Adding upstream version 0.3.upstream/0.3

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
author: Daniel Baumann <mail@daniel-baumann.ch> 2015-11-07 13:32:21 +0000
committer: Daniel Baumann <mail@daniel-baumann.ch> 2015-11-07 13:32:21 +0000
commit: a061471f450a2efc60371f90ac9483c8ed4375fd (patch)
tree: 640c3865c87f5e32bf0e98aac1edb0221c96c39c
parent: Initial commit. (diff)
download: lzlib-a061471f450a2efc60371f90ac9483c8ed4375fd.tar.xz
lzlib-a061471f450a2efc60371f90ac9483c8ed4375fd.zip
22 files changed, 5877 insertions, 0 deletions
diff --git a/AUTHORS b/AUTHORS
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--- /dev/null
+++ b/AUTHORS
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+Lzlib was written by Antonio Diaz Diaz.
+
+Lzlib implements a simplified version of the LZMA algorithm. The
+original LZMA algorithm was designed by Igor Pavlov.
+
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..5b244d5
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,676 @@
+
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+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  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.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+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.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+		     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
+state 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 3 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 does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program 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, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU 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.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+
diff --git a/ChangeLog b/ChangeLog
new file mode 100644
index 0000000..f90fe5f
--- /dev/null
+++ b/ChangeLog
@@ -0,0 +1,21 @@
+2009-05-03  Antonio Diaz  <ant_diaz@teleline.es>
+
+	* Version 0.3 released.
+	* Lzilib is now built as a shared library (in addition to static).
+
+2009-04-26  Antonio Diaz  <ant_diaz@teleline.es>
+
+	* Version 0.2 released.
+	* Fixed a segfault when decompressing trailing garbage.
+	* Fixed a false positive in LZ_(de)compress_finished.
+
+2009-04-21  Antonio Diaz  <ant_diaz@teleline.es>
+
+	* Version 0.1 released.
+
+
+Copyright (C) 2009 Antonio Diaz Diaz.
+
+This file is a collection of facts, and thus it is not copyrightable,
+but just in case, I give you unlimited permission to copy, distribute
+and modify it.
diff --git a/INSTALL b/INSTALL
new file mode 100644
index 0000000..be94132
--- /dev/null
+++ b/INSTALL
@@ -0,0 +1,57 @@
+Requirements
+------------
+You will need a C++ compiler.
+I use gcc 4.3.3 and 3.3.6, but the code should compile with any
+standards compliant compiler.
+Gcc is available at http://gcc.gnu.org.
+
+
+Procedure
+---------
+1. Unpack the archive if you have not done so already:
+
+	lzip -cd lzlib[version].tar.lz | tar -xf -
+or
+	gzip -cd lzlib[version].tar.gz | tar -xf -
+
+This creates the directory ./lzlib[version] containing the source from
+the main archive.
+
+2. Change to lzlib directory and run configure.
+   (Try `configure --help' for usage instructions).
+
+	cd lzlib[version]
+	./configure
+
+3. Run make.
+
+	make
+
+4. Optionally, type `make check' to run the tests that come with lzlib.
+
+5. Type `make install' to install the library and any data files and
+   documentation. (You might have to run ldconfig also).
+
+
+
+Another way
+-----------
+You can also compile lzlib 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) 2009 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..2249365
--- /dev/null
+++ b/Makefile.in
@@ -0,0 +1,134 @@
+
+DISTNAME = $(pkgname)-$(pkgversion)
+AR = ar
+INSTALL = install
+INSTALL_PROGRAM = $(INSTALL) -p -m 755
+INSTALL_DATA = $(INSTALL) -p -m 644
+LDCONFIG = ldconfig
+SHELL = /bin/sh
+
+lib_objs    = decoder.o encoder.o lzlib.o
+sh_lib_objs = sh_decoder.o sh_encoder.o sh_lzlib.o
+objs        = arg_parser.o main.o
+
+
+.PHONY : all doc check install install-info \
+         uninstall uninstall-info \
+         dist clean distclean
+
+all : $(progname) $(progname_shared)
+
+$(libname).a: $(lib_objs)
+	$(AR) -rcs $(libname).a $(lib_objs)
+
+$(libname).so.$(pkgversion) : $(sh_lib_objs)
+	$(CXX) -shared -Wl,--soname=$(libname).so.$(soversion) -o $(libname).so.$(pkgversion) $(sh_lib_objs)
+
+$(progname) : $(objs) $(libname).a
+	$(CXX) $(LDFLAGS) -o $(progname) $(objs) $(libname).a
+
+$(progname)_shared : $(objs) $(libname).so.$(pkgversion)
+	$(CXX) $(LDFLAGS) -o $(progname)_shared $(objs) $(libname).so.$(pkgversion)
+
+$(progname)_profiled : $(objs) $(libname).a
+	$(CXX) $(LDFLAGS) -pg -o $(progname)_profiled $(objs) $(libname).a
+
+main.o : main.cc
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -DPROGVERSION=\"$(pkgversion)\" -c -o $@ $<
+
+%.o : %.cc
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
+
+sh_decoder.o : decoder.cc
+	$(CXX) -fpic -fPIC $(CPPFLAGS) $(CXXFLAGS) -c -o sh_decoder.o $<
+
+sh_encoder.o : encoder.cc
+	$(CXX) -fpic -fPIC $(CPPFLAGS) $(CXXFLAGS) -c -o sh_encoder.o $<
+
+sh_lzlib.o : lzlib.cc
+	$(CXX) -fpic -fPIC $(CPPFLAGS) $(CXXFLAGS) -c -o sh_lzlib.o $<
+
+$(lib_objs)    : Makefile lzlib.h lzip.h
+$(sh_lib_objs) : Makefile lzlib.h lzip.h
+decoder.o      : decoder.h
+encoder.o      : encoder.h
+lzlib.o        : decoder.h encoder.h
+sh_decoder.o   : decoder.h
+sh_encoder.o   : encoder.h
+sh_lzlib.o     : decoder.h encoder.h
+arg_parser.o   : Makefile arg_parser.h
+main.o         : Makefile arg_parser.h lzlib.h $(libname).a
+
+
+doc : info $(VPATH)/doc/$(progname).1
+
+info : $(VPATH)/doc/$(pkgname).info
+
+$(VPATH)/doc/$(pkgname).info : $(VPATH)/doc/$(pkgname).texinfo
+	cd $(VPATH)/doc && makeinfo $(pkgname).texinfo
+
+$(VPATH)/doc/$(progname).1 : $(progname)
+	help2man -o $(VPATH)/doc/$(progname).1 ./$(progname)
+
+Makefile : $(VPATH)/configure $(VPATH)/Makefile.in
+	./config.status
+
+check : all $(VPATH)/testsuite/check.sh
+	@$(VPATH)/testsuite/check.sh $(VPATH)/testsuite
+
+install : all install-info
+	if test ! -d $(DESTDIR)$(includedir) ; then $(INSTALL) -d $(DESTDIR)$(includedir) ; fi
+	if test ! -d $(DESTDIR)$(libdir) ; then $(INSTALL) -d $(DESTDIR)$(libdir) ; fi
+	$(INSTALL_DATA) $(VPATH)/$(pkgname).h $(DESTDIR)$(includedir)/$(pkgname).h
+	$(INSTALL_DATA) ./$(libname).a $(DESTDIR)$(libdir)/$(libname).a
+	if test -n "$(progname_shared)" ; then \
+	  $(INSTALL_PROGRAM) ./$(libname).so.$(pkgversion) $(DESTDIR)$(libdir)/$(libname).so.$(pkgversion) ; \
+	  if test -a $(DESTDIR)$(libdir)/$(libname).so.$(soversion) ; then \
+	    run_ldconfig=no ; rm -f $(DESTDIR)$(libdir)/$(libname).so.$(soversion) ; \
+	  else run_ldconfig=yes ; \
+	  fi ; \
+	  cd $(DESTDIR)$(libdir) && ln -s $(libname).so.$(pkgversion) $(libname).so.$(soversion) ; \
+	  if test $${run_ldconfig} = yes ; then $(LDCONFIG) $(DESTDIR)$(libdir) ; fi ; \
+	fi
+
+install-info :
+	if test ! -d $(DESTDIR)$(infodir) ; then $(INSTALL) -d $(DESTDIR)$(infodir) ; fi
+	$(INSTALL_DATA) $(VPATH)/doc/$(pkgname).info $(DESTDIR)$(infodir)/$(pkgname).info
+	-install-info --info-dir=$(DESTDIR)$(infodir) $(DESTDIR)$(infodir)/$(pkgname).info
+
+uninstall : uninstall-info
+	-rm -f $(DESTDIR)$(includedir)/$(pkgname).h
+	-rm -f $(DESTDIR)$(libdir)/$(libname).a
+	-rm -f $(DESTDIR)$(libdir)/$(libname).so.$(soversion)
+	-rm -f $(DESTDIR)$(libdir)/$(libname).so.$(pkgversion)
+
+uninstall-info :
+	-install-info --remove $(DESTDIR)$(infodir)/$(pkgname).info $(DESTDIR)$(infodir)/dir
+	-rm -f $(DESTDIR)$(infodir)/$(pkgname).info
+
+dist :
+	ln -sf $(VPATH) $(DISTNAME)
+	tar -cvf $(DISTNAME).tar \
+	  $(DISTNAME)/AUTHORS \
+	  $(DISTNAME)/COPYING \
+	  $(DISTNAME)/ChangeLog \
+	  $(DISTNAME)/INSTALL \
+	  $(DISTNAME)/Makefile.in \
+	  $(DISTNAME)/NEWS \
+	  $(DISTNAME)/README \
+	  $(DISTNAME)/configure \
+	  $(DISTNAME)/doc/$(pkgname).info \
+	  $(DISTNAME)/doc/$(pkgname).texinfo \
+	  $(DISTNAME)/testsuite/COPYING.lz \
+	  $(DISTNAME)/testsuite/check.sh \
+	  $(DISTNAME)/*.h \
+	  $(DISTNAME)/*.cc
+	rm -f $(DISTNAME)
+	lzip -v -9 $(DISTNAME).tar
+
+clean :
+	-rm -f $(progname) $(progname)_profiled $(lib_objs) $(objs) *.a
+	-rm -f $(progname)_shared $(sh_lib_objs) *.so.$(pkgversion)
+
+distclean : clean
+	-rm -f Makefile config.status *.tar *.tar.lz
diff --git a/NEWS b/NEWS
new file mode 100644
index 0000000..5586409
--- /dev/null
+++ b/NEWS
@@ -0,0 +1,3 @@
+Changes in version 0.3:
+
+Lzilib is now built as a shared library (in addition to static).
diff --git a/README b/README
new file mode 100644
index 0000000..461e233
--- /dev/null
+++ b/README
@@ -0,0 +1,39 @@
+Description
+
+The lzlib compression library provides in-memory LZMA compression and
+decompression functions, including integrity checking of the
+uncompressed data. The compressed data format used by the library is the
+lzip format.
+
+The functions and variables forming the interface of the compression
+library are declared in the file lzlib.h. An usage example of the
+library is given in the file main.cc.
+
+Compression/decompression is done by repeteadly calling a couple of
+read/write functions until all the data has been processed by the
+library. This interface is safer and less error prone than the
+traditional zlib interface.
+
+Lzlib will correctly decompress a data stream which is the concatenation
+of two or more compressed data streams. The result is the concatenation
+of the corresponding uncompressed data streams. Integrity testing of
+concatenated compressed data streams is also supported.
+
+All the library functions are thread safe. The library does not install
+any signal handler. The decoder checks the consistency of the compressed
+data, so the library should never crash even in case of corrupted input.
+
+Lzlib implements a simplified version of the LZMA (Lempel-Ziv-Markov
+chain-Algorithm) algorithm. The original LZMA algorithm was designed by
+Igor Pavlov. For a description of the LZMA algorithm, see the Lzip
+manual.
+
+
+Copyright (C) 2009 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 this
+file.
diff --git a/arg_parser.cc b/arg_parser.cc
new file mode 100644
index 0000000..b889e1a
--- /dev/null
+++ b/arg_parser.cc
@@ -0,0 +1,193 @@
+/*  Arg_parser - A POSIX/GNU command line argument parser.
+    Copyright (C) 2006, 2007, 2008, 2009 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 3 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/>.
+*/
+
+#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 int 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 ) )
+      {
+      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;
+      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;
+        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< std::string > 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 ) non_options.push_back( argv[argind++] );
+      else { data.push_back( Record() ); data.back().argument = argv[argind++]; }
+      }
+    }
+  if( error_.size() ) data.clear();
+  else
+    {
+    for( unsigned int i = 0; i < non_options.size(); ++i )
+      { data.push_back( Record() ); data.back().argument.swap( non_options[i] ); }
+    while( argind < argc )
+      { data.push_back( Record() ); data.back().argument = 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() ); data.back().argument = opt; }
+  }
diff --git a/arg_parser.h b/arg_parser.h
new file mode 100644
index 0000000..fa6161b
--- /dev/null
+++ b/arg_parser.h
@@ -0,0 +1,95 @@
+/*  Arg_parser - A POSIX/GNU command line argument parser.
+    Copyright (C) 2006, 2007, 2008, 2009 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 3 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/>.
+*/
+
+/*  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;
+    Record( const int c = 0 ) : code( c ) {}
+    };
+
+  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 throw() { return error_; }
+
+      // The number of arguments parsed (may be different from argc)
+  int arguments() const throw() { 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 throw()
+    {
+    if( i >= 0 && i < arguments() ) return data[i].code;
+    else return 0;
+    }
+
+  const std::string & argument( const int i ) const throw()
+    {
+    if( i >= 0 && i < arguments() ) return data[i].argument;
+    else return error_;
+    }
+  };
diff --git a/configure b/configure
new file mode 100755
index 0000000..1301d47
--- /dev/null
+++ b/configure
@@ -0,0 +1,237 @@
+#! /bin/sh
+# configure script for Lzlib - A compression library for lzip files
+# Copyright (C) 2009 Antonio Diaz Diaz.
+#
+# This configure script is free software: you have unlimited permission
+# to copy, distribute and modify it.
+#
+# Date of this version: 2009-05-03
+
+invocation_name=$0
+args=
+no_create=
+pkgname=lzlib
+pkgversion=0.3
+soversion=0
+progname=minilzip
+progname_shared=${progname}_shared
+libname=liblz
+srctrigger=${pkgname}.h
+
+# clear some things potentially inherited from environment.
+LC_ALL=C
+export LC_ALL
+srcdir=
+prefix=/usr/local
+exec_prefix='$(prefix)'
+bindir='$(exec_prefix)/bin'
+datadir='$(prefix)/share'
+includedir='${prefix}/include'
+infodir='$(datadir)/info'
+libdir='${exec_prefix}/lib'
+mandir='$(datadir)/man'
+sysconfdir='$(prefix)/etc'
+CC=
+CXX=
+CPPFLAGS=
+CFLAGS='-Wall -W -O2'
+CXXFLAGS='-Wall -W -O2'
+LDFLAGS=
+
+# Loop over all args
+while [ x"$1" != x ] ; do
+
+	# Get the first arg, and shuffle
+	option=$1
+	shift
+
+	# Add the argument quoted to args
+	args="${args} \"${option}\""
+
+	# Split out the argument for options that take them
+	case ${option} in
+	*=*) optarg=`echo ${option} | sed -e 's,^[^=]*=,,'` ;;
+	esac
+
+	# Process the options
+	case ${option} in
+	--help | --he* | -h)
+		echo "Usage: configure [options]"
+		echo
+		echo "Options: [defaults in brackets]"
+		echo "  -h, --help            display this help and exit"
+		echo "  -V, --version         output version information and exit"
+		echo "  --srcdir=DIR          find the sources in DIR [. or ..]"
+		echo "  --prefix=DIR          install into DIR [${prefix}]"
+		echo "  --exec-prefix=DIR     base directory for arch-dependent files [${exec_prefix}]"
+		echo "  --bindir=DIR          user executables directory [${bindir}]"
+		echo "  --datadir=DIR         base directory for doc and data [${datadir}]"
+		echo "  --includedir=DIR      C header files [${includedir}]"
+		echo "  --infodir=DIR         info files directory [${infodir}]"
+		echo "  --libdir=DIR          object code libraries [${libdir}]"
+		echo "  --mandir=DIR          man pages directory [${mandir}]"
+		echo "  --sysconfdir=DIR      read-only single-machine data directory [${sysconfdir}]"
+		echo "  --disable-shared      do not build a shared library [enable]"
+		echo "  CC=COMPILER           C compiler to use [gcc]"
+		echo "  CXX=COMPILER          C++ compiler to use [g++]"
+		echo "  CPPFLAGS=OPTIONS      command line options for the preprocessor [${CPPFLAGS}]"
+		echo "  CFLAGS=OPTIONS        command line options for the C compiler [${CFLAGS}]"
+		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 | --ve* | -V)
+		echo "Configure script for ${pkgname} version ${pkgversion}"
+		exit 0 ;;
+	--srcdir* | --sr*)
+		srcdir=`echo ${optarg} | sed -e 's,/$,,'` ;;
+	--prefix* | --pr*)
+		prefix=`echo ${optarg} | sed -e 's,/$,,'` ;;
+	--exec-prefix* | --ex*)
+		exec_prefix=`echo ${optarg} | sed -e 's,/$,,'` ;;
+	--bindir* | --bi*)
+		bindir=`echo ${optarg} | sed -e 's,/$,,'` ;;
+	--datadir* | --da*)
+		datadir=`echo ${optarg} | sed -e 's,/$,,'` ;;
+	--includedir* | --inc*)
+		includedir=`echo ${optarg} | sed -e 's,/$,,'` ;;
+	--infodir* | --inf*)
+		infodir=`echo ${optarg} | sed -e 's,/$,,'` ;;
+	--libdir* | --li*)
+		libdir=`echo ${optarg} | sed -e 's,/$,,'` ;;
+	--mandir* | --ma*)
+		mandir=`echo ${optarg} | sed -e 's,/$,,'` ;;
+	--sysconfdir* | --sy*)
+		sysconfdir=`echo ${optarg} | sed -e 's,/$,,'` ;;
+	--no-create | --no-c*)
+		no_create=yes ;;
+	--disable-shared | --disable-s*)
+		progname_shared= ;;
+
+	CC=*)       CC=${optarg} ;;
+	CXX=*)      CXX=${optarg} ;;
+	CPPFLAGS=*) CPPFLAGS=${optarg} ;;
+	CFLAGS=*)   CFLAGS=${optarg} ;;
+	CXXFLAGS=*) CXXFLAGS=${optarg} ;;
+	LDFLAGS=*)  LDFLAGS=${optarg} ;;
+
+	--build=* | --enable-* | --with-* | --*dir=* | *=* | *-*-*) ;;
+	*)
+		echo "configure: Unrecognized option: \"${option}\"; use --help for usage." 1>&2
+		exit 1 ;;
+	esac
+done
+
+# Find the source files, if location was not specified.
+srcdirtext=
+if [ x"${srcdir}" = x ] ; 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 ${invocation_name} | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
+	fi
+fi
+
+if [ ! -r ${srcdir}/${srctrigger} ] ; then
+	exec 1>&2
+	echo
+	echo "configure: Can't find sources in ${srcdir} ${srcdirtext}"
+	echo "configure: (At least ${srctrigger} is missing)."
+	exit 1
+fi
+
+# Set srcdir to . if that's what it is.
+if [ "`pwd`" = "`cd ${srcdir} ; pwd`" ] ; then srcdir=. ; fi
+
+# checking whether we are using GNU C.
+if [ x"${CC}" = x ] ; then		# Let the user override the test.
+	if [ -x /bin/gcc ] ||
+	   [ -x /usr/bin/gcc ] ||
+	   [ -x /usr/local/bin/gcc ] ; then
+		CC="gcc"
+	else
+		CC="cc"
+	fi
+fi
+
+# checking whether we are using GNU C++.
+if [ x"${CXX}" = x ] ; then		# Let the user override the test.
+	if [ -x /bin/g++ ] ||
+	   [ -x /usr/bin/g++ ] ||
+	   [ -x /usr/local/bin/g++ ] ; then
+		CXX="g++"
+	else
+		CXX="c++"
+	fi
+fi
+
+echo
+if [ x${no_create} = x ] ; then
+	echo "creating config.status"
+	rm -f config.status
+	cat > config.status << EOF
+#! /bin/sh
+# This file was generated automatically by configure. Do not 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 ${invocation_name} ${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 "datadir = ${datadir}"
+echo "includedir = ${includedir}"
+echo "infodir = ${infodir}"
+echo "libdir = ${libdir}"
+echo "mandir = ${mandir}"
+echo "sysconfdir = ${sysconfdir}"
+echo "CC = ${CC}"
+echo "CXX = ${CXX}"
+echo "CPPFLAGS = ${CPPFLAGS}"
+echo "CFLAGS = ${CFLAGS}"
+echo "CXXFLAGS = ${CXXFLAGS}"
+echo "LDFLAGS = ${LDFLAGS}"
+rm -f Makefile
+cat > Makefile << EOF
+# Makefile for Lzlib - A compression library for lzip files
+# Copyright (C) 2009 Antonio Diaz Diaz.
+# This file was generated automatically by configure. Do not edit.
+#
+# This Makefile is free software: you have unlimited permission
+# to copy, distribute and modify it.
+
+pkgname = ${pkgname}
+pkgversion = ${pkgversion}
+soversion = ${soversion}
+progname = ${progname}
+progname_shared = ${progname_shared}
+libname = ${libname}
+VPATH = ${srcdir}
+prefix = ${prefix}
+exec_prefix = ${exec_prefix}
+bindir = ${bindir}
+datadir = ${datadir}
+includedir = ${includedir}
+infodir = ${infodir}
+libdir = ${libdir}
+mandir = ${mandir}
+sysconfdir = ${sysconfdir}
+CC = ${CC}
+CXX = ${CXX}
+CPPFLAGS = ${CPPFLAGS}
+CFLAGS = ${CFLAGS}
+CXXFLAGS = ${CXXFLAGS}
+LDFLAGS = ${LDFLAGS}
+EOF
+cat ${srcdir}/Makefile.in >> Makefile
+
+echo "OK. Now you can run make."
diff --git a/decoder.cc b/decoder.cc
new file mode 100644
index 0000000..aa394de
--- /dev/null
+++ b/decoder.cc
@@ -0,0 +1,207 @@
+/*  Lzlib - A compression library for lzip files
+    Copyright (C) 2009 Antonio Diaz Diaz.
+
+    This library 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 3 of the License, or
+    (at your option) any later version.
+
+    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.  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/>.
+
+    As a special exception, you may use this file as part of a free
+    software library without restriction.  Specifically, if other files
+    instantiate templates or use macros or inline functions from this
+    file, or you compile this file and link it with other files to
+    produce an executable, this file does not by itself cause the
+    resulting executable to be covered by the GNU General Public
+    License.  This exception does not however invalidate any other
+    reasons why the executable file might be covered by the GNU General
+    Public License.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <algorithm>
+#include <cerrno>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <stdint.h>
+
+#include "lzlib.h"
+#include "lzip.h"
+#include "decoder.h"
+
+
+const CRC32 crc32;
+
+
+int Circular_buffer::read_data( uint8_t * const out_buffer, const int out_size ) throw()
+  {
+  int size = 0;
+  if( get > put )
+    {
+    size = std::min( buffer_size - get, out_size );
+    if( size > 0 )
+      {
+      std::memmove( out_buffer, buffer + get, size );
+      get += size;
+      if( get >= buffer_size ) get = 0;
+      }
+    }
+  if( get < put )
+    {
+    const int size2 = std::min( put - get, out_size - size );
+    if( size2 > 0 )
+      {
+      std::memmove( out_buffer + size, buffer + get, size2 );
+      get += size2;
+      size += size2;
+      }
+    }
+  return size;
+  }
+
+
+int Circular_buffer::write_data( uint8_t * const in_buffer, const int in_size ) throw()
+  {
+  int size = 0;
+  if( put >= get )
+    {
+    size = std::min( buffer_size - put - (get == 0), in_size );
+    if( size > 0 )
+      {
+      std::memmove( buffer + put, in_buffer, size );
+      put += size;
+      if( put >= buffer_size ) put = 0;
+      }
+    }
+  if( put < get )
+    {
+    const int size2 = std::min( get - put - 1, in_size - size );
+    if( size2 > 0 )
+      {
+      std::memmove( buffer + put, in_buffer + size, size2 );
+      put += size2;
+      size += size2;
+      }
+    }
+  return size;
+  }
+
+
+bool LZ_decoder::verify_trailer()
+  {
+  bool error = false;
+  File_trailer trailer;
+  const int trailer_size = trailer.size( format_version );
+  for( int i = 0; i < trailer_size && !error; ++i )
+    {
+    if( range_decoder.finished() ) error = true;
+    ((uint8_t *)&trailer)[i] = range_decoder.get_byte();
+    }
+  if( format_version == 0 ) trailer.member_size( member_position() );
+  if( trailer.data_crc() != crc() ) error = true;
+  if( trailer.data_size() != data_position() ) error = true;
+  if( trailer.member_size() != member_position() ) error = true;
+  return !error;
+  }
+
+
+    // Return value: 0 = OK, 1 = decoder error, 2 = unexpected EOF,
+    //               3 = trailer error, 4 = unknown marker found.
+int LZ_decoder::decode_member()
+  {
+  if( member_finished_ ) return 0;
+  while( true )
+    {
+    if( range_decoder.available_bytes() <= 0 ||
+        ( !range_decoder.at_stream_end() &&
+          range_decoder.available_bytes() < min_available_bytes ) )
+      return 0;					// need more data
+    if( free_bytes() < max_match_len ) return 0;
+    if( range_decoder.finished() ) return 2;
+    const int pos_state = data_position() & pos_state_mask;
+    if( range_decoder.decode_bit( bm_match[state()][pos_state] ) == 0 )
+      {
+      if( state.is_char() )
+        prev_byte = literal_decoder.decode( range_decoder, prev_byte );
+      else
+        prev_byte = literal_decoder.decode_matched( range_decoder, prev_byte,
+                                                    get_byte( rep0 ) );
+      put_byte( prev_byte );
+      state.set_char();
+      }
+    else
+      {
+      int len;
+      if( range_decoder.decode_bit( bm_rep[state()] ) == 1 )
+        {
+        len = 0;
+        if( range_decoder.decode_bit( bm_rep0[state()] ) == 0 )
+          {
+          if( range_decoder.decode_bit( bm_len[state()][pos_state] ) == 0 )
+            { len = 1; state.set_short_rep(); }
+          }
+        else
+          {
+          unsigned int distance;
+          if( range_decoder.decode_bit( bm_rep1[state()] ) == 0 )
+            distance = rep1;
+          else
+            {
+            if( range_decoder.decode_bit( bm_rep2[state()] ) == 0 )
+              distance = rep2;
+            else { distance = rep3; rep3 = rep2; }
+            rep2 = rep1;
+            }
+          rep1 = rep0;
+          rep0 = distance;
+          }
+        if( len == 0 )
+          {
+          len = min_match_len + rep_match_len_decoder.decode( range_decoder, pos_state );
+          state.set_rep();
+          }
+        }
+      else
+        {
+        rep3 = rep2; rep2 = rep1; rep1 = rep0;
+        len = min_match_len + len_decoder.decode( range_decoder, pos_state );
+        state.set_match();
+        const int dis_slot = range_decoder.decode_tree( bm_dis_slot[get_dis_state(len)], dis_slot_bits );
+        if( dis_slot < start_dis_model ) rep0 = dis_slot;
+        else
+          {
+          const int direct_bits = ( dis_slot >> 1 ) - 1;
+          rep0 = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
+          if( dis_slot < end_dis_model )
+            rep0 += range_decoder.decode_tree_reversed( bm_dis + rep0 - dis_slot, direct_bits );
+          else
+            {
+            rep0 += range_decoder.decode( direct_bits - dis_align_bits ) << dis_align_bits;
+            rep0 += range_decoder.decode_tree_reversed( bm_align, dis_align_bits );
+            if( rep0 == 0xFFFFFFFF )		// Marker found
+              {
+              if( len == min_match_len )	// End Of Stream marker
+                {
+                member_finished_ = true;
+                if( verify_trailer() ) return 0; else return 3;
+                }
+              return 4;
+              }
+            }
+          }
+        }
+      if( !copy_block( rep0, len ) ) return 1;
+      prev_byte = get_byte( 0 );
+      }
+    }
+  }
diff --git a/decoder.h b/decoder.h
new file mode 100644
index 0000000..785f310
--- /dev/null
+++ b/decoder.h
@@ -0,0 +1,282 @@
+/*  Lzlib - A compression library for lzip files
+    Copyright (C) 2009 Antonio Diaz Diaz.
+
+    This library 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 3 of the License, or
+    (at your option) any later version.
+
+    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.  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/>.
+
+    As a special exception, you may use this file as part of a free
+    software library without restriction.  Specifically, if other files
+    instantiate templates or use macros or inline functions from this
+    file, or you compile this file and link it with other files to
+    produce an executable, this file does not by itself cause the
+    resulting executable to be covered by the GNU General Public
+    License.  This exception does not however invalidate any other
+    reasons why the executable file might be covered by the GNU General
+    Public License.
+*/
+
+const int min_available_bytes = 8 + sizeof( File_trailer );
+
+class Input_buffer : public Circular_buffer
+  {
+  bool at_stream_end_;
+
+public:
+  Input_buffer()
+    :
+    Circular_buffer( 65536 + min_available_bytes ),
+    at_stream_end_( false ) {}
+
+  bool at_stream_end() const throw() { return at_stream_end_; }
+  void finish() throw() { at_stream_end_ = true; }
+  bool finished() const throw() { return at_stream_end_ && !used_bytes(); }
+  void purge() throw() { at_stream_end_ = true; Circular_buffer::reset(); }
+
+  int write_data( uint8_t * const in_buffer, const int in_size ) throw()
+    {
+    if( at_stream_end_ || in_size <= 0 ) return 0;
+    return Circular_buffer::write_data( in_buffer, in_size );
+    }
+  };
+
+
+class Range_decoder
+  {
+  mutable long long member_pos;
+  uint32_t code;
+  uint32_t range;
+  Input_buffer & ibuf;
+
+public:
+  Range_decoder( const int header_size, Input_buffer & buf )
+    :
+    member_pos( header_size ),
+    code( 0 ),
+    range( 0xFFFFFFFF ),
+    ibuf( buf )
+    { for( int i = 0; i < 5; ++i ) code = (code << 8) | get_byte(); }
+
+  uint8_t get_byte() const
+    {
+    ++member_pos;
+    return ibuf.get_byte();
+    }
+
+  bool at_stream_end() const throw() { return ibuf.at_stream_end(); }
+  int available_bytes() const throw() { return ibuf.used_bytes(); }
+  bool finished() const throw() { return ibuf.finished(); }
+  long long member_position() const throw() { return member_pos; }
+
+  int decode( const int num_bits )
+    {
+    int symbol = 0;
+    for( int i = num_bits - 1; i >= 0; --i )
+      {
+      range >>= 1;
+      symbol <<= 1;
+      if( code >= range )
+        { code -= range; symbol |= 1; }
+      if( range <= 0x00FFFFFF )
+        { range <<= 8; code = (code << 8) | get_byte(); }
+      }
+    return symbol;
+    }
+
+  int decode_bit( Bit_model & bm )
+    {
+    int symbol;
+    const uint32_t bound = ( range >> bit_model_total_bits ) * bm.probability;
+    if( code < bound )
+      {
+      range = bound;
+      bm.probability += (bit_model_total - bm.probability) >> bit_model_move_bits;
+      symbol = 0;
+      }
+    else
+      {
+      range -= bound;
+      code -= bound;
+      bm.probability -= bm.probability >> bit_model_move_bits;
+      symbol = 1;
+      }
+    if( range <= 0x00FFFFFF )
+      { range <<= 8; code = (code << 8) | get_byte(); }
+    return symbol;
+    }
+
+  int decode_tree( Bit_model bm[], const int num_bits )
+    {
+    int model = 1;
+    for( int i = num_bits; i > 0; --i )
+      model = ( model << 1 ) | decode_bit( bm[model-1] );
+    return model - (1 << num_bits);
+    }
+
+  int decode_tree_reversed( Bit_model bm[], const int num_bits )
+    {
+    int model = 1;
+    int symbol = 0;
+    for( int i = 1; i < (1 << num_bits); i <<= 1 )
+      {
+      const int bit = decode_bit( bm[model-1] );
+      model = ( model << 1 ) | bit;
+      if( bit ) symbol |= i;
+      }
+    return symbol;
+    }
+
+  int decode_matched( Bit_model bm[], const int match_byte )
+    {
+    int symbol = 1;
+    for( int i = 7; i >= 0; --i )
+      {
+      const int match_bit = ( match_byte >> i ) & 1;
+      const int bit = decode_bit( bm[(match_bit<<8)+symbol+0xFF] );
+      symbol = ( symbol << 1 ) | bit;
+      if( match_bit != bit ) break;
+      }
+    while( symbol < 0x100 )
+      symbol = ( symbol << 1 ) | decode_bit( bm[symbol-1] );
+    return symbol & 0xFF;
+    }
+  };
+
+
+class Len_decoder
+  {
+  Bit_model choice1;
+  Bit_model choice2;
+  Bit_model bm_low[pos_states][len_low_symbols];
+  Bit_model bm_mid[pos_states][len_mid_symbols];
+  Bit_model bm_high[len_high_symbols];
+
+public:
+  int decode( Range_decoder & range_decoder, const int pos_state )
+    {
+    if( range_decoder.decode_bit( choice1 ) == 0 )
+      return range_decoder.decode_tree( bm_low[pos_state], len_low_bits );
+    if( range_decoder.decode_bit( choice2 ) == 0 )
+      return len_low_symbols +
+             range_decoder.decode_tree( bm_mid[pos_state], len_mid_bits );
+    return len_low_symbols + len_mid_symbols +
+           range_decoder.decode_tree( bm_high, len_high_bits );
+    }
+  };
+
+
+class Literal_decoder
+  {
+  Bit_model bm_literal[1<<literal_context_bits][0x300];
+
+  int state( const int prev_byte ) const throw()
+    { return ( prev_byte >> ( 8 - literal_context_bits ) ); }
+
+public:
+  uint8_t decode( Range_decoder & range_decoder, const int prev_byte )
+    { return range_decoder.decode_tree( bm_literal[state(prev_byte)], 8 ); }
+
+  uint8_t decode_matched( Range_decoder & range_decoder,
+                          const int prev_byte, const int match_byte )
+    { return range_decoder.decode_matched( bm_literal[state(prev_byte)], match_byte ); }
+  };
+
+
+class LZ_decoder : public Circular_buffer
+  {
+  long long partial_data_pos;
+  const int format_version;
+  const int dictionary_size;
+  uint32_t crc_;
+  bool member_finished_;
+  unsigned int rep0;
+  unsigned int rep1;
+  unsigned int rep2;
+  unsigned int rep3;
+  State state;
+  uint8_t prev_byte;
+
+  Bit_model bm_match[State::states][pos_states];
+  Bit_model bm_rep[State::states];
+  Bit_model bm_rep0[State::states];
+  Bit_model bm_rep1[State::states];
+  Bit_model bm_rep2[State::states];
+  Bit_model bm_len[State::states][pos_states];
+  Bit_model bm_dis_slot[max_dis_states][1<<dis_slot_bits];
+  Bit_model bm_dis[modeled_distances-end_dis_model];
+  Bit_model bm_align[dis_align_size];
+
+  Range_decoder range_decoder;
+  Len_decoder len_decoder;
+  Len_decoder rep_match_len_decoder;
+  Literal_decoder literal_decoder;
+
+//  using Circular_buffer::get_byte;
+  uint8_t get_byte( const int distance ) const throw()
+    {
+    int i = put - distance - 1;
+    if( i < 0 ) i += buffer_size;
+    return buffer[i];
+    }
+
+  void put_byte( const uint8_t b )
+    {
+    crc32.update( crc_, b );
+    buffer[put] = b;
+    if( ++put >= buffer_size ) { partial_data_pos += put; put = 0; }
+    }
+
+  bool copy_block( const int distance, int len )
+    {
+    if( distance < 0 || distance >= dictionary_size ||
+        len <= 0 || len > max_match_len ) return false;
+    int i = put - distance - 1;
+    if( i < 0 ) i += buffer_size;
+    for( ; len > 0 ; --len )
+      {
+      crc32.update( crc_, buffer[i] );
+      buffer[put] = buffer[i];
+      if( ++put >= buffer_size ) { partial_data_pos += put; put = 0; }
+      if( ++i >= buffer_size ) i = 0;
+      }
+    return true;
+    }
+
+  bool verify_trailer();
+
+public:
+  LZ_decoder( const File_header & header, Input_buffer & ibuf )
+    :
+    Circular_buffer( std::max( 65536, header.dictionary_size() ) + max_match_len ),
+    partial_data_pos( 0 ),
+    format_version( header.version ),
+    dictionary_size( header.dictionary_size() ),
+    crc_( 0xFFFFFFFF ),
+    member_finished_( false ),
+    rep0( 0 ),
+    rep1( 0 ),
+    rep2( 0 ),
+    rep3( 0 ),
+    prev_byte( 0 ),
+    range_decoder( sizeof header, ibuf ),
+    literal_decoder() {}
+
+  uint32_t crc() const throw() { return crc_ ^ 0xFFFFFFFF; }
+  int decode_member();
+  bool member_finished() const throw()
+    { return ( member_finished_ && !used_bytes() ); }
+
+  long long member_position() const throw()
+    { return range_decoder.member_position(); }
+  long long data_position() const throw()
+    { return partial_data_pos + put; }
+  };
diff --git a/doc/lzlib.info b/doc/lzlib.info
new file mode 100644
index 0000000..28aea4d
--- /dev/null
+++ b/doc/lzlib.info
@@ -0,0 +1,487 @@
+This is lzlib.info, produced by makeinfo version 4.13 from
+lzlib.texinfo.
+
+INFO-DIR-SECTION Data Compression
+START-INFO-DIR-ENTRY
+* Lzlib: (lzlib).               A compression library for lzip files
+END-INFO-DIR-ENTRY
+
+
+File: lzlib.info,  Node: Top,  Next: Introduction,  Up: (dir)
+
+Lzlib
+*****
+
+This manual is for Lzlib (version 0.3, 3 May 2009).
+
+* Menu:
+
+* Introduction::		Purpose and features of Lzlib
+* Library Version::		Checking library version
+* Compression Functions::	Descriptions of the compression functions
+* Decompression Functions::	Descriptions of the decompression functions
+* Error Codes::			Meaning of codes returned by functions
+* Data Format::			Detailed format of the compressed data
+* Examples::			A small tutorial with examples
+* Problems::			Reporting bugs
+* Concept Index::		Index of concepts
+
+
+   Copyright (C) 2009 Antonio Diaz Diaz.
+
+   This manual is free documentation: you have unlimited permission to
+copy, distribute and modify it.
+
+
+File: lzlib.info,  Node: Introduction,  Next: Library Version,  Prev: Top,  Up: Top
+
+1 Introduction
+**************
+
+The lzlib compression library provides in-memory LZMA compression and
+decompression functions, including integrity checking of the
+uncompressed data. The compressed data format used by the library is the
+lzip format.
+
+   The functions and variables forming the interface of the compression
+library are declared in the file `lzlib.h'. An usage example of the
+library is given in the file main.cc.
+
+   Compression/decompression is done by repeteadly calling a couple of
+read/write functions until all the data has been processed by the
+library. This interface is safer and less error prone than the
+traditional zlib interface.
+
+   Lzlib will correctly decompress a data stream which is the
+concatenation of two or more compressed data streams. The result is the
+concatenation of the corresponding uncompressed data streams. Integrity
+testing of concatenated compressed data streams is also supported.
+
+   All the library functions are thread safe. The library does not
+install any signal handler. The decoder checks the consistency of the
+compressed data, so the library should never crash even in case of
+corrupted input.
+
+   Lzlib implements a simplified version of the LZMA (Lempel-Ziv-Markov
+chain-Algorithm) algorithm. The original LZMA algorithm was designed by
+Igor Pavlov. For a description of the LZMA algorithm, see the Lzip
+manual.
+
+
+File: lzlib.info,  Node: Library Version,  Next: Compression Functions,  Prev: Introduction,  Up: Top
+
+2 Library Version
+*****************
+
+ -- Function: const char * LZ_version ( void )
+     Returns the library version as a string.
+
+ -- Constant: const char * LZ_version_string
+     This constant is defined in the header file `lzlib.h'.
+
+   The application should compare LZ_version and LZ_version_string for
+consistency. If the first character differs, the library code actually
+used may be incompatible with the `lzlib.h' header file used by the
+application.
+
+     if( LZ_version()[0] != LZ_version_string[0] )
+       error( "bad library version" );
+
+
+File: lzlib.info,  Node: Compression Functions,  Next: Decompression Functions,  Prev: Library Version,  Up: Top
+
+3 Compression Functions
+***********************
+
+These are the functions used to compress data. In case of error, all of
+them return -1, except `LZ_compress_open' whose return value must be
+verified by calling `LZ_compress_errno' before using it.
+
+ -- Function: void * LZ_compress_open ( const int DICTIONARY_SIZE,
+          const int MATCH_LEN_LIMIT, const long long MEMBER_SIZE )
+     Initializes the internal stream state for compression and returns a
+     pointer that can only be used as the ENCODER argument for the
+     other LZ_compress functions.
+
+     The returned pointer must be verified by calling
+     `LZ_compress_errno' before using it. If `LZ_compress_errno' does
+     not return `LZ_ok', the returned pointer must not be used and
+     should be freed with `LZ_compress_close' to avoid memory leaks.
+
+     DICTIONARY_SIZE sets the dictionary size to be used, in bytes.
+     Valid values range from 4KiB to 512MiB. Note that dictionary sizes
+     are quantized. If the specified size does not match one of the
+     valid sizes, it will be rounded upwards.
+
+     MATCH_LEN_LIMIT sets the match length limit in bytes. Valid values
+     range from 5 to 273. Larger values usually give better compression
+     ratios but longer compression times.
+
+     MEMBER_SIZE sets the member size limit in bytes. Minimum member
+     size limit is 100kB. Small member size may degrade compression
+     ratio, so use it only when needed. To produce a single member data
+     stream, give MEMBER_SIZE a value larger than the amount of data to
+     be produced, for example LLONG_MAX.
+
+ -- Function: int LZ_compress_close ( void * const ENCODER )
+     Frees all dynamically allocated data structures for this stream.
+     This function discards any unprocessed input and does not flush
+     any pending output. After a call to `LZ_compress_close', ENCODER
+     can no more be used as an argument to any LZ_compress function.
+
+ -- Function: int LZ_compress_finish ( void * const ENCODER )
+     Use this function to tell `lzlib' that all the data for this stream
+     has already been written (with the `LZ_compress_write' function).
+
+ -- Function: int LZ_compress_finish_member ( void * const ENCODER )
+     Use this function to tell `lzlib' that all the data for the current
+     member, in a multimember data stream, has already been written
+     (with the `LZ_compress_write' function).
+
+ -- Function: int LZ_compress_restart_member ( void * const ENCODER,
+          const long long MEMBER_SIZE )
+     Use this function to start a new member, in a multimember data
+     stream.  Call this function only after
+     `LZ_compress_member_finished' indicates that the current member
+     has been fully read (with the `LZ_compress_read' function).
+
+ -- Function: int LZ_compress_read ( void * const ENCODER, uint8_t *
+          const BUFFER, const int SIZE )
+     The `LZ_compress_read' function reads up to SIZE bytes from the
+     stream pointed to by ENCODER, storing the results in BUFFER.
+
+     The return value is the number of bytes actually read. This might
+     be less than SIZE; for example, if there aren't that many bytes
+     left in the stream or if more bytes have to be yet written with the
+     `LZ_compress_write' function. Note that reading less than SIZE
+     bytes is not an error.
+
+ -- Function: int LZ_compress_write ( void * const ENCODER, uint8_t *
+          const BUFFER, const int SIZE )
+     The `LZ_compress_write' function writes up to SIZE bytes from
+     BUFFER to the stream pointed to by ENCODER.
+
+     The return value is the number of bytes actually written. This
+     might be less than SIZE. Note that writing less than SIZE bytes is
+     not an error.
+
+ -- Function: enum LZ_errno LZ_compress_errno ( void * const ENCODER )
+     Returns the current error code for ENCODER (*note Error Codes::)
+
+ -- Function: int LZ_compress_finished ( void * const ENCODER )
+     Returns 1 if all the data has been read and `LZ_compress_close' can
+     be safely called. Otherwise it returns 0.
+
+ -- Function: int LZ_compress_member_finished ( void * const ENCODER )
+     Returns 1 if the current member, in a multimember data stream, has
+     been fully read and `LZ_compress_restart_member' can be safely
+     called.  Otherwise it returns 0.
+
+ -- Function: long long LZ_compress_data_position ( void * const
+          ENCODER )
+     Returns the number of input bytes already compressed in the current
+     member.
+
+ -- Function: long long LZ_compress_member_position ( void * const
+          ENCODER )
+     Returns the number of compressed bytes already produced, but
+     perhaps not yet read, in the current member.
+
+ -- Function: long long LZ_compress_total_in_size ( void * const
+          ENCODER )
+     Returns the total number of input bytes already compressed.
+
+ -- Function: long long LZ_compress_total_out_size ( void * const
+          ENCODER )
+     Returns the total number of compressed bytes already produced, but
+     perhaps not yet read.
+
+
+File: lzlib.info,  Node: Decompression Functions,  Next: Error Codes,  Prev: Compression Functions,  Up: Top
+
+4 Decompression Functions
+*************************
+
+These are the functions used to decompress data. In case of error, all
+of them return -1, except `LZ_decompress_open' whose return value must
+be verified by calling `LZ_decompress_errno' before using it.
+
+ -- Function: void * LZ_decompress_open ( void )
+     Initializes the internal stream state for decompression and
+     returns a pointer that can only be used as the DECODER argument
+     for the other LZ_decompress functions.
+
+     The returned pointer must be verified by calling
+     `LZ_decompress_errno' before using it. If `LZ_decompress_errno'
+     does not return `LZ_ok', the returned pointer must not be used and
+     should be freed with `LZ_decompress_close' to avoid memory leaks.
+
+ -- Function: int LZ_decompress_close ( void * const DECODER )
+     Frees all dynamically allocated data structures for this stream.
+     This function discards any unprocessed input and does not flush
+     any pending output. After a call to `LZ_decompress_close', DECODER
+     can no more be used as an argument to any LZ_decompress function.
+
+ -- Function: int LZ_decompress_finish ( void * const DECODER )
+     Use this function to tell `lzlib' that all the data for this stream
+     has already been written (with the `LZ_decompress_write' function).
+
+ -- Function: int LZ_decompress_read ( void * const DECODER, uint8_t *
+          const BUFFER, const int SIZE )
+     The `LZ_decompress_read' function reads up to SIZE bytes from the
+     stream pointed to by DECODER, storing the results in BUFFER.
+
+     The return value is the number of bytes actually read. This might
+     be less than SIZE; for example, if there aren't that many bytes
+     left in the stream or if more bytes have to be yet written with the
+     `LZ_decompress_write' function. Note that reading less than SIZE
+     bytes is not an error.
+
+ -- Function: int LZ_decompress_write ( void * const DECODER, uint8_t *
+          const BUFFER, const int SIZE )
+     The `LZ_decompress_write' function writes up to SIZE bytes from
+     BUFFER to the stream pointed to by DECODER.
+
+     The return value is the number of bytes actually written. This
+     might be less than SIZE. Note that writing less than SIZE bytes is
+     not an error.
+
+ -- Function: enum LZ_errno LZ_decompress_errno ( void * const DECODER )
+     Returns the current error code for DECODER (*note Error Codes::)
+
+ -- Function: int LZ_decompress_finished ( void * const DECODER )
+     Returns 1 if all the data has been read and `LZ_decompress_close'
+     can be safely called. Otherwise it returns 0.
+
+ -- Function: long long LZ_decompress_data_position ( void * const
+          DECODER )
+     Returns the number of decompressed bytes already produced, but
+     perhaps not yet read, in the current member.
+
+ -- Function: long long LZ_decompress_member_position ( void * const
+          DECODER )
+     Returns the number of input bytes already decompressed in the
+     current member.
+
+ -- Function: long long LZ_decompress_total_in_size ( void * const
+          DECODER )
+     Returns the total number of input bytes already decompressed.
+
+ -- Function: long long LZ_decompress_total_out_size ( void * const
+          DECODER )
+     Returns the total number of decompressed bytes already produced,
+     but perhaps not yet read.
+
+
+File: lzlib.info,  Node: Error Codes,  Next: Data Format,  Prev: Decompression Functions,  Up: Top
+
+5 Error Codes
+*************
+
+Most library functions return -1 to indicate that they have failed. But
+this return value only tells you that an error has occurred. To find out
+what kind of error it was, you need to verify the error code by calling
+`LZ_(de)compress_errno'.
+
+   Library functions do not change the value returned by
+`LZ_(de)compress_errno' when they succeed; thus, the value returned by
+`LZ_(de)compress_errno' after a successful call is not necessarily
+zero, and you should not use `LZ_(de)compress_errno' to determine
+whether a call failed. If the call failed, then you can examine
+`LZ_(de)compress_errno'.
+
+   The error codes are defined in the header file `lzlib.h'.
+
+ -- Constant: enum LZ_errno LZ_ok
+     The value of this constant is 0 and is used to indicate that there
+     is no error.
+
+ -- Constant: enum LZ_errno LZ_bad_argument
+     At least one of the arguments passed to the library function was
+     invalid.
+
+ -- Constant: enum LZ_errno LZ_mem_error
+     No memory available. The system cannot allocate more virtual memory
+     because its capacity is full.
+
+ -- Constant: enum LZ_errno LZ_sequence_error
+     A library function was called in the wrong order. For example
+     `LZ_compress_restart_member' was called before
+     `LZ_compress_member_finished' indicates that the current member is
+     finished.
+
+ -- Constant: enum LZ_errno LZ_header_error
+     Reading of member header failed. If this happens at the end of the
+     data stream it may indicate trailing garbage.
+
+ -- Constant: enum LZ_errno LZ_unexpected_eof
+     The end of the data stream was reached in the middle of a member.
+
+ -- Constant: enum LZ_errno LZ_data_error
+     The data stream is corrupt.
+
+ -- Constant: enum LZ_errno LZ_library_error
+     A bug was detected in the library. Please, report it (*note
+     Problems::).
+
+
+File: lzlib.info,  Node: Data Format,  Next: Examples,  Prev: Error Codes,  Up: Top
+
+6 Data Format
+*************
+
+In the diagram below, a box like this:
++---+
+|   | <-- the vertical bars might be missing
++---+
+
+   represents one byte; a box like this:
++==============+
+|              |
++==============+
+
+   represents a variable number of bytes.
+
+
+   A lzip data stream consists of a series of "members" (compressed data
+sets). The members simply appear one after another in the data stream,
+with no additional information before, between, or after them.
+
+   Each member has the following structure:
++--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+| ID string | VN | DS | Lzma stream | CRC32 |   Data size   |  Member size  |
++--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+   All multibyte values are stored in little endian order.
+
+`ID string'
+     A four byte string, identifying the member type, with the value
+     "LZIP".
+
+`VN (version number, 1 byte)'
+     Just in case something needs to be modified in the future. Valid
+     values are 0 and 1. Version 0 files have only one member and lack
+     `Member size'.
+
+`DS (coded dictionary size, 1 byte)'
+     Bits 4-0 contain the base 2 logarithm of the base dictionary size.
+     Bits 7-5 contain the number of "wedges" to substract from the base
+     dictionary size to obtain the dictionary size. The size of a wedge
+     is (base dictionary size / 16).
+     Valid values for dictionary size range from 4KiB to 512MiB.
+
+`Lzma stream'
+     The lzma stream, finished by an end of stream marker. Uses default
+     values for encoder properties.
+
+`CRC32 (4 bytes)'
+     CRC of the uncompressed original data.
+
+`Data size (8 bytes)'
+     Size of the uncompressed original data.
+
+`Member size (8 bytes)'
+     Total size of the member, including header and trailer. This
+     facilitates safe recovery of undamaged members from multimember
+     files.
+
+
+
+File: lzlib.info,  Node: Examples,  Next: Problems,  Prev: Data Format,  Up: Top
+
+7 A small tutorial with examples
+********************************
+
+This chaper shows the order in which the library functions should be
+called depending on what kind of data stream you want to compress or
+decompress.
+
+
+Example 1: Normal compression (MEMBER_SIZE > total output).
+
+     1) LZ_compress_open
+     2) LZ_compress_write
+     3) LZ_compress_read
+     4) go back to step 2 until all input data has been written
+     5) LZ_compress_finish
+     6) LZ_compress_read
+     7) go back to step 6 until LZ_compress_read returns 0
+     8) LZ_compress_close
+
+
+Example 2: Decompression.
+
+     1) LZ_decompress_open
+     2) LZ_decompress_write
+     3) LZ_decompress_read
+     4) go back to step 2 until all input data has been written
+     5) LZ_decompress_finish
+     6) LZ_decompress_read
+     7) go back to step 6 until LZ_decompress_read returns 0
+     8) LZ_decompress_close
+
+
+Example 3: Multimember compression (MEMBER_SIZE < total output).
+
+      1) LZ_compress_open
+      2) LZ_compress_write
+      3) LZ_compress_read
+      4) go back to step 2 until LZ_compress_member_finished returns 1
+      5) LZ_compress_restart_member
+      6) go back to step 2 until all input data has been written
+      7) LZ_compress_finish
+      8) LZ_compress_read
+      9) go back to step 8 until LZ_compress_read returns 0
+     10) LZ_compress_close
+
+
+File: lzlib.info,  Node: Problems,  Next: Concept Index,  Prev: Examples,  Up: Top
+
+8 Reporting Bugs
+****************
+
+There are probably bugs in Lzlib. 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 Lzlib, please send electronic mail to
+<lzip-bug@nongnu.org>. Include the version number, which you can find
+by running `minilzip --version' or in `LZ_version_string' from
+`lzlib.h'.
+
+
+File: lzlib.info,  Node: Concept Index,  Prev: Problems,  Up: Top
+
+Concept Index
+*************
+
+
+* Menu:
+
+* bugs:                                  Problems.              (line 6)
+* compression functions:                 Compression Functions. (line 6)
+* data format:                           Data Format.           (line 6)
+* decompression functions:               Decompression Functions.
+                                                                (line 6)
+* error codes:                           Error Codes.           (line 6)
+* examples:                              Examples.              (line 6)
+* getting help:                          Problems.              (line 6)
+* introduction:                          Introduction.          (line 6)
+* library version:                       Library Version.       (line 6)
+
+
+
+Tag Table:
+Node: Top219
+Node: Introduction968
+Node: Library Version2428
+Node: Compression Functions3085
+Node: Decompression Functions8178
+Node: Error Codes11616
+Node: Data Format13551
+Node: Examples15518
+Node: Problems16940
+Node: Concept Index17510
+
+End Tag Table
diff --git a/doc/lzlib.texinfo b/doc/lzlib.texinfo
new file mode 100644
index 0000000..69d96d4
--- /dev/null
+++ b/doc/lzlib.texinfo
@@ -0,0 +1,535 @@
+\input texinfo @c -*-texinfo-*-
+@c %**start of header
+@setfilename lzlib.info
+@settitle Lzlib
+@finalout
+@c %**end of header
+
+@set UPDATED 3 May 2009
+@set VERSION 0.3
+
+@dircategory Data Compression
+@direntry
+* Lzlib: (lzlib).               A compression library for lzip files
+@end direntry
+
+
+@titlepage
+@title Lzlib
+@subtitle A compression library for lzip files
+@subtitle for Lzlib version @value{VERSION}, @value{UPDATED}
+@author by Antonio Diaz Diaz
+
+@page
+@vskip 0pt plus 1filll
+@end titlepage
+
+@contents
+
+@node Top
+@top
+
+This manual is for Lzlib (version @value{VERSION}, @value{UPDATED}).
+
+@menu
+* Introduction::		Purpose and features of Lzlib
+* Library Version::		Checking library version
+* Compression Functions::	Descriptions of the compression functions
+* Decompression Functions::	Descriptions of the decompression functions
+* Error Codes::			Meaning of codes returned by functions
+* Data Format::			Detailed format of the compressed data
+* Examples::			A small tutorial with examples
+* Problems::			Reporting bugs
+* Concept Index::		Index of concepts
+@end menu
+
+@sp 1
+Copyright @copyright{} 2009 Antonio Diaz Diaz.
+
+This manual is free documentation: you have unlimited permission
+to copy, distribute and modify it.
+
+
+@node Introduction
+@chapter Introduction
+@cindex introduction
+
+The lzlib compression library provides in-memory LZMA compression and
+decompression functions, including integrity checking of the
+uncompressed data. The compressed data format used by the library is the
+lzip format.
+
+The functions and variables forming the interface of the compression
+library are declared in the file @samp{lzlib.h}. An usage example of the
+library is given in the file main.cc.
+
+Compression/decompression is done by repeteadly calling a couple of
+read/write functions until all the data has been processed by the
+library. This interface is safer and less error prone than the
+traditional zlib interface.
+
+Lzlib will correctly decompress a data stream which is the concatenation
+of two or more compressed data streams. The result is the concatenation
+of the corresponding uncompressed data streams. Integrity testing of
+concatenated compressed data streams is also supported.
+
+All the library functions are thread safe. The library does not install
+any signal handler. The decoder checks the consistency of the compressed
+data, so the library should never crash even in case of corrupted input.
+
+Lzlib implements a simplified version of the LZMA (Lempel-Ziv-Markov
+chain-Algorithm) algorithm. The original LZMA algorithm was designed by
+Igor Pavlov. For a description of the LZMA algorithm, see the Lzip
+manual.
+
+
+@node Library Version
+@chapter Library Version
+@cindex library version
+
+@deftypefun {const char *} LZ_version ( void )
+Returns the library version as a string.
+@end deftypefun
+
+@deftypevr Constant {const char *} LZ_version_string
+This constant is defined in the header file @samp{lzlib.h}.
+@end deftypevr
+
+The application should compare LZ_version and LZ_version_string for
+consistency. If the first character differs, the library code actually
+used may be incompatible with the @samp{lzlib.h} header file used by the
+application.
+
+@example
+if( LZ_version()[0] != LZ_version_string[0] )
+  error( "bad library version" );
+@end example
+
+
+@node Compression Functions
+@chapter Compression Functions
+@cindex compression functions
+
+These are the functions used to compress data. In case of error, all of
+them return -1, except @samp{LZ_compress_open} whose return value must
+be verified by calling @samp{LZ_compress_errno} before using it.
+
+
+@deftypefun {void *} LZ_compress_open ( const int @var{dictionary_size}, const int @var{match_len_limit}, const long long @var{member_size} )
+Initializes the internal stream state for compression and returns a
+pointer that can only be used as the @var{encoder} argument for the
+other LZ_compress functions.
+
+The returned pointer must be verified by calling
+@samp{LZ_compress_errno} before using it. If @samp{LZ_compress_errno}
+does not return @samp{LZ_ok}, the returned pointer must not be used and
+should be freed with @samp{LZ_compress_close} to avoid memory leaks.
+
+@var{dictionary_size} sets the dictionary size to be used, in bytes.
+Valid values range from 4KiB to 512MiB. Note that dictionary sizes are
+quantized. If the specified size does not match one of the valid sizes,
+it will be rounded upwards.
+
+@var{match_len_limit} sets the match length limit in bytes. Valid values
+range from 5 to 273. Larger values usually give better compression
+ratios but longer compression times.
+
+@var{member_size} sets the member size limit in bytes. Minimum member
+size limit is 100kB. Small member size may degrade compression ratio, so
+use it only when needed. To produce a single member data stream, give
+@var{member_size} a value larger than the amount of data to be produced,
+for example LLONG_MAX.
+@end deftypefun
+
+
+@deftypefun int LZ_compress_close ( void * const @var{encoder} )
+Frees all dynamically allocated data structures for this stream. This
+function discards any unprocessed input and does not flush any pending
+output. After a call to @samp{LZ_compress_close}, @var{encoder} can no
+more be used as an argument to any LZ_compress function.
+@end deftypefun
+
+
+@deftypefun int LZ_compress_finish ( void * const @var{encoder} )
+Use this function to tell @samp{lzlib} that all the data for this stream
+has already been written (with the @samp{LZ_compress_write} function).
+@end deftypefun
+
+
+@deftypefun int LZ_compress_finish_member ( void * const @var{encoder} )
+Use this function to tell @samp{lzlib} that all the data for the current
+member, in a multimember data stream, has already been written (with the
+@samp{LZ_compress_write} function).
+@end deftypefun
+
+
+@deftypefun int LZ_compress_restart_member ( void * const @var{encoder}, const long long @var{member_size} )
+Use this function to start a new member, in a multimember data stream.
+Call this function only after @samp{LZ_compress_member_finished}
+indicates that the current member has been fully read (with the
+@samp{LZ_compress_read} function).
+@end deftypefun
+
+
+@deftypefun int LZ_compress_read ( void * const @var{encoder}, uint8_t * const @var{buffer}, const int @var{size} )
+The @samp{LZ_compress_read} function reads up to @var{size} bytes from
+the stream pointed to by @var{encoder}, storing the results in
+@var{buffer}.
+
+The return value is the number of bytes actually read. This might be
+less than @var{size}; for example, if there aren't that many bytes left
+in the stream or if more bytes have to be yet written with the
+@samp{LZ_compress_write} function. Note that reading less than
+@var{size} bytes is not an error.
+@end deftypefun
+
+
+@deftypefun int LZ_compress_write ( void * const @var{encoder}, uint8_t * const @var{buffer}, const int @var{size} )
+The @samp{LZ_compress_write} function writes up to @var{size} bytes from
+@var{buffer} to the stream pointed to by @var{encoder}.
+
+The return value is the number of bytes actually written. This might be
+less than @var{size}. Note that writing less than @var{size} bytes is
+not an error.
+@end deftypefun
+
+
+@deftypefun {enum LZ_errno} LZ_compress_errno ( void * const @var{encoder} )
+Returns the current error code for @var{encoder} (@pxref{Error Codes})
+@end deftypefun
+
+
+@deftypefun int LZ_compress_finished ( void * const @var{encoder} )
+Returns 1 if all the data has been read and @samp{LZ_compress_close} can
+be safely called. Otherwise it returns 0.
+@end deftypefun
+
+
+@deftypefun int LZ_compress_member_finished ( void * const @var{encoder} )
+Returns 1 if the current member, in a multimember data stream, has been
+fully read and @samp{LZ_compress_restart_member} can be safely called.
+Otherwise it returns 0.
+@end deftypefun
+
+
+@deftypefun {long long} LZ_compress_data_position ( void * const @var{encoder} )
+Returns the number of input bytes already compressed in the current
+member.
+@end deftypefun
+
+
+@deftypefun {long long} LZ_compress_member_position ( void * const @var{encoder} )
+Returns the number of compressed bytes already produced, but perhaps not
+yet read, in the current member.
+@end deftypefun
+
+
+@deftypefun {long long} LZ_compress_total_in_size ( void * const @var{encoder} )
+Returns the total number of input bytes already compressed.
+@end deftypefun
+
+
+@deftypefun {long long} LZ_compress_total_out_size ( void * const @var{encoder} )
+Returns the total number of compressed bytes already produced, but
+perhaps not yet read.
+@end deftypefun
+
+
+@node Decompression Functions
+@chapter Decompression Functions
+@cindex decompression functions
+
+These are the functions used to decompress data. In case of error, all
+of them return -1, except @samp{LZ_decompress_open} whose return value
+must be verified by calling @samp{LZ_decompress_errno} before using it.
+
+
+@deftypefun {void *} LZ_decompress_open ( void )
+Initializes the internal stream state for decompression and returns a
+pointer that can only be used as the @var{decoder} argument for the
+other LZ_decompress functions.
+
+The returned pointer must be verified by calling
+@samp{LZ_decompress_errno} before using it. If
+@samp{LZ_decompress_errno} does not return @samp{LZ_ok}, the returned
+pointer must not be used and should be freed with
+@samp{LZ_decompress_close} to avoid memory leaks.
+@end deftypefun
+
+
+@deftypefun int LZ_decompress_close ( void * const @var{decoder} )
+Frees all dynamically allocated data structures for this stream. This
+function discards any unprocessed input and does not flush any pending
+output. After a call to @samp{LZ_decompress_close}, @var{decoder} can no
+more be used as an argument to any LZ_decompress function.
+@end deftypefun
+
+
+@deftypefun int LZ_decompress_finish ( void * const @var{decoder} )
+Use this function to tell @samp{lzlib} that all the data for this stream
+has already been written (with the @samp{LZ_decompress_write} function).
+@end deftypefun
+
+
+@deftypefun int LZ_decompress_read ( void * const @var{decoder}, uint8_t * const @var{buffer}, const int @var{size} )
+The @samp{LZ_decompress_read} function reads up to @var{size} bytes from
+the stream pointed to by @var{decoder}, storing the results in
+@var{buffer}.
+
+The return value is the number of bytes actually read. This might be
+less than @var{size}; for example, if there aren't that many bytes left
+in the stream or if more bytes have to be yet written with the
+@samp{LZ_decompress_write} function. Note that reading less than
+@var{size} bytes is not an error.
+@end deftypefun
+
+
+@deftypefun int LZ_decompress_write ( void * const @var{decoder}, uint8_t * const @var{buffer}, const int @var{size} )
+The @samp{LZ_decompress_write} function writes up to @var{size} bytes from
+@var{buffer} to the stream pointed to by @var{decoder}.
+
+The return value is the number of bytes actually written. This might be
+less than @var{size}. Note that writing less than @var{size} bytes is
+not an error.
+@end deftypefun
+
+
+@deftypefun {enum LZ_errno} LZ_decompress_errno ( void * const @var{decoder} )
+Returns the current error code for @var{decoder} (@pxref{Error Codes})
+@end deftypefun
+
+
+@deftypefun int LZ_decompress_finished ( void * const @var{decoder} )
+Returns 1 if all the data has been read and @samp{LZ_decompress_close}
+can be safely called. Otherwise it returns 0.
+@end deftypefun
+
+
+@deftypefun {long long} LZ_decompress_data_position ( void * const @var{decoder} )
+Returns the number of decompressed bytes already produced, but perhaps
+not yet read, in the current member.
+@end deftypefun
+
+
+@deftypefun {long long} LZ_decompress_member_position ( void * const @var{decoder} )
+Returns the number of input bytes already decompressed in the current
+member.
+@end deftypefun
+
+
+@deftypefun {long long} LZ_decompress_total_in_size ( void * const @var{decoder} )
+Returns the total number of input bytes already decompressed.
+@end deftypefun
+
+
+@deftypefun {long long} LZ_decompress_total_out_size ( void * const @var{decoder} )
+Returns the total number of decompressed bytes already produced, but
+perhaps not yet read.
+@end deftypefun
+
+
+@node Error Codes
+@chapter Error Codes
+@cindex error codes
+
+Most library functions return -1 to indicate that they have failed. But
+this return value only tells you that an error has occurred. To find out
+what kind of error it was, you need to verify the error code by calling
+@samp{LZ_(de)compress_errno}.
+
+Library functions do not change the value returned by
+@samp{LZ_(de)compress_errno} when they succeed; thus, the value returned
+by @samp{LZ_(de)compress_errno} after a successful call is not
+necessarily zero, and you should not use @samp{LZ_(de)compress_errno} to
+determine whether a call failed. If the call failed, then you can
+examine @samp{LZ_(de)compress_errno}.
+
+The error codes are defined in the header file @samp{lzlib.h}.
+
+@deftypevr Constant {enum LZ_errno} LZ_ok
+The value of this constant is 0 and is used to indicate that there is no
+error.
+@end deftypevr
+
+@deftypevr Constant {enum LZ_errno} LZ_bad_argument
+At least one of the arguments passed to the library function was
+invalid.
+@end deftypevr
+
+@deftypevr Constant {enum LZ_errno} LZ_mem_error
+No memory available. The system cannot allocate more virtual memory
+because its capacity is full.
+@end deftypevr
+
+@deftypevr Constant {enum LZ_errno} LZ_sequence_error
+A library function was called in the wrong order. For example
+@samp{LZ_compress_restart_member} was called before
+@samp{LZ_compress_member_finished} indicates that the current member is
+finished.
+@end deftypevr
+
+@deftypevr Constant {enum LZ_errno} LZ_header_error
+Reading of member header failed. If this happens at the end of the data
+stream it may indicate trailing garbage.
+@end deftypevr
+
+@deftypevr Constant {enum LZ_errno} LZ_unexpected_eof
+The end of the data stream was reached in the middle of a member.
+@end deftypevr
+
+@deftypevr Constant {enum LZ_errno} LZ_data_error
+The data stream is corrupt.
+@end deftypevr
+
+@deftypevr Constant {enum LZ_errno} LZ_library_error
+A bug was detected in the library. Please, report it (@pxref{Problems}).
+@end deftypevr
+
+
+@node Data Format
+@chapter Data Format
+@cindex data format
+
+In the diagram below, a box like this:
+@verbatim
++---+
+|   | <-- the vertical bars might be missing
++---+
+@end verbatim
+
+represents one byte; a box like this:
+@verbatim
++==============+
+|              |
++==============+
+@end verbatim
+
+represents a variable number of bytes.
+
+@sp 1
+A lzip data stream consists of a series of "members" (compressed data
+sets). The members simply appear one after another in the data stream,
+with no additional information before, between, or after them.
+
+Each member has the following structure:
+@verbatim
++--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+| ID string | VN | DS | Lzma stream | CRC32 |   Data size   |  Member size  |
++--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+@end verbatim
+
+All multibyte values are stored in little endian order.
+
+@table @samp
+@item ID string
+A four byte string, identifying the member type, with the value "LZIP".
+
+@item VN (version number, 1 byte)
+Just in case something needs to be modified in the future. Valid values
+are 0 and 1. Version 0 files have only one member and lack @samp{Member
+size}.
+
+@item DS (coded dictionary size, 1 byte)
+Bits 4-0 contain the base 2 logarithm of the base dictionary size.@*
+Bits 7-5 contain the number of "wedges" to substract from the base
+dictionary size to obtain the dictionary size. The size of a wedge is
+(base dictionary size / 16).@*
+Valid values for dictionary size range from 4KiB to 512MiB.
+
+@item Lzma stream
+The lzma stream, finished by an end of stream marker. Uses default values
+for encoder properties.
+
+@item CRC32 (4 bytes)
+CRC of the uncompressed original data.
+
+@item Data size (8 bytes)
+Size of the uncompressed original data.
+
+@item Member size (8 bytes)
+Total size of the member, including header and trailer. This facilitates
+safe recovery of undamaged members from multimember files.
+
+@end table
+
+
+@node Examples
+@chapter A small tutorial with examples
+@cindex examples
+
+This chaper shows the order in which the library functions should be
+called depending on what kind of data stream you want to compress or
+decompress.
+
+@sp 1
+@noindent
+Example 1: Normal compression (@var{member_size} > total output).
+
+@example
+1) LZ_compress_open
+2) LZ_compress_write
+3) LZ_compress_read
+4) go back to step 2 until all input data has been written
+5) LZ_compress_finish
+6) LZ_compress_read
+7) go back to step 6 until LZ_compress_read returns 0
+8) LZ_compress_close
+@end example
+
+
+@sp 1
+@noindent
+Example 2: Decompression.
+
+@example
+1) LZ_decompress_open
+2) LZ_decompress_write
+3) LZ_decompress_read
+4) go back to step 2 until all input data has been written
+5) LZ_decompress_finish
+6) LZ_decompress_read
+7) go back to step 6 until LZ_decompress_read returns 0
+8) LZ_decompress_close
+@end example
+
+
+@sp 1
+@noindent
+Example 3: Multimember compression (@var{member_size} < total output).
+
+@example
+ 1) LZ_compress_open
+ 2) LZ_compress_write
+ 3) LZ_compress_read
+ 4) go back to step 2 until LZ_compress_member_finished returns 1
+ 5) LZ_compress_restart_member
+ 6) go back to step 2 until all input data has been written
+ 7) LZ_compress_finish
+ 8) LZ_compress_read
+ 9) go back to step 8 until LZ_compress_read returns 0
+10) LZ_compress_close
+@end example
+
+
+@node Problems
+@chapter Reporting Bugs
+@cindex bugs
+@cindex getting help
+
+There are probably bugs in Lzlib. 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 Lzlib, please send electronic mail to
+@email{lzip-bug@@nongnu.org}. Include the version number, which you can
+find by running @w{@samp{minilzip --version}} or in
+@samp{LZ_version_string} from @samp{lzlib.h}.
+
+
+@node Concept Index
+@unnumbered Concept Index
+
+@printindex cp
+
+@bye
diff --git a/encoder.cc b/encoder.cc
new file mode 100644
index 0000000..3bc855b
--- /dev/null
+++ b/encoder.cc
@@ -0,0 +1,573 @@
+/*  Lzlib - A compression library for lzip files
+    Copyright (C) 2009 Antonio Diaz Diaz.
+
+    This library 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 3 of the License, or
+    (at your option) any later version.
+
+    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.  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/>.
+
+    As a special exception, you may use this file as part of a free
+    software library without restriction.  Specifically, if other files
+    instantiate templates or use macros or inline functions from this
+    file, or you compile this file and link it with other files to
+    produce an executable, this file does not by itself cause the
+    resulting executable to be covered by the GNU General Public
+    License.  This exception does not however invalidate any other
+    reasons why the executable file might be covered by the GNU General
+    Public License.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <algorithm>
+#include <cerrno>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <stdint.h>
+
+#include "lzlib.h"
+#include "lzip.h"
+#include "encoder.h"
+
+
+const Dis_slots dis_slots;
+const Prob_prices prob_prices;
+
+
+int Matchfinder::write_data( uint8_t * const in_buffer, const int in_size ) throw()
+  {
+  if( at_stream_end_ ) return 0;
+  if( pos >= pos_limit )
+    {
+    const int offset = pos - dictionary_size_ - max_num_trials;
+    const int size = stream_pos - offset;
+//    std::fprintf( stderr, "%6d offset, %5d size, %4d margin.\n",
+//                  offset, size, after_size - ( pos - pos_limit ) );
+    std::memmove( buffer, buffer + offset, size );
+    partial_data_pos += offset;
+    pos -= offset;
+    stream_pos -= offset;
+    for( int i = 0; i < num_prev_positions; ++i )
+      if( prev_positions[i] >= 0 ) prev_positions[i] -= offset;
+    for( int i = 0; i < 2 * dictionary_size_; ++i )
+      if( prev_pos_tree[i] >= 0 ) prev_pos_tree[i] -= offset;
+    }
+  const int size = std::min( buffer_size - stream_pos, in_size );
+  if( size > 0 )
+    {
+    std::memmove( buffer + stream_pos, in_buffer, size );
+    stream_pos += size;
+    }
+  return size;
+  }
+
+
+bool Matchfinder::reset() throw()
+  {
+  const int size = stream_pos - pos;
+  std::memmove( buffer, buffer + pos, size );
+  partial_data_pos = 0;
+  stream_pos -= pos;
+  pos = 0;
+  cyclic_pos = 0;
+  for( int i = 0; i < num_prev_positions; ++i ) prev_positions[i] = -1;
+  return true;
+  }
+
+
+bool Matchfinder::move_pos() throw()
+  {
+  if( ++cyclic_pos >= dictionary_size_ ) cyclic_pos = 0;
+  if( ++pos > stream_pos ) { pos = stream_pos; return false; }
+  return true;
+  }
+
+
+int Matchfinder::longest_match_len( int * const distances ) throw()
+  {
+  int len_limit = match_len_limit_;
+  if( len_limit > available_bytes() )
+    {
+    len_limit = available_bytes();
+    if( len_limit < 4 ) return 0;
+    }
+
+  int maxlen = min_match_len - 1;
+  const int min_pos = (pos >= dictionary_size_) ?
+                      (pos - dictionary_size_ + 1) : 0;
+  const uint8_t * const data = buffer + pos;
+  const int key2 = num_prev_positions4 + num_prev_positions3 +
+                   ( ( (int)data[0] << 8 ) | data[1] );
+  const int tmp = crc32[data[0]] ^ data[1] ^ ( (int)data[2] << 8 );
+  const int key3 = num_prev_positions4 + ( tmp & ( num_prev_positions3 - 1 ) );
+  const int key4 = ( tmp ^ ( crc32[data[3]] << 5 ) ) &
+                   ( num_prev_positions4 - 1 );
+
+  if( distances )
+    {
+    int np = prev_positions[key2];
+    if( np >= min_pos )
+      { distances[2] = pos - np - 1; maxlen = 2; }
+    else distances[2] = 0x7FFFFFFF;
+    np = prev_positions[key3];
+    if( np >= min_pos && buffer[np] == data[0] )
+      { distances[3] = pos - np - 1; maxlen = 3; }
+    else distances[3] = 0x7FFFFFFF;
+    distances[4] = 0x7FFFFFFF;
+    }
+
+  prev_positions[key2] = pos;
+  prev_positions[key3] = pos;
+  int newpos = prev_positions[key4];
+  prev_positions[key4] = pos;
+
+  int idx0 = cyclic_pos << 1;
+  int idx1 = idx0 + 1;
+  int len0 = 0, len1 = 0;
+
+  for( int count = 16 + ( match_len_limit_ / 2 ); ; )
+    {
+    if( newpos < min_pos || --count < 0 )
+      { prev_pos_tree[idx0] = prev_pos_tree[idx1] = -1; break; }
+    const uint8_t * const newdata = buffer + newpos;
+    int len = std::min( len0, len1 );
+    while( len < len_limit && newdata[len] == data[len] ) ++len;
+
+    const int delta = pos - newpos;
+    if( distances ) while( maxlen < len ) distances[++maxlen] = delta - 1;
+
+    const int newidx = ( cyclic_pos - delta +
+      ( ( cyclic_pos >= delta ) ? 0 : dictionary_size_ ) ) << 1;
+
+    if( len < len_limit )
+      {
+      if( newdata[len] < data[len] )
+        {
+        prev_pos_tree[idx0] = newpos;
+        idx0 = newidx + 1;
+        newpos = prev_pos_tree[idx0];
+        len0 = len;
+        }
+      else
+        {
+        prev_pos_tree[idx1] = newpos;
+        idx1 = newidx;
+        newpos = prev_pos_tree[idx1];
+        len1 = len;
+        }
+      }
+    else
+      {
+      prev_pos_tree[idx0] = prev_pos_tree[newidx];
+      prev_pos_tree[idx1] = prev_pos_tree[newidx+1];
+      break;
+      }
+    }
+  if( distances )
+    {
+    if( distances[3] > distances[4] ) distances[3] = distances[4];
+    if( distances[2] > distances[3] ) distances[2] = distances[3];
+    }
+  return maxlen;
+  }
+
+
+void Len_encoder::encode( Range_encoder & range_encoder, int symbol,
+                          const int pos_state )
+  {
+  symbol -= min_match_len;
+  if( symbol < len_low_symbols )
+    {
+    range_encoder.encode_bit( choice1, 0 );
+    range_encoder.encode_tree( bm_low[pos_state], symbol, len_low_bits );
+    }
+  else
+    {
+    range_encoder.encode_bit( choice1, 1 );
+    if( symbol < len_low_symbols + len_mid_symbols )
+      {
+      range_encoder.encode_bit( choice2, 0 );
+      range_encoder.encode_tree( bm_mid[pos_state], symbol - len_low_symbols, len_mid_bits );
+      }
+    else
+      {
+      range_encoder.encode_bit( choice2, 1 );
+      range_encoder.encode_tree( bm_high, symbol - len_low_symbols - len_mid_symbols, len_high_bits );
+      }
+    }
+  if( --counters[pos_state] <= 0 ) update_prices( pos_state );
+  }
+
+
+void LZ_encoder::fill_align_prices() throw()
+  {
+  for( int i = 0; i < dis_align_size; ++i )
+    align_prices[i] = price_symbol_reversed( bm_align, i, dis_align_bits );
+  align_price_count = dis_align_size;
+  }
+
+
+void LZ_encoder::fill_distance_prices() throw()
+  {
+  for( int dis_state = 0; dis_state < max_dis_states; ++dis_state )
+    {
+    int * dsp = dis_slot_prices[dis_state];
+    const Bit_model * bmds = bm_dis_slot[dis_state];
+    int slot = 0;
+    for( ; slot < end_dis_model && slot < num_dis_slots; ++slot )
+      dsp[slot] = price_symbol( bmds, slot, dis_slot_bits );
+    for( ; slot < num_dis_slots; ++slot )
+      dsp[slot] = price_symbol( bmds, slot, dis_slot_bits ) +
+                  (((( slot >> 1 ) - 1 ) - dis_align_bits ) << price_shift );
+
+    int * dp = dis_prices[dis_state];
+    int dis = 0;
+    for( ; dis < start_dis_model; ++dis )
+      dp[dis] = dsp[dis];
+    for( ; dis < modeled_distances; ++dis )
+      {
+      const int dis_slot = dis_slots[dis];
+      const int direct_bits = ( dis_slot >> 1 ) - 1;
+      const int base = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
+      dp[dis] = dsp[dis_slot] +
+          price_symbol_reversed( bm_dis + base - dis_slot, dis - base, direct_bits );
+      }
+    }
+  }
+
+
+// Return value: ( dis == -1 ) && ( len == 1 ) means literal
+int LZ_encoder::best_pair_sequence( const int reps[num_rep_distances],
+                                    const State & state )
+  {
+  int main_len;
+  if( longest_match_found > 0 )		// from previous call
+    {
+    main_len = longest_match_found;
+    longest_match_found = 0;
+    }
+  else main_len = read_match_distances();
+
+  int replens[num_rep_distances];
+  int rep_index = 0;
+  for( int i = 0; i < num_rep_distances; ++i )
+    {
+    replens[i] = matchfinder.true_match_len( 0, reps[i] + 1, max_match_len );
+    if( replens[i] > replens[rep_index] ) rep_index = i;
+    }
+  if( replens[rep_index] >= matchfinder.match_len_limit() )
+    {
+    trials[0].dis = rep_index;
+    trials[0].price = replens[rep_index];
+    if( !move_pos( replens[rep_index], true ) ) return 0;
+    return replens[rep_index];
+    }
+
+  if( main_len >= matchfinder.match_len_limit() )
+    {
+    trials[0].dis = match_distances[matchfinder.match_len_limit()] +
+                    num_rep_distances;
+    trials[0].price = main_len;
+    if( !move_pos( main_len, true ) ) return 0;
+    return main_len;
+    }
+
+  trials[0].state = state;
+  for( int i = 0; i < num_rep_distances; ++i ) trials[0].reps[i] = reps[i];
+
+  const uint8_t cur_byte = matchfinder[0];
+  const uint8_t match_byte = matchfinder[-reps[0]-1];
+  unsigned int position = matchfinder.data_position();
+  const int pos_state = position & pos_state_mask;
+
+  trials[1].dis = -1;
+  trials[1].prev_index = 0;
+  trials[1].price = price0( bm_match[state()][pos_state] );
+  if( state.is_char() )
+    trials[1].price += literal_encoder.price_symbol( matchfinder[-1], cur_byte );
+  else
+    trials[1].price += literal_encoder.price_matched( matchfinder[-1], cur_byte, match_byte );
+
+  const int match_price = price1( bm_match[state()][pos_state] );
+  const int rep_match_price = match_price + price1( bm_rep[state()] );
+
+  if( match_byte == cur_byte )
+    trials[1].update( 0, 0, rep_match_price + price_rep_len1( state, pos_state ) );
+
+  if( main_len < min_match_len )
+    {
+    trials[0].dis = trials[1].dis;
+    trials[0].price = 1;
+    if( !matchfinder.move_pos() ) return 0;
+    return 1;
+    }
+
+  {
+  const int normal_match_price = match_price + price0( bm_rep[state()] );
+  int len = min_match_len;
+  if( main_len <= replens[rep_index] )
+    {
+    main_len = replens[rep_index];
+    for( ; len <= main_len; ++len ) trials[len].price = infinite_price;
+    }
+  else for( ; len <= main_len; ++len )
+    {
+    trials[len].dis = match_distances[len] + num_rep_distances;
+    trials[len].prev_index = 0;
+    trials[len].price = normal_match_price +
+                        price_pair( match_distances[len], len, pos_state );
+    }
+  }
+
+  for( int rep = 0; rep < num_rep_distances; ++rep )
+    for( int len = min_match_len; len <= replens[rep]; ++len )
+      trials[len].update( rep, 0, rep_match_price +
+                                  price_rep( rep, len, state, pos_state ) );
+
+  int cur = 0;
+  int num_trials = main_len;
+  if( !matchfinder.move_pos() ) return 0;
+
+  while( true )
+    {
+    if( ++cur >= num_trials )
+      {
+      backward( cur );
+      return cur;
+      }
+    const int newlen = read_match_distances();
+    if( newlen >= matchfinder.match_len_limit() )
+      {
+      longest_match_found = newlen;
+      backward( cur );
+      return cur;
+      }
+
+    Trial & cur_trial = trials[cur];
+    const int prev_index = cur_trial.prev_index;
+
+    cur_trial.state = trials[prev_index].state;
+
+    for( int i = 0; i < num_rep_distances; ++i )
+      cur_trial.reps[i] = trials[prev_index].reps[i];
+    if( prev_index == cur - 1 )
+      {
+      if( cur_trial.dis == 0 ) cur_trial.state.set_short_rep();
+      else cur_trial.state.set_char();
+      }
+    else
+      {
+      if( cur_trial.dis < num_rep_distances ) cur_trial.state.set_rep();
+      else cur_trial.state.set_match();
+      mtf_reps( cur_trial.dis, cur_trial.reps );
+      }
+
+    const uint8_t cur_byte = matchfinder[0];
+    const uint8_t match_byte = matchfinder[-cur_trial.reps[0]-1];
+    const int pos_state = ++position & pos_state_mask;
+    int next_price = cur_trial.price + price0( bm_match[cur_trial.state()][pos_state] );
+    if( cur_trial.state.is_char() )
+      next_price += literal_encoder.price_symbol( matchfinder[-1], cur_byte );
+    else
+      next_price += literal_encoder.price_matched( matchfinder[-1], cur_byte, match_byte );
+    if( !matchfinder.move_pos() ) return 0;
+
+    Trial & next_trial = trials[cur+1];
+
+    next_trial.update( -1, cur, next_price );
+
+    const int match_price = cur_trial.price + price1( bm_match[cur_trial.state()][pos_state] );
+    const int rep_match_price = match_price + price1( bm_rep[cur_trial.state()] );
+
+    if( match_byte == cur_byte && next_trial.dis != 0 )
+      next_trial.update( 0, cur, rep_match_price +
+                                 price_rep_len1( cur_trial.state, pos_state ) );
+
+    const int len_limit = std::min( std::min( max_num_trials - 1 - cur,
+                          matchfinder.available_bytes() ), matchfinder.match_len_limit() );
+    if( len_limit < min_match_len ) continue;
+
+    for( int rep = 0; rep < num_rep_distances; ++rep )
+      {
+      const int dis = cur_trial.reps[rep] + 1;
+      int len = 0;
+      const uint8_t * const data = matchfinder.ptr_to_current_pos() - 1;
+      while( len < len_limit && data[len] == data[len-dis] ) ++len;
+      if( len >= min_match_len )
+        {
+        while( num_trials < cur + len )
+          trials[++num_trials].price = infinite_price;
+        for( ; len >= min_match_len; --len )
+          trials[cur+len].update( rep, cur, rep_match_price +
+                                  price_rep( rep, len, cur_trial.state, pos_state ) );
+        }
+      }
+
+    if( newlen <= len_limit &&
+        ( newlen > min_match_len ||
+          ( newlen == min_match_len &&
+            match_distances[newlen] < modeled_distances ) ) )
+      {
+      const int normal_match_price = match_price +
+                                     price0( bm_rep[cur_trial.state()] );
+      while( num_trials < cur + newlen )
+        trials[++num_trials].price = infinite_price;
+
+      for( int len = newlen; len >= min_match_len; --len )
+        trials[cur+len].update( match_distances[len] + num_rep_distances, cur,
+                                normal_match_price +
+                                price_pair( match_distances[len], len, pos_state ) );
+      }
+    }
+  }
+
+
+     // End Of Stream mark => (dis == 0xFFFFFFFF, len == min_match_len)
+void LZ_encoder::flush( const State & state )
+  {
+  const int pos_state = ( matchfinder.data_position() ) & pos_state_mask;
+  range_encoder.encode_bit( bm_match[state()][pos_state], 1 );
+  range_encoder.encode_bit( bm_rep[state()], 0 );
+  encode_pair( 0xFFFFFFFF, min_match_len, pos_state );
+  range_encoder.flush();
+  File_trailer trailer;
+  trailer.data_crc( crc() );
+  trailer.data_size( matchfinder.data_position() );
+  trailer.member_size( range_encoder.member_position() + sizeof trailer );
+  for( unsigned int i = 0; i < sizeof trailer; ++i )
+    range_encoder.put_byte( (( uint8_t *)&trailer)[i] );
+  }
+
+
+LZ_encoder::LZ_encoder( Matchfinder & mf, const File_header & header,
+                        const long long member_size )
+  :
+  member_size_limit( member_size - sizeof( File_trailer ) - 15 ),
+  longest_match_found( 0 ),
+  crc_( 0xFFFFFFFF ),
+  matchfinder( mf ),
+  range_encoder(),
+  len_encoder( matchfinder.match_len_limit() ),
+  rep_match_len_encoder( matchfinder.match_len_limit() ),
+  literal_encoder(),
+  num_dis_slots( 2 * File_header::real_bits( matchfinder.dictionary_size() - 1 ) ),
+  fill_counter( 0 ),
+  prev_byte( 0 ),
+  member_finished_( false )
+  {
+  for( int i = 0; i < num_rep_distances; ++i ) rep_distances[i] = 0;
+  fill_align_prices();
+
+  for( unsigned int i = 0; i < sizeof header; ++i )
+    range_encoder.put_byte( (( uint8_t *)&header)[i] );
+  }
+
+
+bool LZ_encoder::encode_member()
+  {
+  if( member_finished_ ) return true;
+  if( !matchfinder.finished() && !matchfinder.available_bytes() )
+    return true;				// need at least 1 byte
+
+  if( range_encoder.member_position() == sizeof( File_header ) &&
+      !matchfinder.finished() )			// copy first byte
+    {
+    range_encoder.encode_bit( bm_match[state()][0], 0 );
+    const uint8_t cur_byte = matchfinder[0];
+    literal_encoder.encode( range_encoder, prev_byte, cur_byte );
+    prev_byte = cur_byte;
+    crc32.update( crc_, cur_byte );
+    if( !move_pos( 1 ) ) return false;
+    }
+
+  while( true )
+    {
+    if( matchfinder.finished() )
+      { flush( state ); member_finished_ = true; return true; }
+    if( !matchfinder.available_bytes() ||
+        ( !matchfinder.at_stream_end() &&
+          matchfinder.available_bytes() < max_num_trials + max_match_len ) )
+      return true;				// need more data
+    if( range_encoder.free_bytes() < 2 * max_num_trials ) return true;
+    if( fill_counter <= 0 ) { fill_distance_prices(); fill_counter = 512; }
+
+    int ahead = best_pair_sequence( rep_distances, state );
+    if( ahead <= 0 ) return false;
+    fill_counter -= ahead;
+
+    for( int i = 0; ; )
+      {
+      const int pos_state = ( matchfinder.data_position() - ahead ) & pos_state_mask;
+      int dis = trials[i].dis;
+      const int len = trials[i].price;
+
+      bool bit = ( dis < 0 && len == 1 );
+      range_encoder.encode_bit( bm_match[state()][pos_state], !bit );
+      if( bit )
+        {
+        const uint8_t cur_byte = matchfinder[-ahead];
+        if( state.is_char() )
+          literal_encoder.encode( range_encoder, prev_byte, cur_byte );
+        else
+          {
+          const uint8_t match_byte = matchfinder[-rep_distances[0]-1-ahead];
+          literal_encoder.encode_matched( range_encoder, prev_byte, match_byte, cur_byte );
+          }
+        state.set_char();
+        prev_byte = cur_byte;
+        }
+      else
+        {
+        mtf_reps( dis, rep_distances );
+        bit = ( dis < num_rep_distances );
+        range_encoder.encode_bit( bm_rep[state()], bit );
+        if( bit )
+          {
+          bit = ( dis == 0 );
+          range_encoder.encode_bit( bm_rep0[state()], !bit );
+          if( bit )
+            range_encoder.encode_bit( bm_len[state()][pos_state], len > 1 );
+          else
+            {
+            range_encoder.encode_bit( bm_rep1[state()], dis > 1 );
+            if( dis > 1 )
+              range_encoder.encode_bit( bm_rep2[state()], dis > 2 );
+            }
+          if( len == 1 ) state.set_short_rep();
+          else
+            {
+            rep_match_len_encoder.encode( range_encoder, len, pos_state );
+            state.set_rep();
+            }
+          }
+        else
+          {
+          encode_pair( dis - num_rep_distances, len, pos_state );
+          state.set_match();
+          }
+        prev_byte = matchfinder[len-1-ahead];
+        }
+      for( int j = 0; j < len; ++j )
+        crc32.update( crc_, matchfinder[j-ahead] );
+      ahead -= len; i += len;
+      if( range_encoder.member_position() >= member_size_limit )
+        {
+        if( !matchfinder.dec_pos( ahead ) ) return false;
+        flush( state );
+        member_finished_ = true;
+        return true;
+        }
+      if( ahead <= 0 ) break;
+      }
+    }
+  }
diff --git a/encoder.h b/encoder.h
new file mode 100644
index 0000000..af8c441
--- /dev/null
+++ b/encoder.h
@@ -0,0 +1,608 @@
+/*  Lzlib - A compression library for lzip files
+    Copyright (C) 2009 Antonio Diaz Diaz.
+
+    This library 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 3 of the License, or
+    (at your option) any later version.
+
+    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.  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/>.
+
+    As a special exception, you may use this file as part of a free
+    software library without restriction.  Specifically, if other files
+    instantiate templates or use macros or inline functions from this
+    file, or you compile this file and link it with other files to
+    produce an executable, this file does not by itself cause the
+    resulting executable to be covered by the GNU General Public
+    License.  This exception does not however invalidate any other
+    reasons why the executable file might be covered by the GNU General
+    Public License.
+*/
+
+const int max_num_trials = 1 << 12;
+const int price_shift = 6;
+
+class Dis_slots
+  {
+  unsigned char data[1<<12];
+
+public:
+  Dis_slots()
+    {
+    for( int slot = 0; slot < 4; ++slot ) data[slot] = slot;
+    for( int i = 4, size = 2, slot = 4; slot < 24; slot += 2 )
+      {
+      std::memset( &data[i], slot, size );
+      std::memset( &data[i+size], slot + 1, size );
+      size <<= 1;
+      i += size;
+      }
+    }
+
+  int operator[]( const uint32_t dis ) const throw()
+    {
+    if( dis < (1 << 12) ) return data[dis];
+    if( dis < (1 << 23) ) return data[dis>>11] + 22;
+    return data[dis>>22] + 44;
+    }
+  };
+
+extern const Dis_slots dis_slots;
+
+class Prob_prices
+  {
+  int data[bit_model_total >> 2];
+
+public:
+  Prob_prices()
+    {
+    const int num_bits = ( bit_model_total_bits - 2 );
+    for( int i = num_bits - 1; i >= 0; --i )
+      {
+      int start = 1 << ( num_bits - i - 1 );
+      int end = 1 << ( num_bits - i);
+      for( int j = start; j < end; ++j )
+        data[j] = (i << price_shift) +
+            ( ((end - j) << price_shift) >> (num_bits - i - 1) );
+      }
+    }
+
+  int operator[]( const int symbol ) const throw()
+    { return data[symbol >> 2]; }
+  };
+
+extern const Prob_prices prob_prices;
+
+inline int price0( const Bit_model & bm ) throw()
+  { return prob_prices[bm.probability]; }
+
+inline int price1( const Bit_model & bm ) throw()
+  { return prob_prices[bit_model_total-bm.probability]; }
+
+inline int price_bit( const Bit_model & bm, const int bit ) throw()
+  { if( bit ) return price1( bm ); else return price0( bm ); }
+
+inline int price_symbol( const Bit_model bm[], int symbol, const int num_bits ) throw()
+  {
+  symbol |= ( 1 << num_bits );
+  int price = 0;
+  while( symbol > 1 )
+    {
+    const int bit = symbol & 1;
+    symbol >>= 1;
+    price += price_bit( bm[symbol-1], bit );
+    }
+  return price;
+  }
+
+inline int price_symbol_reversed( const Bit_model bm[], int symbol,
+                                  const int num_bits ) throw()
+  {
+  int price = 0;
+  int model = 1;
+  for( int i = num_bits; i > 0; --i )
+    {
+    const int bit = symbol & 1;
+    symbol >>= 1;
+    price += price_bit( bm[model-1], bit );
+    model = ( model << 1 ) | bit;
+    }
+  return price;
+  }
+
+inline int price_matched( const Bit_model bm[], const int symbol,
+                          const int match_byte ) throw()
+  {
+  int price = 0;
+  int model = 1;
+
+  for( int i = 7; i >= 0; --i )
+    {
+    const int match_bit = ( match_byte >> i ) & 1;
+    const int bit = ( symbol >> i ) & 1;
+    price += price_bit( bm[(match_bit<<8)+model+0xFF], bit );
+    model = ( model << 1 ) | bit;
+    if( match_bit != bit )
+      {
+      while( --i >= 0 )
+        {
+        const int bit = ( symbol >> i ) & 1;
+        price += price_bit( bm[model-1], bit );
+        model = ( model << 1 ) | bit;
+        }
+      break;
+      }
+    }
+  return price;
+  }
+
+
+class Matchfinder
+  {
+  enum { num_prev_positions4 = 1 << 20,
+         num_prev_positions3 = 1 << 18,
+         num_prev_positions2 = 1 << 16,
+         num_prev_positions = num_prev_positions4 + num_prev_positions3 +
+                              num_prev_positions2 };
+
+  long long partial_data_pos;
+  const int dictionary_size_;	// bytes to keep in buffer before pos
+  const int after_size;		// bytes to keep in buffer after pos
+  const int buffer_size;
+  uint8_t * const buffer;
+  int pos;
+  int cyclic_pos;
+  int stream_pos;		// first byte not yet read from file
+  const int pos_limit;		// when reached, a new block must be read
+  const int match_len_limit_;
+  int32_t * const prev_positions;	// last seen position of key
+  int32_t * prev_pos_tree;
+  bool at_stream_end_;		// stream_pos shows real end of file
+
+public:
+  Matchfinder( const int dict_size, const int len_limit )
+    :
+    partial_data_pos( 0 ),
+    dictionary_size_( dict_size ),
+    after_size( max_num_trials + max_match_len ),
+    buffer_size( ( 2 * std::max( 65536, dictionary_size_ ) ) +
+                 max_num_trials + after_size ),
+    buffer( new( std::nothrow ) uint8_t[buffer_size] ),
+    pos( 0 ),
+    cyclic_pos( 0 ),
+    stream_pos( 0 ),
+    pos_limit( buffer_size - after_size ),
+    match_len_limit_( len_limit ),
+    prev_positions( new( std::nothrow ) int32_t[num_prev_positions] ),
+    at_stream_end_( false )
+    {
+    prev_pos_tree = new( std::nothrow ) int32_t[2*dictionary_size_];
+    if( !buffer || !prev_positions || !prev_pos_tree )
+      {
+      if( prev_pos_tree ) delete[] prev_pos_tree;
+      if( prev_positions ) delete[] prev_positions;
+      if( buffer ) delete[] buffer;
+      throw std::bad_alloc();
+      }
+    for( int i = 0; i < num_prev_positions; ++i ) prev_positions[i] = -1;
+    }
+
+  ~Matchfinder()
+    { delete[] prev_pos_tree; delete[] prev_positions; delete[] buffer; }
+
+  uint8_t operator[]( const int i ) const throw() { return buffer[pos+i]; }
+  bool at_stream_end() const throw() { return at_stream_end_; }
+  int available_bytes() const throw() { return stream_pos - pos; }
+  long long data_position() const throw() { return partial_data_pos + pos; }
+  int dictionary_size() const throw() { return dictionary_size_; }
+  void finish() throw() { at_stream_end_ = true; }
+  bool finished() const throw() { return at_stream_end_ && pos >= stream_pos; }
+  int match_len_limit() const throw() { return match_len_limit_; }
+  const uint8_t * ptr_to_current_pos() const throw() { return buffer + pos; }
+
+  bool dec_pos( const int ahead ) throw()
+    {
+    if( ahead < 0 || pos < ahead ) return false;
+    pos -= ahead;
+    cyclic_pos -= ahead;
+    if( cyclic_pos < 0 ) cyclic_pos += dictionary_size_;
+    return true;
+    }
+
+  int true_match_len( const int index, const int distance, int len_limit ) const throw()
+    {
+    if( index + len_limit > available_bytes() )
+      len_limit = available_bytes() - index;
+    const uint8_t * const data = buffer + pos + index - distance;
+    int i = 0;
+    while( i < len_limit && data[i] == data[i+distance] ) ++i;
+    return i;
+    }
+
+  int write_data( uint8_t * const in_buffer, const int in_size ) throw();
+  bool reset() throw();
+  bool move_pos() throw();
+  int longest_match_len( int * const distances = 0 ) throw();
+  };
+
+
+class Range_encoder : public Circular_buffer
+  {
+  uint64_t low;
+  long long partial_member_pos;
+  uint32_t range;
+  int ff_count;
+  uint8_t cache;
+
+  void shift_low()
+    {
+    const uint32_t carry = low >> 32;
+    if( low < 0xFF000000 || carry == 1 )
+      {
+      put_byte( cache + carry );
+      for( ; ff_count > 0; --ff_count ) put_byte( 0xFF + carry );
+      cache = low >> 24;
+      }
+    else ++ff_count;
+    low = ( low & 0x00FFFFFF ) << 8;
+    }
+
+public:
+  Range_encoder()
+    :
+    Circular_buffer( 65536 + (2 * max_num_trials) ),
+    low( 0 ),
+    partial_member_pos( 0 ),
+    range( 0xFFFFFFFF ),
+    ff_count( 0 ),
+    cache( 0 ) {}
+
+  int read_data( uint8_t * const out_buffer, const int out_size ) throw()
+    {
+    const int size = Circular_buffer::read_data( out_buffer, out_size );
+    if( size > 0 ) partial_member_pos += size;
+    return size;
+    }
+
+  void flush() { for( int i = 0; i < 5; ++i ) shift_low(); }
+
+  long long member_position() const throw()
+    { return partial_member_pos + used_bytes() + ff_count; }
+
+  void encode( const int symbol, const int num_bits )
+    {
+    for( int i = num_bits - 1; i >= 0; --i )
+      {
+      range >>= 1;
+      if( (symbol >> i) & 1 ) low += range;
+      if( range <= 0x00FFFFFF ) { range <<= 8; shift_low(); }
+      }
+    }
+
+  void encode_bit( Bit_model & bm, const int bit )
+    {
+    const uint32_t bound = ( range >> bit_model_total_bits ) * bm.probability;
+    if( !bit )
+      {
+      range = bound;
+      bm.probability += (bit_model_total - bm.probability) >> bit_model_move_bits;
+      }
+    else
+      {
+      low += bound;
+      range -= bound;
+      bm.probability -= bm.probability >> bit_model_move_bits;
+      }
+    if( range <= 0x00FFFFFF ) { range <<= 8; shift_low(); }
+    }
+
+  void encode_tree( Bit_model bm[], const int symbol, const int num_bits )
+    {
+    int mask = ( 1 << ( num_bits - 1 ) );
+    int model = 1;
+    for( int i = num_bits; i > 0; --i, mask >>= 1 )
+      {
+      const int bit = ( symbol & mask );
+      encode_bit( bm[model-1], bit );
+      model <<= 1;
+      if( bit ) model |= 1;
+      }
+    }
+
+  void encode_tree_reversed( Bit_model bm[], int symbol, const int num_bits )
+    {
+    int model = 1;
+    for( int i = num_bits; i > 0; --i )
+      {
+      const int bit = symbol & 1;
+      encode_bit( bm[model-1], bit );
+      model = ( model << 1 ) | bit;
+      symbol >>= 1;
+      }
+    }
+
+  void encode_matched( Bit_model bm[], int symbol, int match_byte )
+    {
+    int model = 1;
+    for( int i = 7; i >= 0; --i )
+      {
+      const int bit = ( symbol >> i ) & 1;
+      const int match_bit = ( match_byte >> i ) & 1;
+      encode_bit( bm[(match_bit<<8)+model+0xFF], bit );
+      model = ( model << 1 ) | bit;
+      if( match_bit != bit )
+        {
+        while( --i >= 0 )
+          {
+          const int bit = ( symbol >> i ) & 1;
+          encode_bit( bm[model-1], bit );
+          model = ( model << 1 ) | bit;
+          }
+        break;
+        }
+      }
+    }
+  };
+
+
+class Len_encoder
+  {
+  Bit_model choice1;
+  Bit_model choice2;
+  Bit_model bm_low[pos_states][len_low_symbols];
+  Bit_model bm_mid[pos_states][len_mid_symbols];
+  Bit_model bm_high[len_high_symbols];
+  int prices[pos_states][max_len_symbols];
+  const int len_symbols;
+  int counters[pos_states];
+
+  void update_prices( const int pos_state ) throw()
+    {
+    int * const pps = prices[pos_state];
+    int price = price0( choice1 );
+    int len = 0;
+    for( ; len < len_low_symbols && len < len_symbols; ++len )
+      pps[len] = price +
+                 price_symbol( bm_low[pos_state], len, len_low_bits );
+    price = price1( choice1 );
+    for( ; len < len_low_symbols + len_mid_symbols && len < len_symbols; ++len )
+      pps[len] = price + price0( choice2 ) +
+                 price_symbol( bm_mid[pos_state], len - len_low_symbols, len_mid_bits );
+    for( ; len < len_symbols; ++len )
+      pps[len] = price + price1( choice2 ) +
+                 price_symbol( bm_high, len - len_low_symbols - len_mid_symbols, len_high_bits );
+    counters[pos_state] = len_symbols;
+    }
+
+public:
+  Len_encoder( const int len_limit )
+    : len_symbols( len_limit + 1 - min_match_len )
+    {
+    for( int i = 0; i < pos_states; ++i ) update_prices( i );
+    }
+
+  void encode( Range_encoder & range_encoder, int symbol,
+               const int pos_state );
+
+  int price( const int symbol, const int pos_state ) const throw()
+    { return prices[pos_state][symbol - min_match_len]; }
+  };
+
+
+class Literal_encoder
+  {
+  Bit_model bm_literal[1<<literal_context_bits][0x300];
+
+  int state( const int prev_byte ) const throw()
+    { return ( prev_byte >> ( 8 - literal_context_bits ) ); }
+
+public:
+  void encode( Range_encoder & range_encoder, uint8_t prev_byte, uint8_t symbol )
+    { range_encoder.encode_tree( bm_literal[state(prev_byte)], symbol, 8 ); }
+
+  void encode_matched( Range_encoder & range_encoder, uint8_t prev_byte, uint8_t match_byte, uint8_t symbol )
+    { range_encoder.encode_matched( bm_literal[state(prev_byte)], symbol, match_byte ); }
+
+  int price_matched( uint8_t prev_byte, uint8_t symbol, uint8_t match_byte ) const throw()
+    { return ::price_matched( bm_literal[state(prev_byte)], symbol, match_byte ); }
+
+  int price_symbol( uint8_t prev_byte, uint8_t symbol ) const throw()
+    { return ::price_symbol( bm_literal[state(prev_byte)], symbol, 8 ); }
+  };
+
+
+class LZ_encoder
+  {
+  enum { dis_align_mask = dis_align_size - 1,
+         infinite_price = 0x0FFFFFFF,
+         num_rep_distances = 4 };	// must be 4
+
+  struct Trial
+    {
+    State state;
+    int dis;
+    int prev_index;
+    int price;		// dual use var; cumulative price, match length
+    int reps[num_rep_distances];
+    void update( const int d, const int p_i, const int pr ) throw()
+      { if( pr < price ) { dis = d; prev_index = p_i; price = pr; } }
+    };
+
+  const long long member_size_limit;
+  int longest_match_found;
+  uint32_t crc_;
+
+  Bit_model bm_match[State::states][pos_states];
+  Bit_model bm_rep[State::states];
+  Bit_model bm_rep0[State::states];
+  Bit_model bm_rep1[State::states];
+  Bit_model bm_rep2[State::states];
+  Bit_model bm_len[State::states][pos_states];
+  Bit_model bm_dis_slot[max_dis_states][1<<dis_slot_bits];
+  Bit_model bm_dis[modeled_distances-end_dis_model];
+  Bit_model bm_align[dis_align_size];
+
+  Matchfinder & matchfinder;
+  Range_encoder range_encoder;
+  Len_encoder len_encoder;
+  Len_encoder rep_match_len_encoder;
+  Literal_encoder literal_encoder;
+
+  const int num_dis_slots;
+  int rep_distances[num_rep_distances];
+  int match_distances[max_match_len+1];
+  Trial trials[max_num_trials];
+
+  int dis_slot_prices[max_dis_states][2*max_dictionary_bits];
+  int dis_prices[max_dis_states][modeled_distances];
+  int align_prices[dis_align_size];
+  int align_price_count;
+  int fill_counter;
+  State state;
+  uint8_t prev_byte;
+  bool member_finished_;
+
+  void fill_align_prices() throw();
+  void fill_distance_prices() throw();
+
+  uint32_t crc() const throw() { return crc_ ^ 0xFFFFFFFF; }
+
+  void mtf_reps( const int dis, int reps[num_rep_distances] ) throw()
+    {
+    if( dis >= num_rep_distances )
+      {
+      for( int i = num_rep_distances - 1; i > 0; --i ) reps[i] = reps[i-1];
+      reps[0] = dis - num_rep_distances;
+      }
+    else if( dis > 0 )
+      {
+      const int distance = reps[dis];
+      for( int i = dis; i > 0; --i ) reps[i] = reps[i-1];
+      reps[0] = distance;
+      }
+    }
+
+  int price_rep_len1( const State & state, const int pos_state ) const throw()
+    {
+    return price0( bm_rep0[state()] ) + price0( bm_len[state()][pos_state] );
+    }
+
+  int price_rep( const int rep, const int len, const State & state,
+                 const int pos_state ) const throw()
+    {
+    int price = rep_match_len_encoder.price( len, pos_state );
+    if( rep == 0 )
+      {
+      price += price0( bm_rep0[state()] );
+      price += price1( bm_len[state()][pos_state] );
+      }
+    else
+      {
+      price += price1( bm_rep0[state()] );
+      if( rep == 1 )
+        price += price0( bm_rep1[state()] );
+      else
+        {
+        price += price1( bm_rep1[state()] );
+        price += price_bit( bm_rep2[state()], rep - 2 );
+        }
+      }
+    return price;
+    }
+
+  int price_pair( const int dis, const int len, const int pos_state ) const throw()
+    {
+    if( len <= min_match_len && dis >= modeled_distances )
+      return infinite_price;
+    int price = len_encoder.price( len, pos_state );
+    const int dis_state = get_dis_state( len );
+    if( dis < modeled_distances )
+      price += dis_prices[dis_state][dis];
+    else
+      price += dis_slot_prices[dis_state][dis_slots[dis]] +
+               align_prices[dis & dis_align_mask];
+    return price;
+    }
+
+  void encode_pair( const uint32_t dis, const int len, const int pos_state ) throw()
+    {
+    len_encoder.encode( range_encoder, len, pos_state );
+    const int dis_slot = dis_slots[dis];
+    range_encoder.encode_tree( bm_dis_slot[get_dis_state(len)], dis_slot, dis_slot_bits );
+
+    if( dis_slot >= start_dis_model )
+      {
+      const int direct_bits = ( dis_slot >> 1 ) - 1;
+      const uint32_t base = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
+      const uint32_t direct_dis = dis - base;
+
+      if( dis_slot < end_dis_model )
+        range_encoder.encode_tree_reversed( bm_dis + base - dis_slot,
+                                            direct_dis, direct_bits );
+      else
+        {
+        range_encoder.encode( direct_dis >> dis_align_bits, direct_bits - dis_align_bits );
+        range_encoder.encode_tree_reversed( bm_align, direct_dis, dis_align_bits );
+        if( --align_price_count <= 0 ) fill_align_prices();
+        }
+      }
+    }
+
+  int read_match_distances() throw()
+    {
+    int len = matchfinder.longest_match_len( match_distances );
+    if( len == matchfinder.match_len_limit() )
+      len += matchfinder.true_match_len( len, match_distances[len] + 1, max_match_len - len );
+    return len;
+    }
+
+  bool move_pos( int n, bool skip = false ) throw()
+    {
+    while( --n >= 0 )
+      {
+      if( skip ) skip = false;
+      else matchfinder.longest_match_len();
+      if( !matchfinder.move_pos() ) return false;
+      }
+    return true;
+    }
+
+  void backward( int cur )
+    {
+    int & dis = trials[cur].dis;
+    while( cur > 0 )
+      {
+      const int prev_index = trials[cur].prev_index;
+      Trial & prev_trial = trials[prev_index];
+      std::swap( dis, prev_trial.dis );
+      prev_trial.price = cur - prev_index;		// len
+      cur = prev_index;
+      }
+    }
+
+  int best_pair_sequence( const int reps[num_rep_distances],
+                          const State & state );
+
+  void flush( const State & state );
+
+public:
+  LZ_encoder( Matchfinder & mf, const File_header & header,
+              const long long member_size );
+
+  bool encode_member();
+  void finish_member()
+    { if( !member_finished_ ) { flush( state ); member_finished_ = true; } }
+  bool member_finished() const throw()
+    { return member_finished_ && !range_encoder.used_bytes(); }
+  int read_data( uint8_t * const buffer, const int size ) throw()
+    { return range_encoder.read_data( buffer, size ); }
+
+  long long member_position() const throw()
+    { return range_encoder.member_position(); }
+  };
diff --git a/lzip.h b/lzip.h
new file mode 100644
index 0000000..a568988
--- /dev/null
+++ b/lzip.h
@@ -0,0 +1,276 @@
+/*  Lzlib - A compression library for lzip files
+    Copyright (C) 2009 Antonio Diaz Diaz.
+
+    This library 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 3 of the License, or
+    (at your option) any later version.
+
+    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.  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/>.
+
+    As a special exception, you may use this file as part of a free
+    software library without restriction.  Specifically, if other files
+    instantiate templates or use macros or inline functions from this
+    file, or you compile this file and link it with other files to
+    produce an executable, this file does not by itself cause the
+    resulting executable to be covered by the GNU General Public
+    License.  This exception does not however invalidate any other
+    reasons why the executable file might be covered by the GNU General
+    Public License.
+*/
+
+class State
+  {
+  unsigned char st;
+
+public:
+  enum { states = 12 };
+  State() throw() : st( 0 ) {}
+  int operator()() const throw() { return st; }
+  bool is_char() const throw() { return st < 7; }
+
+  void set_char() throw()
+    {
+    static const unsigned char next[states] = {0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5};
+    st = next[st];
+    }
+  void set_match() throw()
+    {
+    static const unsigned char next[states] = {7, 7, 7, 7, 7, 7, 7, 10, 10, 10, 10, 10};
+    st = next[st];
+    }
+  void set_rep() throw()
+    {
+    static const unsigned char next[states] = {8, 8, 8, 8, 8, 8, 8, 11, 11, 11, 11, 11};
+    st = next[st];
+    }
+  void set_short_rep() throw()
+    {
+    static const unsigned char next[states] = {9, 9, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11};
+    st = next[st];
+    }
+  };
+
+
+const int literal_context_bits = 3;
+const int pos_state_bits = 2;
+const int pos_states = 1 << pos_state_bits;
+const int pos_state_mask = pos_states - 1;
+
+const int dis_slot_bits = 6;
+const int start_dis_model = 4;
+const int end_dis_model = 14;
+const int modeled_distances = 1 << (end_dis_model / 2);
+const int dis_align_bits = 4;
+const int dis_align_size = 1 << dis_align_bits;
+
+const int len_low_bits = 3;
+const int len_mid_bits = 3;
+const int len_high_bits = 8;
+const int len_low_symbols = 1 << len_low_bits;
+const int len_mid_symbols = 1 << len_mid_bits;
+const int len_high_symbols = 1 << len_high_bits;
+const int max_len_symbols = len_low_symbols + len_mid_symbols + len_high_symbols;
+
+const int min_match_len = 2;		// must be 2
+const int max_match_len = min_match_len + max_len_symbols - 1;	// 273
+
+const int max_dis_states = 4;
+
+inline int get_dis_state( int len ) throw()
+  {
+  len -= min_match_len;
+  if( len >= max_dis_states ) len = max_dis_states - 1;
+  return len;
+  }
+
+
+const int bit_model_move_bits = 5;
+const int bit_model_total_bits = 11;
+const int bit_model_total = 1 << bit_model_total_bits;
+
+struct Bit_model
+  {
+  unsigned int probability;
+  Bit_model() throw() : probability( bit_model_total / 2 ) {}
+  };
+
+
+class CRC32
+  {
+  uint32_t data[256];		// Table of CRCs of all 8-bit messages.
+
+public:
+  CRC32()
+    {
+    for( unsigned int n = 0; n < 256; ++n )
+      {
+      unsigned int c = n;
+      for( int k = 0; k < 8; ++k )
+        { if( c & 1 ) c = 0xEDB88320 ^ ( c >> 1 ); else c >>= 1; }
+      data[n] = c;
+      }
+    }
+
+  uint32_t operator[]( const uint8_t byte ) const throw() { return data[byte]; }
+  void update( uint32_t & crc, const uint8_t byte ) const throw()
+    { crc = data[(crc^byte)&0xFF] ^ ( crc >> 8 ); }
+  };
+
+extern const CRC32 crc32;
+
+
+const char * const magic_string = "LZIP";
+
+struct File_header
+  {
+  char magic[4];
+  uint8_t version;
+  uint8_t coded_dict_size;
+
+  void set_magic() throw()
+    { std::memcpy( magic, magic_string, sizeof magic ); version = 1; }
+
+  bool verify_magic() const throw()
+    {
+    return ( std::memcmp( magic, magic_string, sizeof magic ) == 0 );
+    }
+
+  bool verify_version() const throw()
+    {
+    return ( version <= 1 );
+    }
+
+  static int real_bits( const int value ) throw()
+    {
+    int bits = 0;
+    for( int i = 1, mask = 1; mask > 0; ++i, mask <<= 1 )
+      if( value & mask ) bits = i;
+    return bits;
+    }
+
+  int dictionary_size() const throw()
+    {
+    int size = ( 1 << ( coded_dict_size & 0x1F ) );
+    if( size > min_dictionary_size && size <= max_dictionary_size )
+      size -= ( size / 16 ) * ( ( coded_dict_size >> 5 ) & 0x07 );
+    return size;
+    }
+
+  bool dictionary_size( const int size ) throw()
+    {
+    if( size >= min_dictionary_size && size <= max_dictionary_size )
+      {
+      coded_dict_size = real_bits( size - 1 );
+      if( size > min_dictionary_size )
+        {
+        const int base_size = 1 << coded_dict_size;
+        const int wedge = base_size / 16;
+        for( int i = 7; i >= 1; --i )
+          if( base_size - ( i * wedge ) >= size )
+            { coded_dict_size |= ( i << 5 ); break; }
+        }
+      return true;
+      }
+    return false;
+    }
+  };
+
+
+struct File_trailer
+  {
+  uint8_t data_crc_[4];		// CRC32 of the uncompressed data
+  uint8_t data_size_[8];	// size of the uncompressed data
+  uint8_t member_size_[8];	// member size including header and trailer
+
+  static int size( const int version )
+    { return sizeof( File_trailer ) - ( ( version >= 1 ) ? 0 : 8 ); }
+
+  uint32_t data_crc() const throw()
+    {
+    uint32_t tmp = 0;
+    for( int i = 3; i >= 0; --i ) { tmp <<= 8; tmp += data_crc_[i]; }
+    return tmp;
+    }
+
+  void data_crc( uint32_t crc ) throw()
+    {
+    for( int i = 0; i < 4; ++i )
+      { data_crc_[i] = (uint8_t)crc; crc >>= 8; }
+    }
+
+  long long data_size() const throw()
+    {
+    long long tmp = 0;
+    for( int i = 7; i >= 0; --i ) { tmp <<= 8; tmp += data_size_[i]; }
+    return tmp;
+    }
+
+  void data_size( long long size ) throw()
+    {
+    for( int i = 0; i < 8; ++i )
+      { data_size_[i] = (uint8_t)size; size >>= 8; }
+    }
+
+  long long member_size() const throw()
+    {
+    long long tmp = 0;
+    for( int i = 7; i >= 0; --i ) { tmp <<= 8; tmp += member_size_[i]; }
+    return tmp;
+    }
+
+  void member_size( long long size ) throw()
+    {
+    for( int i = 0; i < 8; ++i )
+      { member_size_[i] = (uint8_t)size; size >>= 8; }
+    }
+  };
+
+
+class Circular_buffer
+  {
+protected:
+  const int buffer_size;
+  uint8_t * const buffer;
+  int get;
+  int put;
+
+  void reset() throw() { get = 0; put = 0; }
+
+public:
+  Circular_buffer( const int buf_size )
+    :
+    buffer_size( buf_size + 1 ),
+    buffer( new uint8_t[buffer_size] ),
+    get( 0 ),
+    put( 0 ) {}
+
+  ~Circular_buffer() { delete[] buffer; }
+
+  int used_bytes() const throw()
+    { return ( (get <= put) ? 0 : buffer_size ) + put - get; }
+  int free_bytes() const throw()
+    { return ( (get <= put) ? buffer_size : 0 ) - put + get - 1; }
+
+  uint8_t get_byte() throw()
+    {
+    const uint8_t b = buffer[get];
+    if( ++get >= buffer_size ) get = 0;
+    return b;
+    }
+
+  void put_byte( const uint8_t b ) throw()
+    {
+    buffer[put] = b;
+    if( ++put >= buffer_size ) put = 0;
+    }
+
+  int read_data( uint8_t * const out_buffer, const int out_size ) throw();
+  int write_data( uint8_t * const in_buffer, const int in_size ) throw();
+  };
diff --git a/lzlib.cc b/lzlib.cc
new file mode 100644
index 0000000..d3f9777
--- /dev/null
+++ b/lzlib.cc
@@ -0,0 +1,406 @@
+/*  Lzlib - A compression library for lzip files
+    Copyright (C) 2009 Antonio Diaz Diaz.
+
+    This library 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 3 of the License, or
+    (at your option) any later version.
+
+    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.  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/>.
+
+    As a special exception, you may use this file as part of a free
+    software library without restriction.  Specifically, if other files
+    instantiate templates or use macros or inline functions from this
+    file, or you compile this file and link it with other files to
+    produce an executable, this file does not by itself cause the
+    resulting executable to be covered by the GNU General Public
+    License.  This exception does not however invalidate any other
+    reasons why the executable file might be covered by the GNU General
+    Public License.
+*/
+
+#include <algorithm>
+#include <cstring>
+#include <vector>
+#include <stdint.h>
+
+#include "lzlib.h"
+#include "lzip.h"
+#include "decoder.h"
+#include "encoder.h"
+
+
+namespace {
+
+struct Encoder
+  {
+  long long partial_in_size;
+  long long partial_out_size;
+  Matchfinder * matchfinder;
+  LZ_encoder * lz_encoder;
+  LZ_errno lz_errno;
+  const File_header member_header;
+
+  Encoder( const File_header & header ) throw()
+    :
+    partial_in_size( 0 ),
+    partial_out_size( 0 ),
+    matchfinder( 0 ),
+    lz_encoder( 0 ),
+    lz_errno( LZ_ok ),
+    member_header( header )
+    {}
+  };
+
+
+bool verify_encoder( void * const encoder )
+  {
+  if( !encoder ) return false;
+  Encoder & e = *(Encoder *)encoder;
+  if( !e.matchfinder || !e.lz_encoder )
+    { e.lz_errno = LZ_bad_argument; return false; }
+  return true;
+  }
+
+
+struct Decoder
+  {
+  long long partial_in_size;
+  long long partial_out_size;
+  Input_buffer * ibuf;
+  LZ_decoder * lz_decoder;
+  LZ_errno lz_errno;
+
+  Decoder() throw()
+    :
+    partial_in_size( 0 ),
+    partial_out_size( 0 ),
+    ibuf( 0 ),
+    lz_decoder( 0 ),
+    lz_errno( LZ_ok )
+    {}
+  };
+
+
+bool verify_decoder( void * const decoder )
+  {
+  if( !decoder ) return false;
+  if( !((Decoder *)decoder)->ibuf )
+    { ((Decoder *)decoder)->lz_errno = LZ_bad_argument; return false; }
+  return true;
+  }
+
+} // end namespace
+
+
+
+
+const char * LZ_version() { return LZ_version_string; }
+
+
+void * LZ_compress_open( const int dictionary_size, const int match_len_limit,
+                         const long long member_size )
+  {
+  File_header header;
+  header.set_magic();
+  const bool error = ( !header.dictionary_size( dictionary_size ) ||
+                       match_len_limit < 5 || match_len_limit > max_match_len );
+
+  Encoder * encoder = new( std::nothrow ) Encoder( header );
+  if( !encoder ) return 0;
+  Encoder & e = *encoder;
+  if( error ) e.lz_errno = LZ_bad_argument;
+  else
+    {
+    try {
+      e.matchfinder = new Matchfinder( header.dictionary_size(), match_len_limit );
+      }
+    catch( std::bad_alloc ) { e.matchfinder = 0; }
+    if( e.matchfinder )
+      {
+      try {
+        e.lz_encoder = new LZ_encoder( *e.matchfinder, header, member_size );
+        }
+      catch( std::bad_alloc )
+        {
+        delete e.matchfinder;
+        e.matchfinder = 0;
+        e.lz_encoder = 0;
+        }
+      }
+    if( !e.lz_encoder ) e.lz_errno = LZ_mem_error;
+    }
+  return encoder;
+  }
+
+
+int LZ_compress_close( void * const encoder )
+  {
+  if( !encoder ) return -1;
+  Encoder & e = *(Encoder *)encoder;
+  if( e.lz_encoder ) delete e.lz_encoder;
+  if( e.matchfinder ) delete e.matchfinder;
+  delete (Encoder *)encoder;
+  return 0;
+  }
+
+
+int LZ_compress_finish( void * const encoder )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  ((Encoder *)encoder)->matchfinder->finish();
+  return 0;
+  }
+
+
+int LZ_compress_finish_member( void * const encoder )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  ((Encoder *)encoder)->lz_encoder->finish_member();
+  return 0;
+  }
+
+
+int LZ_compress_restart_member( void * const encoder,
+                                const long long member_size )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  Encoder & e = *(Encoder *)encoder;
+  if( !e.lz_encoder->member_finished() )
+    { e.lz_errno = LZ_sequence_error; return -1; }
+
+  e.partial_in_size += e.matchfinder->data_position();
+  e.partial_out_size += e.lz_encoder->member_position();
+  if( !e.matchfinder->reset() )
+    { e.lz_errno = LZ_library_error; return -1; }
+
+  delete e.lz_encoder;
+  try {
+    e.lz_encoder = new LZ_encoder( *e.matchfinder, e.member_header, member_size );
+    }
+  catch( std::bad_alloc )
+    { e.lz_encoder = 0; e.lz_errno = LZ_mem_error; return -1; }
+  return 0;
+  }
+
+
+int LZ_compress_read( void * const encoder, uint8_t * const buffer,
+                      const int size )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  Encoder & e = *(Encoder *)encoder;
+  if( !e.lz_encoder->encode_member() )
+    { e.lz_errno = LZ_library_error; return -1; }
+  return e.lz_encoder->read_data( buffer, size );
+  }
+
+
+int LZ_compress_write( void * const encoder, uint8_t * const buffer,
+                       const int size )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  return ((Encoder *)encoder)->matchfinder->write_data( buffer, size );
+  }
+
+
+enum LZ_errno LZ_compress_errno( void * const encoder )
+  {
+  if( !encoder ) return LZ_bad_argument;
+  return ((Encoder *)encoder)->lz_errno;
+  }
+
+
+int LZ_compress_finished( void * const encoder )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  Encoder & e = *(Encoder *)encoder;
+  return ( e.matchfinder->finished() && e.lz_encoder->member_finished() );
+  }
+
+
+int LZ_compress_member_finished( void * const encoder )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  return ((Encoder *)encoder)->lz_encoder->member_finished();
+  }
+
+
+long long LZ_compress_data_position( void * const encoder )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  return ((Encoder *)encoder)->matchfinder->data_position();
+  }
+
+
+long long LZ_compress_member_position( void * const encoder )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  return ((Encoder *)encoder)->lz_encoder->member_position();
+  }
+
+
+long long LZ_compress_total_in_size( void * const encoder )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  Encoder & e = *(Encoder *)encoder;
+  return e.partial_in_size + e.matchfinder->data_position();
+  }
+
+
+long long LZ_compress_total_out_size( void * const encoder )
+  {
+  if( !verify_encoder( encoder ) ) return -1;
+  Encoder & e = *(Encoder *)encoder;
+  return e.partial_out_size + e.lz_encoder->member_position();
+  }
+
+
+void * LZ_decompress_open()
+  {
+  Decoder * decoder = new( std::nothrow ) Decoder();
+  if( !decoder ) return 0;
+
+  try { decoder->ibuf = new Input_buffer(); }
+  catch( std::bad_alloc )
+    { decoder->ibuf = 0; decoder->lz_errno = LZ_mem_error; }
+  return decoder;
+  }
+
+
+int LZ_decompress_close( void * const decoder )
+  {
+  if( !decoder ) return -1;
+  Decoder & d = *(Decoder *)decoder;
+  if( d.lz_decoder ) delete d.lz_decoder;
+  if( d.ibuf ) delete d.ibuf;
+  delete (Decoder *)decoder;
+  return 0;
+  }
+
+
+int LZ_decompress_finish( void * const decoder )
+  {
+  if( !verify_decoder( decoder ) ) return -1;
+  ((Decoder *)decoder)->ibuf->finish();
+  return 0;
+  }
+
+
+int LZ_decompress_read( void * const decoder, uint8_t * const buffer,
+                        const int size )
+  {
+  if( !verify_decoder( decoder ) ) return -1;
+  Decoder & d = *(Decoder *)decoder;
+  if( d.lz_decoder && d.lz_decoder->member_finished() )
+    {
+    d.partial_in_size += d.lz_decoder->member_position();
+    d.partial_out_size += d.lz_decoder->data_position();
+    delete d.lz_decoder;
+    d.lz_decoder = 0;
+    }
+  if( !d.lz_decoder )
+    {
+    if( d.ibuf->used_bytes() < 5 + (int)sizeof( File_header ) )
+      {
+      if( !d.ibuf->at_stream_end() || d.ibuf->finished() ) return 0;
+      d.ibuf->purge();
+      d.lz_errno = LZ_header_error;
+      return -1;
+      }
+    File_header header;
+    for( unsigned int i = 0; i < sizeof header; ++i )
+      ((uint8_t *)&header)[i] = d.ibuf->get_byte();
+    if( !header.verify_magic() || !header.verify_version() ||
+        header.dictionary_size() < min_dictionary_size ||
+        header.dictionary_size() > max_dictionary_size )
+      {
+      d.ibuf->purge();
+      d.lz_errno = LZ_header_error;
+      return -1;
+      }
+    try { d.lz_decoder = new LZ_decoder( header, *d.ibuf ); }
+    catch( std::bad_alloc )
+      {
+      d.ibuf->purge();
+      d.lz_decoder = 0;
+      d.lz_errno = LZ_mem_error;
+      return -1;
+      }
+    }
+  const int result = d.lz_decoder->decode_member();
+  if( result != 0 )
+    {
+    if( result == 2 ) d.lz_errno = LZ_unexpected_eof;
+    else d.lz_errno = LZ_data_error;
+    return -1;
+    }
+  return d.lz_decoder->read_data( buffer, size );
+  }
+
+
+int LZ_decompress_write( void * const decoder, uint8_t * const buffer,
+                         const int size )
+  {
+  if( !verify_decoder( decoder ) ) return -1;
+  return ((Decoder *)decoder)->ibuf->write_data( buffer, size );
+  }
+
+
+enum LZ_errno LZ_decompress_errno( void * const decoder )
+  {
+  if( !decoder ) return LZ_bad_argument;
+  return ((Decoder *)decoder)->lz_errno;
+  }
+
+
+int LZ_decompress_finished( void * const decoder )
+  {
+  if( !verify_decoder( decoder ) ) return -1;
+  Decoder & d = *(Decoder *)decoder;
+  return ( d.ibuf->finished() &&
+           ( !d.lz_decoder || d.lz_decoder->member_finished() ) );
+  }
+
+
+long long LZ_decompress_data_position( void * const decoder )
+  {
+  if( !verify_decoder( decoder ) ) return -1;
+  if( ((Decoder *)decoder)->lz_decoder )
+    return ((Decoder *)decoder)->lz_decoder->data_position();
+  else return 0;
+  }
+
+
+long long LZ_decompress_member_position( void * const decoder )
+  {
+  if( !verify_decoder( decoder ) ) return -1;
+  if( ((Decoder *)decoder)->lz_decoder )
+    return ((Decoder *)decoder)->lz_decoder->member_position();
+  else return 0;
+  }
+
+
+long long LZ_decompress_total_in_size( void * const decoder )
+  {
+  if( !verify_decoder( decoder ) ) return -1;
+  Decoder & d = *(Decoder *)decoder;
+  if( d.lz_decoder )
+    return d.partial_in_size + d.lz_decoder->member_position();
+  return d.partial_in_size;
+  }
+
+
+long long LZ_decompress_total_out_size( void * const decoder )
+  {
+  if( !verify_decoder( decoder ) ) return -1;
+  Decoder & d = *(Decoder *)decoder;
+  if( d.lz_decoder )
+    return d.partial_out_size + d.lz_decoder->data_position();
+  return d.partial_out_size;
+  }
diff --git a/lzlib.h b/lzlib.h
new file mode 100644
index 0000000..c03f7e9
--- /dev/null
+++ b/lzlib.h
@@ -0,0 +1,89 @@
+/*  Lzlib - A compression library for lzip files
+    Copyright (C) 2009 Antonio Diaz Diaz.
+
+    This library 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 3 of the License, or
+    (at your option) any later version.
+
+    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.  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/>.
+
+    As a special exception, you may use this file as part of a free
+    software library without restriction.  Specifically, if other files
+    instantiate templates or use macros or inline functions from this
+    file, or you compile this file and link it with other files to
+    produce an executable, this file does not by itself cause the
+    resulting executable to be covered by the GNU General Public
+    License.  This exception does not however invalidate any other
+    reasons why the executable file might be covered by the GNU General
+    Public License.
+*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+const char * const LZ_version_string = "0.3";
+
+enum { min_dictionary_bits = 12,
+       min_dictionary_size = 1 << min_dictionary_bits,
+       max_dictionary_bits = 29,
+       max_dictionary_size = 1 << max_dictionary_bits };
+
+enum LZ_errno { LZ_ok = 0, LZ_bad_argument, LZ_mem_error, LZ_sequence_error,
+                LZ_header_error, LZ_unexpected_eof, LZ_data_error,
+                LZ_library_error };
+
+
+const char * LZ_version( void );
+
+
+void * LZ_compress_open( const int dictionary_size, const int match_len_limit,
+                         const long long member_size );
+int LZ_compress_close( void * const encoder );
+int LZ_compress_finish( void * const encoder );
+int LZ_compress_finish_member( void * const encoder );
+int LZ_compress_restart_member( void * const encoder,
+                                const long long member_size );
+
+int LZ_compress_read( void * const encoder, uint8_t * const buffer,
+                      const int size );
+int LZ_compress_write( void * const encoder, uint8_t * const buffer,
+                       const int size );
+
+enum LZ_errno LZ_compress_errno( void * const encoder );
+int LZ_compress_finished( void * const encoder );
+int LZ_compress_member_finished( void * const encoder );
+
+long long LZ_compress_data_position( void * const encoder );
+long long LZ_compress_member_position( void * const encoder );
+long long LZ_compress_total_in_size( void * const encoder );
+long long LZ_compress_total_out_size( void * const encoder );
+
+
+void * LZ_decompress_open( void );
+int LZ_decompress_close( void * const decoder );
+int LZ_decompress_finish( void * const decoder );
+
+int LZ_decompress_read( void * const decoder, uint8_t * const buffer,
+                        const int size );
+int LZ_decompress_write( void * const decoder, uint8_t * const buffer,
+                         const int size );
+
+enum LZ_errno LZ_decompress_errno( void * const decoder );
+int LZ_decompress_finished( void * const decoder );
+
+long long LZ_decompress_data_position( void * const decoder );
+long long LZ_decompress_member_position( void * const decoder );
+long long LZ_decompress_total_in_size( void * const decoder );
+long long LZ_decompress_total_out_size( void * const decoder );
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/main.cc b/main.cc
new file mode 100644
index 0000000..ae57d92
--- /dev/null
+++ b/main.cc
@@ -0,0 +1,887 @@
+/*  Minilzip - A test program for the lzlib library
+    Copyright (C) 2009 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 3 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/>.
+*/
+/*
+    Return values: 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 lzip to panic.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <algorithm>
+#include <cerrno>
+#include <climits>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <fcntl.h>
+#include <stdint.h>
+#include <signal.h>
+#include <unistd.h>
+#include <utime.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
+#include "arg_parser.h"
+#include "lzlib.h"
+
+#ifndef LLONG_MAX
+#define LLONG_MAX  0x7FFFFFFFFFFFFFFFLL
+#endif
+#ifndef LLONG_MIN
+#define LLONG_MIN  (-LLONG_MAX - 1LL)
+#endif
+#ifndef ULLONG_MAX
+#define ULLONG_MAX 0xFFFFFFFFFFFFFFFFULL
+#endif
+
+
+namespace {
+
+const char * invocation_name = 0;
+const char * const Program_name    = "Minilzip";
+const char * const program_name    = "minilzip";
+const char * const program_year    = "2009";
+
+struct { const char * from; const char * to; } const known_extensions[] = {
+  { ".lz",  ""     },
+  { ".tlz", ".tar" },
+  { 0,      0      } };
+
+struct lzma_options
+  {
+  int dictionary_size;		// 4KiB..512MiB
+  int match_len_limit;		// 5..273
+  };
+
+enum Mode { m_compress = 0, m_decompress, m_test };
+
+std::string output_filename;
+int outhandle = -1;
+int verbosity = 0;
+bool delete_output_on_interrupt = false;
+
+class Pretty_print
+  {
+  const char * const stdin_name;
+  const unsigned int stdin_name_len;
+  unsigned int longest_name;
+  std::string name_;
+  mutable bool first_post;
+
+public:
+  Pretty_print( const std::vector< std::string > & filenames )
+    : stdin_name( "(stdin)" ), stdin_name_len( std::strlen( stdin_name ) ),
+      longest_name( 0 ), first_post( false )
+    {
+    for( unsigned int i = 0; i < filenames.size(); ++i )
+      {
+      const std::string & s = filenames[i];
+      const unsigned int len = ( ( s == "-" ) ? stdin_name_len : s.size() );
+      if( len > longest_name ) longest_name = len;
+      }
+    if( longest_name == 0 ) longest_name = stdin_name_len;
+    }
+
+  void set_name( const std::string & filename )
+    {
+    if( filename.size() && filename != "-" ) name_ = filename;
+    else name_ = stdin_name;
+    first_post = true;
+    }
+
+  void reset() const throw() { if( name_.size() ) first_post = true; }
+  const char * name() const throw() { return name_.c_str(); }
+  void operator()( const char * const msg = 0 ) const throw();
+  };
+
+
+void show_help() throw()
+  {
+  std::printf( "%s - A test program for the lzlib library.\n", Program_name );
+  std::printf( "\nUsage: %s [options] [files]\n", invocation_name );
+  std::printf( "Options:\n" );
+  std::printf( "  -h, --help                 display this help and exit\n" );
+  std::printf( "  -V, --version              output version information and exit\n" );
+  std::printf( "  -b, --member-size=<n>      set member size limit in bytes\n" );
+  std::printf( "  -c, --stdout               send output to standard output\n" );
+  std::printf( "  -d, --decompress           decompress\n" );
+  std::printf( "  -f, --force                overwrite existing output files\n" );
+  std::printf( "  -k, --keep                 keep (don't delete) input files\n" );
+  std::printf( "  -m, --match-length=<n>     set match length limit in bytes [64]\n" );
+  std::printf( "  -o, --output=<file>        if reading stdin, place the output into <file>\n" );
+  std::printf( "  -q, --quiet                suppress all messages\n" );
+  std::printf( "  -s, --dictionary-size=<n>  set dictionary size limit in bytes [8MiB]\n" );
+  std::printf( "  -S, --volume-size=<n>      set volume size limit in bytes\n" );
+  std::printf( "  -t, --test                 test compressed file integrity\n" );
+  std::printf( "  -v, --verbose              be verbose (a 2nd -v gives more)\n" );
+  std::printf( "  -1 .. -9                   set compression level [default 6]\n" );
+  std::printf( "      --fast                 alias for -1\n" );
+  std::printf( "      --best                 alias for -9\n" );
+  std::printf( "If no file names are given, %s compresses or decompresses\n", program_name );
+  std::printf( "from standard input to standard output.\n" );
+  std::printf( "Numbers may be followed by a multiplier: k = kB = 10^3 = 1000,\n" );
+  std::printf( "Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...\n" );
+  std::printf( "\nReport bugs to lzip-bug@nongnu.org\n" );
+  std::printf( "Lzip home page: http://www.nongnu.org/lzip/lzip.html\n" );
+  }
+
+
+void show_version() throw()
+  {
+  std::printf( "%s %s\n", Program_name, PROGVERSION );
+  std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
+  std::printf( "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n" );
+  std::printf( "This is free software: you are free to change and redistribute it.\n" );
+  std::printf( "There is NO WARRANTY, to the extent permitted by law.\n" );
+  }
+
+
+void show_error( const char * msg, const int errcode = 0, const bool help = false ) throw()
+  {
+  if( verbosity >= 0 )
+    {
+    if( msg && msg[0] != 0 )
+      {
+      std::fprintf( stderr, "%s: %s", program_name, msg );
+      if( errcode > 0 ) std::fprintf( stderr, ": %s", std::strerror( errcode ) );
+      std::fprintf( stderr, "\n" );
+      }
+    if( help && invocation_name && invocation_name[0] != 0 )
+      std::fprintf( stderr, "Try `%s --help' for more information.\n", invocation_name );
+    }
+  }
+
+
+void internal_error( const char * msg )
+  {
+  std::string s( "internal error: " ); s += msg;
+  show_error( s.c_str() );
+  std::exit( 3 );
+  }
+
+
+const char * format_num( long long num, long long limit = 9999,
+                         const int set_prefix = 0 ) throw()
+  {
+  const char * const si_prefix[8] =
+    { "k", "M", "G", "T", "P", "E", "Z", "Y" };
+  const char * const binary_prefix[8] =
+    { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
+  static bool si = false;
+  static char buf[16];
+
+  if( set_prefix ) si = ( set_prefix > 0 );
+  const int factor = ( si ) ? 1000 : 1024;
+  const char * const *prefix = ( si ) ? si_prefix : binary_prefix;
+  const char *p = "";
+  limit = std::max( 999LL, std::min( 999999LL, limit ) );
+
+  for( int i = 0; i < 8 && ( llabs( num ) > limit ||
+       ( llabs( num ) >= factor && num % factor == 0 ) ); ++i )
+    { num /= factor; p = prefix[i]; }
+  snprintf( buf, sizeof buf, "%lld %s", num, p );
+  return buf;
+  }
+
+
+long long getnum( const char * ptr, const int bs,
+                  const long long llimit = LLONG_MIN + 1,
+                  const long long ulimit = LLONG_MAX ) throw()
+  {
+  errno = 0;
+  char *tail;
+  long long result = strtoll( ptr, &tail, 0 );
+  if( tail == ptr )
+    {
+    show_error( "bad or missing numerical argument", 0, true );
+    std::exit( 1 );
+    }
+
+  if( !errno && tail[0] )
+    {
+    int factor = ( tail[1] == 'i' ) ? 1024 : 1000;
+    int exponent = 0;
+    bool bad_multiplier = false;
+    switch( tail[0] )
+      {
+      case ' ': break;
+      case 'b': if( bs > 0 ) { factor = bs; exponent = 1; }
+                else bad_multiplier = true;
+                break;
+      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; else bad_multiplier = true;
+                break;
+      case 'k': if( factor == 1000 ) exponent = 1; else bad_multiplier = true;
+                break;
+      default: bad_multiplier = true;
+      }
+    if( bad_multiplier )
+      {
+      show_error( "bad multiplier in numerical argument", 0, true );
+      std::exit( 1 );
+      }
+    for( int i = 0; i < exponent; ++i )
+      {
+      if( LLONG_MAX / factor >= llabs( 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;
+  }
+
+
+int get_dict_size( const char * arg ) throw()
+  {
+  char *tail;
+  int bits = std::strtol( arg, &tail, 0 );
+  if( bits >= min_dictionary_bits && bits <= max_dictionary_bits && *tail == 0 )
+    return ( 1 << bits );
+  return getnum( arg, 0, min_dictionary_size, max_dictionary_size );
+  }
+
+
+int extension_index( const std::string & name ) throw()
+  {
+  for( int i = 0; known_extensions[i].from; ++i )
+    {
+    const std::string ext( known_extensions[i].from );
+    if( name.size() > ext.size() &&
+        name.compare( name.size() - ext.size(), ext.size(), ext ) == 0 )
+      return i;
+    }
+  return -1;
+  }
+
+
+int open_instream( const std::string & name, struct stat * in_statsp,
+                   const Mode program_mode, const int eindex,
+                   const bool force, const bool to_stdout ) throw()
+  {
+  int inhandle = -1;
+  if( program_mode == m_compress && !force && eindex >= 0 )
+    {
+    if( verbosity >= 0 )
+      std::fprintf( stderr, "%s: input file `%s' already has `%s' suffix.\n",
+                    program_name, name.c_str(),
+                    known_extensions[eindex].from );
+    }
+  else
+    {
+    inhandle = open( name.c_str(), O_RDONLY );
+    if( inhandle < 0 )
+      {
+      if( verbosity >= 0 )
+        std::fprintf( stderr, "%s: Can't open input file `%s': %s.\n",
+                      program_name, name.c_str(), std::strerror( errno ) );
+      }
+    else
+      {
+      const int i = fstat( inhandle, in_statsp );
+      const mode_t & mode = in_statsp->st_mode;
+      if( i < 0 || !( S_ISREG( mode ) || ( to_stdout &&
+                      ( S_ISFIFO( mode ) || S_ISSOCK( mode ) ||
+                        S_ISBLK( mode ) || S_ISCHR( mode ) ) ) ) )
+        {
+        if( verbosity >= 0 )
+          std::fprintf( stderr, "%s: input file `%s' is not a regular file%s.\n",
+                        program_name, name.c_str(),
+                        to_stdout ? "" : " and `--stdout' was not specified" );
+        close( inhandle );
+        inhandle = -1;
+        }
+      }
+    }
+  return inhandle;
+  }
+
+
+void set_c_outname( const std::string & name, const bool multifile ) throw()
+  {
+  output_filename = name;
+  if( multifile ) output_filename += "00001";
+  output_filename += known_extensions[0].from;
+  }
+
+
+void set_d_outname( const std::string & name, const int i ) throw()
+  {
+  if( i >= 0 )
+    {
+    const std::string from( known_extensions[i].from );
+    if( name.size() > from.size() )
+      {
+      output_filename.assign( name, 0, name.size() - from.size() );
+      output_filename += known_extensions[i].to;
+      return;
+      }
+    }
+  output_filename = name; output_filename += ".out";
+  if( verbosity >= 0 )
+    std::fprintf( stderr, "%s: can't guess original name for `%s' -- using `%s'.\n",
+                  program_name, name.c_str(), output_filename.c_str() );
+  }
+
+
+bool open_outstream( const bool force ) throw()
+  {
+  if( force )
+    outhandle = open( output_filename.c_str(), O_CREAT | O_TRUNC | O_WRONLY,
+                      S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH );
+  else outhandle = open( output_filename.c_str(), O_CREAT | O_EXCL | O_WRONLY,
+                         S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH );
+  if( outhandle < 0 )
+    {
+    if( errno == EEXIST ) outhandle = -2; else outhandle = -1;
+    if( verbosity >= 0 )
+      {
+      if( outhandle == -2 )
+        std::fprintf( stderr, "%s: Output file %s already exists, skipping.\n",
+                      program_name, output_filename.c_str() );
+      else
+        std::fprintf( stderr, "%s: Can't create output file `%s': %s.\n",
+                      program_name, output_filename.c_str(), std::strerror( errno ) );
+      }
+    }
+  return ( outhandle >= 0 );
+  }
+
+
+bool check_tty( const int inhandle, const Mode program_mode ) throw()
+  {
+  if( program_mode == m_compress && isatty( outhandle ) )
+    {
+    show_error( "I won't write compressed data to a terminal.", 0, true );
+    return false;
+    }
+  if( ( program_mode == m_decompress || program_mode == m_test ) &&
+      isatty( inhandle ) )
+    {
+    show_error( "I won't read compressed data from a terminal.", 0, true );
+    return false;
+    }
+  return true;
+  }
+
+
+void cleanup_and_fail( const int retval ) throw()
+  {
+  if( delete_output_on_interrupt )
+    {
+    if( verbosity >= 0 )
+      std::fprintf( stderr, "%s: Deleting output file `%s', if it exists.\n",
+               program_name, output_filename.c_str() );
+    if( outhandle >= 0 ) { close( outhandle ); outhandle = -1; }
+    if( std::remove( output_filename.c_str() ) != 0 )
+      show_error( "WARNING: deletion of output file (apparently) failed." );
+    }
+  std::exit( retval );
+  }
+
+
+     // Set permissions, owner and times.
+void close_and_set_permissions( const struct stat * in_statsp, int * retvalp )
+  {
+  int tmp = 0;
+  if( in_statsp )
+    {
+    if( fchmod( outhandle, in_statsp->st_mode ) != 0 ) tmp = 1;
+    if( !tmp ) (void)fchown( outhandle, in_statsp->st_uid, in_statsp->st_gid );
+    // fchown will in many cases return with EPERM, which can be safely ignored.
+    }
+  if( close( outhandle ) == 0 ) outhandle = -1;
+  else cleanup_and_fail( 1 );
+  delete_output_on_interrupt = false;
+  if( !in_statsp ) return;
+  if( !tmp )
+    {
+    struct utimbuf t;
+    t.actime = in_statsp->st_atime;
+    t.modtime = in_statsp->st_mtime;
+    tmp = utime( output_filename.c_str(), &t );
+    }
+  if( tmp )
+    {
+    if( tmp > *retvalp ) *retvalp = tmp;
+    show_error( "I can't change output file attributes." );
+    cleanup_and_fail( *retvalp );
+    }
+  }
+
+
+bool next_filename()
+  {
+  const unsigned int len = std::strlen( known_extensions[0].from );
+  if( output_filename.size() >= len + 5 )		// "*00001.lz"
+    for( int i = output_filename.size() - len - 1, j = 0; j < 5; --i, ++j )
+      {
+      if( output_filename[i] < '9' ) { ++output_filename[i]; return true; }
+      else output_filename[i] = '0';
+      }
+  return false;
+  }
+
+
+// Returns the number of bytes really read.
+// If (returned value < size) and (errno == 0), means EOF was reached.
+//
+int readblock( const int fd, char * buf, const int size ) throw()
+  {
+  int rest = size;
+  errno = 0;
+  while( rest > 0 )
+    {
+    errno = 0;
+    const int n = read( fd, buf + size - rest, rest );
+    if( n > 0 ) rest -= n;
+    else if( n == 0 ) break;
+    else if( errno != EINTR && errno != EAGAIN ) break;
+    }
+  return ( rest > 0 ) ? size - rest : size;
+  }
+
+
+// Returns the number of bytes really written.
+// If (returned value < size), it is always an error.
+//
+int writeblock( const int fd, const char * buf, const int size ) throw()
+  {
+  int rest = size;
+  errno = 0;
+  while( rest > 0 )
+    {
+    errno = 0;
+    const int n = write( fd, buf + size - rest, rest );
+    if( n > 0 ) rest -= n;
+    else if( errno && errno != EINTR && errno != EAGAIN ) break;
+    }
+  return ( rest > 0 ) ? size - rest : size;
+  }
+
+
+int compress( const long long member_size, const long long volume_size,
+              lzma_options encoder_options, const int inhandle,
+              const Pretty_print & pp, const struct stat * in_statsp,
+              int * retvalp )
+  {
+  if( verbosity >= 1 ) pp();
+  void * encoder = LZ_compress_open( encoder_options.dictionary_size,
+                                     encoder_options.match_len_limit,
+                                     std::min( member_size, volume_size ) );
+  if( !encoder || LZ_compress_errno( encoder ) != LZ_ok )
+    {
+    const bool mem_error = ( LZ_compress_errno( encoder ) == LZ_mem_error );
+    LZ_compress_close( encoder );
+    if( mem_error )
+      { pp( "not enough memory. Try a smaller dictionary size" ); return 1; }
+    internal_error( "invalid argument to encoder" );
+    }
+
+  long long partial_volume_size = 0;
+  const int out_buffer_size = 65536, in_buffer_size = 8 * out_buffer_size;
+  uint8_t in_buffer[in_buffer_size], out_buffer[out_buffer_size];
+  int in_pos = 0, in_stream_pos = 0;
+  while( true )
+    {
+    if( in_stream_pos == 0 )
+      {
+      in_stream_pos = readblock( inhandle, (char *)in_buffer, in_buffer_size );
+      if( in_stream_pos == 0 ) LZ_compress_finish( encoder );
+      }
+    int in_size = 0;
+    if( in_pos < in_stream_pos )
+      {
+      in_size = LZ_compress_write( encoder, in_buffer + in_pos, in_stream_pos - in_pos );
+      in_pos += in_size;
+      if( in_pos >= in_stream_pos ) { in_stream_pos = 0; in_pos = 0; }
+      }
+    int out_size = LZ_compress_read( encoder, out_buffer, out_buffer_size );
+//    std::fprintf( stderr, "%6d in_size, %5d out_size.\n", in_size, out_size );
+    if( out_size < 0 )
+      { pp(); show_error( "read error", errno ); return 1; }
+    else if( out_size > 0 )
+      {
+      const int wr = writeblock( outhandle, (char *)out_buffer, out_size );
+      if( wr != out_size )
+        { pp(); show_error( "write error", errno ); return 1; }
+      }
+    else if( in_size == 0 ) internal_error( "library error" );
+    if( LZ_compress_member_finished( encoder ) )
+      {
+      if( LZ_compress_finished( encoder ) == 1 ) break;
+      partial_volume_size += LZ_compress_member_position( encoder );
+      if( partial_volume_size >= volume_size - min_dictionary_size )
+        {
+        partial_volume_size = 0;
+        if( delete_output_on_interrupt )
+          {
+          close_and_set_permissions( in_statsp, retvalp );
+          if( !next_filename() )
+            { pp(); show_error( "too many volume files" ); return 1; }
+          if( !open_outstream( true ) ) return 1;
+          delete_output_on_interrupt = true;
+          }
+        }
+      const long long size =
+        std::min( member_size, volume_size - partial_volume_size );
+      if( LZ_compress_restart_member( encoder, size ) < 0 )
+        { pp(); show_error( "read error", errno ); return 1; }
+      }
+    }
+
+  if( verbosity >= 1 )
+    {
+    const long long in_size = LZ_compress_total_in_size( encoder );
+    const long long out_size = LZ_compress_total_out_size( encoder );
+    if( in_size <= 0 || out_size <= 0 )
+      std::fprintf( stderr, "no data compressed.\n" );
+    else
+      std::fprintf( stderr, "%6.3f:1, %6.3f bits/byte, "
+                            "%5.2f%% saved, %lld in, %lld out.\n",
+                    (double)in_size / out_size,
+                    ( 8.0 * out_size ) / in_size,
+                    100.0 * ( 1.0 - ( (double)out_size / in_size ) ),
+                    in_size, out_size );
+    }
+  LZ_compress_close( encoder );
+  return 0;
+  }
+
+
+int decompress( const int inhandle, const Pretty_print & pp,
+                const bool testing )
+  {
+  void * decoder = LZ_decompress_open();
+  if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
+    {
+    LZ_decompress_close( decoder );
+    pp( "not enough memory. Find a machine with more memory" );
+    return 1;
+    }
+  if( verbosity >= 1 ) pp();
+
+  const int in_buffer_size = 65536, out_buffer_size = 8 * in_buffer_size;
+  uint8_t in_buffer[in_buffer_size], out_buffer[out_buffer_size];
+  int in_pos = 0, in_stream_pos = 0;
+  bool finished = false;
+  while( true )
+    {
+    int in_size = 0;
+    if( !finished )
+      {
+      if( in_stream_pos == 0 )
+        in_stream_pos = readblock( inhandle, (char *)in_buffer, in_buffer_size );
+      if( in_pos < in_stream_pos )
+        {
+        in_size = LZ_decompress_write( decoder, in_buffer + in_pos, in_stream_pos - in_pos );
+        in_pos += in_size;
+        }
+      if( in_pos >= in_stream_pos )
+        {
+        if( in_stream_pos < in_buffer_size )
+          { finished = true; LZ_decompress_finish( decoder ); }
+        in_stream_pos = 0; in_pos = 0;
+        }
+      }
+    int out_size = LZ_decompress_read( decoder, out_buffer, out_buffer_size );
+//    std::fprintf( stderr, "%5d in_size, %6d out_size.\n", in_size, out_size );
+    if( out_size < 0 )
+      {
+      const LZ_errno lz_errno = LZ_decompress_errno( decoder );
+      if( lz_errno == LZ_header_error )
+        {
+        if( LZ_decompress_total_out_size( decoder ) > 0 )  // trailing garbage
+          break;
+        pp( "error reading member header" );
+        return 1;
+        }
+      if( lz_errno == LZ_mem_error )
+        {
+        pp( "not enough memory. Find a machine with more memory" );
+        return 1;
+        }
+      if( lz_errno == LZ_unexpected_eof )
+        {
+        if( verbosity >= 0 )
+          { pp();
+            std::fprintf( stderr, "file ends unexpectedly at pos %lld\n",
+                          LZ_decompress_total_in_size( decoder ) ); }
+        return 2;
+        }
+      pp(); show_error( "read error", errno ); return 1;
+      }
+    else if( out_size > 0 )
+      {
+      const int wr = writeblock( outhandle, (char *)out_buffer, out_size );
+      if( wr != out_size )
+        { pp(); show_error( "write error", errno ); return 1; }
+      }
+    if( LZ_decompress_finished( decoder ) == 1 ) break;
+    if( finished && in_size == 0 && out_size == 0 )
+      internal_error( "library error" );
+    }
+  if( verbosity >= 1 )
+    { if( testing ) std::fprintf( stderr, "ok\n" );
+      else std::fprintf( stderr, "done\n" ); }
+  LZ_decompress_close( decoder );
+  return 0;
+  }
+
+
+void signal_handler( const int ) throw()
+  {
+  show_error( "Control-C or similar caught, quitting." );
+  cleanup_and_fail( 0 );
+  }
+
+
+void set_signals() throw()
+  {
+  signal( SIGTERM, signal_handler );
+  signal( SIGHUP, signal_handler );
+  signal( SIGINT, signal_handler );
+  }
+
+} // end namespace
+
+
+void Pretty_print::operator()( const char * const msg ) const throw()
+  {
+  if( verbosity >= 0 )
+    {
+    if( first_post )
+      {
+      first_post = false;
+      std::fprintf( stderr, "  %s: ", name_.c_str() );
+      for( unsigned int i = 0; i < longest_name - name_.size(); ++i )
+        std::fprintf( stderr, " " );
+      if( !msg ) std::fflush( stderr );
+      }
+    if( msg ) std::fprintf( stderr, "%s.\n", msg );
+    }
+  }
+
+
+int main( const int argc, const char * argv[] )
+  {
+  // Mapping from gzip/bzip2 style 1..9 compression modes
+  // to the corresponding LZMA compression modes.
+  const lzma_options option_mapping[] =
+    {
+    { 1 << 22,  10 },		// -1
+    { 1 << 22,  12 },		// -2
+    { 1 << 22,  17 },		// -3
+    { 1 << 22,  26 },		// -4
+    { 1 << 22,  44 },		// -5
+    { 1 << 23,  80 },		// -6
+    { 1 << 24, 108 },		// -7
+    { 1 << 24, 163 },		// -8
+    { 1 << 25, 273 } };		// -9
+  lzma_options encoder_options = option_mapping[5];	// default = "-6"
+  long long member_size = LLONG_MAX;
+  long long volume_size = LLONG_MAX;
+  int inhandle = -1;
+  Mode program_mode = m_compress;
+  bool force = false;
+  bool keep_input_files = false;
+  bool to_stdout = false;
+  std::string input_filename;
+  std::string default_output_filename;
+  std::vector< std::string > filenames;
+  invocation_name = argv[0];
+
+  if( LZ_version()[0] != LZ_version_string[0] )
+    internal_error( "bad library version" );
+
+  if( std::strcmp( PROGVERSION, LZ_version_string ) )
+    internal_error( "bad library version_string" );
+
+  const Arg_parser::Option options[] =
+    {
+    { '1', "fast",            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', "best",            Arg_parser::no  },
+    { 'b', "member-size",     Arg_parser::yes },
+    { 'c', "stdout",          Arg_parser::no  },
+    { 'd', "decompress",      Arg_parser::no  },
+    { 'f', "force",           Arg_parser::no  },
+    { 'h', "help",            Arg_parser::no  },
+    { 'k', "keep",            Arg_parser::no  },
+    { 'm', "match-length",    Arg_parser::yes },
+    { 'o', "output",          Arg_parser::yes },
+    { 'q', "quiet",           Arg_parser::no  },
+    { 's', "dictionary-size", Arg_parser::yes },
+    { 'S', "volume-size",     Arg_parser::yes },
+    { 't', "test",            Arg_parser::no  },
+    { 'v', "verbose",         Arg_parser::no  },
+    { 'V', "version",         Arg_parser::no  },
+    {  0 ,  0,                Arg_parser::no  } };
+
+  Arg_parser parser( argc, argv, options );
+  if( parser.error().size() )				// bad option
+    { show_error( parser.error().c_str(), 0, true ); return 1; }
+
+  int argind = 0;
+  for( ; argind < parser.arguments(); ++argind )
+    {
+    const int code = parser.code( argind );
+    if( !code ) break;					// no more options
+    const char * arg = parser.argument( argind ).c_str();
+    switch( code )
+      {
+      case '1': case '2': case '3':
+      case '4': case '5': case '6':
+      case '7': case '8': case '9':
+                encoder_options = option_mapping[code-'1']; break;
+      case 'b': member_size = getnum( arg, 0, 100000, LLONG_MAX / 2 ); break;
+      case 'c': to_stdout = true; break;
+      case 'd': program_mode = m_decompress; break;
+      case 'f': force = true; break;
+      case 'h': show_help(); return 0;
+      case 'k': keep_input_files = true; break;
+      case 'm': encoder_options.match_len_limit =
+                getnum( arg, 0, 5, 273 ); break;
+      case 'o': default_output_filename = arg; break;
+      case 'q': verbosity = -1; break;
+      case 's': encoder_options.dictionary_size = get_dict_size( arg );
+                break;
+      case 'S': volume_size = getnum( arg, 0, 100000, LLONG_MAX / 2 ); break;
+      case 't': program_mode = m_test; break;
+      case 'v': if( verbosity < 4 ) ++verbosity; break;
+      case 'V': show_version(); return 0;
+      default : internal_error( "uncaught option" );
+      }
+    }
+
+  bool filenames_given = false;
+  for( ; argind < parser.arguments(); ++argind )
+    {
+    if( parser.argument( argind ) != "-" ) filenames_given = true;
+    filenames.push_back( parser.argument( argind ) );
+    }
+
+  if( filenames.empty() ) filenames.push_back("-");
+  if( filenames_given ) set_signals();
+
+  Pretty_print pp( filenames );
+  if( program_mode == m_test )
+    {
+    output_filename = "/dev/null";
+    if( !open_outstream( true ) ) return 1;
+    }
+
+  int retval = 0;
+  for( unsigned int i = 0; i < filenames.size(); ++i )
+    {
+    struct stat in_stats;
+    output_filename.clear();
+
+    if( !filenames[i].size() || filenames[i] == "-" )
+      {
+      input_filename.clear();
+      inhandle = STDIN_FILENO;
+      if( program_mode != m_test )
+        {
+        if( to_stdout || !default_output_filename.size() )
+          outhandle = STDOUT_FILENO;
+        else
+          {
+          if( program_mode == m_compress )
+            set_c_outname( default_output_filename, volume_size != LLONG_MAX );
+          else output_filename = default_output_filename;
+          if( !open_outstream( force ) )
+            {
+            if( outhandle == -1 && retval < 1 ) retval = 1;
+            close( inhandle ); inhandle = -1;
+            continue;
+            }
+          }
+        }
+      }
+    else
+      {
+      input_filename = filenames[i];
+      const int eindex = extension_index( input_filename );
+      inhandle = open_instream( input_filename, &in_stats, program_mode,
+                                eindex, force, to_stdout );
+      if( inhandle < 0 ) continue;
+      if( program_mode != m_test )
+        {
+        if( to_stdout ) outhandle = STDOUT_FILENO;
+        else
+          {
+          if( program_mode == m_compress )
+            set_c_outname( input_filename, volume_size != LLONG_MAX );
+          else set_d_outname( input_filename, eindex );
+          if( !open_outstream( force ) )
+            {
+            if( outhandle == -1 && retval < 1 ) retval = 1;
+            close( inhandle ); inhandle = -1;
+            continue;
+            }
+          }
+        }
+      }
+
+    if( !check_tty( inhandle, program_mode ) ) return 1;
+
+    if( output_filename.size() && !to_stdout && program_mode != m_test )
+      delete_output_on_interrupt = true;
+    const struct stat * in_statsp = input_filename.size() ? &in_stats : 0;
+    pp.set_name( input_filename );
+    int tmp = 0;
+    if( program_mode == m_compress )
+      tmp = compress( member_size, volume_size, encoder_options, inhandle,
+                      pp, in_statsp, &retval );
+    else
+      tmp = decompress( inhandle, pp, program_mode == m_test );
+    if( tmp > retval ) retval = tmp;
+    if( tmp && program_mode != m_test ) cleanup_and_fail( retval );
+
+    if( delete_output_on_interrupt )
+      close_and_set_permissions( in_statsp, &retval );
+    if( input_filename.size() )
+      {
+      close( inhandle ); inhandle = -1;
+      if( !keep_input_files && !to_stdout && program_mode != m_test )
+        std::remove( input_filename.c_str() );
+      }
+    }
+  if( outhandle >= 0 ) close( outhandle );
+  return retval;
+  }
diff --git a/testsuite/COPYING.lz b/testsuite/COPYING.lz
new file mode 100644
index 0000000..a09b1e8
--- /dev/null
+++ b/testsuite/COPYING.lz
diff --git a/testsuite/check.sh b/testsuite/check.sh
new file mode 100755
index 0000000..b4ee42f
--- /dev/null
+++ b/testsuite/check.sh
@@ -0,0 +1,67 @@
+#! /bin/sh
+# check script for Lzlib - A compression library for lzip files
+# Copyright (C) 2009 Antonio Diaz Diaz.
+#
+# This script is free software: you have unlimited permission
+# to copy, distribute and modify it.
+
+objdir=`pwd`
+testdir=`cd "$1" ; pwd`
+LZIP="${objdir}"/minilzip
+framework_failure() { echo 'failure in testing framework'; exit 1; }
+
+if [ ! -x "${LZIP}" ] ; then
+	echo "${LZIP}: cannot execute"
+	exit 1
+fi
+
+if [ -d tmp ] ; then rm -r tmp ; fi
+mkdir tmp
+echo -n "testing minilzip..."
+cd "${objdir}"/tmp
+
+cat "${testdir}"/../COPYING > in || framework_failure
+fail=0
+
+"${LZIP}" -cd "${testdir}"/COPYING.lz > copy || fail=1
+cmp in copy || fail=1
+
+for i in 1 2 3 4 5 6 7 8 9; do
+	"${LZIP}" -k -$i in || fail=1
+	mv -f in.lz copy.lz || fail=1
+	echo -n "garbage" >> copy.lz || fail=1
+	"${LZIP}" -df copy.lz || fail=1
+	cmp in copy || fail=1
+	echo -n .
+done
+
+for i in 1 2 3 4 5 6 7 8 9; do
+	"${LZIP}" -c -$i in > out || fail=1
+	echo -n "g" >> out || fail=1
+	"${LZIP}" -cd out > copy || fail=1
+	cmp in copy || fail=1
+	echo -n .
+done
+
+for i in 1 2 3 4 5 6 7 8 9; do
+	"${LZIP}" -c -$i < in > out || fail=1
+	"${LZIP}" -d < out > copy || fail=1
+	cmp in copy || fail=1
+	echo -n .
+done
+
+for i in 1 2 3 4 5 6 7 8 9; do
+	"${LZIP}" -f -$i -o out < in || fail=1
+	"${LZIP}" -df -o copy < out.lz || fail=1
+	cmp in copy || fail=1
+	echo -n .
+done
+
+echo
+if test ${fail} = 0; then
+	echo "tests completed successfully."
+	if cd "${objdir}" ; then rm -r tmp ; fi
+else
+	echo "tests failed."
+fi
+exit ${fail}
author	Daniel Baumann <mail@daniel-baumann.ch>	2015-11-07 13:32:21 +0000
committer	Daniel Baumann <mail@daniel-baumann.ch>	2015-11-07 13:32:21 +0000
commit	a061471f450a2efc60371f90ac9483c8ed4375fd (patch)
tree	640c3865c87f5e32bf0e98aac1edb0221c96c39c
parent	Initial commit. (diff)
download	lzlib-a061471f450a2efc60371f90ac9483c8ed4375fd.tar.xz lzlib-a061471f450a2efc60371f90ac9483c8ed4375fd.zip