summaryrefslogtreecommitdiffstats
path: root/main.cc
blob: 8b2eeddecfe525d405923bf6a26ede7d0465ac2e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
/*  Lzip - LZMA lossless data compressor
    Copyright (C) 2008-2016 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 = "2016";
const char * invocation_name = 0;

struct { const char * from; const char * to; } const 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_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"
               "  -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" );
  }


void show_header( const unsigned dictionary_size )
  {
  if( verbosity >= 3 )
    {
    const char * const prefix[8] =
      { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
    enum { factor = 1024 };
    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 = ""; }
    std::fprintf( stderr, "dictionary size %s%4u %sB.  ", np, num, p );
    }
  }


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 int 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 int 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 );
  }


int extension_index( const std::string & name )
  {
  for( int i = 0; known_extensions[i].from; ++i )
    {
    const std::string ext( known_extensions[i].from );
    if( name.size() > ext.size() &&
        name.compare( name.size() - ext.size(), ext.size(), ext ) == 0 )
      return i;
    }
  return -1;
  }


int open_instream( const char * const name, struct stat * const in_statsp,
                   const Mode program_mode, const int eindex,
                   const bool recompress, const bool to_stdout )
  {
  int infd = -1;
  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 );
    }
  else
    {
    infd = open( name, 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, 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 &&
                              ( S_ISBLK( mode ) || S_ISCHR( mode ) ||
                                S_ISFIFO( mode ) || S_ISSOCK( mode ) ) );
      const bool no_ofile = ( to_stdout || program_mode == m_test );
      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;
  }


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 i )
  {
  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, 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 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_error( "I won't read compressed data from a terminal.", 0, true );
    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 ext_len = std::strlen( known_extensions[0].from );
  if( output_filename.size() >= ext_len + 5 )		// "*00001.lz"
    for( int i = output_filename.size() - 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 int value )
  {
  if( value >= 0 && value <= 9 ) return '0' + value;
  if( value >= 10 && 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 = ";
    bool text = true;
    for( int i = 0; i < size; ++i )
      if( !std::isprint( data[i] ) ) { text = false; break; }
    if( text )
      {
      msg += '\'';
      msg.append( (const char *)data, size );
      msg += '\'';
      }
    else
      {
      for( int i = 0; i < size; ++i )
        {
        if( i > 0 ) msg += ' ';
        msg += xdigit( data[i] >> 4 );
        msg += xdigit( data[i] & 0x0F );
        }
      }
    pp( msg.c_str() );
    if( !ignore_trailing ) show_error( "Trailing data not allowed." );
    }
  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 )
          { pp( "Bad magic number (file not in lzip format)." ); retval = 2; }
        else if( !show_trailing_data( header.data, size, pp, false, ignore_trailing ) )
          retval = 2;
        break;
        }
      if( !header.verify_version() )
        {
        if( verbosity >= 0 )
          { pp();
            std::fprintf( stderr, "Version %d member format not supported.\n",
                          header.version() ); }
        retval = 2; break;
        }
      const unsigned dictionary_size = header.dictionary_size();
      if( !isvalid_ds( dictionary_size ) )
        { pp( "Invalid dictionary size in member header." ); 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 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 input_filename;
  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  },
    { '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 & arg = parser.argument( argind );
    const char * const ptr = arg.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( ptr, 100000, max_member_size ); break;
      case 'c': to_stdout = true; break;
      case 'd': 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 'm': encoder_options.match_len_limit =
                  getnum( ptr, min_match_len_limit, max_match_len );
                zero = false; break;
      case 'n': break;
      case 'o': default_output_filename = arg; break;
      case 'q': verbosity = -1; break;
      case 's': encoder_options.dictionary_size = get_dict_size( ptr );
                zero = false; break;
      case 'S': volume_size = getnum( ptr, 100000, max_volume_size ); break;
      case 't': program_mode = m_test; break;
      case 'v': if( verbosity < 4 ) ++verbosity; break;
      case 'V': show_version(); return 0;
      default : internal_error( "uncaught option." );
      }
    } // end process options

#if defined(__MSVCRT__) || defined(__OS2__)
  setmode( STDIN_FILENO, O_BINARY );
  setmode( STDOUT_FILENO, O_BINARY );
#endif

  if( program_mode == m_test )
    outfd = -1;
  else if( program_mode == m_compress )
    {
    dis_slots.init();
    prob_prices.init();
    }

  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( !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 )
    {
    struct stat in_stats;
    output_filename.clear();

    if( filenames[i].empty() || filenames[i] == "-" )
      {
      if( stdin_used ) continue; else stdin_used = true;
      input_filename.clear();
      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
      {
      input_filename = filenames[i];
      const int eindex = extension_index( input_filename );
      infd = open_instream( 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;
            }
          }
        }
      }

    if( !check_tty( infd, program_mode ) )
      {
      if( retval < 1 ) retval = 1;
      cleanup_and_fail( retval );
      }

    const struct stat * const in_statsp = input_filename.size() ? &in_stats : 0;
    pp.set_name( input_filename );
    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;
  }