1/*
2 * jpegtran.c
3 *
4 * This file was part of the Independent JPEG Group's software:
5 * Copyright (C) 1995-2010, Thomas G. Lane, Guido Vollbeding.
6 * libjpeg-turbo Modifications:
7 * Copyright (C) 2010, 2014, D. R. Commander.
8 * For conditions of distribution and use, see the accompanying README file.
9 *
10 * This file contains a command-line user interface for JPEG transcoding.
11 * It is very similar to cjpeg.c, and partly to djpeg.c, but provides
12 * lossless transcoding between different JPEG file formats.  It also
13 * provides some lossless and sort-of-lossless transformations of JPEG data.
14 */
15
16#include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
17#include "transupp.h"           /* Support routines for jpegtran */
18#include "jversion.h"           /* for version message */
19#include "jconfigint.h"
20
21#ifdef USE_CCOMMAND             /* command-line reader for Macintosh */
22#ifdef __MWERKS__
23#include <SIOUX.h>              /* Metrowerks needs this */
24#include <console.h>            /* ... and this */
25#endif
26#ifdef THINK_C
27#include <console.h>            /* Think declares it here */
28#endif
29#endif
30
31
32/*
33 * Argument-parsing code.
34 * The switch parser is designed to be useful with DOS-style command line
35 * syntax, ie, intermixed switches and file names, where only the switches
36 * to the left of a given file name affect processing of that file.
37 * The main program in this file doesn't actually use this capability...
38 */
39
40
41static const char * progname;   /* program name for error messages */
42static char * outfilename;      /* for -outfile switch */
43static JCOPY_OPTION copyoption; /* -copy switch */
44static jpeg_transform_info transformoption; /* image transformation options */
45
46
47LOCAL(void)
48usage (void)
49/* complain about bad command line */
50{
51  fprintf(stderr, "usage: %s [switches] ", progname);
52#ifdef TWO_FILE_COMMANDLINE
53  fprintf(stderr, "inputfile outputfile\n");
54#else
55  fprintf(stderr, "[inputfile]\n");
56#endif
57
58  fprintf(stderr, "Switches (names may be abbreviated):\n");
59  fprintf(stderr, "  -copy none     Copy no extra markers from source file\n");
60  fprintf(stderr, "  -copy comments Copy only comment markers (default)\n");
61  fprintf(stderr, "  -copy all      Copy all extra markers\n");
62#ifdef ENTROPY_OPT_SUPPORTED
63  fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
64#endif
65#ifdef C_PROGRESSIVE_SUPPORTED
66  fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
67#endif
68  fprintf(stderr, "Switches for modifying the image:\n");
69#if TRANSFORMS_SUPPORTED
70  fprintf(stderr, "  -crop WxH+X+Y  Crop to a rectangular subarea\n");
71  fprintf(stderr, "  -grayscale     Reduce to grayscale (omit color data)\n");
72  fprintf(stderr, "  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)\n");
73  fprintf(stderr, "  -perfect       Fail if there is non-transformable edge blocks\n");
74  fprintf(stderr, "  -rotate [90|180|270]         Rotate image (degrees clockwise)\n");
75#endif
76#if TRANSFORMS_SUPPORTED
77  fprintf(stderr, "  -transpose     Transpose image\n");
78  fprintf(stderr, "  -transverse    Transverse transpose image\n");
79  fprintf(stderr, "  -trim          Drop non-transformable edge blocks\n");
80#endif
81  fprintf(stderr, "Switches for advanced users:\n");
82#ifdef C_ARITH_CODING_SUPPORTED
83  fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
84#endif
85  fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
86  fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
87  fprintf(stderr, "  -outfile name  Specify name for output file\n");
88  fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
89  fprintf(stderr, "  -version       Print version information and exit\n");
90  fprintf(stderr, "Switches for wizards:\n");
91#ifdef C_MULTISCAN_FILES_SUPPORTED
92  fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
93#endif
94  exit(EXIT_FAILURE);
95}
96
97
98LOCAL(void)
99select_transform (JXFORM_CODE transform)
100/* Silly little routine to detect multiple transform options,
101 * which we can't handle.
102 */
103{
104#if TRANSFORMS_SUPPORTED
105  if (transformoption.transform == JXFORM_NONE ||
106      transformoption.transform == transform) {
107    transformoption.transform = transform;
108  } else {
109    fprintf(stderr, "%s: can only do one image transformation at a time\n",
110            progname);
111    usage();
112  }
113#else
114  fprintf(stderr, "%s: sorry, image transformation was not compiled\n",
115          progname);
116  exit(EXIT_FAILURE);
117#endif
118}
119
120
121LOCAL(int)
122parse_switches (j_compress_ptr cinfo, int argc, char **argv,
123                int last_file_arg_seen, boolean for_real)
124/* Parse optional switches.
125 * Returns argv[] index of first file-name argument (== argc if none).
126 * Any file names with indexes <= last_file_arg_seen are ignored;
127 * they have presumably been processed in a previous iteration.
128 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
129 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
130 * processing.
131 */
132{
133  int argn;
134  char * arg;
135  boolean simple_progressive;
136  char * scansarg = NULL;       /* saves -scans parm if any */
137
138  /* Set up default JPEG parameters. */
139  simple_progressive = FALSE;
140  outfilename = NULL;
141  copyoption = JCOPYOPT_DEFAULT;
142  transformoption.transform = JXFORM_NONE;
143  transformoption.perfect = FALSE;
144  transformoption.trim = FALSE;
145  transformoption.force_grayscale = FALSE;
146  transformoption.crop = FALSE;
147  transformoption.slow_hflip = FALSE;
148  cinfo->err->trace_level = 0;
149
150  /* Scan command line options, adjust parameters */
151
152  for (argn = 1; argn < argc; argn++) {
153    arg = argv[argn];
154    if (*arg != '-') {
155      /* Not a switch, must be a file name argument */
156      if (argn <= last_file_arg_seen) {
157        outfilename = NULL;     /* -outfile applies to just one input file */
158        continue;               /* ignore this name if previously processed */
159      }
160      break;                    /* else done parsing switches */
161    }
162    arg++;                      /* advance past switch marker character */
163
164    if (keymatch(arg, "arithmetic", 1)) {
165      /* Use arithmetic coding. */
166#ifdef C_ARITH_CODING_SUPPORTED
167      cinfo->arith_code = TRUE;
168#else
169      fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
170              progname);
171      exit(EXIT_FAILURE);
172#endif
173
174    } else if (keymatch(arg, "copy", 2)) {
175      /* Select which extra markers to copy. */
176      if (++argn >= argc)       /* advance to next argument */
177        usage();
178      if (keymatch(argv[argn], "none", 1)) {
179        copyoption = JCOPYOPT_NONE;
180      } else if (keymatch(argv[argn], "comments", 1)) {
181        copyoption = JCOPYOPT_COMMENTS;
182      } else if (keymatch(argv[argn], "all", 1)) {
183        copyoption = JCOPYOPT_ALL;
184      } else
185        usage();
186
187    } else if (keymatch(arg, "crop", 2)) {
188      /* Perform lossless cropping. */
189#if TRANSFORMS_SUPPORTED
190      if (++argn >= argc)       /* advance to next argument */
191        usage();
192      if (! jtransform_parse_crop_spec(&transformoption, argv[argn])) {
193        fprintf(stderr, "%s: bogus -crop argument '%s'\n",
194                progname, argv[argn]);
195        exit(EXIT_FAILURE);
196      }
197#else
198      select_transform(JXFORM_NONE);    /* force an error */
199#endif
200
201    } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
202      /* Enable debug printouts. */
203      /* On first -d, print version identification */
204      static boolean printed_version = FALSE;
205
206      if (! printed_version) {
207        fprintf(stderr, "%s version %s (build %s)\n",
208                PACKAGE_NAME, VERSION, BUILD);
209        fprintf(stderr, "%s\n\n", JCOPYRIGHT);
210        fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
211                JVERSION);
212        printed_version = TRUE;
213      }
214      cinfo->err->trace_level++;
215
216    } else if (keymatch(arg, "version", 4)) {
217      fprintf(stderr, "%s version %s (build %s)\n",
218              PACKAGE_NAME, VERSION, BUILD);
219      exit(EXIT_SUCCESS);
220
221    } else if (keymatch(arg, "flip", 1)) {
222      /* Mirror left-right or top-bottom. */
223      if (++argn >= argc)       /* advance to next argument */
224        usage();
225      if (keymatch(argv[argn], "horizontal", 1))
226        select_transform(JXFORM_FLIP_H);
227      else if (keymatch(argv[argn], "vertical", 1))
228        select_transform(JXFORM_FLIP_V);
229      else
230        usage();
231
232    } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) {
233      /* Force to grayscale. */
234#if TRANSFORMS_SUPPORTED
235      transformoption.force_grayscale = TRUE;
236#else
237      select_transform(JXFORM_NONE);    /* force an error */
238#endif
239
240    } else if (keymatch(arg, "maxmemory", 3)) {
241      /* Maximum memory in Kb (or Mb with 'm'). */
242      long lval;
243      char ch = 'x';
244
245      if (++argn >= argc)       /* advance to next argument */
246        usage();
247      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
248        usage();
249      if (ch == 'm' || ch == 'M')
250        lval *= 1000L;
251      cinfo->mem->max_memory_to_use = lval * 1000L;
252
253    } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
254      /* Enable entropy parm optimization. */
255#ifdef ENTROPY_OPT_SUPPORTED
256      cinfo->optimize_coding = TRUE;
257#else
258      fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
259              progname);
260      exit(EXIT_FAILURE);
261#endif
262
263    } else if (keymatch(arg, "outfile", 4)) {
264      /* Set output file name. */
265      if (++argn >= argc)       /* advance to next argument */
266        usage();
267      outfilename = argv[argn]; /* save it away for later use */
268
269    } else if (keymatch(arg, "perfect", 2)) {
270      /* Fail if there is any partial edge MCUs that the transform can't
271       * handle. */
272      transformoption.perfect = TRUE;
273
274    } else if (keymatch(arg, "progressive", 2)) {
275      /* Select simple progressive mode. */
276#ifdef C_PROGRESSIVE_SUPPORTED
277      simple_progressive = TRUE;
278      /* We must postpone execution until num_components is known. */
279#else
280      fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
281              progname);
282      exit(EXIT_FAILURE);
283#endif
284
285    } else if (keymatch(arg, "restart", 1)) {
286      /* Restart interval in MCU rows (or in MCUs with 'b'). */
287      long lval;
288      char ch = 'x';
289
290      if (++argn >= argc)       /* advance to next argument */
291        usage();
292      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
293        usage();
294      if (lval < 0 || lval > 65535L)
295        usage();
296      if (ch == 'b' || ch == 'B') {
297        cinfo->restart_interval = (unsigned int) lval;
298        cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
299      } else {
300        cinfo->restart_in_rows = (int) lval;
301        /* restart_interval will be computed during startup */
302      }
303
304    } else if (keymatch(arg, "rotate", 2)) {
305      /* Rotate 90, 180, or 270 degrees (measured clockwise). */
306      if (++argn >= argc)       /* advance to next argument */
307        usage();
308      if (keymatch(argv[argn], "90", 2))
309        select_transform(JXFORM_ROT_90);
310      else if (keymatch(argv[argn], "180", 3))
311        select_transform(JXFORM_ROT_180);
312      else if (keymatch(argv[argn], "270", 3))
313        select_transform(JXFORM_ROT_270);
314      else
315        usage();
316
317    } else if (keymatch(arg, "scans", 1)) {
318      /* Set scan script. */
319#ifdef C_MULTISCAN_FILES_SUPPORTED
320      if (++argn >= argc)       /* advance to next argument */
321        usage();
322      scansarg = argv[argn];
323      /* We must postpone reading the file in case -progressive appears. */
324#else
325      fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
326              progname);
327      exit(EXIT_FAILURE);
328#endif
329
330    } else if (keymatch(arg, "transpose", 1)) {
331      /* Transpose (across UL-to-LR axis). */
332      select_transform(JXFORM_TRANSPOSE);
333
334    } else if (keymatch(arg, "transverse", 6)) {
335      /* Transverse transpose (across UR-to-LL axis). */
336      select_transform(JXFORM_TRANSVERSE);
337
338    } else if (keymatch(arg, "trim", 3)) {
339      /* Trim off any partial edge MCUs that the transform can't handle. */
340      transformoption.trim = TRUE;
341
342    } else {
343      usage();                  /* bogus switch */
344    }
345  }
346
347  /* Post-switch-scanning cleanup */
348
349  if (for_real) {
350
351#ifdef C_PROGRESSIVE_SUPPORTED
352    if (simple_progressive)     /* process -progressive; -scans can override */
353      jpeg_simple_progression(cinfo);
354#endif
355
356#ifdef C_MULTISCAN_FILES_SUPPORTED
357    if (scansarg != NULL)       /* process -scans if it was present */
358      if (! read_scan_script(cinfo, scansarg))
359        usage();
360#endif
361  }
362
363  return argn;                  /* return index of next arg (file name) */
364}
365
366
367/*
368 * The main program.
369 */
370
371int
372main (int argc, char **argv)
373{
374  struct jpeg_decompress_struct srcinfo;
375  struct jpeg_compress_struct dstinfo;
376  struct jpeg_error_mgr jsrcerr, jdsterr;
377#ifdef PROGRESS_REPORT
378  struct cdjpeg_progress_mgr progress;
379#endif
380  jvirt_barray_ptr * src_coef_arrays;
381  jvirt_barray_ptr * dst_coef_arrays;
382  int file_index;
383  /* We assume all-in-memory processing and can therefore use only a
384   * single file pointer for sequential input and output operation.
385   */
386  FILE * fp;
387
388  /* On Mac, fetch a command line. */
389#ifdef USE_CCOMMAND
390  argc = ccommand(&argv);
391#endif
392
393  progname = argv[0];
394  if (progname == NULL || progname[0] == 0)
395    progname = "jpegtran";      /* in case C library doesn't provide it */
396
397  /* Initialize the JPEG decompression object with default error handling. */
398  srcinfo.err = jpeg_std_error(&jsrcerr);
399  jpeg_create_decompress(&srcinfo);
400  /* Initialize the JPEG compression object with default error handling. */
401  dstinfo.err = jpeg_std_error(&jdsterr);
402  jpeg_create_compress(&dstinfo);
403
404  /* Scan command line to find file names.
405   * It is convenient to use just one switch-parsing routine, but the switch
406   * values read here are mostly ignored; we will rescan the switches after
407   * opening the input file.  Also note that most of the switches affect the
408   * destination JPEG object, so we parse into that and then copy over what
409   * needs to affects the source too.
410   */
411
412  file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);
413  jsrcerr.trace_level = jdsterr.trace_level;
414  srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;
415
416#ifdef TWO_FILE_COMMANDLINE
417  /* Must have either -outfile switch or explicit output file name */
418  if (outfilename == NULL) {
419    if (file_index != argc-2) {
420      fprintf(stderr, "%s: must name one input and one output file\n",
421              progname);
422      usage();
423    }
424    outfilename = argv[file_index+1];
425  } else {
426    if (file_index != argc-1) {
427      fprintf(stderr, "%s: must name one input and one output file\n",
428              progname);
429      usage();
430    }
431  }
432#else
433  /* Unix style: expect zero or one file name */
434  if (file_index < argc-1) {
435    fprintf(stderr, "%s: only one input file\n", progname);
436    usage();
437  }
438#endif /* TWO_FILE_COMMANDLINE */
439
440  /* Open the input file. */
441  if (file_index < argc) {
442    if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) {
443      fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]);
444      exit(EXIT_FAILURE);
445    }
446  } else {
447    /* default input file is stdin */
448    fp = read_stdin();
449  }
450
451#ifdef PROGRESS_REPORT
452  start_progress_monitor((j_common_ptr) &dstinfo, &progress);
453#endif
454
455  /* Specify data source for decompression */
456  jpeg_stdio_src(&srcinfo, fp);
457
458  /* Enable saving of extra markers that we want to copy */
459  jcopy_markers_setup(&srcinfo, copyoption);
460
461  /* Read file header */
462  (void) jpeg_read_header(&srcinfo, TRUE);
463
464  /* Any space needed by a transform option must be requested before
465   * jpeg_read_coefficients so that memory allocation will be done right.
466   */
467#if TRANSFORMS_SUPPORTED
468  /* Fail right away if -perfect is given and transformation is not perfect.
469   */
470  if (!jtransform_request_workspace(&srcinfo, &transformoption)) {
471    fprintf(stderr, "%s: transformation is not perfect\n", progname);
472    exit(EXIT_FAILURE);
473  }
474#endif
475
476  /* Read source file as DCT coefficients */
477  src_coef_arrays = jpeg_read_coefficients(&srcinfo);
478
479  /* Initialize destination compression parameters from source values */
480  jpeg_copy_critical_parameters(&srcinfo, &dstinfo);
481
482  /* Adjust destination parameters if required by transform options;
483   * also find out which set of coefficient arrays will hold the output.
484   */
485#if TRANSFORMS_SUPPORTED
486  dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,
487                                                 src_coef_arrays,
488                                                 &transformoption);
489#else
490  dst_coef_arrays = src_coef_arrays;
491#endif
492
493  /* Close input file, if we opened it.
494   * Note: we assume that jpeg_read_coefficients consumed all input
495   * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will
496   * only consume more while (! cinfo->inputctl->eoi_reached).
497   * We cannot call jpeg_finish_decompress here since we still need the
498   * virtual arrays allocated from the source object for processing.
499   */
500  if (fp != stdin)
501    fclose(fp);
502
503  /* Open the output file. */
504  if (outfilename != NULL) {
505    if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) {
506      fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename);
507      exit(EXIT_FAILURE);
508    }
509  } else {
510    /* default output file is stdout */
511    fp = write_stdout();
512  }
513
514  /* Adjust default compression parameters by re-parsing the options */
515  file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);
516
517  /* Specify data destination for compression */
518  jpeg_stdio_dest(&dstinfo, fp);
519
520  /* Start compressor (note no image data is actually written here) */
521  jpeg_write_coefficients(&dstinfo, dst_coef_arrays);
522
523  /* Copy to the output file any extra markers that we want to preserve */
524  jcopy_markers_execute(&srcinfo, &dstinfo, copyoption);
525
526  /* Execute image transformation, if any */
527#if TRANSFORMS_SUPPORTED
528  jtransform_execute_transformation(&srcinfo, &dstinfo,
529                                    src_coef_arrays,
530                                    &transformoption);
531#endif
532
533  /* Finish compression and release memory */
534  jpeg_finish_compress(&dstinfo);
535  jpeg_destroy_compress(&dstinfo);
536  (void) jpeg_finish_decompress(&srcinfo);
537  jpeg_destroy_decompress(&srcinfo);
538
539  /* Close output file, if we opened it */
540  if (fp != stdout)
541    fclose(fp);
542
543#ifdef PROGRESS_REPORT
544  end_progress_monitor((j_common_ptr) &dstinfo);
545#endif
546
547  /* All done. */
548  exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);
549  return 0;                     /* suppress no-return-value warnings */
550}
551