text: /*  Lzip - LZMA lossless data compressor
      Copyright (C) 2008-2017 Antonio Diaz Diaz.
  
      This program is free software: you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation, either version 2 of the License, or
      (at your option) any later version.
  
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
  
      You should have received a copy of the GNU General Public License
      along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
  /*
      Exit status: 0 for a normal exit, 1 for environmental problems
      (file not found, invalid flags, I/O errors, etc), 2 to indicate a
      corrupt or invalid input file, 3 for an internal consistency error
      (eg, bug) which caused lzip to panic.
  */
  
  #define _FILE_OFFSET_BITS 64
  
  #include <algorithm>
  #include <cctype>
  #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__)
  #include <io.h>
  #define fchmod(x,y) 0
  #define fchown(x,y,z) 0
  #define strtoull std::strtoul
  #define SIGHUP SIGTERM
  #define S_ISSOCK(x) 0
  #define S_IRGRP 0
  #define S_IWGRP 0
  #define S_IROTH 0
  #define S_IWOTH 0
  #endif
  #if defined(__OS2__)
  #include <io.h>
  #endif
  
  #include "arg_parser.h"
  #include "lzip.h"
  #include "decoder.h"
  #include "encoder_base.h"
  #include "encoder.h"
  #include "fast_encoder.h"
  
  #ifndef O_BINARY
  #define O_BINARY 0
  #endif
  
  #if CHAR_BIT != 8
  #error "Environments where CHAR_BIT != 8 are not supported."
  #endif
  
  int verbosity = 0;
  
  namespace {
  
  const char * const Program_name = "Lzip";
  const char * const program_name = "lzip";
  const char * const program_year = "2017";
  const char * invocation_name = 0;
  
  const struct { const char * from; const char * to; } known_extensions[] = {
    { ".lz",  ""     },
    { ".tlz", ".tar" },
    { 0,      0      } };
  
  struct Lzma_options
    {
    int dictionary_size;		// 4 KiB .. 512 MiB
    int match_len_limit;		// 5 .. 273
    };
  
  enum Mode { m_compress, m_decompress, m_list, m_test };
  
  std::string output_filename;
  int outfd = -1;
  bool delete_output_on_interrupt = false;
  
  
  void show_help()
    {
    std::printf( "%s - LZMA lossless data compressor.\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"
                 "  -a, --trailing-error           exit with error status if trailing data\n"
                 "  -b, --member-size=<bytes>      set member size limit in bytes\n"
                 "  -c, --stdout                   write to standard output, keep input files\n"
                 "  -d, --decompress               decompress\n"
                 "  -f, --force                    overwrite existing output files\n"
                 "  -F, --recompress               force re-compression of compressed files\n"
                 "  -k, --keep                     keep (don't delete) input files\n"
                 "  -l, --list                     print (un)compressed file sizes\n"
                 "  -m, --match-length=<bytes>     set match length limit in bytes [36]\n"
                 "  -o, --output=<file>            if reading standard input, write to <file>\n"
                 "  -q, --quiet                    suppress all messages\n"
                 "  -s, --dictionary-size=<bytes>  set dictionary size limit in bytes [8 MiB]\n"
                 "  -S, --volume-size=<bytes>      set volume size limit in bytes\n"
                 "  -t, --test                     test compressed file integrity\n"
                 "  -v, --verbose                  be verbose (a 2nd -v gives more)\n"
                 "  -0 .. -9                       set compression level [default 6]\n"
                 "      --fast                     alias for -0\n"
                 "      --best                     alias for -9\n"
                 "If no file names are given, or if a file is '-', lzip compresses or\n"
                 "decompresses 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"
                 "Dictionary sizes 12 to 29 are interpreted as powers of two, meaning 2^12\n"
                 "to 2^29 bytes.\n"
                 "\nThe bidimensional parameter space of LZMA can't be mapped to a linear\n"
                 "scale optimal for all files. If your files are large, very repetitive,\n"
                 "etc, you may need to use the --dictionary-size and --match-length\n"
                 "options directly to achieve optimal performance.\n"
                 "\nExit status: 0 for a normal exit, 1 for environmental problems (file\n"
                 "not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or\n"
                 "invalid input file, 3 for an internal consistency error (eg, bug) which\n"
                 "caused lzip to panic.\n"
                 "\nReport bugs to lzip-bug@nongnu.org\n"
                 "Lzip home page: http://www.nongnu.org/lzip/lzip.html\n" );
    }
  
  
  void show_version()
    {
    std::printf( "%s %s\n", program_name, PROGVERSION );
    std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
    std::printf( "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\n"
                 "This is free software: you are free to change and redistribute it.\n"
                 "There is NO WARRANTY, to the extent permitted by law.\n" );
    }
  
  } // end namespace
  
  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 };
    static char buf[bufsize];
    const char * const prefix[8] =
      { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
    const char * p = "";
    const char * np = "  ";
    unsigned num = dictionary_size;
    bool exact = ( num % factor == 0 );
  
    for( int i = 0; i < 8 && ( 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;
    }
  
  namespace {
  
  void show_header( const unsigned dictionary_size )
    {
    if( verbosity >= 3 )
      std::fprintf( stderr, "dictionary %s.  ", format_ds( dictionary_size ) );
    }
  
  
  unsigned long long getnum( const char * const ptr,
                             const unsigned long long llimit,
                             const unsigned long long ulimit )
    {
    char * tail;
    errno = 0;
    unsigned long long result = strtoull( ptr, &tail, 0 );
    if( tail == ptr )
      {
      show_error( "Bad or missing numerical argument.", 0, true );
      std::exit( 1 );
      }
  
    if( !errno && tail[0] )
      {
      const unsigned factor = ( tail[1] == 'i' ) ? 1024 : 1000;
      int exponent = 0;				// 0 = bad multiplier
      switch( tail[0] )
        {
        case 'Y': exponent = 8; break;
        case 'Z': exponent = 7; break;
        case 'E': exponent = 6; break;
        case 'P': exponent = 5; break;
        case 'T': exponent = 4; break;
        case 'G': exponent = 3; break;
        case 'M': exponent = 2; break;
        case 'K': if( factor == 1024 ) exponent = 1; break;
        case 'k': if( factor == 1000 ) exponent = 1; break;
        }
      if( exponent <= 0 )
        {
        show_error( "Bad multiplier in numerical argument.", 0, true );
        std::exit( 1 );
        }
      for( int i = 0; i < exponent; ++i )
        {
        if( ulimit / factor >= result ) result *= factor;
        else { errno = ERANGE; break; }
        }
      }
    if( !errno && ( result < llimit || result > ulimit ) ) errno = ERANGE;
    if( errno )
      {
      show_error( "Numerical argument out of limits." );
      std::exit( 1 );
      }
    return result;
    }
  
  
  int get_dict_size( const char * const arg )
    {
    char * tail;
    const long bits = std::strtol( arg, &tail, 0 );
    if( bits >= min_dictionary_bits &&
        bits <= max_dictionary_bits && *tail == 0 )
      return ( 1 << bits );
    return getnum( arg, min_dictionary_size, max_dictionary_size );
    }
  
  
  void set_mode( Mode & program_mode, const Mode new_mode )
    {
    if( program_mode != m_compress && 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 )
    {
    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;
    }
  
  } // end namespace
  
  int open_instream( const char * const name, struct stat * const in_statsp,
                     const bool no_ofile, 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 || !no_ofile ) ) )
        {
        if( verbosity >= 0 )
          std::fprintf( stderr, "%s: Input file '%s' is not a regular file%s.\n",
                        program_name, name,
                        ( can_read && !no_ofile ) ?
                        ",\n      and '--stdout' was not specified" : "" );
        close( infd );
        infd = -1;
        }
      }
    return infd;
    }
  
  namespace {
  
  int open_instream2( const char * const name, struct stat * const in_statsp,
                      const Mode program_mode, const int eindex,
                      const bool recompress, const bool to_stdout )
    {
    if( program_mode == m_compress && !recompress && eindex >= 0 )
      {
      if( verbosity >= 0 )
        std::fprintf( stderr, "%s: Input file '%s' already has '%s' suffix.\n",
                      program_name, name, known_extensions[eindex].from );
      return -1;
      }
    const bool no_ofile = ( to_stdout || program_mode == m_test );
    return open_instream( name, in_statsp, no_ofile, false );
    }
  
  
  void set_c_outname( const std::string & name, const bool multifile )
    {
    output_filename = name;
    if( multifile ) output_filename += "00001";
    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: 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, const bool from_stdin )
    {
    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 = from_stdin ? all_rw : usr_rw;
    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 ) delete_output_on_interrupt = true;
    else if( 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 char * const input_filename, const int infd,
                  const Mode program_mode )
    {
    if( program_mode == m_compress && isatty( outfd ) )
      {
      show_error( "I won't write compressed data to a terminal.", 0, true );
      return false;
      }
    if( ( program_mode == m_decompress || program_mode == m_test ) &&
        isatty( infd ) )
      {
      show_file_error( input_filename,
                       "I won't read compressed data from a terminal." );
      return false;
      }
    return true;
    }
  
  
  void cleanup_and_fail( const int retval )
    {
    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 )
      {
      const mode_t mode = in_statsp->st_mode;
      // 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 )
        { 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_error( "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_error( "Can't change output file attributes." );
    }
  
  
  bool next_filename()
    {
    const unsigned name_len = output_filename.size();
    const unsigned ext_len = std::strlen( known_extensions[0].from );
    if( name_len >= ext_len + 5 )				// "*00001.lz"
      for( int i = name_len - ext_len - 1, j = 0; j < 5; --i, ++j )
        {
        if( output_filename[i] < '9' ) { ++output_filename[i]; return true; }
        else output_filename[i] = '0';
        }
    return false;
    }
  
  
  int compress( const unsigned long long member_size,
                const unsigned long long volume_size, const int infd,
                const Lzma_options & encoder_options, const Pretty_print & pp,
                const struct stat * const in_statsp, const bool zero )
    {
    const unsigned long long cfile_size =
      (in_statsp && S_ISREG( in_statsp->st_mode )) ? in_statsp->st_size / 100 : 0;
    int retval = 0;
    LZ_encoder_base * encoder = 0;		// polymorphic encoder
    if( verbosity >= 1 ) pp();
  
    try {
      if( zero )
        encoder = new FLZ_encoder( infd, outfd );
      else
        {
        File_header header;
        if( header.dictionary_size( encoder_options.dictionary_size ) &&
            encoder_options.match_len_limit >= min_match_len_limit &&
            encoder_options.match_len_limit <= max_match_len )
          encoder = new LZ_encoder( header.dictionary_size(),
                                    encoder_options.match_len_limit, infd, outfd );
        else internal_error( "invalid argument to encoder." );
        }
  
      unsigned long long in_size = 0, out_size = 0, partial_volume_size = 0;
      while( true )		// encode one member per iteration
        {
        const unsigned long long size = ( volume_size > 0 ) ?
          std::min( member_size, volume_size - partial_volume_size ) : member_size;
        show_progress( in_size, encoder, &pp, cfile_size );	// init
        if( !encoder->encode_member( size ) )
          { pp( "Encoder error." ); retval = 1; break; }
        in_size += encoder->data_position();
        out_size += encoder->member_position();
        if( encoder->data_finished() ) break;
        if( volume_size > 0 )
          {
          partial_volume_size += encoder->member_position();
          if( partial_volume_size >= volume_size - min_dictionary_size )
            {
            partial_volume_size = 0;
            if( delete_output_on_interrupt )
              {
              close_and_set_permissions( in_statsp );
              if( !next_filename() )
                { pp( "Too many volume files." ); retval = 1; break; }
              if( !open_outstream( true, !in_statsp ) ) { retval = 1; break; }
              }
            }
          }
        encoder->reset();
        }
  
      if( retval == 0 && verbosity >= 1 )
        {
        if( in_size == 0 || out_size == 0 )
          std::fputs( " no data compressed.\n", stderr );
        else
          std::fprintf( stderr, "%6.3f:1, %6.3f bits/byte, "
                                "%5.2f%% saved, %llu in, %llu out.\n",
                        (double)in_size / out_size,
                        ( 8.0 * out_size ) / in_size,
                        100.0 * ( 1.0 - ( (double)out_size / in_size ) ),
                        in_size, out_size );
        }
      }
    catch( std::bad_alloc )
      {
      pp( "Not enough memory. Try a smaller dictionary size." );
      retval = 1;
      }
    catch( Error e ) { pp(); show_error( e.msg, errno ); retval = 1; }
    delete encoder;
    return retval;
    }
  
  
  unsigned char xdigit( const unsigned 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 bool ignore_trailing )
    {
    if( verbosity >= 4 || !ignore_trailing )
      {
      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 ) show_file_error( pp.name(), trailing_msg );
      }
    return ignore_trailing;
    }
  
  
  int decompress( const int infd, const Pretty_print & pp,
                  const bool ignore_trailing, const bool testing )
    {
    int retval = 0;
  
    try {
      unsigned long long partial_file_pos = 0;
      Range_decoder rdec( infd );
      for( bool first_member = true; ; first_member = false )
        {
        File_header header;
        rdec.reset_member_position();
        const int size = rdec.read_data( header.data, File_header::size );
        if( rdec.finished() )			// End Of File
          {
          if( first_member || header.verify_prefix( size ) )
            { pp( "File ends unexpectedly at member header." ); retval = 2; }
          else if( size > 0 && !show_trailing_data( header.data, size, pp,
                                                    true, ignore_trailing ) )
            retval = 2;
          break;
          }
        if( !header.verify_magic() )
          {
          if( first_member )
            { show_file_error( pp.name(), bad_magic_msg ); retval = 2; }
          else if( !show_trailing_data( header.data, size, pp, false, ignore_trailing ) )
            retval = 2;
          break;
          }
        if( !header.verify_version() )
          { pp( bad_version( header.version() ) ); retval = 2; break; }
        const unsigned dictionary_size = header.dictionary_size();
        if( !isvalid_ds( dictionary_size ) )
          { pp( bad_dict_msg ); retval = 2; break; }
  
        if( verbosity >= 2 || ( verbosity == 1 && first_member ) )
          { pp(); show_header( dictionary_size ); }
  
        LZ_decoder decoder( rdec, dictionary_size, outfd );
        const int result = decoder.decode_member( pp );
        partial_file_pos += rdec.member_position();
        if( result != 0 )
          {
          if( verbosity >= 0 && result <= 2 )
            {
            pp();
            std::fprintf( stderr, "%s at pos %llu\n", ( result == 2 ) ?
                          "File ends unexpectedly" : "Decoder error",
                          partial_file_pos );
            }
          retval = 2; break;
          }
        if( verbosity >= 2 )
          { std::fputs( testing ? "ok\n" : "done\n", stderr ); pp.reset(); }
        }
      }
    catch( std::bad_alloc ) { pp( "Not enough memory." ); retval = 1; }
    catch( Error e ) { pp(); show_error( e.msg, errno ); retval = 1; }
    if( verbosity == 1 && retval == 0 )
      std::fputs( testing ? "ok\n" : "done\n", stderr );
    return retval;
    }
  
  
  extern "C" void signal_handler( int )
    {
    show_error( "Control-C or similar caught, quitting." );
    cleanup_and_fail( 1 );
    }
  
  
  void set_signals()
    {
    std::signal( SIGHUP, signal_handler );
    std::signal( SIGINT, signal_handler );
    std::signal( SIGTERM, signal_handler );
    }
  
  } // end namespace
  
  
  void show_error( const char * const msg, const int errcode, const bool help )
    {
    if( verbosity < 0 ) return;
    if( msg && msg[0] )
      {
      std::fprintf( stderr, "%s: %s", program_name, msg );
      if( errcode > 0 ) std::fprintf( stderr, ": %s", std::strerror( errcode ) );
      std::fputc( '\n', stderr );
      }
    if( help )
      std::fprintf( stderr, "Try '%s --help' for more information.\n",
                    invocation_name );
    }
  
  
  void show_file_error( const char * const filename, const char * const msg,
                        const int errcode )
    {
    if( verbosity < 0 ) return;
    std::fprintf( stderr, "%s: %s: %s", program_name, filename, msg );
    if( errcode > 0 ) std::fprintf( stderr, ": %s", std::strerror( errcode ) );
    std::fputc( '\n', stderr );
    }
  
  
  void internal_error( const char * const msg )
    {
    if( verbosity >= 0 )
      std::fprintf( stderr, "%s: internal error: %s\n", program_name, msg );
    std::exit( 3 );
    }
  
  
  void show_progress( const unsigned long long partial_size,
                      const Matchfinder_base * const m,
                      const Pretty_print * const p,
                      const unsigned long long cfile_size )
    {
    static unsigned long long csize = 0;		// file_size / 100
    static unsigned long long psize = 0;
    static const Matchfinder_base * mb = 0;
    static const Pretty_print * pp = 0;
  
    if( verbosity < 2 ) return;
    if( m )					// initialize static vars
      { csize = cfile_size; psize = partial_size; mb = m; pp = p; }
    if( mb && pp )
      {
      const unsigned long long pos = psize + mb->data_position();
      if( csize > 0 )
        std::fprintf( stderr, "%4llu%%", pos / csize );
      std::fprintf( stderr, "  %.1f MB\r", pos / 1000000.0 );
      pp->reset(); (*pp)();			// restore cursor position
      }
    }
  
  
  int main( const int argc, const char * const argv[] )
    {
    /* Mapping from gzip/bzip2 style 1..9 compression modes
       to the corresponding LZMA compression modes. */
    const Lzma_options option_mapping[] =
      {
      { 1 << 16,  16 },		// -0 entry values not used
      { 1 << 20,   5 },		// -1
      { 3 << 19,   6 },		// -2
      { 1 << 21,   8 },		// -3
      { 3 << 20,  12 },		// -4
      { 1 << 22,  20 },		// -5
      { 1 << 23,  36 },		// -6
      { 1 << 24,  68 },		// -7
      { 3 << 23, 132 },		// -8
      { 1 << 25, 273 } };		// -9
    Lzma_options encoder_options = option_mapping[6];	// default = "-6"
    const unsigned long long max_member_size = 0x0008000000000000ULL;
    const unsigned long long max_volume_size = 0x4000000000000000ULL;
    unsigned long long member_size = max_member_size;
    unsigned long long volume_size = 0;
    std::string default_output_filename;
    std::vector< std::string > filenames;
    int infd = -1;
    Mode program_mode = m_compress;
    bool force = false;
    bool ignore_trailing = true;
    bool keep_input_files = false;
    bool recompress = false;
    bool to_stdout = false;
    bool zero = false;
    invocation_name = argv[0];
  
    const Arg_parser::Option options[] =
      {
      { '0', "fast",            Arg_parser::no  },
      { '1',  0,                Arg_parser::no  },
      { '2',  0,                Arg_parser::no  },
      { '3',  0,                Arg_parser::no  },
      { '4',  0,                Arg_parser::no  },
      { '5',  0,                Arg_parser::no  },
      { '6',  0,                Arg_parser::no  },
      { '7',  0,                Arg_parser::no  },
      { '8',  0,                Arg_parser::no  },
      { '9', "best",            Arg_parser::no  },
      { 'a', "trailing-error",  Arg_parser::no  },
      { 'b', "member-size",     Arg_parser::yes },
      { 'c', "stdout",          Arg_parser::no  },
      { 'd', "decompress",      Arg_parser::no  },
      { 'f', "force",           Arg_parser::no  },
      { 'F', "recompress",      Arg_parser::no  },
      { 'h', "help",            Arg_parser::no  },
      { 'k', "keep",            Arg_parser::no  },
      { 'l', "list",            Arg_parser::no  },
      { 'm', "match-length",    Arg_parser::yes },
      { 'n', "threads",         Arg_parser::yes },
      { 'o', "output",          Arg_parser::yes },
      { 'q', "quiet",           Arg_parser::no  },
      { 's', "dictionary-size", Arg_parser::yes },
      { 'S', "volume-size",     Arg_parser::yes },
      { 't', "test",            Arg_parser::no  },
      { 'v', "verbose",         Arg_parser::no  },
      { 'V', "version",         Arg_parser::no  },
      {  0 , 0,                 Arg_parser::no  } };
  
    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 std::string & sarg = parser.argument( argind );
      const char * const arg = sarg.c_str();
      switch( code )
        {
        case '0': case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
                  zero = ( code == '0' );
                  encoder_options = option_mapping[code-'0']; break;
        case 'a': ignore_trailing = false; break;
        case 'b': member_size = getnum( arg, 100000, max_member_size ); break;
        case 'c': to_stdout = true; break;
        case 'd': set_mode( program_mode, m_decompress ); break;
        case 'f': force = true; break;
        case 'F': recompress = true; break;
        case 'h': show_help(); return 0;
        case 'k': keep_input_files = true; break;
        case 'l': set_mode( program_mode, m_list ); break;
        case 'm': encoder_options.match_len_limit =
                    getnum( arg, min_match_len_limit, max_match_len );
                  zero = false; break;
        case 'n': break;
        case 'o': default_output_filename = sarg; break;
        case 'q': verbosity = -1; break;
        case 's': encoder_options.dictionary_size = get_dict_size( arg );
                  zero = false; break;
        case 'S': volume_size = getnum( arg, 100000, max_volume_size ); 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 defined(__MSVCRT__) || defined(__OS2__)
    setmode( STDIN_FILENO, O_BINARY );
    setmode( STDOUT_FILENO, O_BINARY );
  #endif
  
    bool filenames_given = false;
    for( ; argind < parser.arguments(); ++argind )
      {
      filenames.push_back( parser.argument( argind ) );
      if( filenames.back() != "-" ) filenames_given = true;
      }
    if( filenames.empty() ) filenames.push_back("-");
  
    if( program_mode == m_list )
      return list_files( filenames, ignore_trailing );
  
    if( program_mode == m_test )
      outfd = -1;
    else if( program_mode == m_compress )
      {
      dis_slots.init();
      prob_prices.init();
      }
  
    if( !to_stdout && program_mode != m_test &&
        ( filenames_given || default_output_filename.size() ) )
      set_signals();
  
    Pretty_print pp( filenames, verbosity );
  
    int retval = 0;
    bool stdin_used = false;
    for( unsigned i = 0; i < filenames.size(); ++i )
      {
      std::string input_filename;
      struct stat in_stats;
      output_filename.clear();
  
      if( filenames[i].empty() || filenames[i] == "-" )
        {
        if( stdin_used ) continue; else stdin_used = true;
        infd = STDIN_FILENO;
        if( program_mode != m_test )
          {
          if( to_stdout || default_output_filename.empty() )
            outfd = STDOUT_FILENO;
          else
            {
            if( program_mode == m_compress )
              set_c_outname( default_output_filename, volume_size > 0 );
            else output_filename = default_output_filename;
            if( !open_outstream( force, true ) )
              {
              if( retval < 1 ) retval = 1;
              close( infd ); infd = -1;
              continue;
              }
            }
          }
        }
      else
        {
        const int eindex = extension_index( input_filename = filenames[i] );
        infd = open_instream2( input_filename.c_str(), &in_stats, program_mode,
                               eindex, recompress, to_stdout );
        if( infd < 0 ) { if( retval < 1 ) retval = 1; continue; }
        if( program_mode != m_test )
          {
          if( to_stdout ) outfd = STDOUT_FILENO;
          else
            {
            if( program_mode == m_compress )
              set_c_outname( input_filename, volume_size > 0 );
            else set_d_outname( input_filename, eindex );
            if( !open_outstream( force, false ) )
              {
              if( retval < 1 ) retval = 1;
              close( infd ); infd = -1;
              continue;
              }
            }
          }
        }
  
      pp.set_name( input_filename );
      if( !check_tty( pp.name(), infd, program_mode ) )
        {
        if( retval < 1 ) retval = 1;
        if( program_mode == m_test ) { close( infd ); infd = -1; continue; }
        cleanup_and_fail( retval );
        }
  
      const struct stat * const in_statsp = input_filename.size() ? &in_stats : 0;
      int tmp;
      if( program_mode == m_compress )
        tmp = compress( member_size, volume_size, infd, encoder_options, pp,
                        in_statsp, zero );
      else
        tmp = decompress( infd, pp, ignore_trailing, 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;
    }
  