+LZMA1 is a legacy filter,
+which is supported almost solely due to the legacy
+.B .lzma
+file format, which supports only LZMA1.
+LZMA2 is an updated
+version of LZMA1 to fix some practical issues of LZMA1.
+The
+.B .xz
+format uses LZMA2 and doesn't support LZMA1 at all.
+Compression speed and ratios of LZMA1 and LZMA2
+are practically the same.
+.IP ""
+LZMA1 and LZMA2 share the same set of
+.IR options :
+.RS
+.TP
+.BI preset= preset
+Reset all LZMA1 or LZMA2
+.I options
+to
+.IR preset .
+.I Preset
+consist of an integer, which may be followed by single-letter
+preset modifiers.
+The integer can be from
+.B 0
+to
+.BR 9 ,
+matching the command line options
+.B \-0
+\&...\&
+.BR \-9 .
+The only supported modifier is currently
+.BR e ,
+which matches
+.BR \-\-extreme .
+If no
+.B preset
+is specified, the default values of LZMA1 or LZMA2
+.I options
+are taken from the preset
+.BR 6 .
+.TP
+.BI dict= size
+Dictionary (history buffer)
+.I size
+indicates how many bytes of the recently processed
+uncompressed data is kept in memory.
+The algorithm tries to find repeating byte sequences (matches) in
+the uncompressed data, and replace them with references
+to the data currently in the dictionary.
+The bigger the dictionary, the higher is the chance
+to find a match.
+Thus, increasing dictionary
+.I size
+usually improves compression ratio, but
+a dictionary bigger than the uncompressed file is waste of memory.
+.IP ""
+Typical dictionary
+.I size
+is from 64\ KiB to 64\ MiB.
+The minimum is 4\ KiB.
+The maximum for compression is currently 1.5\ GiB (1536\ MiB).
+The decompressor already supports dictionaries up to
+one byte less than 4\ GiB, which is the maximum for
+the LZMA1 and LZMA2 stream formats.
+.IP ""
+Dictionary
+.I size
+and match finder
+.RI ( mf )
+together determine the memory usage of the LZMA1 or LZMA2 encoder.
+The same (or bigger) dictionary
+.I size
+is required for decompressing that was used when compressing,
+thus the memory usage of the decoder is determined
+by the dictionary size used when compressing.
+The
+.B .xz
+headers store the dictionary
+.I size
+either as
+.RI "2^" n
+or
+.RI "2^" n " + 2^(" n "\-1),"
+so these
+.I sizes
+are somewhat preferred for compression.
+Other
+.I sizes
+will get rounded up when stored in the
+.B .xz
+headers.
+.TP
+.BI lc= lc
+Specify the number of literal context bits.
+The minimum is 0 and the maximum is 4; the default is 3.
+In addition, the sum of
+.I lc
+and
+.I lp
+must not exceed 4.
+.IP ""
+All bytes that cannot be encoded as matches
+are encoded as literals.
+That is, literals are simply 8-bit bytes
+that are encoded one at a time.
+.IP ""
+The literal coding makes an assumption that the highest
+.I lc
+bits of the previous uncompressed byte correlate
+with the next byte.
+For example, in typical English text, an upper-case letter is
+often followed by a lower-case letter, and a lower-case
+letter is usually followed by another lower-case letter.
+In the US-ASCII character set, the highest three bits are 010
+for upper-case letters and 011 for lower-case letters.
+When
+.I lc
+is at least 3, the literal coding can take advantage of
+this property in the uncompressed data.
+.IP ""
+The default value (3) is usually good.
+If you want maximum compression, test
+.BR lc=4 .
+Sometimes it helps a little, and
+sometimes it makes compression worse.
+If it makes it worse, test
+.B lc=2
+too.
+.TP
+.BI lp= lp
+Specify the number of literal position bits.
+The minimum is 0 and the maximum is 4; the default is 0.
+.IP ""
+.I Lp
+affects what kind of alignment in the uncompressed data is
+assumed when encoding literals.
+See
+.I pb
+below for more information about alignment.
+.TP
+.BI pb= pb
+Specify the number of position bits.
+The minimum is 0 and the maximum is 4; the default is 2.
+.IP ""
+.I Pb
+affects what kind of alignment in the uncompressed data is
+assumed in general.
+The default means four-byte alignment
+.RI (2^ pb =2^2=4),
+which is often a good choice when there's no better guess.
+.IP ""
+When the alignment is known, setting
+.I pb
+accordingly may reduce the file size a little.
+For example, with text files having one-byte
+alignment (US-ASCII, ISO-8859-*, UTF-8), setting
+.B pb=0
+can improve compression slightly.
+For UTF-16 text,
+.B pb=1
+is a good choice.
+If the alignment is an odd number like 3 bytes,
+.B pb=0
+might be the best choice.
+.IP ""
+Even though the assumed alignment can be adjusted with
+.I pb
+and
+.IR lp ,
+LZMA1 and LZMA2 still slightly favor 16-byte alignment.
+It might be worth taking into account when designing file formats
+that are likely to be often compressed with LZMA1 or LZMA2.
+.TP
+.BI mf= mf
+Match finder has a major effect on encoder speed,
+memory usage, and compression ratio.
+Usually Hash Chain match finders are faster than Binary Tree
+match finders.
+The default depends on the
+.IR preset :
+0 uses
+.BR hc3 ,
+1\(en3
+use
+.BR hc4 ,
+and the rest use
+.BR bt4 .
+.IP ""
+The following match finders are supported.
+The memory usage formulas below are rough approximations,
+which are closest to the reality when
+.I dict
+is a power of two.
+.RS
+.TP
+.B hc3
+Hash Chain with 2- and 3-byte hashing
+.br
+Minimum value for
+.IR nice :
+3
+.br
+Memory usage:
+.br
+.I dict
+* 7.5 (if
+.I dict
+<= 16 MiB);
+.br
+.I dict
+* 5.5 + 64 MiB (if
+.I dict
+> 16 MiB)
+.TP
+.B hc4
+Hash Chain with 2-, 3-, and 4-byte hashing
+.br
+Minimum value for
+.IR nice :
+4
+.br
+Memory usage:
+.br
+.I dict
+* 7.5 (if
+.I dict
+<= 32 MiB);
+.br
+.I dict
+* 6.5 (if
+.I dict
+> 32 MiB)
+.TP
+.B bt2
+Binary Tree with 2-byte hashing
+.br
+Minimum value for
+.IR nice :
+2
+.br
+Memory usage:
+.I dict
+* 9.5
+.TP
+.B bt3
+Binary Tree with 2- and 3-byte hashing
+.br
+Minimum value for
+.IR nice :
+3
+.br
+Memory usage:
+.br
+.I dict
+* 11.5 (if
+.I dict
+<= 16 MiB);
+.br
+.I dict
+* 9.5 + 64 MiB (if
+.I dict
+> 16 MiB)
+.TP
+.B bt4
+Binary Tree with 2-, 3-, and 4-byte hashing
+.br
+Minimum value for
+.IR nice :
+4
+.br
+Memory usage:
+.br
+.I dict
+* 11.5 (if
+.I dict
+<= 32 MiB);
+.br
+.I dict
+* 10.5 (if
+.I dict
+> 32 MiB)
+.RE
+.TP
+.BI mode= mode
+Compression
+.I mode
+specifies the method to analyze
+the data produced by the match finder.
+Supported
+.I modes
+are
+.B fast
+and
+.BR normal .
+The default is
+.B fast
+for
+.I presets
+0\(en3 and
+.B normal
+for
+.I presets
+4\(en9.
+.IP ""
+Usually
+.B fast
+is used with Hash Chain match finders and
+.B normal
+with Binary Tree match finders.
+This is also what the
+.I presets
+do.
+.TP
+.BI nice= nice
+Specify what is considered to be a nice length for a match.
+Once a match of at least
+.I nice
+bytes is found, the algorithm stops
+looking for possibly better matches.
+.IP ""
+.I Nice
+can be 2\(en273 bytes.
+Higher values tend to give better compression ratio
+at the expense of speed.
+The default depends on the
+.IR preset .
+.TP
+.BI depth= depth
+Specify the maximum search depth in the match finder.
+The default is the special value of 0,
+which makes the compressor determine a reasonable
+.I depth
+from
+.I mf
+and
+.IR nice .
+.IP ""
+Reasonable
+.I depth
+for Hash Chains is 4\(en100 and 16\(en1000 for Binary Trees.
+Using very high values for
+.I depth
+can make the encoder extremely slow with some files.
+Avoid setting the
+.I depth
+over 1000 unless you are prepared to interrupt
+the compression in case it is taking far too long.
+.RE
+.IP ""
+When decoding raw streams
+.RB ( \-\-format=raw ),
+LZMA2 needs only the dictionary
+.IR size .
+LZMA1 needs also
+.IR lc ,
+.IR lp ,
+and
+.IR pb .
+.TP
+\fB\-\-x86\fR[\fB=\fIoptions\fR]
+.PD 0
+.TP
+\fB\-\-arm\fR[\fB=\fIoptions\fR]
+.TP
+\fB\-\-armthumb\fR[\fB=\fIoptions\fR]
+.TP
+\fB\-\-arm64\fR[\fB=\fIoptions\fR]
+.TP
+\fB\-\-powerpc\fR[\fB=\fIoptions\fR]
+.TP
+\fB\-\-ia64\fR[\fB=\fIoptions\fR]
+.TP
+\fB\-\-sparc\fR[\fB=\fIoptions\fR]
+.PD
+Add a branch/call/jump (BCJ) filter to the filter chain.
+These filters can be used only as a non-last filter
+in the filter chain.
+.IP ""
+A BCJ filter converts relative addresses in
+the machine code to their absolute counterparts.
+This doesn't change the size of the data
+but it increases redundancy,
+which can help LZMA2 to produce 0\(en15\ % smaller
+.B .xz
+file.
+The BCJ filters are always reversible,
+so using a BCJ filter for wrong type of data
+doesn't cause any data loss, although it may make
+the compression ratio slightly worse.
+The BCJ filters are very fast and
+use an insignificant amount of memory.
+.IP ""
+These BCJ filters have known problems related to
+the compression ratio:
+.RS
+.IP \(bu 3
+Some types of files containing executable code
+(for example, object files, static libraries, and Linux kernel modules)
+have the addresses in the instructions filled with filler values.
+These BCJ filters will still do the address conversion,
+which will make the compression worse with these files.
+.IP \(bu 3
+If a BCJ filter is applied on an archive,
+it is possible that it makes the compression ratio
+worse than not using a BCJ filter.
+For example, if there are similar or even identical executables
+then filtering will likely make the files less similar
+and thus compression is worse.
+The contents of non-executable files in the same archive can matter too.
+In practice one has to try with and without a BCJ filter to see
+which is better in each situation.
+.RE
+.IP ""
+Different instruction sets have different alignment:
+the executable file must be aligned to a multiple of
+this value in the input data to make the filter work.
+.RS
+.RS
+.PP
+.TS
+tab(;);
+l n l
+l n l.
+Filter;Alignment;Notes
+x86;1;32-bit or 64-bit x86
+ARM;4;
+ARM-Thumb;2;
+ARM64;4;4096-byte alignment is best
+PowerPC;4;Big endian only
+IA-64;16;Itanium
+SPARC;4;
+.TE
+.RE
+.RE
+.IP ""
+Since the BCJ-filtered data is usually compressed with LZMA2,
+the compression ratio may be improved slightly if
+the LZMA2 options are set to match the
+alignment of the selected BCJ filter.
+For example, with the IA-64 filter, it's good to set
+.B pb=4
+or even
+.B pb=4,lp=4,lc=0
+with LZMA2 (2^4=16).
+The x86 filter is an exception;
+it's usually good to stick to LZMA2's default
+four-byte alignment when compressing x86 executables.
+.IP ""
+All BCJ filters support the same
+.IR options :
+.RS
+.TP
+.BI start= offset
+Specify the start
+.I offset
+that is used when converting between relative
+and absolute addresses.
+The
+.I offset
+must be a multiple of the alignment of the filter
+(see the table above).
+The default is zero.
+In practice, the default is good; specifying a custom
+.I offset
+is almost never useful.
+.RE
+.TP
+\fB\-\-delta\fR[\fB=\fIoptions\fR]
+Add the Delta filter to the filter chain.
+The Delta filter can be only used as a non-last filter
+in the filter chain.
+.IP ""
+Currently only simple byte-wise delta calculation is supported.
+It can be useful when compressing, for example, uncompressed bitmap images
+or uncompressed PCM audio.
+However, special purpose algorithms may give significantly better
+results than Delta + LZMA2.
+This is true especially with audio,
+which compresses faster and better, for example, with
+.BR flac (1).
+.IP ""
+Supported
+.IR options :
+.RS
+.TP
+.BI dist= distance
+Specify the
+.I distance
+of the delta calculation in bytes.
+.I distance
+must be 1\(en256.
+The default is 1.
+.IP ""
+For example, with
+.B dist=2
+and eight-byte input A1 B1 A2 B3 A3 B5 A4 B7, the output will be
+A1 B1 01 02 01 02 01 02.
+.RE
+.
+.SS "Other options"
+.TP
+.BR \-q ", " \-\-quiet
+Suppress warnings and notices.
+Specify this twice to suppress errors too.
+This option has no effect on the exit status.
+That is, even if a warning was suppressed,
+the exit status to indicate a warning is still used.
+.TP
+.BR \-v ", " \-\-verbose
+Be verbose.
+If standard error is connected to a terminal,
+.B xz
+will display a progress indicator.
+Specifying
+.B \-\-verbose
+twice will give even more verbose output.
+.IP ""
+The progress indicator shows the following information:
+.RS
+.IP \(bu 3
+Completion percentage is shown
+if the size of the input file is known.
+That is, the percentage cannot be shown in pipes.
+.IP \(bu 3
+Amount of compressed data produced (compressing)
+or consumed (decompressing).
+.IP \(bu 3
+Amount of uncompressed data consumed (compressing)
+or produced (decompressing).
+.IP \(bu 3
+Compression ratio, which is calculated by dividing
+the amount of compressed data processed so far by
+the amount of uncompressed data processed so far.
+.IP \(bu 3
+Compression or decompression speed.
+This is measured as the amount of uncompressed data consumed
+(compression) or produced (decompression) per second.
+It is shown after a few seconds have passed since
+.B xz
+started processing the file.
+.IP \(bu 3
+Elapsed time in the format M:SS or H:MM:SS.
+.IP \(bu 3
+Estimated remaining time is shown
+only when the size of the input file is
+known and a couple of seconds have already passed since
+.B xz
+started processing the file.
+The time is shown in a less precise format which
+never has any colons, for example, 2 min 30 s.
+.RE
+.IP ""
+When standard error is not a terminal,
+.B \-\-verbose
+will make
+.B xz
+print the filename, compressed size, uncompressed size,
+compression ratio, and possibly also the speed and elapsed time
+on a single line to standard error after compressing or
+decompressing the file.
+The speed and elapsed time are included only when
+the operation took at least a few seconds.
+If the operation didn't finish, for example, due to user interruption,
+also the completion percentage is printed
+if the size of the input file is known.
+.TP
+.BR \-Q ", " \-\-no\-warn
+Don't set the exit status to 2
+even if a condition worth a warning was detected.
+This option doesn't affect the verbosity level, thus both
+.B \-\-quiet
+and
+.B \-\-no\-warn
+have to be used to not display warnings and
+to not alter the exit status.
+.TP
+.B \-\-robot
+Print messages in a machine-parsable format.
+This is intended to ease writing frontends that want to use
+.B xz
+instead of liblzma, which may be the case with various scripts.
+The output with this option enabled is meant to be stable across
+.B xz
+releases.
+See the section
+.B "ROBOT MODE"
+for details.
+.TP
+.B \-\-info\-memory
+Display, in human-readable format, how much physical memory (RAM)
+and how many processor threads
+.B xz
+thinks the system has and the memory usage limits for compression
+and decompression, and exit successfully.
+.TP
+.BR \-h ", " \-\-help
+Display a help message describing the most commonly used options,
+and exit successfully.
+.TP
+.BR \-H ", " \-\-long\-help
+Display a help message describing all features of
+.BR xz ,
+and exit successfully
+.TP
+.BR \-V ", " \-\-version
+Display the version number of
+.B xz
+and liblzma in human readable format.
+To get machine-parsable output, specify
+.B \-\-robot
+before
+.BR \-\-version .
+.
+.SH "ROBOT MODE"
+The robot mode is activated with the
+.B \-\-robot
+option.
+It makes the output of
+.B xz
+easier to parse by other programs.
+Currently
+.B \-\-robot
+is supported only together with
+.BR \-\-version ,
+.BR \-\-info\-memory ,
+and
+.BR \-\-list .
+It will be supported for compression and
+decompression in the future.
+.
+.SS Version
+.B "xz \-\-robot \-\-version"
+will print the version number of
+.B xz
+and liblzma in the following format:
+.PP
+.BI XZ_VERSION= XYYYZZZS
+.br
+.BI LIBLZMA_VERSION= XYYYZZZS
+.TP
+.I X
+Major version.
+.TP
+.I YYY
+Minor version.
+Even numbers are stable.
+Odd numbers are alpha or beta versions.
+.TP
+.I ZZZ
+Patch level for stable releases or
+just a counter for development releases.
+.TP
+.I S
+Stability.
+0 is alpha, 1 is beta, and 2 is stable.
+.I S
+should be always 2 when
+.I YYY
+is even.
+.PP
+.I XYYYZZZS
+are the same on both lines if
+.B xz
+and liblzma are from the same XZ Utils release.
+.PP
+Examples: 4.999.9beta is
+.B 49990091
+and
+5.0.0 is
+.BR 50000002 .
+.
+.SS "Memory limit information"
+.B "xz \-\-robot \-\-info\-memory"
+prints a single line with three tab-separated columns:
+.IP 1. 4
+Total amount of physical memory (RAM) in bytes.
+.IP 2. 4
+Memory usage limit for compression in bytes
+.RB ( \-\-memlimit\-compress ).
+A special value of
+.B 0
+indicates the default setting
+which for single-threaded mode is the same as no limit.
+.IP 3. 4
+Memory usage limit for decompression in bytes
+.RB ( \-\-memlimit\-decompress ).
+A special value of
+.B 0
+indicates the default setting
+which for single-threaded mode is the same as no limit.
+.IP 4. 4
+Since
+.B xz
+5.3.4alpha:
+Memory usage for multi-threaded decompression in bytes
+.RB ( \-\-memlimit\-mt\-decompress ).
+This is never zero because a system-specific default value
+shown in the column 5
+is used if no limit has been specified explicitly.
+This is also never greater than the value in the column 3
+even if a larger value has been specified with
+.BR \-\-memlimit\-mt\-decompress .
+.IP 5. 4
+Since
+.B xz
+5.3.4alpha:
+A system-specific default memory usage limit
+that is used to limit the number of threads
+when compressing with an automatic number of threads
+.RB ( \-\-threads=0 )
+and no memory usage limit has been specified
+.RB ( \-\-memlimit\-compress ).
+This is also used as the default value for
+.BR \-\-memlimit\-mt\-decompress .
+.IP 6. 4
+Since
+.B xz
+5.3.4alpha:
+Number of available processor threads.
+.PP
+In the future, the output of
+.B "xz \-\-robot \-\-info\-memory"
+may have more columns, but never more than a single line.
+.
+.SS "List mode"
+.B "xz \-\-robot \-\-list"
+uses tab-separated output.
+The first column of every line has a string
+that indicates the type of the information found on that line:
+.TP
+.B name
+This is always the first line when starting to list a file.
+The second column on the line is the filename.
+.TP
+.B file
+This line contains overall information about the
+.B .xz
+file.
+This line is always printed after the
+.B name
+line.
+.TP
+.B stream
+This line type is used only when
+.B \-\-verbose
+was specified.
+There are as many
+.B stream
+lines as there are streams in the
+.B .xz
+file.
+.TP
+.B block
+This line type is used only when
+.B \-\-verbose
+was specified.
+There are as many
+.B block
+lines as there are blocks in the
+.B .xz
+file.
+The
+.B block
+lines are shown after all the
+.B stream
+lines; different line types are not interleaved.
+.TP
+.B summary
+This line type is used only when
+.B \-\-verbose
+was specified twice.
+This line is printed after all
+.B block
+lines.
+Like the
+.B file
+line, the
+.B summary
+line contains overall information about the
+.B .xz
+file.
+.TP
+.B totals
+This line is always the very last line of the list output.
+It shows the total counts and sizes.
+.PP
+The columns of the
+.B file
+lines:
+.PD 0
+.RS
+.IP 2. 4
+Number of streams in the file
+.IP 3. 4
+Total number of blocks in the stream(s)
+.IP 4. 4
+Compressed size of the file
+.IP 5. 4
+Uncompressed size of the file
+.IP 6. 4
+Compression ratio, for example,
+.BR 0.123 .
+If ratio is over 9.999, three dashes
+.RB ( \-\-\- )
+are displayed instead of the ratio.
+.IP 7. 4
+Comma-separated list of integrity check names.
+The following strings are used for the known check types:
+.BR None ,
+.BR CRC32 ,
+.BR CRC64 ,
+and
+.BR SHA\-256 .
+For unknown check types,
+.BI Unknown\- N
+is used, where
+.I N
+is the Check ID as a decimal number (one or two digits).
+.IP 8. 4
+Total size of stream padding in the file
+.RE
+.PD
+.PP
+The columns of the
+.B stream
+lines:
+.PD 0
+.RS
+.IP 2. 4
+Stream number (the first stream is 1)
+.IP 3. 4
+Number of blocks in the stream
+.IP 4. 4
+Compressed start offset
+.IP 5. 4
+Uncompressed start offset
+.IP 6. 4
+Compressed size (does not include stream padding)
+.IP 7. 4
+Uncompressed size
+.IP 8. 4
+Compression ratio
+.IP 9. 4
+Name of the integrity check
+.IP 10. 4
+Size of stream padding
+.RE
+.PD
+.PP
+The columns of the
+.B block
+lines:
+.PD 0
+.RS
+.IP 2. 4
+Number of the stream containing this block
+.IP 3. 4
+Block number relative to the beginning of the stream
+(the first block is 1)
+.IP 4. 4
+Block number relative to the beginning of the file
+.IP 5. 4
+Compressed start offset relative to the beginning of the file
+.IP 6. 4
+Uncompressed start offset relative to the beginning of the file
+.IP 7. 4
+Total compressed size of the block (includes headers)
+.IP 8. 4
+Uncompressed size
+.IP 9. 4
+Compression ratio
+.IP 10. 4
+Name of the integrity check
+.RE
+.PD
+.PP
+If
+.B \-\-verbose
+was specified twice, additional columns are included on the
+.B block
+lines.
+These are not displayed with a single
+.BR \-\-verbose ,
+because getting this information requires many seeks
+and can thus be slow:
+.PD 0
+.RS
+.IP 11. 4
+Value of the integrity check in hexadecimal
+.IP 12. 4
+Block header size
+.IP 13. 4
+Block flags:
+.B c
+indicates that compressed size is present, and
+.B u
+indicates that uncompressed size is present.
+If the flag is not set, a dash
+.RB ( \- )
+is shown instead to keep the string length fixed.
+New flags may be added to the end of the string in the future.
+.IP 14. 4
+Size of the actual compressed data in the block (this excludes
+the block header, block padding, and check fields)
+.IP 15. 4
+Amount of memory (in bytes) required to decompress
+this block with this
+.B xz
+version
+.IP 16. 4
+Filter chain.
+Note that most of the options used at compression time
+cannot be known, because only the options
+that are needed for decompression are stored in the
+.B .xz
+headers.
+.RE
+.PD
+.PP
+The columns of the
+.B summary
+lines:
+.PD 0
+.RS
+.IP 2. 4
+Amount of memory (in bytes) required to decompress
+this file with this
+.B xz
+version
+.IP 3. 4
+.B yes
+or
+.B no
+indicating if all block headers have both compressed size and
+uncompressed size stored in them
+.PP
+.I Since
+.B xz
+.I 5.1.2alpha:
+.IP 4. 4
+Minimum
+.B xz
+version required to decompress the file
+.RE
+.PD
+.PP
+The columns of the
+.B totals
+line:
+.PD 0
+.RS
+.IP 2. 4
+Number of streams
+.IP 3. 4
+Number of blocks
+.IP 4. 4
+Compressed size
+.IP 5. 4
+Uncompressed size
+.IP 6. 4
+Average compression ratio
+.IP 7. 4
+Comma-separated list of integrity check names
+that were present in the files
+.IP 8. 4
+Stream padding size
+.IP 9. 4
+Number of files.
+This is here to
+keep the order of the earlier columns the same as on
+.B file
+lines.
+.PD
+.RE
+.PP
+If
+.B \-\-verbose
+was specified twice, additional columns are included on the
+.B totals
+line:
+.PD 0
+.RS
+.IP 10. 4
+Maximum amount of memory (in bytes) required to decompress
+the files with this
+.B xz
+version
+.IP 11. 4
+.B yes
+or
+.B no
+indicating if all block headers have both compressed size and
+uncompressed size stored in them
+.PP
+.I Since
+.B xz
+.I 5.1.2alpha:
+.IP 12. 4
+Minimum
+.B xz
+version required to decompress the file
+.RE
+.PD
+.PP
+Future versions may add new line types and
+new columns can be added to the existing line types,
+but the existing columns won't be changed.
+.
+.SH "EXIT STATUS"
+.TP
+.B 0
+All is good.
+.TP
+.B 1
+An error occurred.
+.TP
+.B 2
+Something worth a warning occurred,
+but no actual errors occurred.
+.PP
+Notices (not warnings or errors) printed on standard error
+don't affect the exit status.
+.
+.SH ENVIRONMENT
+.B xz
+parses space-separated lists of options
+from the environment variables
+.B XZ_DEFAULTS
+and
+.BR XZ_OPT ,
+in this order, before parsing the options from the command line.
+Note that only options are parsed from the environment variables;
+all non-options are silently ignored.
+Parsing is done with
+.BR getopt_long (3)
+which is used also for the command line arguments.
+.TP
+.B XZ_DEFAULTS
+User-specific or system-wide default options.
+Typically this is set in a shell initialization script to enable
+.BR xz 's
+memory usage limiter by default.
+Excluding shell initialization scripts
+and similar special cases, scripts must never set or unset
+.BR XZ_DEFAULTS .
+.TP
+.B XZ_OPT
+This is for passing options to
+.B xz
+when it is not possible to set the options directly on the
+.B xz
+command line.
+This is the case when
+.B xz
+is run by a script or tool, for example, GNU
+.BR tar (1):
+.RS
+.RS
+.PP
+.nf
+.ft CW
+XZ_OPT=\-2v tar caf foo.tar.xz foo
+.ft R
+.fi
+.RE
+.RE
+.IP ""
+Scripts may use
+.BR XZ_OPT ,
+for example, to set script-specific default compression options.
+It is still recommended to allow users to override
+.B XZ_OPT
+if that is reasonable.
+For example, in
+.BR sh (1)
+scripts one may use something like this:
+.RS
+.RS
+.PP
+.nf
+.ft CW
+XZ_OPT=${XZ_OPT\-"\-7e"}
+export XZ_OPT
+.ft R
+.fi
+.RE
+.RE
+.
+.SH "LZMA UTILS COMPATIBILITY"
+The command line syntax of
+.B xz
+is practically a superset of
+.BR lzma ,
+.BR unlzma ,
+and
+.B lzcat
+as found from LZMA Utils 4.32.x.
+In most cases, it is possible to replace
+LZMA Utils with XZ Utils without breaking existing scripts.
+There are some incompatibilities though,
+which may sometimes cause problems.
+.
+.SS "Compression preset levels"
+The numbering of the compression level presets is not identical in
+.B xz
+and LZMA Utils.
+The most important difference is how dictionary sizes
+are mapped to different presets.
+Dictionary size is roughly equal to the decompressor memory usage.
+.RS
+.PP
+.TS
+tab(;);
+c c c
+c n n.
+Level;xz;LZMA Utils
+\-0;256 KiB;N/A
+\-1;1 MiB;64 KiB
+\-2;2 MiB;1 MiB
+\-3;4 MiB;512 KiB
+\-4;4 MiB;1 MiB
+\-5;8 MiB;2 MiB
+\-6;8 MiB;4 MiB
+\-7;16 MiB;8 MiB
+\-8;32 MiB;16 MiB
+\-9;64 MiB;32 MiB
+.TE
+.RE
+.PP
+The dictionary size differences affect
+the compressor memory usage too,
+but there are some other differences between
+LZMA Utils and XZ Utils, which
+make the difference even bigger:
+.RS
+.PP
+.TS
+tab(;);
+c c c
+c n n.
+Level;xz;LZMA Utils 4.32.x
+\-0;3 MiB;N/A
+\-1;9 MiB;2 MiB
+\-2;17 MiB;12 MiB
+\-3;32 MiB;12 MiB
+\-4;48 MiB;16 MiB
+\-5;94 MiB;26 MiB
+\-6;94 MiB;45 MiB
+\-7;186 MiB;83 MiB
+\-8;370 MiB;159 MiB
+\-9;674 MiB;311 MiB
+.TE
+.RE
+.PP
+The default preset level in LZMA Utils is
+.B \-7
+while in XZ Utils it is
+.BR \-6 ,
+so both use an 8 MiB dictionary by default.
+.
+.SS "Streamed vs. non-streamed .lzma files"
+The uncompressed size of the file can be stored in the
+.B .lzma
+header.
+LZMA Utils does that when compressing regular files.
+The alternative is to mark that uncompressed size is unknown
+and use end-of-payload marker to indicate
+where the decompressor should stop.
+LZMA Utils uses this method when uncompressed size isn't known,
+which is the case, for example, in pipes.
+.PP
+.B xz
+supports decompressing
+.B .lzma
+files with or without end-of-payload marker, but all
+.B .lzma
+files created by
+.B xz
+will use end-of-payload marker and have uncompressed size
+marked as unknown in the
+.B .lzma
+header.
+This may be a problem in some uncommon situations.
+For example, a
+.B .lzma
+decompressor in an embedded device might work
+only with files that have known uncompressed size.
+If you hit this problem, you need to use LZMA Utils
+or LZMA SDK to create
+.B .lzma
+files with known uncompressed size.
+.
+.SS "Unsupported .lzma files"
+The
+.B .lzma
+format allows
+.I lc
+values up to 8, and
+.I lp
+values up to 4.
+LZMA Utils can decompress files with any
+.I lc
+and
+.IR lp ,
+but always creates files with
+.B lc=3
+and
+.BR lp=0 .
+Creating files with other
+.I lc
+and
+.I lp
+is possible with
+.B xz
+and with LZMA SDK.
+.PP
+The implementation of the LZMA1 filter in liblzma
+requires that the sum of
+.I lc
+and
+.I lp
+must not exceed 4.
+Thus,
+.B .lzma
+files, which exceed this limitation, cannot be decompressed with
+.BR xz .
+.PP
+LZMA Utils creates only
+.B .lzma
+files which have a dictionary size of
+.RI "2^" n
+(a power of 2) but accepts files with any dictionary size.
+liblzma accepts only
+.B .lzma
+files which have a dictionary size of
+.RI "2^" n
+or
+.RI "2^" n " + 2^(" n "\-1)."
+This is to decrease false positives when detecting
+.B .lzma
+files.
+.PP
+These limitations shouldn't be a problem in practice,
+since practically all
+.B .lzma
+files have been compressed with settings that liblzma will accept.
+.
+.SS "Trailing garbage"
+When decompressing,
+LZMA Utils silently ignore everything after the first
+.B .lzma
+stream.
+In most situations, this is a bug.
+This also means that LZMA Utils
+don't support decompressing concatenated
+.B .lzma
+files.
+.PP
+If there is data left after the first
+.B .lzma
+stream,
+.B xz
+considers the file to be corrupt unless
+.B \-\-single\-stream
+was used.
+This may break obscure scripts which have
+assumed that trailing garbage is ignored.
+.
+.SH NOTES
+.
+.SS "Compressed output may vary"
+The exact compressed output produced from
+the same uncompressed input file
+may vary between XZ Utils versions even if
+compression options are identical.
+This is because the encoder can be improved
+(faster or better compression)
+without affecting the file format.
+The output can vary even between different
+builds of the same XZ Utils version,
+if different build options are used.
+.PP
+The above means that once
+.B \-\-rsyncable
+has been implemented,
+the resulting files won't necessarily be rsyncable
+unless both old and new files have been compressed
+with the same xz version.
+This problem can be fixed if a part of the encoder
+implementation is frozen to keep rsyncable output
+stable across xz versions.
+.
+.SS "Embedded .xz decompressors"
+Embedded
+.B .xz
+decompressor implementations like XZ Embedded don't necessarily
+support files created with integrity
+.I check
+types other than
+.B none
+and
+.BR crc32 .
+Since the default is
+.BR \-\-check=crc64 ,
+you must use
+.B \-\-check=none
+or
+.B \-\-check=crc32
+when creating files for embedded systems.
+.PP
+Outside embedded systems, all
+.B .xz
+format decompressors support all the
+.I check
+types, or at least are able to decompress
+the file without verifying the
+integrity check if the particular
+.I check
+is not supported.
+.PP
+XZ Embedded supports BCJ filters,
+but only with the default start offset.
+.
+.SH EXAMPLES
+.
+.SS Basics
+Compress the file
+.I foo
+into
+.I foo.xz
+using the default compression level
+.RB ( \-6 ),
+and remove
+.I foo
+if compression is successful:
+.RS
+.PP
+.nf
+.ft CW
+xz foo
+.ft R
+.fi
+.RE
+.PP
+Decompress
+.I bar.xz
+into
+.I bar
+and don't remove
+.I bar.xz
+even if decompression is successful:
+.RS
+.PP
+.nf
+.ft CW
+xz \-dk bar.xz
+.ft R
+.fi
+.RE
+.PP
+Create
+.I baz.tar.xz
+with the preset
+.B \-4e
+.RB ( "\-4 \-\-extreme" ),
+which is slower than the default
+.BR \-6 ,
+but needs less memory for compression and decompression (48\ MiB
+and 5\ MiB, respectively):
+.RS
+.PP
+.nf
+.ft CW
+tar cf \- baz | xz \-4e > baz.tar.xz
+.ft R
+.fi
+.RE
+.PP
+A mix of compressed and uncompressed files can be decompressed
+to standard output with a single command:
+.RS
+.PP
+.nf
+.ft CW
+xz \-dcf a.txt b.txt.xz c.txt d.txt.lzma > abcd.txt
+.ft R
+.fi
+.RE
+.
+.SS "Parallel compression of many files"
+On GNU and *BSD,
+.BR find (1)
+and
+.BR xargs (1)
+can be used to parallelize compression of many files:
+.RS
+.PP
+.nf
+.ft CW
+find . \-type f \e! \-name '*.xz' \-print0 \e
+    | xargs \-0r \-P4 \-n16 xz \-T1
+.ft R
+.fi
+.RE
+.PP
+The
+.B \-P
+option to
+.BR xargs (1)
+sets the number of parallel
+.B xz
+processes.
+The best value for the
+.B \-n
+option depends on how many files there are to be compressed.
+If there are only a couple of files,
+the value should probably be 1;
+with tens of thousands of files,
+100 or even more may be appropriate to reduce the number of
+.B xz
+processes that
+.BR xargs (1)
+will eventually create.
+.PP
+The option
+.B \-T1
+for
+.B xz
+is there to force it to single-threaded mode, because
+.BR xargs (1)
+is used to control the amount of parallelization.
+.
+.SS "Robot mode"
+Calculate how many bytes have been saved in total
+after compressing multiple files:
+.RS
+.PP
+.nf
+.ft CW
+xz \-\-robot \-\-list *.xz | awk '/^totals/{print $5\-$4}'
+.ft R
+.fi
+.RE
+.PP
+A script may want to know that it is using new enough
+.BR xz .
+The following
+.BR sh (1)
+script checks that the version number of the
+.B xz
+tool is at least 5.0.0.
+This method is compatible with old beta versions,
+which didn't support the
+.B \-\-robot
+option:
+.RS
+.PP
+.nf
+.ft CW
+if ! eval "$(xz \-\-robot \-\-version 2> /dev/null)" ||
+        [ "$XZ_VERSION" \-lt 50000002 ]; then
+    echo "Your xz is too old."
+fi
+unset XZ_VERSION LIBLZMA_VERSION
+.ft R
+.fi
+.RE
+.PP
+Set a memory usage limit for decompression using
+.BR XZ_OPT ,
+but if a limit has already been set, don't increase it:
+.RS
+.PP
+.nf
+.ft CW
+NEWLIM=$((123 << 20))\ \ # 123 MiB
+OLDLIM=$(xz \-\-robot \-\-info\-memory | cut \-f3)
+if [ $OLDLIM \-eq 0 \-o $OLDLIM \-gt $NEWLIM ]; then
+    XZ_OPT="$XZ_OPT \-\-memlimit\-decompress=$NEWLIM"
+    export XZ_OPT
+fi
+.ft R
+.fi
+.RE
+.
+.SS "Custom compressor filter chains"
+The simplest use for custom filter chains is
+customizing a LZMA2 preset.
+This can be useful,
+because the presets cover only a subset of the
+potentially useful combinations of compression settings.
+.PP
+The CompCPU columns of the tables
+from the descriptions of the options
+.BR "\-0" " ... " "\-9"
+and
+.B \-\-extreme
+are useful when customizing LZMA2 presets.
+Here are the relevant parts collected from those two tables:
+.RS
+.PP
+.TS
+tab(;);
+c c
+n n.
+Preset;CompCPU
+\-0;0
+\-1;1
+\-2;2
+\-3;3
+\-4;4
+\-5;5
+\-6;6
+\-5e;7
+\-6e;8
+.TE
+.RE
+.PP
+If you know that a file requires
+somewhat big dictionary (for example, 32\ MiB) to compress well,
+but you want to compress it quicker than
+.B "xz \-8"
+would do, a preset with a low CompCPU value (for example, 1)
+can be modified to use a bigger dictionary:
+.RS
+.PP
+.nf
+.ft CW
+xz \-\-lzma2=preset=1,dict=32MiB foo.tar
+.ft R
+.fi
+.RE
+.PP
+With certain files, the above command may be faster than
+.B "xz \-6"
+while compressing significantly better.
+However, it must be emphasized that only some files benefit from
+a big dictionary while keeping the CompCPU value low.
+The most obvious situation,
+where a big dictionary can help a lot,
+is an archive containing very similar files
+of at least a few megabytes each.
+The dictionary size has to be significantly bigger
+than any individual file to allow LZMA2 to take
+full advantage of the similarities between consecutive files.
+.PP
+If very high compressor and decompressor memory usage is fine,
+and the file being compressed is
+at least several hundred megabytes, it may be useful
+to use an even bigger dictionary than the 64 MiB that
+.B "xz \-9"
+would use:
+.RS
+.PP
+.nf
+.ft CW
+xz \-vv \-\-lzma2=dict=192MiB big_foo.tar
+.ft R
+.fi
+.RE
+.PP
+Using
+.B \-vv
+.RB ( "\-\-verbose \-\-verbose" )
+like in the above example can be useful
+to see the memory requirements
+of the compressor and decompressor.
+Remember that using a dictionary bigger than
+the size of the uncompressed file is waste of memory,
+so the above command isn't useful for small files.
+.PP
+Sometimes the compression time doesn't matter,
+but the decompressor memory usage has to be kept low, for example,
+to make it possible to decompress the file on an embedded system.
+The following command uses
+.B \-6e
+.RB ( "\-6 \-\-extreme" )
+as a base and sets the dictionary to only 64\ KiB.
+The resulting file can be decompressed with XZ Embedded
+(that's why there is
+.BR \-\-check=crc32 )
+using about 100\ KiB of memory.
+.RS
+.PP
+.nf
+.ft CW
+xz \-\-check=crc32 \-\-lzma2=preset=6e,dict=64KiB foo
+.ft R
+.fi
+.RE
+.PP
+If you want to squeeze out as many bytes as possible,
+adjusting the number of literal context bits
+.RI ( lc )
+and number of position bits
+.RI ( pb )
+can sometimes help.
+Adjusting the number of literal position bits
+.RI ( lp )
+might help too, but usually
+.I lc
+and
+.I pb
+are more important.
+For example, a source code archive contains mostly US-ASCII text,
+so something like the following might give
+slightly (like 0.1\ %) smaller file than
+.B "xz \-6e"
+(try also without
+.BR lc=4 ):
+.RS
+.PP
+.nf
+.ft CW
+xz \-\-lzma2=preset=6e,pb=0,lc=4 source_code.tar
+.ft R
+.fi
+.RE
+.PP
+Using another filter together with LZMA2 can improve
+compression with certain file types.
+For example, to compress a x86-32 or x86-64 shared library
+using the x86 BCJ filter:
+.RS
+.PP
+.nf
+.ft CW
+xz \-\-x86 \-\-lzma2 libfoo.so
+.ft R
+.fi
+.RE
+.PP
+Note that the order of the filter options is significant.
+If
+.B \-\-x86
+is specified after
+.BR \-\-lzma2 ,
+.B xz
+will give an error,
+because there cannot be any filter after LZMA2,
+and also because the x86 BCJ filter cannot be used
+as the last filter in the chain.
+.PP
+The Delta filter together with LZMA2
+can give good results with bitmap images.
+It should usually beat PNG,
+which has a few more advanced filters than simple
+delta but uses Deflate for the actual compression.
+.PP
+The image has to be saved in uncompressed format,
+for example, as uncompressed TIFF.
+The distance parameter of the Delta filter is set
+to match the number of bytes per pixel in the image.
+For example, 24-bit RGB bitmap needs
+.BR dist=3 ,
+and it is also good to pass
+.B pb=0
+to LZMA2 to accommodate the three-byte alignment:
+.RS
+.PP
+.nf
+.ft CW
+xz \-\-delta=dist=3 \-\-lzma2=pb=0 foo.tiff
+.ft R
+.fi
+.RE
+.PP
+If multiple images have been put into a single archive (for example,
+.BR .tar ),
+the Delta filter will work on that too as long as all images
+have the same number of bytes per pixel.
+.
+.SH "SEE ALSO"
+.BR xzdec (1),
+.BR xzdiff (1),
+.BR xzgrep (1),
+.BR xzless (1),
+.BR xzmore (1),
+.BR gzip (1),
+.BR bzip2 (1),
+.BR 7z (1)
+.PP
+XZ Utils: <https://tukaani.org/xz/>
+.br
+XZ Embedded: <https://tukaani.org/xz/embedded.html>
+.br
+LZMA SDK: <http://7-zip.org/sdk.html>
diff --git a/src/xz/xz_w32res.rc b/src/xz/xz_w32res.rc
new file mode 100644
index 0000000..bad3020
--- /dev/null
+++ b/src/xz/xz_w32res.rc
@@ -0,0 +1,12 @@
+/*
+ * Author: Lasse Collin
+ *
+ * This file has been put into the public domain.
+ * You can do whatever you want with this file.
+ */
+
+#define MY_TYPE VFT_APP
+#define MY_NAME "xz"
+#define MY_SUFFIX ".exe"
+#define MY_DESC "xz data compression tool for .xz and .lzma files"
+#include "common_w32res.rc"
diff --git a/src/xzdec/Makefile.am b/src/xzdec/Makefile.am
new file mode 100644
index 0000000..90f1e92
--- /dev/null
+++ b/src/xzdec/Makefile.am
@@ -0,0 +1,111 @@
+##
+## Author: Lasse Collin
+##
+## This file has been put into the public domain.
+## You can do whatever you want with this file.
+##
+
+# Windows resource compiler support. It's fine to use xz_CPPFLAGS
+# also for lzmadec.
+.rc.o:
+	$(RC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
+		$(xzdec_CPPFLAGS) $(CPPFLAGS) $(RCFLAGS) -i $< -o $@
+
+
+xzdec_SOURCES = \
+	xzdec.c \
+	../common/tuklib_progname.c \
+	../common/tuklib_exit.c
+
+if COND_W32
+xzdec_SOURCES += xzdec_w32res.rc
+endif
+
+xzdec_CPPFLAGS = \
+	-DTUKLIB_GETTEXT=0 \
+	-I$(top_srcdir)/src/common \
+	-I$(top_srcdir)/src/liblzma/api \
+	-I$(top_builddir)/lib
+xzdec_LDADD = $(top_builddir)/src/liblzma/liblzma.la
+
+if COND_GNULIB
+xzdec_LDADD += $(top_builddir)/lib/libgnu.a
+endif
+
+xzdec_LDADD += $(LTLIBINTL)
+
+
+lzmadec_SOURCES = \
+	xzdec.c \
+	../common/tuklib_progname.c \
+	../common/tuklib_exit.c
+
+if COND_W32
+lzmadec_SOURCES += lzmadec_w32res.rc
+endif
+
+lzmadec_CPPFLAGS = $(xzdec_CPPFLAGS) -DLZMADEC
+lzmadec_LDFLAGS = $(xzdec_LDFLAGS)
+lzmadec_LDADD = $(xzdec_LDADD)
+
+
+bin_PROGRAMS =
+lzmadecmanlink =
+
+if COND_XZDEC
+bin_PROGRAMS += xzdec
+dist_man_MANS = xzdec.1
+endif
+
+if COND_LZMADEC
+bin_PROGRAMS += lzmadec
+
+# Create the symlink lzmadec.1->xzdec.1 only if xzdec.1 was installed.
+# This is better than creating a dangling symlink. The correct solution
+# would be to install xzdec.1 as lzmadec.1 but this code is already too
+# complicated so I won't do it. Installing only lzmadec is a bit unusual
+# situation anyway so it's not that important.
+if COND_XZDEC
+lzmadecmanlink += lzmadec
+endif
+endif
+
+if COND_XZDEC
+# The installation of translated man pages abuses Automake internals
+# by calling "install-man" with redefined dist_man_MANS and man_MANS.
+# If this breaks some day, don't blame Automake developers.
+install-data-hook:
+	languages= ; \
+	if test "$(USE_NLS)" = yes && test -d "$(top_srcdir)/po4a/man"; then \
+		languages=`ls "$(top_srcdir)/po4a/man"`; \
+	fi; \
+	target=`echo xzdec | sed '$(transform)'` && \
+	link=`echo lzmadec | sed '$(transform)'` && \
+	for lang in . $$languages; do \
+		man="$(top_srcdir)/po4a/man/$$lang/xzdec.1" ; \
+		if test -f "$$man"; then \
+			$(MAKE) dist_man_MANS="$$man" man_MANS= \
+				mandir="$(mandir)/$$lang" install-man; \
+		fi; \
+		man1dir="$(DESTDIR)$(mandir)/$$lang/man1" && \
+		if test -f "$$man1dir/$$target.1"; then \
+			if test -n "$(lzmadecmanlink)"; then ( \
+				cd "$$man1dir" && \
+				rm -f "$$link.1" && \
+				$(LN_S) "$$target.1" "$$link.1" \
+			); fi; \
+		fi; \
+	done
+
+uninstall-hook:
+	languages= ; \
+	if test "$(USE_NLS)" = yes && test -d "$(top_srcdir)/po4a/man"; then \
+		languages=`ls "$(top_srcdir)/po4a/man"`; \
+	fi; \
+	for lang in . $$languages; do \
+		for name in xzdec $(lzmadecmanlink); do \
+			name=`echo $$name | sed '$(transform)'` && \
+			rm -f "$(DESTDIR)$(mandir)/$$lang/man1/$$name.1"; \
+		done; \
+	done
+endif
diff --git a/src/xzdec/Makefile.in b/src/xzdec/Makefile.in
new file mode 100644
index 0000000..b05cff1
--- /dev/null
+++ b/src/xzdec/Makefile.in
@@ -0,0 +1,969 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
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+  fi; \
+}
+am__make_running_with_option = \
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+# Create the symlink lzmadec.1->xzdec.1 only if xzdec.1 was installed.
+# This is better than creating a dangling symlink. The correct solution
+# would be to install xzdec.1 as lzmadec.1 but this code is already too
+# complicated so I won't do it. Installing only lzmadec is a bit unusual
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+@COND_LZMADEC_TRUE@@COND_XZDEC_TRUE@am__append_6 = lzmadec
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+
+xzdec-tuklib_progname.obj: ../common/tuklib_progname.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(xzdec_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT xzdec-tuklib_progname.obj -MD -MP -MF $(DEPDIR)/xzdec-tuklib_progname.Tpo -c -o xzdec-tuklib_progname.obj `if test -f '../common/tuklib_progname.c'; then $(CYGPATH_W) '../common/tuklib_progname.c'; else $(CYGPATH_W) '$(srcdir)/../common/tuklib_progname.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/xzdec-tuklib_progname.Tpo $(DEPDIR)/xzdec-tuklib_progname.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='../common/tuklib_progname.c' object='xzdec-tuklib_progname.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(xzdec_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o xzdec-tuklib_progname.obj `if test -f '../common/tuklib_progname.c'; then $(CYGPATH_W) '../common/tuklib_progname.c'; else $(CYGPATH_W) '$(srcdir)/../common/tuklib_progname.c'; fi`
+
+xzdec-tuklib_exit.o: ../common/tuklib_exit.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(xzdec_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT xzdec-tuklib_exit.o -MD -MP -MF $(DEPDIR)/xzdec-tuklib_exit.Tpo -c -o xzdec-tuklib_exit.o `test -f '../common/tuklib_exit.c' || echo '$(srcdir)/'`../common/tuklib_exit.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/xzdec-tuklib_exit.Tpo $(DEPDIR)/xzdec-tuklib_exit.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='../common/tuklib_exit.c' object='xzdec-tuklib_exit.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(xzdec_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o xzdec-tuklib_exit.o `test -f '../common/tuklib_exit.c' || echo '$(srcdir)/'`../common/tuklib_exit.c
+
+xzdec-tuklib_exit.obj: ../common/tuklib_exit.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(xzdec_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT xzdec-tuklib_exit.obj -MD -MP -MF $(DEPDIR)/xzdec-tuklib_exit.Tpo -c -o xzdec-tuklib_exit.obj `if test -f '../common/tuklib_exit.c'; then $(CYGPATH_W) '../common/tuklib_exit.c'; else $(CYGPATH_W) '$(srcdir)/../common/tuklib_exit.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/xzdec-tuklib_exit.Tpo $(DEPDIR)/xzdec-tuklib_exit.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='../common/tuklib_exit.c' object='xzdec-tuklib_exit.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(xzdec_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o xzdec-tuklib_exit.obj `if test -f '../common/tuklib_exit.c'; then $(CYGPATH_W) '../common/tuklib_exit.c'; else $(CYGPATH_W) '$(srcdir)/../common/tuklib_exit.c'; fi`
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+install-man1: $(dist_man_MANS)
+	@$(NORMAL_INSTALL)
+	@list1=''; \
+	list2='$(dist_man_MANS)'; \
+	test -n "$(man1dir)" \
+	  && test -n "`echo $$list1$$list2`" \
+	  || exit 0; \
+	echo " $(MKDIR_P) '$(DESTDIR)$(man1dir)'"; \
+	$(MKDIR_P) "$(DESTDIR)$(man1dir)" || exit 1; \
+	{ for i in $$list1; do echo "$$i"; done;  \
+	if test -n "$$list2"; then \
+	  for i in $$list2; do echo "$$i"; done \
+	    | sed -n '/\.1[a-z]*$$/p'; \
+	fi; \
+	} | while read p; do \
+	  if test -f $$p; then d=; else d="$(srcdir)/"; fi; \
+	  echo "$$d$$p"; echo "$$p"; \
+	done | \
+	sed -e 'n;s,.*/,,;p;h;s,.*\.,,;s,^[^1][0-9a-z]*$$,1,;x' \
+	      -e 's,\.[0-9a-z]*$$,,;$(transform);G;s,\n,.,' | \
+	sed 'N;N;s,\n, ,g' | { \
+	list=; while read file base inst; do \
+	  if test "$$base" = "$$inst"; then list="$$list $$file"; else \
+	    echo " $(INSTALL_DATA) '$$file' '$(DESTDIR)$(man1dir)/$$inst'"; \
+	    $(INSTALL_DATA) "$$file" "$(DESTDIR)$(man1dir)/$$inst" || exit $$?; \
+	  fi; \
+	done; \
+	for i in $$list; do echo "$$i"; done | $(am__base_list) | \
+	while read files; do \
+	  test -z "$$files" || { \
+	    echo " $(INSTALL_DATA) $$files '$(DESTDIR)$(man1dir)'"; \
+	    $(INSTALL_DATA) $$files "$(DESTDIR)$(man1dir)" || exit $$?; }; \
+	done; }
+
+uninstall-man1:
+	@$(NORMAL_UNINSTALL)
+	@list=''; test -n "$(man1dir)" || exit 0; \
+	files=`{ for i in $$list; do echo "$$i"; done; \
+	l2='$(dist_man_MANS)'; for i in $$l2; do echo "$$i"; done | \
+	  sed -n '/\.1[a-z]*$$/p'; \
+	} | sed -e 's,.*/,,;h;s,.*\.,,;s,^[^1][0-9a-z]*$$,1,;x' \
+	      -e 's,\.[0-9a-z]*$$,,;$(transform);G;s,\n,.,'`; \
+	dir='$(DESTDIR)$(man1dir)'; $(am__uninstall_files_from_dir)
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	$(am__define_uniq_tagged_files); \
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+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
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+	     $$unique
+
+GTAGS:
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+
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(PROGRAMS) $(MANS)
+installdirs:
+	for dir in "$(DESTDIR)$(bindir)" "$(DESTDIR)$(man1dir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+@COND_XZDEC_FALSE@install-data-hook:
+@COND_XZDEC_FALSE@uninstall-hook:
+clean: clean-am
+
+clean-am: clean-binPROGRAMS clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/lzmadec-tuklib_exit.Po
+	-rm -f ./$(DEPDIR)/lzmadec-tuklib_progname.Po
+	-rm -f ./$(DEPDIR)/lzmadec-xzdec.Po
+	-rm -f ./$(DEPDIR)/xzdec-tuklib_exit.Po
+	-rm -f ./$(DEPDIR)/xzdec-tuklib_progname.Po
+	-rm -f ./$(DEPDIR)/xzdec-xzdec.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-man
+	@$(NORMAL_INSTALL)
+	$(MAKE) $(AM_MAKEFLAGS) install-data-hook
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-binPROGRAMS
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man: install-man1
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/lzmadec-tuklib_exit.Po
+	-rm -f ./$(DEPDIR)/lzmadec-tuklib_progname.Po
+	-rm -f ./$(DEPDIR)/lzmadec-xzdec.Po
+	-rm -f ./$(DEPDIR)/xzdec-tuklib_exit.Po
+	-rm -f ./$(DEPDIR)/xzdec-tuklib_progname.Po
+	-rm -f ./$(DEPDIR)/xzdec-xzdec.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-binPROGRAMS uninstall-man
+	@$(NORMAL_INSTALL)
+	$(MAKE) $(AM_MAKEFLAGS) uninstall-hook
+uninstall-man: uninstall-man1
+
+.MAKE: install-am install-data-am install-strip uninstall-am
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-binPROGRAMS clean-generic clean-libtool cscopelist-am \
+	ctags ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-binPROGRAMS \
+	install-data install-data-am install-data-hook install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-man1 install-pdf install-pdf-am install-ps \
+	install-ps-am install-strip installcheck installcheck-am \
+	installdirs maintainer-clean maintainer-clean-generic \
+	mostlyclean mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-binPROGRAMS uninstall-hook \
+	uninstall-man uninstall-man1
+
+.PRECIOUS: Makefile
+
+
+# Windows resource compiler support. It's fine to use xz_CPPFLAGS
+# also for lzmadec.
+.rc.o:
+	$(RC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
+		$(xzdec_CPPFLAGS) $(CPPFLAGS) $(RCFLAGS) -i $< -o $@
+
+# The installation of translated man pages abuses Automake internals
+# by calling "install-man" with redefined dist_man_MANS and man_MANS.
+# If this breaks some day, don't blame Automake developers.
+@COND_XZDEC_TRUE@install-data-hook:
+@COND_XZDEC_TRUE@	languages= ; \
+@COND_XZDEC_TRUE@	if test "$(USE_NLS)" = yes && test -d "$(top_srcdir)/po4a/man"; then \
+@COND_XZDEC_TRUE@		languages=`ls "$(top_srcdir)/po4a/man"`; \
+@COND_XZDEC_TRUE@	fi; \
+@COND_XZDEC_TRUE@	target=`echo xzdec | sed '$(transform)'` && \
+@COND_XZDEC_TRUE@	link=`echo lzmadec | sed '$(transform)'` && \
+@COND_XZDEC_TRUE@	for lang in . $$languages; do \
+@COND_XZDEC_TRUE@		man="$(top_srcdir)/po4a/man/$$lang/xzdec.1" ; \
+@COND_XZDEC_TRUE@		if test -f "$$man"; then \
+@COND_XZDEC_TRUE@			$(MAKE) dist_man_MANS="$$man" man_MANS= \
+@COND_XZDEC_TRUE@				mandir="$(mandir)/$$lang" install-man; \
+@COND_XZDEC_TRUE@		fi; \
+@COND_XZDEC_TRUE@		man1dir="$(DESTDIR)$(mandir)/$$lang/man1" && \
+@COND_XZDEC_TRUE@		if test -f "$$man1dir/$$target.1"; then \
+@COND_XZDEC_TRUE@			if test -n "$(lzmadecmanlink)"; then ( \
+@COND_XZDEC_TRUE@				cd "$$man1dir" && \
+@COND_XZDEC_TRUE@				rm -f "$$link.1" && \
+@COND_XZDEC_TRUE@				$(LN_S) "$$target.1" "$$link.1" \
+@COND_XZDEC_TRUE@			); fi; \
+@COND_XZDEC_TRUE@		fi; \
+@COND_XZDEC_TRUE@	done
+
+@COND_XZDEC_TRUE@uninstall-hook:
+@COND_XZDEC_TRUE@	languages= ; \
+@COND_XZDEC_TRUE@	if test "$(USE_NLS)" = yes && test -d "$(top_srcdir)/po4a/man"; then \
+@COND_XZDEC_TRUE@		languages=`ls "$(top_srcdir)/po4a/man"`; \
+@COND_XZDEC_TRUE@	fi; \
+@COND_XZDEC_TRUE@	for lang in . $$languages; do \
+@COND_XZDEC_TRUE@		for name in xzdec $(lzmadecmanlink); do \
+@COND_XZDEC_TRUE@			name=`echo $$name | sed '$(transform)'` && \
+@COND_XZDEC_TRUE@			rm -f "$(DESTDIR)$(mandir)/$$lang/man1/$$name.1"; \
+@COND_XZDEC_TRUE@		done; \
+@COND_XZDEC_TRUE@	done
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/xzdec/lzmadec_w32res.rc b/src/xzdec/lzmadec_w32res.rc
new file mode 100644
index 0000000..b85962d
--- /dev/null
+++ b/src/xzdec/lzmadec_w32res.rc
@@ -0,0 +1,12 @@
+/*
+ * Author: Lasse Collin
+ *
+ * This file has been put into the public domain.
+ * You can do whatever you want with this file.
+ */
+
+#define MY_TYPE VFT_APP
+#define MY_NAME "lzmadec"
+#define MY_SUFFIX ".exe"
+#define MY_DESC "lzmadec decompression tool for .lzma files"
+#include "common_w32res.rc"
diff --git a/src/xzdec/xzdec.1 b/src/xzdec/xzdec.1
new file mode 100644
index 0000000..78bc9b4
--- /dev/null
+++ b/src/xzdec/xzdec.1
@@ -0,0 +1,146 @@
+.\"
+.\" Author: Lasse Collin
+.\"
+.\" This file has been put into the public domain.
+.\" You can do whatever you want with this file.
+.\"
+.TH XZDEC 1 "2017-04-19" "Tukaani" "XZ Utils"
+.SH NAME
+xzdec, lzmadec \- Small .xz and .lzma decompressors
+.SH SYNOPSIS
+.B xzdec
+.RI [ option... ]
+.RI [ file... ]
+.br
+.B lzmadec
+.RI [ option... ]
+.RI [ file... ]
+.SH DESCRIPTION
+.B xzdec
+is a liblzma-based decompression-only tool for
+.B .xz
+(and only
+.BR .xz )
+files.
+.B xzdec
+is intended to work as a drop-in replacement for
+.BR xz (1)
+in the most common situations where a script
+has been written to use
+.B "xz \-\-decompress \-\-stdout"
+(and possibly a few other commonly used options) to decompress
+.B .xz
+files.
+.B lzmadec
+is identical to
+.B xzdec
+except that
+.B lzmadec
+supports
+.B .lzma
+files instead of
+.B .xz
+files.
+.PP
+To reduce the size of the executable,
+.B xzdec
+doesn't support multithreading or localization,
+and doesn't read options from
+.B XZ_DEFAULTS
+and
+.B XZ_OPT
+environment variables.
+.B xzdec
+doesn't support displaying intermediate progress information: sending
+.B SIGINFO
+to
+.B xzdec
+does nothing, but sending
+.B SIGUSR1
+terminates the process instead of displaying progress information.
+.SH OPTIONS
+.TP
+.BR \-d ", " \-\-decompress ", " \-\-uncompress
+Ignored for
+.BR xz (1)
+compatibility.
+.B xzdec
+supports only decompression.
+.TP
+.BR \-k ", " \-\-keep
+Ignored for
+.BR xz (1)
+compatibility.
+.B xzdec
+never creates or removes any files.
+.TP
+.BR \-c ", " \-\-stdout ", " \-\-to-stdout
+Ignored for
+.BR xz (1)
+compatibility.
+.B xzdec
+always writes the decompressed data to standard output.
+.TP
+.BR \-q ", " \-\-quiet
+Specifying this once does nothing since
+.B xzdec
+never displays any warnings or notices.
+Specify this twice to suppress errors.
+.TP
+.BR \-Q ", " \-\-no-warn
+Ignored for
+.BR xz (1)
+compatibility.
+.B xzdec
+never uses the exit status 2.
+.TP
+.BR \-h ", " \-\-help
+Display a help message and exit successfully.
+.TP
+.BR \-V ", " \-\-version
+Display the version number of
+.B xzdec
+and liblzma.
+.SH "EXIT STATUS"
+.TP
+.B 0
+All was good.
+.TP
+.B 1
+An error occurred.
+.PP
+.B xzdec
+doesn't have any warning messages like
+.BR xz (1)
+has, thus the exit status 2 is not used by
+.BR xzdec .
+.SH NOTES
+Use
+.BR xz (1)
+instead of
+.B xzdec
+or
+.B lzmadec
+for normal everyday use.
+.B xzdec
+or
+.B lzmadec
+are meant only for situations where it is important to have
+a smaller decompressor than the full-featured
+.BR xz (1).
+.PP
+.B xzdec
+and
+.B lzmadec
+are not really that small.
+The size can be reduced further by dropping
+features from liblzma at compile time,
+but that shouldn't usually be done for executables distributed
+in typical non-embedded operating system distributions.
+If you need a truly small
+.B .xz
+decompressor, consider using XZ Embedded.
+.SH "SEE ALSO"
+.BR xz (1)
+.PP
+XZ Embedded: <https://tukaani.org/xz/embedded.html>
diff --git a/src/xzdec/xzdec.c b/src/xzdec/xzdec.c
new file mode 100644
index 0000000..c1bd199
--- /dev/null
+++ b/src/xzdec/xzdec.c
@@ -0,0 +1,323 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       xzdec.c
+/// \brief      Simple single-threaded tool to uncompress .xz or .lzma files
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "sysdefs.h"
+#include "lzma.h"
+
+#include <stdarg.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "getopt.h"
+#include "tuklib_progname.h"
+#include "tuklib_exit.h"
+
+#ifdef TUKLIB_DOSLIKE
+#	include <fcntl.h>
+#	include <io.h>
+#endif
+
+
+#ifdef LZMADEC
+#	define TOOL_FORMAT "lzma"
+#else
+#	define TOOL_FORMAT "xz"
+#endif
+
+
+/// Error messages are suppressed if this is zero, which is the case when
+/// --quiet has been given at least twice.
+static int display_errors = 2;
+
+
+static void lzma_attribute((__format__(__printf__, 1, 2)))
+my_errorf(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+
+	if (display_errors) {
+		fprintf(stderr, "%s: ", progname);
+		vfprintf(stderr, fmt, ap);
+		fprintf(stderr, "\n");
+	}
+
+	va_end(ap);
+	return;
+}
+
+
+static void lzma_attribute((__noreturn__))
+help(void)
+{
+	printf(
+"Usage: %s [OPTION]... [FILE]...\n"
+"Decompress files in the ." TOOL_FORMAT " format to standard output.\n"
+"\n"
+"  -d, --decompress   (ignored, only decompression is supported)\n"
+"  -k, --keep         (ignored, files are never deleted)\n"
+"  -c, --stdout       (ignored, output is always written to standard output)\n"
+"  -q, --quiet        specify *twice* to suppress errors\n"
+"  -Q, --no-warn      (ignored, the exit status 2 is never used)\n"
+"  -h, --help         display this help and exit\n"
+"  -V, --version      display the version number and exit\n"
+"\n"
+"With no FILE, or when FILE is -, read standard input.\n"
+"\n"
+"Report bugs to <" PACKAGE_BUGREPORT "> (in English or Finnish).\n"
+PACKAGE_NAME " home page: <" PACKAGE_URL ">\n", progname);
+
+	tuklib_exit(EXIT_SUCCESS, EXIT_FAILURE, display_errors);
+}
+
+
+static void lzma_attribute((__noreturn__))
+version(void)
+{
+	printf(TOOL_FORMAT "dec (" PACKAGE_NAME ") " LZMA_VERSION_STRING "\n"
+			"liblzma %s\n", lzma_version_string());
+
+	tuklib_exit(EXIT_SUCCESS, EXIT_FAILURE, display_errors);
+}
+
+
+/// Parses command line options.
+static void
+parse_options(int argc, char **argv)
+{
+	static const char short_opts[] = "cdkM:hqQV";
+	static const struct option long_opts[] = {
+		{ "stdout",       no_argument,         NULL, 'c' },
+		{ "to-stdout",    no_argument,         NULL, 'c' },
+		{ "decompress",   no_argument,         NULL, 'd' },
+		{ "uncompress",   no_argument,         NULL, 'd' },
+		{ "keep",         no_argument,         NULL, 'k' },
+		{ "quiet",        no_argument,         NULL, 'q' },
+		{ "no-warn",      no_argument,         NULL, 'Q' },
+		{ "help",         no_argument,         NULL, 'h' },
+		{ "version",      no_argument,         NULL, 'V' },
+		{ NULL,           0,                   NULL, 0   }
+	};
+
+	int c;
+
+	while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL))
+			!= -1) {
+		switch (c) {
+		case 'c':
+		case 'd':
+		case 'k':
+		case 'Q':
+			break;
+
+		case 'q':
+			if (display_errors > 0)
+				--display_errors;
+
+			break;
+
+		case 'h':
+			help();
+
+		case 'V':
+			version();
+
+		default:
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	return;
+}
+
+
+static void
+uncompress(lzma_stream *strm, FILE *file, const char *filename)
+{
+	lzma_ret ret;
+
+	// Initialize the decoder
+#ifdef LZMADEC
+	ret = lzma_alone_decoder(strm, UINT64_MAX);
+#else
+	ret = lzma_stream_decoder(strm, UINT64_MAX, LZMA_CONCATENATED);
+#endif
+
+	// The only reasonable error here is LZMA_MEM_ERROR.
+	if (ret != LZMA_OK) {
+		my_errorf("%s", ret == LZMA_MEM_ERROR ? strerror(ENOMEM)
+				: "Internal error (bug)");
+		exit(EXIT_FAILURE);
+	}
+
+	// Input and output buffers
+	uint8_t in_buf[BUFSIZ];
+	uint8_t out_buf[BUFSIZ];
+
+	strm->avail_in = 0;
+	strm->next_out = out_buf;
+	strm->avail_out = BUFSIZ;
+
+	lzma_action action = LZMA_RUN;
+
+	while (true) {
+		if (strm->avail_in == 0) {
+			strm->next_in = in_buf;
+			strm->avail_in = fread(in_buf, 1, BUFSIZ, file);
+
+			if (ferror(file)) {
+				// POSIX says that fread() sets errno if
+				// an error occurred. ferror() doesn't
+				// touch errno.
+				my_errorf("%s: Error reading input file: %s",
+						filename, strerror(errno));
+				exit(EXIT_FAILURE);
+			}
+
+#ifndef LZMADEC
+			// When using LZMA_CONCATENATED, we need to tell
+			// liblzma when it has got all the input.
+			if (feof(file))
+				action = LZMA_FINISH;
+#endif
+		}
+
+		ret = lzma_code(strm, action);
+
+		// Write and check write error before checking decoder error.
+		// This way as much data as possible gets written to output
+		// even if decoder detected an error.
+		if (strm->avail_out == 0 || ret != LZMA_OK) {
+			const size_t write_size = BUFSIZ - strm->avail_out;
+
+			if (fwrite(out_buf, 1, write_size, stdout)
+					!= write_size) {
+				// Wouldn't be a surprise if writing to stderr
+				// would fail too but at least try to show an
+				// error message.
+				my_errorf("Cannot write to standard output: "
+						"%s", strerror(errno));
+				exit(EXIT_FAILURE);
+			}
+
+			strm->next_out = out_buf;
+			strm->avail_out = BUFSIZ;
+		}
+
+		if (ret != LZMA_OK) {
+			if (ret == LZMA_STREAM_END) {
+#ifdef LZMADEC
+				// Check that there's no trailing garbage.
+				if (strm->avail_in != 0
+						|| fread(in_buf, 1, 1, file)
+							!= 0
+						|| !feof(file))
+					ret = LZMA_DATA_ERROR;
+				else
+					return;
+#else
+				// lzma_stream_decoder() already guarantees
+				// that there's no trailing garbage.
+				assert(strm->avail_in == 0);
+				assert(action == LZMA_FINISH);
+				assert(feof(file));
+				return;
+#endif
+			}
+
+			const char *msg;
+			switch (ret) {
+			case LZMA_MEM_ERROR:
+				msg = strerror(ENOMEM);
+				break;
+
+			case LZMA_FORMAT_ERROR:
+				msg = "File format not recognized";
+				break;
+
+			case LZMA_OPTIONS_ERROR:
+				// FIXME: Better message?
+				msg = "Unsupported compression options";
+				break;
+
+			case LZMA_DATA_ERROR:
+				msg = "File is corrupt";
+				break;
+
+			case LZMA_BUF_ERROR:
+				msg = "Unexpected end of input";
+				break;
+
+			default:
+				msg = "Internal error (bug)";
+				break;
+			}
+
+			my_errorf("%s: %s", filename, msg);
+			exit(EXIT_FAILURE);
+		}
+	}
+}
+
+
+int
+main(int argc, char **argv)
+{
+	// Initialize progname which we will be used in error messages.
+	tuklib_progname_init(argv);
+
+	// Parse the command line options.
+	parse_options(argc, argv);
+
+	// The same lzma_stream is used for all files that we decode. This way
+	// we don't need to reallocate memory for every file if they use same
+	// compression settings.
+	lzma_stream strm = LZMA_STREAM_INIT;
+
+	// Some systems require setting stdin and stdout to binary mode.
+#ifdef TUKLIB_DOSLIKE
+	setmode(fileno(stdin), O_BINARY);
+	setmode(fileno(stdout), O_BINARY);
+#endif
+
+	if (optind == argc) {
+		// No filenames given, decode from stdin.
+		uncompress(&strm, stdin, "(stdin)");
+	} else {
+		// Loop through the filenames given on the command line.
+		do {
+			// "-" indicates stdin.
+			if (strcmp(argv[optind], "-") == 0) {
+				uncompress(&strm, stdin, "(stdin)");
+			} else {
+				FILE *file = fopen(argv[optind], "rb");
+				if (file == NULL) {
+					my_errorf("%s: %s", argv[optind],
+							strerror(errno));
+					exit(EXIT_FAILURE);
+				}
+
+				uncompress(&strm, file, argv[optind]);
+				fclose(file);
+			}
+		} while (++optind < argc);
+	}
+
+#ifndef NDEBUG
+	// Free the memory only when debugging. Freeing wastes some time,
+	// but allows detecting possible memory leaks with Valgrind.
+	lzma_end(&strm);
+#endif
+
+	tuklib_exit(EXIT_SUCCESS, EXIT_FAILURE, display_errors);
+}
diff --git a/src/xzdec/xzdec_w32res.rc b/src/xzdec/xzdec_w32res.rc
new file mode 100644
index 0000000..0e26a22
--- /dev/null
+++ b/src/xzdec/xzdec_w32res.rc
@@ -0,0 +1,12 @@
+/*
+ * Author: Lasse Collin
+ *
+ * This file has been put into the public domain.
+ * You can do whatever you want with this file.
+ */
+
+#define MY_TYPE VFT_APP
+#define MY_NAME "xzdec"
+#define MY_SUFFIX ".exe"
+#define MY_DESC "xzdec decompression tool for .xz files"
+#include "common_w32res.rc"