summaryrefslogtreecommitdiffstats
path: root/main.c
blob: 1862ffddda046248721c6afb168ef6069ab89f0c (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
/*  Lunzip - Decompressor for lzip files
    Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
/*
    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 lunzip to panic.
*/

#define _FILE_OFFSET_BITS 64

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdbool.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 "lzip.h"
#include "decoder.h"

#ifndef O_BINARY
#define O_BINARY 0
#endif

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


const char * const Program_name = "Lunzip";
const char * const program_name = "lunzip";
const char * const program_year = "2013";
const char * invocation_name = 0;

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

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( "Lunzip is a decompressor for lzip files. It is written in C and its\n"
          "small size makes it well suited for embedded devices or software\n"
          "installers that need to decompress files but do not need compression\n"
          "capabilities. Lunzip is fully compatible with lzip-1.4 or newer.\n"
          "\nIf the size of the output buffer is specified with the '--buffer-size'\n"
          "option, lunzip uses the decompressed file as dictionary for distances\n"
          "beyond the buffer size and is able to decompress any file using as\n"
          "little memory as 50 kB, irrespective of the dictionary size used to\n"
          "compress the file. Of course, the smaller the output buffer size used in\n"
          "relation to the dictionary size, the more accesses to disk are needed\n"
          "and the slower the decompression is. This 'low memory' mode only works\n"
          "when decompressing to a regular file.\n" );
  printf( "\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 (this is the default)\n"
          "  -f, --force                overwrite existing output files\n"
          "  -k, --keep                 keep (don't delete) input files\n"
          "  -o, --output=<file>        if reading stdin, place the output into <file>\n"
          "  -q, --quiet                suppress all messages\n"
          "  -t, --test                 test compressed file integrity\n"
          "  -u, --buffer-size=<bytes>  set output buffer size in bytes\n"
          "  -v, --verbose              be verbose (a 2nd -v gives more)\n"
          "If no file names are given, lunzip decompresses from standard input to\n"
          "standard output.\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 lunzip to panic.\n"
          "\nReport bugs to lzip-bug@nongnu.org\n"
          "Lunzip home page: http://www.nongnu.org/lzip/lunzip.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( "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n"
          "This is free software: you are free to change and redistribute it.\n"
          "There is NO WARRANTY, to the extent permitted by law.\n" );
  }


static 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, "dictionary size %s%4u %sB.  ", 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 bool no_ofile )
  {
  int 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 ) && ( !can_read || !no_ofile ) ) )
      {
      if( verbosity >= 0 )
        fprintf( stderr, "%s: Input file '%s' is not a regular file%s.\n",
                 program_name, name,
                 ( can_read && !no_ofile ) ?
                 " and '--stdout' was not specified" : "" );
      close( infd );
      infd = -1;
      }
    }
  return infd;
  }


/* 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_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_APPEND | O_CREAT | O_RDWR | 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 );
  }


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 );
  }


     /* Set permissions, owner and times. */
static 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 ) 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 decompress( const int buffer_size, const int infd,
                       struct Pretty_print * const pp, const bool testing )
  {
  unsigned long long partial_file_pos = 0;
  struct Range_decoder rdec;
  int retval = 0;
  bool first_member;
  if( !Rd_init( &rdec, infd ) )
    {
    show_error( "Not enough memory.", 0, false );
    cleanup_and_fail( 1 );
    }

  for( first_member = true; ; first_member = false )
    {
    int result;
    File_header header;
    struct LZ_decoder decoder;
    Rd_reset_member_position( &rdec );
    Rd_read_data( &rdec, header, Fh_size );
    if( Rd_finished( &rdec ) )			/* End Of File */
      {
      if( first_member )
        { Pp_show_msg( pp, "File ends unexpectedly at member header" );
          retval = 2; }
      break;
      }
    if( !Fh_verify_magic( header ) )
      {
      if( !first_member ) break;		/* trailing garbage */
      Pp_show_msg( pp, "Bad magic number (file not in lzip format)" );
      retval = 2; break;
      }
    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; }

    if( verbosity >= 2 || ( verbosity == 1 && first_member ) )
      { Pp_show_msg( pp, 0 ); if( verbosity >= 3 ) show_header( header ); }

    if( !LZd_init( &decoder, header, &rdec, buffer_size, outfd ) )
      {
      show_error( "Not enough memory. Try a smaller output buffer size.", 0, false );
      cleanup_and_fail( 1 );
      }
    result = LZd_decode_member( &decoder, pp );
    partial_file_pos += Rd_member_position( &rdec );
    LZd_free( &decoder );
    if( result != 0 )
      {
      if( verbosity >= 0 && result <= 2 )
        {
        Pp_show_msg( pp, 0 );
        if( result == 2 )
          fprintf( stderr, "File ends unexpectedly at pos %llu\n",
                   partial_file_pos );
        else
          fprintf( stderr, "Decoder error at pos %llu\n", partial_file_pos );
        }
      retval = 2; break;
      }
    if( verbosity >= 2 )
      { fprintf( stderr, testing ? "ok\n" : "done\n" ); Pp_reset( pp ); }
    }
  Rd_free( &rdec );
  if( verbosity == 1 && retval == 0 )
    fprintf( stderr, testing ? "ok\n" : "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 )
  {
  unsigned stdin_name_len;
  int i;
  pp->name = 0;
  pp->stdin_name = "(stdin)";
  pp->longest_name = 0;
  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 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[] )
  {
  const char * input_filename = "";
  const char * default_output_filename = "";
  const char ** filenames = 0;
  int num_filenames = 0;
  int buffer_size = max_dictionary_size;
  int infd = -1;
  int argind = 0;
  int retval = 0;
  int i;
  bool filenames_given = false;
  bool force = false;
  bool keep_input_files = false;
  bool testing = false;
  bool to_stdout = false;
  struct Pretty_print pp;

  const struct ap_Option options[] =
    {
    { 'c', "stdout",          ap_no  },
    { 'd', "decompress",      ap_no  },
    { 'f', "force",           ap_no  },
    { 'h', "help",            ap_no  },
    { 'k', "keep",            ap_no  },
    { 'n', "threads",         ap_yes },
    { 'o', "output",          ap_yes },
    { 'q', "quiet",           ap_no  },
    { 't', "test",            ap_no  },
    { 'u', "buffer-size",     ap_yes },
    { '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( "Not enough memory.", 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 'c': to_stdout = true; break;
      case 'd': testing = false; break;
      case 'f': force = true; break;
      case 'h': show_help(); return 0;
      case 'k': keep_input_files = true; break;
      case 'n': break;
      case 'o': default_output_filename = arg; break;
      case 'q': verbosity = -1; break;
      case 't': testing = true; break;
      case 'u': buffer_size = get_dict_size( arg ); 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( testing )
    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( buffer_size < max_dictionary_size )
    {
    if( to_stdout || testing )
      { show_error( "'--buffer-size' is incompatible with '--stdout' and '--test'.", 0, false );
        return 1; }
    if( !default_output_filename[0] )
      for( i = 0; i < num_filenames; ++i )
        if( !filenames[i][0] || strcmp( filenames[i], "-" ) == 0 )
          { show_error( "Output file must be specified when decompressing from stdin with a\n"
                        "        reduced buffer size.", 0, false );
            return 1; }
    }

  if( !to_stdout && !testing &&
      ( filenames_given || default_output_filename[0] ) )
    set_signals();

  Pp_init( &pp, filenames, num_filenames );

  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( !testing )
        {
        if( to_stdout || !default_output_filename[0] )
          outfd = STDOUT_FILENO;
        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
      {
      input_filename = filenames[i];
      infd = open_instream( input_filename, &in_stats, to_stdout || testing );
      if( infd < 0 ) { if( retval < 1 ) retval = 1; continue; }
      if( !testing )
        {
        if( to_stdout ) outfd = STDOUT_FILENO;
        else
          {
          set_d_outname( input_filename, extension_index( input_filename ) );
          outfd_mode = usr_rw;
          if( !open_outstream( force ) )
            {
            if( retval < 1 ) retval = 1;
            close( infd ); infd = -1;
            continue;
            }
          }
        }
      }

    if( isatty( infd ) )
      {
      show_error( "I won't read compressed data from a terminal.", 0, true );
      return 1;
      }

    if( output_filename[0] && !to_stdout && !testing )
      delete_output_on_interrupt = true;
    in_statsp = input_filename[0] ? &in_stats : 0;
    Pp_set_name( &pp, input_filename );
    tmp = decompress( buffer_size, infd, &pp, testing );
    if( tmp > retval ) retval = tmp;
    if( tmp && !testing ) 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 && !testing )
        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;
  }