Adding upstream version 0.4.upstream/0.4

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

43 files changed, 4518 insertions, 0 deletions

diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..a8fcb34
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1 @@
+Tarlz was written by Antonio Diaz Diaz.
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..4ad17ae
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,338 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
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+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+Activities other than copying, distribution and modification are not
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+  1. You may copy and distribute verbatim copies of the Program's
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+You may charge a fee for the physical act of transferring a copy, and
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+  2. You may modify your copy or copies of the Program or any portion
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+These requirements apply to the modified work as a whole.  If
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+either of that version or of any later version published by the Free
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+Foundation.
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+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
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+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
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+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
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+
+    Gnomovision version 69, Copyright (C) <year>  <name of author>
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/ChangeLog b/ChangeLog
new file mode 100644
index 0000000..a54be98
--- /dev/null
+++ b/ChangeLog
@@ -0,0 +1,37 @@
+2018-04-23  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 0.4 released.
+	* Added some missing #includes.
+	* main.cc: Open files in binary mode on OS2.
+
+2018-03-19  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 0.3 released.
+	* Project renamed to 'tarlz' from 'pmtar' (Poor Man's Tar).
+	* Added new option '-C, --directory'.
+	* Implemented lzip compression of members at archive creation.
+	* Added new option '-r, --append'.
+	* Added new options '--owner', '--group'.
+	* Added new options '--asolid', '--dsolid', '--solid'.
+	* Implemented file appending to compressed archive.
+	* Implemented transparent decompression of the archive.
+	* Implemented skipping over damaged (un)compressed members.
+	* Implemented recursive extraction/listing of directories.
+	* Implemented verbose extract/list output.
+	* tarlz.texi: New file.
+
+2014-01-22  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 0.2 released.
+	* configure: Options now accept a separate argument.
+
+2013-02-16  Antonio Diaz Diaz  <ant_diaz@teleline.es>
+
+	* Version 0.1 released.
+
+
+Copyright (C) 2013-2018 Antonio Diaz Diaz.
+
+This file is a collection of facts, and thus it is not copyrightable,
+but just in case, you have unlimited permission to copy, distribute and
+modify it.
diff --git a/INSTALL b/INSTALL
new file mode 100644
index 0000000..c05e8a8
--- /dev/null
+++ b/INSTALL
@@ -0,0 +1,65 @@
+Requirements
+------------
+You will need a C++ compiler and the lzlib compression library installed.
+I use gcc 5.3.0 and 4.1.2, but the code should compile with any
+standards compliant compiler.
+Gcc is available at http://gcc.gnu.org.
+Lzlib is available at http://www.nongnu.org/lzip/lzlib.html.
+
+
+Procedure
+---------
+1. Unpack the archive if you have not done so already:
+
+	tar -xf tarlz[version].tar.lz
+or
+	lzip -cd tarlz[version].tar.lz | tar -xf -
+
+This creates the directory ./tarlz[version] containing the source from
+the main archive.
+
+2. Change to tarlz directory and run configure.
+   (Try 'configure --help' for usage instructions).
+
+	cd tarlz[version]
+	./configure
+
+3. Run make.
+
+	make
+
+4. Optionally, type 'make check' to run the tests that come with tarlz.
+
+5. Type 'make install' to install the program and any data files and
+   documentation.
+
+   Or type 'make install-compress', which additionally compresses the
+   info manual and the man page after installation. (Installing
+   compressed docs may become the default in the future).
+
+   You can install only the program, the info manual or the man page by
+   typing 'make install-bin', 'make install-info' or 'make install-man'
+   respectively.
+
+
+Another way
+-----------
+You can also compile tarlz into a separate directory.
+To do this, you must use a version of 'make' that supports the 'VPATH'
+variable, such as GNU 'make'. 'cd' to the directory where you want the
+object files and executables to go and run the 'configure' script.
+'configure' automatically checks for the source code in '.', in '..' and
+in the directory that 'configure' is in.
+
+'configure' recognizes the option '--srcdir=DIR' to control where to
+look for the sources. Usually 'configure' can determine that directory
+automatically.
+
+After running 'configure', you can run 'make' and 'make install' as
+explained above.
+
+
+Copyright (C) 2013-2018 Antonio Diaz Diaz.
+
+This file is free documentation: you have unlimited permission to copy,
+distribute and modify it.
diff --git a/Makefile.in b/Makefile.in
new file mode 100644
index 0000000..1b94c12
--- /dev/null
+++ b/Makefile.in
@@ -0,0 +1,137 @@
+
+DISTNAME = $(pkgname)-$(pkgversion)
+INSTALL = install
+INSTALL_PROGRAM = $(INSTALL) -m 755
+INSTALL_DATA = $(INSTALL) -m 644
+INSTALL_DIR = $(INSTALL) -d -m 755
+LIBS = -llz
+SHELL = /bin/sh
+CAN_RUN_INSTALLINFO = $(SHELL) -c "install-info --version" > /dev/null 2>&1
+
+objs = arg_parser.o create.o extract.o main.o
+
+
+.PHONY : all install install-bin install-info install-man \
+         install-strip install-compress install-strip-compress \
+         install-bin-strip install-info-compress install-man-compress \
+         uninstall uninstall-bin uninstall-info uninstall-man \
+         doc info man check dist clean distclean
+
+all : $(progname)
+
+$(progname) : $(objs)
+	$(CXX) $(LDFLAGS) $(CXXFLAGS) -o $@ $(objs) $(LIBS)
+
+main.o : main.cc
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -DPROGVERSION=\"$(pkgversion)\" -c -o $@ $<
+
+%.o : %.cc
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
+
+$(objs)      : Makefile
+arg_parser.o : arg_parser.h
+create.o     : arg_parser.h lzip.h tarlz.h
+extract.o    : arg_parser.h lzip.h tarlz.h
+main.o       : arg_parser.h tarlz.h
+
+
+doc : info man
+
+info : $(VPATH)/doc/$(pkgname).info
+
+$(VPATH)/doc/$(pkgname).info : $(VPATH)/doc/$(pkgname).texi
+	cd $(VPATH)/doc && makeinfo $(pkgname).texi
+
+man : $(VPATH)/doc/$(progname).1
+
+$(VPATH)/doc/$(progname).1 : $(progname)
+	help2man -n 'creates tar archives with multimember lzip compression' \
+	  -o $@ ./$(progname)
+
+Makefile : $(VPATH)/configure $(VPATH)/Makefile.in
+	./config.status
+
+check : all
+	@$(VPATH)/testsuite/check.sh $(VPATH)/testsuite $(pkgversion)
+
+install : install-bin install-info install-man
+install-strip : install-bin-strip install-info install-man
+install-compress : install-bin install-info-compress install-man-compress
+install-strip-compress : install-bin-strip install-info-compress install-man-compress
+
+install-bin : all
+	if [ ! -d "$(DESTDIR)$(bindir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(bindir)" ; fi
+	$(INSTALL_PROGRAM) ./$(progname) "$(DESTDIR)$(bindir)/$(progname)"
+
+install-bin-strip : all
+	$(MAKE) INSTALL_PROGRAM='$(INSTALL_PROGRAM) -s' install-bin
+
+install-info :
+	if [ ! -d "$(DESTDIR)$(infodir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(infodir)" ; fi
+	-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"*
+	$(INSTALL_DATA) $(VPATH)/doc/$(pkgname).info "$(DESTDIR)$(infodir)/$(pkgname).info"
+	-if $(CAN_RUN_INSTALLINFO) ; then \
+		install-info --info-dir="$(DESTDIR)$(infodir)" "$(DESTDIR)$(infodir)/$(pkgname).info" ; \
+	fi
+
+install-info-compress : install-info
+	lzip -v -9 "$(DESTDIR)$(infodir)/$(pkgname).info"
+
+install-man :
+	if [ ! -d "$(DESTDIR)$(mandir)/man1" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(mandir)/man1" ; fi
+	-rm -f "$(DESTDIR)$(mandir)/man1/$(progname).1"*
+	$(INSTALL_DATA) $(VPATH)/doc/$(progname).1 "$(DESTDIR)$(mandir)/man1/$(progname).1"
+
+install-man-compress : install-man
+	lzip -v -9 "$(DESTDIR)$(mandir)/man1/$(progname).1"
+
+uninstall : uninstall-man uninstall-info uninstall-bin
+
+uninstall-bin :
+	-rm -f "$(DESTDIR)$(bindir)/$(progname)"
+
+uninstall-info :
+	-if $(CAN_RUN_INSTALLINFO) ; then \
+		install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$(pkgname).info" ; \
+	fi
+	-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"*
+
+uninstall-man :
+	-rm -f "$(DESTDIR)$(mandir)/man1/$(progname).1"*
+
+dist : doc
+	ln -sf $(VPATH) $(DISTNAME)
+	tar -Hustar --owner=root --group=root -cvf $(DISTNAME).tar \
+	  $(DISTNAME)/AUTHORS \
+	  $(DISTNAME)/COPYING \
+	  $(DISTNAME)/ChangeLog \
+	  $(DISTNAME)/INSTALL \
+	  $(DISTNAME)/Makefile.in \
+	  $(DISTNAME)/NEWS \
+	  $(DISTNAME)/README \
+	  $(DISTNAME)/configure \
+	  $(DISTNAME)/doc/$(progname).1 \
+	  $(DISTNAME)/doc/$(pkgname).info \
+	  $(DISTNAME)/doc/$(pkgname).texi \
+	  $(DISTNAME)/*.h \
+	  $(DISTNAME)/*.cc \
+	  $(DISTNAME)/testsuite/check.sh \
+	  $(DISTNAME)/testsuite/test.txt \
+	  $(DISTNAME)/testsuite/test.txt.tar \
+	  $(DISTNAME)/testsuite/test3.tar \
+	  $(DISTNAME)/testsuite/test3_bad[1-5].tar \
+	  $(DISTNAME)/testsuite/test.txt.lz \
+	  $(DISTNAME)/testsuite/test.txt.tar.lz \
+	  $(DISTNAME)/testsuite/test3.tar.lz \
+	  $(DISTNAME)/testsuite/test3a.tar.lz \
+	  $(DISTNAME)/testsuite/test3_bad[1-6].tar.lz \
+	  $(DISTNAME)/testsuite/dotdot[1-5].tar.lz \
+	  $(DISTNAME)/testsuite/eof.tar.lz
+	rm -f $(DISTNAME)
+	lzip -v -9 $(DISTNAME).tar
+
+clean :
+	-rm -f $(progname) $(objs)
+
+distclean : clean
+	-rm -f Makefile config.status *.tar *.tar.lz
diff --git a/NEWS b/NEWS
new file mode 100644
index 0000000..815ed45
--- /dev/null
+++ b/NEWS
@@ -0,0 +1,5 @@
+Changes in version 0.4:
+
+Some missing #includes have been fixed.
+
+Open files in binary mode on OS2.
diff --git a/README b/README
new file mode 100644
index 0000000..bafec18
--- /dev/null
+++ b/README
@@ -0,0 +1,62 @@
+Description
+
+Tarlz is a small and simple implementation of the tar archiver. By
+default tarlz creates, lists and extracts archives in the 'ustar' format
+compressed with lzip on a per file basis. Tarlz can append files to the
+end of such compressed archives.
+
+Each tar member is compressed in its own lzip member, as well as the
+end-of-file blocks. This same method works for any tar format (gnu,
+ustar, posix) and is fully backward compatible with standard tar tools
+like GNU tar, which treat the resulting multimember tar.lz archive like
+any other tar.lz archive.
+
+Tarlz can create tar archives with four levels of compression
+granularity; per file, per directory, appendable solid, and solid.
+
+Tarlz is intended as a showcase project for the maintainers of real tar
+programs to evaluate the format and perhaps implement it in their tools.
+
+The diagram below shows the correspondence between tar members (formed
+by a header plus optional data) in the tar archive and lzip members in
+the resulting multimember tar.lz archive:
+
+tar
++========+======+========+======+========+======+========+
+| header | data | header | data | header | data |   eof  |
++========+======+========+======+========+======+========+
+
+tar.lz
++===============+===============+===============+========+
+|     member    |     member    |     member    | member |
++===============+===============+===============+========+
+
+Of course, compressing each file (or each directory) individually is
+less efficient than compressing the whole tar archive, but it has the
+following advantages:
+
+   * The resulting multimember tar.lz archive can be decompressed in
+     parallel with plzip, multiplying the decompression speed.
+
+   * New members can be appended to the archive (by removing the eof
+     member) just like to an uncompressed tar archive.
+
+   * It is a safe posix-style backup format. In case of corruption,
+     tarlz can extract all the undamaged members from the tar.lz
+     archive, skipping over the damaged members, just like the standard
+     (uncompressed) tar. Moreover, lziprecover can be used to recover at
+     least part of the contents of the damaged members.
+
+   * A multimember tar.lz archive is usually smaller than the
+     corresponding solidly compressed tar.gz archive, except when
+     individually compressing files smaller than about 32 KiB.
+
+
+Copyright (C) 2013-2018 Antonio Diaz Diaz.
+
+This file is free documentation: you have unlimited permission to copy,
+distribute and modify it.
+
+The file Makefile.in is a data file used by configure to produce the
+Makefile. It has the same copyright owner and permissions that configure
+itself.
diff --git a/arg_parser.cc b/arg_parser.cc
new file mode 100644
index 0000000..008ebc8
--- /dev/null
+++ b/arg_parser.cc
@@ -0,0 +1,196 @@
+/*  Arg_parser - POSIX/GNU command line argument parser. (C++ version)
+    Copyright (C) 2006-2018 Antonio Diaz Diaz.
+
+    This library is free software. Redistribution and use in source and
+    binary forms, with or without modification, are permitted provided
+    that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+*/
+
+#include <cstring>
+#include <string>
+#include <vector>
+
+#include "arg_parser.h"
+
+
+bool Arg_parser::parse_long_option( const char * const opt, const char * const arg,
+                                    const Option options[], int & argind )
+  {
+  unsigned len;
+  int index = -1;
+  bool exact = false, ambig = false;
+
+  for( len = 0; opt[len+2] && opt[len+2] != '='; ++len ) ;
+
+  // Test all long options for either exact match or abbreviated matches.
+  for( int i = 0; options[i].code != 0; ++i )
+    if( options[i].name && std::strncmp( options[i].name, &opt[2], len ) == 0 )
+      {
+      if( std::strlen( options[i].name ) == len )	// Exact match found
+        { index = i; exact = true; break; }
+      else if( index < 0 ) index = i;		// First nonexact match found
+      else if( options[index].code != options[i].code ||
+               options[index].has_arg != options[i].has_arg )
+        ambig = true;		// Second or later nonexact match found
+      }
+
+  if( ambig && !exact )
+    {
+    error_ = "option '"; error_ += opt; error_ += "' is ambiguous";
+    return false;
+    }
+
+  if( index < 0 )		// nothing found
+    {
+    error_ = "unrecognized option '"; error_ += opt; error_ += '\'';
+    return false;
+    }
+
+  ++argind;
+  data.push_back( Record( options[index].code ) );
+
+  if( opt[len+2] )		// '--<long_option>=<argument>' syntax
+    {
+    if( options[index].has_arg == no )
+      {
+      error_ = "option '--"; error_ += options[index].name;
+      error_ += "' doesn't allow an argument";
+      return false;
+      }
+    if( options[index].has_arg == yes && !opt[len+3] )
+      {
+      error_ = "option '--"; error_ += options[index].name;
+      error_ += "' requires an argument";
+      return false;
+      }
+    data.back().argument = &opt[len+3];
+    return true;
+    }
+
+  if( options[index].has_arg == yes )
+    {
+    if( !arg || !arg[0] )
+      {
+      error_ = "option '--"; error_ += options[index].name;
+      error_ += "' requires an argument";
+      return false;
+      }
+    ++argind; data.back().argument = arg;
+    return true;
+    }
+
+  return true;
+  }
+
+
+bool Arg_parser::parse_short_option( const char * const opt, const char * const arg,
+                                     const Option options[], int & argind )
+  {
+  int cind = 1;			// character index in opt
+
+  while( cind > 0 )
+    {
+    int index = -1;
+    const unsigned char c = opt[cind];
+
+    if( c != 0 )
+      for( int i = 0; options[i].code; ++i )
+        if( c == options[i].code )
+          { index = i; break; }
+
+    if( index < 0 )
+      {
+      error_ = "invalid option -- '"; error_ += c; error_ += '\'';
+      return false;
+      }
+
+    data.push_back( Record( c ) );
+    if( opt[++cind] == 0 ) { ++argind; cind = 0; }	// opt finished
+
+    if( options[index].has_arg != no && cind > 0 && opt[cind] )
+      {
+      data.back().argument = &opt[cind]; ++argind; cind = 0;
+      }
+    else if( options[index].has_arg == yes )
+      {
+      if( !arg || !arg[0] )
+        {
+        error_ = "option requires an argument -- '"; error_ += c;
+        error_ += '\'';
+        return false;
+        }
+      data.back().argument = arg; ++argind; cind = 0;
+      }
+    }
+  return true;
+  }
+
+
+Arg_parser::Arg_parser( const int argc, const char * const argv[],
+                        const Option options[], const bool in_order )
+  {
+  if( argc < 2 || !argv || !options ) return;
+
+  std::vector< const char * > non_options;	// skipped non-options
+  int argind = 1;				// index in argv
+
+  while( argind < argc )
+    {
+    const unsigned char ch1 = argv[argind][0];
+    const unsigned char ch2 = ch1 ? argv[argind][1] : 0;
+
+    if( ch1 == '-' && ch2 )		// we found an option
+      {
+      const char * const opt = argv[argind];
+      const char * const arg = ( argind + 1 < argc ) ? argv[argind+1] : 0;
+      if( ch2 == '-' )
+        {
+        if( !argv[argind][2] ) { ++argind; break; }	// we found "--"
+        else if( !parse_long_option( opt, arg, options, argind ) ) break;
+        }
+      else if( !parse_short_option( opt, arg, options, argind ) ) break;
+      }
+    else
+      {
+      if( in_order ) data.push_back( Record( argv[argind++] ) );
+      else non_options.push_back( argv[argind++] );
+      }
+    }
+  if( error_.size() ) data.clear();
+  else
+    {
+    for( unsigned i = 0; i < non_options.size(); ++i )
+      data.push_back( Record( non_options[i] ) );
+    while( argind < argc )
+      data.push_back( Record( argv[argind++] ) );
+    }
+  }
+
+
+Arg_parser::Arg_parser( const char * const opt, const char * const arg,
+                        const Option options[] )
+  {
+  if( !opt || !opt[0] || !options ) return;
+
+  if( opt[0] == '-' && opt[1] )		// we found an option
+    {
+    int argind = 1;			// dummy
+    if( opt[1] == '-' )
+      { if( opt[2] ) parse_long_option( opt, arg, options, argind ); }
+    else
+      parse_short_option( opt, arg, options, argind );
+    if( error_.size() ) data.clear();
+    }
+  else data.push_back( Record( opt ) );
+  }
diff --git a/arg_parser.h b/arg_parser.h
new file mode 100644
index 0000000..f015881
--- /dev/null
+++ b/arg_parser.h
@@ -0,0 +1,98 @@
+/*  Arg_parser - POSIX/GNU command line argument parser. (C++ version)
+    Copyright (C) 2006-2018 Antonio Diaz Diaz.
+
+    This library is free software. Redistribution and use in source and
+    binary forms, with or without modification, are permitted provided
+    that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+*/
+
+/*  Arg_parser reads the arguments in 'argv' and creates a number of
+    option codes, option arguments and non-option arguments.
+
+    In case of error, 'error' returns a non-empty error message.
+
+    'options' is an array of 'struct Option' terminated by an element
+    containing a code which is zero. A null name means a short-only
+    option. A code value outside the unsigned char range means a
+    long-only option.
+
+    Arg_parser normally makes it appear as if all the option arguments
+    were specified before all the non-option arguments for the purposes
+    of parsing, even if the user of your program intermixed option and
+    non-option arguments. If you want the arguments in the exact order
+    the user typed them, call 'Arg_parser' with 'in_order' = true.
+
+    The argument '--' terminates all options; any following arguments are
+    treated as non-option arguments, even if they begin with a hyphen.
+
+    The syntax for optional option arguments is '-<short_option><argument>'
+    (without whitespace), or '--<long_option>=<argument>'.
+*/
+
+class Arg_parser
+  {
+public:
+  enum Has_arg { no, yes, maybe };
+
+  struct Option
+    {
+    int code;			// Short option letter or code ( code != 0 )
+    const char * name;		// Long option name (maybe null)
+    Has_arg has_arg;
+    };
+
+private:
+  struct Record
+    {
+    int code;
+    std::string argument;
+    explicit Record( const int c ) : code( c ) {}
+    explicit Record( const char * const arg ) : code( 0 ), argument( arg ) {}
+    };
+
+  std::string error_;
+  std::vector< Record > data;
+
+  bool parse_long_option( const char * const opt, const char * const arg,
+                          const Option options[], int & argind );
+  bool parse_short_option( const char * const opt, const char * const arg,
+                           const Option options[], int & argind );
+
+public:
+  Arg_parser( const int argc, const char * const argv[],
+              const Option options[], const bool in_order = false );
+
+      // Restricted constructor. Parses a single token and argument (if any)
+  Arg_parser( const char * const opt, const char * const arg,
+              const Option options[] );
+
+  const std::string & error() const { return error_; }
+
+      // The number of arguments parsed (may be different from argc)
+  int arguments() const { return data.size(); }
+
+      // If code( i ) is 0, argument( i ) is a non-option.
+      // Else argument( i ) is the option's argument (or empty).
+  int code( const int i ) const
+    {
+    if( i >= 0 && i < arguments() ) return data[i].code;
+    else return 0;
+    }
+
+  const std::string & argument( const int i ) const
+    {
+    if( i >= 0 && i < arguments() ) return data[i].argument;
+    else return error_;
+    }
+  };
diff --git a/configure b/configure
new file mode 100755
index 0000000..a8a5d34
--- /dev/null
+++ b/configure
@@ -0,0 +1,196 @@
+#! /bin/sh
+# configure script for Tarlz - Archiver with multimember lzip compression
+# Copyright (C) 2013-2018 Antonio Diaz Diaz.
+#
+# This configure script is free software: you have unlimited permission
+# to copy, distribute and modify it.
+
+pkgname=tarlz
+pkgversion=0.4
+progname=tarlz
+srctrigger=doc/${pkgname}.texi
+
+# clear some things potentially inherited from environment.
+LC_ALL=C
+export LC_ALL
+srcdir=
+prefix=/usr/local
+exec_prefix='$(prefix)'
+bindir='$(exec_prefix)/bin'
+datarootdir='$(prefix)/share'
+infodir='$(datarootdir)/info'
+mandir='$(datarootdir)/man'
+CXX=g++
+CPPFLAGS=
+CXXFLAGS='-Wall -W -O2'
+LDFLAGS=
+
+# checking whether we are using GNU C++.
+/bin/sh -c "${CXX} --version" > /dev/null 2>&1 ||
+	{
+	CXX=c++
+	CXXFLAGS=-O2
+	}
+
+# Loop over all args
+args=
+no_create=
+while [ $# != 0 ] ; do
+
+	# Get the first arg, and shuffle
+	option=$1 ; arg2=no
+	shift
+
+	# Add the argument quoted to args
+	args="${args} \"${option}\""
+
+	# Split out the argument for options that take them
+	case ${option} in
+	*=*) optarg=`echo ${option} | sed -e 's,^[^=]*=,,;s,/$,,'` ;;
+	esac
+
+	# Process the options
+	case ${option} in
+	--help | -h)
+		echo "Usage: $0 [OPTION]... [VAR=VALUE]..."
+		echo
+		echo "To assign makefile variables (e.g., CXX, CXXFLAGS...), specify them as"
+		echo "arguments to configure in the form VAR=VALUE."
+		echo
+		echo "Options and variables: [defaults in brackets]"
+		echo "  -h, --help            display this help and exit"
+		echo "  -V, --version         output version information and exit"
+		echo "  --srcdir=DIR          find the sources in DIR [. or ..]"
+		echo "  --prefix=DIR          install into DIR [${prefix}]"
+		echo "  --exec-prefix=DIR     base directory for arch-dependent files [${exec_prefix}]"
+		echo "  --bindir=DIR          user executables directory [${bindir}]"
+		echo "  --datarootdir=DIR     base directory for doc and data [${datarootdir}]"
+		echo "  --infodir=DIR         info files directory [${infodir}]"
+		echo "  --mandir=DIR          man pages directory [${mandir}]"
+		echo "  CXX=COMPILER          C++ compiler to use [${CXX}]"
+		echo "  CPPFLAGS=OPTIONS      command line options for the preprocessor [${CPPFLAGS}]"
+		echo "  CXXFLAGS=OPTIONS      command line options for the C++ compiler [${CXXFLAGS}]"
+		echo "  LDFLAGS=OPTIONS       command line options for the linker [${LDFLAGS}]"
+		echo
+		exit 0 ;;
+	--version | -V)
+		echo "Configure script for ${pkgname} version ${pkgversion}"
+		exit 0 ;;
+	--srcdir)            srcdir=$1 ; arg2=yes ;;
+	--prefix)            prefix=$1 ; arg2=yes ;;
+	--exec-prefix)  exec_prefix=$1 ; arg2=yes ;;
+	--bindir)            bindir=$1 ; arg2=yes ;;
+	--datarootdir)  datarootdir=$1 ; arg2=yes ;;
+	--infodir)          infodir=$1 ; arg2=yes ;;
+	--mandir)            mandir=$1 ; arg2=yes ;;
+
+	--srcdir=*)            srcdir=${optarg} ;;
+	--prefix=*)            prefix=${optarg} ;;
+	--exec-prefix=*)  exec_prefix=${optarg} ;;
+	--bindir=*)            bindir=${optarg} ;;
+	--datarootdir=*)  datarootdir=${optarg} ;;
+	--infodir=*)          infodir=${optarg} ;;
+	--mandir=*)            mandir=${optarg} ;;
+	--no-create)              no_create=yes ;;
+
+	CXX=*)           CXX=${optarg} ;;
+	CPPFLAGS=*) CPPFLAGS=${optarg} ;;
+	CXXFLAGS=*) CXXFLAGS=${optarg} ;;
+	LDFLAGS=*)   LDFLAGS=${optarg} ;;
+
+	--*)
+		echo "configure: WARNING: unrecognized option: '${option}'" 1>&2 ;;
+	*=* | *-*-*) ;;
+	*)
+		echo "configure: unrecognized option: '${option}'" 1>&2
+		echo "Try 'configure --help' for more information." 1>&2
+		exit 1 ;;
+	esac
+
+	# Check if the option took a separate argument
+	if [ "${arg2}" = yes ] ; then
+		if [ $# != 0 ] ; then args="${args} \"$1\"" ; shift
+		else echo "configure: Missing argument to '${option}'" 1>&2
+			exit 1
+		fi
+	fi
+done
+
+# Find the source files, if location was not specified.
+srcdirtext=
+if [ -z "${srcdir}" ] ; then
+	srcdirtext="or . or .." ; srcdir=.
+	if [ ! -r "${srcdir}/${srctrigger}" ] ; then srcdir=.. ; fi
+	if [ ! -r "${srcdir}/${srctrigger}" ] ; then
+		## the sed command below emulates the dirname command
+		srcdir=`echo $0 | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
+	fi
+fi
+
+if [ ! -r "${srcdir}/${srctrigger}" ] ; then
+	echo "configure: Can't find sources in ${srcdir} ${srcdirtext}" 1>&2
+	echo "configure: (At least ${srctrigger} is missing)." 1>&2
+	exit 1
+fi
+
+# Set srcdir to . if that's what it is.
+if [ "`pwd`" = "`cd "${srcdir}" ; pwd`" ] ; then srcdir=. ; fi
+
+echo
+if [ -z "${no_create}" ] ; then
+	echo "creating config.status"
+	rm -f config.status
+	cat > config.status << EOF
+#! /bin/sh
+# This file was generated automatically by configure. Don't edit.
+# Run this file to recreate the current configuration.
+#
+# This script is free software: you have unlimited permission
+# to copy, distribute and modify it.
+
+exec /bin/sh $0 ${args} --no-create
+EOF
+	chmod +x config.status
+fi
+
+echo "creating Makefile"
+echo "VPATH = ${srcdir}"
+echo "prefix = ${prefix}"
+echo "exec_prefix = ${exec_prefix}"
+echo "bindir = ${bindir}"
+echo "datarootdir = ${datarootdir}"
+echo "infodir = ${infodir}"
+echo "mandir = ${mandir}"
+echo "CXX = ${CXX}"
+echo "CPPFLAGS = ${CPPFLAGS}"
+echo "CXXFLAGS = ${CXXFLAGS}"
+echo "LDFLAGS = ${LDFLAGS}"
+rm -f Makefile
+cat > Makefile << EOF
+# Makefile for Tarlz - Archiver with multimember lzip compression
+# Copyright (C) 2013-2018 Antonio Diaz Diaz.
+# This file was generated automatically by configure. Don't edit.
+#
+# This Makefile is free software: you have unlimited permission
+# to copy, distribute and modify it.
+
+pkgname = ${pkgname}
+pkgversion = ${pkgversion}
+progname = ${progname}
+VPATH = ${srcdir}
+prefix = ${prefix}
+exec_prefix = ${exec_prefix}
+bindir = ${bindir}
+datarootdir = ${datarootdir}
+infodir = ${infodir}
+mandir = ${mandir}
+CXX = ${CXX}
+CPPFLAGS = ${CPPFLAGS}
+CXXFLAGS = ${CXXFLAGS}
+LDFLAGS = ${LDFLAGS}
+EOF
+cat "${srcdir}/Makefile.in" >> Makefile
+
+echo "OK. Now you can run make."
+echo "If make fails, verify that the lzlib compression library is correctly"
+echo "installed (see INSTALL)."
diff --git a/create.cc b/create.cc
new file mode 100644
index 0000000..c5bed25
--- /dev/null
+++ b/create.cc
@@ -0,0 +1,412 @@
+/*  Tarlz - Archiver with multimember lzip compression
+    Copyright (C) 2013-2018 Antonio Diaz Diaz.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <algorithm>
+#include <cerrno>
+#include <climits>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <stdint.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <ftw.h>
+#include <grp.h>
+#include <pwd.h>
+#include <lzlib.h>
+
+#include "arg_parser.h"
+#include "lzip.h"
+#include "tarlz.h"
+
+int cl_owner = -1;		// global vars needed by add_member
+int cl_group = -1;
+int cl_solid = 0;		// 1 = dsolid, 2 = asolid, 3 = solid
+
+namespace {
+
+LZ_Encoder * encoder = 0;	// local vars needed by add_member
+int outfd = -1;
+int gretval = 0;
+
+int seek_read( const int fd, uint8_t * const buf, const int size,
+               const long long pos )
+  {
+  if( lseek( fd, pos, SEEK_SET ) == pos )
+    return readblock( fd, buf, size );
+  return 0;
+  }
+
+// Check archive type, remove EOF blocks, and leave outfd file pos at EOF
+bool check_appendable()
+  {
+  struct stat st;
+  if( fstat( outfd, &st ) != 0 || !S_ISREG( st.st_mode ) ) return false;
+  uint8_t buf[header_size];
+  int rd = readblock( outfd, buf, header_size );
+  if( rd == 0 && errno == 0 ) return true;	// append to empty archive
+  if( rd < min_member_size || ( rd != header_size && errno ) ) return false;
+  const Lzip_header * const p = (Lzip_header *)buf;	// shut up gcc
+  if( !p->verify_magic() ) return false;
+  LZ_Decoder * decoder = LZ_decompress_open();	// decompress first header
+  if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok ||
+      LZ_decompress_write( decoder, buf, rd ) != rd ||
+      ( rd = LZ_decompress_read( decoder, buf, header_size ) ) <
+      magic_o + magic_l )
+    { LZ_decompress_close( decoder ); return false; }
+  LZ_decompress_close( decoder );
+  const bool maybe_eof = ( buf[0] == 0 );
+  if( !verify_ustar_chksum( buf ) && !maybe_eof ) return false;
+  const long long end = lseek( outfd, 0, SEEK_END );
+  if( end < min_member_size ) return false;
+
+  Lzip_trailer trailer;
+  if( seek_read( outfd, trailer.data, Lzip_trailer::size,
+                 end - Lzip_trailer::size ) != Lzip_trailer::size )
+    return false;
+  const long long member_size = trailer.member_size();
+  if( member_size < min_member_size || member_size > end ||
+      ( maybe_eof && member_size != end ) ) return false;
+
+  Lzip_header header;
+  if( seek_read( outfd, header.data, Lzip_header::size,
+                 end - member_size ) != Lzip_header::size )
+    return false;
+  if( !header.verify_magic() || !isvalid_ds( header.dictionary_size() ) )
+    return false;
+
+  const unsigned long long data_size = trailer.data_size();
+  if( data_size < header_size || data_size > 32256 ) return false;
+  const unsigned data_crc = trailer.data_crc();
+  const CRC32 crc32;
+  uint32_t crc = 0xFFFFFFFFU;
+  for( unsigned i = 0; i < data_size; ++i ) crc32.update_byte( crc, 0 );
+  crc ^= 0xFFFFFFFFU;
+  if( crc != data_crc ) return false;
+
+  if( lseek( outfd, end - member_size, SEEK_SET ) != end - member_size ||
+      ftruncate( outfd, end - member_size ) != 0 ) return false;
+  return true;
+  }
+
+
+bool archive_write( const uint8_t * const buf, const int size )
+  {
+  if( !encoder )					// uncompressed
+    return ( writeblock( outfd, buf, size ) == size );
+  enum { obuf_size = 65536 };
+  uint8_t obuf[obuf_size];
+  int sz = 0;
+  if( size <= 0 ) LZ_compress_finish( encoder );	// flush encoder
+  while( sz < size || size <= 0 )
+    {
+    const int wr = LZ_compress_write( encoder, buf + sz, size - sz );
+    if( wr < 0 ) internal_error( "library error (LZ_compress_write)." );
+    sz += wr;
+    const int rd = LZ_compress_read( encoder, obuf, obuf_size );
+    if( rd < 0 ) internal_error( "library error (LZ_compress_read)." );
+    if( rd == 0 && sz == size ) break;
+    if( writeblock( outfd, obuf, rd ) != rd ) return false;
+    }
+  if( LZ_compress_finished( encoder ) == 1 &&
+      LZ_compress_restart_member( encoder, LLONG_MAX ) < 0 )
+    internal_error( "library error (LZ_compress_restart_member)." );
+  return true;
+  }
+
+
+void print_octal( char * const buf, int size, unsigned long long num )
+  {
+  while( --size >= 0 ) { buf[size] = '0' + ( num % 8 ); num /= 8; }
+  }
+
+
+const char * remove_leading_dotdot( const char * const filename )
+  {
+  static std::string prefix;
+  const char * p = filename;
+
+  for( int i = 0; filename[i]; ++i )
+    if( filename[i] == '.' && filename[i+1] == '.' &&
+        ( i == 0 || filename[i-1] == '/' ) &&
+        ( filename[i+2] == 0 || filename[i+2] == '/' ) ) p = filename + i + 2;
+  while( *p == '/' || ( *p == '.' && p[1] == '/' ) ) ++p;
+  if( p != filename )
+    {
+    std::string msg( filename, p - filename );
+    if( prefix != msg )
+      {
+      prefix = msg;
+      msg = "Removing leading '"; msg += prefix; msg += "' from member names.";
+      show_error( msg.c_str() );
+      }
+    }
+  if( *p == 0 ) p = ".";
+  return p;
+  }
+
+
+bool split_name( const char * const filename, Tar_header header )
+  {
+  const char * const stored_name = remove_leading_dotdot( filename );
+  const int len = std::strlen( stored_name );
+  enum { max_len = prefix_l + 1 + name_l };	// prefix + '/' + name
+  if( len <= name_l )				// stored_name fits in name
+    { std::memcpy( header + name_o, stored_name, len ); return true; }
+  if( len <= max_len )				// find shortest prefix
+    for( int i = len - name_l - 1; i < len && i <= prefix_l; ++i )
+      if( stored_name[i] == '/' )
+        {
+        std::memcpy( header + name_o, stored_name + i + 1, len - i - 1 );
+        std::memcpy( header + prefix_o, stored_name, i );
+        return true;
+        }
+  return false;
+  }
+
+int add_member( const char * const filename, const struct stat *,
+                const int flag, struct FTW * )
+  {
+  struct stat st;
+  if( lstat( filename, &st ) != 0 )
+    { show_file_error( filename, "Can't stat input file", errno );
+      gretval = 1; return 0; }
+  Tar_header header;
+  std::memset( header, 0, header_size );
+  if( !split_name( filename, header ) )
+    { show_file_error( filename, "File name is too long." );
+      gretval = 2; return 0; }
+
+  const mode_t mode = st.st_mode;
+  print_octal( header + mode_o, mode_l - 1,
+               mode & ( S_ISUID | S_ISGID | S_ISVTX |
+                        S_IRWXU | S_IRWXG | S_IRWXO ) );
+  const uid_t uid = ( cl_owner >= 0 ) ? (uid_t)cl_owner : st.st_uid;
+  const gid_t gid = ( cl_group >= 0 ) ? (gid_t)cl_group : st.st_gid;
+  print_octal( header + uid_o, uid_l - 1, uid );
+  print_octal( header + gid_o, gid_l - 1, gid );
+  unsigned long long file_size = 0;
+  print_octal( header + mtime_o, mtime_l - 1, st.st_mtime );
+  Typeflag typeflag;
+  if( S_ISREG( mode ) ) { typeflag = tf_regular; file_size = st.st_size; }
+  else if( S_ISDIR( mode ) )
+    {
+    typeflag = tf_directory;
+    if( flag == FTW_DNR )
+      { show_file_error( filename, "Can't open directory", errno );
+        gretval = 1; return 0; }
+    }
+  else if( S_ISLNK( mode ) )
+    {
+    typeflag = tf_symlink;
+    if( st.st_size > linkname_l ||
+        readlink( filename, header + linkname_o, linkname_l ) != st.st_size )
+      {
+      show_file_error( filename, "Link destination name is too long." );
+      gretval = 2; return 0;
+      }
+    }
+  else if( S_ISCHR( mode ) || S_ISBLK( mode ) )
+    {
+    typeflag = S_ISCHR( mode ) ? tf_chardev : tf_blockdev;
+    print_octal( header + devmajor_o, devmajor_l - 1, major( st.st_dev ) );
+    print_octal( header + devminor_o, devminor_l - 1, minor( st.st_dev ) );
+    }
+  else if( S_ISFIFO( mode ) ) typeflag = tf_fifo;
+  else { show_file_error( filename, "Unknown file type." );
+         gretval = 2; return 0; }
+  header[typeflag_o] = typeflag;
+  std::memcpy( header + magic_o, ustar_magic, magic_l - 1 );
+  header[version_o] = header[version_o+1] = '0';
+  const struct passwd * const pw = getpwuid( uid );
+  if( pw && pw->pw_name )
+    std::strncpy( header + uname_o, pw->pw_name, uname_l - 1 );
+  const struct group * const gr = getgrgid( gid );
+  if( gr && gr->gr_name )
+    std::strncpy( header + gname_o, gr->gr_name, gname_l - 1 );
+  print_octal( header + size_o, size_l - 1, file_size );
+  print_octal( header + chksum_o, chksum_l - 1,
+               ustar_chksum( (const uint8_t *)header ) );
+
+  const int infd = file_size ? open_instream( filename ) : -1;
+  if( file_size && infd < 0 ) { gretval = 1; return 0; }
+  if( !archive_write( (const uint8_t *)header, header_size ) )
+    { show_error( "Error writing archive header", errno ); return 1; }
+  if( file_size )
+    {
+    enum { bufsize = 32 * header_size };
+    uint8_t buf[bufsize];
+    unsigned long long rest = file_size;
+    while( rest > 0 )
+      {
+      int size = std::min( rest, (unsigned long long)bufsize );
+      const int rd = readblock( infd, buf, size );
+      rest -= rd;
+      if( rd != size )
+        {
+        if( verbosity >= 0 )
+          std::fprintf( stderr, "File '%s' ends unexpectedly at pos %llu\n",
+                        filename, file_size - rest );
+        close( infd ); return 1;
+        }
+      if( rest == 0 )				// last read
+        {
+        const int rem = file_size % header_size;
+        if( rem > 0 )
+          { const int padding = header_size - rem;
+            std::memset( buf + size, 0, padding ); size += padding; }
+        }
+      if( !archive_write( buf, size ) )
+        { show_error( "Error writing archive", errno ); close( infd );
+          return 1; }
+      }
+    if( close( infd ) != 0 )
+      { show_file_error( filename, "Error closing file", errno ); return 1; }
+    }
+  if( encoder && cl_solid == 0 && !archive_write( 0, 0 ) )	// flush encoder
+    { show_error( "Error flushing encoder", errno ); return 1; }
+  if( verbosity >= 1 ) std::fprintf( stderr, "%s\n", filename );
+  return 0;
+  }
+
+} // end namespace
+
+
+unsigned ustar_chksum( const uint8_t * const buf )
+  {
+  unsigned chksum = chksum_l * 0x20;	// treat chksum field as spaces
+  for( int i = 0; i < chksum_o; ++i ) chksum += buf[i];
+  for( int i = chksum_o + chksum_l; i < header_size; ++i ) chksum += buf[i];
+  return chksum;
+  }
+
+
+bool verify_ustar_chksum( const uint8_t * const buf )
+  { return ( verify_ustar_magic( buf ) &&
+    ustar_chksum( buf ) == strtoul( (const char *)buf + chksum_o, 0, 8 ) ); }
+
+
+int encode( const std::string & archive_name, const Arg_parser & parser,
+            const int filenames, const int level, const bool append )
+  {
+  struct Lzma_options
+    {
+    int dictionary_size;		// 4 KiB .. 512 MiB
+    int match_len_limit;		// 5 .. 273
+    };
+  const Lzma_options option_mapping[] =
+    {
+    {   65535,  16 },		// -0
+    { 1 << 20,   5 },		// -1
+    { 3 << 19,   6 },		// -2
+    { 1 << 21,   8 },		// -3
+    { 3 << 20,  12 },		// -4
+    { 1 << 22,  20 },		// -5
+    { 1 << 23,  36 },		// -6
+    { 1 << 24,  68 },		// -7
+    { 3 << 23, 132 },		// -8
+    { 1 << 25, 273 } };		// -9
+  const bool compressed = ( level >= 0 && level <= 9 );
+
+  if( !append )
+    {
+    if( !filenames )
+      { show_error( "Cowardly refusing to create an empty archive.", 0, true );
+        return 1; }
+    if( archive_name.empty() ) outfd = STDOUT_FILENO;
+    else if( ( outfd = open_outstream( archive_name ) ) < 0 ) return 1;
+    }
+  else
+    {
+    if( !filenames )
+      { if( verbosity >= 1 ) show_error( "Nothing to append." ); return 0; }
+    if( archive_name.empty() )
+      { show_error( "'--append' is incompatible with '-f -'.", 0, true );
+        return 1; }
+    if( !compressed )
+      { show_error( "'--append' is incompatible with '--uncompressed'.", 0, true );
+        return 1; }
+    if( ( outfd = open_outstream( archive_name, false ) ) < 0 ) return 1;
+    if( !check_appendable() )
+      { show_error( "This does not look like an appendable tar.lz archive." );
+        return 2; }
+    }
+
+  if( compressed )
+    {
+    encoder = LZ_compress_open( option_mapping[level].dictionary_size,
+                option_mapping[level].match_len_limit, LLONG_MAX );
+    if( !encoder || LZ_compress_errno( encoder ) != LZ_ok )
+      {
+      if( !encoder || LZ_compress_errno( encoder ) == LZ_mem_error )
+        show_error( "Not enough memory. Try a lower compression level." );
+      else
+        internal_error( "invalid argument to encoder." );
+      return 1;
+      }
+    }
+
+  int retval = 0;
+  std::string deslashed;		// arg without trailing slashes
+  for( int i = 0; i < parser.arguments(); ++i )		// write members
+    {
+    const int code = parser.code( i );
+    const std::string & arg = parser.argument( i );
+    const char * filename = arg.c_str();
+    if( code == 'C' && chdir( filename ) != 0 )
+      { show_file_error( filename, "Error changing working directory", errno );
+        retval = 1; break; }
+    if( code ) continue;				// skip options
+    unsigned len = arg.size();
+    while( len > 1 && arg[len-1] == '/' ) --len;
+    if( len < arg.size() )
+      { deslashed.assign( arg, 0, len ); filename = deslashed.c_str(); }
+    struct stat st;
+    if( lstat( filename, &st ) != 0 )
+      { show_file_error( filename, "Can't stat input file", errno );
+        if( gretval < 1 ) gretval = 1; }
+    else if( ( retval = nftw( filename, add_member, 16, FTW_PHYS ) ) != 0 )
+      break;			// write error
+    else if( encoder && cl_solid == 1 && !archive_write( 0, 0 ) )	// flush encoder
+      { show_error( "Error flushing encoder", errno ); retval = 1; }
+    }
+
+  if( !retval )			// write End-Of-Archive records
+    {
+    uint8_t buf[header_size];
+    std::memset( buf, 0, header_size );
+    if( encoder && cl_solid == 2 && !archive_write( 0, 0 ) )	// flush encoder
+      { show_error( "Error flushing encoder", errno ); retval = 1; }
+    else if( !archive_write( buf, header_size ) ||
+             !archive_write( buf, header_size ) ||
+             ( encoder && !archive_write( 0, 0 ) ) )	// flush encoder
+      { show_error( "Error writing end-of-archive blocks", errno );
+        retval = 1; }
+    }
+  if( close( outfd ) != 0 && !retval )
+    { show_error( "Error closing archive", errno ); retval = 1; }
+  if( retval && archive_name.size() && !append )
+    std::remove( archive_name.c_str() );
+  if( !retval && gretval )
+    { show_error( "Exiting with failure status due to previous errors." );
+      retval = gretval; }
+  return retval;
+  }
diff --git a/doc/tarlz.1 b/doc/tarlz.1
new file mode 100644
index 0000000..6b685c5
--- /dev/null
+++ b/doc/tarlz.1
@@ -0,0 +1,88 @@
+.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.1.
+.TH TARLZ "1" "April 2018" "tarlz 0.4" "User Commands"
+.SH NAME
+tarlz \- creates tar archives with multimember lzip compression
+.SH SYNOPSIS
+.B tarlz
+[\fI\,options\/\fR] [\fI\,files\/\fR]
+.SH DESCRIPTION
+Tarlz \- Archiver with multimember lzip compression.
+.SH OPTIONS
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+display this help and exit
+.TP
+\fB\-V\fR, \fB\-\-version\fR
+output version information and exit
+.TP
+\fB\-c\fR, \fB\-\-create\fR
+create a new archive
+.TP
+\fB\-C\fR, \fB\-\-directory=\fR<dir>
+change to directory <dir>
+.TP
+\fB\-f\fR, \fB\-\-file=\fR<archive>
+use archive file <archive>
+.TP
+\fB\-q\fR, \fB\-\-quiet\fR
+suppress all messages
+.TP
+\fB\-r\fR, \fB\-\-append\fR
+append files to the end of an archive
+.TP
+\fB\-t\fR, \fB\-\-list\fR
+list the contents of an archive
+.TP
+\fB\-v\fR, \fB\-\-verbose\fR
+verbosely list files processed
+.TP
+\fB\-x\fR, \fB\-\-extract\fR
+extract files from an archive
+.TP
+\fB\-0\fR .. \fB\-9\fR
+set compression level [default 6]
+.TP
+\fB\-\-asolid\fR
+create solidly compressed appendable archive
+.TP
+\fB\-\-dsolid\fR
+create per\-directory compressed archive
+.TP
+\fB\-\-solid\fR
+create solidly compressed archive
+.TP
+\fB\-\-group=\fR<group>
+use <group> name/id for added files
+.TP
+\fB\-\-owner=\fR<owner>
+use <owner> name/id for added files
+.TP
+\fB\-\-uncompressed\fR
+don't compress the created archive
+.PP
+Exit status: 0 for a normal exit, 1 for environmental problems (file
+not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or
+invalid input file, 3 for an internal consistency error (eg, bug) which
+caused tarlz to panic.
+.SH "REPORTING BUGS"
+Report bugs to lzip\-bug@nongnu.org
+.br
+Tarlz home page: http://www.nongnu.org/lzip/tarlz.html
+.SH COPYRIGHT
+Copyright \(co 2018 Antonio Diaz Diaz.
+License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
+.br
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+.SH "SEE ALSO"
+The full documentation for
+.B tarlz
+is maintained as a Texinfo manual.  If the
+.B info
+and
+.B tarlz
+programs are properly installed at your site, the command
+.IP
+.B info tarlz
+.PP
+should give you access to the complete manual.
diff --git a/doc/tarlz.info b/doc/tarlz.info
new file mode 100644
index 0000000..140336b
--- /dev/null
+++ b/doc/tarlz.info
@@ -0,0 +1,311 @@
+This is tarlz.info, produced by makeinfo version 4.13+ from tarlz.texi.
+
+INFO-DIR-SECTION Data Compression
+START-INFO-DIR-ENTRY
+* Tarlz: (tarlz).               Archiver with multimember lzip compression
+END-INFO-DIR-ENTRY
+
+
+File: tarlz.info,  Node: Top,  Next: Introduction,  Up: (dir)
+
+Tarlz Manual
+************
+
+This manual is for Tarlz (version 0.4, 23 April 2018).
+
+* Menu:
+
+* Introduction::           Purpose and features of tarlz
+* Invoking tarlz::         Command line interface
+* Examples::               A small tutorial with examples
+* Problems::               Reporting bugs
+* Concept index::          Index of concepts
+
+
+   Copyright (C) 2013-2018 Antonio Diaz Diaz.
+
+   This manual is free documentation: you have unlimited permission to
+copy, distribute and modify it.
+
+
+File: tarlz.info,  Node: Introduction,  Next: Invoking tarlz,  Prev: Top,  Up: Top
+
+1 Introduction
+**************
+
+Tarlz is a small and simple implementation of the tar archiver. By
+default tarlz creates, lists and extracts archives in the 'ustar' format
+compressed with lzip on a per file basis. Tarlz can append files to the
+end of such compressed archives.
+
+   Each tar member is compressed in its own lzip member, as well as the
+end-of-file blocks. This same method works for any tar format (gnu,
+ustar, posix) and is fully backward compatible with standard tar tools
+like GNU tar, which treat the resulting multimember tar.lz archive like
+any other tar.lz archive.
+
+   Tarlz can create tar archives with four levels of compression
+granularity; per file, per directory, appendable solid, and solid.
+
+   Tarlz is intended as a showcase project for the maintainers of real
+tar programs to evaluate the format and perhaps implement it in their
+tools.
+
+   The diagram below shows the correspondence between tar members
+(formed by a header plus optional data) in the tar archive and lzip
+members in the resulting multimember tar.lz archive: *Note File format:
+(lzip)File format.
+
+tar
++========+======+========+======+========+======+========+
+| header | data | header | data | header | data |   eof  |
++========+======+========+======+========+======+========+
+
+tar.lz
++===============+===============+===============+========+
+|     member    |     member    |     member    | member |
++===============+===============+===============+========+
+
+Of course, compressing each file (or each directory) individually is
+less efficient than compressing the whole tar archive, but it has the
+following advantages:
+
+   * The resulting multimember tar.lz archive can be decompressed in
+     parallel with plzip, multiplying the decompression speed.
+
+   * New members can be appended to the archive (by removing the eof
+     member) just like to an uncompressed tar archive.
+
+   * It is a safe posix-style backup format. In case of corruption,
+     tarlz can extract all the undamaged members from the tar.lz
+     archive, skipping over the damaged members, just like the standard
+     (uncompressed) tar. Moreover, lziprecover can be used to recover at
+     least part of the contents of the damaged members.
+
+   * A multimember tar.lz archive is usually smaller than the
+     corresponding solidly compressed tar.gz archive, except when
+     individually compressing files smaller than about 32 KiB.
+
+
+File: tarlz.info,  Node: Invoking tarlz,  Next: Examples,  Prev: Introduction,  Up: Top
+
+2 Invoking tarlz
+****************
+
+The format for running tarlz is:
+
+     tarlz [OPTIONS] [FILES]
+
+On archive creation or appending, tarlz removes leading and trailing
+slashes from file names, as well as file name prefixes containing a
+'..' component. On extraction, archive members containing a '..'
+component are skipped.
+
+   tarlz supports the following options:
+
+'-h'
+'--help'
+     Print an informative help message describing the options and exit.
+
+'-V'
+'--version'
+     Print the version number of tarlz on the standard output and exit.
+
+'-c'
+'--create'
+     Create a new archive.
+
+'-C DIR'
+'--directory=DIR'
+     Change to directory DIR. When creating or appending, the position
+     of each '-C' option in the command line is significant; it will
+     change the current working directory for the following FILES until
+     a new '-C' option appears in the command line. When extracting, all
+     the '-C' options are executed in sequence before starting the
+     extraction. Listing ignores any '-C' options specified. DIR is
+     relative to the then current working directory, perhaps changed by
+     a previous '-C' option.
+
+'-f ARCHIVE'
+'--file=ARCHIVE'
+     Use archive file ARCHIVE. '-' used as an ARCHIVE argument reads
+     from standard input or writes to standard output.
+
+'-q'
+'--quiet'
+     Quiet operation. Suppress all messages.
+
+'-r'
+'--append'
+     Append files to the end of an archive. The archive must be a
+     regular (seekable) file compressed as a multimember lzip file, and
+     the two end-of-file blocks plus any zero padding must be contained
+     in the last lzip member of the archive. First this last member is
+     removed, then the new members are appended, and then a new
+     end-of-file member is appended to the archive. Exit with status 0
+     without modifying the archive if no FILES have been specified.
+     tarlz can't append files to an uncompressed tar archive.
+
+'-t'
+'--list'
+     List the contents of an archive.
+
+'-v'
+'--verbose'
+     Verbosely list files processed.
+
+'-x'
+'--extract'
+     Extract files from an archive.
+
+'-0 .. -9'
+     Set the compression level. The default compression level is '-6'.
+
+'--asolid'
+     When creating or appending to a compressed archive, use appendable
+     solid compression. All the files being added to the archive are
+     compressed into a single lzip member, but the end-of-file blocks
+     are compressed into a separate lzip member. This creates a solidly
+     compressed appendable archive.
+
+'--dsolid'
+     When creating or appending to a compressed archive, use solid
+     compression for each directory especified in the command line. The
+     end-of-file blocks are compressed into a separate lzip member. This
+     creates a compressed appendable archive with a separate lzip
+     member for each top-level directory.
+
+'--solid'
+     When creating or appending to a compressed archive, use solid
+     compression. The files being added to the archive, along with the
+     end-of-file blocks, are compressed into a single lzip member. The
+     resulting archive is not appendable. No more files can be later
+     appended to the archive without decompressing it first.
+
+'--group=GROUP'
+     When creating or appending, use GROUP for files added to the
+     archive. If GROUP is not a valid group name, it is decoded as a
+     decimal numeric group ID.
+
+'--owner=OWNER'
+     When creating or appending, use OWNER for files added to the
+     archive. If OWNER is not a valid user name, it is decoded as a
+     decimal numeric user ID.
+
+'--uncompressed'
+     With '--create', don't compress the created tar archive. Create an
+     uncompressed tar archive instead.
+
+
+   Exit status: 0 for a normal exit, 1 for environmental problems (file
+not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or
+invalid input file, 3 for an internal consistency error (eg, bug) which
+caused tarlz to panic.
+
+
+File: tarlz.info,  Node: Examples,  Next: Problems,  Prev: Invoking tarlz,  Up: Top
+
+3 A small tutorial with examples
+********************************
+
+Example 1: Create a multimember compressed archive 'archive.tar.lz'
+containing files 'a', 'b' and 'c'.
+
+     tarlz -cf archive.tar.lz a b c
+
+
+Example 2: Append files 'd' and 'e' to the multimember compressed
+archive 'archive.tar.lz'.
+
+     tarlz -rf archive.tar.lz d e
+
+
+Example 3: Create a solidly compressed appendable archive
+'archive.tar.lz' containing files 'a', 'b' and 'c'.  Then append files
+'d' and 'e' to the archive.
+
+     tarlz --asolid -cf archive.tar.lz a b c
+     tarlz --asolid -rf archive.tar.lz d e
+
+
+Example 4: Create a compressed appendable archive containing directories
+'dir1', 'dir2' and 'dir3' with a separate lzip member per directory.
+Then append files 'a', 'b', 'c', 'd' and 'e' to the archive, all of
+them contained in a single lzip member.  The resulting archive
+'archive.tar.lz' contains 5 lzip members (including the eof member).
+
+     tarlz --dsolid -cf archive.tar.lz dir1 dir2 dir3
+     tarlz --asolid -rf archive.tar.lz a b c d e
+
+
+Example 5: Create a solidly compressed archive 'archive.tar.lz'
+containing files 'a', 'b' and 'c'. Note that no more files can be later
+appended to the archive without decompressing it first.
+
+     tarlz --solid -cf archive.tar.lz a b c
+
+
+Example 6: Extract all files from archive 'archive.tar.lz'.
+
+     tarlz -xf archive.tar.lz
+
+
+Example 7: Extract files 'a' and 'c' from archive 'archive.tar.lz'.
+
+     tarlz -xf archive.tar.lz a c
+
+
+Example 8: Copy the contents of directory 'sourcedir' to the directory
+'targetdir'.
+
+     tarlz -C sourcedir -c . | tarlz -C targetdir -x
+
+
+File: tarlz.info,  Node: Problems,  Next: Concept index,  Prev: Examples,  Up: Top
+
+4 Reporting bugs
+****************
+
+There are probably bugs in tarlz. There are certainly errors and
+omissions in this manual. If you report them, they will get fixed. If
+you don't, no one will ever know about them and they will remain unfixed
+for all eternity, if not longer.
+
+   If you find a bug in tarlz, please send electronic mail to
+<lzip-bug@nongnu.org>. Include the version number, which you can find
+by running 'tarlz --version'.
+
+
+File: tarlz.info,  Node: Concept index,  Prev: Problems,  Up: Top
+
+Concept index
+*************
+
+
+* Menu:
+
+* bugs:                                  Problems.              (line 6)
+* examples:                              Examples.              (line 6)
+* getting help:                          Problems.              (line 6)
+* introduction:                          Introduction.          (line 6)
+* invoking:                              Invoking tarlz.        (line 6)
+* options:                               Invoking tarlz.        (line 6)
+* usage:                                 Invoking tarlz.        (line 6)
+* version:                               Invoking tarlz.        (line 6)
+
+
+
+Tag Table:
+Node: Top223
+Node: Introduction785
+Node: Invoking tarlz3280
+Node: Examples7278
+Node: Problems8975
+Node: Concept index9501
+
+End Tag Table
+
+
+Local Variables:
+coding: iso-8859-15
+End:
diff --git a/doc/tarlz.texi b/doc/tarlz.texi
new file mode 100644
index 0000000..db51dd6
--- /dev/null
+++ b/doc/tarlz.texi
@@ -0,0 +1,348 @@
+\input texinfo @c -*-texinfo-*-
+@c %**start of header
+@setfilename tarlz.info
+@documentencoding ISO-8859-15
+@settitle Tarlz Manual
+@finalout
+@c %**end of header
+
+@set UPDATED 23 April 2018
+@set VERSION 0.4
+
+@dircategory Data Compression
+@direntry
+* Tarlz: (tarlz).               Archiver with multimember lzip compression
+@end direntry
+
+
+@ifnothtml
+@titlepage
+@title Tarlz
+@subtitle Archiver with multimember lzip compression
+@subtitle for Tarlz version @value{VERSION}, @value{UPDATED}
+@author by Antonio Diaz Diaz
+
+@page
+@vskip 0pt plus 1filll
+@end titlepage
+
+@contents
+@end ifnothtml
+
+@node Top
+@top
+
+This manual is for Tarlz (version @value{VERSION}, @value{UPDATED}).
+
+@menu
+* Introduction::           Purpose and features of tarlz
+* Invoking tarlz::         Command line interface
+* Examples::               A small tutorial with examples
+* Problems::               Reporting bugs
+* Concept index::          Index of concepts
+@end menu
+
+@sp 1
+Copyright @copyright{} 2013-2018 Antonio Diaz Diaz.
+
+This manual is free documentation: you have unlimited permission
+to copy, distribute and modify it.
+
+
+@node Introduction
+@chapter Introduction
+@cindex introduction
+
+Tarlz is a small and simple implementation of the tar archiver. By
+default tarlz creates, lists and extracts archives in the 'ustar' format
+compressed with lzip on a per file basis. Tarlz can append files to the
+end of such compressed archives.
+
+Each tar member is compressed in its own lzip member, as well as the
+end-of-file blocks. This same method works for any tar format (gnu,
+ustar, posix) and is fully backward compatible with standard tar tools
+like GNU tar, which treat the resulting multimember tar.lz archive like
+any other tar.lz archive.
+
+Tarlz can create tar archives with four levels of compression
+granularity; per file, per directory, appendable solid, and solid.
+
+Tarlz is intended as a showcase project for the maintainers of real tar
+programs to evaluate the format and perhaps implement it in their tools.
+
+The diagram below shows the correspondence between tar members (formed
+by a header plus optional data) in the tar archive and
+@uref{http://www.nongnu.org/lzip/manual/lzip_manual.html#File-format,,lzip members}
+in the resulting multimember tar.lz archive:
+@ifnothtml
+@xref{File format,,,lzip}.
+@end ifnothtml
+
+@verbatim
+tar
++========+======+========+======+========+======+========+
+| header | data | header | data | header | data |   eof  |
++========+======+========+======+========+======+========+
+
+tar.lz
++===============+===============+===============+========+
+|     member    |     member    |     member    | member |
++===============+===============+===============+========+
+@end verbatim
+
+@noindent
+Of course, compressing each file (or each directory) individually is
+less efficient than compressing the whole tar archive, but it has the
+following advantages:
+
+@itemize @bullet
+@item
+The resulting multimember tar.lz archive can be decompressed in
+parallel with plzip, multiplying the decompression speed.
+
+@item
+New members can be appended to the archive (by removing the eof
+member) just like to an uncompressed tar archive.
+
+@item
+It is a safe posix-style backup format. In case of corruption,
+tarlz can extract all the undamaged members from the tar.lz
+archive, skipping over the damaged members, just like the standard
+(uncompressed) tar. Moreover, lziprecover can be used to recover at
+least part of the contents of the damaged members.
+
+@item
+A multimember tar.lz archive is usually smaller than the
+corresponding solidly compressed tar.gz archive, except when
+individually compressing files smaller than about 32 KiB.
+@end itemize
+
+
+@node Invoking tarlz
+@chapter Invoking tarlz
+@cindex invoking
+@cindex options
+@cindex usage
+@cindex version
+
+The format for running tarlz is:
+
+@example
+tarlz [@var{options}] [@var{files}]
+@end example
+
+@noindent
+On archive creation or appending, tarlz removes leading and trailing
+slashes from file names, as well as file name prefixes containing a
+@samp{..} component. On extraction, archive members containing a
+@samp{..} component are skipped.
+
+tarlz supports the following options:
+
+@table @code
+@item -h
+@itemx --help
+Print an informative help message describing the options and exit.
+
+@item -V
+@itemx --version
+Print the version number of tarlz on the standard output and exit.
+
+@item -c
+@itemx --create
+Create a new archive.
+
+@item -C @var{dir}
+@itemx --directory=@var{dir}
+Change to directory @var{dir}. When creating or appending, the position
+of each @code{-C} option in the command line is significant; it will
+change the current working directory for the following @var{files} until
+a new @code{-C} option appears in the command line. When extracting, all
+the @code{-C} options are executed in sequence before starting the
+extraction. Listing ignores any @code{-C} options specified. @var{dir}
+is relative to the then current working directory, perhaps changed by a
+previous @code{-C} option.
+
+@item -f @var{archive}
+@itemx --file=@var{archive}
+Use archive file @var{archive}. @samp{-} used as an @var{archive}
+argument reads from standard input or writes to standard output.
+
+@item -q
+@itemx --quiet
+Quiet operation. Suppress all messages.
+
+@item -r
+@itemx --append
+Append files to the end of an archive. The archive must be a regular
+(seekable) file compressed as a multimember lzip file, and the two
+end-of-file blocks plus any zero padding must be contained in the last
+lzip member of the archive. First this last member is removed, then the
+new members are appended, and then a new end-of-file member is appended
+to the archive. Exit with status 0 without modifying the archive if no
+@var{files} have been specified. tarlz can't append files to an
+uncompressed tar archive.
+
+@item -t
+@itemx --list
+List the contents of an archive.
+
+@item -v
+@itemx --verbose
+Verbosely list files processed.
+
+@item -x
+@itemx --extract
+Extract files from an archive.
+
+@item -0 .. -9
+Set the compression level. The default compression level is @samp{-6}.
+
+@item --asolid
+When creating or appending to a compressed archive, use appendable solid
+compression. All the files being added to the archive are compressed
+into a single lzip member, but the end-of-file blocks are compressed
+into a separate lzip member. This creates a solidly compressed
+appendable archive.
+
+@item --dsolid
+When creating or appending to a compressed archive, use solid
+compression for each directory especified in the command line. The
+end-of-file blocks are compressed into a separate lzip member. This
+creates a compressed appendable archive with a separate lzip member for
+each top-level directory.
+
+@item --solid
+When creating or appending to a compressed archive, use solid
+compression. The files being added to the archive, along with the
+end-of-file blocks, are compressed into a single lzip member. The
+resulting archive is not appendable. No more files can be later appended
+to the archive without decompressing it first.
+
+@item --group=@var{group}
+When creating or appending, use @var{group} for files added to the
+archive. If @var{group} is not a valid group name, it is decoded as a
+decimal numeric group ID.
+
+@item --owner=@var{owner}
+When creating or appending, use @var{owner} for files added to the
+archive. If @var{owner} is not a valid user name, it is decoded as a
+decimal numeric user ID.
+
+@item --uncompressed
+With @code{--create}, don't compress the created tar archive. Create an
+uncompressed tar archive instead.
+
+@end table
+
+Exit status: 0 for a normal exit, 1 for environmental problems (file not
+found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or
+invalid input file, 3 for an internal consistency error (eg, bug) which
+caused tarlz to panic.
+
+
+@node Examples
+@chapter A small tutorial with examples
+@cindex examples
+
+@noindent
+Example 1: Create a multimember compressed archive @samp{archive.tar.lz}
+containing files @samp{a}, @samp{b} and @samp{c}.
+
+@example
+tarlz -cf archive.tar.lz a b c
+@end example
+
+@sp 1
+@noindent
+Example 2: Append files @samp{d} and @samp{e} to the multimember
+compressed archive @samp{archive.tar.lz}.
+
+@example
+tarlz -rf archive.tar.lz d e
+@end example
+
+@sp 1
+@noindent
+Example 3: Create a solidly compressed appendable archive
+@samp{archive.tar.lz} containing files @samp{a}, @samp{b} and @samp{c}.
+Then append files @samp{d} and @samp{e} to the archive.
+
+@example
+tarlz --asolid -cf archive.tar.lz a b c
+tarlz --asolid -rf archive.tar.lz d e
+@end example
+
+@sp 1
+@noindent
+Example 4: Create a compressed appendable archive containing directories
+@samp{dir1}, @samp{dir2} and @samp{dir3} with a separate lzip member per
+directory. Then append files @samp{a}, @samp{b}, @samp{c}, @samp{d} and
+@samp{e} to the archive, all of them contained in a single lzip member.
+The resulting archive @samp{archive.tar.lz} contains 5 lzip members
+(including the eof member).
+
+@example
+tarlz --dsolid -cf archive.tar.lz dir1 dir2 dir3
+tarlz --asolid -rf archive.tar.lz a b c d e
+@end example
+
+@sp 1
+@noindent
+Example 5: Create a solidly compressed archive @samp{archive.tar.lz}
+containing files @samp{a}, @samp{b} and @samp{c}. Note that no more
+files can be later appended to the archive without decompressing it
+first.
+
+@example
+tarlz --solid -cf archive.tar.lz a b c
+@end example
+
+@sp 1
+@noindent
+Example 6: Extract all files from archive @samp{archive.tar.lz}.
+
+@example
+tarlz -xf archive.tar.lz
+@end example
+
+@sp 1
+@noindent
+Example 7: Extract files @samp{a} and @samp{c} from archive
+@samp{archive.tar.lz}.
+
+@example
+tarlz -xf archive.tar.lz a c
+@end example
+
+@sp 1
+@noindent
+Example 8: Copy the contents of directory @samp{sourcedir} to the
+directory @samp{targetdir}.
+
+@example
+tarlz -C sourcedir -c . | tarlz -C targetdir -x
+@end example
+
+
+@node Problems
+@chapter Reporting bugs
+@cindex bugs
+@cindex getting help
+
+There are probably bugs in tarlz. There are certainly errors and
+omissions in this manual. If you report them, they will get fixed. If
+you don't, no one will ever know about them and they will remain unfixed
+for all eternity, if not longer.
+
+If you find a bug in tarlz, please send electronic mail to
+@email{lzip-bug@@nongnu.org}. Include the version number, which you can
+find by running @w{@code{tarlz --version}}.
+
+
+@node Concept index
+@unnumbered Concept index
+
+@printindex cp
+
+@bye
diff --git a/extract.cc b/extract.cc
new file mode 100644
index 0000000..67f4a20
--- /dev/null
+++ b/extract.cc
@@ -0,0 +1,561 @@
+/*  Tarlz - Archiver with multimember lzip compression
+    Copyright (C) 2013-2018 Antonio Diaz Diaz.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <algorithm>
+#include <cerrno>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <stdint.h>
+#include <unistd.h>
+#include <utime.h>
+#include <sys/stat.h>
+#include <lzlib.h>
+
+#include "arg_parser.h"
+#include "lzip.h"
+#include "tarlz.h"
+
+
+namespace {
+
+int gretval = 0;
+
+bool make_path( const std::string & name )
+  {
+  const mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
+  unsigned end = name.size();	// first slash before last component
+
+  while( end > 0 && name[end-1] == '/' ) --end;	// remove trailing slashes
+  while( end > 0 && name[end-1] != '/' ) --end;	// remove last component
+  while( end > 0 && name[end-1] == '/' ) --end;	// remove more slashes
+
+  unsigned index = 0;
+  while( index < end )
+    {
+    while( index < end && name[index] == '/' ) ++index;
+    unsigned first = index;
+    while( index < end && name[index] != '/' ) ++index;
+    if( first < index )
+      {
+      const std::string partial( name, 0, index );
+      struct stat st;
+      if( stat( partial.c_str(), &st ) == 0 )
+        { if( !S_ISDIR( st.st_mode ) ) return false; }
+      else if( mkdir( partial.c_str(), mode ) != 0 )
+        return false;
+      }
+    }
+  return true;
+  }
+
+
+// Returns in buf the first rd bytes of the second lzip member or
+// the first 512 bytes of the second tar member, and sets islz if lzip member
+bool skip_first_member( const int infd, uint8_t * const buf,
+                        int & rd, bool & islz )
+  {
+  while( true )
+    {
+    for( int i = 0; i < rd; ++i )
+      if( buf[i] == 'L' && (*(Lzip_header *)( buf + i )).verify_prefix( rd - i ) )
+        {
+        const int ts = rd - i;				// tail size
+        std::memmove( buf, buf + i, ts );
+        if( ts >= (int)sizeof lzip_magic )
+          { rd = ts; islz = true; return true; }
+        int rd2 = readblock( infd, buf + ts, header_size - ts );
+        if( rd2 != header_size - ts && errno )
+          { show_error( "Error reading archive", errno ); return false; }
+        if( ts + rd2 >= min_member_size &&
+            (*(Lzip_header *)buf).verify_magic() )
+          { rd = ts + rd2; islz = true; return true; }
+        std::memmove( buf, buf + ts, rd2 );
+        int rd3 = readblock( infd, buf + rd2, header_size - rd2 );
+        if( rd3 != header_size - rd2 && errno )
+          { show_error( "Error reading archive", errno ); return false; }
+        rd = rd2 + rd3; i = -1;
+        }
+    if( rd < header_size ) return false;		// eof
+    if( rd == header_size && verify_ustar_chksum( buf ) )
+      { islz = false; return true; }
+    rd = readblock( infd, buf, header_size );
+    if( rd != header_size && errno )
+      { show_error( "Error reading archive", errno ); return false; }
+    }
+  }
+
+
+inline bool block_is_zero( const uint8_t * const buf, const int size )
+  {
+  for( int i = 0; i < size; ++i ) if( buf[i] != 0 ) return false;
+  return true;
+  }
+
+
+bool archive_read( const int infd, uint8_t * const buf, const int size )
+  {
+  static LZ_Decoder * decoder = 0;
+  static bool first_call = true;
+  static bool at_eof = false;
+
+  if( first_call )					// check format
+    {
+    first_call = false;
+    if( size != header_size )
+      internal_error( "size != header_size on first call." );
+    int rd = readblock( infd, buf, size );
+    if( rd != size && errno )
+      { show_error( "Error reading archive", errno ); return false; }
+    bool islz =
+      ( rd >= min_member_size && (*(Lzip_header *)buf).verify_magic() );
+    const bool istar = ( rd == size && verify_ustar_chksum( buf ) );
+    const bool iseof =
+      ( !islz && !istar && rd == size && block_is_zero( buf, size ) );
+    if( !islz && !istar && !iseof )
+      {
+      show_error( "This does not look like a tar archive." );
+      show_error( "Skipping to next header." );
+//      std::fprintf( stderr, "%07o\n", ustar_chksum( buf ) );
+      gretval = 2;
+      if( !skip_first_member( infd, buf, rd, islz ) ) return false;
+      }
+    if( !islz ) return true;				// uncompressed
+    decoder = LZ_decompress_open();			// compressed
+    if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
+      { show_error( "Not enough memory." );
+        LZ_decompress_close( decoder ); return false; }
+    if( LZ_decompress_write( decoder, buf, rd ) != rd )
+      internal_error( "library error (LZ_decompress_write)." );
+    if( !archive_read( infd, buf, size ) ) return false;
+    if( verify_ustar_chksum( buf ) || block_is_zero( buf, size ) ) return true;
+    show_error( "This does not look like a tar archive." );
+    show_error( "Skipping to next header." );
+    gretval = 2;
+    if( LZ_decompress_sync_to_member( decoder ) < 0 )
+      internal_error( "library error (LZ_decompress_sync_to_member)." );
+    }
+
+  if( !decoder )					// uncompressed
+    { if( readblock( infd, buf, size ) == size ) return true;
+      show_error( "Archive ends unexpectedly." ); return false; }
+  const int ibuf_size = 16384;
+  uint8_t ibuf[ibuf_size];
+  int sz = 0;
+  while( sz < size )
+    {
+    if( !at_eof && LZ_decompress_write_size( decoder ) > 0 )
+      {
+      const int rsize = std::min( ibuf_size, LZ_decompress_write_size( decoder ) );
+      const int rd = readblock( infd, ibuf, rsize );
+      if( LZ_decompress_write( decoder, ibuf, rd ) != rd )
+        internal_error( "library error (LZ_decompress_write)." );
+      if( rd < rsize )
+        {
+        at_eof = true; LZ_decompress_finish( decoder );
+        if( errno )
+          { show_error( "Error reading archive", errno ); return false; }
+        }
+      }
+    const int rd = LZ_decompress_read( decoder, buf + sz, size - sz );
+    if( rd < 0 )
+      {
+      show_error( "Skipping to next header." );
+      gretval = 2;
+      if( LZ_decompress_sync_to_member( decoder ) < 0 )
+        internal_error( "library error (LZ_decompress_sync_to_member)." );
+      continue;
+      }
+    if( rd == 0 && LZ_decompress_finished( decoder ) == 1 )
+     { LZ_decompress_close( decoder );
+       show_error( "Archive ends unexpectedly." ); return false; }
+    sz += rd;
+    if( sz == size && LZ_decompress_finished( decoder ) == 1 &&
+        LZ_decompress_close( decoder ) < 0 )
+      { show_error( "LZ_decompress_close failed." ); return false; }
+    }
+  return true;
+  }
+
+
+const char * mode_string( const Tar_header header )
+  {
+  static char buf[11];
+  const Typeflag typeflag = (Typeflag)header[typeflag_o];
+
+  std::memcpy( buf, "----------", sizeof buf - 1 );
+  switch( typeflag )
+    {
+    case tf_regular: break;
+    case tf_link: buf[0] = 'h'; break;
+    case tf_symlink: buf[0] = 'l'; break;
+    case tf_chardev: buf[0] = 'c'; break;
+    case tf_blockdev: buf[0] = 'b'; break;
+    case tf_directory: buf[0] = 'd'; break;
+    case tf_fifo: buf[0] = 'p'; break;
+    case tf_hiperf: buf[0] = 'C'; break;
+    default: buf[0] = '?';
+    }
+  const mode_t mode = strtoul( header + mode_o, 0, 8 );		// 12 bits
+  const bool setuid = mode & S_ISUID;
+  const bool setgid = mode & S_ISGID;
+  const bool sticky = mode & S_ISVTX;
+  if( mode & S_IRUSR ) buf[1] = 'r';
+  if( mode & S_IWUSR ) buf[2] = 'w';
+  if( mode & S_IXUSR ) buf[3] = setuid ? 's' : 'x';
+  else if( setuid ) buf[3] = 'S';
+  if( mode & S_IRGRP ) buf[4] = 'r';
+  if( mode & S_IWGRP ) buf[5] = 'w';
+  if( mode & S_IXGRP ) buf[6] = setgid ? 's' : 'x';
+  else if( setgid ) buf[6] = 'S';
+  if( mode & S_IROTH ) buf[7] = 'r';
+  if( mode & S_IWOTH ) buf[8] = 'w';
+  if( mode & S_IXOTH ) buf[9] = sticky ? 't' : 'x';
+  else if( sticky ) buf[9] = 'T';
+  return buf;
+  }
+
+
+const char * user_group_string( const Tar_header header )
+  {
+  enum { bufsize = uname_l + 1 + gname_l + 1 };
+  static char buf[bufsize];
+
+  if( header[uname_o] && header[gname_o] )
+    snprintf( buf, bufsize, "%.32s/%.32s", header + uname_o, header + gname_o );
+  else
+    {
+    const int uid = strtoul( header + uid_o, 0, 8 );
+    const int gid = strtoul( header + gid_o, 0, 8 );
+    snprintf( buf, bufsize, "%u/%u", uid, gid );
+    }
+  return buf;
+  }
+
+
+const char * link_string( const Tar_header header )
+  {
+  enum { bufsize = 9 + linkname_l + 1 };
+  static char buf[bufsize];
+  const Typeflag typeflag = (Typeflag)header[typeflag_o];
+
+  if( typeflag == tf_link )
+    snprintf( buf, bufsize, " link to %.100s", header + linkname_o );
+  else if( typeflag == tf_symlink )
+    snprintf( buf, bufsize, " -> %.100s", header + linkname_o );
+  else buf[0] = 0;
+  return buf;
+  }
+
+
+void show_member_name( const char * const filename, const Tar_header header,
+                       const int vlevel )
+  {
+  if( verbosity < vlevel ) return;
+  if( verbosity > vlevel )
+    {
+    const time_t mtime = strtoull( header + mtime_o, 0, 8 );	// 33 bits
+    struct tm * tm = localtime( &mtime );
+    std::printf( "%s %s %9llu %4d-%02u-%02u %02u:%02u %s%s\n",
+                 mode_string( header ), user_group_string( header ),
+                 strtoull( header + size_o, 0, 8 ), 1900 + tm->tm_year,
+                 1 + tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min,
+                 filename, link_string( header ) );
+    }
+  else std::printf( "%s\n", filename );
+  std::fflush( stdout );
+  }
+
+
+int list_member( const int infd, const char * const filename,
+                 const unsigned long long file_size, const Tar_header header,
+                 const bool skip )
+  {
+  if( !skip ) show_member_name( filename, header, 0 );
+
+  const unsigned bufsize = 32 * header_size;
+  uint8_t buf[bufsize];
+  unsigned long long rest = file_size;
+  const int rem = file_size % header_size;
+  const int padding = rem ? header_size - rem : 0;
+  while( rest > 0 )
+    {
+    const int rsize = ( rest >= bufsize ) ? bufsize : rest + padding;
+    if( !archive_read( infd, buf, rsize ) ) return 2;
+    if( rest < bufsize ) break;
+    rest -= rsize;
+    }
+  return 0;
+  }
+
+
+bool contains_dotdot( const char * const filename )
+  {
+  for( int i = 0; filename[i]; ++i )
+    if( filename[i] == '.' && filename[i+1] == '.' &&
+        ( i == 0 || filename[i-1] == '/' ) &&
+        ( filename[i+2] == 0 || filename[i+2] == '/' ) ) return true;
+  return false;
+  }
+
+
+int extract_member( const int infd, const char * const filename,
+                    const unsigned long long file_size, const Tar_header header )
+  {
+  if( contains_dotdot( filename ) )
+    {
+    show_file_error( filename, "Contains a '..' component, skipping." );
+    return list_member( infd, filename, file_size, header, true );
+    }
+  const mode_t mode = strtoul( header + mode_o, 0, 8 );		// 12 bits
+  const time_t mtime = strtoull( header + mtime_o, 0, 8 );	// 33 bits
+  const Typeflag typeflag = (Typeflag)header[typeflag_o];
+  const bool islink = ( typeflag == tf_link || typeflag == tf_symlink );
+  int outfd = -1;
+
+  show_member_name( filename, header, 1 );
+  std::remove( filename );
+  make_path( filename );
+  switch( typeflag )
+    {
+    case tf_regular:
+    case tf_hiperf:
+      outfd = open_outstream( filename );
+      if( outfd < 0 ) return 2;
+      chmod( filename, mode );			// ignore errors
+      break;
+    case tf_link:
+    case tf_symlink:
+      {
+      char linkname[linkname_l+1];
+      std::memcpy( linkname, header + linkname_o, linkname_l );
+      linkname[linkname_l] = 0;
+/*      if( contains_dotdot( linkname ) )
+        {
+        show_file_error( filename,
+          "Link destination contains a '..' component, skipping." );
+        return list_member( infd, filename, file_size, header, false );
+        }*/
+      const bool hard = typeflag == tf_link;
+      if( ( hard && link( linkname, filename ) != 0 ) ||
+          ( !hard && symlink( linkname, filename ) != 0 ) )
+        {
+        if( verbosity >= 0 )
+          std::fprintf( stderr, "Can't %slink file '%s' to '%s': %s.\n",
+                        hard ? "" : "sym", linkname, filename,
+                        std::strerror( errno ) );
+        return 2;
+        }
+      } break;
+    case tf_directory:
+      if( mkdir( filename, mode ) != 0 && errno != EEXIST )
+        {
+        show_file_error( filename, "Can't create directory", errno );
+        return 2;
+        }
+      break;
+    case tf_chardev:
+    case tf_blockdev:
+      {
+      const unsigned dev = makedev( strtoul( header + devmajor_o, 0, 8 ),
+                                    strtoul( header + devminor_o, 0, 8 ) );
+      const int dmode = ( typeflag == tf_chardev ? S_IFCHR : S_IFBLK ) | mode;
+      if( mknod( filename, dmode, dev ) != 0 )
+        {
+        show_file_error( filename, "Can't create device node", errno );
+        return 2;
+        }
+      break;
+      }
+    case tf_fifo:
+      if( mkfifo( filename, mode ) != 0 && errno != EEXIST )
+        {
+        show_file_error( filename, "Can't create FIFO file", errno );
+        return 2;
+        }
+      break;
+    default:
+      if( verbosity >= 0 )
+        std::fprintf( stderr, "File type '%c' not supported for file '%s'.\n",
+                      typeflag, filename );
+      return 2;
+    }
+
+  const uid_t uid = (uid_t)strtoul( header + uid_o, 0, 8 );
+  const gid_t gid = (gid_t)strtoul( header + gid_o, 0, 8 );
+  if( !islink && chown( filename, uid, gid ) != 0 &&
+      errno != EPERM && errno != EINVAL )
+    {
+    show_file_error( filename, "Can't change file owner", errno );
+    return 2;
+    }
+
+  const unsigned bufsize = 32 * header_size;
+  uint8_t buf[bufsize];
+  unsigned long long rest = file_size;
+  const int rem = file_size % header_size;
+  const int padding = rem ? header_size - rem : 0;
+  while( rest > 0 )
+    {
+    const int rsize = ( rest >= bufsize ) ? bufsize : rest + padding;
+    if( !archive_read( infd, buf, rsize ) )
+      { if( outfd >= 0 ) { close( outfd ); std::remove( filename ); }
+        return 2; }
+    const int wsize = ( rest >= bufsize ) ? bufsize : rest;
+    if( outfd >= 0 && writeblock( outfd, buf, wsize ) != wsize )
+      { show_file_error( filename, "Error writing file", errno ); return 2; }
+    rest -= wsize;
+    }
+  if( outfd >= 0 && close( outfd ) != 0 )
+    { show_file_error( filename, "Error closing file", errno ); return 2; }
+  if( !islink )
+    {
+    struct utimbuf t;
+    t.actime = mtime;
+    t.modtime = mtime;
+    utime( filename, &t );			// ignore errors
+    }
+  return 0;
+  }
+
+
+const char * remove_leading_slash( const char * const filename )
+  {
+  static bool first_post = true;
+  const char * p = filename;
+
+  while( *p == '/' || ( *p == '.' && p[1] == '/' ) ) ++p;
+  if( p != filename && first_post )
+    {
+    first_post = false;
+    std::string msg( "Removing leading '" );
+    msg.append( filename, p - filename );
+    msg += "' from member names.";
+    show_error( msg.c_str() );
+    }
+  if( *p == 0 ) p = ".";
+  return p;
+  }
+
+
+// return true if dir is a parent directory of name
+bool compare_prefix_dir( const char * const dir, const char * const name )
+  {
+  int len = 0;
+  while( dir[len] && dir[len] == name[len] ) ++len;
+  return ( !dir[len] && len > 0 && ( dir[len-1] == '/' || name[len] == '/' ) );
+  }
+
+
+// compare two file names ignoring trailing slashes
+bool compare_tslash( const char * const name1, const char * const name2 )
+  {
+  const char * p = name1;
+  const char * q = name2;
+  while( *p && *p == *q ) { ++p; ++q; }
+  while( *p == '/' ) ++p;
+  while( *q == '/' ) ++q;
+  return ( !*p && !*q );
+  }
+
+} // end namespace
+
+
+int decode( const std::string & archive_name, const Arg_parser & parser,
+            const int filenames, const bool listing )
+  {
+  const int infd = archive_name.size() ?
+                   open_instream( archive_name ) : STDIN_FILENO;
+  if( infd < 0 ) return 1;
+
+  std::vector< bool > name_pending( parser.arguments(), false );
+  for( int i = 0; i < parser.arguments(); ++i )
+    {
+    const int code = parser.code( i );
+    if( code == 'C' && !listing )
+      {
+      const char * const filename = parser.argument( i ).c_str();
+      if( chdir( filename ) != 0 )
+        { show_file_error( filename, "Error changing working directory", errno );
+          return 1; }
+      }
+    if( !code ) name_pending[i] = true;
+    }
+
+  int retval = 0;
+  bool skipping = false;
+  while( true )			// process one member per iteration
+    {
+    uint8_t buf[header_size];
+    if( !archive_read( infd, buf, header_size ) ) return 2;
+    if( !verify_ustar_chksum( buf ) )
+      {
+      if( block_is_zero( buf, header_size ) ) break;
+      gretval = 2;
+      if( !skipping )
+        { skipping = true; show_error( "Skipping to next header." ); }
+      continue;
+      }
+    skipping = false;
+
+    const char * const header = (const char *)buf;
+    enum { max_filename_size = prefix_l + 1 + name_l + 1 };
+    char stored_name[max_filename_size];
+    int len = 0;
+    while( len < prefix_l && header[prefix_o+len] )
+      { stored_name[len] = header[prefix_o+len]; ++len; }
+    if( len && header[name_o] ) stored_name[len++] = '/';
+    for( int i = 0; i < name_l && header[name_o+i]; ++i )
+      { stored_name[len] = header[name_o+i]; ++len; }
+    while( len > 0 && stored_name[len-1] == '/' ) --len;	// trailing '/'
+    stored_name[len] = 0;
+    const char * const filename = remove_leading_slash( stored_name );
+
+    bool skip = filenames > 0;
+    if( skip )
+      for( int i = 0; i < parser.arguments(); ++i )
+        if( parser.code( i ) == 0 &&
+            ( compare_prefix_dir( parser.argument( i ).c_str(), filename ) ||
+              compare_tslash( filename, parser.argument( i ).c_str() ) ) )
+          { skip = false; name_pending[i] = false; break; }
+
+    const Typeflag typeflag = (Typeflag)header[typeflag_o];
+    const unsigned long long file_size =
+      ( typeflag == tf_regular || typeflag == tf_hiperf ) ?
+        strtoull( header + size_o, 0, 8 ) : 0;
+    if( listing || skip )
+      retval = list_member( infd, filename, file_size, header, skip );
+    else
+      retval = extract_member( infd, filename, file_size, header );
+    if( retval ) return retval;
+    }
+
+  for( int i = 0; i < parser.arguments(); ++i )
+    if( parser.code( i ) == 0 && name_pending[i] )
+      {
+      show_file_error( parser.argument( i ).c_str(), "Not found in archive." );
+      if( gretval < 1 ) gretval = 1;
+      }
+  if( !retval && gretval )
+    { show_error( "Exiting with failure status due to previous errors." );
+      retval = gretval; }
+  return retval;
+  }
diff --git a/lzip.h b/lzip.h
new file mode 100644
index 0000000..03ce788
--- /dev/null
+++ b/lzip.h
@@ -0,0 +1,112 @@
+/*  Tarlz - Archiver with multimember lzip compression
+    Copyright (C) 2013-2018 Antonio Diaz Diaz.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef LZ_API_VERSION
+#define LZ_API_VERSION 1
+#endif
+
+enum {
+  min_dictionary_bits = 12,
+  min_dictionary_size = 1 << min_dictionary_bits,
+  max_dictionary_bits = 29,
+  max_dictionary_size = 1 << max_dictionary_bits,
+  min_member_size = 36 };
+
+
+class CRC32
+  {
+  uint32_t data[256];		// Table of CRCs of all 8-bit messages.
+
+public:
+  CRC32()
+    {
+    for( unsigned n = 0; n < 256; ++n )
+      {
+      unsigned c = n;
+      for( int k = 0; k < 8; ++k )
+        { if( c & 1 ) c = 0xEDB88320U ^ ( c >> 1 ); else c >>= 1; }
+      data[n] = c;
+      }
+    }
+
+  void update_byte( uint32_t & crc, const uint8_t byte ) const
+    { crc = data[(crc^byte)&0xFF] ^ ( crc >> 8 ); }
+  };
+
+
+inline bool isvalid_ds( const unsigned dictionary_size )
+  { return ( dictionary_size >= min_dictionary_size &&
+             dictionary_size <= max_dictionary_size ); }
+
+
+const uint8_t lzip_magic[5] = { 0x4C, 0x5A, 0x49, 0x50, 1 };	// "LZIP\1"
+
+struct Lzip_header
+  {
+  uint8_t data[6];			// 0-3 magic bytes
+					//   4 version
+					//   5 coded_dict_size
+  enum { size = 6 };
+
+  bool verify_magic() const
+    { return ( std::memcmp( data, lzip_magic, 5 ) == 0 ); }
+
+  bool verify_prefix( const int sz ) const	// detect (truncated) header
+    {
+    for( int i = 0; i < sz && i < 5; ++i )
+      if( data[i] != lzip_magic[i] ) return false;
+    return ( sz > 0 );
+    }
+
+  unsigned dictionary_size() const
+    {
+    unsigned sz = ( 1 << ( data[5] & 0x1F ) );
+    if( sz > min_dictionary_size )
+      sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 7 );
+    return sz;
+    }
+  };
+
+
+struct Lzip_trailer
+  {
+  uint8_t data[20];	//  0-3  CRC32 of the uncompressed data
+			//  4-11 size of the uncompressed data
+			// 12-19 member size including header and trailer
+  enum { size = 20 };
+
+  unsigned data_crc() const
+    {
+    unsigned tmp = 0;
+    for( int i = 3; i >= 0; --i ) { tmp <<= 8; tmp += data[i]; }
+    return tmp;
+    }
+
+  unsigned long long data_size() const
+    {
+    unsigned long long tmp = 0;
+    for( int i = 11; i >= 4; --i ) { tmp <<= 8; tmp += data[i]; }
+    return tmp;
+    }
+
+  unsigned long long member_size() const
+    {
+    unsigned long long tmp = 0;
+    for( int i = 19; i >= 12; --i ) { tmp <<= 8; tmp += data[i]; }
+    return tmp;
+    }
+  };
diff --git a/main.cc b/main.cc
new file mode 100644
index 0000000..19a6d31
--- /dev/null
+++ b/main.cc
@@ -0,0 +1,369 @@
+/*  Tarlz - Archiver with multimember lzip compression
+    Copyright (C) 2013-2018 Antonio Diaz Diaz.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*
+    Exit status: 0 for a normal exit, 1 for environmental problems
+    (file not found, invalid flags, I/O errors, etc), 2 to indicate a
+    corrupt or invalid input file, 3 for an internal consistency error
+    (eg, bug) which caused tarlz to panic.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <cctype>
+#include <cerrno>
+#include <climits>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <fcntl.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <grp.h>
+#include <pwd.h>
+#if defined(__OS2__)
+#include <io.h>
+#endif
+
+#include "arg_parser.h"
+#include "tarlz.h"
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+#if CHAR_BIT != 8
+#error "Environments where CHAR_BIT != 8 are not supported."
+#endif
+
+int verbosity = 0;
+
+namespace {
+
+const char * const Program_name = "Tarlz";
+const char * const program_name = "tarlz";
+const char * const program_year = "2018";
+const char * invocation_name = 0;
+
+enum Mode { m_none, m_append, m_create, m_extract, m_list };
+
+
+void show_help()
+  {
+  std::printf( "%s - Archiver with multimember lzip compression.\n", Program_name );
+  std::printf( "\nUsage: %s [options] [files]\n", invocation_name );
+  std::printf( "\nOptions:\n"
+               "  -h, --help                 display this help and exit\n"
+               "  -V, --version              output version information and exit\n"
+               "  -c, --create               create a new archive\n"
+               "  -C, --directory=<dir>      change to directory <dir>\n"
+               "  -f, --file=<archive>       use archive file <archive>\n"
+               "  -q, --quiet                suppress all messages\n"
+               "  -r, --append               append files to the end of an archive\n"
+               "  -t, --list                 list the contents of an archive\n"
+               "  -v, --verbose              verbosely list files processed\n"
+               "  -x, --extract              extract files from an archive\n"
+               "  -0 .. -9                   set compression level [default 6]\n"
+               "      --asolid               create solidly compressed appendable archive\n"
+               "      --dsolid               create per-directory compressed archive\n"
+               "      --solid                create solidly compressed archive\n"
+               "      --group=<group>        use <group> name/id for added files\n"
+               "      --owner=<owner>        use <owner> name/id for added files\n"
+               "      --uncompressed         don't compress the created archive\n"
+               "\nExit status: 0 for a normal exit, 1 for environmental problems (file\n"
+               "not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or\n"
+               "invalid input file, 3 for an internal consistency error (eg, bug) which\n"
+               "caused tarlz to panic.\n"
+               "\nReport bugs to lzip-bug@nongnu.org\n"
+               "Tarlz home page: http://www.nongnu.org/lzip/tarlz.html\n" );
+  }
+
+
+void show_version()
+  {
+  std::printf( "%s %s\n", program_name, PROGVERSION );
+  std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
+  std::printf( "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\n"
+               "This is free software: you are free to change and redistribute it.\n"
+               "There is NO WARRANTY, to the extent permitted by law.\n" );
+  }
+
+
+unsigned long long getnum( const char * const ptr,
+                           const unsigned long long llimit,
+                           const unsigned long long ulimit )
+  {
+  char * tail;
+  errno = 0;
+  unsigned long long result = strtoull( ptr, &tail, 0 );
+  if( tail == ptr )
+    {
+    show_error( "Bad or missing numerical argument.", 0, true );
+    std::exit( 1 );
+    }
+
+  if( !errno && tail[0] )
+    {
+    const unsigned factor = ( tail[1] == 'i' ) ? 1024 : 1000;
+    int exponent = 0;				// 0 = bad multiplier
+    switch( tail[0] )
+      {
+      case 'Y': exponent = 8; break;
+      case 'Z': exponent = 7; break;
+      case 'E': exponent = 6; break;
+      case 'P': exponent = 5; break;
+      case 'T': exponent = 4; break;
+      case 'G': exponent = 3; break;
+      case 'M': exponent = 2; break;
+      case 'K': if( factor == 1024 ) exponent = 1; break;
+      case 'k': if( factor == 1000 ) exponent = 1; break;
+      }
+    if( exponent <= 0 )
+      {
+      show_error( "Bad multiplier in numerical argument.", 0, true );
+      std::exit( 1 );
+      }
+    for( int i = 0; i < exponent; ++i )
+      {
+      if( ulimit / factor >= result ) result *= factor;
+      else { errno = ERANGE; break; }
+      }
+    }
+  if( !errno && ( result < llimit || result > ulimit ) ) errno = ERANGE;
+  if( errno )
+    {
+    show_error( "Numerical argument out of limits." );
+    std::exit( 1 );
+    }
+  return result;
+  }
+
+
+void set_mode( Mode & program_mode, const Mode new_mode )
+  {
+  if( program_mode != m_none && program_mode != new_mode )
+    {
+    show_error( "Only one operation can be specified.", 0, true );
+    std::exit( 1 );
+    }
+  program_mode = new_mode;
+  }
+
+
+void set_owner( const char * const arg )
+  {
+  const struct passwd * const pw = getpwnam( arg );
+  if( pw ) cl_owner = pw->pw_uid;
+  else if( std::isdigit( arg[0] ) ) cl_owner = getnum( arg, 0, INT_MAX );
+  else { show_file_error( arg, "Invalid owner" ); std::exit( 1 ); }
+  }
+
+void set_group( const char * const arg )
+  {
+  const struct group * const gr = getgrnam( arg );
+  if( gr ) cl_group = gr->gr_gid;
+  else if( std::isdigit( arg[0] ) ) cl_group = getnum( arg, 0, INT_MAX );
+  else { show_file_error( arg, "Invalid group" ); std::exit( 1 ); }
+  }
+
+} // end namespace
+
+
+int open_instream( const std::string & name )
+  {
+  const int infd = open( name.c_str(), O_RDONLY | O_BINARY );
+  if( infd < 0 )
+    show_file_error( name.c_str(), "Can't open for reading", errno );
+  return infd;
+  }
+
+
+int open_outstream( const std::string & name, const bool create )
+  {
+  const int flags = (create ? O_CREAT | O_WRONLY | O_TRUNC : O_RDWR) | O_BINARY;
+  const mode_t outfd_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
+
+  const int outfd = open( name.c_str(), flags, outfd_mode );
+  if( outfd < 0 )
+    show_file_error( name.c_str(), create ?
+                     "Can't create file" : "Error opening file", errno );
+  return outfd;
+  }
+
+
+/* Returns the number of bytes really read.
+   If (returned value < size) and (errno == 0), means EOF was reached.
+*/
+int readblock( const int fd, uint8_t * const buf, const int size )
+  {
+  int sz = 0;
+  errno = 0;
+  while( sz < size )
+    {
+    const int n = read( fd, buf + sz, size - sz );
+    if( n > 0 ) sz += n;
+    else if( n == 0 ) break;				// EOF
+    else if( errno != EINTR ) break;
+    errno = 0;
+    }
+  return sz;
+  }
+
+
+/* Returns the number of bytes really written.
+   If (returned value < size), it is always an error.
+*/
+int writeblock( const int fd, const uint8_t * const buf, const int size )
+  {
+  int sz = 0;
+  errno = 0;
+  while( sz < size )
+    {
+    const int n = write( fd, buf + sz, size - sz );
+    if( n > 0 ) sz += n;
+    else if( n < 0 && errno != EINTR ) break;
+    errno = 0;
+    }
+  return sz;
+  }
+
+
+void show_error( const char * const msg, const int errcode, const bool help )
+  {
+  if( verbosity < 0 ) return;
+  if( msg && msg[0] )
+    std::fprintf( stderr, "%s: %s%s%s\n", program_name, msg,
+                  ( errcode > 0 ) ? ": " : "",
+                  ( errcode > 0 ) ? std::strerror( errcode ) : "" );
+  if( help )
+    std::fprintf( stderr, "Try '%s --help' for more information.\n",
+                  invocation_name );
+  }
+
+
+void show_file_error( const char * const filename, const char * const msg,
+                      const int errcode )
+  {
+  if( verbosity >= 0 )
+    std::fprintf( stderr, "%s: %s: %s%s%s\n", program_name, filename, msg,
+                  ( errcode > 0 ) ? ": " : "",
+                  ( errcode > 0 ) ? std::strerror( errcode ) : "" );
+  }
+
+
+void internal_error( const char * const msg )
+  {
+  if( verbosity >= 0 )
+    std::fprintf( stderr, "%s: internal error: %s\n", program_name, msg );
+  std::exit( 3 );
+  }
+
+
+int main( const int argc, const char * const argv[] )
+  {
+  std::string archive_name;
+  Mode program_mode = m_none;
+  int level = 6;		// compression level, < 0 = uncompressed
+  invocation_name = argv[0];
+
+  enum { opt_aso = 256, opt_dso, opt_grp, opt_own, opt_sol, opt_un };
+  const Arg_parser::Option options[] =
+    {
+    { '0',  0,                Arg_parser::no  },
+    { '1',  0,                Arg_parser::no  },
+    { '2',  0,                Arg_parser::no  },
+    { '3',  0,                Arg_parser::no  },
+    { '4',  0,                Arg_parser::no  },
+    { '5',  0,                Arg_parser::no  },
+    { '6',  0,                Arg_parser::no  },
+    { '7',  0,                Arg_parser::no  },
+    { '8',  0,                Arg_parser::no  },
+    { '9',  0,                Arg_parser::no  },
+    { 'c', "create",          Arg_parser::no  },
+    { 'C', "directory",       Arg_parser::yes },
+    { 'f', "file",            Arg_parser::yes },
+    { 'h', "help",            Arg_parser::no  },
+    { 'H', "format",          Arg_parser::yes },
+    { 'q', "quiet",           Arg_parser::no  },
+    { 'r', "append",          Arg_parser::no  },
+    { 't', "list",            Arg_parser::no  },
+    { 'v', "verbose",         Arg_parser::no  },
+    { 'V', "version",         Arg_parser::no  },
+    { 'x', "extract",         Arg_parser::no  },
+    { opt_aso, "asolid",      Arg_parser::no  },
+    { opt_dso, "dsolid",      Arg_parser::no  },
+    { opt_grp, "group",       Arg_parser::yes },
+    { opt_own, "owner",       Arg_parser::yes },
+    { opt_sol, "solid",       Arg_parser::no  },
+    { opt_un, "uncompressed", Arg_parser::no  },
+    {  0 ,  0,                Arg_parser::no  } };
+
+  const Arg_parser parser( argc, argv, options, true );
+  if( parser.error().size() )				// bad option
+    { show_error( parser.error().c_str(), 0, true ); return 1; }
+
+  int filenames = 0;
+  for( int argind = 0; argind < parser.arguments(); ++argind )
+    {
+    const int code = parser.code( argind );
+    if( !code ) { ++filenames; continue; }		// skip non-options
+    const std::string & sarg = parser.argument( argind );
+    const char * const arg = sarg.c_str();
+    switch( code )
+      {
+      case '0': case '1': case '2': case '3': case '4':
+      case '5': case '6': case '7': case '8': case '9':
+                level = code - '0'; break;
+      case 'c': set_mode( program_mode, m_create ); break;
+      case 'C': break;					// skip chdir
+      case 'f': if( sarg != "-" ) archive_name = sarg; break;
+      case 'h': show_help(); return 0;
+      case 'H': break;					// ignore format
+      case 'q': verbosity = -1; break;
+      case 'r': set_mode( program_mode, m_append ); break;
+      case 't': set_mode( program_mode, m_list ); break;
+      case 'v': if( verbosity < 4 ) ++verbosity; break;
+      case 'V': show_version(); return 0;
+      case 'x': set_mode( program_mode, m_extract ); break;
+      case opt_aso: cl_solid = 2; break;
+      case opt_dso: cl_solid = 1; break;
+      case opt_grp: set_group( arg ); break;
+      case opt_own: set_owner( arg ); break;
+      case opt_sol: cl_solid = 3; break;
+      case opt_un: level = -1; break;
+      default : internal_error( "uncaught option" );
+      }
+    } // end process options
+
+#if defined(__MSVCRT__) || defined(__OS2__)
+  setmode( STDIN_FILENO, O_BINARY );
+  setmode( STDOUT_FILENO, O_BINARY );
+#endif
+
+  switch( program_mode )
+    {
+    case m_none: show_error( "Missing operation.", 0, true ); return 2;
+    case m_append:
+    case m_create: return encode( archive_name, parser, filenames, level,
+                                  program_mode == m_append );
+    case m_extract:
+    case m_list:
+      return decode( archive_name, parser, filenames, program_mode == m_list );
+    }
+  }
diff --git a/tarlz.h b/tarlz.h
new file mode 100644
index 0000000..3bb10c9
--- /dev/null
+++ b/tarlz.h
@@ -0,0 +1,68 @@
+/*  Tarlz - Archiver with multimember lzip compression
+    Copyright (C) 2013-2018 Antonio Diaz Diaz.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+enum { header_size = 512 };
+typedef char Tar_header[header_size];
+
+enum Offsets {
+  name_o = 0, mode_o = 100, uid_o = 108, gid_o = 116, size_o = 124,
+  mtime_o = 136, chksum_o = 148, typeflag_o = 156, linkname_o = 157,
+  magic_o = 257, version_o = 263, uname_o = 265, gname_o = 297,
+  devmajor_o = 329, devminor_o = 337, prefix_o = 345 };
+
+enum Lengths {
+  name_l = 100, mode_l = 8, uid_l = 8, gid_l = 8, size_l = 12,
+  mtime_l = 12, chksum_l = 8, typeflag_l = 1, linkname_l = 100,
+  magic_l = 6, version_l = 2, uname_l = 32, gname_l = 32,
+  devmajor_l = 8, devminor_l = 8, prefix_l = 155 };
+
+enum Typeflag {
+  tf_regular = '0', tf_link = '1', tf_symlink = '2', tf_chardev = '3',
+  tf_blockdev = '4', tf_directory = '5', tf_fifo = '6', tf_hiperf = '7' };
+
+const uint8_t ustar_magic[magic_l] =
+  { 0x75, 0x73, 0x74, 0x61, 0x72, 0 };			// "ustar\0"
+
+inline bool verify_ustar_magic( const uint8_t * const buf )
+  { return std::memcmp( buf + magic_o, ustar_magic, magic_l ) == 0; }
+
+
+// defined in create.cc
+extern int cl_owner;
+extern int cl_group;
+extern int cl_solid;
+unsigned ustar_chksum( const uint8_t * const buf );
+bool verify_ustar_chksum( const uint8_t * const buf );
+class Arg_parser;
+int encode( const std::string & archive_name, const Arg_parser & parser,
+            const int filenames, const int level, const bool append );
+
+// defined in extract.cc
+int decode( const std::string & archive_name, const Arg_parser & parser,
+            const int filenames, const bool listing );
+
+// defined in main.cc
+extern int verbosity;
+int open_instream( const std::string & name );
+int open_outstream( const std::string & name, const bool create = true );
+int readblock( const int fd, uint8_t * const buf, const int size );
+int writeblock( const int fd, const uint8_t * const buf, const int size );
+void show_error( const char * const msg, const int errcode = 0,
+                 const bool help = false );
+void show_file_error( const char * const filename, const char * const msg,
+                      const int errcode = 0 );
+void internal_error( const char * const msg );
diff --git a/testsuite/check.sh b/testsuite/check.sh
new file mode 100755
index 0000000..07b0d34
--- /dev/null
+++ b/testsuite/check.sh
@@ -0,0 +1,438 @@
+#! /bin/sh
+# check script for Tarlz - Archiver with multimember lzip compression
+# Copyright (C) 2013-2018 Antonio Diaz Diaz.
+#
+# This script is free software: you have unlimited permission
+# to copy, distribute and modify it.
+
+LC_ALL=C
+export LC_ALL
+objdir=`pwd`
+testdir=`cd "$1" ; pwd`
+TARLZ="${objdir}"/tarlz
+framework_failure() { echo "failure in testing framework" ; exit 1 ; }
+
+if [ ! -f "${TARLZ}" ] || [ ! -x "${TARLZ}" ] ; then
+	echo "${TARLZ}: cannot execute"
+	exit 1
+fi
+
+[ -e "${TARLZ}" ] 2> /dev/null ||
+	{
+	echo "$0: a POSIX shell is required to run the tests"
+	echo "Try bash -c \"$0 $1 $2\""
+	exit 1
+	}
+
+if [ -d tmp ] ; then rm -rf tmp ; fi
+mkdir tmp
+cd "${objdir}"/tmp || framework_failure
+
+in="${testdir}"/test.txt
+in_lz="${testdir}"/test.txt.lz
+in_tar="${testdir}"/test.txt.tar
+in_tar_lz="${testdir}"/test.txt.tar.lz
+test3="${testdir}"/test3.tar
+test3_lz="${testdir}"/test3.tar.lz
+test3a_lz="${testdir}"/test3a.tar.lz
+bad1="${testdir}"/test3_bad1.tar
+bad2="${testdir}"/test3_bad2.tar
+bad3="${testdir}"/test3_bad3.tar
+bad4="${testdir}"/test3_bad4.tar
+bad5="${testdir}"/test3_bad5.tar
+bad1_lz="${testdir}"/test3_bad1.tar.lz
+bad2_lz="${testdir}"/test3_bad2.tar.lz
+bad3_lz="${testdir}"/test3_bad3.tar.lz
+bad4_lz="${testdir}"/test3_bad4.tar.lz
+bad5_lz="${testdir}"/test3_bad5.tar.lz
+bad6_lz="${testdir}"/test3_bad6.tar.lz
+eof_lz="${testdir}"/eof.tar.lz
+fail=0
+test_failed() { fail=1 ; printf " $1" ; [ -z "$2" ] || printf "($2)" ; }
+
+# Description of test files for lziprecover:
+# test3.tar:         3 members (foo bar baz) + 2 zeroed 512-byte blocks
+# test3_bad1.tar:    byte at offset  259 changed from 't' to '0' (magic)
+# test3_bad2.tar:    byte at offset 1283 changed from 't' to '0' (magic)
+# test3_bad3.tar:    byte at offset 2559 changed from 0x00 to 0x20 (padding)
+# test3_bad4.tar:    byte at offset 1283 changed from 't' to '0' (magic)
+#                    byte at offset 2307 changed from 't' to '0' (magic)
+# test3_bad5.tar:    510 zeros + "LZ" prepended to test3.tar (bogus lz header)
+# test3_bad1.tar.lz: byte at offset    2 changed from 'I' to 'i' (magic)
+# test3_bad2.tar.lz: byte at offset   49 changed from 0x49 to 0x69 (mid stream)
+# test3_bad3.tar.lz: byte at offset  149 changed from 0x2D to 0x3D (mid stream)
+# test3_bad4.tar.lz: combined damage of test3_bad2.tar.lz and test3_bad3.tar.lz
+# test3_bad5.tar.lz: [71-134] --> zeroed (first trailer + seconf header)
+# test3_bad6.tar.lz: 510 zeros prepended to test3.tar.lz (header in two blocks)
+
+printf "testing tarlz-%s..." "$2"
+
+"${TARLZ}" -qtf ${in}
+[ $? = 2 ] || test_failed $LINENO
+"${TARLZ}" -qtf ${in_lz}
+[ $? = 2 ] || test_failed $LINENO
+"${TARLZ}" -qtf nx_file
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" -tf 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" -qcf out.tar.lz
+[ $? = 1 ] || test_failed $LINENO
+[ ! -e out.tar.lz ] || test_failed $LINENO
+"${TARLZ}" -rf out.tar.lz || test_failed $LINENO
+[ ! -e out.tar.lz ] || test_failed $LINENO
+"${TARLZ}" -qrf - ${in}
+[ $? = 1 ] || test_failed $LINENO
+[ ! -e - ] || test_failed $LINENO
+"${TARLZ}" -qr ${in}
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" --uncompressed -qrf out.tar ${in}
+[ $? = 1 ] || test_failed $LINENO
+[ ! -e out.tar ] || test_failed $LINENO
+cat ${test3_lz} > test.tar.lz || framework_failure
+"${TARLZ}" --uncompressed -qrf test.tar.lz ${in}
+[ $? = 1 ] || test_failed $LINENO
+cmp ${test3_lz} test.tar.lz || test_failed $LINENO
+rm -f test.tar.lz || framework_failure
+cat ${test3} > test.tar || framework_failure
+"${TARLZ}" -qrf test.tar ${in}
+[ $? = 2 ] || test_failed $LINENO
+cmp ${test3} test.tar || test_failed $LINENO
+rm -f test.tar || framework_failure
+"${TARLZ}" -qc ${in} nx_file > /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" -qc -C nx_dir ${in}
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" -qx -C nx_dir ${test3_lz}
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" -qcr
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" -qct
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" -qcx
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" -qtx
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" -qctx
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" --help > /dev/null || test_failed $LINENO
+"${TARLZ}" -V > /dev/null || test_failed $LINENO
+"${TARLZ}" --bad_option -tf ${test3_lz} 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" -tf 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" --owner=invalid_oner_name -tf ${test3_lz} 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${TARLZ}" --group=invalid_goup_name -tf ${test3_lz} 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+
+"${TARLZ}" -tf ${eof_lz} || test_failed $LINENO
+"${TARLZ}" -xf ${eof_lz} || test_failed $LINENO
+"${TARLZ}" -tf ${in_tar_lz} > /dev/null || test_failed $LINENO
+"${TARLZ}" -xf ${in_tar_lz} || test_failed $LINENO
+cmp ${in} test.txt || test_failed $LINENO
+rm -f test.txt || framework_failure
+"${TARLZ}" -C nx_dir -tf ${in_tar} > /dev/null || test_failed $LINENO
+"${TARLZ}" -xf ${in_tar} || test_failed $LINENO
+cmp ${in} test.txt || test_failed $LINENO
+rm -f test.txt || framework_failure
+
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -xf ${test3_lz} || test_failed $LINENO
+[ -e foo ] || test_failed $LINENO
+[ -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -xf ${test3} || test_failed $LINENO
+[ -e foo ] || test_failed $LINENO
+[ -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${test3a_lz} || test_failed $LINENO
+[ -e dir/foo ] || test_failed $LINENO
+[ -e dir/bar ] || test_failed $LINENO
+[ -e dir/baz ] || test_failed $LINENO
+rm -rf dir || framework_failure
+
+cat ${in} > test.txt || framework_failure
+"${TARLZ}" -0 -cf out.tar.lz test.txt || test_failed $LINENO
+rm -f test.txt || framework_failure
+"${TARLZ}" -xf out.tar.lz || test_failed $LINENO
+cmp ${in} test.txt || test_failed $LINENO
+cat ${in} > test.txt || framework_failure
+"${TARLZ}" --uncompressed -cf out.tar test.txt || test_failed $LINENO
+rm -f test.txt || framework_failure
+"${TARLZ}" -xf out.tar || test_failed $LINENO
+cmp ${in} test.txt || test_failed $LINENO
+rm -f test.txt out.tar out.tar.lz || framework_failure
+
+printf "foo" > foo || framework_failure
+rm -f bar || framework_failure
+printf "baz" > baz || framework_failure
+"${TARLZ}" -qcf out.tar.lz foo bar baz
+[ $? = 1 ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -xf out.tar.lz || test_failed $LINENO
+[ -e foo ] || test_failed $LINENO
+[ ! -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf out.tar.lz bar
+[ $? = 1 ] || test_failed $LINENO
+[ ! -e foo ] || test_failed $LINENO
+[ ! -e bar ] || test_failed $LINENO
+[ ! -e baz ] || test_failed $LINENO
+rm -f out.tar.lz || framework_failure
+
+printf "foo" > foo || framework_failure
+printf "bar" > bar || framework_failure
+printf "baz" > baz || framework_failure
+"${TARLZ}" -0 -cf out.tar.lz foo bar baz || test_failed $LINENO
+"${TARLZ}" --dsolid -0 -cf aout.tar.lz foo bar baz || test_failed $LINENO
+cmp out.tar.lz aout.tar.lz || test_failed $LINENO
+rm -f aout.tar.lz || framework_failure
+"${TARLZ}" -0 -qcf aout.tar.lz foo/ ./bar ./baz/ || test_failed $LINENO
+cmp out.tar.lz aout.tar.lz || test_failed $LINENO
+rm -f aout.tar.lz || framework_failure
+"${TARLZ}" -0 -cf aout.tar.lz foo || test_failed $LINENO
+"${TARLZ}" -0 -rf aout.tar.lz bar baz || test_failed $LINENO
+cmp out.tar.lz aout.tar.lz || test_failed $LINENO
+rm -f aout.tar.lz || framework_failure
+touch aout.tar.lz || framework_failure		# append to empty file
+"${TARLZ}" -0 -rf aout.tar.lz foo bar baz || test_failed $LINENO
+cmp out.tar.lz aout.tar.lz || test_failed $LINENO
+"${TARLZ}" -0 -rf aout.tar.lz || test_failed $LINENO	# append nothing
+cmp out.tar.lz aout.tar.lz || test_failed $LINENO
+"${TARLZ}" -0 -rf aout.tar.lz -C nx_dir || test_failed $LINENO
+cmp out.tar.lz aout.tar.lz || test_failed $LINENO
+"${TARLZ}" -0 -qrf aout.tar.lz nx_file
+[ $? = 1 ] || test_failed $LINENO
+cmp out.tar.lz aout.tar.lz || test_failed $LINENO
+cat ${eof_lz} > aout.tar.lz || framework_failure	# append to empty archive
+"${TARLZ}" -0 -rf aout.tar.lz foo bar baz || test_failed $LINENO
+cmp out.tar.lz aout.tar.lz || test_failed $LINENO
+mv -f foo foo.orig || framework_failure
+mv -f bar bar.orig || framework_failure
+mv -f baz baz.orig || framework_failure
+"${TARLZ}" -xf out.tar.lz foo/ bar// baz/// || test_failed $LINENO
+cmp foo foo.orig || test_failed $LINENO
+cmp bar bar.orig || test_failed $LINENO
+cmp baz baz.orig || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -xf out.tar.lz || test_failed $LINENO
+cmp foo foo.orig || test_failed $LINENO
+cmp bar bar.orig || test_failed $LINENO
+cmp baz baz.orig || test_failed $LINENO
+mkdir dir1 || framework_failure
+"${TARLZ}" -C dir1 -xf out.tar.lz || test_failed $LINENO
+cmp dir1/foo foo.orig || test_failed $LINENO
+cmp dir1/bar bar.orig || test_failed $LINENO
+cmp dir1/baz baz.orig || test_failed $LINENO
+rm -f aout.tar.lz foo bar baz || framework_failure
+"${TARLZ}" -C dir1 -0 -cf aout.tar.lz foo bar baz || test_failed $LINENO
+"${TARLZ}" -xf aout.tar.lz || test_failed $LINENO
+cmp foo foo.orig || test_failed $LINENO
+cmp bar bar.orig || test_failed $LINENO
+cmp baz baz.orig || test_failed $LINENO
+rm -f aout.tar.lz foo bar baz || framework_failure
+"${TARLZ}" -C dir1 -0 -c foo bar baz | "${TARLZ}" -x || test_failed $LINENO
+cmp foo foo.orig || test_failed $LINENO
+cmp bar bar.orig || test_failed $LINENO
+cmp baz baz.orig || test_failed $LINENO
+rm -f dir1/foo dir1/bar dir1/baz || framework_failure
+"${TARLZ}" -0 -c foo bar baz | "${TARLZ}" -C dir1 -x || test_failed $LINENO
+cmp dir1/foo foo.orig || test_failed $LINENO
+cmp dir1/bar bar.orig || test_failed $LINENO
+cmp dir1/baz baz.orig || test_failed $LINENO
+rm -f dir1/foo dir1/bar dir1/baz || framework_failure
+"${TARLZ}" -0 -c foo bar baz | "${TARLZ}" -x foo bar baz -C dir1 ||
+	test_failed $LINENO
+cmp dir1/foo foo.orig || test_failed $LINENO
+cmp dir1/bar bar.orig || test_failed $LINENO
+cmp dir1/baz baz.orig || test_failed $LINENO
+rm -f foo dir1/bar baz || framework_failure
+"${TARLZ}" -0 -cf aout.tar.lz -C dir1 foo -C .. bar -C dir1 baz ||
+	test_failed $LINENO
+cmp out.tar.lz aout.tar.lz || test_failed $LINENO
+"${TARLZ}" -0 -cf aout.tar.lz dir1/foo dir1/baz || test_failed $LINENO
+rm -rf dir1 || framework_failure
+"${TARLZ}" -xf aout.tar.lz dir1 || test_failed $LINENO
+cmp dir1/foo foo.orig || test_failed $LINENO
+cmp dir1/baz baz.orig || test_failed $LINENO
+rm -rf dir1 || framework_failure
+rm -f out.tar.lz aout.tar.lz || framework_failure
+
+# append to solid archive
+printf "foo" > foo || framework_failure
+printf "bar" > bar || framework_failure
+printf "baz" > baz || framework_failure
+"${TARLZ}" --solid -0 -cf out.tar.lz foo || test_failed $LINENO
+for i in --asolid --dsolid --solid -0 ; do
+	"${TARLZ}" $i -qrf out.tar.lz bar baz
+	[ $? = 2 ] || test_failed $LINENO $i
+	[ -e out.tar.lz ] || test_failed $LINENO $i
+done
+rm -f out.tar.lz || framework_failure
+for i in --asolid --dsolid -0 ; do
+	for j in --asolid --dsolid --solid -0 ; do
+		"${TARLZ}" $i -0 -cf out.tar.lz foo ||
+			test_failed $LINENO "$i $j"
+		"${TARLZ}" $j -0 -rf out.tar.lz bar baz ||
+			test_failed $LINENO "$i $j"
+		rm -f foo bar baz || framework_failure
+		"${TARLZ}" -xf out.tar.lz || test_failed $LINENO "$i $j"
+		cmp foo foo.orig || test_failed $LINENO "$i $j"
+		cmp bar bar.orig || test_failed $LINENO "$i $j"
+		cmp baz baz.orig || test_failed $LINENO "$i $j"
+		rm -f out.tar.lz || framework_failure
+	done
+done
+rm -f foo foo.orig bar bar.orig baz baz.orig || framework_failure
+
+mkdir dir1 || framework_failure
+"${TARLZ}" -0 -cf out.tar dir1 || test_failed $LINENO
+rmdir dir1 || framework_failure
+"${TARLZ}" -xf out.tar || test_failed $LINENO
+[ -d dir1 ] || test_failed $LINENO
+rmdir dir1
+mkdir dir1 || framework_failure
+"${TARLZ}" --uncompressed -cf out.tar dir1 || test_failed $LINENO
+rmdir dir1 || framework_failure
+"${TARLZ}" -xf out.tar || test_failed $LINENO
+[ -d dir1 ] || test_failed $LINENO
+rmdir dir1
+rm -f out.tar || framework_failure
+
+if ln ${in} dummy_link 2> /dev/null &&
+   ln -s ${in} dummy_slink 2> /dev/null ; then
+	name_100=name_100_bytes_long_nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
+	path_100=dir1/dir2/dir3/path_100_bytes_long_nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
+	path_106=dir1/dir2/dir3/path_longer_than_100_bytes_nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
+	mkdir dir1 || framework_failure
+	mkdir dir1/dir2 || framework_failure
+	mkdir dir1/dir2/dir3 || framework_failure
+	cat ${in} > dir1/dir2/dir3/in || framework_failure
+	ln dir1/dir2/dir3/in dir1/dir2/dir3/${name_100} || framework_failure
+	ln dir1/dir2/dir3/in ${path_100} || framework_failure
+	ln dir1/dir2/dir3/in ${path_106} || framework_failure
+	ln -s in dir1/dir2/dir3/link || framework_failure
+	ln -s ${name_100} dir1/dir2/dir3/link_100 || framework_failure
+	"${TARLZ}" -0 -cf out.tar dir1 || test_failed $LINENO
+	rm -rf dir1 || framework_failure
+	"${TARLZ}" -xf out.tar || test_failed $LINENO
+	cmp ${in} dir1/dir2/dir3/in || test_failed $LINENO
+	cmp ${in} dir1/dir2/dir3/${name_100} || test_failed $LINENO
+	cmp ${in} ${path_100} || test_failed $LINENO
+	cmp ${in} ${path_106} || test_failed $LINENO
+	cmp ${in} dir1/dir2/dir3/link || test_failed $LINENO
+	cmp ${in} dir1/dir2/dir3/link_100 || test_failed $LINENO
+	rm -f dir1/dir2/dir3/in || framework_failure
+	cmp ${in} dir1/dir2/dir3/link 2> /dev/null && test_failed $LINENO
+	cmp ${in} dir1/dir2/dir3/link_100 || test_failed $LINENO
+	"${TARLZ}" -xf out.tar || test_failed $LINENO
+	rm -f out.tar || framework_failure
+	cmp ${in} dir1/dir2/dir3/in || test_failed $LINENO
+	cmp ${in} dir1/dir2/dir3/link || test_failed $LINENO
+	"${TARLZ}" -0 -qc ../tmp/dir1 > /dev/null || test_failed $LINENO
+	rm -rf dir1 || framework_failure
+else
+	printf "\nwarning: skipping link test: 'ln' does not work on your system."
+fi
+rm -f dummy_link dummy_slink || framework_failure
+
+"${TARLZ}" -qxf "${testdir}"/dotdot1.tar.lz || test_failed $LINENO
+[ ! -e ../dir ] || test_failed $LINENO
+"${TARLZ}" -qxf "${testdir}"/dotdot2.tar.lz || test_failed $LINENO
+[ ! -e ../dir ] || test_failed $LINENO
+"${TARLZ}" -qxf "${testdir}"/dotdot3.tar.lz || test_failed $LINENO
+[ ! -e dir ] || test_failed $LINENO
+"${TARLZ}" -qxf "${testdir}"/dotdot4.tar.lz || test_failed $LINENO
+[ ! -e dir ] || test_failed $LINENO
+"${TARLZ}" -qxf "${testdir}"/dotdot5.tar.lz || test_failed $LINENO
+[ ! -e dir ] || test_failed $LINENO
+
+printf "\ntesting bad input..."
+
+dd if=${in_tar} of=truncated.tar bs=1000 count=1 2> /dev/null
+"${TARLZ}" -qtf truncated.tar > /dev/null
+[ $? = 2 ] || test_failed $LINENO
+"${TARLZ}" -qxf truncated.tar
+[ $? = 2 ] || test_failed $LINENO
+[ ! -e test.txt ] || test_failed $LINENO
+
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad1_lz}
+[ $? = 2 ] || test_failed $LINENO
+[ ! -e foo ] || test_failed $LINENO
+[ -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad2_lz}
+[ $? = 2 ] || test_failed $LINENO
+[ ! -e foo ] || test_failed $LINENO
+[ -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad3_lz}
+[ $? = 2 ] || test_failed $LINENO
+[ -e foo ] || test_failed $LINENO
+[ ! -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad4_lz}
+[ $? = 2 ] || test_failed $LINENO
+[ ! -e foo ] || test_failed $LINENO
+[ ! -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad5_lz}
+[ $? = 2 ] || test_failed $LINENO
+[ ! -e foo ] || test_failed $LINENO
+[ ! -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad6_lz}
+[ $? = 2 ] || test_failed $LINENO
+[ -e foo ] || test_failed $LINENO
+[ -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad1}
+[ $? = 2 ] || test_failed $LINENO
+[ ! -e foo ] || test_failed $LINENO
+[ -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad2}
+[ $? = 2 ] || test_failed $LINENO
+[ -e foo ] || test_failed $LINENO
+[ ! -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad3}
+[ $? = 2 ] || test_failed $LINENO
+[ -e foo ] || test_failed $LINENO
+[ -e bar ] || test_failed $LINENO
+[ ! -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad4}
+[ $? = 2 ] || test_failed $LINENO
+[ -e foo ] || test_failed $LINENO
+[ ! -e bar ] || test_failed $LINENO
+[ ! -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+"${TARLZ}" -qxf ${bad5}
+[ $? = 2 ] || test_failed $LINENO
+[ -e foo ] || test_failed $LINENO
+[ -e bar ] || test_failed $LINENO
+[ -e baz ] || test_failed $LINENO
+rm -f foo bar baz || framework_failure
+
+echo
+if [ ${fail} = 0 ] ; then
+	echo "tests completed successfully."
+	cd "${objdir}" && rm -r tmp
+else
+	echo "tests failed."
+fi
+exit ${fail}
diff --git a/testsuite/dotdot1.tar.lz b/testsuite/dotdot1.tar.lz
new file mode 100644
index 0000000..9884d9f
--- /dev/null
+++ b/testsuite/dotdot1.tar.lz
diff --git a/testsuite/dotdot2.tar.lz b/testsuite/dotdot2.tar.lz
new file mode 100644
index 0000000..a60b898
--- /dev/null
+++ b/testsuite/dotdot2.tar.lz
diff --git a/testsuite/dotdot3.tar.lz b/testsuite/dotdot3.tar.lz
new file mode 100644
index 0000000..163fb5c
--- /dev/null
+++ b/testsuite/dotdot3.tar.lz
diff --git a/testsuite/dotdot4.tar.lz b/testsuite/dotdot4.tar.lz
new file mode 100644
index 0000000..8c6a0ee
--- /dev/null
+++ b/testsuite/dotdot4.tar.lz
diff --git a/testsuite/dotdot5.tar.lz b/testsuite/dotdot5.tar.lz
new file mode 100644
index 0000000..a62cd18
--- /dev/null
+++ b/testsuite/dotdot5.tar.lz
diff --git a/testsuite/eof.tar.lz b/testsuite/eof.tar.lz
new file mode 100644
index 0000000..328273c
--- /dev/null
+++ b/testsuite/eof.tar.lz
diff --git a/testsuite/test.txt b/testsuite/test.txt
new file mode 100644
index 0000000..9196a3a
--- /dev/null
+++ b/testsuite/test.txt
@@ -0,0 +1,676 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
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+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
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+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
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+notices that refer to this License and to the absence of any warranty;
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+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
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+
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+    b) You must cause any work that you distribute or publish, that in
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+
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+These requirements apply to the modified work as a whole.  If
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+the Program or works based on it.
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+  6. Each time you redistribute the Program (or any work based on the
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+infringement or for any other reason (not limited to patent issues),
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+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) <year>  <name of author>
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
+                    GNU GENERAL PUBLIC LICENSE

+                       Version 2, June 1991

+

+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,

+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

+ Everyone is permitted to copy and distribute verbatim copies

+ of this license document, but changing it is not allowed.

+

+                            Preamble

+

+  The licenses for most software are designed to take away your

+freedom to share and change it.  By contrast, the GNU General Public

+License is intended to guarantee your freedom to share and change free

+software--to make sure the software is free for all its users.  This

+General Public License applies to most of the Free Software

+Foundation's software and to any other program whose authors commit to

+using it.  (Some other Free Software Foundation software is covered by

+the GNU Lesser General Public License instead.)  You can apply it to

+your programs, too.

+

+  When we speak of free software, we are referring to freedom, not

+price.  Our General Public Licenses are designed to make sure that you

+have the freedom to distribute copies of free software (and charge for

+this service if you wish), that you receive source code or can get it

+if you want it, that you can change the software or use pieces of it

+in new free programs; and that you know you can do these things.

+

+  To protect your rights, we need to make restrictions that forbid

+anyone to deny you these rights or to ask you to surrender the rights.

+These restrictions translate to certain responsibilities for you if you

+distribute copies of the software, or if you modify it.

+

+  For example, if you distribute copies of such a program, whether

+gratis or for a fee, you must give the recipients all the rights that

+you have.  You must make sure that they, too, receive or can get the

+source code.  And you must show them these terms so they know their

+rights.

+

+  We protect your rights with two steps: (1) copyright the software, and

+(2) offer you this license which gives you legal permission to copy,

+distribute and/or modify the software.

+

+  Also, for each author's protection and ours, we want to make certain

+that everyone understands that there is no warranty for this free

+software.  If the software is modified by someone else and passed on, we

+want its recipients to know that what they have is not the original, so

+that any problems introduced by others will not reflect on the original

+authors' reputations.

+

+  Finally, any free program is threatened constantly by software

+patents.  We wish to avoid the danger that redistributors of a free

+program will individually obtain patent licenses, in effect making the

+program proprietary.  To prevent this, we have made it clear that any

+patent must be licensed for everyone's free use or not licensed at all.

+

+  The precise terms and conditions for copying, distribution and

+modification follow.

+

+                    GNU GENERAL PUBLIC LICENSE

+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

+

+  0. This License applies to any program or other work which contains

+a notice placed by the copyright holder saying it may be distributed

+under the terms of this General Public License.  The "Program", below,

+refers to any such program or work, and a "work based on the Program"

+means either the Program or any derivative work under copyright law:

+that is to say, a work containing the Program or a portion of it,

+either verbatim or with modifications and/or translated into another

+language.  (Hereinafter, translation is included without limitation in

+the term "modification".)  Each licensee is addressed as "you".

+

+Activities other than copying, distribution and modification are not

+covered by this License; they are outside its scope.  The act of

+running the Program is not restricted, and the output from the Program

+is covered only if its contents constitute a work based on the

+Program (independent of having been made by running the Program).

+Whether that is true depends on what the Program does.

+

+  1. You may copy and distribute verbatim copies of the Program's

+source code as you receive it, in any medium, provided that you

+conspicuously and appropriately publish on each copy an appropriate

+copyright notice and disclaimer of warranty; keep intact all the

+notices that refer to this License and to the absence of any warranty;

+and give any other recipients of the Program a copy of this License

+along with the Program.

+

+You may charge a fee for the physical act of transferring a copy, and

+you may at your option offer warranty protection in exchange for a fee.

+

+  2. You may modify your copy or copies of the Program or any portion

+of it, thus forming a work based on the Program, and copy and

+distribute such modifications or work under the terms of Section 1

+above, provided that you also meet all of these conditions:

+

+    a) You must cause the modified files to carry prominent notices

+    stating that you changed the files and the date of any change.

+

+    b) You must cause any work that you distribute or publish, that in

+    whole or in part contains or is derived from the Program or any

+    part thereof, to be licensed as a whole at no charge to all third

+    parties under the terms of this License.

+

+    c) If the modified program normally reads commands interactively

+    when run, you must cause it, when started running for such

+    interactive use in the most ordinary way, to print or display an

+    announcement including an appropriate copyright notice and a

+    notice that there is no warranty (or else, saying that you provide

+    a warranty) and that users may redistribute the program under

+    these conditions, and telling the user how to view a copy of this

+    License.  (Exception: if the Program itself is interactive but

+    does not normally print such an announcement, your work based on

+    the Program is not required to print an announcement.)

+

+These requirements apply to the modified work as a whole.  If

+identifiable sections of that work are not derived from the Program,

+and can be reasonably considered independent and separate works in

+themselves, then this License, and its terms, do not apply to those

+sections when you distribute them as separate works.  But when you

+distribute the same sections as part of a whole which is a work based

+on the Program, the distribution of the whole must be on the terms of

+this License, whose permissions for other licensees extend to the

+entire whole, and thus to each and every part regardless of who wrote it.

+

+Thus, it is not the intent of this section to claim rights or contest

+your rights to work written entirely by you; rather, the intent is to

+exercise the right to control the distribution of derivative or

+collective works based on the Program.

+

+In addition, mere aggregation of another work not based on the Program

+with the Program (or with a work based on the Program) on a volume of

+a storage or distribution medium does not bring the other work under

+the scope of this License.

+

+  3. You may copy and distribute the Program (or a work based on it,

+under Section 2) in object code or executable form under the terms of

+Sections 1 and 2 above provided that you also do one of the following:

+

+    a) Accompany it with the complete corresponding machine-readable

+    source code, which must be distributed under the terms of Sections

+    1 and 2 above on a medium customarily used for software interchange; or,

+

+    b) Accompany it with a written offer, valid for at least three

+    years, to give any third party, for a charge no more than your

+    cost of physically performing source distribution, a complete

+    machine-readable copy of the corresponding source code, to be

+    distributed under the terms of Sections 1 and 2 above on a medium

+    customarily used for software interchange; or,

+

+    c) Accompany it with the information you received as to the offer

+    to distribute corresponding source code.  (This alternative is

+    allowed only for noncommercial distribution and only if you

+    received the program in object code or executable form with such

+    an offer, in accord with Subsection b above.)

+

+The source code for a work means the preferred form of the work for

+making modifications to it.  For an executable work, complete source

+code means all the source code for all modules it contains, plus any

+associated interface definition files, plus the scripts used to

+control compilation and installation of the executable.  However, as a

+special exception, the source code distributed need not include

+anything that is normally distributed (in either source or binary

+form) with the major components (compiler, kernel, and so on) of the

+operating system on which the executable runs, unless that component

+itself accompanies the executable.

+

+If distribution of executable or object code is made by offering

+access to copy from a designated place, then offering equivalent

+access to copy the source code from the same place counts as

+distribution of the source code, even though third parties are not

+compelled to copy the source along with the object code.

+

+  4. You may not copy, modify, sublicense, or distribute the Program

+except as expressly provided under this License.  Any attempt

+otherwise to copy, modify, sublicense or distribute the Program is

+void, and will automatically terminate your rights under this License.

+However, parties who have received copies, or rights, from you under

+this License will not have their licenses terminated so long as such

+parties remain in full compliance.

+

+  5. You are not required to accept this License, since you have not

+signed it.  However, nothing else grants you permission to modify or

+distribute the Program or its derivative works.  These actions are

+prohibited by law if you do not accept this License.  Therefore, by

+modifying or distributing the Program (or any work based on the

+Program), you indicate your acceptance of this License to do so, and

+all its terms and conditions for copying, distributing or modifying

+the Program or works based on it.

+

+  6. Each time you redistribute the Program (or any work based on the

+Program), the recipient automatically receives a license from the

+original licensor to copy, distribute or modify the Program subject to

+these terms and conditions.  You may not impose any further

+restrictions on the recipients' exercise of the rights granted herein.

+You are not responsible for enforcing compliance by third parties to

+this License.

+

+  7. If, as a consequence of a court judgment or allegation of patent

+infringement or for any other reason (not limited to patent issues),

+conditions are imposed on you (whether by court order, agreement or

+otherwise) that contradict the conditions of this License, they do not

+excuse you from the conditions of this License.  If you cannot

+distribute so as to satisfy simultaneously your obligations under this

+License and any other pertinent obligations, then as a consequence you

+may not distribute the Program at all.  For example, if a patent

+license would not permit royalty-free redistribution of the Program by

+all those who receive copies directly or indirectly through you, then

+the only way you could satisfy both it and this License would be to

+refrain entirely from distribution of the Program.

+

+If any portion of this section is held invalid or unenforceable under

+any particular circumstance, the balance of the section is intended to

+apply and the section as a whole is intended to apply in other

+circumstances.

+

+It is not the purpose of this section to induce you to infringe any

+patents or other property right claims or to contest validity of any

+such claims; this section has the sole purpose of protecting the

+integrity of the free software distribution system, which is

+implemented by public license practices.  Many people have made

+generous contributions to the wide range of software distributed

+through that system in reliance on consistent application of that

+system; it is up to the author/donor to decide if he or she is willing

+to distribute software through any other system and a licensee cannot

+impose that choice.

+

+This section is intended to make thoroughly clear what is believed to

+be a consequence of the rest of this License.

+

+  8. If the distribution and/or use of the Program is restricted in

+certain countries either by patents or by copyrighted interfaces, the

+original copyright holder who places the Program under this License

+may add an explicit geographical distribution limitation excluding

+those countries, so that distribution is permitted only in or among

+countries not thus excluded.  In such case, this License incorporates

+the limitation as if written in the body of this License.

+

+  9. The Free Software Foundation may publish revised and/or new versions

+of the General Public License from time to time.  Such new versions will

+be similar in spirit to the present version, but may differ in detail to

+address new problems or concerns.

+

+Each version is given a distinguishing version number.  If the Program

+specifies a version number of this License which applies to it and "any

+later version", you have the option of following the terms and conditions

+either of that version or of any later version published by the Free

+Software Foundation.  If the Program does not specify a version number of

+this License, you may choose any version ever published by the Free Software

+Foundation.

+

+  10. If you wish to incorporate parts of the Program into other free

+programs whose distribution conditions are different, write to the author

+to ask for permission.  For software which is copyrighted by the Free

+Software Foundation, write to the Free Software Foundation; we sometimes

+make exceptions for this.  Our decision will be guided by the two goals

+of preserving the free status of all derivatives of our free software and

+of promoting the sharing and reuse of software generally.

+

+                            NO WARRANTY

+

+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY

+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN

+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES

+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED

+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS

+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE

+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,

+REPAIR OR CORRECTION.

+

+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING

+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR

+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,

+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING

+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED

+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY

+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER

+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE

+POSSIBILITY OF SUCH DAMAGES.

+

+                     END OF TERMS AND CONDITIONS

+

+            How to Apply These Terms to Your New Programs

+

+  If you develop a new program, and you want it to be of the greatest

+possible use to the public, the best way to achieve this is to make it

+free software which everyone can redistribute and change under these terms.

+

+  To do so, attach the following notices to the program.  It is safest

+to attach them to the start of each source file to most effectively

+convey the exclusion of warranty; and each file should have at least

+the "copyright" line and a pointer to where the full notice is found.

+

+    <one line to give the program's name and a brief idea of what it does.>

+    Copyright (C) <year>  <name of author>

+

+    This program is free software: you can redistribute it and/or modify

+    it under the terms of the GNU General Public License as published by

+    the Free Software Foundation, either version 2 of the License, or

+    (at your option) any later version.

+

+    This program is distributed in the hope that it will be useful,

+    but WITHOUT ANY WARRANTY; without even the implied warranty of

+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+    GNU General Public License for more details.

+

+    You should have received a copy of the GNU General Public License

+    along with this program.  If not, see <http://www.gnu.org/licenses/>.

+

+Also add information on how to contact you by electronic and paper mail.

+

+If the program is interactive, make it output a short notice like this

+when it starts in an interactive mode:

+

+    Gnomovision version 69, Copyright (C) <year>  <name of author>

+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.

+    This is free software, and you are welcome to redistribute it

+    under certain conditions; type `show c' for details.

+

+The hypothetical commands `show w' and `show c' should show the appropriate

+parts of the General Public License.  Of course, the commands you use may

+be called something other than `show w' and `show c'; they could even be

+mouse-clicks or menu items--whatever suits your program.

+

+You should also get your employer (if you work as a programmer) or your

+school, if any, to sign a "copyright disclaimer" for the program, if

+necessary.  Here is a sample; alter the names:

+

+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program

+  `Gnomovision' (which makes passes at compilers) written by James Hacker.

+

+  <signature of Ty Coon>, 1 April 1989

+  Ty Coon, President of Vice

+

+This General Public License does not permit incorporating your program into

+proprietary programs.  If your program is a subroutine library, you may

+consider it more useful to permit linking proprietary applications with the

+library.  If this is what you want to do, use the GNU Lesser General

+Public License instead of this License.

diff --git a/testsuite/test.txt.lz b/testsuite/test.txt.lz
new file mode 100644
index 0000000..46f98a7
--- /dev/null
+++ b/testsuite/test.txt.lz
diff --git a/testsuite/test.txt.tar b/testsuite/test.txt.tar
new file mode 100644
index 0000000..d687b43
--- /dev/null
+++ b/testsuite/test.txt.tar
diff --git a/testsuite/test.txt.tar.lz b/testsuite/test.txt.tar.lz
new file mode 100644
index 0000000..15c0131
--- /dev/null
+++ b/testsuite/test.txt.tar.lz
diff --git a/testsuite/test3.tar b/testsuite/test3.tar
new file mode 100644
index 0000000..d58fb45
--- /dev/null
+++ b/testsuite/test3.tar
diff --git a/testsuite/test3.tar.lz b/testsuite/test3.tar.lz
new file mode 100644
index 0000000..779ace4
--- /dev/null
+++ b/testsuite/test3.tar.lz
diff --git a/testsuite/test3_bad1.tar b/testsuite/test3_bad1.tar
new file mode 100644
index 0000000..005b6a3
--- /dev/null
+++ b/testsuite/test3_bad1.tar
diff --git a/testsuite/test3_bad1.tar.lz b/testsuite/test3_bad1.tar.lz
new file mode 100644
index 0000000..9f5d40f
--- /dev/null
+++ b/testsuite/test3_bad1.tar.lz
diff --git a/testsuite/test3_bad2.tar b/testsuite/test3_bad2.tar
new file mode 100644
index 0000000..d2c546b
--- /dev/null
+++ b/testsuite/test3_bad2.tar
diff --git a/testsuite/test3_bad2.tar.lz b/testsuite/test3_bad2.tar.lz
new file mode 100644
index 0000000..182c048
--- /dev/null
+++ b/testsuite/test3_bad2.tar.lz
diff --git a/testsuite/test3_bad3.tar b/testsuite/test3_bad3.tar
new file mode 100644
index 0000000..7d78e87
--- /dev/null
+++ b/testsuite/test3_bad3.tar
diff --git a/testsuite/test3_bad3.tar.lz b/testsuite/test3_bad3.tar.lz
new file mode 100644
index 0000000..c711a1a
--- /dev/null
+++ b/testsuite/test3_bad3.tar.lz
diff --git a/testsuite/test3_bad4.tar b/testsuite/test3_bad4.tar
new file mode 100644
index 0000000..68312b3
--- /dev/null
+++ b/testsuite/test3_bad4.tar
diff --git a/testsuite/test3_bad4.tar.lz b/testsuite/test3_bad4.tar.lz
new file mode 100644
index 0000000..226db72
--- /dev/null
+++ b/testsuite/test3_bad4.tar.lz
diff --git a/testsuite/test3_bad5.tar b/testsuite/test3_bad5.tar
new file mode 100644
index 0000000..e482969
--- /dev/null
+++ b/testsuite/test3_bad5.tar
diff --git a/testsuite/test3_bad5.tar.lz b/testsuite/test3_bad5.tar.lz
new file mode 100644
index 0000000..5b4feb3
--- /dev/null
+++ b/testsuite/test3_bad5.tar.lz
diff --git a/testsuite/test3_bad6.tar.lz b/testsuite/test3_bad6.tar.lz
new file mode 100644
index 0000000..42b3888
--- /dev/null
+++ b/testsuite/test3_bad6.tar.lz
diff --git a/testsuite/test3a.tar.lz b/testsuite/test3a.tar.lz
new file mode 100644
index 0000000..8eb3f43
--- /dev/null
+++ b/testsuite/test3a.tar.lz