Adding upstream version 1.24.upstream/1.24upstream

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

1 files changed, 1126 insertions, 0 deletions

diff --git a/main.cc b/main.cc
new file mode 100644
index 0000000..f82118f
--- /dev/null
+++ b/main.cc
@@ -0,0 +1,1126 @@
+/* Lziprecover - Data recovery tool for the lzip format
+   Copyright (C) 2009-2024 Antonio Diaz Diaz.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*
+   Exit status: 0 for a normal exit, 1 for environmental problems
+   (file not found, invalid command-line options, I/O errors, etc), 2 to
+   indicate a corrupt or invalid input file, 3 for an internal consistency
+   error (e.g., bug) which caused lziprecover to panic.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <algorithm>
+#include <cctype>
+#include <cerrno>
+#include <climits>		// SSIZE_MAX
+#include <csignal>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <new>
+#include <string>
+#include <vector>
+#include <fcntl.h>
+#include <stdint.h>		// SIZE_MAX
+#include <unistd.h>
+#include <utime.h>
+#include <sys/stat.h>
+#if defined __MSVCRT__ || defined __OS2__ || defined __DJGPP__
+#include <io.h>
+#if defined __MSVCRT__
+#define fchmod(x,y) 0
+#define fchown(x,y,z) 0
+#define SIGHUP SIGTERM
+#define S_ISSOCK(x) 0
+#ifndef S_IRGRP
+#define S_IRGRP 0
+#define S_IWGRP 0
+#define S_IROTH 0
+#define S_IWOTH 0
+#endif
+#endif
+#if defined __DJGPP__
+#define S_ISSOCK(x) 0
+#define S_ISVTX 0
+#endif
+#endif
+
+#include "arg_parser.h"
+#include "lzip.h"
+#include "decoder.h"
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+#if CHAR_BIT != 8
+#error "Environments where CHAR_BIT != 8 are not supported."
+#endif
+
+#if ( defined  SIZE_MAX &&  SIZE_MAX < ULONG_MAX ) || \
+    ( defined SSIZE_MAX && SSIZE_MAX <  LONG_MAX )
+#error "Environments where 'size_t' is narrower than 'long' are not supported."
+#endif
+
+bool fits_in_size_t( const unsigned long long size )	// fits also in long
+  { return ( sizeof (long) <= sizeof (size_t) && size <= LONG_MAX ) ||
+           ( sizeof (int) <= sizeof (size_t) && size <= INT_MAX ); }
+
+int verbosity = 0;
+
+const char * const program_name = "lziprecover";
+std::string output_filename;	// global vars for output file
+int outfd = -1;			// see 'delete_output_on_interrupt' below
+
+namespace {
+
+const char * invocation_name = program_name;		// default value
+
+const struct { const char * from; const char * to; } known_extensions[] = {
+  { ".lz",  ""     },
+  { ".tlz", ".tar" },
+  { 0,      0      } };
+
+enum Mode { m_none, m_alone_to_lz, m_byte_repair, m_clear_marking,
+            m_debug_byte_repair, m_debug_decompress, m_debug_delay,
+            m_decompress, m_dump, m_list, m_md5sum, m_merge, m_nrep_stats,
+            m_range_dec, m_remove, m_reproduce, m_show_packets, m_split,
+            m_strip, m_test, m_unzcrash_bit, m_unzcrash_block };
+
+/* Variable used in signal handler context.
+   It is not declared volatile because the handler never returns. */
+bool delete_output_on_interrupt = false;
+
+
+void show_help()
+  {
+  std::printf( "Lziprecover is a data recovery tool and decompressor for files in the lzip\n"
+               "compressed data format (.lz). Lziprecover is able to repair slightly damaged\n"
+               "files (up to one single-byte error per member), produce a correct file by\n"
+               "merging the good parts of two or more damaged copies, reproduce a missing\n"
+               "(zeroed) sector using a reference file, extract data from damaged files,\n"
+               "decompress files, and test integrity of files.\n"
+               "\nWith the help of lziprecover, losing an entire archive just because of a\n"
+               "corrupt byte near the beginning is a thing of the past.\n"
+               "\nLziprecover can remove the damaged members from multimember files, for\n"
+               "example multimember tar.lz archives.\n"
+               "\nLziprecover provides random access to the data in multimember files; it only\n"
+               "decompresses the members containing the desired data.\n"
+               "\nLziprecover facilitates the management of metadata stored as trailing data\n"
+               "in lzip files.\n"
+               "\nLziprecover is not a replacement for regular backups, but a last line of\n"
+               "defense for the case where the backups are also damaged.\n"
+               "\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"
+               "  -a, --trailing-error          exit with error status if trailing data\n"
+               "  -A, --alone-to-lz             convert lzma-alone files to lzip format\n"
+               "  -c, --stdout                  write to standard output, keep input files\n"
+               "  -d, --decompress              decompress, test compressed file integrity\n"
+               "  -D, --range-decompress=<n-m>  decompress a range of bytes to stdout\n"
+               "  -e, --reproduce               try to reproduce a zeroed sector in file\n"
+               "      --lzip-level=N|a|m[N]     reproduce one level, all, or match length\n"
+               "      --lzip-name=<name>        name of lzip executable for --reproduce\n"
+               "      --reference-file=<file>   reference file for --reproduce\n"
+               "  -f, --force                   overwrite existing output files\n"
+               "  -i, --ignore-errors           ignore some errors in -d, -D, -l, -t, --dump\n"
+               "  -k, --keep                    keep (don't delete) input files\n"
+               "  -l, --list                    print (un)compressed file sizes\n"
+               "  -m, --merge                   repair errors in file using several copies\n"
+               "  -o, --output=<file>           place the output into <file>\n"
+               "  -q, --quiet                   suppress all messages\n"
+               "  -R, --byte-repair             try to repair a corrupt byte in file\n"
+               "  -s, --split                   split multimember file in single-member files\n"
+               "  -t, --test                    test compressed file integrity\n"
+               "  -v, --verbose                 be verbose (a 2nd -v gives more)\n"
+               "      --dump=<list>:d:e:t       dump members, damaged/empty, tdata to stdout\n"
+               "      --remove=<list>:d:e:t     remove members, tdata from files in place\n"
+               "      --strip=<list>:d:e:t      copy files to stdout stripping members given\n"
+               "      --empty-error             exit with error status if empty member in file\n"
+               "      --marking-error           exit with error status if 1st LZMA byte not 0\n"
+               "      --loose-trailing          allow trailing data seeming corrupt header\n"
+               "      --clear-marking           reset the first LZMA byte of each member\n" );
+  if( verbosity >= 1 )
+    {
+    std::printf( "\nDebug options for experts:\n"
+                 "  -E, --debug-reproduce=<range>[,ss]  set range to 0 and try to reproduce file\n"
+                 "  -M, --md5sum                      print the MD5 digests of the input files\n"
+                 "  -S, --nrep-stats[=<val>]          print stats of N-byte repeated sequences\n"
+                 "  -U, --unzcrash=1|B<size>          test 1-bit or block errors in input file\n"
+                 "  -W, --debug-decompress=<pos>,<val>  set pos to val and decompress to stdout\n"
+                 "  -X, --show-packets[=<pos>,<val>]  show in stdout the decoded LZMA packets\n"
+                 "  -Y, --debug-delay=<range>         find max error detection delay in <range>\n"
+                 "  -Z, --debug-byte-repair=<pos>,<val>  test repair one-byte error at <pos>\n" );
+    }
+  std::printf( "\nIf no file names are given, or if a file is '-', lziprecover decompresses\n"
+               "from standard input to standard output.\n"
+               "Numbers may be followed by a multiplier: k = kB = 10^3 = 1000,\n"
+               "Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...\n"
+               "\nTo extract all the files from archive 'foo.tar.lz', use the commands\n"
+               "'tar -xf foo.tar.lz' or 'lziprecover -cd foo.tar.lz | tar -xf -'.\n"
+               "\nExit status: 0 for a normal exit, 1 for environmental problems\n"
+               "(file not found, invalid command-line options, I/O errors, etc), 2 to\n"
+               "indicate a corrupt or invalid input file, 3 for an internal consistency\n"
+               "error (e.g., bug) which caused lziprecover to panic.\n"
+               "\nReport bugs to lzip-bug@nongnu.org\n"
+               "Lziprecover home page: http://www.nongnu.org/lzip/lziprecover.html\n" );
+  }
+
+} // end namespace
+
+void Pretty_print::operator()( const char * const msg, FILE * const f ) const
+  {
+  if( verbosity < 0 ) return;
+  if( first_post )
+    {
+    first_post = false;
+    std::fputs( padded_name.c_str(), f );
+    if( !msg ) std::fflush( f );
+    }
+  if( msg ) std::fprintf( f, "%s\n", msg );
+  }
+
+
+const char * bad_version( const unsigned version )
+  {
+  static char buf[80];
+  snprintf( buf, sizeof buf, "Version %u member format not supported.",
+            version );
+  return buf;
+  }
+
+
+const char * format_ds( const unsigned dictionary_size )
+  {
+  enum { bufsize = 16, factor = 1024, n = 3 };
+  static char buf[bufsize];
+  const char * const prefix[n] = { "Ki", "Mi", "Gi" };
+  const char * p = "";
+  const char * np = "  ";
+  unsigned num = dictionary_size;
+  bool exact = ( num % factor == 0 );
+
+  for( int i = 0; i < n && ( num > 9999 || ( exact && num >= factor ) ); ++i )
+    { num /= factor; if( num % factor != 0 ) exact = false;
+      p = prefix[i]; np = ""; }
+  snprintf( buf, bufsize, "%s%4u %sB", np, num, p );
+  return buf;
+  }
+
+
+void show_header( const unsigned dictionary_size )
+  {
+  std::fprintf( stderr, "dict %s, ", format_ds( dictionary_size ) );
+  }
+
+
+#include "main_common.cc"
+
+
+// Colon-separated list of "damaged", "empty", "tdata", [r][^]<list> (1 1,3-5)
+void Member_list::parse_ml( const char * const arg,
+                            const char * const option_name,
+                            Cl_options & cl_opts )
+  {
+  const char * p = arg;			// points to current char
+  while( true )
+    {
+    const char * tp = p;		// points to terminator (':' or '\0')
+    while( *tp && *tp != ':' ) ++tp;
+    const unsigned len = tp - p;
+    if( std::islower( *(const unsigned char *)p ) )
+      {
+      if( len <= 7 && std::strncmp( "damaged", p, len ) == 0 )
+        { damaged = true; cl_opts.ignore_errors = true; goto next; }
+      if( len <= 5 && std::strncmp( "empty", p, len ) == 0 )
+        { empty = true; cl_opts.ignore_empty = true; goto next; }
+      if( len <= 5 && std::strncmp( "tdata", p, len ) == 0 )
+        { tdata = true; cl_opts.ignore_trailing = true; goto next; }
+      }
+    {
+    const bool reverse = ( *p == 'r' );
+    if( reverse ) ++p;
+    if( *p == '^' ) { ++p; if( reverse ) rin = false; else in = false; }
+    std::vector< Block > * rvp = reverse ? &rrange_vector : &range_vector;
+    while( std::isdigit( *(const unsigned char *)p ) )
+      {
+      const char * tail;
+      const long pos = getnum( p, option_name, 0, 1, LONG_MAX, &tail ) - 1;
+      if( rvp->size() && pos < rvp->back().end() ) break;
+      const long size = (*tail == '-') ?
+        getnum( tail + 1, option_name, 0, pos + 1, LONG_MAX, &tail ) - pos : 1;
+      rvp->push_back( Block( pos, size ) );
+      if( tail == tp ) goto next;
+      if( *tail == ',' ) p = tail + 1; else break;
+      }
+    }
+    show_option_error( arg, "Invalid list of members in", option_name );
+    std::exit( 1 );
+next:
+    if( *(p = tp) != 0 ) ++p; else return;
+    }
+  }
+
+
+namespace {
+
+// Recognized formats: <digit> 'a' m[<match_length>]
+int parse_lzip_level( const char * const arg, const char * const option_name )
+  {
+  if( *arg == 'a' || std::isdigit( *(const unsigned char *)arg ) ) return *arg;
+  if( *arg != 'm' )
+    { show_option_error( arg, "Invalid argument in", option_name );
+      std::exit( 1 ); }
+  if( arg[1] == 0 ) return -1;
+  return -getnum( arg + 1, option_name, 0, min_match_len_limit, max_match_len );
+  }
+
+
+/* Recognized format: <range>[,<sector_size>]
+   range formats: <begin> <begin>-<end> <begin>,<size> ,<size>
+   Return a pointer to the byte following the bytes parsed.
+*/
+const char * parse_range( const char * const arg, const char * const pn,
+                          Block & range, int * const sector_sizep = 0 )
+  {
+  const char * tail = arg;
+  long long value =
+    ( arg[0] == ',' ) ? 0 : getnum( arg, pn, 0, 0, INT64_MAX - 1, &tail );
+  if( tail[0] == 0 || tail[0] == ',' || tail[0] == '-' || tail[0] == ':' )
+    {
+    range.pos( value );
+    if( tail[0] == 0 || tail[0] == ':' )
+      { range.size( INT64_MAX - value ); return tail; }
+    const bool is_size = ( tail[0] == ',' );
+    if( sector_sizep && tail[1] == ',' ) { value = INT64_MAX - value; ++tail; }
+    else value = getnum( tail + 1, pn, 0, 1, INT64_MAX, &tail );	// size
+    if( !is_size && value <= range.pos() )
+      { show_option_error( arg, "Begin must be < end in", pn ); std::exit( 1 ); }
+    if( !is_size ) value -= range.pos();		// size = end - pos
+    if( INT64_MAX - value >= range.pos() )
+      {
+      range.size( value );
+      if( sector_sizep && tail[0] == ',' )
+        *sector_sizep = getnum( tail + 1, pn, 0, 8, INT_MAX, &tail );
+      return tail;
+      }
+    }
+  show_option_error( arg, "Invalid decompression range in", pn );
+  std::exit( 1 );
+  }
+
+
+void one_file( const int files )
+  {
+  if( files != 1 )
+    {
+    show_error( "You must specify exactly 1 file.", 0, true );
+    std::exit( 1 );
+    }
+  }
+
+void at_least_one_file( const int files )
+  {
+  if( files < 1 )
+    {
+    show_error( "You must specify at least 1 file.", 0, true );
+    std::exit( 1 );
+    }
+  }
+
+
+void set_mode( Mode & program_mode, const Mode new_mode )
+  {
+  if( program_mode != m_none && program_mode != new_mode )
+    {
+    show_error( "Only one operation can be specified.", 0, true );
+    std::exit( 1 );
+    }
+  program_mode = new_mode;
+  }
+
+
+void parse_u( const char * const arg, const char * const option_name,
+              Mode & program_mode, int & sector_size )
+  {
+  if( arg[0] == '1' ) set_mode( program_mode, m_unzcrash_bit );
+  else if( arg[0] == 'B' )
+    { set_mode( program_mode, m_unzcrash_block );
+      sector_size = getnum( arg + 1, option_name, 0, 1, INT_MAX ); }
+  else
+    { show_option_error( arg, "Invalid argument in", option_name );
+      std::exit( 1 ); }
+  }
+
+
+int extension_index( const std::string & name )
+  {
+  for( int eindex = 0; known_extensions[eindex].from; ++eindex )
+    {
+    const std::string ext( known_extensions[eindex].from );
+    if( name.size() > ext.size() &&
+        name.compare( name.size() - ext.size(), ext.size(), ext ) == 0 )
+      return eindex;
+    }
+  return -1;
+  }
+
+
+void set_a_outname( const std::string & name )
+  {
+  output_filename = name;
+  if( name.size() > 5 && name.compare( name.size() - 5, 5, ".lzma" ) == 0 )
+    output_filename.erase( name.size() - 2 );
+  else if( name.size() > 4 && name.compare( name.size() - 4, 4, ".tlz" ) == 0 )
+    output_filename.insert( name.size() - 2, "ar." );
+  else if( name.size() <= 3 || name.compare( name.size() - 3, 3, ".lz" ) != 0 )
+    output_filename += known_extensions[0].from;
+  }
+
+
+void set_d_outname( const std::string & name, const int eindex )
+  {
+  if( eindex >= 0 )
+    {
+    const std::string from( known_extensions[eindex].from );
+    if( name.size() > from.size() )
+      {
+      output_filename.assign( name, 0, name.size() - from.size() );
+      output_filename += known_extensions[eindex].to;
+      return;
+      }
+    }
+  output_filename = name; output_filename += ".out";
+  if( verbosity >= 1 )
+    std::fprintf( stderr, "%s: %s: Can't guess original name -- using '%s'\n",
+                  program_name, name.c_str(), output_filename.c_str() );
+  }
+
+} // end namespace
+
+int open_instream( const char * const name, struct stat * const in_statsp,
+                   const bool one_to_one, const bool reg_only )
+  {
+  int infd = open( name, O_RDONLY | O_BINARY );
+  if( infd < 0 )
+    show_file_error( name, "Can't open input file", 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 ) && ( !can_read || one_to_one ) ) )
+      {
+      if( verbosity >= 0 )
+        std::fprintf( stderr, "%s: %s: Input file is not a regular file%s.\n",
+                      program_name, name, ( can_read && one_to_one ) ?
+                      ",\n  and neither '-c' nor '-o' were specified" : "" );
+      close( infd );
+      infd = -1;
+      }
+    }
+  return infd;
+  }
+
+
+int open_truncable_stream( const char * const name,
+                           struct stat * const in_statsp )
+  {
+  int fd = open( name, O_RDWR | O_BINARY );
+  if( fd < 0 )
+    show_file_error( name, "Can't open input file", errno );
+  else
+    {
+    const int i = fstat( fd, in_statsp );
+    const mode_t mode = in_statsp->st_mode;
+    if( i != 0 || !S_ISREG( mode ) )
+      { show_file_error( name, "Not a regular file." ); close( fd ); fd = -1; }
+    }
+  return fd;
+  }
+
+namespace {
+
+bool make_dirs( const std::string & name )
+  {
+  int i = name.size();
+  while( i > 0 && name[i-1] != '/' ) --i;	// remove last component
+  while( i > 0 && name[i-1] == '/' ) --i;	// remove slash(es)
+  const int dirsize = i;	// size of dirname without trailing slash(es)
+
+  for( i = 0; i < dirsize; )	// if dirsize == 0, dirname is '/' or empty
+    {
+    while( i < dirsize && name[i] == '/' ) ++i;
+    const int first = i;
+    while( i < dirsize && name[i] != '/' ) ++i;
+    if( first < i )
+      {
+      const std::string partial( name, 0, i );
+      const mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
+      struct stat st;
+      if( stat( partial.c_str(), &st ) == 0 )
+        { if( !S_ISDIR( st.st_mode ) ) { errno = ENOTDIR; return false; } }
+      else if( mkdir( partial.c_str(), mode ) != 0 && errno != EEXIST )
+        return false;		// if EEXIST, another process created the dir
+      }
+    }
+  return true;
+  }
+
+const char * const force_msg =
+  "Output file already exists. Use '--force' to overwrite it.";
+
+} // end namespace
+
+bool open_outstream( const bool force, const bool protect,
+                     const bool rw, const bool skipping, const bool to_file )
+  {
+  const mode_t usr_rw = S_IRUSR | S_IWUSR;
+  const mode_t all_rw = usr_rw | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
+  const mode_t outfd_mode = protect ? usr_rw : all_rw;
+  int flags = O_CREAT | ( rw ? O_RDWR : O_WRONLY ) | O_BINARY;
+  if( force ) flags |= O_TRUNC; else flags |= O_EXCL;
+
+  outfd = -1;
+  if( output_filename.size() &&
+      output_filename[output_filename.size()-1] == '/' ) errno = EISDIR;
+  else {
+    if( ( !protect || to_file ) && !make_dirs( output_filename ) )
+      { show_file_error( output_filename.c_str(),
+          "Error creating intermediate directory", errno ); return false; }
+    outfd = open( output_filename.c_str(), flags, outfd_mode );
+    if( outfd >= 0 ) { delete_output_on_interrupt = true; return true; }
+    if( errno == EEXIST )
+      { show_file_error( output_filename.c_str(), skipping ?
+        "Output file already exists, skipping." : force_msg ); return false; }
+    }
+  show_file_error( output_filename.c_str(), "Can't create output file", errno );
+  return false;
+  }
+
+
+bool output_file_exists()
+  {
+  struct stat st;
+  if( stat( output_filename.c_str(), &st ) == 0 )
+    { show_file_error( output_filename.c_str(), force_msg ); return true; }
+  return false;
+  }
+
+
+void set_signals( void (*action)(int) )
+  {
+  std::signal( SIGHUP, action );
+  std::signal( SIGINT, action );
+  std::signal( SIGTERM, action );
+  }
+
+
+void cleanup_and_fail( const int retval )
+  {
+  set_signals( SIG_IGN );			// ignore signals
+  if( delete_output_on_interrupt )
+    {
+    delete_output_on_interrupt = false;
+    show_file_error( output_filename.c_str(),
+                     "Deleting output file, if it exists." );
+    if( outfd >= 0 ) { close( outfd ); outfd = -1; }
+    if( std::remove( output_filename.c_str() ) != 0 && errno != ENOENT )
+      show_error( "warning: deletion of output file failed", errno );
+    }
+  std::exit( retval );
+  }
+
+
+bool check_tty_out()
+  {
+  if( isatty( outfd ) )
+    { show_file_error( output_filename.size() ?
+                       output_filename.c_str() : "(stdout)",
+                       "I won't write compressed data to a terminal." );
+      return false; }
+  return true;
+  }
+
+namespace {
+
+extern "C" void signal_handler( int )
+  {
+  show_error( "Control-C or similar caught, quitting." );
+  cleanup_and_fail( 1 );
+  }
+
+
+bool check_tty_in( const char * const input_filename, const int infd,
+                   const Mode program_mode, int & retval )
+  {
+  if( isatty( infd ) )			// all modes read compressed data
+    { show_file_error( input_filename,
+                       "I won't read compressed data from a terminal." );
+      close( infd ); set_retval( retval, 2 );
+      if( program_mode != m_test ) cleanup_and_fail( retval );
+      return false; }
+  return true;
+  }
+
+bool check_tty_out( const Mode program_mode )
+  { return program_mode != m_alone_to_lz || ::check_tty_out(); }
+
+
+// Set permissions, owner, and times.
+void close_and_set_permissions( const struct stat * const in_statsp )
+  {
+  bool warning = false;
+  if( in_statsp )
+    {
+    const mode_t mode = in_statsp->st_mode;
+    // fchown in many cases returns with EPERM, which can be safely ignored.
+    if( fchown( outfd, in_statsp->st_uid, in_statsp->st_gid ) == 0 )
+      { if( fchmod( outfd, mode ) != 0 ) warning = true; }
+    else
+      if( errno != EPERM ||
+          fchmod( outfd, mode & ~( S_ISUID | S_ISGID | S_ISVTX ) ) != 0 )
+        warning = true;
+    }
+  if( close( outfd ) != 0 )
+    { show_file_error( output_filename.c_str(), "Error closing output file",
+                       errno ); 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_file_error( output_filename.c_str(),
+                     "warning: can't change output file attributes", errno );
+  }
+
+
+unsigned char xdigit( const unsigned value )	// hex digit for 'value'
+  {
+  if( value <= 9 ) return '0' + value;
+  if( value <= 15 ) return 'A' + value - 10;
+  return 0;
+  }
+
+
+bool show_trailing_data( const uint8_t * const data, const int size,
+                         const Pretty_print & pp, const bool all,
+                         const int ignore_trailing )	// -1 = show
+  {
+  if( verbosity >= 4 || ignore_trailing <= 0 )
+    {
+    std::string msg;
+    if( !all ) msg = "first bytes of ";
+    msg += "trailing data = ";
+    for( int i = 0; i < size; ++i )
+      {
+      msg += xdigit( data[i] >> 4 );
+      msg += xdigit( data[i] & 0x0F );
+      msg += ' ';
+      }
+    msg += '\'';
+    for( int i = 0; i < size; ++i )
+      { if( std::isprint( data[i] ) ) msg += data[i]; else msg += '.'; }
+    msg += '\'';
+    pp( msg.c_str() );
+    if( ignore_trailing == 0 ) show_file_error( pp.name(), trailing_msg );
+    }
+  return ignore_trailing > 0;
+  }
+
+
+int decompress( const unsigned long long cfile_size, const int infd,
+                const Cl_options & cl_opts, const Pretty_print & pp,
+                const bool testing )
+  {
+  unsigned long long partial_file_pos = 0;
+  Range_decoder rdec( infd );
+  int retval = 0;
+
+  for( bool first_member = true; ; first_member = false )
+    {
+    Lzip_header header;
+    rdec.reset_member_position();
+    const int size = rdec.read_header_carefully( header, cl_opts.ignore_errors );
+    if( rdec.finished() ||			// End Of File
+        ( size < header.size && !rdec.find_header( header ) ) )
+      {
+      if( first_member )
+        { show_file_error( pp.name(), "File ends unexpectedly at member header." );
+          retval = 2; }
+      else if( header.check_prefix( size ) )
+        { pp( "Truncated header in multimember file." );
+          show_trailing_data( header.data, size, pp, true, -1 ); retval = 2; }
+      else if( size > 0 && !show_trailing_data( header.data, size, pp, true,
+                                 cl_opts.ignore_trailing ) ) retval = 2;
+      break;
+      }
+    if( !header.check_magic() )
+      {
+      if( first_member )
+        { show_file_error( pp.name(), bad_magic_msg ); retval = 2; }
+      else if( !cl_opts.loose_trailing && header.check_corrupt() )
+        { pp( corrupt_mm_msg );
+          show_trailing_data( header.data, size, pp, false, -1 ); retval = 2; }
+      else if( !show_trailing_data( header.data, size, pp, false,
+                                    cl_opts.ignore_trailing ) ) retval = 2;
+      if( cl_opts.ignore_errors ) { pp.reset(); continue; } else break;
+      }
+    if( !header.check_version() )
+      { pp( bad_version( header.version() ) ); retval = 2;
+        if( cl_opts.ignore_errors ) { pp.reset(); continue; } else break; }
+    const unsigned dictionary_size = header.dictionary_size();
+    if( !isvalid_ds( dictionary_size ) )
+      { pp( bad_dict_msg ); retval = 2;
+        if( cl_opts.ignore_errors ) { pp.reset(); continue; } else break; }
+
+    if( verbosity >= 2 || ( verbosity == 1 && first_member ) ) pp();
+
+    LZ_decoder decoder( rdec, dictionary_size, outfd );
+    show_dprogress( cfile_size, partial_file_pos, &rdec, &pp );	// init
+    const int result = decoder.decode_member( cl_opts, pp );
+    partial_file_pos += rdec.member_position();
+    if( result != 0 )
+      {
+      retval = 2;
+      if( verbosity >= 0 && result <= 2 )
+        {
+        pp();
+        std::fprintf( stderr, "%s at pos %llu\n", ( result == 2 ) ?
+                      "File ends unexpectedly" : "Decoder error",
+                      partial_file_pos );
+        }
+      else if( result == 5 ) { pp( empty_msg ); break; }
+      else if( result == 6 ) { pp( marking_msg ); break; }
+      if( cl_opts.ignore_errors ) { pp.reset(); continue; } else break;
+      }
+    if( verbosity >= 2 )
+      { std::fputs( testing ? "ok\n" : "done\n", stderr ); pp.reset(); }
+    }
+  if( verbosity == 1 && retval == 0 )
+    std::fputs( testing ? "ok\n" : "done\n", stderr );
+  if( retval == 2 && cl_opts.ignore_errors ) retval = 0;
+  return retval;
+  }
+
+} // end namespace
+
+void set_signal_handler() { set_signals( signal_handler ); }
+
+bool close_outstream( const struct stat * const in_statsp )
+  {
+  if( delete_output_on_interrupt ) close_and_set_permissions( in_statsp );
+  if( outfd >= 0 && close( outfd ) != 0 )
+    { show_error( "Error closing stdout", errno ); return false; }
+  outfd = -1;
+  return true;
+  }
+
+
+std::string insert_fixed( std::string name )
+  {
+  if( name.size() > 7 && name.compare( name.size() - 7, 7, ".tar.lz" ) == 0 )
+    name.insert( name.size() - 7, "_fixed" );
+  else if( name.size() > 3 && name.compare( name.size() - 3, 3, ".lz" ) == 0 )
+    name.insert( name.size() - 3, "_fixed" );
+  else if( name.size() > 4 && name.compare( name.size() - 4, 4, ".tlz" ) == 0 )
+    name.insert( name.size() - 4, "_fixed" );
+  else name += "_fixed.lz";
+  return name;
+  }
+
+
+void show_2file_error( const char * const msg1, const char * const name1,
+                       const char * const name2, const char * const msg2 )
+  {
+  if( verbosity >= 0 )
+    std::fprintf( stderr, "%s: %s '%s' and '%s' %s\n",
+                  program_name, msg1, name1, name2, msg2 );
+  }
+
+
+void show_dprogress( const unsigned long long cfile_size,
+                     const unsigned long long partial_size,
+                     const Range_decoder * const d,
+                     const Pretty_print * const p )
+  {
+  static unsigned long long csize = 0;		// file_size / 100
+  static unsigned long long psize = 0;
+  static const Range_decoder * rdec = 0;
+  static const Pretty_print * pp = 0;
+  static int counter = 0;
+  static bool enabled = true;
+
+  if( !enabled ) return;
+  if( p )					// initialize static vars
+    {
+    if( verbosity < 2 || !isatty( STDERR_FILENO ) ) { enabled = false; return; }
+    csize = cfile_size; psize = partial_size; rdec = d; pp = p; counter = 0;
+    }
+  if( rdec && pp && --counter <= 0 )
+    {
+    const unsigned long long pos = psize + rdec->member_position();
+    counter = 7;		// update display every 114688 bytes
+    if( csize > 0 )
+      std::fprintf( stderr, "%4llu%%  %.1f MB\r", pos / csize, pos / 1000000.0 );
+    else
+      std::fprintf( stderr, "  %.1f MB\r", pos / 1000000.0 );
+    pp->reset(); (*pp)();			// restore cursor position
+    }
+  }
+
+
+int main( const int argc, const char * const argv[] )
+  {
+  Block range( 0, 0 );
+  int sector_size = INT_MAX;		// default larger than practical range
+  Bad_byte bad_byte;
+  Member_list member_list;
+  std::string default_output_filename;
+  const char * lzip_name = "lzip";		// default is lzip
+  const char * reference_filename = 0;
+  Mode program_mode = m_none;
+  int lzip_level = 0;		//  0 = test all levels and match lengths
+				// '0'..'9' = level, 'a' = all levels
+				// -5..-273 = match length, -1 = all lengths
+  int repeated_byte = -1;	// 0 to 255, or -1 for all values
+  Cl_options cl_opts;		// command-line options
+  bool force = false;
+  bool keep_input_files = false;
+  bool to_stdout = false;
+  if( argc > 0 ) invocation_name = argv[0];
+
+  enum { opt_cm = 256, opt_du, opt_eer, opt_lt, opt_lzl, opt_lzn, opt_mer,
+         opt_ref, opt_rem, opt_st };
+  const Arg_parser::Option options[] =
+    {
+    { 'a', "trailing-error",     Arg_parser::no  },
+    { 'A', "alone-to-lz",        Arg_parser::no  },
+    { 'c', "stdout",             Arg_parser::no  },
+    { 'd', "decompress",         Arg_parser::no  },
+    { 'D', "range-decompress",   Arg_parser::yes },
+    { 'e', "reproduce",          Arg_parser::no  },
+    { 'E', "debug-reproduce",    Arg_parser::yes },
+    { 'f', "force",              Arg_parser::no  },
+    { 'h', "help",               Arg_parser::no  },
+    { 'i', "ignore-errors",      Arg_parser::no  },
+    { 'k', "keep",               Arg_parser::no  },
+    { 'l', "list",               Arg_parser::no  },
+    { 'm', "merge",              Arg_parser::no  },
+    { 'M', "md5sum",             Arg_parser::no  },
+    { 'n', "threads",            Arg_parser::yes },
+    { 'o', "output",             Arg_parser::yes },
+    { 'q', "quiet",              Arg_parser::no  },
+    { 'R', "byte-repair",        Arg_parser::no  },
+    { 'R', "repair",             Arg_parser::no  },
+    { 's', "split",              Arg_parser::no  },
+    { 'S', "nrep-stats",         Arg_parser::maybe },
+    { 't', "test",               Arg_parser::no  },
+    { 'U', "unzcrash",           Arg_parser::yes },
+    { 'v', "verbose",            Arg_parser::no  },
+    { 'V', "version",            Arg_parser::no  },
+    { 'W', "debug-decompress",   Arg_parser::yes },
+    { 'X', "show-packets",       Arg_parser::maybe },
+    { 'Y', "debug-delay",        Arg_parser::yes },
+    { 'Z', "debug-byte-repair",  Arg_parser::yes },
+    { opt_cm,  "clear-marking",  Arg_parser::no  },
+    { opt_du,  "dump",           Arg_parser::yes },
+    { opt_eer, "empty-error",    Arg_parser::no  },
+    { opt_lt,  "loose-trailing", Arg_parser::no  },
+    { opt_lzl, "lzip-level",     Arg_parser::yes },
+    { opt_lzn, "lzip-name",      Arg_parser::yes },
+    { opt_mer, "marking-error",  Arg_parser::no  },
+    { opt_ref, "reference-file", Arg_parser::yes },
+    { opt_rem, "remove",         Arg_parser::yes },
+    { opt_st,  "strip",          Arg_parser::yes },
+    {  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
+    const char * const pn = parser.parsed_name( argind ).c_str();
+    const std::string & sarg = parser.argument( argind );
+    const char * const arg = sarg.c_str();
+    switch( code )
+      {
+      case 'a': cl_opts.ignore_trailing = false; break;
+      case 'A': set_mode( program_mode, m_alone_to_lz ); break;
+      case 'c': to_stdout = true; break;
+      case 'd': set_mode( program_mode, m_decompress ); break;
+      case 'D': set_mode( program_mode, m_range_dec );
+                parse_range( arg, pn, range ); break;
+      case 'e': set_mode( program_mode, m_reproduce ); break;
+      case 'E': set_mode( program_mode, m_reproduce );
+                parse_range( arg, pn, range, &sector_size ); break;
+      case 'f': force = true; break;
+      case 'h': show_help(); return 0;
+      case 'i': cl_opts.ignore_errors = true; break;
+      case 'k': keep_input_files = true; break;
+      case 'l': set_mode( program_mode, m_list ); break;
+      case 'm': set_mode( program_mode, m_merge ); break;
+      case 'M': set_mode( program_mode, m_md5sum ); break;
+      case 'n': break;
+      case 'o': if( sarg == "-" ) to_stdout = true;
+                else { default_output_filename = sarg; } break;
+      case 'q': verbosity = -1; break;
+      case 'R': set_mode( program_mode, m_byte_repair ); break;
+      case 's': set_mode( program_mode, m_split ); break;
+      case 'S': if( arg[0] ) repeated_byte = getnum( arg, pn, 0, 0, 255 );
+                set_mode( program_mode, m_nrep_stats ); break;
+      case 't': set_mode( program_mode, m_test ); break;
+      case 'U': parse_u( arg, pn, program_mode, sector_size ); break;
+      case 'v': if( verbosity < 4 ) ++verbosity; break;
+      case 'V': show_version(); return 0;
+      case 'W': set_mode( program_mode, m_debug_decompress );
+                bad_byte.parse_bb( arg, pn ); break;
+      case 'X': set_mode( program_mode, m_show_packets );
+                if( arg[0] ) { bad_byte.parse_bb( arg, pn ); } break;
+      case 'Y': set_mode( program_mode, m_debug_delay );
+                parse_range( arg, pn, range ); break;
+      case 'Z': set_mode( program_mode, m_debug_byte_repair );
+                bad_byte.parse_bb( arg, pn ); break;
+      case opt_cm: set_mode( program_mode, m_clear_marking );
+                   cl_opts.ignore_marking = true; break;
+      case opt_du: set_mode( program_mode, m_dump );
+                   member_list.parse_ml( arg, pn, cl_opts ); break;
+      case opt_eer: cl_opts.ignore_empty = false; break;
+      case opt_lt:  cl_opts.loose_trailing = true; break;
+      case opt_lzl: lzip_level = parse_lzip_level( arg, pn ); break;
+      case opt_lzn: lzip_name = arg; break;
+      case opt_mer: cl_opts.ignore_marking = false; break;
+      case opt_ref: reference_filename = arg; break;
+      case opt_rem: set_mode( program_mode, m_remove );
+                    member_list.parse_ml( arg, pn, cl_opts ); break;
+      case opt_st: set_mode( program_mode, m_strip );
+                   member_list.parse_ml( arg, pn, cl_opts ); break;
+      default: internal_error( "uncaught option." );
+      }
+    } // end process options
+
+#if defined __MSVCRT__ || defined __OS2__ || defined __DJGPP__
+  setmode( STDIN_FILENO, O_BINARY );
+  setmode( STDOUT_FILENO, O_BINARY );
+#endif
+
+  if( program_mode == m_none )
+    {
+    show_error( "You must specify the operation to be performed.", 0, true );
+    return 1;
+    }
+
+  std::vector< std::string > filenames;
+  bool filenames_given = false;
+  for( ; argind < parser.arguments(); ++argind )
+    {
+    filenames.push_back( parser.argument( argind ) );
+    if( filenames.back() != "-" ) filenames_given = true;
+    }
+
+  const char terminator = isatty( STDOUT_FILENO ) ? '\r' : '\n';
+  try {
+  switch( program_mode )
+    {
+    case m_none: internal_error( "invalid operation." ); break;
+    case m_alone_to_lz: break;
+    case m_byte_repair:
+      one_file( filenames.size() );
+      return byte_repair( filenames[0], default_output_filename, cl_opts,
+                          terminator, force );
+    case m_clear_marking:
+      at_least_one_file( filenames.size() );
+      return clear_marking( filenames, cl_opts );
+    case m_debug_byte_repair:
+      one_file( filenames.size() );
+      return debug_byte_repair( filenames[0].c_str(), cl_opts, bad_byte, terminator );
+    case m_debug_decompress:
+      one_file( filenames.size() );
+      return debug_decompress( filenames[0].c_str(), cl_opts, bad_byte, false );
+    case m_debug_delay:
+      one_file( filenames.size() );
+      return debug_delay( filenames[0].c_str(), cl_opts, range, terminator );
+    case m_decompress: break;
+    case m_dump:
+    case m_strip:
+      at_least_one_file( filenames.size() );
+      return dump_members( filenames, default_output_filename, cl_opts,
+                      member_list, force, program_mode == m_strip, to_stdout );
+    case m_list: break;
+    case m_md5sum: break;
+    case m_merge:
+      if( filenames.size() < 2 )
+        { show_error( "You must specify at least 2 files.", 0, true ); return 1; }
+      return merge_files( filenames, default_output_filename, cl_opts,
+                          terminator, force );
+    case m_nrep_stats:
+      return print_nrep_stats( filenames, cl_opts, repeated_byte );
+    case m_range_dec:
+      one_file( filenames.size() );
+      return range_decompress( filenames[0], default_output_filename,
+                               cl_opts, range, force, to_stdout );
+    case m_remove:
+      at_least_one_file( filenames.size() );
+      return remove_members( filenames, cl_opts, member_list );
+    case m_reproduce:
+      one_file( filenames.size() );
+      if( !reference_filename || !reference_filename[0] )
+        { show_error( "You must specify a reference file.", 0, true ); return 1; }
+      if( range.size() > 0 )
+        return debug_reproduce_file( filenames[0].c_str(), lzip_name,
+                 reference_filename, cl_opts, range, sector_size, lzip_level );
+      else
+        return reproduce_file( filenames[0], default_output_filename, lzip_name,
+                 reference_filename, cl_opts, lzip_level, terminator, force );
+    case m_show_packets:
+      one_file( filenames.size() );
+      return debug_decompress( filenames[0].c_str(), cl_opts, bad_byte, true );
+    case m_split:
+      one_file( filenames.size() );
+      return split_file( filenames[0], default_output_filename, cl_opts, force );
+    case m_test: break;
+    case m_unzcrash_bit:
+      one_file( filenames.size() );
+      return lunzcrash_bit( filenames[0].c_str(), cl_opts );
+    case m_unzcrash_block:
+      one_file( filenames.size() );
+      return lunzcrash_block( filenames[0].c_str(), cl_opts, sector_size );
+    }
+    }
+  catch( std::bad_alloc & ) { show_error( mem_msg ); cleanup_and_fail( 1 ); }
+  catch( Error & e ) { show_error( e.msg, errno ); cleanup_and_fail( 1 ); }
+
+  if( filenames.empty() ) filenames.push_back("-");
+
+  if( program_mode == m_list ) return list_files( filenames, cl_opts );
+  if( program_mode == m_md5sum ) return md5sum_files( filenames );
+
+  if( program_mode != m_alone_to_lz && program_mode != m_decompress &&
+      program_mode != m_test )
+    internal_error( "invalid decompressor operation." );
+
+  if( program_mode == m_test ) to_stdout = false;	// apply overrides
+  if( program_mode == m_test || to_stdout ) default_output_filename.clear();
+
+  if( to_stdout && program_mode != m_test )	// check tty only once
+    { outfd = STDOUT_FILENO; if( !check_tty_out( program_mode ) ) return 1; }
+  else outfd = -1;
+
+  const bool to_file = !to_stdout && program_mode != m_test &&
+                       default_output_filename.size();
+  if( !to_stdout && program_mode != m_test && ( filenames_given || to_file ) )
+    set_signals( signal_handler );
+
+  Pretty_print pp( filenames );
+
+  int failed_tests = 0;
+  int retval = 0;
+  const bool one_to_one = !to_stdout && program_mode != m_test && !to_file;
+  bool stdin_used = false;
+  struct stat in_stats;
+  for( unsigned i = 0; i < filenames.size(); ++i )
+    {
+    std::string input_filename;
+    int infd;
+
+    pp.set_name( filenames[i] );
+    if( filenames[i] == "-" )
+      {
+      if( stdin_used ) continue; else stdin_used = true;
+      infd = STDIN_FILENO;
+      if( !check_tty_in( pp.name(), infd, program_mode, retval ) ) continue;
+      if( one_to_one ) { outfd = STDOUT_FILENO; output_filename.clear(); }
+      }
+    else
+      {
+      input_filename = filenames[i];
+      infd = open_instream( input_filename.c_str(), &in_stats, one_to_one );
+      if( infd < 0 ) { set_retval( retval, 1 ); continue; }
+      if( !check_tty_in( pp.name(), infd, program_mode, retval ) ) continue;
+      if( one_to_one )			// open outfd after checking infd
+        {
+        if( program_mode == m_alone_to_lz ) set_a_outname( input_filename );
+        else set_d_outname( input_filename, extension_index( input_filename ) );
+        if( !open_outstream( force, true ) )
+          { close( infd ); set_retval( retval, 1 ); continue; }
+        }
+      }
+
+    if( one_to_one && !check_tty_out( program_mode ) )
+      { set_retval( retval, 1 ); return retval; }	// don't delete a tty
+
+    if( to_file && outfd < 0 )		// open outfd after checking infd
+      {
+      output_filename = default_output_filename;
+      if( !open_outstream( force, false ) || !check_tty_out( program_mode ) )
+        return 1;	// check tty only once and don't try to delete a tty
+      }
+
+    const struct stat * const in_statsp =
+      ( input_filename.size() && one_to_one ) ? &in_stats : 0;
+    const unsigned long long cfile_size =
+      ( input_filename.size() && S_ISREG( in_stats.st_mode ) ) ?
+        ( in_stats.st_size + 99 ) / 100 : 0;
+    int tmp;
+    try {
+      if( program_mode == m_alone_to_lz )
+        tmp = alone_to_lz( infd, pp );
+      else
+        tmp = decompress( cfile_size, infd, cl_opts, pp, program_mode == m_test );
+      }
+    catch( std::bad_alloc & ) { pp( mem_msg ); tmp = 1; }
+    catch( Error & e ) { pp(); show_error( e.msg, errno ); tmp = 1; }
+    if( close( infd ) != 0 )
+      { show_file_error( pp.name(), "Error closing input file", errno );
+        set_retval( tmp, 1 ); }
+    set_retval( retval, tmp );
+    if( tmp )
+      { if( program_mode != m_test ) cleanup_and_fail( retval );
+        else ++failed_tests; }
+
+    if( delete_output_on_interrupt && one_to_one )
+      close_and_set_permissions( in_statsp );
+    if( input_filename.size() && !keep_input_files && one_to_one &&
+        ( program_mode != m_decompress || !cl_opts.ignore_errors ) )
+      std::remove( input_filename.c_str() );
+    }
+  if( delete_output_on_interrupt )					// -o
+    close_and_set_permissions( ( retval == 0 && !stdin_used &&
+      filenames_given && filenames.size() == 1 ) ? &in_stats : 0 );
+  else if( outfd >= 0 && close( outfd ) != 0 )				// -c
+    {
+    show_error( "Error closing stdout", errno );
+    set_retval( retval, 1 );
+    }
+  if( failed_tests > 0 && verbosity >= 1 && filenames.size() > 1 )
+    std::fprintf( stderr, "%s: warning: %d %s failed the test.\n",
+                  program_name, failed_tests,
+                  ( failed_tests == 1 ) ? "file" : "files" );
+  return retval;
+  }