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authorDaniel Baumann <mail@daniel-baumann.ch>2015-11-07 10:15:36 +0000
committerDaniel Baumann <mail@daniel-baumann.ch>2015-11-07 10:15:36 +0000
commitd313f09b6c5ba39aa4569bbcceffab475b7edbfb (patch)
tree254d28fea0f549b0ff596b255d177cc023f9ce39
parentInitial commit. (diff)
downloadlziprecover-d313f09b6c5ba39aa4569bbcceffab475b7edbfb.tar.xz
lziprecover-d313f09b6c5ba39aa4569bbcceffab475b7edbfb.zip
Adding upstream version 1.13~rc1.upstream/1.13_rc1
Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
Diffstat (limited to '')
-rw-r--r--AUTHORS1
-rw-r--r--COPYING676
-rw-r--r--ChangeLog55
-rw-r--r--INSTALL57
-rw-r--r--Makefile.in111
-rw-r--r--NEWS10
-rw-r--r--README34
-rw-r--r--arg_parser.cc203
-rw-r--r--arg_parser.h105
-rwxr-xr-xconfigure192
-rw-r--r--decoder.cc310
-rw-r--r--decoder.h268
-rw-r--r--doc/lziprecover.171
-rw-r--r--doc/lziprecover.info368
-rw-r--r--doc/lziprecover.texinfo397
-rw-r--r--lzip.h323
-rw-r--r--main.cc676
-rw-r--r--merge.cc406
-rw-r--r--repair.cc114
-rw-r--r--split.cc176
-rwxr-xr-xtestsuite/check.sh103
-rw-r--r--testsuite/test.txt676
-rw-r--r--testsuite/test_bad1.lzbin0 -> 11548 bytes
-rw-r--r--testsuite/test_bad2.lzbin0 -> 11548 bytes
-rw-r--r--testsuite/test_bad3.lzbin0 -> 11548 bytes
-rw-r--r--testsuite/test_bad4.lzbin0 -> 11548 bytes
-rw-r--r--testsuite/test_bad5.lzbin0 -> 11548 bytes
-rw-r--r--testsuite/test_v0.lzbin0 -> 11540 bytes
-rw-r--r--testsuite/test_v1.lzbin0 -> 11548 bytes
29 files changed, 5332 insertions, 0 deletions
diff --git a/AUTHORS b/AUTHORS
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index 0000000..e6cadef
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1 @@
+Lziprecover was written by Antonio Diaz Diaz.
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..4432540
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,676 @@
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+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+ 14. Revised Versions of this License.
+
+ The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+ Each version is given a distinguishing version number. If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+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..15e7746
--- /dev/null
+++ b/ChangeLog
@@ -0,0 +1,55 @@
+2011-11-12 Antonio Diaz Diaz <ant_diaz@teleline.es>
+
+ * Version 1.13-rc1 released.
+ * Lziprecover is now distributed in its own package. Until
+ version 1.12 it was included in the lzip package.
+ * lziprecover.cc: Renamed to main.cc.
+ * main.cc: Added decompressor options (-c, -d, -k, -t) so that
+ a external decompressor is not needed for recovery nor for
+ "make check".
+ * New files merge.cc, repair.cc and split.cc.
+ * merge.cc repair.cc: Remove output file if recovery fails.
+ * split.cc: Use Boyer-Moore algorithm to search for headers.
+ * testsuite/check.sh: Use `ln' instead of `cat' for input files.
+
+2011-04-30 Antonio Diaz Diaz <ant_diaz@teleline.es>
+
+ * Version 1.12 released.
+ * lziprecover.cc: If `-v' is not specified show errors only.
+
+2010-09-16 Antonio Diaz Diaz <ant_diaz@teleline.es>
+
+ * Version 1.11 released.
+ * lziprecover.cc: Added new option `-m, --merge' which tries to
+ produce a correct file merging the good parts of two or more
+ damaged copies.
+ * lziprecover.cc: Added new option `-R, --repair' for repairing
+ a 1-byte error in single-member files.
+ * decoder.cc (decode_member): Detect file errors earlier to
+ improve efficiency of lziprecover's new repair capability.
+ This change also prevents (harmless) access to uninitialized
+ memory when decompressing a corrupt file.
+ * lziprecover.cc: Added new option `-f, --force'.
+ * lziprecover.cc: Added new option `-o, --output'.
+ * lziprecover.cc: Added new option `-s, --split' to select the
+ until now only operation of splitting multimember files.
+ * lziprecover.cc: If no operation is specified, warn the user
+ and do nothing.
+
+2009-06-22 Antonio Diaz Diaz <ant_diaz@teleline.es>
+
+ * Version 1.6 released.
+ * Added man page for lziprecover.
+ * testsuite/check.sh: Test lziprecover.
+
+2009-01-24 Antonio Diaz Diaz <ant_diaz@teleline.es>
+
+ * Version 1.4 released.
+ * Added `lziprecover', a member recoverer program.
+
+
+Copyright (C) 2009, 2010, 2011 Antonio Diaz Diaz.
+
+This file is a collection of facts, and thus it is not copyrightable,
+but just in case, you have unlimited permission to copy, distribute and
+modify it.
diff --git a/INSTALL b/INSTALL
new file mode 100644
index 0000000..c2a3dcc
--- /dev/null
+++ b/INSTALL
@@ -0,0 +1,57 @@
+Requirements
+------------
+You will need a C++ compiler.
+I use gcc 4.3.5 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 lziprecover[version].tar.lz | tar -xf -
+or
+ gzip -cd lziprecover[version].tar.gz | tar -xf -
+
+This creates the directory ./lziprecover[version] containing the source
+from the main archive.
+
+2. Change to lziprecover directory and run configure.
+ (Try `configure --help' for usage instructions).
+
+ cd lziprecover[version]
+ ./configure
+
+3. Run make.
+
+ make
+
+4. Optionally, type `make check' to run the tests that come with
+ lziprecover.
+
+5. Type `make install' to install the programs and any data files and
+ documentation.
+
+
+Another way
+-----------
+You can also compile lziprecover 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, 2010, 2011 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..6c12f88
--- /dev/null
+++ b/Makefile.in
@@ -0,0 +1,111 @@
+
+DISTNAME = $(pkgname)-$(pkgversion)
+INSTALL = install
+INSTALL_PROGRAM = $(INSTALL) -p -m 755
+INSTALL_DATA = $(INSTALL) -p -m 644
+INSTALL_DIR = $(INSTALL) -d -m 755
+SHELL = /bin/sh
+
+objs = arg_parser.o decoder.o merge.o repair.o split.o main.o
+
+
+.PHONY : all install install-info install-man install-strip \
+ uninstall uninstall-info uninstall-man \
+ doc info man check dist clean distclean
+
+all : $(progname)
+
+$(progname) : $(objs)
+ $(CXX) $(LDFLAGS) -o $@ $(objs)
+
+$(progname)_profiled : $(objs)
+ $(CXX) $(LDFLAGS) -pg -o $@ $(objs)
+
+main.o : main.cc
+ $(CXX) $(CPPFLAGS) $(CXXFLAGS) -DPROGVERSION=\"$(pkgversion)\" -c -o $@ $<
+
+%.o : %.cc
+ $(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
+
+$(objs) : Makefile
+arg_parser.o : arg_parser.h
+decoder.o : lzip.h decoder.h
+main.o : arg_parser.h lzip.h decoder.h
+merge.o : lzip.h decoder.h
+repair.o : lzip.h
+split.o : lzip.h
+
+
+doc : info man
+
+info : $(VPATH)/doc/$(pkgname).info
+
+$(VPATH)/doc/$(pkgname).info : $(VPATH)/doc/$(pkgname).texinfo
+ cd $(VPATH)/doc && makeinfo $(pkgname).texinfo
+
+man : $(VPATH)/doc/$(progname).1
+
+$(VPATH)/doc/$(progname).1 : $(progname)
+ help2man -n 'recovers data from damaged lzip files' \
+ -o $@ ./$(progname)
+
+Makefile : $(VPATH)/configure $(VPATH)/Makefile.in
+ ./config.status
+
+check : all
+ @$(VPATH)/testsuite/check.sh $(VPATH)/testsuite $(pkgversion)
+
+install : all install-info install-man
+ if [ ! -d "$(DESTDIR)$(bindir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(bindir)" ; fi
+ $(INSTALL_PROGRAM) ./$(progname) "$(DESTDIR)$(bindir)/$(progname)"
+
+install-info :
+ if [ ! -d "$(DESTDIR)$(infodir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(infodir)" ; fi
+ $(INSTALL_DATA) $(VPATH)/doc/$(pkgname).info "$(DESTDIR)$(infodir)/$(pkgname).info"
+ -install-info --info-dir="$(DESTDIR)$(infodir)" $(DESTDIR)$(infodir)/$(pkgname).info
+
+install-man :
+ if [ ! -d "$(DESTDIR)$(mandir)/man1" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(mandir)/man1" ; fi
+ $(INSTALL_DATA) $(VPATH)/doc/$(progname).1 "$(DESTDIR)$(mandir)/man1/$(progname).1"
+
+install-strip : all
+ $(MAKE) INSTALL_PROGRAM='$(INSTALL_PROGRAM) -s' install
+
+uninstall : uninstall-info uninstall-man
+ -rm -f "$(DESTDIR)$(bindir)/$(progname)"
+
+uninstall-info :
+ -install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$(pkgname).info"
+ -rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"
+
+uninstall-man :
+ -rm -f "$(DESTDIR)$(mandir)/man1/$(progname).1"
+
+dist : doc
+ 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 \
+ $(DISTNAME)/doc/$(progname).1 \
+ $(DISTNAME)/doc/$(pkgname).info \
+ $(DISTNAME)/doc/$(pkgname).texinfo \
+ $(DISTNAME)/testsuite/check.sh \
+ $(DISTNAME)/testsuite/test.txt \
+ $(DISTNAME)/testsuite/test_bad[1-5].lz \
+ $(DISTNAME)/testsuite/test_v[01].lz \
+ $(DISTNAME)/*.h \
+ $(DISTNAME)/*.cc
+ rm -f $(DISTNAME)
+ lzip -v -9 $(DISTNAME).tar
+
+clean :
+ -rm -f $(progname) $(progname)_profiled $(objs)
+
+distclean : clean
+ -rm -f Makefile config.status *.tar *.tar.lz
diff --git a/NEWS b/NEWS
new file mode 100644
index 0000000..12d88ed
--- /dev/null
+++ b/NEWS
@@ -0,0 +1,10 @@
+Changes in version 1.13:
+
+Lziprecover is now distributed in its own package. Until version 1.12 it
+was included in the lzip package.
+
+Decompressor options (-c, -d, -k, -t) have been implemented in
+lziprecover so that a external decompressor is not needed for recovery
+nor for "make check".
+
+"--merge" and "--repair" now remove the output file if recovery fails.
diff --git a/README b/README
new file mode 100644
index 0000000..7d390e6
--- /dev/null
+++ b/README
@@ -0,0 +1,34 @@
+Description
+
+Lziprecover is a data recovery tool and decompressor for files in the
+lzip compressed data format (.lz) able to repair slightly damaged files,
+recover badly damaged files from two or more copies, extract undamaged
+members from multi-member files, decompress files and test integrity of
+files.
+
+Lziprecover is able to recover or decompress files produced by any of
+the compressors in the lzip family; lzip, plzip, minilzip/lzlib, clzip
+and pdlzip. This recovery capability contributes to make the lzip format
+one of the best options for long-term data archiving.
+
+When recovering data, lziprecover takes as arguments the names of the
+damaged files and writes zero or more recovered files depending on the
+operation selected and whether the recovery succeeded or not. The
+damaged files themselves are never modified.
+
+When decompressing or testing file integrity, lziprecover behaves like
+lzip or lunzip.
+
+If the files are too damaged for lziprecover to repair them, data from
+damaged members can be partially recovered writing it to stdout.
+
+To give you an idea of its possibilities, when merging two copies each
+of them with one damaged area affecting 1 percent of the copy, the
+probability of obtaining a correct file is about 98 percent. With three
+such copies the probability rises to 99.97 percent. For large files with
+small errors, the probability approaches 100 percent even with only two
+copies.
+
+If the cause of file corruption is damaged media, the combination
+GNU ddrescue + lziprecover is the best option for recovering data from
+multiple damaged copies.
diff --git a/arg_parser.cc b/arg_parser.cc
new file mode 100644
index 0000000..bc4b4a3
--- /dev/null
+++ b/arg_parser.cc
@@ -0,0 +1,203 @@
+/* Arg_parser - POSIX/GNU command line argument parser. (C++ version)
+ Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 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 library. 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 <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..d1e5c02
--- /dev/null
+++ b/arg_parser.h
@@ -0,0 +1,105 @@
+/* Arg_parser - POSIX/GNU command line argument parser. (C++ version)
+ Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 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 library. 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.
+*/
+
+/* 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..43bf621
--- /dev/null
+++ b/configure
@@ -0,0 +1,192 @@
+#! /bin/sh
+# configure script for Lziprecover - Data recovery tool for lzipped files
+# Copyright (C) 2009, 2010, 2011 Antonio Diaz Diaz.
+#
+# This configure script is free software: you have unlimited permission
+# to copy, distribute and modify it.
+
+args=
+no_create=
+pkgname=lziprecover
+pkgversion=1.13-rc1
+progname=lziprecover
+srctrigger=lzip.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'
+infodir='$(datadir)/info'
+mandir='$(datadir)/man'
+sysconfdir='$(prefix)/etc'
+CXX=
+CPPFLAGS=
+CXXFLAGS='-Wall -W -O2'
+LDFLAGS=
+
+# Loop over all args
+while [ -n "$1" ] ; 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 [${datadir}]"
+ echo " --infodir=DIR info files directory [${infodir}]"
+ echo " --mandir=DIR man pages directory [${mandir}]"
+ echo " --sysconfdir=DIR read-only single-machine data directory [${sysconfdir}]"
+ echo " CXX=COMPILER C++ compiler to use [g++]"
+ echo " CPPFLAGS=OPTIONS command line options for the preprocessor [${CPPFLAGS}]"
+ echo " CXXFLAGS=OPTIONS command line options for the C++ compiler [${CXXFLAGS}]"
+ echo " LDFLAGS=OPTIONS command line options for the linker [${LDFLAGS}]"
+ echo
+ exit 0 ;;
+ --version | --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 ${optarg} | sed -e 's,/$,,'` ;;
+ --infodir* | --inf*)
+ infodir=`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 ;;
+
+ CXX=*) CXX=${optarg} ;;
+ CPPFLAGS=*) CPPFLAGS=${optarg} ;;
+ CXXFLAGS=*) CXXFLAGS=${optarg} ;;
+ LDFLAGS=*) LDFLAGS=${optarg} ;;
+
+ --* | *=* | *-*-*) ;;
+ *)
+ echo "configure: Unrecognized option: \"${option}\"; use --help for usage." 1>&2
+ exit 1 ;;
+ esac
+done
+
+# Find the source files, if location was not specified.
+srcdirtext=
+if [ -z "${srcdir}" ] ; then
+ srcdirtext="or . or .." ; srcdir=.
+ if [ ! -r ${srcdir}/${srctrigger} ] ; then srcdir=.. ; fi
+ if [ ! -r ${srcdir}/${srctrigger} ] ; then
+ ## the sed command below emulates the dirname command
+ srcdir=`echo $0 | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
+ fi
+fi
+
+if [ ! -r ${srcdir}/${srctrigger} ] ; then
+ 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 ${srcdir} ; pwd`" ] ; then srcdir=. ; fi
+
+# checking whether we are using GNU C++.
+if [ -z "${CXX}" ] ; 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 [ -z "${no_create}" ] ; then
+ echo "creating config.status"
+ rm -f config.status
+ cat > config.status << EOF
+#! /bin/sh
+# This file was generated automatically by configure. 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 $0 ${args} --no-create
+EOF
+ chmod +x config.status
+fi
+
+echo "creating Makefile"
+echo "VPATH = ${srcdir}"
+echo "prefix = ${prefix}"
+echo "exec_prefix = ${exec_prefix}"
+echo "bindir = ${bindir}"
+echo "datadir = ${datadir}"
+echo "infodir = ${infodir}"
+echo "mandir = ${mandir}"
+echo "sysconfdir = ${sysconfdir}"
+echo "CXX = ${CXX}"
+echo "CPPFLAGS = ${CPPFLAGS}"
+echo "CXXFLAGS = ${CXXFLAGS}"
+echo "LDFLAGS = ${LDFLAGS}"
+rm -f Makefile
+cat > Makefile << EOF
+# Makefile for Lziprecover - Data recovery tool for lzipped files
+# Copyright (C) 2009, 2010, 2011 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}
+progname = ${progname}
+VPATH = ${srcdir}
+prefix = ${prefix}
+exec_prefix = ${exec_prefix}
+bindir = ${bindir}
+datadir = ${datadir}
+infodir = ${infodir}
+mandir = ${mandir}
+sysconfdir = ${sysconfdir}
+CXX = ${CXX}
+CPPFLAGS = ${CPPFLAGS}
+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..b9fc3d8
--- /dev/null
+++ b/decoder.cc
@@ -0,0 +1,310 @@
+/* Lziprecover - Data recovery tool for lzipped files
+ Copyright (C) 2009, 2010, 2011 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/>.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <algorithm>
+#include <cerrno>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <stdint.h>
+#include <unistd.h>
+
+#include "lzip.h"
+#include "decoder.h"
+
+
+const CRC32 crc32;
+
+
+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 );
+ }
+ }
+
+
+// Returns the number of bytes really read.
+// If (returned value < size) and (errno == 0), means EOF was reached.
+//
+int readblock( const int fd, uint8_t * const buf, const int size ) 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 uint8_t * const 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;
+ }
+
+
+bool Range_decoder::read_block()
+ {
+ if( !at_stream_end )
+ {
+ stream_pos = readblock( infd, buffer, buffer_size );
+ if( stream_pos != buffer_size && errno ) throw Error( "Read error" );
+ at_stream_end = ( stream_pos < buffer_size );
+ partial_member_pos += pos;
+ pos = 0;
+ }
+ return pos < stream_pos;
+ }
+
+
+void LZ_decoder::flush_data()
+ {
+ const int size = pos - stream_pos;
+ if( size > 0 )
+ {
+ crc32.update( crc_, buffer + stream_pos, size );
+ if( outfd >= 0 &&
+ writeblock( outfd, buffer + stream_pos, size ) != size )
+ throw Error( "Write error" );
+ if( pos >= buffer_size ) { partial_data_pos += pos; pos = 0; }
+ stream_pos = pos;
+ }
+ }
+
+
+bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
+ {
+ File_trailer trailer;
+ const int trailer_size = File_trailer::size( member_version );
+ const long long member_size = range_decoder.member_position() + trailer_size;
+ bool error = false;
+
+ for( int i = 0; i < trailer_size && !error; ++i )
+ {
+ if( !range_decoder.finished() )
+ trailer.data[i] = range_decoder.get_byte();
+ else
+ {
+ error = true;
+ if( pp.verbosity() >= 0 )
+ {
+ pp();
+ std::fprintf( stderr, "Trailer truncated at trailer position %d;"
+ " some checks may fail.\n", i );
+ }
+ for( ; i < trailer_size; ++i ) trailer.data[i] = 0;
+ }
+ }
+ if( member_version == 0 ) trailer.member_size( member_size );
+ if( !range_decoder.code_is_zero() )
+ {
+ error = true;
+ pp( "Range decoder final code is not zero" );
+ }
+ if( trailer.data_crc() != crc() )
+ {
+ error = true;
+ if( pp.verbosity() >= 0 )
+ {
+ pp();
+ std::fprintf( stderr, "CRC mismatch; trailer says %08X, data CRC is %08X.\n",
+ (unsigned int)trailer.data_crc(), (unsigned int)crc() );
+ }
+ }
+ if( trailer.data_size() != data_position() )
+ {
+ error = true;
+ if( pp.verbosity() >= 0 )
+ {
+ pp();
+ std::fprintf( stderr, "Data size mismatch; trailer says %lld, data size is %lld (0x%llX).\n",
+ trailer.data_size(), data_position(), data_position() );
+ }
+ }
+ if( trailer.member_size() != member_size )
+ {
+ error = true;
+ if( pp.verbosity() >= 0 )
+ {
+ pp();
+ std::fprintf( stderr, "Member size mismatch; trailer says %lld, member size is %lld (0x%llX).\n",
+ trailer.member_size(), member_size, member_size );
+ }
+ }
+ if( !error && pp.verbosity() >= 3 && data_position() > 0 && member_size > 0 )
+ std::fprintf( stderr, "%6.3f:1, %6.3f bits/byte, %5.2f%% saved. ",
+ (double)data_position() / member_size,
+ ( 8.0 * member_size ) / data_position(),
+ 100.0 * ( 1.0 - ( (double)member_size / data_position() ) ) );
+ if( !error && pp.verbosity() >= 4 )
+ std::fprintf( stderr, "data CRC %08X, data size %9lld, member size %8lld. ",
+ (unsigned int)trailer.data_crc(), trailer.data_size(),
+ trailer.member_size() );
+ return !error;
+ }
+
+
+// Return value: 0 = OK, 1 = decoder error, 2 = unexpected EOF,
+// 3 = trailer error, 4 = unknown marker found.
+int LZ_decoder::decode_member( const Pretty_print & pp )
+ {
+ 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+1];
+ Bit_model bm_align[dis_align_size];
+
+ unsigned int rep0 = 0; // rep[0-3] latest four distances
+ unsigned int rep1 = 0; // used for efficient coding of
+ unsigned int rep2 = 0; // repeated distances
+ unsigned int rep3 = 0;
+
+ Len_decoder len_decoder;
+ Len_decoder rep_match_len_decoder;
+ Literal_decoder literal_decoder;
+ State state;
+ range_decoder.load();
+
+ while( true )
+ {
+ if( range_decoder.finished() ) { flush_data(); return 2; }
+ const int pos_state = data_position() & pos_state_mask;
+ if( range_decoder.decode_bit( bm_match[state()][pos_state] ) == 0 )
+ {
+ const uint8_t prev_byte = get_prev_byte();
+ if( state.is_char() )
+ put_byte( literal_decoder.decode( range_decoder, prev_byte ) );
+ else
+ put_byte( literal_decoder.decode_matched( range_decoder, prev_byte,
+ get_byte( rep0 ) ) );
+ 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()] ) == 1 )
+ {
+ 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;
+ }
+ else
+ {
+ if( range_decoder.decode_bit( bm_len[state()][pos_state] ) == 0 )
+ { state.set_short_rep(); len = 1; }
+ }
+ if( len == 0 )
+ {
+ state.set_rep();
+ len = min_match_len + rep_match_len_decoder.decode( range_decoder, pos_state );
+ }
+ }
+ else
+ {
+ const unsigned int rep0_saved = rep0;
+ len = min_match_len + len_decoder.decode( range_decoder, pos_state );
+ 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 == 0xFFFFFFFFU ) // Marker found
+ {
+ rep0 = rep0_saved;
+ range_decoder.normalize();
+ flush_data();
+ if( len == min_match_len ) // End Of Stream marker
+ {
+ if( verify_trailer( pp ) ) return 0; else return 3;
+ }
+ if( len == min_match_len + 1 ) // Sync Flush marker
+ {
+ range_decoder.load(); continue;
+ }
+ if( pp.verbosity() >= 0 )
+ {
+ pp();
+ std::fprintf( stderr, "Unsupported marker code `%d'.\n", len );
+ }
+ return 4;
+ }
+ }
+ }
+ rep3 = rep2; rep2 = rep1; rep1 = rep0_saved;
+ state.set_match();
+ if( rep0 >= (unsigned int)dictionary_size ||
+ ( rep0 >= (unsigned int)pos && !partial_data_pos ) )
+ { flush_data(); return 1; }
+ }
+ copy_block( rep0, len );
+ }
+ }
+ }
diff --git a/decoder.h b/decoder.h
new file mode 100644
index 0000000..3b5dc7d
--- /dev/null
+++ b/decoder.h
@@ -0,0 +1,268 @@
+/* Lziprecover - Data recovery tool for lzipped files
+ Copyright (C) 2009, 2010, 2011 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/>.
+*/
+
+class Range_decoder
+ {
+ enum { buffer_size = 16384 };
+ long long partial_member_pos;
+ uint8_t * const buffer; // input buffer
+ int pos; // current pos in buffer
+ int stream_pos; // when reached, a new block must be read
+ uint32_t code;
+ uint32_t range;
+ const int infd; // input file descriptor
+ bool at_stream_end;
+
+ bool read_block();
+
+public:
+ Range_decoder( const int ifd )
+ :
+ partial_member_pos( 0 ),
+ buffer( new uint8_t[buffer_size] ),
+ pos( 0 ),
+ stream_pos( 0 ),
+ code( 0 ),
+ range( 0xFFFFFFFFU ),
+ infd( ifd ),
+ at_stream_end( false ) {}
+
+ ~Range_decoder() { delete[] buffer; }
+
+ bool code_is_zero() const throw() { return ( code == 0 ); }
+ bool finished() { return pos >= stream_pos && !read_block(); }
+ long long member_position() const throw()
+ { return partial_member_pos + pos; }
+ void reset_member_position() throw()
+ { partial_member_pos = -pos; }
+
+ uint8_t get_byte()
+ {
+ if( finished() ) return 0x55; // make code != 0
+ return buffer[pos++];
+ }
+
+ void load()
+ {
+ code = 0;
+ range = 0xFFFFFFFFU;
+ for( int i = 0; i < 5; ++i ) code = (code << 8) | get_byte();
+ }
+
+ void normalize()
+ {
+ if( range <= 0x00FFFFFFU )
+ { range <<= 8; code = (code << 8) | get_byte(); }
+ }
+
+ int decode( const int num_bits )
+ {
+ int symbol = 0;
+ for( int i = num_bits; i > 0; --i )
+ {
+ symbol <<= 1;
+ if( range <= 0x00FFFFFFU )
+ {
+ range <<= 7; code = (code << 8) | get_byte();
+ if( code >= range ) { code -= range; symbol |= 1; }
+ }
+ else
+ {
+ range >>= 1;
+ if( code >= range ) { code -= range; symbol |= 1; }
+ }
+ }
+ return symbol;
+ }
+
+ int decode_bit( Bit_model & bm )
+ {
+ normalize();
+ 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;
+ return 0;
+ }
+ else
+ {
+ range -= bound;
+ code -= bound;
+ bm.probability -= bm.probability >> bit_model_move_bits;
+ return 1;
+ }
+ }
+
+ 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] );
+ 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 = 0; i < num_bits; ++i )
+ {
+ const int bit = decode_bit( bm[model] );
+ model <<= 1;
+ if( bit ) { model |= 1; symbol |= (1 << i); }
+ }
+ return symbol;
+ }
+
+ int decode_matched( Bit_model bm[], const int match_byte )
+ {
+ Bit_model * const bm1 = bm + 0x100;
+ int symbol = 1;
+ for( int i = 7; i >= 0; --i )
+ {
+ const int match_bit = ( match_byte >> i ) & 1;
+ const int bit = decode_bit( bm1[(match_bit<<8)+symbol] );
+ symbol = ( symbol << 1 ) | bit;
+ if( match_bit != bit )
+ {
+ while( --i >= 0 )
+ symbol = ( symbol << 1 ) | decode_bit( bm[symbol] );
+ break;
+ }
+ }
+ 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 lstate( const int prev_byte ) const throw()
+ { return ( prev_byte >> ( 8 - literal_context_bits ) ); }
+
+public:
+ uint8_t decode( Range_decoder & range_decoder, const uint8_t prev_byte )
+ { return range_decoder.decode_tree( bm_literal[lstate(prev_byte)], 8 ); }
+
+ uint8_t decode_matched( Range_decoder & range_decoder,
+ const uint8_t prev_byte, const uint8_t match_byte )
+ { return range_decoder.decode_matched( bm_literal[lstate(prev_byte)],
+ match_byte ); }
+ };
+
+
+class LZ_decoder
+ {
+ long long partial_data_pos;
+ const int dictionary_size;
+ const int buffer_size;
+ uint8_t * const buffer; // output buffer
+ int pos; // current pos in buffer
+ int stream_pos; // first byte not yet written to file
+ uint32_t crc_;
+ const int outfd; // output file descriptor
+ const int member_version;
+ Range_decoder & range_decoder;
+
+ void flush_data();
+ bool verify_trailer( const Pretty_print & pp ) const;
+
+ uint8_t get_prev_byte() const throw()
+ {
+ const int i = ( ( pos > 0 ) ? pos : buffer_size ) - 1;
+ return buffer[i];
+ }
+
+ uint8_t get_byte( const int distance ) const throw()
+ {
+ int i = pos - distance - 1;
+ if( i < 0 ) i += buffer_size;
+ return buffer[i];
+ }
+
+ void put_byte( const uint8_t b )
+ {
+ buffer[pos] = b;
+ if( ++pos >= buffer_size ) flush_data();
+ }
+
+ void copy_block( const int distance, int len )
+ {
+ int i = pos - distance - 1;
+ if( i < 0 ) i += buffer_size;
+ if( len < buffer_size - std::max( pos, i ) && len <= std::abs( pos - i ) )
+ {
+ std::memcpy( buffer + pos, buffer + i, len );
+ pos += len;
+ }
+ else for( ; len > 0; --len )
+ {
+ buffer[pos] = buffer[i];
+ if( ++pos >= buffer_size ) flush_data();
+ if( ++i >= buffer_size ) i = 0;
+ }
+ }
+
+public:
+ LZ_decoder( const File_header & header, Range_decoder & rdec, const int ofd )
+ :
+ partial_data_pos( 0 ),
+ dictionary_size( header.dictionary_size() ),
+ buffer_size( std::max( 65536, dictionary_size ) ),
+ buffer( new uint8_t[buffer_size] ),
+ pos( 0 ),
+ stream_pos( 0 ),
+ crc_( 0xFFFFFFFFU ),
+ outfd( ofd ),
+ member_version( header.version() ),
+ range_decoder( rdec )
+ { buffer[buffer_size-1] = 0; } // prev_byte of first_byte
+
+ ~LZ_decoder() { delete[] buffer; }
+
+ uint32_t crc() const throw() { return crc_ ^ 0xFFFFFFFFU; }
+
+ long long data_position() const throw()
+ { return partial_data_pos + pos; }
+
+ int decode_member( const Pretty_print & pp );
+ };
diff --git a/doc/lziprecover.1 b/doc/lziprecover.1
new file mode 100644
index 0000000..495de0b
--- /dev/null
+++ b/doc/lziprecover.1
@@ -0,0 +1,71 @@
+.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.37.1.
+.TH LZIPRECOVER "1" "November 2011" "Lziprecover 1.13-rc1" "User Commands"
+.SH NAME
+Lziprecover \- recovers data from damaged lzip files
+.SH SYNOPSIS
+.B lziprecover
+[\fIoptions\fR] [\fIfiles\fR]
+.SH DESCRIPTION
+Lziprecover \- Data recovery tool and decompressor for lzipped files.
+.SH OPTIONS
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+display this help and exit
+.TP
+\fB\-V\fR, \fB\-\-version\fR
+output version information and exit
+.TP
+\fB\-c\fR, \fB\-\-stdout\fR
+send decompressed output to standard output
+.TP
+\fB\-d\fR, \fB\-\-decompress\fR
+decompress
+.TP
+\fB\-f\fR, \fB\-\-force\fR
+overwrite existing output files
+.TP
+\fB\-k\fR, \fB\-\-keep\fR
+keep (don't delete) input files
+.TP
+\fB\-m\fR, \fB\-\-merge\fR
+correct errors in file using several copies
+.TP
+\fB\-o\fR, \fB\-\-output=\fR<file>
+place the output into <file>
+.TP
+\fB\-q\fR, \fB\-\-quiet\fR
+suppress all messages
+.TP
+\fB\-R\fR, \fB\-\-repair\fR
+try to repair a small error in file
+.TP
+\fB\-s\fR, \fB\-\-split\fR
+split a multimember file in single\-member files
+.TP
+\fB\-t\fR, \fB\-\-test\fR
+test compressed file integrity
+.TP
+\fB\-v\fR, \fB\-\-verbose\fR
+be verbose (a 2nd \fB\-v\fR gives more)
+.SH "REPORTING BUGS"
+Report bugs to lzip\-bug@nongnu.org
+.br
+Lziprecover home page: http://www.nongnu.org/lzip/lziprecover.html
+.SH COPYRIGHT
+Copyright \(co 2011 Antonio Diaz Diaz.
+License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
+.br
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+.SH "SEE ALSO"
+The full documentation for
+.B Lziprecover
+is maintained as a Texinfo manual. If the
+.B info
+and
+.B Lziprecover
+programs are properly installed at your site, the command
+.IP
+.B info Lziprecover
+.PP
+should give you access to the complete manual.
diff --git a/doc/lziprecover.info b/doc/lziprecover.info
new file mode 100644
index 0000000..4528103
--- /dev/null
+++ b/doc/lziprecover.info
@@ -0,0 +1,368 @@
+This is lziprecover.info, produced by makeinfo version 4.13 from
+lziprecover.texinfo.
+
+INFO-DIR-SECTION Data Compression
+START-INFO-DIR-ENTRY
+* Lziprecover: (lziprecover). Data recovery tool for lzipped files
+END-INFO-DIR-ENTRY
+
+
+File: lziprecover.info, Node: Top, Next: Introduction, Up: (dir)
+
+Lziprecover Manual
+******************
+
+This manual is for Lziprecover (version 1.13-rc1, 12 November 2011).
+
+* Menu:
+
+* Introduction:: Purpose and features of lziprecover
+* Invoking Lziprecover:: Command line interface
+* File Format:: Detailed format of the compressed file
+* Examples:: A small tutorial with examples
+* Problems:: Reporting bugs
+* Concept Index:: Index of concepts
+
+
+ Copyright (C) 2009, 2010, 2011 Antonio Diaz Diaz.
+
+ This manual is free documentation: you have unlimited permission to
+copy, distribute and modify it.
+
+
+File: lziprecover.info, Node: Introduction, Next: Invoking Lziprecover, Prev: Top, Up: Top
+
+1 Introduction
+**************
+
+Lziprecover is a data recovery tool and decompressor for files in the
+lzip compressed data format (.lz) able to repair slightly damaged files,
+recover badly damaged files from two or more copies, extract undamaged
+members from multi-member files, decompress files and test integrity of
+files.
+
+ Lziprecover is able to recover or decompress files produced by any of
+the compressors in the lzip family; lzip, plzip, minilzip/lzlib, clzip
+and pdlzip. This recovery capability contributes to make the lzip format
+one of the best options for long-term data archiving.
+
+ When recovering data, lziprecover takes as arguments the names of the
+damaged files and writes zero or more recovered files depending on the
+operation selected and whether the recovery succeeded or not. The
+damaged files themselves are never modified.
+
+ When decompressing or testing file integrity, lziprecover behaves
+like lzip or lunzip.
+
+ If the files are too damaged for lziprecover to repair them, data
+from damaged members can be partially recovered writing it to stdout as
+shown in the following example (the resulting file may contain some
+garbage data at the end):
+
+ lziprecover -cd rec00001file.lz > rec00001file
+
+ If the cause of file corruption is damaged media, the combination
+GNU ddrescue + lziprecover is the best option for recovering data from
+multiple damaged copies. *Note ddrescue-example::, for an example.
+
+ 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 lziprecover to panic.
+
+
+File: lziprecover.info, Node: Invoking Lziprecover, Next: File Format, Prev: Introduction, Up: Top
+
+2 Invoking Lziprecover
+**********************
+
+The format for running lziprecover is:
+
+ lziprecover [OPTIONS] [FILES]
+
+ Lziprecover supports the following options:
+
+`-h'
+`--help'
+ Print an informative help message describing the options and exit.
+
+`-V'
+`--version'
+ Print the version number of lziprecover on the standard output and
+ exit.
+
+`-c'
+`--stdout'
+ Decompress to standard output. Needed when reading from a named
+ pipe (fifo) or from a device. Use it to recover as much of the
+ uncompressed data as possible when decompressing a corrupt file.
+
+`-d'
+`--decompress'
+ Decompress.
+
+`-f'
+`--force'
+ Force overwrite of output files.
+
+`-k'
+`--keep'
+ Keep (don't delete) input files during decompression.
+
+`-m'
+`--merge'
+ Try to produce a correct file merging the good parts of two or more
+ damaged copies. The copies must be single-member files. The merge
+ will fail if the copies have too many damaged areas or if the same
+ byte is damaged in all copies. If successful, a repaired copy is
+ written to the file `FILE_fixed.lz'. The exit status is 0 if the
+ file could be repaired, 2 otherwise.
+
+ To give you an idea of its possibilities, when merging two copies
+ each of them with one damaged area affecting 1 percent of the
+ copy, the probability of obtaining a correct file is about 98
+ percent. With three such copies the probability rises to 99.97
+ percent. For large files with small errors, the probability
+ approaches 100 percent even with only two copies.
+
+`-o FILE'
+`--output=FILE'
+ Place the output into `FILE' instead of into `FILE_fixed.lz'. If
+ splitting, the names of the files produced are in the form
+ `rec00001FILE', `rec00002FILE', etc. If decompressing from
+ standard input and `--stdout' has not been specified, use `FILE'
+ as the name of the decompressed file.
+
+`-q'
+`--quiet'
+ Quiet operation. Suppress all messages.
+
+`-R'
+`--repair'
+ Try to repair a small error, affecting only one byte, in a
+ single-member FILE. If successful, a repaired copy is written to
+ the file `FILE_fixed.lz'. `FILE' is not modified at all. The exit
+ status is 0 if the file could be repaired, 2 otherwise.
+
+`-s'
+`--split'
+ Search for members in `FILE' and write each member in its own
+ `.lz' file. You can then use `lziprecover -t' to test the
+ integrity of the resulting files, decompress those which are
+ undamaged, and try to repair or partially decompress those which
+ are damaged.
+
+ The names of the files produced are in the form `rec00001FILE.lz',
+ `rec00002FILE.lz', etc, and are designed so that the use of
+ wildcards in subsequent processing, for example,
+ `lziprecover -cd rec*FILE.lz > recovered_data', processes the
+ files in the correct order.
+
+`-t'
+`--test'
+ Check integrity of the specified file(s), but don't decompress
+ them. This really performs a trial decompression and throws away
+ the result. Use it together with `-v' to see information about
+ the file.
+
+`-v'
+`--verbose'
+ Verbose mode.
+ When decompressing or testing, further -v's (up to 4) increase the
+ verbosity level, showing status, dictionary size, compression
+ ratio, trailer contents (CRC, data size, member size), and up to 6
+ bytes of trailing garbage (if any).
+
+
+
+File: lziprecover.info, Node: File Format, Next: Examples, Prev: Invoking Lziprecover, Up: Top
+
+3 File 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 file consists of a series of "members" (compressed data sets).
+The members simply appear one after another in the file, 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 lzip format, 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 are deprecated. They can
+ contain only one member and lack the `Member size' field.
+
+`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: lziprecover.info, Node: Examples, Next: Problems, Prev: File Format, Up: Top
+
+4 A small tutorial with examples
+********************************
+
+Example 1: Restore a regular file from its compressed version
+`file.lz'. If the operation is successful, `file.lz' is removed.
+
+ lziprecover -d file.lz
+
+
+Example 2: Verify the integrity of the compressed file `file.lz' and
+show status.
+
+ lziprecover -tv file.lz
+
+
+Example 3: Decompress `file.lz' partially until 10KiB of decompressed
+data are produced.
+
+ lziprecover -cd file.lz | dd bs=1024 count=10
+
+
+Example 4: Decompress `file.lz' partially from decompressed byte 10000
+to decompressed byte 15000 (5000 bytes are produced).
+
+ lziprecover -cd file.lz | dd bs=1000 skip=10 count=5
+
+
+Example 5: Repair a one-byte corruption in the single-member file
+`file.lz'. (Indented lines are abridged error messages from
+lziprecover).
+
+ lziprecover -v -R file.lz
+ Copy of input file repaired successfully.
+ mv file_fixed.lz file.lz
+
+
+Example 6: Split the multi-member file `file.lz' and write each member
+in its own `recXXXXXfile.lz' file. Then use `lziprecover -t' to test
+the integrity of the resulting files.
+
+ lziprecover -s file.lz
+ lziprecover -tv rec*file.lz
+
+
+Example 7: Recover a compressed backup from two copies on CD-ROM (see
+the GNU ddrescue manual for details about ddrescue)
+
+ ddrescue -b2048 /dev/cdrom cdimage1 logfile1
+ mount -t iso9660 -o loop,ro cdimage1 /mnt/cdimage
+ cp /mnt/cdimage/backup.tar.lz rescued1.tar.lz
+ umount /mnt/cdimage
+ (insert second copy in the CD drive)
+ ddrescue -b2048 /dev/cdrom cdimage2 logfile2
+ mount -t iso9660 -o loop,ro cdimage2 /mnt/cdimage
+ cp /mnt/cdimage/backup.tar.lz rescued2.tar.lz
+ umount /mnt/cdimage
+ lziprecover -m -v -o rescued.tar.lz rescued1.tar.lz rescued2.tar.lz
+
+
+Example 8: Recover the first volume of those created with the command
+`lzip -b 32MiB -S 650MB big_db' from two copies, `big_db1_00001.lz' and
+`big_db2_00001.lz', with member 00007 damaged in the first copy, member
+00018 damaged in the second copy, and member 00012 damaged in both
+copies. Two correct copies are produced and compared.
+
+ lziprecover -s big_db1_00001.lz
+ lziprecover -s big_db2_00001.lz
+ lziprecover -t rec*big_db1_00001.lz
+ rec00007big_db1_00001.lz: crc mismatch
+ rec00012big_db1_00001.lz: crc mismatch
+ lziprecover -t rec*big_db2_00001.lz
+ rec00012big_db2_00001.lz: crc mismatch
+ rec00018big_db2_00001.lz: crc mismatch
+ lziprecover -m -v rec00012big_db1_00001.lz rec00012big_db2_00001.lz
+ Input files merged successfully
+ cp rec00007big_db2_00001.lz rec00007big_db1_00001.lz
+ cp rec00012big_db1_00001_fixed.lz rec00012big_db1_00001.lz
+ cp rec00012big_db1_00001_fixed.lz rec00012big_db2_00001.lz
+ cp rec00018big_db1_00001.lz rec00018big_db2_00001.lz
+ cat rec*big_db1_00001.lz > big_db3_00001.lz
+ cat rec*big_db2_00001.lz > big_db4_00001.lz
+ zcmp big_db3_00001.lz big_db4_00001.lz
+
+
+File: lziprecover.info, Node: Problems, Next: Concept Index, Prev: Examples, Up: Top
+
+5 Reporting Bugs
+****************
+
+There are probably bugs in lziprecover. 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 lziprecover, please send electronic mail to
+<lzip-bug@nongnu.org>. Include the version number, which you can find
+by running `lziprecover --version'.
+
+
+File: lziprecover.info, Node: Concept Index, Prev: Problems, Up: Top
+
+Concept Index
+*************
+
+
+* Menu:
+
+* bugs: Problems. (line 6)
+* examples: Examples. (line 6)
+* file format: File Format. (line 6)
+* getting help: Problems. (line 6)
+* introduction: Introduction. (line 6)
+* invoking lziprecover: Invoking Lziprecover. (line 6)
+
+
+
+Tag Table:
+Node: Top231
+Node: Introduction898
+Node: Invoking Lziprecover2684
+Node: File Format6150
+Node: Examples8156
+Ref: ddrescue-example9409
+Node: Problems11188
+Node: Concept Index11738
+
+End Tag Table
diff --git a/doc/lziprecover.texinfo b/doc/lziprecover.texinfo
new file mode 100644
index 0000000..2447c14
--- /dev/null
+++ b/doc/lziprecover.texinfo
@@ -0,0 +1,397 @@
+\input texinfo @c -*-texinfo-*-
+@c %**start of header
+@setfilename lziprecover.info
+@settitle Lziprecover Manual
+@finalout
+@c %**end of header
+
+@set UPDATED 12 November 2011
+@set VERSION 1.13-rc1
+
+@dircategory Data Compression
+@direntry
+* Lziprecover: (lziprecover). Data recovery tool for lzipped files
+@end direntry
+
+
+@ifnothtml
+@titlepage
+@title Lziprecover
+@subtitle Data recovery tool for lzipped files
+@subtitle for Lziprecover version @value{VERSION}, @value{UPDATED}
+@author by Antonio Diaz Diaz
+
+@page
+@vskip 0pt plus 1filll
+@end titlepage
+
+@contents
+@end ifnothtml
+
+@node Top
+@top
+
+This manual is for Lziprecover (version @value{VERSION}, @value{UPDATED}).
+
+@menu
+* Introduction:: Purpose and features of lziprecover
+* Invoking Lziprecover:: Command line interface
+* File Format:: Detailed format of the compressed file
+* Examples:: A small tutorial with examples
+* Problems:: Reporting bugs
+* Concept Index:: Index of concepts
+@end menu
+
+@sp 1
+Copyright @copyright{} 2009, 2010, 2011 Antonio Diaz Diaz.
+
+This manual is free documentation: you have unlimited permission
+to copy, distribute and modify it.
+
+
+@node Introduction
+@chapter Introduction
+@cindex introduction
+
+Lziprecover is a data recovery tool and decompressor for files in the
+lzip compressed data format (.lz) able to repair slightly damaged files,
+recover badly damaged files from two or more copies, extract undamaged
+members from multi-member files, decompress files and test integrity of
+files.
+
+Lziprecover is able to recover or decompress files produced by any of
+the compressors in the lzip family; lzip, plzip, minilzip/lzlib, clzip
+and pdlzip. This recovery capability contributes to make the lzip format
+one of the best options for long-term data archiving.
+
+When recovering data, lziprecover takes as arguments the names of the
+damaged files and writes zero or more recovered files depending on the
+operation selected and whether the recovery succeeded or not. The
+damaged files themselves are never modified.
+
+When decompressing or testing file integrity, lziprecover behaves like
+lzip or lunzip.
+
+If the files are too damaged for lziprecover to repair them, data from
+damaged members can be partially recovered writing it to stdout as shown
+in the following example (the resulting file may contain some garbage
+data at the end):
+
+@example
+lziprecover -cd rec00001file.lz > rec00001file
+@end example
+
+If the cause of file corruption is damaged media, the combination
+@w{GNU ddrescue + lziprecover} is the best option for recovering data
+from multiple damaged copies. @xref{ddrescue-example}, for an example.
+
+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 lziprecover to panic.
+
+
+@node Invoking Lziprecover
+@chapter Invoking Lziprecover
+@cindex invoking lziprecover
+
+The format for running lziprecover is:
+
+@example
+lziprecover [@var{options}] [@var{files}]
+@end example
+
+Lziprecover supports the following options:
+
+@table @samp
+@item -h
+@itemx --help
+Print an informative help message describing the options and exit.
+
+@item -V
+@itemx --version
+Print the version number of lziprecover on the standard output and exit.
+
+@item -c
+@itemx --stdout
+Decompress to standard output. Needed when reading from a named pipe
+(fifo) or from a device. Use it to recover as much of the uncompressed
+data as possible when decompressing a corrupt file.
+
+@item -d
+@itemx --decompress
+Decompress.
+
+@item -f
+@itemx --force
+Force overwrite of output files.
+
+@item -k
+@itemx --keep
+Keep (don't delete) input files during decompression.
+
+@item -m
+@itemx --merge
+Try to produce a correct file merging the good parts of two or more
+damaged copies. The copies must be single-member files. The merge will
+fail if the copies have too many damaged areas or if the same byte is
+damaged in all copies. If successful, a repaired copy is written to the
+file @samp{@var{file}_fixed.lz}. The exit status is 0 if the file could
+be repaired, 2 otherwise.
+
+To give you an idea of its possibilities, when merging two copies each
+of them with one damaged area affecting 1 percent of the copy, the
+probability of obtaining a correct file is about 98 percent. With three
+such copies the probability rises to 99.97 percent. For large files with
+small errors, the probability approaches 100 percent even with only two
+copies.
+
+@item -o @var{file}
+@itemx --output=@var{file}
+Place the output into @samp{@var{file}} instead of into
+@samp{@var{file}_fixed.lz}. If splitting, the names of the files
+produced are in the form @samp{rec00001@var{file}},
+@samp{rec00002@var{file}}, etc. If decompressing from standard input and
+@samp{--stdout} has not been specified, use @samp{@var{file}} as the
+name of the decompressed file.
+
+@item -q
+@itemx --quiet
+Quiet operation. Suppress all messages.
+
+@item -R
+@itemx --repair
+Try to repair a small error, affecting only one byte, in a single-member
+@var{file}. If successful, a repaired copy is written to the file
+@samp{@var{file}_fixed.lz}. @samp{@var{file}} is not modified at all.
+The exit status is 0 if the file could be repaired, 2 otherwise.
+
+@item -s
+@itemx --split
+Search for members in @samp{@var{file}} and write each member in its own
+@samp{.lz} file. You can then use @samp{lziprecover -t} to test the
+integrity of the resulting files, decompress those which are undamaged,
+and try to repair or partially decompress those which are damaged.
+
+The names of the files produced are in the form
+@samp{rec00001@var{file}.lz}, @samp{rec00002@var{file}.lz}, etc, and are
+designed so that the use of wildcards in subsequent processing, for
+example, @w{@samp{lziprecover -cd rec*@var{file}.lz > recovered_data}},
+processes the files in the correct order.
+
+@item -t
+@itemx --test
+Check integrity of the specified file(s), but don't decompress them.
+This really performs a trial decompression and throws away the result.
+Use it together with @samp{-v} to see information about the file.
+
+@item -v
+@itemx --verbose
+Verbose mode.@*
+When decompressing or testing, further -v's (up to 4) increase the
+verbosity level, showing status, dictionary size, compression ratio,
+trailer contents (CRC, data size, member size), and up to 6 bytes of
+trailing garbage (if any).
+
+@end table
+
+
+@node File Format
+@chapter File Format
+@cindex file 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 file consists of a series of "members" (compressed data sets).
+The members simply appear one after another in the file, 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 lzip format, 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 are deprecated. They can contain only one
+member and lack the @samp{Member size} field.
+
+@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
+
+Example 1: Restore a regular file from its compressed version
+@samp{file.lz}. If the operation is successful, @samp{file.lz} is
+removed.
+
+@example
+lziprecover -d file.lz
+@end example
+
+@sp 1
+@noindent
+Example 2: Verify the integrity of the compressed file @samp{file.lz}
+and show status.
+
+@example
+lziprecover -tv file.lz
+@end example
+
+@sp 1
+@noindent
+Example 3: Decompress @samp{file.lz} partially until 10KiB of
+decompressed data are produced.
+
+@example
+lziprecover -cd file.lz | dd bs=1024 count=10
+@end example
+
+@sp 1
+@noindent
+Example 4: Decompress @samp{file.lz} partially from decompressed byte
+10000 to decompressed byte 15000 (5000 bytes are produced).
+
+@example
+lziprecover -cd file.lz | dd bs=1000 skip=10 count=5
+@end example
+
+@sp 1
+@noindent
+Example 5: Repair a one-byte corruption in the single-member file
+@samp{file.lz}. (Indented lines are abridged error messages from
+lziprecover).
+
+@example
+lziprecover -v -R file.lz
+ Copy of input file repaired successfully.
+mv file_fixed.lz file.lz
+@end example
+
+@sp 1
+@noindent
+Example 6: Split the multi-member file @samp{file.lz} and write each
+member in its own @samp{recXXXXXfile.lz} file. Then use
+@w{@samp{lziprecover -t}} to test the integrity of the resulting files.
+
+@example
+lziprecover -s file.lz
+lziprecover -tv rec*file.lz
+@end example
+
+@sp 1
+@anchor{ddrescue-example}
+@noindent
+Example 7: Recover a compressed backup from two copies on CD-ROM (see
+the GNU ddrescue manual for details about ddrescue)
+
+@example
+ddrescue -b2048 /dev/cdrom cdimage1 logfile1
+mount -t iso9660 -o loop,ro cdimage1 /mnt/cdimage
+cp /mnt/cdimage/backup.tar.lz rescued1.tar.lz
+umount /mnt/cdimage
+ (insert second copy in the CD drive)
+ddrescue -b2048 /dev/cdrom cdimage2 logfile2
+mount -t iso9660 -o loop,ro cdimage2 /mnt/cdimage
+cp /mnt/cdimage/backup.tar.lz rescued2.tar.lz
+umount /mnt/cdimage
+lziprecover -m -v -o rescued.tar.lz rescued1.tar.lz rescued2.tar.lz
+@end example
+
+@sp 1
+@noindent
+Example 8: Recover the first volume of those created with the command
+@w{@code{lzip -b 32MiB -S 650MB big_db}} from two copies,
+@samp{big_db1_00001.lz} and @samp{big_db2_00001.lz}, with member 00007
+damaged in the first copy, member 00018 damaged in the second copy, and
+member 00012 damaged in both copies. Two correct copies are produced and
+compared.
+
+@example
+lziprecover -s big_db1_00001.lz
+lziprecover -s big_db2_00001.lz
+lziprecover -t rec*big_db1_00001.lz
+ rec00007big_db1_00001.lz: crc mismatch
+ rec00012big_db1_00001.lz: crc mismatch
+lziprecover -t rec*big_db2_00001.lz
+ rec00012big_db2_00001.lz: crc mismatch
+ rec00018big_db2_00001.lz: crc mismatch
+lziprecover -m -v rec00012big_db1_00001.lz rec00012big_db2_00001.lz
+ Input files merged successfully
+cp rec00007big_db2_00001.lz rec00007big_db1_00001.lz
+cp rec00012big_db1_00001_fixed.lz rec00012big_db1_00001.lz
+cp rec00012big_db1_00001_fixed.lz rec00012big_db2_00001.lz
+cp rec00018big_db1_00001.lz rec00018big_db2_00001.lz
+cat rec*big_db1_00001.lz > big_db3_00001.lz
+cat rec*big_db2_00001.lz > big_db4_00001.lz
+zcmp big_db3_00001.lz big_db4_00001.lz
+@end example
+
+
+@node Problems
+@chapter Reporting Bugs
+@cindex bugs
+@cindex getting help
+
+There are probably bugs in lziprecover. 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 lziprecover, please send electronic mail to
+@email{lzip-bug@@nongnu.org}. Include the version number, which you can
+find by running @w{@samp{lziprecover --version}}.
+
+
+@node Concept Index
+@unnumbered Concept Index
+
+@printindex cp
+
+@bye
diff --git a/lzip.h b/lzip.h
new file mode 100644
index 0000000..440ce71
--- /dev/null
+++ b/lzip.h
@@ -0,0 +1,323 @@
+/* Lziprecover - Data recovery tool for lzipped files
+ Copyright (C) 2009, 2010, 2011 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/>.
+*/
+
+class State
+ {
+ unsigned char st;
+
+public:
+ enum { states = 12 };
+ State() throw() : st( 0 ) {}
+ unsigned char 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];
+ }
+ };
+
+
+enum {
+ min_dictionary_bits = 12,
+ min_dictionary_size = 1 << min_dictionary_bits,
+ max_dictionary_bits = 29,
+ max_dictionary_size = 1 << max_dictionary_bits,
+ literal_context_bits = 3,
+ pos_state_bits = 2,
+ pos_states = 1 << pos_state_bits,
+ pos_state_mask = pos_states - 1,
+
+ dis_slot_bits = 6,
+ start_dis_model = 4,
+ end_dis_model = 14,
+ modeled_distances = 1 << (end_dis_model / 2),
+ dis_align_bits = 4,
+ dis_align_size = 1 << dis_align_bits,
+
+ len_low_bits = 3,
+ len_mid_bits = 3,
+ len_high_bits = 8,
+ len_low_symbols = 1 << len_low_bits,
+ len_mid_symbols = 1 << len_mid_bits,
+ len_high_symbols = 1 << len_high_bits,
+ max_len_symbols = len_low_symbols + len_mid_symbols + len_high_symbols,
+
+ min_match_len = 2, // must be 2
+ max_match_len = min_match_len + max_len_symbols - 1, // 273
+ min_match_len_limit = 5,
+
+ 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;
+ }
+
+
+enum { bit_model_move_bits = 5,
+ bit_model_total_bits = 11,
+ bit_model_total = 1 << bit_model_total_bits };
+
+struct Bit_model
+ {
+ unsigned int probability;
+ Bit_model() throw() : probability( bit_model_total / 2 ) {}
+ };
+
+
+class Pretty_print
+ {
+ const char * const stdin_name;
+ unsigned int longest_name;
+ const int verbosity_;
+ std::string name_;
+ mutable bool first_post;
+
+public:
+ Pretty_print( const std::vector< std::string > & filenames, const int v )
+ : stdin_name( "(stdin)" ), longest_name( 0 ), verbosity_( v ),
+ first_post( false )
+ {
+ const unsigned int stdin_name_len = std::strlen( stdin_name );
+ 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(); }
+ int verbosity() const throw() { return verbosity_; }
+ void operator()( const char * const msg = 0 ) const throw();
+ };
+
+
+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 = 0xEDB88320U ^ ( 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 ); }
+ void update( uint32_t & crc, const uint8_t * const buffer, const int size ) const throw()
+ {
+ for( int i = 0; i < size; ++i )
+ crc = data[(crc^buffer[i])&0xFF] ^ ( crc >> 8 );
+ }
+ };
+
+extern const CRC32 crc32;
+
+
+inline 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;
+ }
+
+const uint8_t magic_string[4] = { 'L', 'Z', 'I', 'P' };
+
+struct File_header
+ {
+ uint8_t data[6]; // 0-3 magic bytes
+ // 4 version
+ // 5 coded_dict_size
+ enum { size = 6 };
+
+ void set_magic() throw()
+ { std::memcpy( data, magic_string, 4 ); data[4] = 1; }
+
+ bool verify_magic() const throw()
+ { return ( std::memcmp( data, magic_string, 4 ) == 0 ); }
+
+ uint8_t version() const throw() { return data[4]; }
+ bool verify_version() const throw() { return ( data[4] <= 1 ); }
+
+ int dictionary_size() const throw()
+ {
+ int sz = ( 1 << ( data[5] & 0x1F ) );
+ if( sz > min_dictionary_size && sz <= max_dictionary_size )
+ sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 0x07 );
+ return sz;
+ }
+
+ bool dictionary_size( const int sz ) throw()
+ {
+ if( sz >= min_dictionary_size && sz <= max_dictionary_size )
+ {
+ data[5] = real_bits( sz - 1 );
+ if( sz > min_dictionary_size )
+ {
+ const int base_size = 1 << data[5];
+ const int wedge = base_size / 16;
+ for( int i = 7; i >= 1; --i )
+ if( base_size - ( i * wedge ) >= sz )
+ { data[5] |= ( i << 5 ); break; }
+ }
+ return true;
+ }
+ return false;
+ }
+ };
+
+
+struct File_trailer
+ {
+ uint8_t data[20]; // 0-3 CRC32 of the uncompressed data
+ // 4-11 size of the uncompressed data
+ // 12-19 member size including header and trailer
+
+ static int size( const int version = 1 )
+ { return ( ( version >= 1 ) ? 20 : 12 ); }
+
+ uint32_t data_crc() const throw()
+ {
+ uint32_t tmp = 0;
+ for( int i = 3; i >= 0; --i ) { tmp <<= 8; tmp += data[i]; }
+ return tmp;
+ }
+
+ void data_crc( uint32_t crc ) throw()
+ { for( int i = 0; i <= 3; ++i ) { data[i] = (uint8_t)crc; crc >>= 8; } }
+
+ long long data_size() const throw()
+ {
+ long long tmp = 0;
+ for( int i = 11; i >= 4; --i ) { tmp <<= 8; tmp += data[i]; }
+ return tmp;
+ }
+
+ void data_size( long long sz ) throw()
+ {
+ for( int i = 4; i <= 11; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; }
+ }
+
+ long long member_size() const throw()
+ {
+ long long tmp = 0;
+ for( int i = 19; i >= 12; --i ) { tmp <<= 8; tmp += data[i]; }
+ return tmp;
+ }
+
+ void member_size( long long sz ) throw()
+ {
+ for( int i = 12; i <= 19; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; }
+ }
+ };
+
+
+struct Error
+ {
+ const char * const msg;
+ Error( const char * const s ) throw() : msg( s ) {}
+ };
+
+
+#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
+
+
+// defined in decoder.cc
+int readblock( const int fd, uint8_t * const buf, const int size ) throw();
+int writeblock( const int fd, const uint8_t * const buf, const int size ) throw();
+
+// defined in main.cc
+extern int verbosity;
+int open_instream( const std::string & name, struct stat * const in_statsp,
+ const bool to_stdout, const bool reg_only = false ) throw();
+int open_outstream_rw( const std::string & output_filename,
+ const bool force ) throw();
+void show_error( const char * const msg, const int errcode = 0,
+ const bool help = false ) throw();
+void internal_error( const char * const msg );
+
+// defined in merge.cc
+void cleanup_and_fail( const std::string & output_filename,
+ const int outfd, const int retval ) throw();
+bool copy_file( const int infd, const int outfd,
+ const long long size = LLONG_MAX );
+bool try_decompress( const int fd, const long long file_size,
+ long long * failure_posp = 0 );
+bool verify_header( const File_header & header );
+bool verify_single_member( const int fd, const long long file_size );
+int merge_files( const std::vector< std::string > & filenames,
+ const std::string & output_filename, const bool force );
+
+// defined in repair.cc
+int repair_file( const std::string & input_filename,
+ const std::string & output_filename, const bool force );
+
+// defined in split.cc
+int split_file( const std::string & input_filename,
+ const std::string & default_output_filename, const bool force );
diff --git a/main.cc b/main.cc
new file mode 100644
index 0000000..2abbc0e
--- /dev/null
+++ b/main.cc
@@ -0,0 +1,676 @@
+/* Lziprecover - Data recovery tool for lzipped files
+ Copyright (C) 2009, 2010, 2011 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 lziprecover to panic.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <algorithm>
+#include <cerrno>
+#include <climits>
+#include <csignal>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <fcntl.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <utime.h>
+#include <sys/stat.h>
+#if defined(__MSVCRT__)
+#define S_IRGRP 0
+#define S_IWGRP 0
+#define S_IROTH 0
+#define S_IWOTH 0
+#endif
+
+#include "arg_parser.h"
+#include "lzip.h"
+#include "decoder.h"
+
+#if CHAR_BIT != 8
+#error "Environments where CHAR_BIT != 8 are not supported."
+#endif
+
+
+namespace {
+
+const char * const Program_name = "Lziprecover";
+const char * const program_name = "lziprecover";
+const char * const program_year = "2011";
+const char * invocation_name = 0;
+
+#ifdef O_BINARY
+const int o_binary = O_BINARY;
+#else
+const int o_binary = 0;
+#endif
+
+struct { const char * from; const char * to; } const known_extensions[] = {
+ { ".lz", "" },
+ { ".tlz", ".tar" },
+ { 0, 0 } };
+
+enum Mode { m_none, m_decompress, m_generate, m_merge, m_recover, m_repair,
+ m_split, m_test, m_update };
+
+std::string output_filename;
+int outfd = -1;
+const mode_t usr_rw = S_IRUSR | S_IWUSR;
+const mode_t all_rw = usr_rw | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
+mode_t outfd_mode = usr_rw;
+bool delete_output_on_interrupt = false;
+
+
+void show_help() throw()
+ {
+ std::printf( "%s - Data recovery tool and decompressor for lzipped files.\n", Program_name );
+ std::printf( "\nUsage: %s [options] [files]\n", invocation_name );
+ std::printf( "\nOptions:\n"
+ " -h, --help display this help and exit\n"
+ " -V, --version output version information and exit\n"
+ " -c, --stdout send decompressed output to standard output\n"
+ " -d, --decompress decompress\n"
+ " -f, --force overwrite existing output files\n"
+// " -g, --generate-recover-file generate a recover file\n"
+ " -k, --keep keep (don't delete) input files\n"
+ " -m, --merge correct errors in file using several copies\n"
+ " -o, --output=<file> place the output into <file>\n"
+ " -q, --quiet suppress all messages\n"
+// " -r, --recover correct errors in file using a recover file\n"
+ " -R, --repair try to repair a small error in file\n"
+ " -s, --split split a multimember file in single-member files\n"
+ " -t, --test test compressed file integrity\n"
+// " -u, --update convert file from version 0 to version 1\n"
+ " -v, --verbose be verbose (a 2nd -v gives more)\n"
+ "\nReport bugs to lzip-bug@nongnu.org\n"
+ "Lziprecover home page: http://www.nongnu.org/lzip/lziprecover.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"
+ "This is free software: you are free to change and redistribute it.\n"
+ "There is NO WARRANTY, to the extent permitted by law.\n" );
+ }
+
+
+const char * format_num( long long num ) throw()
+ {
+ const char * const prefix[8] =
+ { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
+ enum { buf_size = 16, factor = 1024 };
+ static char buf[buf_size];
+ const char *p = "";
+ bool exact = ( num % factor == 0 );
+
+ for( int i = 0; i < 8 && ( llabs( num ) > 9999 ||
+ ( exact && llabs( num ) >= factor ) ); ++i )
+ { num /= factor; if( num % factor != 0 ) exact = false; p = prefix[i]; }
+ snprintf( buf, buf_size, "%lld %s", num, p );
+ return buf;
+ }
+
+
+void set_mode( Mode & program_mode, const Mode new_mode ) throw()
+ {
+ if( program_mode != m_none && program_mode != new_mode )
+ {
+ show_error( "Only one operation can be specified.", 0, true );
+ std::exit( 1 );
+ }
+ program_mode = new_mode;
+ }
+
+
+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;
+ }
+
+
+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 >= 1 )
+ 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()
+ {
+ int flags = O_CREAT | O_WRONLY | o_binary;
+ if( force ) flags |= O_TRUNC; else flags |= O_EXCL;
+
+ outfd = open( output_filename.c_str(), flags, outfd_mode );
+ if( outfd < 0 && verbosity >= 0 )
+ {
+ if( errno == EEXIST )
+ 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 ( outfd >= 0 );
+ }
+
+
+bool check_tty( const int infd ) throw()
+ {
+ if( isatty( infd ) )
+ {
+ 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 )
+ {
+ delete_output_on_interrupt = false;
+ if( verbosity >= 0 )
+ std::fprintf( stderr, "%s: Deleting output file `%s', if it exists.\n",
+ program_name, output_filename.c_str() );
+ if( outfd >= 0 ) { close( outfd ); outfd = -1; }
+ if( std::remove( output_filename.c_str() ) != 0 && errno != ENOENT )
+ 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 * const in_statsp )
+ {
+ bool warning = false;
+ if( in_statsp )
+ {
+ // fchown will in many cases return with EPERM, which can be safely ignored.
+ if( ( fchown( outfd, in_statsp->st_uid, in_statsp->st_gid ) != 0 &&
+ errno != EPERM ) ||
+ fchmod( outfd, in_statsp->st_mode ) != 0 ) warning = true;
+ }
+ if( close( outfd ) != 0 ) cleanup_and_fail( 1 );
+ outfd = -1;
+ delete_output_on_interrupt = false;
+ if( in_statsp )
+ {
+ struct utimbuf t;
+ t.actime = in_statsp->st_atime;
+ t.modtime = in_statsp->st_mtime;
+ if( utime( output_filename.c_str(), &t ) != 0 ) warning = true;
+ }
+ if( warning && verbosity >= 1 )
+ show_error( "Can't change output file attributes." );
+ }
+
+
+std::string insert_fixed( std::string name ) throw()
+ {
+ if( name.size() > 4 && name.compare( name.size() - 4, 4, ".tlz" ) == 0 )
+ name.insert( name.size() - 4, "_fixed" );
+ else if( name.size() > 3 && name.compare( name.size() - 3, 3, ".lz" ) == 0 )
+ name.insert( name.size() - 3, "_fixed" );
+ else name += "_fixed.lz";
+ return name;
+ }
+
+
+unsigned char xdigit( const int value ) throw()
+ {
+ if( value >= 0 && value <= 9 ) return '0' + value;
+ if( value >= 10 && value <= 15 ) return 'A' + value - 10;
+ return 0;
+ }
+
+
+void show_trailing_garbage( const uint8_t * const data, const int size,
+ const Pretty_print & pp, const bool all ) throw()
+ {
+ std::string garbage_msg;
+ if( !all ) garbage_msg = "first bytes of ";
+ garbage_msg += "trailing garbage found = ";
+ bool text = true;
+ for( int i = 0; i < size; ++i )
+ if( !std::isprint( data[i] ) ) { text = false; break; }
+ if( text )
+ {
+ garbage_msg += '`';
+ garbage_msg.append( (const char *)data, size );
+ garbage_msg += '\'';
+ }
+ else
+ {
+ for( int i = 0; i < size; ++i )
+ {
+ if( i > 0 ) garbage_msg += ' ';
+ garbage_msg += xdigit( data[i] >> 4 );
+ garbage_msg += xdigit( data[i] & 0x0F );
+ }
+ }
+ pp( garbage_msg.c_str() );
+ }
+
+
+int decompress( const int infd, const Pretty_print & pp, const bool testing )
+ {
+ int retval = 0;
+
+ try {
+ Range_decoder rdec( infd );
+ long long partial_file_pos = 0;
+ for( bool first_member = true; ; first_member = false, pp.reset() )
+ {
+ File_header header;
+ int size;
+ rdec.reset_member_position();
+ for( size = 0; size < File_header::size && !rdec.finished(); ++size )
+ header.data[size] = rdec.get_byte();
+ if( rdec.finished() ) // End Of File
+ {
+ if( first_member )
+ { pp( "Error reading member header" ); retval = 1; }
+ else if( verbosity >= 4 && size > 0 )
+ show_trailing_garbage( header.data, size, pp, true );
+ break;
+ }
+ if( !header.verify_magic() )
+ {
+ if( first_member )
+ { pp( "Bad magic number (file not in lzip format)" ); retval = 2; }
+ else if( verbosity >= 4 )
+ show_trailing_garbage( header.data, size, pp, false );
+ break;
+ }
+ if( !header.verify_version() )
+ {
+ if( verbosity >= 0 )
+ { pp();
+ std::fprintf( stderr, "Version %d member format not supported.\n",
+ header.version() ); }
+ retval = 2; break;
+ }
+ if( header.dictionary_size() < min_dictionary_size ||
+ header.dictionary_size() > max_dictionary_size )
+ { pp( "Invalid dictionary size in member header" ); retval = 2; break; }
+
+ if( verbosity >= 2 || ( verbosity == 1 && first_member ) )
+ {
+ pp();
+ if( verbosity >= 2 )
+ std::fprintf( stderr, "version %d, dictionary size %7sB. ",
+ header.version(),
+ format_num( header.dictionary_size() ) );
+ }
+ LZ_decoder decoder( header, rdec, outfd );
+
+ const int result = decoder.decode_member( pp );
+ partial_file_pos += rdec.member_position();
+ if( result != 0 )
+ {
+ if( verbosity >= 0 && result <= 2 )
+ {
+ pp();
+ if( result == 2 )
+ std::fprintf( stderr, "File ends unexpectedly at pos %lld\n",
+ partial_file_pos );
+ else
+ std::fprintf( stderr, "Decoder error at pos %lld\n",
+ partial_file_pos );
+ }
+ retval = 2; break;
+ }
+ if( verbosity >= 2 )
+ { if( testing ) std::fprintf( stderr, "ok\n" );
+ else std::fprintf( stderr, "done\n" ); }
+ }
+ }
+ catch( std::bad_alloc )
+ {
+ pp( "Not enough memory. Find a machine with more memory" );
+ retval = 1;
+ }
+ catch( Error e ) { pp(); show_error( e.msg, errno ); retval = 1; }
+ if( verbosity == 1 && retval == 0 )
+ { if( testing ) std::fprintf( stderr, "ok\n" );
+ else std::fprintf( stderr, "done\n" ); }
+ return retval;
+ }
+
+
+extern "C" void signal_handler( int ) throw()
+ {
+ show_error( "Control-C or similar caught, quitting." );
+ cleanup_and_fail( 1 );
+ }
+
+
+void set_signals() throw()
+ {
+ std::signal( SIGHUP, signal_handler );
+ std::signal( SIGINT, signal_handler );
+ std::signal( SIGTERM, signal_handler );
+ }
+
+} // end namespace
+
+
+int verbosity = 0;
+
+
+int open_instream( const std::string & name, struct stat * const in_statsp,
+ const bool to_stdout, const bool reg_only ) throw()
+ {
+ int infd = open( name.c_str(), O_RDONLY | o_binary );
+ if( infd < 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( infd, in_statsp );
+ const mode_t & mode = in_statsp->st_mode;
+ const bool can_read = ( i == 0 && !reg_only &&
+ ( S_ISBLK( mode ) || S_ISCHR( mode ) ||
+ S_ISFIFO( mode ) || S_ISSOCK( mode ) ) );
+ if( i != 0 || ( !S_ISREG( mode ) && ( !to_stdout || !can_read ) ) )
+ {
+ if( verbosity >= 0 )
+ std::fprintf( stderr, "%s: Input file `%s' is not a regular file%s.\n",
+ program_name, name.c_str(),
+ ( can_read && !to_stdout ) ?
+ " and `--stdout' was not specified" : "" );
+ close( infd );
+ infd = -1;
+ }
+ }
+ return infd;
+ }
+
+
+int open_outstream_rw( const std::string & output_filename,
+ const bool force ) throw()
+ {
+ int flags = O_CREAT | O_RDWR | o_binary;
+ if( force ) flags |= O_TRUNC; else flags |= O_EXCL;
+
+ int outfd = open( output_filename.c_str(), flags, all_rw );
+ if( outfd < 0 && verbosity >= 0 )
+ {
+ if( errno == EEXIST )
+ std::fprintf( stderr, "%s: Output file `%s' already exists."
+ " Use `--force' to overwrite it.\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 outfd;
+ }
+
+
+void show_error( const char * const msg, const int errcode, const bool help ) throw()
+ {
+ if( verbosity >= 0 )
+ {
+ if( msg && msg[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] )
+ std::fprintf( stderr, "Try `%s --help' for more information.\n",
+ invocation_name );
+ }
+ }
+
+
+void internal_error( const char * const msg )
+ {
+ if( verbosity >= 0 )
+ std::fprintf( stderr, "%s: internal error: %s.\n", program_name, msg );
+ std::exit( 3 );
+ }
+
+
+int main( const int argc, const char * const argv[] )
+ {
+ int infd = -1;
+ Mode program_mode = m_none;
+ 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];
+
+ const Arg_parser::Option options[] =
+ {
+ { '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', "merge", Arg_parser::no },
+ { 'o', "output", Arg_parser::yes },
+ { 'q', "quiet", Arg_parser::no },
+ { 'R', "repair", Arg_parser::no },
+ { 's', "split", Arg_parser::no },
+ { 't', "test", Arg_parser::no },
+ { 'v', "verbose", Arg_parser::no },
+ { 'V', "version", Arg_parser::no },
+ { 0 , 0, Arg_parser::no } };
+
+ const 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
+ switch( code )
+ {
+ case 'c': to_stdout = true; break;
+ case 'd': set_mode( 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': set_mode( program_mode, m_merge ); break;
+ case 'o': default_output_filename = parser.argument( argind ); break;
+ case 'q': verbosity = -1; break;
+ case 'R': set_mode( program_mode, m_repair ); break;
+ case 's': set_mode( program_mode, m_split ); break;
+ case 't': set_mode( program_mode, m_test ); break;
+ case 'v': if( verbosity < 4 ) ++verbosity; break;
+ case 'V': show_version(); return 0;
+ default : internal_error( "uncaught option" );
+ }
+ } // end process options
+
+ if( program_mode == m_none )
+ {
+ show_error( "You must specify the operation to be performed.", 0, true );
+ return 1;
+ }
+
+ switch( program_mode )
+ {
+ case m_generate:
+ case m_recover:
+ case m_update:
+ case m_none: internal_error( "invalid operation" ); break;
+ case m_decompress: break;
+ case m_merge:
+ {
+ std::vector< std::string > filenames;
+ for( ; argind < parser.arguments(); ++argind )
+ filenames.push_back( parser.argument( argind ) );
+ if( filenames.size() < 2 )
+ { show_error( "You must specify at least 2 files.", 0, true ); return 1; }
+ if( !default_output_filename.size() )
+ default_output_filename = insert_fixed( filenames[0] );
+ return merge_files( filenames, default_output_filename, force );
+ } break;
+ case m_repair:
+ {
+ if( argind + 1 != parser.arguments() )
+ { show_error( "You must specify exactly 1 file.", 0, true ); return 1; }
+ if( !default_output_filename.size() )
+ default_output_filename = insert_fixed( parser.argument( argind ) );
+ return repair_file( parser.argument( argind ), default_output_filename, force );
+ } break;
+ case m_split:
+ {
+ if( argind + 1 != parser.arguments() )
+ { show_error( "You must specify exactly 1 file.", 0, true ); return 1; }
+ return split_file( parser.argument( argind ), default_output_filename, force );
+ } break;
+ case m_test: break;
+ }
+
+ 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( !to_stdout && program_mode != m_test &&
+ ( filenames_given || default_output_filename.size() ) )
+ set_signals();
+
+ Pretty_print pp( filenames, verbosity );
+ if( program_mode == m_test )
+ outfd = -1;
+ else if( program_mode != m_decompress )
+ internal_error( "invalid decompressor operation" );
+
+ 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();
+ infd = STDIN_FILENO;
+ if( program_mode != m_test )
+ {
+ if( to_stdout || !default_output_filename.size() )
+ outfd = STDOUT_FILENO;
+ else
+ {
+ output_filename = default_output_filename;
+ outfd_mode = all_rw;
+ if( !open_outstream( force ) )
+ {
+ if( outfd == -1 && retval < 1 ) retval = 1;
+ close( infd ); infd = -1;
+ continue;
+ }
+ }
+ }
+ }
+ else
+ {
+ input_filename = filenames[i];
+ const int eindex = extension_index( input_filename );
+ infd = open_instream( input_filename, &in_stats, to_stdout );
+ if( infd < 0 ) { if( retval < 1 ) retval = 1; continue; }
+ if( program_mode != m_test )
+ {
+ if( to_stdout ) outfd = STDOUT_FILENO;
+ else
+ {
+ set_d_outname( input_filename, eindex );
+ outfd_mode = usr_rw;
+ if( !open_outstream( force ) )
+ {
+ if( outfd == -1 && retval < 1 ) retval = 1;
+ close( infd ); infd = -1;
+ continue;
+ }
+ }
+ }
+ }
+
+ if( !check_tty( infd ) ) return 1;
+
+ if( output_filename.size() && !to_stdout && program_mode != m_test )
+ delete_output_on_interrupt = true;
+ const struct stat * const in_statsp = input_filename.size() ? &in_stats : 0;
+ pp.set_name( input_filename );
+ const int tmp = decompress( infd, 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 );
+ if( input_filename.size() )
+ {
+ close( infd ); infd = -1;
+ if( !keep_input_files && !to_stdout && program_mode != m_test )
+ std::remove( input_filename.c_str() );
+ }
+ }
+ if( outfd >= 0 && close( outfd ) != 0 )
+ {
+ show_error( "Can't close stdout", errno );
+ if( retval < 1 ) retval = 1;
+ }
+ return retval;
+ }
diff --git a/merge.cc b/merge.cc
new file mode 100644
index 0000000..298d90b
--- /dev/null
+++ b/merge.cc
@@ -0,0 +1,406 @@
+/* Lziprecover - Data recovery tool for lzipped files
+ Copyright (C) 2009, 2010, 2011 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/>.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <cerrno>
+#include <climits>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <stdint.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "lzip.h"
+#include "decoder.h"
+
+
+namespace {
+
+class Block
+ {
+ long long pos_, size_; // pos + size <= LLONG_MAX
+
+public:
+ Block( const long long p, const long long s ) throw()
+ : pos_( p ), size_( s ) {}
+
+ long long pos() const throw() { return pos_; }
+ long long size() const throw() { return size_; }
+ long long end() const throw() { return pos_ + size_; }
+
+ void pos( const long long p ) throw() { pos_ = p; }
+ void size( const long long s ) throw() { size_ = s; }
+ void shift( Block & b ) throw() { ++size_; ++b.pos_; --b.size_; }
+ };
+
+
+bool copy_and_diff_file( const std::vector< int > & infd_vector,
+ const int outfd, std::vector< Block > & block_vector )
+ {
+ const int buffer_size = 65536;
+ std::vector< uint8_t * > buffer_vector( infd_vector.size() );
+ for( unsigned int i = 0; i < infd_vector.size(); ++i )
+ buffer_vector[i] = new uint8_t[buffer_size];
+ Block b( 0, 0 );
+ long long partial_pos = 0;
+ int equal_bytes = 0;
+ bool error = false;
+
+ while( true )
+ {
+ const int rd = readblock( infd_vector[0], buffer_vector[0], buffer_size );
+ if( rd != buffer_size && errno )
+ { show_error( "Error reading input file", errno ); error = true; break; }
+ if( rd > 0 )
+ {
+ for( unsigned int i = 1; i < infd_vector.size(); ++i )
+ if( readblock( infd_vector[i], buffer_vector[i], rd ) != rd )
+ { show_error( "Error reading input file", errno );
+ error = true; break; }
+ if( error ) break;
+ const int wr = writeblock( outfd, buffer_vector[0], rd );
+ if( wr != rd )
+ { show_error( "Error writing output file", errno );
+ error = true; break; }
+ for( int i = 0; i < rd; ++i )
+ {
+ while( i < rd && b.pos() == 0 )
+ {
+ for( unsigned int j = 1; j < infd_vector.size(); ++j )
+ if( buffer_vector[0][i] != buffer_vector[j][i] )
+ { b.pos( partial_pos + i ); break; } // begin block
+ ++i;
+ }
+ while( i < rd && b.pos() > 0 )
+ {
+ ++equal_bytes;
+ for( unsigned int j = 1; j < infd_vector.size(); ++j )
+ if( buffer_vector[0][i] != buffer_vector[j][i] )
+ { equal_bytes = 0; break; }
+ if( equal_bytes >= 2 ) // end block
+ {
+ b.size( partial_pos + i - ( equal_bytes - 1 ) - b.pos() );
+ block_vector.push_back( b );
+ b.pos( 0 );
+ equal_bytes = 0;
+ }
+ ++i;
+ }
+ }
+ partial_pos += rd;
+ }
+ if( rd < buffer_size ) break; // EOF
+ }
+ if( b.pos() > 0 ) // finish last block
+ {
+ b.size( partial_pos - b.pos() );
+ block_vector.push_back( b );
+ }
+ for( unsigned int i = 0; i < infd_vector.size(); ++i )
+ delete[] buffer_vector[i];
+ return !error;
+ }
+
+
+int ipow( const unsigned int base, const unsigned int exponent ) throw()
+ {
+ int result = 1;
+ for( unsigned int i = 0; i < exponent; ++i )
+ {
+ if( INT_MAX / base >= (unsigned int)result ) result *= base;
+ else { result = INT_MAX; break; }
+ }
+ return result;
+ }
+
+
+int open_input_files( const std::vector< std::string > & filenames,
+ std::vector< int > & infd_vector, long long & isize )
+ {
+ bool identical = false;
+ for( unsigned int i = 1; i < filenames.size(); ++i )
+ if( filenames[0] == filenames[i] )
+ { identical = true; break; }
+ if( !identical )
+ for( unsigned int i = 0; i < filenames.size(); ++i )
+ {
+ struct stat in_stats;
+ ino_t st_ino0 = 0;
+ dev_t st_dev0 = 0;
+ infd_vector[i] = open_instream( filenames[i], &in_stats, true, true );
+ if( infd_vector[i] < 0 ) return 1;
+ if( i == 0 ) { st_ino0 = in_stats.st_ino; st_dev0 = in_stats.st_dev; }
+ else if( st_ino0 == in_stats.st_ino && st_dev0 == in_stats.st_dev )
+ { identical = true; break; }
+ }
+ if( identical ) { show_error( "Two input files are the same." ); return 1; }
+
+ isize = 0;
+ for( unsigned int i = 0; i < filenames.size(); ++i )
+ {
+ const long long tmp = lseek( infd_vector[i], 0, SEEK_END );
+ if( tmp < 0 )
+ {
+ if( verbosity >= 0 )
+ std::fprintf( stderr, "File `%s' is not seekable.\n", filenames[i].c_str() );
+ return 1;
+ }
+ if( i == 0 )
+ {
+ isize = tmp;
+ if( isize < 36 ) { show_error( "Input file is too short." ); return 2; }
+ }
+ else if( isize != tmp )
+ { show_error( "Sizes of input files are different." ); return 1; }
+ }
+
+ for( unsigned int i = 0; i < filenames.size(); ++i )
+ if( !verify_single_member( infd_vector[i], isize ) )
+ return 2;
+
+ for( unsigned int i = 0; i < filenames.size(); ++i )
+ {
+ if( lseek( infd_vector[i], 0, SEEK_SET ) < 0 )
+ { show_error( "Seek error in input file", errno ); return 1; }
+ if( try_decompress( infd_vector[i], isize ) )
+ {
+ if( verbosity >= 1 )
+ std::printf( "File `%s' has no errors. Recovery is not needed.\n",
+ filenames[i].c_str() );
+ return 0;
+ }
+ if( lseek( infd_vector[i], 0, SEEK_SET ) < 0 )
+ { show_error( "Seek error in input file", errno ); return 1; }
+ }
+ return -1;
+ }
+
+} // end namespace
+
+
+void cleanup_and_fail( const std::string & output_filename,
+ const int outfd, const int retval ) throw()
+ {
+ if( outfd >= 0 ) close( outfd );
+ if( std::remove( output_filename.c_str() ) != 0 && errno != ENOENT )
+ show_error( "WARNING: deletion of output file (apparently) failed." );
+ std::exit( retval );
+ }
+
+
+bool copy_file( const int infd, const int outfd, const long long size )
+ {
+ long long rest = size;
+ const int buffer_size = 65536;
+ uint8_t * const buffer = new uint8_t[buffer_size];
+ bool error = false;
+
+ while( true )
+ {
+ const int block_size = std::min( (long long)buffer_size, rest );
+ if( block_size <= 0 ) break;
+ const int rd = readblock( infd, buffer, block_size );
+ if( rd != block_size && errno )
+ { show_error( "Error reading input file", errno ); error = true; break; }
+ if( rd > 0 )
+ {
+ const int wr = writeblock( outfd, buffer, rd );
+ if( wr != rd )
+ { show_error( "Error writing output file", errno );
+ error = true; break; }
+ rest -= rd;
+ }
+ if( rd < block_size ) break; // EOF
+ }
+ delete[] buffer;
+ return !error;
+ }
+
+
+bool try_decompress( const int fd, const long long file_size,
+ long long * failure_posp )
+ {
+ try {
+ Range_decoder rdec( fd );
+ File_header header;
+ rdec.reset_member_position();
+ for( int i = 0; i < File_header::size; ++i )
+ header.data[i] = rdec.get_byte();
+ if( !rdec.finished() && // End Of File
+ header.verify_magic() &&
+ header.version() == 1 &&
+ header.dictionary_size() >= min_dictionary_size &&
+ header.dictionary_size() <= max_dictionary_size )
+ {
+ LZ_decoder decoder( header, rdec, -1 );
+ std::vector< std::string > dummy_filenames;
+ Pretty_print dummy( dummy_filenames, -1 );
+
+ if( decoder.decode_member( dummy ) == 0 &&
+ rdec.member_position() == file_size ) return true;
+ if( failure_posp ) *failure_posp = rdec.member_position();
+ }
+ }
+ catch( std::bad_alloc )
+ {
+ show_error( "Not enough memory. Find a machine with more memory." );
+ std::exit( 1 );
+ }
+ catch( Error e ) {}
+ return false;
+ }
+
+
+bool verify_header( const File_header & header )
+ {
+ if( !header.verify_magic() )
+ {
+ show_error( "Bad magic number (file not in lzip format)." );
+ return false;
+ }
+ if( header.version() == 0 )
+ {
+ show_error( "Version 0 member format can't be recovered." );
+ return false;
+ }
+ if( header.version() != 1 )
+ {
+ if( verbosity >= 0 )
+ std::fprintf( stderr, "Version %d member format not supported.\n",
+ header.version() );
+ return false;
+ }
+ return true;
+ }
+
+
+bool verify_single_member( const int fd, const long long file_size )
+ {
+ File_header header;
+ if( lseek( fd, 0, SEEK_SET ) < 0 ||
+ readblock( fd, header.data, File_header::size ) != File_header::size )
+ { show_error( "Error reading member header", errno ); return false; }
+ if( !verify_header( header ) ) return false;
+
+ File_trailer trailer;
+ if( lseek( fd, -File_trailer::size(), SEEK_END ) < 0 ||
+ readblock( fd, trailer.data, File_trailer::size() ) != File_trailer::size() )
+ { show_error( "Error reading member trailer", errno ); return false; }
+ const long long member_size = trailer.member_size();
+ if( member_size != file_size )
+ {
+ if( member_size < file_size &&
+ lseek( fd, -member_size, SEEK_END ) > 0 &&
+ readblock( fd, header.data, File_header::size ) == File_header::size &&
+ verify_header( header ) )
+ show_error( "Input file has more than 1 member. Split it first." );
+ else
+ show_error( "Member size in input file trailer is corrupt." );
+ return false;
+ }
+ return true;
+ }
+
+
+int merge_files( const std::vector< std::string > & filenames,
+ const std::string & output_filename, const bool force )
+ {
+ std::vector< int > infd_vector( filenames.size() );
+ long long isize = 0;
+ const int retval = open_input_files( filenames, infd_vector, isize );
+ if( retval >= 0 ) return retval;
+
+ const int outfd = open_outstream_rw( output_filename, force );
+ if( outfd < 0 ) return 1;
+
+ // vector of data blocks differing among the copies of the input file.
+ std::vector< Block > block_vector;
+ if( !copy_and_diff_file( infd_vector, outfd, block_vector ) )
+ cleanup_and_fail( output_filename, outfd, 1 );
+
+ if( !block_vector.size() )
+ { show_error( "Input files are identical. Recovery is not possible." );
+ cleanup_and_fail( output_filename, outfd, 2 ); }
+
+ const bool single_block = ( block_vector.size() == 1 );
+ if( single_block && block_vector[0].size() < 2 )
+ { show_error( "Input files have the same byte damaged."
+ " Try repairing one of them." );
+ cleanup_and_fail( output_filename, outfd, 2 ); }
+
+ if( ipow( filenames.size(), block_vector.size() ) >= INT_MAX ||
+ ( single_block &&
+ ipow( filenames.size(), 2 ) >= INT_MAX / block_vector[0].size() ) )
+ { show_error( "Input files are too damaged. Recovery is not possible." );
+ cleanup_and_fail( output_filename, outfd, 2 ); }
+
+ const int shifts = ( single_block ? block_vector[0].size() - 1 : 1 );
+ if( single_block )
+ {
+ Block b( block_vector[0].pos() + 1, block_vector[0].size() - 1 );
+ block_vector[0].size( 1 );
+ block_vector.push_back( b );
+ }
+
+ const int base_variations = ipow( filenames.size(), block_vector.size() );
+ const int variations = ( base_variations * shifts ) - 2;
+ bool done = false;
+ for( int var = 1; var <= variations; ++var )
+ {
+ if( verbosity >= 1 )
+ {
+ std::printf( "Trying variation %d of %d \r", var, variations );
+ std::fflush( stdout );
+ }
+ int tmp = var;
+ for( unsigned int i = 0; i < block_vector.size(); ++i )
+ {
+ const int infd = infd_vector[tmp % filenames.size()];
+ tmp /= filenames.size();
+ if( lseek( infd, block_vector[i].pos(), SEEK_SET ) < 0 ||
+ lseek( outfd, block_vector[i].pos(), SEEK_SET ) < 0 ||
+ !copy_file( infd, outfd, block_vector[i].size() ) )
+ { show_error( "Error reading output file", errno );
+ cleanup_and_fail( output_filename, outfd, 1 ); }
+ }
+ if( lseek( outfd, 0, SEEK_SET ) < 0 )
+ { show_error( "Seek error in output file", errno );
+ cleanup_and_fail( output_filename, outfd, 1 ); }
+ if( try_decompress( outfd, isize ) )
+ { done = true; break; }
+ if( var % base_variations == 0 ) block_vector[0].shift( block_vector[1] );
+ }
+ if( verbosity >= 1 ) std::printf( "\n" );
+
+ if( close( outfd ) != 0 )
+ {
+ show_error( "Error closing output file", errno );
+ cleanup_and_fail( output_filename, -1, 1 );
+ }
+ if( !done )
+ {
+ show_error( "Some error areas overlap. Can't recover input file." );
+ cleanup_and_fail( output_filename, -1, 2 );
+ }
+ if( verbosity >= 1 )
+ std::printf( "Input files merged successfully.\n" );
+ return 0;
+ }
diff --git a/repair.cc b/repair.cc
new file mode 100644
index 0000000..8a92e59
--- /dev/null
+++ b/repair.cc
@@ -0,0 +1,114 @@
+/* Lziprecover - Data recovery tool for lzipped files
+ Copyright (C) 2009, 2010, 2011 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/>.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <cerrno>
+#include <climits>
+#include <cstdio>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <stdint.h>
+#include <sys/stat.h>
+
+#include "lzip.h"
+
+
+int repair_file( const std::string & input_filename,
+ const std::string & output_filename, const bool force )
+ {
+ struct stat in_stats;
+ const int infd = open_instream( input_filename, &in_stats, true, true );
+ if( infd < 0 ) return 1;
+ const long long isize = lseek( infd, 0, SEEK_END );
+ if( isize < 0 )
+ { show_error( "Input file is not seekable", errno ); return 1; }
+ if( isize < 36 )
+ { show_error( "Input file is too short." ); return 2; }
+ if( !verify_single_member( infd, isize ) ) return 2;
+ if( lseek( infd, 0, SEEK_SET ) < 0 )
+ { show_error( "Seek error in input file", errno ); return 1; }
+
+ long long failure_pos = 0;
+ if( try_decompress( infd, isize, &failure_pos ) )
+ {
+ if( verbosity >= 1 )
+ std::printf( "Input file has no errors. Recovery is not needed.\n" );
+ return 0;
+ }
+ if( failure_pos >= isize - 8 ) failure_pos = isize - 8 - 1;
+ if( failure_pos < File_header::size )
+ { show_error( "Can't repair error in input file." ); return 2; }
+
+ if( lseek( infd, 0, SEEK_SET ) < 0 )
+ { show_error( "Seek error in input file", errno ); return 1; }
+
+ const int outfd = open_outstream_rw( output_filename, force );
+ if( outfd < 0 ) { close( infd ); return 1; }
+ if( !copy_file( infd, outfd ) )
+ cleanup_and_fail( output_filename, outfd, 1 );
+
+ const long long min_pos =
+ std::max( (long long)File_header::size, failure_pos - 1000 );
+ bool done = false;
+ for( long long pos = failure_pos; pos >= min_pos; --pos )
+ {
+ if( verbosity >= 1 )
+ {
+ std::printf( "Trying position %lld \r", pos );
+ std::fflush( stdout );
+ }
+ uint8_t byte;
+ if( lseek( outfd, pos, SEEK_SET ) < 0 ||
+ readblock( outfd, &byte, 1 ) != 1 )
+ { show_error( "Error reading output file", errno );
+ cleanup_and_fail( output_filename, outfd, 1 ); }
+ for( int i = 0; i < 255; ++i )
+ {
+ ++byte;
+ if( lseek( outfd, pos, SEEK_SET ) < 0 ||
+ writeblock( outfd, &byte, 1 ) != 1 ||
+ lseek( outfd, 0, SEEK_SET ) < 0 )
+ { show_error( "Error writing output file", errno );
+ cleanup_and_fail( output_filename, outfd, 1 ); }
+ if( try_decompress( outfd, isize ) )
+ { done = true; break; }
+ }
+ if( done ) break;
+ ++byte;
+ if( lseek( outfd, pos, SEEK_SET ) < 0 ||
+ writeblock( outfd, &byte, 1 ) != 1 )
+ { show_error( "Error writing output file", errno );
+ cleanup_and_fail( output_filename, outfd, 1 ); }
+ }
+ if( verbosity >= 1 ) std::printf( "\n" );
+
+ if( close( outfd ) != 0 )
+ {
+ show_error( "Error closing output file", errno );
+ cleanup_and_fail( output_filename, -1, 1 );
+ }
+ if( !done )
+ {
+ show_error( "Error is larger than 1 byte. Can't repair input file." );
+ cleanup_and_fail( output_filename, -1, 2 );
+ }
+ if( verbosity >= 1 )
+ std::printf( "Copy of input file repaired successfully.\n" );
+ return 0;
+ }
diff --git a/split.cc b/split.cc
new file mode 100644
index 0000000..d6538f8
--- /dev/null
+++ b/split.cc
@@ -0,0 +1,176 @@
+/* Lziprecover - Data recovery tool for lzipped files
+ Copyright (C) 2009, 2010, 2011 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/>.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <cerrno>
+#include <climits>
+#include <cstdio>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <stdint.h>
+#include <sys/stat.h>
+
+#include "lzip.h"
+
+
+namespace {
+
+void first_filename( const std::string & input_filename,
+ const std::string & default_output_filename,
+ std::string & output_filename )
+ {
+ if( default_output_filename.size() )
+ output_filename = default_output_filename;
+ else
+ output_filename = input_filename;
+ int b = output_filename.size();
+ while( b > 0 && output_filename[b-1] != '/' ) --b;
+ output_filename.insert( b, "rec00001" );
+ }
+
+
+bool next_filename( std::string & output_filename )
+ {
+ int b = output_filename.size();
+ while( b > 0 && output_filename[b-1] != '/' ) --b;
+ for( int i = b + 7; i >= b + 3; --i ) // "rec00001"
+ {
+ if( output_filename[i] < '9' ) { ++output_filename[i]; return true; }
+ else output_filename[i] = '0';
+ }
+ return false;
+ }
+
+
+// Search forward from 'pos' for "LZIP" (Boyer-Moore algorithm)
+// Return pos of found string or 'pos+size' if not found.
+//
+int find_magic( const uint8_t * const buffer, const int pos, const int size ) throw()
+ {
+ const unsigned char table[256] = {
+ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+ 4,4,4,4,4,4,4,4,4,1,4,4,3,4,4,4,4,4,4,4,4,4,4,4,4,4,2,4,4,4,4,4,
+ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4 };
+
+ for( int i = pos; i <= pos + size - 4; i += table[buffer[i+3]] )
+ if( buffer[i] == 'L' && buffer[i+1] == 'Z' &&
+ buffer[i+2] == 'I' && buffer[i+3] == 'P' )
+ return i; // magic string found
+ return pos + size;
+ }
+
+
+int do_split_file( const std::string & input_filename, uint8_t * & base_buffer,
+ const std::string & default_output_filename, const bool force )
+ {
+ const int hsize = File_header::size;
+ const int tsize = File_trailer::size();
+ const int buffer_size = 65536;
+ const int base_buffer_size = tsize + buffer_size + hsize;
+ base_buffer = new uint8_t[base_buffer_size];
+ uint8_t * const buffer = base_buffer + tsize;
+
+ struct stat in_stats;
+ const int infd = open_instream( input_filename, &in_stats, true, true );
+ if( infd < 0 ) return 1;
+ int size = readblock( infd, buffer, buffer_size + hsize ) - hsize;
+ bool at_stream_end = ( size < buffer_size );
+ if( size != buffer_size && errno )
+ { show_error( "Read error", errno ); return 1; }
+ if( size <= tsize )
+ { show_error( "Input file is too short." ); return 2; }
+ if( !verify_header( *(File_header *)buffer ) ) return 2;
+
+ std::string output_filename;
+ first_filename( input_filename, default_output_filename, output_filename );
+ int outfd = open_outstream_rw( output_filename, force );
+ if( outfd < 0 ) { close( infd ); return 1; }
+
+ long long partial_member_size = 0;
+ while( true )
+ {
+ int pos = 0;
+ for( int newpos = 1; newpos <= size; ++newpos )
+ {
+ newpos = find_magic( buffer, newpos, size + 4 - newpos );
+ if( newpos <= size )
+ {
+ long long member_size = 0;
+ for( int i = 1; i <= 8; ++i )
+ { member_size <<= 8; member_size += base_buffer[tsize+newpos-i]; }
+ if( partial_member_size + newpos - pos == member_size )
+ { // header found
+ const int wr = writeblock( outfd, buffer + pos, newpos - pos );
+ if( wr != newpos - pos )
+ { show_error( "Write error", errno ); return 1; }
+ if( close( outfd ) != 0 )
+ { show_error( "Error closing output file", errno ); return 1; }
+ if( !next_filename( output_filename ) )
+ { show_error( "Too many members in file." ); close( infd ); return 1; }
+ outfd = open_outstream_rw( output_filename, force );
+ if( outfd < 0 ) { close( infd ); return 1; }
+ partial_member_size = 0;
+ pos = newpos;
+ }
+ }
+ }
+
+ if( at_stream_end )
+ {
+ const int wr = writeblock( outfd, buffer + pos, size + hsize - pos );
+ if( wr != size + hsize - pos )
+ { show_error( "Write error", errno ); return 1; }
+ break;
+ }
+ if( pos < buffer_size )
+ {
+ partial_member_size += buffer_size - pos;
+ const int wr = writeblock( outfd, buffer + pos, buffer_size - pos );
+ if( wr != buffer_size - pos )
+ { show_error( "Write error", errno ); return 1; }
+ }
+ std::memcpy( base_buffer, base_buffer + buffer_size, tsize + hsize );
+ size = readblock( infd, buffer + hsize, buffer_size );
+ at_stream_end = ( size < buffer_size );
+ if( size != buffer_size && errno )
+ { show_error( "Read error", errno ); return 1; }
+ }
+ close( infd );
+ if( close( outfd ) != 0 )
+ { show_error( "Error closing output file", errno ); return 1; }
+ return 0;
+ }
+
+} // end namespace
+
+
+int split_file( const std::string & input_filename,
+ const std::string & default_output_filename, const bool force )
+ {
+ uint8_t * base_buffer;
+ const int retval = do_split_file( input_filename, base_buffer,
+ default_output_filename, force );
+ delete[] base_buffer;
+ return retval;
+ }
diff --git a/testsuite/check.sh b/testsuite/check.sh
new file mode 100755
index 0000000..5885ba2
--- /dev/null
+++ b/testsuite/check.sh
@@ -0,0 +1,103 @@
+#! /bin/sh
+# check script for Lziprecover - Data recovery tool for lzipped files
+# Copyright (C) 2009, 2010, 2011 Antonio Diaz Diaz.
+#
+# This script is free software: you have unlimited permission
+# to copy, distribute and modify it.
+
+LC_ALL=C
+export LC_ALL
+objdir=`pwd`
+testdir=`cd "$1" ; pwd`
+LZIPRECOVER="${objdir}"/lziprecover
+framework_failure() { echo "failure in testing framework" ; exit 1 ; }
+
+if [ ! -x "${LZIPRECOVER}" ] ; then
+ echo "${LZIPRECOVER}: cannot execute"
+ exit 1
+fi
+
+if [ -d tmp ] ; then rm -rf tmp ; fi
+mkdir tmp
+cd "${objdir}"/tmp
+
+ln "${testdir}"/test.txt in || framework_failure
+ln "${testdir}"/test_v1.lz in.lz || framework_failure
+cat in.lz in.lz in.lz > in3.lz || framework_failure
+for i in 1 2 3 4 5 ; do
+ ln "${testdir}"/test_bad${i}.lz bad${i}.lz
+done
+fail=0
+
+# Description of test files for lziprecover:
+# test_bad1.lz: byte at offset 67 changed from 0xCC to 0x33
+# test_bad2.lz: [ 34- 66) --> copy of bytes [ 68- 100)
+# test_bad3.lz: [ 512-1536) --> zeroed; [2560-3584) --> zeroed
+# test_bad4.lz: [3072-4096) --> random data; [4608-5632) --> zeroed
+# test_bad5.lz: [1024-2048) --> random data; [5120-6144) --> random data
+
+printf "testing lziprecover-%s..." "$2"
+
+"${LZIPRECOVER}" -m -o copy.lz bad1.lz bad2.lz bad1.lz -q
+if [ $? != 1 ] ; then fail=1 ; printf - ; else printf . ; fi
+"${LZIPRECOVER}" -m -o copy.lz bad1.lz bad2.lz || fail=1
+"${LZIPRECOVER}" -df copy.lz || fail=1
+cmp in copy || fail=1
+printf .
+"${LZIPRECOVER}" -m -o copy.lz bad2.lz bad1.lz || fail=1
+"${LZIPRECOVER}" -df copy.lz || fail=1
+cmp in copy || fail=1
+printf .
+
+for i in 1 2 ; do
+ for j in 3 4 5 ; do
+ "${LZIPRECOVER}" -m -o copy.lz bad${i}.lz bad${j}.lz || fail=1
+ "${LZIPRECOVER}" -df copy.lz || fail=1
+ cmp in copy || fail=1
+ printf .
+ "${LZIPRECOVER}" -m -o copy.lz bad${j}.lz bad${i}.lz || fail=1
+ "${LZIPRECOVER}" -df copy.lz || fail=1
+ cmp in copy || fail=1
+ printf .
+ done
+done
+
+"${LZIPRECOVER}" -m -o copy.lz bad3.lz bad4.lz bad5.lz || fail=1
+"${LZIPRECOVER}" -df copy.lz || fail=1
+cmp in copy || fail=1
+printf .
+"${LZIPRECOVER}" -m -o copy.lz bad4.lz bad5.lz bad3.lz || fail=1
+"${LZIPRECOVER}" -df copy.lz || fail=1
+cmp in copy || fail=1
+printf .
+"${LZIPRECOVER}" -m -o copy.lz bad5.lz bad3.lz bad4.lz || fail=1
+"${LZIPRECOVER}" -df copy.lz || fail=1
+cmp in copy || fail=1
+printf .
+
+"${LZIPRECOVER}" -R in.lz || fail=1
+printf .
+"${LZIPRECOVER}" -R -o copy.lz bad2.lz -q
+if [ $? != 2 ] ; then fail=1 ; printf - ; else printf . ; fi
+"${LZIPRECOVER}" -R -o copy.lz bad1.lz || fail=1
+"${LZIPRECOVER}" -df copy.lz || fail=1
+cmp in copy || fail=1
+printf .
+
+cat in3.lz > out || framework_failure
+printf "garbage" >> out || fail=1
+"${LZIPRECOVER}" -s out -o out.lz || fail=1
+for i in 1 2 3 ; do
+ "${LZIPRECOVER}" -cd rec0000${i}out.lz > copy || fail=1
+ cmp in copy || fail=1
+ printf .
+done
+
+echo
+if [ ${fail} = 0 ] ; then
+ echo "tests completed successfully."
+ cd "${objdir}" && rm -r tmp
+else
+ echo "tests failed."
+fi
+exit ${fail}
diff --git a/testsuite/test.txt b/testsuite/test.txt
new file mode 100644
index 0000000..5b244d5
--- /dev/null
+++ b/testsuite/test.txt
@@ -0,0 +1,676 @@
+
+ GNU GENERAL PUBLIC LICENSE
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+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+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>.
+
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