source: trunk/libjpeg/djpeg.c @ 15

Last change on this file since 15 was 15, checked in by Eugene Romanenko, 15 years ago

needed libs update

File size: 19.5 KB
Line 
1/*
2 * djpeg.c
3 *
4 * Copyright (C) 1991-1997, 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 the JPEG decompressor.
9 * It should work on any system with Unix- or MS-DOS-style command lines.
10 *
11 * Two different command line styles are permitted, depending on the
12 * compile-time switch TWO_FILE_COMMANDLINE:
13 *      djpeg [options]  inputfile outputfile
14 *      djpeg [options]  [inputfile]
15 * In the second style, output is always to standard output, which you'd
16 * normally redirect to a file or pipe to some other program.  Input is
17 * either from a named file or from standard input (typically redirected).
18 * The second style is convenient on Unix but is unhelpful on systems that
19 * don't support pipes.  Also, you MUST use the first style if your system
20 * doesn't do binary I/O to stdin/stdout.
21 * To simplify script writing, the "-outfile" switch is provided.  The syntax
22 *      djpeg [options]  -outfile outputfile  inputfile
23 * works regardless of which command line style is used.
24 */
25
26#include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
27#include "jversion.h"           /* for version message */
28
29#include <ctype.h>              /* to declare isprint() */
30
31#ifdef USE_CCOMMAND             /* command-line reader for Macintosh */
32#ifdef __MWERKS__
33#include <SIOUX.h>              /* Metrowerks needs this */
34#include <console.h>            /* ... and this */
35#endif
36#ifdef THINK_C
37#include <console.h>            /* Think declares it here */
38#endif
39#endif
40
41
42/* Create the add-on message string table. */
43
44#define JMESSAGE(code,string)   string ,
45
46static const char * const cdjpeg_message_table[] = {
47#include "cderror.h"
48  NULL
49};
50
51
52/*
53 * This list defines the known output image formats
54 * (not all of which need be supported by a given version).
55 * You can change the default output format by defining DEFAULT_FMT;
56 * indeed, you had better do so if you undefine PPM_SUPPORTED.
57 */
58
59typedef enum {
60        FMT_BMP,                /* BMP format (Windows flavor) */
61        FMT_GIF,                /* GIF format */
62        FMT_OS2,                /* BMP format (OS/2 flavor) */
63        FMT_PPM,                /* PPM/PGM (PBMPLUS formats) */
64        FMT_RLE,                /* RLE format */
65        FMT_TARGA,              /* Targa format */
66        FMT_TIFF                /* TIFF format */
67} IMAGE_FORMATS;
68
69#ifndef DEFAULT_FMT             /* so can override from CFLAGS in Makefile */
70#define DEFAULT_FMT     FMT_PPM
71#endif
72
73static IMAGE_FORMATS requested_fmt;
74
75
76/*
77 * Argument-parsing code.
78 * The switch parser is designed to be useful with DOS-style command line
79 * syntax, ie, intermixed switches and file names, where only the switches
80 * to the left of a given file name affect processing of that file.
81 * The main program in this file doesn't actually use this capability...
82 */
83
84
85static const char * progname;   /* program name for error messages */
86static char * outfilename;      /* for -outfile switch */
87
88
89LOCAL(void)
90usage (void)
91/* complain about bad command line */
92{
93  fprintf(stderr, "usage: %s [switches] ", progname);
94#ifdef TWO_FILE_COMMANDLINE
95  fprintf(stderr, "inputfile outputfile\n");
96#else
97  fprintf(stderr, "[inputfile]\n");
98#endif
99
100  fprintf(stderr, "Switches (names may be abbreviated):\n");
101  fprintf(stderr, "  -colors N      Reduce image to no more than N colors\n");
102  fprintf(stderr, "  -fast          Fast, low-quality processing\n");
103  fprintf(stderr, "  -grayscale     Force grayscale output\n");
104#ifdef IDCT_SCALING_SUPPORTED
105  fprintf(stderr, "  -scale M/N     Scale output image by fraction M/N, eg, 1/8\n");
106#endif
107#ifdef BMP_SUPPORTED
108  fprintf(stderr, "  -bmp           Select BMP output format (Windows style)%s\n",
109          (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
110#endif
111#ifdef GIF_SUPPORTED
112  fprintf(stderr, "  -gif           Select GIF output format%s\n",
113          (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
114#endif
115#ifdef BMP_SUPPORTED
116  fprintf(stderr, "  -os2           Select BMP output format (OS/2 style)%s\n",
117          (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
118#endif
119#ifdef PPM_SUPPORTED
120  fprintf(stderr, "  -pnm           Select PBMPLUS (PPM/PGM) output format%s\n",
121          (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
122#endif
123#ifdef RLE_SUPPORTED
124  fprintf(stderr, "  -rle           Select Utah RLE output format%s\n",
125          (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
126#endif
127#ifdef TARGA_SUPPORTED
128  fprintf(stderr, "  -targa         Select Targa output format%s\n",
129          (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
130#endif
131  fprintf(stderr, "Switches for advanced users:\n");
132#ifdef DCT_ISLOW_SUPPORTED
133  fprintf(stderr, "  -dct int       Use integer DCT method%s\n",
134          (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
135#endif
136#ifdef DCT_IFAST_SUPPORTED
137  fprintf(stderr, "  -dct fast      Use fast integer DCT (less accurate)%s\n",
138          (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
139#endif
140#ifdef DCT_FLOAT_SUPPORTED
141  fprintf(stderr, "  -dct float     Use floating-point DCT method%s\n",
142          (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
143#endif
144  fprintf(stderr, "  -dither fs     Use F-S dithering (default)\n");
145  fprintf(stderr, "  -dither none   Don't use dithering in quantization\n");
146  fprintf(stderr, "  -dither ordered  Use ordered dither (medium speed, quality)\n");
147#ifdef QUANT_2PASS_SUPPORTED
148  fprintf(stderr, "  -map FILE      Map to colors used in named image file\n");
149#endif
150  fprintf(stderr, "  -nosmooth      Don't use high-quality upsampling\n");
151#ifdef QUANT_1PASS_SUPPORTED
152  fprintf(stderr, "  -onepass       Use 1-pass quantization (fast, low quality)\n");
153#endif
154  fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
155  fprintf(stderr, "  -outfile name  Specify name for output file\n");
156  fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
157  exit(EXIT_FAILURE);
158}
159
160
161LOCAL(int)
162parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
163                int last_file_arg_seen, boolean for_real)
164/* Parse optional switches.
165 * Returns argv[] index of first file-name argument (== argc if none).
166 * Any file names with indexes <= last_file_arg_seen are ignored;
167 * they have presumably been processed in a previous iteration.
168 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
169 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
170 * processing.
171 */
172{
173  int argn;
174  char * arg;
175
176  /* Set up default JPEG parameters. */
177  requested_fmt = DEFAULT_FMT;  /* set default output file format */
178  outfilename = NULL;
179  cinfo->err->trace_level = 0;
180
181  /* Scan command line options, adjust parameters */
182
183  for (argn = 1; argn < argc; argn++) {
184    arg = argv[argn];
185    if (*arg != '-') {
186      /* Not a switch, must be a file name argument */
187      if (argn <= last_file_arg_seen) {
188        outfilename = NULL;     /* -outfile applies to just one input file */
189        continue;               /* ignore this name if previously processed */
190      }
191      break;                    /* else done parsing switches */
192    }
193    arg++;                      /* advance past switch marker character */
194
195    if (keymatch(arg, "bmp", 1)) {
196      /* BMP output format. */
197      requested_fmt = FMT_BMP;
198
199    } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
200               keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
201      /* Do color quantization. */
202      int val;
203
204      if (++argn >= argc)       /* advance to next argument */
205        usage();
206      if (sscanf(argv[argn], "%d", &val) != 1)
207        usage();
208      cinfo->desired_number_of_colors = val;
209      cinfo->quantize_colors = TRUE;
210
211    } else if (keymatch(arg, "dct", 2)) {
212      /* Select IDCT algorithm. */
213      if (++argn >= argc)       /* advance to next argument */
214        usage();
215      if (keymatch(argv[argn], "int", 1)) {
216        cinfo->dct_method = JDCT_ISLOW;
217      } else if (keymatch(argv[argn], "fast", 2)) {
218        cinfo->dct_method = JDCT_IFAST;
219      } else if (keymatch(argv[argn], "float", 2)) {
220        cinfo->dct_method = JDCT_FLOAT;
221      } else
222        usage();
223
224    } else if (keymatch(arg, "dither", 2)) {
225      /* Select dithering algorithm. */
226      if (++argn >= argc)       /* advance to next argument */
227        usage();
228      if (keymatch(argv[argn], "fs", 2)) {
229        cinfo->dither_mode = JDITHER_FS;
230      } else if (keymatch(argv[argn], "none", 2)) {
231        cinfo->dither_mode = JDITHER_NONE;
232      } else if (keymatch(argv[argn], "ordered", 2)) {
233        cinfo->dither_mode = JDITHER_ORDERED;
234      } else
235        usage();
236
237    } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
238      /* Enable debug printouts. */
239      /* On first -d, print version identification */
240      static boolean printed_version = FALSE;
241
242      if (! printed_version) {
243        fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",
244                JVERSION, JCOPYRIGHT);
245        printed_version = TRUE;
246      }
247      cinfo->err->trace_level++;
248
249    } else if (keymatch(arg, "fast", 1)) {
250      /* Select recommended processing options for quick-and-dirty output. */
251      cinfo->two_pass_quantize = FALSE;
252      cinfo->dither_mode = JDITHER_ORDERED;
253      if (! cinfo->quantize_colors) /* don't override an earlier -colors */
254        cinfo->desired_number_of_colors = 216;
255      cinfo->dct_method = JDCT_FASTEST;
256      cinfo->do_fancy_upsampling = FALSE;
257
258    } else if (keymatch(arg, "gif", 1)) {
259      /* GIF output format. */
260      requested_fmt = FMT_GIF;
261
262    } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
263      /* Force monochrome output. */
264      cinfo->out_color_space = JCS_GRAYSCALE;
265
266    } else if (keymatch(arg, "map", 3)) {
267      /* Quantize to a color map taken from an input file. */
268      if (++argn >= argc)       /* advance to next argument */
269        usage();
270      if (for_real) {           /* too expensive to do twice! */
271#ifdef QUANT_2PASS_SUPPORTED    /* otherwise can't quantize to supplied map */
272        FILE * mapfile;
273
274        if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
275          fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
276          exit(EXIT_FAILURE);
277        }
278        read_color_map(cinfo, mapfile);
279        fclose(mapfile);
280        cinfo->quantize_colors = TRUE;
281#else
282        ERREXIT(cinfo, JERR_NOT_COMPILED);
283#endif
284      }
285
286    } else if (keymatch(arg, "maxmemory", 3)) {
287      /* Maximum memory in Kb (or Mb with 'm'). */
288      long lval;
289      char ch = 'x';
290
291      if (++argn >= argc)       /* advance to next argument */
292        usage();
293      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
294        usage();
295      if (ch == 'm' || ch == 'M')
296        lval *= 1000L;
297      cinfo->mem->max_memory_to_use = lval * 1000L;
298
299    } else if (keymatch(arg, "nosmooth", 3)) {
300      /* Suppress fancy upsampling */
301      cinfo->do_fancy_upsampling = FALSE;
302
303    } else if (keymatch(arg, "onepass", 3)) {
304      /* Use fast one-pass quantization. */
305      cinfo->two_pass_quantize = FALSE;
306
307    } else if (keymatch(arg, "os2", 3)) {
308      /* BMP output format (OS/2 flavor). */
309      requested_fmt = FMT_OS2;
310
311    } else if (keymatch(arg, "outfile", 4)) {
312      /* Set output file name. */
313      if (++argn >= argc)       /* advance to next argument */
314        usage();
315      outfilename = argv[argn]; /* save it away for later use */
316
317    } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
318      /* PPM/PGM output format. */
319      requested_fmt = FMT_PPM;
320
321    } else if (keymatch(arg, "rle", 1)) {
322      /* RLE output format. */
323      requested_fmt = FMT_RLE;
324
325    } else if (keymatch(arg, "scale", 1)) {
326      /* Scale the output image by a fraction M/N. */
327      if (++argn >= argc)       /* advance to next argument */
328        usage();
329      if (sscanf(argv[argn], "%d/%d",
330                 &cinfo->scale_num, &cinfo->scale_denom) != 2)
331        usage();
332
333    } else if (keymatch(arg, "targa", 1)) {
334      /* Targa output format. */
335      requested_fmt = FMT_TARGA;
336
337    } else {
338      usage();                  /* bogus switch */
339    }
340  }
341
342  return argn;                  /* return index of next arg (file name) */
343}
344
345
346/*
347 * Marker processor for COM and interesting APPn markers.
348 * This replaces the library's built-in processor, which just skips the marker.
349 * We want to print out the marker as text, to the extent possible.
350 * Note this code relies on a non-suspending data source.
351 */
352
353LOCAL(unsigned int)
354jpeg_getc (j_decompress_ptr cinfo)
355/* Read next byte */
356{
357  struct jpeg_source_mgr * datasrc = cinfo->src;
358
359  if (datasrc->bytes_in_buffer == 0) {
360    if (! (*datasrc->fill_input_buffer) (cinfo))
361      ERREXIT(cinfo, JERR_CANT_SUSPEND);
362  }
363  datasrc->bytes_in_buffer--;
364  return GETJOCTET(*datasrc->next_input_byte++);
365}
366
367
368METHODDEF(boolean)
369print_text_marker (j_decompress_ptr cinfo)
370{
371  boolean traceit = (cinfo->err->trace_level >= 1);
372  INT32 length;
373  unsigned int ch;
374  unsigned int lastch = 0;
375
376  length = jpeg_getc(cinfo) << 8;
377  length += jpeg_getc(cinfo);
378  length -= 2;                  /* discount the length word itself */
379
380  if (traceit) {
381    if (cinfo->unread_marker == JPEG_COM)
382      fprintf(stderr, "Comment, length %ld:\n", (long) length);
383    else                        /* assume it is an APPn otherwise */
384      fprintf(stderr, "APP%d, length %ld:\n",
385              cinfo->unread_marker - JPEG_APP0, (long) length);
386  }
387
388  while (--length >= 0) {
389    ch = jpeg_getc(cinfo);
390    if (traceit) {
391      /* Emit the character in a readable form.
392       * Nonprintables are converted to \nnn form,
393       * while \ is converted to \\.
394       * Newlines in CR, CR/LF, or LF form will be printed as one newline.
395       */
396      if (ch == '\r') {
397        fprintf(stderr, "\n");
398      } else if (ch == '\n') {
399        if (lastch != '\r')
400          fprintf(stderr, "\n");
401      } else if (ch == '\\') {
402        fprintf(stderr, "\\\\");
403      } else if (isprint(ch)) {
404        putc(ch, stderr);
405      } else {
406        fprintf(stderr, "\\%03o", ch);
407      }
408      lastch = ch;
409    }
410  }
411
412  if (traceit)
413    fprintf(stderr, "\n");
414
415  return TRUE;
416}
417
418
419/*
420 * The main program.
421 */
422
423int
424main (int argc, char **argv)
425{
426  struct jpeg_decompress_struct cinfo;
427  struct jpeg_error_mgr jerr;
428#ifdef PROGRESS_REPORT
429  struct cdjpeg_progress_mgr progress;
430#endif
431  int file_index;
432  djpeg_dest_ptr dest_mgr = NULL;
433  FILE * input_file;
434  FILE * output_file;
435  JDIMENSION num_scanlines;
436
437  /* On Mac, fetch a command line. */
438#ifdef USE_CCOMMAND
439  argc = ccommand(&argv);
440#endif
441
442  progname = argv[0];
443  if (progname == NULL || progname[0] == 0)
444    progname = "djpeg";         /* in case C library doesn't provide it */
445
446  /* Initialize the JPEG decompression object with default error handling. */
447  cinfo.err = jpeg_std_error(&jerr);
448  jpeg_create_decompress(&cinfo);
449  /* Add some application-specific error messages (from cderror.h) */
450  jerr.addon_message_table = cdjpeg_message_table;
451  jerr.first_addon_message = JMSG_FIRSTADDONCODE;
452  jerr.last_addon_message = JMSG_LASTADDONCODE;
453
454  /* Insert custom marker processor for COM and APP12.
455   * APP12 is used by some digital camera makers for textual info,
456   * so we provide the ability to display it as text.
457   * If you like, additional APPn marker types can be selected for display,
458   * but don't try to override APP0 or APP14 this way (see libjpeg.doc).
459   */
460  jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
461  jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);
462
463  /* Now safe to enable signal catcher. */
464#ifdef NEED_SIGNAL_CATCHER
465  enable_signal_catcher((j_common_ptr) &cinfo);
466#endif
467
468  /* Scan command line to find file names. */
469  /* It is convenient to use just one switch-parsing routine, but the switch
470   * values read here are ignored; we will rescan the switches after opening
471   * the input file.
472   * (Exception: tracing level set here controls verbosity for COM markers
473   * found during jpeg_read_header...)
474   */
475
476  file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
477
478#ifdef TWO_FILE_COMMANDLINE
479  /* Must have either -outfile switch or explicit output file name */
480  if (outfilename == NULL) {
481    if (file_index != argc-2) {
482      fprintf(stderr, "%s: must name one input and one output file\n",
483              progname);
484      usage();
485    }
486    outfilename = argv[file_index+1];
487  } else {
488    if (file_index != argc-1) {
489      fprintf(stderr, "%s: must name one input and one output file\n",
490              progname);
491      usage();
492    }
493  }
494#else
495  /* Unix style: expect zero or one file name */
496  if (file_index < argc-1) {
497    fprintf(stderr, "%s: only one input file\n", progname);
498    usage();
499  }
500#endif /* TWO_FILE_COMMANDLINE */
501
502  /* Open the input file. */
503  if (file_index < argc) {
504    if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
505      fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
506      exit(EXIT_FAILURE);
507    }
508  } else {
509    /* default input file is stdin */
510    input_file = read_stdin();
511  }
512
513  /* Open the output file. */
514  if (outfilename != NULL) {
515    if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
516      fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
517      exit(EXIT_FAILURE);
518    }
519  } else {
520    /* default output file is stdout */
521    output_file = write_stdout();
522  }
523
524#ifdef PROGRESS_REPORT
525  start_progress_monitor((j_common_ptr) &cinfo, &progress);
526#endif
527
528  /* Specify data source for decompression */
529  jpeg_stdio_src(&cinfo, input_file);
530
531  /* Read file header, set default decompression parameters */
532  (void) jpeg_read_header(&cinfo, TRUE);
533
534  /* Adjust default decompression parameters by re-parsing the options */
535  file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
536
537  /* Initialize the output module now to let it override any crucial
538   * option settings (for instance, GIF wants to force color quantization).
539   */
540  switch (requested_fmt) {
541#ifdef BMP_SUPPORTED
542  case FMT_BMP:
543    dest_mgr = jinit_write_bmp(&cinfo, FALSE);
544    break;
545  case FMT_OS2:
546    dest_mgr = jinit_write_bmp(&cinfo, TRUE);
547    break;
548#endif
549#ifdef GIF_SUPPORTED
550  case FMT_GIF:
551    dest_mgr = jinit_write_gif(&cinfo);
552    break;
553#endif
554#ifdef PPM_SUPPORTED
555  case FMT_PPM:
556    dest_mgr = jinit_write_ppm(&cinfo);
557    break;
558#endif
559#ifdef RLE_SUPPORTED
560  case FMT_RLE:
561    dest_mgr = jinit_write_rle(&cinfo);
562    break;
563#endif
564#ifdef TARGA_SUPPORTED
565  case FMT_TARGA:
566    dest_mgr = jinit_write_targa(&cinfo);
567    break;
568#endif
569  default:
570    ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
571    break;
572  }
573  dest_mgr->output_file = output_file;
574
575  /* Start decompressor */
576  (void) jpeg_start_decompress(&cinfo);
577
578  /* Write output file header */
579  (*dest_mgr->start_output) (&cinfo, dest_mgr);
580
581  /* Process data */
582  while (cinfo.output_scanline < cinfo.output_height) {
583    num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
584                                        dest_mgr->buffer_height);
585    (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
586  }
587
588#ifdef PROGRESS_REPORT
589  /* Hack: count final pass as done in case finish_output does an extra pass.
590   * The library won't have updated completed_passes.
591   */
592  progress.pub.completed_passes = progress.pub.total_passes;
593#endif
594
595  /* Finish decompression and release memory.
596   * I must do it in this order because output module has allocated memory
597   * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
598   */
599  (*dest_mgr->finish_output) (&cinfo, dest_mgr);
600  (void) jpeg_finish_decompress(&cinfo);
601  jpeg_destroy_decompress(&cinfo);
602
603  /* Close files, if we opened them */
604  if (input_file != stdin)
605    fclose(input_file);
606  if (output_file != stdout)
607    fclose(output_file);
608
609#ifdef PROGRESS_REPORT
610  end_progress_monitor((j_common_ptr) &cinfo);
611#endif
612
613  /* All done. */
614  exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
615  return 0;                     /* suppress no-return-value warnings */
616}
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