summaryrefslogtreecommitdiffstats
path: root/main.c
blob: cda432703d84ea9c547e01d88024cff947510f78 (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
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
/*  Pdlzip - Data compressor based on the LZMA algorithm
    2009-08-14 : Igor Pavlov : Public domain
    Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.

    This program is free software: you have unlimited permission
    to copy, distribute and modify it.

    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.
*/
/*
    Return values: 0 for a normal exit, 1 for environmental problems
    (file not found, invalid flags, I/O errors, etc), 2 to indicate a
    corrupt or invalid input file, 3 for an internal consistency error
    (eg, bug) which caused pdlzip to panic.
*/

#define _FILE_OFFSET_BITS 64

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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 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 "carg_parser.h"
#include "clzip.h"
#include "LzmaDec.h"
#include "LzmaEnc.h"

#if CHAR_BIT != 8
#error "Environments where CHAR_BIT != 8 are not supported."
#endif


const char * const Program_name = "Pdlzip";
const char * const program_name = "pdlzip";
const char * const program_year = "2013";
const char * invocation_name = 0;

#ifdef O_BINARY
const int o_binary = O_BINARY;
#else
const int o_binary = 0;
#endif

struct { const char * from; const char * to; } const known_extensions[] = {
  { ".lz",   ""     },
  { ".tlz",  ".tar" },
  { ".lzma", ""     },
  { 0,       0      } };

struct Lzma_options
  {
  int dictionary_size;		/* 4KiB..512MiB */
  int match_len_limit;		/* 5..273 */
  };

enum Mode { m_compress, m_decompress, m_test };

char * output_filename = 0;
int outfd = -1;
int verbosity = 0;
const mode_t usr_rw = S_IRUSR | S_IWUSR;
const mode_t all_rw = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
mode_t outfd_mode = S_IRUSR | S_IWUSR;
bool delete_output_on_interrupt = false;


static void show_help( void )
  {
  printf( "%s - A \"public domain\" version of the lzip data compressor\n", Program_name );
  printf( "also able to decompress legacy lzma-alone (.lzma) files.\n"
          "\nUsage: %s [options] [files]\n", invocation_name );
  printf( "\nOptions:\n"
          "  -h, --help                     display this help and exit\n"
          "  -V, --version                  output version information and exit\n"
          "  -c, --stdout                   send output to standard output\n"
          "  -d, --decompress               decompress\n"
          "  -f, --force                    overwrite existing output files\n"
          "  -F, --recompress               force recompression 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 stdin, place the output into <file>\n"
          "  -q, --quiet                    suppress all messages\n"
          "  -s, --dictionary-size=<bytes>  set dictionary size limit in bytes [8MiB]\n"
          "  -t, --test                     test compressed file integrity\n"
          "  -v, --verbose                  be verbose (a 2nd -v gives more)\n"
          "  -1 .. -9                       set compression level [default 6]\n"
          "      --fast                     alias for -1\n"
          "      --best                     alias for -9\n"
          "If no file names are given, pdlzip compresses or 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"
          "The 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 --match-length and --dictionary-size\n"
          "options directly to achieve optimal performance.\n"
          "\nReport bugs to lzip-bug@nongnu.org\n"
          "Pdlzip home page: http://www.nongnu.org/lzip/pdlzip.html\n" );
  }


static void show_version( void )
  {
  printf( "%s %s\n", Program_name, PROGVERSION );
  printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
  printf( "Public Domain 2009 Igor Pavlov.\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" );
  }


static const char * format_num( unsigned num )
  {
  const char * const prefix[8] =
    { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
  enum { buf_size = 16, factor = 1024 };
  static char buf[buf_size];
  const char * p = "";
  bool exact = ( num % factor == 0 );
  int i;

  for( i = 0; i < 8 && ( num > 9999 || ( exact && num >= factor ) ); ++i )
    { num /= factor; if( num % factor != 0 ) exact = false; p = prefix[i]; }
  snprintf( buf, buf_size, "%u %s", num, p );
  return buf;
  }


void show_header( const File_header header )
  {
  const char * const prefix[8] =
    { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
  enum { factor = 1024 };
  const char * p = "";
  const char * np = "  ";
  unsigned num = Fh_get_dictionary_size( header ), i;
  bool exact = ( num % factor == 0 );

  for( i = 0; i < 8 && ( num > 9999 || ( exact && num >= factor ) ); ++i )
    { num /= factor; if( num % factor != 0 ) exact = false;
      p = prefix[i]; np = ""; }
  fprintf( stderr, "version %d, dictionary size %s%4u %sB.  ",
           Fh_version( header ), np, num, p );
  }


static unsigned long getnum( const char * const ptr,
                             const unsigned long llimit,
                             const unsigned long ulimit )
  {
  unsigned long result;
  char * tail;
  errno = 0;
  result = strtoul( ptr, &tail, 0 );
  if( tail == ptr )
    {
    show_error( "Bad or missing numerical argument.", 0, true );
    exit( 1 );
    }

  if( !errno && tail[0] )
    {
    int factor = ( tail[1] == 'i' ) ? 1024 : 1000;
    int exponent = 0, i;
    bool bad_multiplier = false;
    switch( tail[0] )
      {
      case ' ': break;
      case 'Y': exponent = 8; break;
      case 'Z': exponent = 7; break;
      case 'E': exponent = 6; break;
      case 'P': exponent = 5; break;
      case 'T': exponent = 4; break;
      case 'G': exponent = 3; break;
      case 'M': exponent = 2; break;
      case 'K': if( factor == 1024 ) exponent = 1; else bad_multiplier = true;
                break;
      case 'k': if( factor == 1000 ) exponent = 1; else bad_multiplier = true;
                break;
      default : bad_multiplier = true;
      }
    if( bad_multiplier )
      {
      show_error( "Bad multiplier in numerical argument.", 0, true );
      exit( 1 );
      }
    for( 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.", 0, false );
    exit( 1 );
    }
  return result;
  }


static int get_dict_size( const char * const arg )
  {
  char * tail;
  int bits = 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 );
  }


static int extension_index( const char * const name )
  {
  int i;
  for( i = 0; known_extensions[i].from; ++i )
    {
    const char * const ext = known_extensions[i].from;
    if( strlen( name ) > strlen( ext ) &&
        strncmp( name + strlen( name ) - strlen( ext ), ext, strlen( ext ) ) == 0 )
      return i;
    }
  return -1;
  }


static int open_instream( const char * const name, struct stat * const in_statsp,
                          const enum 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 )
      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 )
        fprintf( stderr, "%s: Can't open input file '%s': %s.\n",
                 program_name, name, 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 ) ) );
      if( i != 0 || ( !S_ISREG( mode ) && ( !to_stdout || !can_read ) ) )
        {
        if( verbosity >= 0 )
          fprintf( stderr, "%s: Input file '%s' is not a regular file%s.\n",
                   program_name, name,
                   ( can_read && !to_stdout ) ?
                   " and '--stdout' was not specified" : "" );
        close( infd );
        infd = -1;
        }
      }
    }
  return infd;
  }


void cleanup_and_fail( const int retval )
  {
  if( delete_output_on_interrupt )
    {
    delete_output_on_interrupt = false;
    if( verbosity >= 0 )
      fprintf( stderr, "%s: Deleting output file '%s', if it exists.\n",
               program_name, output_filename );
    if( outfd >= 0 ) { close( outfd ); outfd = -1; }
    if( remove( output_filename ) != 0 && errno != ENOENT )
      show_error( "WARNING: deletion of output file (apparently) failed.", 0, false );
    }
  exit( retval );
  }


/* assure at least a minimum size for buffer 'buf' */
static void * resize_buffer( void * buf, const int min_size )
  {
  if( buf ) buf = realloc( buf, min_size );
  else buf = malloc( min_size );
  if( !buf )
    {
    show_error( "Not enough memory.", 0, false );
    cleanup_and_fail( 1 );
    }
  return buf;
  }


static void set_c_outname( const char * const name )
  {
  output_filename = resize_buffer( output_filename, strlen( name ) +
                                   strlen( known_extensions[0].from ) + 1 );
  strcpy( output_filename, name );
  strcat( output_filename, known_extensions[0].from );
  }


static void set_d_outname( const char * const name, const int i )
  {
  if( i >= 0 )
    {
    const char * const from = known_extensions[i].from;
    if( strlen( name ) > strlen( from ) )
      {
      output_filename = resize_buffer( output_filename, strlen( name ) +
                                       strlen( known_extensions[0].to ) + 1 );
      strcpy( output_filename, name );
      strcpy( output_filename + strlen( name ) - strlen( from ),
              known_extensions[i].to );
      return;
      }
    }
  output_filename = resize_buffer( output_filename, strlen( name ) + 4 + 1 );
  strcpy( output_filename, name );
  strcat( output_filename, ".out" );
  if( verbosity >= 1 )
    fprintf( stderr, "%s: Can't guess original name for '%s' -- using '%s'.\n",
             program_name, name, output_filename );
  }


static bool open_outstream( const bool force )
  {
  int flags = O_CREAT | O_WRONLY | o_binary;
  if( force ) flags |= O_TRUNC; else flags |= O_EXCL;

  outfd = open( output_filename, flags, outfd_mode );
  if( outfd < 0 && verbosity >= 0 )
    {
    if( errno == EEXIST )
      fprintf( stderr, "%s: Output file '%s' already exists, skipping.\n",
               program_name, output_filename );
    else
      fprintf( stderr, "%s: Can't create output file '%s': %s.\n",
               program_name, output_filename, strerror( errno ) );
    }
  return ( outfd >= 0 );
  }


static bool check_tty( const int infd, const enum Mode program_mode )
  {
  if( program_mode == m_compress && outfd >= 0 && 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;
  }


     /* Set permissions, owner and times. */
static void close_and_set_permissions( const struct stat * const in_statsp )
  {
  bool warning = false;
  if( in_statsp )
    {
    /* fchown will in many cases return with EPERM, which can be safely ignored. */
    if( ( fchown( outfd, in_statsp->st_uid, in_statsp->st_gid ) != 0 &&
          errno != EPERM ) ||
        fchmod( outfd, in_statsp->st_mode ) != 0 ) warning = true;
    }
  if( close( outfd ) != 0 ) cleanup_and_fail( 1 );
  outfd = -1;
  delete_output_on_interrupt = false;
  if( in_statsp )
    {
    struct utimbuf t;
    t.actime = in_statsp->st_atime;
    t.modtime = in_statsp->st_mtime;
    if( utime( output_filename, &t ) != 0 ) warning = true;
    }
  if( warning && verbosity >= 1 )
    show_error( "Can't change output file attributes.", 0, false );
  }


static int compress( const struct Lzma_options * const encoder_options,
                     const int infd, struct Pretty_print * const pp )
  {
  int retval = 0;
  File_header header;
  CLzmaEncHandle encoder;

  if( verbosity >= 1 ) Pp_show_msg( pp, 0 );
  Fh_set_magic( header );
  if( !Fh_set_dictionary_size( header, encoder_options->dictionary_size ) ||
      encoder_options->match_len_limit < min_match_len_limit ||
      encoder_options->match_len_limit > max_match_len )
    internal_error( "invalid argument to encoder" );

  encoder = LzmaEnc_Init( Fh_get_dictionary_size( header ),
                          encoder_options->match_len_limit, infd, outfd );
  if( !encoder )
    {
    Pp_show_msg( pp, "Not enough memory. Try a smaller dictionary size" );
    return 1;
    }

  if( writeblock( outfd, header, Fh_size ) != Fh_size )
    { show_error( "Can not write output file", errno, false ); retval = 1; }
  else
    if( LzmaEnc_Encode( encoder ) != 0 )
      { Pp_show_msg( pp, "Encoder error" ); retval = 1; }
  LzmaEnc_Free( encoder );
  return retval;
  }


#define IN_BUF_SIZE (1 << 16)
#define OUT_BUF_SIZE (1 << 16)

static bool read_inbuf( const int infd, uint8_t inBuf[],
                        int * const inPos, int * const inSize )
  {
  int rest;
  if( *inPos >= *inSize ) *inSize = 0;
  else if( *inPos > 0 )
    {
    memmove( inBuf, inBuf + *inPos, *inSize - *inPos );
    *inSize -= *inPos;
    }
  *inPos = 0;
  rest = IN_BUF_SIZE - *inSize;
  if( rest > 0 )
    {
    const int rd = readblock( infd, inBuf + *inSize, rest );
    if( rd < rest && errno )
      { show_error( "Read error", errno, false ); return false; }
    *inSize += rd;
    }
  return true;
  }


static int lzma_decode( uint64_t unpackSize, CLzmaDec *decoder, const int infd,
                        uint8_t inBuf[], int * const inPos,
                        int * const inSize, const bool testing )
  {
  unsigned long long total_in = 13, total_out = 0;
  uint8_t outBuf[OUT_BUF_SIZE];
  int outPos = 0;
  const bool thereIsSize = (unpackSize != (uint64_t)-1);

  for (;;)
    {
    uint32_t inProcessed;
    uint32_t outProcessed = OUT_BUF_SIZE - outPos;
    ELzmaFinishMode finishMode = LZMA_FINISH_ANY;
    ELzmaStatus status;

    if( *inPos >= *inSize && !read_inbuf( infd, inBuf, inPos, inSize ) )
      return 1;
    inProcessed = *inSize - *inPos;
    if (thereIsSize && outProcessed > unpackSize)
      {
      outProcessed = unpackSize;
      finishMode = LZMA_FINISH_END;
      }

    if( !LzmaDec_DecodeToBuf( decoder, outBuf + outPos, &outProcessed,
        inBuf + *inPos, &inProcessed, finishMode, &status ) )
      { show_error( "Data error.", 0, false ); return 1; }
    *inPos += inProcessed;
    total_in += inProcessed;
    outPos += outProcessed;
    unpackSize -= outProcessed;

    if( outfd >= 0 && writeblock( outfd, outBuf, outPos ) != outPos )
      { show_error( "Can not write output file", errno, false ); return 1; }

    total_out += outPos;
    outPos = 0;

    if( ( inProcessed == 0 && outProcessed == 0 ) ||
        ( thereIsSize && unpackSize == 0 ) )
      {
      if( ( thereIsSize && unpackSize != 0 ) ||
          ( !thereIsSize && status != LZMA_STATUS_FINISHED_WITH_MARK ) )
        { show_error( "Data error.", 0, false ); return 1; }
      if( verbosity >= 2 )
        fprintf( stderr, "lzma-alone, dictionary size %7sB.  ",
                 format_num( decoder->dicBufSize ) );
      if( verbosity >= 3 )
        fprintf( stderr, "uncompressed size %9llu, compressed size %8llu.  ",
                 total_out, total_in );
      if( verbosity >= 1 )
        { if( testing ) fprintf( stderr, "(apparently) ok\n" );
          else fprintf( stderr, "(apparently) done\n" ); }
      return 0;
      }
    }
  }


static int lzip_decode( CLzmaDec *decoder, const int infd, uint8_t inBuf[],
                        int * const inPos, int * const inSize,
                        const int member_version )
  {
  unsigned long long total_in = Fh_size, total_out = 0;
  uint8_t outBuf[OUT_BUF_SIZE];
  int outPos = 0;
  uint32_t crc = 0xFFFFFFFFU;

  for (;;)
    {
    uint32_t inProcessed;
    uint32_t outProcessed = OUT_BUF_SIZE - outPos;
    ELzmaFinishMode finishMode = LZMA_FINISH_ANY;
    ELzmaStatus status;

    if( *inPos >= *inSize && !read_inbuf( infd, inBuf, inPos, inSize ) )
      return 1;
    if( *inPos >= *inSize )
      { show_error( "Unexpected EOF.", 0, false ); return 1; }
    inProcessed = *inSize - *inPos;

    if( !LzmaDec_DecodeToBuf( decoder, outBuf + outPos, &outProcessed,
        inBuf + *inPos, &inProcessed, finishMode, &status ) )
      { show_error( "Data error.", 0, false ); return 1; }
    *inPos += inProcessed;
    total_in += inProcessed;
    outPos += outProcessed;

    if( outfd >= 0 && writeblock( outfd, outBuf, outPos ) != outPos )
      { show_error( "Can not write output file", errno, false ); return 1; }

    CRC32_update_buf( &crc, outBuf, outPos );
    total_out += outPos;
    outPos = 0;

    if (inProcessed == 0 && outProcessed == 0)
      {
      File_trailer trailer;
      int i;
      const int trailer_size = Ft_versioned_size( member_version );
      bool error = false;

      if( status != LZMA_STATUS_FINISHED_WITH_MARK )
        { show_error( "Data error.", 0, false ); return 1; }
      if( *inSize - *inPos < trailer_size &&
          !read_inbuf( infd, inBuf, inPos, inSize ) ) return 1;
      if( *inSize - *inPos < trailer_size )
        {
        error = true;
        if( verbosity >= 0 )
          fprintf( stderr, "Trailer truncated at trailer position %u;"
                           " some checks may fail.\n",
                           (unsigned)(*inSize - *inPos) );
        for( i = *inSize - *inPos; i < trailer_size; ++i )
          inBuf[*inPos+i] = 0;
        }
      for( i = 0; i < trailer_size; ++i )
        trailer[i] = inBuf[(*inPos)++];
      total_in += trailer_size;
      if( member_version == 0 ) Ft_set_member_size( trailer, total_in );
      if( Ft_get_data_crc( trailer ) != ( crc ^ 0xFFFFFFFFU ) )
        {
        error = true;
        if( verbosity >= 0 )
          fprintf( stderr, "CRC mismatch; trailer says %08X, data crc is %08X.\n",
                   Ft_get_data_crc( trailer ), crc ^ 0xFFFFFFFFU );
        }
      if( Ft_get_data_size( trailer ) != total_out )
        {
        error = true;
        if( verbosity >= 0 )
          fprintf( stderr, "Data size mismatch; trailer says %llu, data size is %llu (0x%llX).\n",
                   Ft_get_data_size( trailer ), total_out, total_out );
        }
      if( Ft_get_member_size( trailer ) != total_in )
        {
        error = true;
        if( verbosity >= 0 )
          fprintf( stderr, "Member size mismatch; trailer says %llu, member size is %llu (0x%llX).\n",
                   Ft_get_member_size( trailer ), total_in, total_in );
        }
      if( !error && verbosity >= 3 && total_out > 0 && total_in > 0 )
        fprintf( stderr, "%6.3f:1, %6.3f bits/byte, %5.2f%% saved.  ",
                 (double)total_out / total_in,
                 ( 8.0 * total_in ) / total_out,
                 100.0 * ( 1.0 - ( (double)total_in / total_out ) ) );
      if( !error && verbosity >= 4 )
        fprintf( stderr, "data CRC %08X, data size %9llu, member size %8llu.  ",
                 Ft_get_data_crc( trailer ),
                 Ft_get_data_size( trailer ), Ft_get_member_size( trailer ) );
      if( error ) return 2;
      return 0;
      }
    }
  }


static int decompress( const int infd, struct Pretty_print * const pp,
                       const bool testing )
  {
  uint64_t unpackSize = 0;
  CLzmaDec decoder;
  uint8_t inBuf[IN_BUF_SIZE];
  int inPos = 0, inSize = 0;
  int retval = 0;
  bool lzip_mode = true;
  bool first_member;
  /* 5 bytes of LZMA properties and 8 bytes of uncompressed size */
  uint8_t raw_props[LZMA_PROPS_SIZE+8];

  for( first_member = true; ; first_member = false )
    {
    int i;
    File_header header;
    if( inSize - inPos < Fh_size &&
        !read_inbuf( infd, inBuf, &inPos, &inSize ) ) return 1;
    if( inSize - inPos < Fh_size )		/* End Of File */
      {
      if( first_member )
        { Pp_show_msg( pp, "Error reading member header" ); retval = 1; }
      break;
      }
    for( i = 0; i < Fh_size; ++i ) raw_props[i] = header[i] = inBuf[inPos++];
    if( !Fh_verify_magic( header ) )
      {
      if( !first_member ) break;		/* trailing garbage */
      if( inSize - inPos >= 13 - Fh_size )	/* try lzma-alone */
        {
        for( i = Fh_size; i < 13; ++i ) raw_props[i] = inBuf[inPos++];
        for( i = 0; i < 8; ++i )
          unpackSize += (uint64_t)raw_props[LZMA_PROPS_SIZE+i] << (i * 8);
        if( ( raw_props[12] == 0 || raw_props[12] == 0xFF ) &&
            raw_props[12] == raw_props[11] && raw_props[0] < (9 * 5 * 5) )
          lzip_mode = false;
        }
      if( lzip_mode )
        {
        Pp_show_msg( pp, "Bad magic number (file not in lzip format)" );
        retval = 2; break;
        }
      }
    if( lzip_mode )
      {
      int ds, i;
      if( !Fh_verify_version( header ) )
        {
        if( verbosity >= 0 )
          { Pp_show_msg( pp, 0 );
            fprintf( stderr, "Version %d member format not supported.\n",
                     Fh_version( header ) ); }
        retval = 2; break;
        }
      if( Fh_get_dictionary_size( header ) < min_dictionary_size ||
          Fh_get_dictionary_size( header ) > max_dictionary_size )
        { Pp_show_msg( pp, "Invalid dictionary size in member header" );
          retval = 2; break; }

      raw_props[0] = 93;		/* (45 * 2) + (9 * 0) + 3 */
      ds = Fh_get_dictionary_size( header );
      for( i = 1; i <= 4; ++i ) { raw_props[i] = ds & 0xFF; ds >>= 8; }
      }

    if( verbosity >= 2 || ( verbosity == 1 && first_member ) )
      {
      Pp_show_msg( pp, 0 );
      if( lzip_mode && verbosity >= 2 ) show_header( header );
      }

    if( !LzmaDec_Init( &decoder, raw_props ) )
      {
      show_error( "Not enough memory. Find a machine with more memory.", 0, false );
      cleanup_and_fail( 1 );
      }
    if( lzip_mode )
      retval = lzip_decode( &decoder, infd, inBuf, &inPos, &inSize,
                            Fh_version( header ) );
    else
      retval = lzma_decode( unpackSize, &decoder, infd,
                            inBuf, &inPos, &inSize, testing );
    LzmaDec_Free(&decoder);
    if( retval != 0 || !lzip_mode ) break;
    if( verbosity >= 2 )
      { if( testing ) fprintf( stderr, "ok\n" );
        else fprintf( stderr, "done\n" ); Pp_reset( pp ); }
    }
  if( lzip_mode && verbosity == 1 && retval == 0 )
    { if( testing ) fprintf( stderr, "ok\n" );
      else fprintf( stderr, "done\n" ); }
  return retval;
  }


void signal_handler( int sig )
  {
  if( sig ) {}				/* keep compiler happy */
  show_error( "Control-C or similar caught, quitting.", 0, false );
  cleanup_and_fail( 1 );
  }


static void set_signals( void )
  {
  signal( SIGHUP, signal_handler );
  signal( SIGINT, signal_handler );
  signal( SIGTERM, signal_handler );
  }


void Pp_init( struct Pretty_print * const pp, const char * const filenames[],
              const int num_filenames, const int v )
  {
  unsigned stdin_name_len;
  int i;
  pp->name = 0;
  pp->stdin_name = "(stdin)";
  pp->longest_name = 0;
  pp->verbosity = v;
  pp->first_post = false;
  stdin_name_len = strlen( pp->stdin_name );

  for( i = 0; i < num_filenames; ++i )
    {
    const char * const s = filenames[i];
    const int len = ( (strcmp( s, "-" ) == 0) ? stdin_name_len : strlen( s ) );
    if( len > pp->longest_name ) pp->longest_name = len;
    }
  if( pp->longest_name == 0 ) pp->longest_name = stdin_name_len;
  }


void Pp_show_msg( struct Pretty_print * const pp, const char * const msg )
  {
  if( verbosity >= 0 )
    {
    if( pp->first_post )
      {
      int i, len;
      pp->first_post = false;
      fprintf( stderr, "  %s: ", pp->name );
      len = pp->longest_name - strlen( pp->name );
      for( i = 0; i < len; ++i ) fprintf( stderr, " " );
      if( !msg ) fflush( stderr );
      }
    if( msg ) fprintf( stderr, "%s.\n", msg );
    }
  }


void show_error( const char * const msg, const int errcode, const bool help )
  {
  if( verbosity >= 0 )
    {
    if( msg && msg[0] )
      {
      fprintf( stderr, "%s: %s", program_name, msg );
      if( errcode > 0 ) fprintf( stderr, ": %s", strerror( errcode ) );
      fprintf( stderr, "\n" );
      }
    if( help )
      fprintf( stderr, "Try '%s --help' for more information.\n",
               invocation_name );
    }
  }


void internal_error( const char * const msg )
  {
  if( verbosity >= 0 )
    fprintf( stderr, "%s: internal error: %s.\n", program_name, msg );
  exit( 3 );
  }


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 struct Lzma_options option_mapping[] =
    {
    { 1 << 20,   5 },		/* -0 */
    { 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 */
  struct Lzma_options encoder_options = option_mapping[6];  /* default = "-6" */
  const char * input_filename = "";
  const char * default_output_filename = "";
  const char ** filenames = 0;
  int num_filenames = 0;
  int infd = -1;
  enum Mode program_mode = m_compress;
  int argind = 0;
  int retval = 0;
  int i;
  bool filenames_given = false;
  bool force = false;
  bool keep_input_files = false;
  bool recompress = false;
  bool to_stdout = false;
  struct Pretty_print pp;

  const struct ap_Option options[] =
    {
    { '0', "fast",            ap_no  },
    { '1',  0,                ap_no  },
    { '2',  0,                ap_no  },
    { '3',  0,                ap_no  },
    { '4',  0,                ap_no  },
    { '5',  0,                ap_no  },
    { '6',  0,                ap_no  },
    { '7',  0,                ap_no  },
    { '8',  0,                ap_no  },
    { '9', "best",            ap_no  },
    { 'b', "member-size",     ap_yes },
    { 'c', "stdout",          ap_no  },
    { 'd', "decompress",      ap_no  },
    { 'f', "force",           ap_no  },
    { 'F', "recompress",      ap_no  },
    { 'h', "help",            ap_no  },
    { 'k', "keep",            ap_no  },
    { 'm', "match-length",    ap_yes },
    { 'o', "output",          ap_yes },
    { 'q', "quiet",           ap_no  },
    { 's', "dictionary-size", ap_yes },
    { 'S', "volume-size",     ap_yes },
    { 't', "test",            ap_no  },
    { 'v', "verbose",         ap_no  },
    { 'V', "version",         ap_no  },
    {  0 ,  0,                ap_no  } };

  struct Arg_parser parser;

  invocation_name = argv[0];
  CRC32_init();

  if( !ap_init( &parser, argc, argv, options, 0 ) )
    { show_error( "Memory exhausted.", 0, false ); return 1; }
  if( ap_error( &parser ) )				/* bad option */
    { show_error( ap_error( &parser ), 0, true ); return 1; }

  for( ; argind < ap_arguments( &parser ); ++argind )
    {
    const int code = ap_code( &parser, argind );
    const char * const arg = ap_argument( &parser, argind );
    if( !code ) break;					/* no more options */
    switch( code )
      {
      case '0':
      case '1': case '2': case '3': case '4':
      case '5': case '6': case '7': case '8': case '9':
                encoder_options = option_mapping[code-'0']; break;
      case 'b': 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( arg, min_match_len_limit, max_match_len ); break;
      case 'o': default_output_filename = arg; break;
      case 'q': verbosity = -1; break;
      case 's': encoder_options.dictionary_size = get_dict_size( arg );
                break;
      case 'S': 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;

  num_filenames = max( 1, ap_arguments( &parser ) - argind );
  filenames = resize_buffer( filenames, num_filenames * sizeof filenames[0] );
  filenames[0] = "-";

  for( i = 0; argind + i < ap_arguments( &parser ); ++i )
    {
    filenames[i] = ap_argument( &parser, argind + i );
    if( strcmp( filenames[i], "-" ) != 0 ) filenames_given = true;
    }

  if( !to_stdout && program_mode != m_test &&
      ( filenames_given || default_output_filename[0] ) )
    set_signals();

  Pp_init( &pp, filenames, num_filenames, verbosity );

  output_filename = resize_buffer( output_filename, 1 );
  for( i = 0; i < num_filenames; ++i )
    {
    int tmp;
    struct stat in_stats;
    const struct stat * in_statsp;
    output_filename[0] = 0;

    if( !filenames[i][0] || strcmp( filenames[i], "-" ) == 0 )
      {
      input_filename = "";
      infd = STDIN_FILENO;
      if( program_mode != m_test )
        {
        if( to_stdout || !default_output_filename[0] )
          outfd = STDOUT_FILENO;
        else
          {
          if( program_mode == m_compress )
            set_c_outname( default_output_filename );
          else
            {
            output_filename = resize_buffer( output_filename,
                                             strlen( default_output_filename ) + 1 );
            strcpy( output_filename, default_output_filename );
            }
          outfd_mode = all_rw;
          if( !open_outstream( force ) )
            {
            if( retval < 1 ) retval = 1;
            close( infd ); infd = -1;
            continue;
            }
          }
        }
      }
    else
      {
      const int eindex = extension_index( filenames[i] );
      input_filename = filenames[i];
      infd = open_instream( input_filename, &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 );
          else set_d_outname( input_filename, eindex );
          outfd_mode = usr_rw;
          if( !open_outstream( force ) )
            {
            if( retval < 1 ) retval = 1;
            close( infd ); infd = -1;
            continue;
            }
          }
        }
      }

    if( !check_tty( infd, program_mode ) ) return 1;

    if( output_filename[0] && !to_stdout && program_mode != m_test )
      delete_output_on_interrupt = true;
    in_statsp = input_filename[0] ? &in_stats : 0;
    Pp_set_name( &pp, input_filename );
    if( program_mode == m_compress )
      tmp = compress( &encoder_options, infd, &pp );
    else
      tmp = decompress( infd, &pp, program_mode == m_test );
    if( tmp > retval ) retval = tmp;
    if( tmp && program_mode != m_test ) cleanup_and_fail( retval );

    if( delete_output_on_interrupt )
      close_and_set_permissions( in_statsp );
    if( input_filename[0] )
      {
      close( infd ); infd = -1;
      if( !keep_input_files && !to_stdout && program_mode != m_test )
        remove( input_filename );
      }
    }
  if( outfd >= 0 && close( outfd ) != 0 )
    {
    show_error( "Can't close stdout", errno, false );
    if( retval < 1 ) retval = 1;
    }
  free( output_filename );
  free( filenames );
  ap_free( &parser );
  return retval;
  }