1/*
2 * jpegtran.c
3 *
4 * Copyright (C) 1995-1997, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
7 *
8 * This file contains a command-line user interface for JPEG transcoding.
9 * It is very similar to cjpeg.c, but provides lossless transcoding between
10 * different JPEG file formats.  It also provides some lossless and sort-of-
11 * lossless transformations of JPEG data.
12 */
13
14#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
15#include "transupp.h"		/* Support routines for jpegtran */
16#include "jversion.h"		/* for version message */
17
18#ifdef USE_CCOMMAND		/* command-line reader for Macintosh */
19#ifdef __MWERKS__
20#include <SIOUX.h>              /* Metrowerks needs this */
21#include <console.h>		/* ... and this */
22#endif
23#ifdef THINK_C
24#include <console.h>		/* Think declares it here */
25#endif
26#endif
27
28
29/*
30 * Argument-parsing code.
31 * The switch parser is designed to be useful with DOS-style command line
32 * syntax, ie, intermixed switches and file names, where only the switches
33 * to the left of a given file name affect processing of that file.
34 * The main program in this file doesn't actually use this capability...
35 */
36
37
38static const char * progname;	/* program name for error messages */
39static char * outfilename;	/* for -outfile switch */
40static JCOPY_OPTION copyoption;	/* -copy switch */
41static jpeg_transform_info transformoption; /* image transformation options */
42
43
44LOCAL(void)
45usage (void)
46/* complain about bad command line */
47{
48  fprintf(stderr, "usage: %s [switches] ", progname);
49#ifdef TWO_FILE_COMMANDLINE
50  fprintf(stderr, "inputfile outputfile\n");
51#else
52  fprintf(stderr, "[inputfile]\n");
53#endif
54
55  fprintf(stderr, "Switches (names may be abbreviated):\n");
56  fprintf(stderr, "  -copy none     Copy no extra markers from source file\n");
57  fprintf(stderr, "  -copy comments Copy only comment markers (default)\n");
58  fprintf(stderr, "  -copy all      Copy all extra markers\n");
59#ifdef ENTROPY_OPT_SUPPORTED
60  fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
61#endif
62#ifdef C_PROGRESSIVE_SUPPORTED
63  fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
64#endif
65#if TRANSFORMS_SUPPORTED
66  fprintf(stderr, "Switches for modifying the image:\n");
67  fprintf(stderr, "  -grayscale     Reduce to grayscale (omit color data)\n");
68  fprintf(stderr, "  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)\n");
69  fprintf(stderr, "  -rotate [90|180|270]         Rotate image (degrees clockwise)\n");
70  fprintf(stderr, "  -transpose     Transpose image\n");
71  fprintf(stderr, "  -transverse    Transverse transpose image\n");
72  fprintf(stderr, "  -trim          Drop non-transformable edge blocks\n");
73#endif /* TRANSFORMS_SUPPORTED */
74  fprintf(stderr, "Switches for advanced users:\n");
75  fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
76  fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
77  fprintf(stderr, "  -outfile name  Specify name for output file\n");
78  fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
79  fprintf(stderr, "Switches for wizards:\n");
80#ifdef C_ARITH_CODING_SUPPORTED
81  fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
82#endif
83#ifdef C_MULTISCAN_FILES_SUPPORTED
84  fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
85#endif
86  exit(EXIT_FAILURE);
87}
88
89
90LOCAL(void)
91select_transform (JXFORM_CODE transform)
92/* Silly little routine to detect multiple transform options,
93 * which we can't handle.
94 */
95{
96#if TRANSFORMS_SUPPORTED
97  if (transformoption.transform == JXFORM_NONE ||
98      transformoption.transform == transform) {
99    transformoption.transform = transform;
100  } else {
101    fprintf(stderr, "%s: can only do one image transformation at a time\n",
102	    progname);
103    usage();
104  }
105#else
106  fprintf(stderr, "%s: sorry, image transformation was not compiled\n",
107	  progname);
108  exit(EXIT_FAILURE);
109#endif
110}
111
112
113LOCAL(int)
114parse_switches (j_compress_ptr cinfo, int argc, char **argv,
115		int last_file_arg_seen, boolean for_real)
116/* Parse optional switches.
117 * Returns argv[] index of first file-name argument (== argc if none).
118 * Any file names with indexes <= last_file_arg_seen are ignored;
119 * they have presumably been processed in a previous iteration.
120 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
121 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
122 * processing.
123 */
124{
125  int argn;
126  char * arg;
127  boolean simple_progressive;
128  char * scansarg = NULL;	/* saves -scans parm if any */
129
130  /* Set up default JPEG parameters. */
131  simple_progressive = FALSE;
132  outfilename = NULL;
133  copyoption = JCOPYOPT_DEFAULT;
134  transformoption.transform = JXFORM_NONE;
135  transformoption.trim = FALSE;
136  transformoption.force_grayscale = FALSE;
137  cinfo->err->trace_level = 0;
138
139  /* Scan command line options, adjust parameters */
140
141  for (argn = 1; argn < argc; argn++) {
142    arg = argv[argn];
143    if (*arg != '-') {
144      /* Not a switch, must be a file name argument */
145      if (argn <= last_file_arg_seen) {
146	outfilename = NULL;	/* -outfile applies to just one input file */
147	continue;		/* ignore this name if previously processed */
148      }
149      break;			/* else done parsing switches */
150    }
151    arg++;			/* advance past switch marker character */
152
153    if (keymatch(arg, "arithmetic", 1)) {
154      /* Use arithmetic coding. */
155#ifdef C_ARITH_CODING_SUPPORTED
156      cinfo->arith_code = TRUE;
157#else
158      fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
159	      progname);
160      exit(EXIT_FAILURE);
161#endif
162
163    } else if (keymatch(arg, "copy", 1)) {
164      /* Select which extra markers to copy. */
165      if (++argn >= argc)	/* advance to next argument */
166	usage();
167      if (keymatch(argv[argn], "none", 1)) {
168	copyoption = JCOPYOPT_NONE;
169      } else if (keymatch(argv[argn], "comments", 1)) {
170	copyoption = JCOPYOPT_COMMENTS;
171      } else if (keymatch(argv[argn], "all", 1)) {
172	copyoption = JCOPYOPT_ALL;
173      } else
174	usage();
175
176    } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
177      /* Enable debug printouts. */
178      /* On first -d, print version identification */
179      static boolean printed_version = FALSE;
180
181      if (! printed_version) {
182	fprintf(stderr, "Independent JPEG Group's JPEGTRAN, version %s\n%s\n",
183		JVERSION, JCOPYRIGHT);
184	printed_version = TRUE;
185      }
186      cinfo->err->trace_level++;
187
188    } else if (keymatch(arg, "flip", 1)) {
189      /* Mirror left-right or top-bottom. */
190      if (++argn >= argc)	/* advance to next argument */
191	usage();
192      if (keymatch(argv[argn], "horizontal", 1))
193	select_transform(JXFORM_FLIP_H);
194      else if (keymatch(argv[argn], "vertical", 1))
195	select_transform(JXFORM_FLIP_V);
196      else
197	usage();
198
199    } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) {
200      /* Force to grayscale. */
201#if TRANSFORMS_SUPPORTED
202      transformoption.force_grayscale = TRUE;
203#else
204      select_transform(JXFORM_NONE);	/* force an error */
205#endif
206
207    } else if (keymatch(arg, "maxmemory", 3)) {
208      /* Maximum memory in Kb (or Mb with 'm'). */
209      long lval;
210      char ch = 'x';
211
212      if (++argn >= argc)	/* advance to next argument */
213	usage();
214      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
215	usage();
216      if (ch == 'm' || ch == 'M')
217	lval *= 1000L;
218      cinfo->mem->max_memory_to_use = lval * 1000L;
219
220    } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
221      /* Enable entropy parm optimization. */
222#ifdef ENTROPY_OPT_SUPPORTED
223      cinfo->optimize_coding = TRUE;
224#else
225      fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
226	      progname);
227      exit(EXIT_FAILURE);
228#endif
229
230    } else if (keymatch(arg, "outfile", 4)) {
231      /* Set output file name. */
232      if (++argn >= argc)	/* advance to next argument */
233	usage();
234      outfilename = argv[argn];	/* save it away for later use */
235
236    } else if (keymatch(arg, "progressive", 1)) {
237      /* Select simple progressive mode. */
238#ifdef C_PROGRESSIVE_SUPPORTED
239      simple_progressive = TRUE;
240      /* We must postpone execution until num_components is known. */
241#else
242      fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
243	      progname);
244      exit(EXIT_FAILURE);
245#endif
246
247    } else if (keymatch(arg, "restart", 1)) {
248      /* Restart interval in MCU rows (or in MCUs with 'b'). */
249      long lval;
250      char ch = 'x';
251
252      if (++argn >= argc)	/* advance to next argument */
253	usage();
254      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
255	usage();
256      if (lval < 0 || lval > 65535L)
257	usage();
258      if (ch == 'b' || ch == 'B') {
259	cinfo->restart_interval = (unsigned int) lval;
260	cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
261      } else {
262	cinfo->restart_in_rows = (int) lval;
263	/* restart_interval will be computed during startup */
264      }
265
266    } else if (keymatch(arg, "rotate", 2)) {
267      /* Rotate 90, 180, or 270 degrees (measured clockwise). */
268      if (++argn >= argc)	/* advance to next argument */
269	usage();
270      if (keymatch(argv[argn], "90", 2))
271	select_transform(JXFORM_ROT_90);
272      else if (keymatch(argv[argn], "180", 3))
273	select_transform(JXFORM_ROT_180);
274      else if (keymatch(argv[argn], "270", 3))
275	select_transform(JXFORM_ROT_270);
276      else
277	usage();
278
279    } else if (keymatch(arg, "scans", 1)) {
280      /* Set scan script. */
281#ifdef C_MULTISCAN_FILES_SUPPORTED
282      if (++argn >= argc)	/* advance to next argument */
283	usage();
284      scansarg = argv[argn];
285      /* We must postpone reading the file in case -progressive appears. */
286#else
287      fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
288	      progname);
289      exit(EXIT_FAILURE);
290#endif
291
292    } else if (keymatch(arg, "transpose", 1)) {
293      /* Transpose (across UL-to-LR axis). */
294      select_transform(JXFORM_TRANSPOSE);
295
296    } else if (keymatch(arg, "transverse", 6)) {
297      /* Transverse transpose (across UR-to-LL axis). */
298      select_transform(JXFORM_TRANSVERSE);
299
300    } else if (keymatch(arg, "trim", 3)) {
301      /* Trim off any partial edge MCUs that the transform can't handle. */
302      transformoption.trim = TRUE;
303
304    } else {
305      usage();			/* bogus switch */
306    }
307  }
308
309  /* Post-switch-scanning cleanup */
310
311  if (for_real) {
312
313#ifdef C_PROGRESSIVE_SUPPORTED
314    if (simple_progressive)	/* process -progressive; -scans can override */
315      jpeg_simple_progression(cinfo);
316#endif
317
318#ifdef C_MULTISCAN_FILES_SUPPORTED
319    if (scansarg != NULL)	/* process -scans if it was present */
320      if (! read_scan_script(cinfo, scansarg))
321	usage();
322#endif
323  }
324
325  return argn;			/* return index of next arg (file name) */
326}
327
328
329/*
330 * The main program.
331 */
332
333int
334main (int argc, char **argv)
335{
336  struct jpeg_decompress_struct srcinfo;
337  struct jpeg_compress_struct dstinfo;
338  struct jpeg_error_mgr jsrcerr, jdsterr;
339#ifdef PROGRESS_REPORT
340  struct cdjpeg_progress_mgr progress;
341#endif
342  jvirt_barray_ptr * src_coef_arrays;
343  jvirt_barray_ptr * dst_coef_arrays;
344  int file_index;
345  FILE * input_file;
346  FILE * output_file;
347
348  /* On Mac, fetch a command line. */
349#ifdef USE_CCOMMAND
350  argc = ccommand(&argv);
351#endif
352
353  progname = argv[0];
354  if (progname == NULL || progname[0] == 0)
355    progname = "jpegtran";	/* in case C library doesn't provide it */
356
357  /* Initialize the JPEG decompression object with default error handling. */
358  srcinfo.err = jpeg_std_error(&jsrcerr);
359  jpeg_create_decompress(&srcinfo);
360  /* Initialize the JPEG compression object with default error handling. */
361  dstinfo.err = jpeg_std_error(&jdsterr);
362  jpeg_create_compress(&dstinfo);
363
364  /* Now safe to enable signal catcher.
365   * Note: we assume only the decompression object will have virtual arrays.
366   */
367#ifdef NEED_SIGNAL_CATCHER
368  enable_signal_catcher((j_common_ptr) &srcinfo);
369#endif
370
371  /* Scan command line to find file names.
372   * It is convenient to use just one switch-parsing routine, but the switch
373   * values read here are mostly ignored; we will rescan the switches after
374   * opening the input file.  Also note that most of the switches affect the
375   * destination JPEG object, so we parse into that and then copy over what
376   * needs to affects the source too.
377   */
378
379  file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);
380  jsrcerr.trace_level = jdsterr.trace_level;
381  srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;
382
383#ifdef TWO_FILE_COMMANDLINE
384  /* Must have either -outfile switch or explicit output file name */
385  if (outfilename == NULL) {
386    if (file_index != argc-2) {
387      fprintf(stderr, "%s: must name one input and one output file\n",
388	      progname);
389      usage();
390    }
391    outfilename = argv[file_index+1];
392  } else {
393    if (file_index != argc-1) {
394      fprintf(stderr, "%s: must name one input and one output file\n",
395	      progname);
396      usage();
397    }
398  }
399#else
400  /* Unix style: expect zero or one file name */
401  if (file_index < argc-1) {
402    fprintf(stderr, "%s: only one input file\n", progname);
403    usage();
404  }
405#endif /* TWO_FILE_COMMANDLINE */
406
407  /* Open the input file. */
408  if (file_index < argc) {
409    if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
410      fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
411      exit(EXIT_FAILURE);
412    }
413  } else {
414    /* default input file is stdin */
415    input_file = read_stdin();
416  }
417
418  /* Open the output file. */
419  if (outfilename != NULL) {
420    if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
421      fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
422      exit(EXIT_FAILURE);
423    }
424  } else {
425    /* default output file is stdout */
426    output_file = write_stdout();
427  }
428
429#ifdef PROGRESS_REPORT
430  start_progress_monitor((j_common_ptr) &dstinfo, &progress);
431#endif
432
433  /* Specify data source for decompression */
434  jpeg_stdio_src(&srcinfo, input_file);
435
436  /* Enable saving of extra markers that we want to copy */
437  jcopy_markers_setup(&srcinfo, copyoption);
438
439  /* Read file header */
440  (void) jpeg_read_header(&srcinfo, TRUE);
441
442  /* Any space needed by a transform option must be requested before
443   * jpeg_read_coefficients so that memory allocation will be done right.
444   */
445#if TRANSFORMS_SUPPORTED
446  jtransform_request_workspace(&srcinfo, &transformoption);
447#endif
448
449  /* Read source file as DCT coefficients */
450  src_coef_arrays = jpeg_read_coefficients(&srcinfo);
451
452  /* Initialize destination compression parameters from source values */
453  jpeg_copy_critical_parameters(&srcinfo, &dstinfo);
454
455  /* Adjust destination parameters if required by transform options;
456   * also find out which set of coefficient arrays will hold the output.
457   */
458#if TRANSFORMS_SUPPORTED
459  dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,
460						 src_coef_arrays,
461						 &transformoption);
462#else
463  dst_coef_arrays = src_coef_arrays;
464#endif
465
466  /* Adjust default compression parameters by re-parsing the options */
467  file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);
468
469  /* Specify data destination for compression */
470  jpeg_stdio_dest(&dstinfo, output_file);
471
472  /* Start compressor (note no image data is actually written here) */
473  jpeg_write_coefficients(&dstinfo, dst_coef_arrays);
474
475  /* Copy to the output file any extra markers that we want to preserve */
476  jcopy_markers_execute(&srcinfo, &dstinfo, copyoption);
477
478  /* Execute image transformation, if any */
479#if TRANSFORMS_SUPPORTED
480  jtransform_execute_transformation(&srcinfo, &dstinfo,
481				    src_coef_arrays,
482				    &transformoption);
483#endif
484
485  /* Finish compression and release memory */
486  jpeg_finish_compress(&dstinfo);
487  jpeg_destroy_compress(&dstinfo);
488  (void) jpeg_finish_decompress(&srcinfo);
489  jpeg_destroy_decompress(&srcinfo);
490
491  /* Close files, if we opened them */
492  if (input_file != stdin)
493    fclose(input_file);
494  if (output_file != stdout)
495    fclose(output_file);
496
497#ifdef PROGRESS_REPORT
498  end_progress_monitor((j_common_ptr) &dstinfo);
499#endif
500
501  /* All done. */
502  exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);
503  return 0;			/* suppress no-return-value warnings */
504}
505