File: jpegtran.c

package info (click to toggle)
libjpeg-mmx 0.1.3-3
  • links: PTS
  • area: main
  • in suites: woody
  • size: 2,700 kB
  • ctags: 2,672
  • sloc: ansic: 24,900; sh: 4,565; makefile: 59
file content (504 lines) | stat: -rw-r--r-- 16,227 bytes parent folder | download | duplicates (60)
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
/*
 * jpegtran.c
 *
 * Copyright (C) 1995-1997, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains a command-line user interface for JPEG transcoding.
 * It is very similar to cjpeg.c, but provides lossless transcoding between
 * different JPEG file formats.  It also provides some lossless and sort-of-
 * lossless transformations of JPEG data.
 */

#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
#include "transupp.h"		/* Support routines for jpegtran */
#include "jversion.h"		/* for version message */

#ifdef USE_CCOMMAND		/* command-line reader for Macintosh */
#ifdef __MWERKS__
#include <SIOUX.h>              /* Metrowerks needs this */
#include <console.h>		/* ... and this */
#endif
#ifdef THINK_C
#include <console.h>		/* Think declares it here */
#endif
#endif


/*
 * Argument-parsing code.
 * The switch parser is designed to be useful with DOS-style command line
 * syntax, ie, intermixed switches and file names, where only the switches
 * to the left of a given file name affect processing of that file.
 * The main program in this file doesn't actually use this capability...
 */


static const char * progname;	/* program name for error messages */
static char * outfilename;	/* for -outfile switch */
static JCOPY_OPTION copyoption;	/* -copy switch */
static jpeg_transform_info transformoption; /* image transformation options */


LOCAL(void)
usage (void)
/* complain about bad command line */
{
  fprintf(stderr, "usage: %s [switches] ", progname);
#ifdef TWO_FILE_COMMANDLINE
  fprintf(stderr, "inputfile outputfile\n");
#else
  fprintf(stderr, "[inputfile]\n");
#endif

  fprintf(stderr, "Switches (names may be abbreviated):\n");
  fprintf(stderr, "  -copy none     Copy no extra markers from source file\n");
  fprintf(stderr, "  -copy comments Copy only comment markers (default)\n");
  fprintf(stderr, "  -copy all      Copy all extra markers\n");
#ifdef ENTROPY_OPT_SUPPORTED
  fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
#endif
#ifdef C_PROGRESSIVE_SUPPORTED
  fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
#endif
#if TRANSFORMS_SUPPORTED
  fprintf(stderr, "Switches for modifying the image:\n");
  fprintf(stderr, "  -grayscale     Reduce to grayscale (omit color data)\n");
  fprintf(stderr, "  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)\n");
  fprintf(stderr, "  -rotate [90|180|270]         Rotate image (degrees clockwise)\n");
  fprintf(stderr, "  -transpose     Transpose image\n");
  fprintf(stderr, "  -transverse    Transverse transpose image\n");
  fprintf(stderr, "  -trim          Drop non-transformable edge blocks\n");
#endif /* TRANSFORMS_SUPPORTED */
  fprintf(stderr, "Switches for advanced users:\n");
  fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
  fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
  fprintf(stderr, "  -outfile name  Specify name for output file\n");
  fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
  fprintf(stderr, "Switches for wizards:\n");
#ifdef C_ARITH_CODING_SUPPORTED
  fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
#endif
#ifdef C_MULTISCAN_FILES_SUPPORTED
  fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
#endif
  exit(EXIT_FAILURE);
}


LOCAL(void)
select_transform (JXFORM_CODE transform)
/* Silly little routine to detect multiple transform options,
 * which we can't handle.
 */
{
#if TRANSFORMS_SUPPORTED
  if (transformoption.transform == JXFORM_NONE ||
      transformoption.transform == transform) {
    transformoption.transform = transform;
  } else {
    fprintf(stderr, "%s: can only do one image transformation at a time\n",
	    progname);
    usage();
  }
#else
  fprintf(stderr, "%s: sorry, image transformation was not compiled\n",
	  progname);
  exit(EXIT_FAILURE);
#endif
}


LOCAL(int)
parse_switches (j_compress_ptr cinfo, int argc, char **argv,
		int last_file_arg_seen, boolean for_real)
/* Parse optional switches.
 * Returns argv[] index of first file-name argument (== argc if none).
 * Any file names with indexes <= last_file_arg_seen are ignored;
 * they have presumably been processed in a previous iteration.
 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
 * processing.
 */
{
  int argn;
  char * arg;
  boolean simple_progressive;
  char * scansarg = NULL;	/* saves -scans parm if any */

  /* Set up default JPEG parameters. */
  simple_progressive = FALSE;
  outfilename = NULL;
  copyoption = JCOPYOPT_DEFAULT;
  transformoption.transform = JXFORM_NONE;
  transformoption.trim = FALSE;
  transformoption.force_grayscale = FALSE;
  cinfo->err->trace_level = 0;

  /* Scan command line options, adjust parameters */

  for (argn = 1; argn < argc; argn++) {
    arg = argv[argn];
    if (*arg != '-') {
      /* Not a switch, must be a file name argument */
      if (argn <= last_file_arg_seen) {
	outfilename = NULL;	/* -outfile applies to just one input file */
	continue;		/* ignore this name if previously processed */
      }
      break;			/* else done parsing switches */
    }
    arg++;			/* advance past switch marker character */

    if (keymatch(arg, "arithmetic", 1)) {
      /* Use arithmetic coding. */
#ifdef C_ARITH_CODING_SUPPORTED
      cinfo->arith_code = TRUE;
#else
      fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
	      progname);
      exit(EXIT_FAILURE);
#endif

    } else if (keymatch(arg, "copy", 1)) {
      /* Select which extra markers to copy. */
      if (++argn >= argc)	/* advance to next argument */
	usage();
      if (keymatch(argv[argn], "none", 1)) {
	copyoption = JCOPYOPT_NONE;
      } else if (keymatch(argv[argn], "comments", 1)) {
	copyoption = JCOPYOPT_COMMENTS;
      } else if (keymatch(argv[argn], "all", 1)) {
	copyoption = JCOPYOPT_ALL;
      } else
	usage();

    } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
      /* Enable debug printouts. */
      /* On first -d, print version identification */
      static boolean printed_version = FALSE;

      if (! printed_version) {
	fprintf(stderr, "Independent JPEG Group's JPEGTRAN, version %s\n%s\n",
		JVERSION, JCOPYRIGHT);
	printed_version = TRUE;
      }
      cinfo->err->trace_level++;

    } else if (keymatch(arg, "flip", 1)) {
      /* Mirror left-right or top-bottom. */
      if (++argn >= argc)	/* advance to next argument */
	usage();
      if (keymatch(argv[argn], "horizontal", 1))
	select_transform(JXFORM_FLIP_H);
      else if (keymatch(argv[argn], "vertical", 1))
	select_transform(JXFORM_FLIP_V);
      else
	usage();

    } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) {
      /* Force to grayscale. */
#if TRANSFORMS_SUPPORTED
      transformoption.force_grayscale = TRUE;
#else
      select_transform(JXFORM_NONE);	/* force an error */
#endif

    } else if (keymatch(arg, "maxmemory", 3)) {
      /* Maximum memory in Kb (or Mb with 'm'). */
      long lval;
      char ch = 'x';

      if (++argn >= argc)	/* advance to next argument */
	usage();
      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
	usage();
      if (ch == 'm' || ch == 'M')
	lval *= 1000L;
      cinfo->mem->max_memory_to_use = lval * 1000L;

    } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
      /* Enable entropy parm optimization. */
#ifdef ENTROPY_OPT_SUPPORTED
      cinfo->optimize_coding = TRUE;
#else
      fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
	      progname);
      exit(EXIT_FAILURE);
#endif

    } else if (keymatch(arg, "outfile", 4)) {
      /* Set output file name. */
      if (++argn >= argc)	/* advance to next argument */
	usage();
      outfilename = argv[argn];	/* save it away for later use */

    } else if (keymatch(arg, "progressive", 1)) {
      /* Select simple progressive mode. */
#ifdef C_PROGRESSIVE_SUPPORTED
      simple_progressive = TRUE;
      /* We must postpone execution until num_components is known. */
#else
      fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
	      progname);
      exit(EXIT_FAILURE);
#endif

    } else if (keymatch(arg, "restart", 1)) {
      /* Restart interval in MCU rows (or in MCUs with 'b'). */
      long lval;
      char ch = 'x';

      if (++argn >= argc)	/* advance to next argument */
	usage();
      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
	usage();
      if (lval < 0 || lval > 65535L)
	usage();
      if (ch == 'b' || ch == 'B') {
	cinfo->restart_interval = (unsigned int) lval;
	cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
      } else {
	cinfo->restart_in_rows = (int) lval;
	/* restart_interval will be computed during startup */
      }

    } else if (keymatch(arg, "rotate", 2)) {
      /* Rotate 90, 180, or 270 degrees (measured clockwise). */
      if (++argn >= argc)	/* advance to next argument */
	usage();
      if (keymatch(argv[argn], "90", 2))
	select_transform(JXFORM_ROT_90);
      else if (keymatch(argv[argn], "180", 3))
	select_transform(JXFORM_ROT_180);
      else if (keymatch(argv[argn], "270", 3))
	select_transform(JXFORM_ROT_270);
      else
	usage();

    } else if (keymatch(arg, "scans", 1)) {
      /* Set scan script. */
#ifdef C_MULTISCAN_FILES_SUPPORTED
      if (++argn >= argc)	/* advance to next argument */
	usage();
      scansarg = argv[argn];
      /* We must postpone reading the file in case -progressive appears. */
#else
      fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
	      progname);
      exit(EXIT_FAILURE);
#endif

    } else if (keymatch(arg, "transpose", 1)) {
      /* Transpose (across UL-to-LR axis). */
      select_transform(JXFORM_TRANSPOSE);

    } else if (keymatch(arg, "transverse", 6)) {
      /* Transverse transpose (across UR-to-LL axis). */
      select_transform(JXFORM_TRANSVERSE);

    } else if (keymatch(arg, "trim", 3)) {
      /* Trim off any partial edge MCUs that the transform can't handle. */
      transformoption.trim = TRUE;

    } else {
      usage();			/* bogus switch */
    }
  }

  /* Post-switch-scanning cleanup */

  if (for_real) {

#ifdef C_PROGRESSIVE_SUPPORTED
    if (simple_progressive)	/* process -progressive; -scans can override */
      jpeg_simple_progression(cinfo);
#endif

#ifdef C_MULTISCAN_FILES_SUPPORTED
    if (scansarg != NULL)	/* process -scans if it was present */
      if (! read_scan_script(cinfo, scansarg))
	usage();
#endif
  }

  return argn;			/* return index of next arg (file name) */
}


/*
 * The main program.
 */

int
main (int argc, char **argv)
{
  struct jpeg_decompress_struct srcinfo;
  struct jpeg_compress_struct dstinfo;
  struct jpeg_error_mgr jsrcerr, jdsterr;
#ifdef PROGRESS_REPORT
  struct cdjpeg_progress_mgr progress;
#endif
  jvirt_barray_ptr * src_coef_arrays;
  jvirt_barray_ptr * dst_coef_arrays;
  int file_index;
  FILE * input_file;
  FILE * output_file;

  /* On Mac, fetch a command line. */
#ifdef USE_CCOMMAND
  argc = ccommand(&argv);
#endif

  progname = argv[0];
  if (progname == NULL || progname[0] == 0)
    progname = "jpegtran";	/* in case C library doesn't provide it */

  /* Initialize the JPEG decompression object with default error handling. */
  srcinfo.err = jpeg_std_error(&jsrcerr);
  jpeg_create_decompress(&srcinfo);
  /* Initialize the JPEG compression object with default error handling. */
  dstinfo.err = jpeg_std_error(&jdsterr);
  jpeg_create_compress(&dstinfo);

  /* Now safe to enable signal catcher.
   * Note: we assume only the decompression object will have virtual arrays.
   */
#ifdef NEED_SIGNAL_CATCHER
  enable_signal_catcher((j_common_ptr) &srcinfo);
#endif

  /* Scan command line to find file names.
   * It is convenient to use just one switch-parsing routine, but the switch
   * values read here are mostly ignored; we will rescan the switches after
   * opening the input file.  Also note that most of the switches affect the
   * destination JPEG object, so we parse into that and then copy over what
   * needs to affects the source too.
   */

  file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);
  jsrcerr.trace_level = jdsterr.trace_level;
  srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;

#ifdef TWO_FILE_COMMANDLINE
  /* Must have either -outfile switch or explicit output file name */
  if (outfilename == NULL) {
    if (file_index != argc-2) {
      fprintf(stderr, "%s: must name one input and one output file\n",
	      progname);
      usage();
    }
    outfilename = argv[file_index+1];
  } else {
    if (file_index != argc-1) {
      fprintf(stderr, "%s: must name one input and one output file\n",
	      progname);
      usage();
    }
  }
#else
  /* Unix style: expect zero or one file name */
  if (file_index < argc-1) {
    fprintf(stderr, "%s: only one input file\n", progname);
    usage();
  }
#endif /* TWO_FILE_COMMANDLINE */

  /* Open the input file. */
  if (file_index < argc) {
    if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
      fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
      exit(EXIT_FAILURE);
    }
  } else {
    /* default input file is stdin */
    input_file = read_stdin();
  }

  /* Open the output file. */
  if (outfilename != NULL) {
    if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
      fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
      exit(EXIT_FAILURE);
    }
  } else {
    /* default output file is stdout */
    output_file = write_stdout();
  }

#ifdef PROGRESS_REPORT
  start_progress_monitor((j_common_ptr) &dstinfo, &progress);
#endif

  /* Specify data source for decompression */
  jpeg_stdio_src(&srcinfo, input_file);

  /* Enable saving of extra markers that we want to copy */
  jcopy_markers_setup(&srcinfo, copyoption);

  /* Read file header */
  (void) jpeg_read_header(&srcinfo, TRUE);

  /* Any space needed by a transform option must be requested before
   * jpeg_read_coefficients so that memory allocation will be done right.
   */
#if TRANSFORMS_SUPPORTED
  jtransform_request_workspace(&srcinfo, &transformoption);
#endif

  /* Read source file as DCT coefficients */
  src_coef_arrays = jpeg_read_coefficients(&srcinfo);

  /* Initialize destination compression parameters from source values */
  jpeg_copy_critical_parameters(&srcinfo, &dstinfo);

  /* Adjust destination parameters if required by transform options;
   * also find out which set of coefficient arrays will hold the output.
   */
#if TRANSFORMS_SUPPORTED
  dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,
						 src_coef_arrays,
						 &transformoption);
#else
  dst_coef_arrays = src_coef_arrays;
#endif

  /* Adjust default compression parameters by re-parsing the options */
  file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);

  /* Specify data destination for compression */
  jpeg_stdio_dest(&dstinfo, output_file);

  /* Start compressor (note no image data is actually written here) */
  jpeg_write_coefficients(&dstinfo, dst_coef_arrays);

  /* Copy to the output file any extra markers that we want to preserve */
  jcopy_markers_execute(&srcinfo, &dstinfo, copyoption);

  /* Execute image transformation, if any */
#if TRANSFORMS_SUPPORTED
  jtransform_execute_transformation(&srcinfo, &dstinfo,
				    src_coef_arrays,
				    &transformoption);
#endif

  /* Finish compression and release memory */
  jpeg_finish_compress(&dstinfo);
  jpeg_destroy_compress(&dstinfo);
  (void) jpeg_finish_decompress(&srcinfo);
  jpeg_destroy_decompress(&srcinfo);

  /* Close files, if we opened them */
  if (input_file != stdin)
    fclose(input_file);
  if (output_file != stdout)
    fclose(output_file);

#ifdef PROGRESS_REPORT
  end_progress_monitor((j_common_ptr) &dstinfo);
#endif

  /* All done. */
  exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);
  return 0;			/* suppress no-return-value warnings */
}