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/src/FreeImage/Source/LibJPEG/djpeg.c

https://bitbucket.org/cabalistic/ogredeps/
C | 617 lines | 478 code | 57 blank | 82 comment | 102 complexity | 222a725c2bfcf616dc49e0de11b6c6aa MD5 | raw file
  1/*
  2 * djpeg.c
  3 *
  4 * Copyright (C) 1991-1997, Thomas G. Lane.
  5 * Modified 2009 by Guido Vollbeding.
  6 * This file is part of the Independent JPEG Group's software.
  7 * For conditions of distribution and use, see the accompanying README file.
  8 *
  9 * This file contains a command-line user interface for the JPEG decompressor.
 10 * It should work on any system with Unix- or MS-DOS-style command lines.
 11 *
 12 * Two different command line styles are permitted, depending on the
 13 * compile-time switch TWO_FILE_COMMANDLINE:
 14 *	djpeg [options]  inputfile outputfile
 15 *	djpeg [options]  [inputfile]
 16 * In the second style, output is always to standard output, which you'd
 17 * normally redirect to a file or pipe to some other program.  Input is
 18 * either from a named file or from standard input (typically redirected).
 19 * The second style is convenient on Unix but is unhelpful on systems that
 20 * don't support pipes.  Also, you MUST use the first style if your system
 21 * doesn't do binary I/O to stdin/stdout.
 22 * To simplify script writing, the "-outfile" switch is provided.  The syntax
 23 *	djpeg [options]  -outfile outputfile  inputfile
 24 * works regardless of which command line style is used.
 25 */
 26
 27#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
 28#include "jversion.h"		/* for version message */
 29
 30#include <ctype.h>		/* to declare isprint() */
 31
 32#ifdef USE_CCOMMAND		/* command-line reader for Macintosh */
 33#ifdef __MWERKS__
 34#include <SIOUX.h>              /* Metrowerks needs this */
 35#include <console.h>		/* ... and this */
 36#endif
 37#ifdef THINK_C
 38#include <console.h>		/* Think declares it here */
 39#endif
 40#endif
 41
 42
 43/* Create the add-on message string table. */
 44
 45#define JMESSAGE(code,string)	string ,
 46
 47static const char * const cdjpeg_message_table[] = {
 48#include "cderror.h"
 49  NULL
 50};
 51
 52
 53/*
 54 * This list defines the known output image formats
 55 * (not all of which need be supported by a given version).
 56 * You can change the default output format by defining DEFAULT_FMT;
 57 * indeed, you had better do so if you undefine PPM_SUPPORTED.
 58 */
 59
 60typedef enum {
 61	FMT_BMP,		/* BMP format (Windows flavor) */
 62	FMT_GIF,		/* GIF format */
 63	FMT_OS2,		/* BMP format (OS/2 flavor) */
 64	FMT_PPM,		/* PPM/PGM (PBMPLUS formats) */
 65	FMT_RLE,		/* RLE format */
 66	FMT_TARGA,		/* Targa format */
 67	FMT_TIFF		/* TIFF format */
 68} IMAGE_FORMATS;
 69
 70#ifndef DEFAULT_FMT		/* so can override from CFLAGS in Makefile */
 71#define DEFAULT_FMT	FMT_PPM
 72#endif
 73
 74static IMAGE_FORMATS requested_fmt;
 75
 76
 77/*
 78 * Argument-parsing code.
 79 * The switch parser is designed to be useful with DOS-style command line
 80 * syntax, ie, intermixed switches and file names, where only the switches
 81 * to the left of a given file name affect processing of that file.
 82 * The main program in this file doesn't actually use this capability...
 83 */
 84
 85
 86static const char * progname;	/* program name for error messages */
 87static char * outfilename;	/* for -outfile switch */
 88
 89
 90LOCAL(void)
 91usage (void)
 92/* complain about bad command line */
 93{
 94  fprintf(stderr, "usage: %s [switches] ", progname);
 95#ifdef TWO_FILE_COMMANDLINE
 96  fprintf(stderr, "inputfile outputfile\n");
 97#else
 98  fprintf(stderr, "[inputfile]\n");
 99#endif
100
101  fprintf(stderr, "Switches (names may be abbreviated):\n");
102  fprintf(stderr, "  -colors N      Reduce image to no more than N colors\n");
103  fprintf(stderr, "  -fast          Fast, low-quality processing\n");
104  fprintf(stderr, "  -grayscale     Force grayscale output\n");
105#ifdef IDCT_SCALING_SUPPORTED
106  fprintf(stderr, "  -scale M/N     Scale output image by fraction M/N, eg, 1/8\n");
107#endif
108#ifdef BMP_SUPPORTED
109  fprintf(stderr, "  -bmp           Select BMP output format (Windows style)%s\n",
110	  (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
111#endif
112#ifdef GIF_SUPPORTED
113  fprintf(stderr, "  -gif           Select GIF output format%s\n",
114	  (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
115#endif
116#ifdef BMP_SUPPORTED
117  fprintf(stderr, "  -os2           Select BMP output format (OS/2 style)%s\n",
118	  (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
119#endif
120#ifdef PPM_SUPPORTED
121  fprintf(stderr, "  -pnm           Select PBMPLUS (PPM/PGM) output format%s\n",
122	  (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
123#endif
124#ifdef RLE_SUPPORTED
125  fprintf(stderr, "  -rle           Select Utah RLE output format%s\n",
126	  (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
127#endif
128#ifdef TARGA_SUPPORTED
129  fprintf(stderr, "  -targa         Select Targa output format%s\n",
130	  (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
131#endif
132  fprintf(stderr, "Switches for advanced users:\n");
133#ifdef DCT_ISLOW_SUPPORTED
134  fprintf(stderr, "  -dct int       Use integer DCT method%s\n",
135	  (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
136#endif
137#ifdef DCT_IFAST_SUPPORTED
138  fprintf(stderr, "  -dct fast      Use fast integer DCT (less accurate)%s\n",
139	  (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
140#endif
141#ifdef DCT_FLOAT_SUPPORTED
142  fprintf(stderr, "  -dct float     Use floating-point DCT method%s\n",
143	  (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
144#endif
145  fprintf(stderr, "  -dither fs     Use F-S dithering (default)\n");
146  fprintf(stderr, "  -dither none   Don't use dithering in quantization\n");
147  fprintf(stderr, "  -dither ordered  Use ordered dither (medium speed, quality)\n");
148#ifdef QUANT_2PASS_SUPPORTED
149  fprintf(stderr, "  -map FILE      Map to colors used in named image file\n");
150#endif
151  fprintf(stderr, "  -nosmooth      Don't use high-quality upsampling\n");
152#ifdef QUANT_1PASS_SUPPORTED
153  fprintf(stderr, "  -onepass       Use 1-pass quantization (fast, low quality)\n");
154#endif
155  fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
156  fprintf(stderr, "  -outfile name  Specify name for output file\n");
157  fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
158  exit(EXIT_FAILURE);
159}
160
161
162LOCAL(int)
163parse_switches (j_decompress_ptr cinfo, int argc, char **argv,
164		int last_file_arg_seen, boolean for_real)
165/* Parse optional switches.
166 * Returns argv[] index of first file-name argument (== argc if none).
167 * Any file names with indexes <= last_file_arg_seen are ignored;
168 * they have presumably been processed in a previous iteration.
169 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
170 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
171 * processing.
172 */
173{
174  int argn;
175  char * arg;
176
177  /* Set up default JPEG parameters. */
178  requested_fmt = DEFAULT_FMT;	/* set default output file format */
179  outfilename = NULL;
180  cinfo->err->trace_level = 0;
181
182  /* Scan command line options, adjust parameters */
183
184  for (argn = 1; argn < argc; argn++) {
185    arg = argv[argn];
186    if (*arg != '-') {
187      /* Not a switch, must be a file name argument */
188      if (argn <= last_file_arg_seen) {
189	outfilename = NULL;	/* -outfile applies to just one input file */
190	continue;		/* ignore this name if previously processed */
191      }
192      break;			/* else done parsing switches */
193    }
194    arg++;			/* advance past switch marker character */
195
196    if (keymatch(arg, "bmp", 1)) {
197      /* BMP output format. */
198      requested_fmt = FMT_BMP;
199
200    } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
201	       keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
202      /* Do color quantization. */
203      int val;
204
205      if (++argn >= argc)	/* advance to next argument */
206	usage();
207      if (sscanf(argv[argn], "%d", &val) != 1)
208	usage();
209      cinfo->desired_number_of_colors = val;
210      cinfo->quantize_colors = TRUE;
211
212    } else if (keymatch(arg, "dct", 2)) {
213      /* Select IDCT algorithm. */
214      if (++argn >= argc)	/* advance to next argument */
215	usage();
216      if (keymatch(argv[argn], "int", 1)) {
217	cinfo->dct_method = JDCT_ISLOW;
218      } else if (keymatch(argv[argn], "fast", 2)) {
219	cinfo->dct_method = JDCT_IFAST;
220      } else if (keymatch(argv[argn], "float", 2)) {
221	cinfo->dct_method = JDCT_FLOAT;
222      } else
223	usage();
224
225    } else if (keymatch(arg, "dither", 2)) {
226      /* Select dithering algorithm. */
227      if (++argn >= argc)	/* advance to next argument */
228	usage();
229      if (keymatch(argv[argn], "fs", 2)) {
230	cinfo->dither_mode = JDITHER_FS;
231      } else if (keymatch(argv[argn], "none", 2)) {
232	cinfo->dither_mode = JDITHER_NONE;
233      } else if (keymatch(argv[argn], "ordered", 2)) {
234	cinfo->dither_mode = JDITHER_ORDERED;
235      } else
236	usage();
237
238    } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
239      /* Enable debug printouts. */
240      /* On first -d, print version identification */
241      static boolean printed_version = FALSE;
242
243      if (! printed_version) {
244	fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",
245		JVERSION, JCOPYRIGHT);
246	printed_version = TRUE;
247      }
248      cinfo->err->trace_level++;
249
250    } else if (keymatch(arg, "fast", 1)) {
251      /* Select recommended processing options for quick-and-dirty output. */
252      cinfo->two_pass_quantize = FALSE;
253      cinfo->dither_mode = JDITHER_ORDERED;
254      if (! cinfo->quantize_colors) /* don't override an earlier -colors */
255	cinfo->desired_number_of_colors = 216;
256      cinfo->dct_method = JDCT_FASTEST;
257      cinfo->do_fancy_upsampling = FALSE;
258
259    } else if (keymatch(arg, "gif", 1)) {
260      /* GIF output format. */
261      requested_fmt = FMT_GIF;
262
263    } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
264      /* Force monochrome output. */
265      cinfo->out_color_space = JCS_GRAYSCALE;
266
267    } else if (keymatch(arg, "map", 3)) {
268      /* Quantize to a color map taken from an input file. */
269      if (++argn >= argc)	/* advance to next argument */
270	usage();
271      if (for_real) {		/* too expensive to do twice! */
272#ifdef QUANT_2PASS_SUPPORTED	/* otherwise can't quantize to supplied map */
273	FILE * mapfile;
274
275	if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
276	  fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
277	  exit(EXIT_FAILURE);
278	}
279	read_color_map(cinfo, mapfile);
280	fclose(mapfile);
281	cinfo->quantize_colors = TRUE;
282#else
283	ERREXIT(cinfo, JERR_NOT_COMPILED);
284#endif
285      }
286
287    } else if (keymatch(arg, "maxmemory", 3)) {
288      /* Maximum memory in Kb (or Mb with 'm'). */
289      long lval;
290      char ch = 'x';
291
292      if (++argn >= argc)	/* advance to next argument */
293	usage();
294      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
295	usage();
296      if (ch == 'm' || ch == 'M')
297	lval *= 1000L;
298      cinfo->mem->max_memory_to_use = lval * 1000L;
299
300    } else if (keymatch(arg, "nosmooth", 3)) {
301      /* Suppress fancy upsampling */
302      cinfo->do_fancy_upsampling = FALSE;
303
304    } else if (keymatch(arg, "onepass", 3)) {
305      /* Use fast one-pass quantization. */
306      cinfo->two_pass_quantize = FALSE;
307
308    } else if (keymatch(arg, "os2", 3)) {
309      /* BMP output format (OS/2 flavor). */
310      requested_fmt = FMT_OS2;
311
312    } else if (keymatch(arg, "outfile", 4)) {
313      /* Set output file name. */
314      if (++argn >= argc)	/* advance to next argument */
315	usage();
316      outfilename = argv[argn];	/* save it away for later use */
317
318    } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
319      /* PPM/PGM output format. */
320      requested_fmt = FMT_PPM;
321
322    } else if (keymatch(arg, "rle", 1)) {
323      /* RLE output format. */
324      requested_fmt = FMT_RLE;
325
326    } else if (keymatch(arg, "scale", 1)) {
327      /* Scale the output image by a fraction M/N. */
328      if (++argn >= argc)	/* advance to next argument */
329	usage();
330      if (sscanf(argv[argn], "%d/%d",
331		 &cinfo->scale_num, &cinfo->scale_denom) < 1)
332	usage();
333
334    } else if (keymatch(arg, "targa", 1)) {
335      /* Targa output format. */
336      requested_fmt = FMT_TARGA;
337
338    } else {
339      usage();			/* bogus switch */
340    }
341  }
342
343  return argn;			/* return index of next arg (file name) */
344}
345
346
347/*
348 * Marker processor for COM and interesting APPn markers.
349 * This replaces the library's built-in processor, which just skips the marker.
350 * We want to print out the marker as text, to the extent possible.
351 * Note this code relies on a non-suspending data source.
352 */
353
354LOCAL(unsigned int)
355jpeg_getc (j_decompress_ptr cinfo)
356/* Read next byte */
357{
358  struct jpeg_source_mgr * datasrc = cinfo->src;
359
360  if (datasrc->bytes_in_buffer == 0) {
361    if (! (*datasrc->fill_input_buffer) (cinfo))
362      ERREXIT(cinfo, JERR_CANT_SUSPEND);
363  }
364  datasrc->bytes_in_buffer--;
365  return GETJOCTET(*datasrc->next_input_byte++);
366}
367
368
369METHODDEF(boolean)
370print_text_marker (j_decompress_ptr cinfo)
371{
372  boolean traceit = (cinfo->err->trace_level >= 1);
373  INT32 length;
374  unsigned int ch;
375  unsigned int lastch = 0;
376
377  length = jpeg_getc(cinfo) << 8;
378  length += jpeg_getc(cinfo);
379  length -= 2;			/* discount the length word itself */
380
381  if (traceit) {
382    if (cinfo->unread_marker == JPEG_COM)
383      fprintf(stderr, "Comment, length %ld:\n", (long) length);
384    else			/* assume it is an APPn otherwise */
385      fprintf(stderr, "APP%d, length %ld:\n",
386	      cinfo->unread_marker - JPEG_APP0, (long) length);
387  }
388
389  while (--length >= 0) {
390    ch = jpeg_getc(cinfo);
391    if (traceit) {
392      /* Emit the character in a readable form.
393       * Nonprintables are converted to \nnn form,
394       * while \ is converted to \\.
395       * Newlines in CR, CR/LF, or LF form will be printed as one newline.
396       */
397      if (ch == '\r') {
398	fprintf(stderr, "\n");
399      } else if (ch == '\n') {
400	if (lastch != '\r')
401	  fprintf(stderr, "\n");
402      } else if (ch == '\\') {
403	fprintf(stderr, "\\\\");
404      } else if (isprint(ch)) {
405	putc(ch, stderr);
406      } else {
407	fprintf(stderr, "\\%03o", ch);
408      }
409      lastch = ch;
410    }
411  }
412
413  if (traceit)
414    fprintf(stderr, "\n");
415
416  return TRUE;
417}
418
419
420/*
421 * The main program.
422 */
423
424int
425main (int argc, char **argv)
426{
427  struct jpeg_decompress_struct cinfo;
428  struct jpeg_error_mgr jerr;
429#ifdef PROGRESS_REPORT
430  struct cdjpeg_progress_mgr progress;
431#endif
432  int file_index;
433  djpeg_dest_ptr dest_mgr = NULL;
434  FILE * input_file;
435  FILE * output_file;
436  JDIMENSION num_scanlines;
437
438  /* On Mac, fetch a command line. */
439#ifdef USE_CCOMMAND
440  argc = ccommand(&argv);
441#endif
442
443  progname = argv[0];
444  if (progname == NULL || progname[0] == 0)
445    progname = "djpeg";		/* in case C library doesn't provide it */
446
447  /* Initialize the JPEG decompression object with default error handling. */
448  cinfo.err = jpeg_std_error(&jerr);
449  jpeg_create_decompress(&cinfo);
450  /* Add some application-specific error messages (from cderror.h) */
451  jerr.addon_message_table = cdjpeg_message_table;
452  jerr.first_addon_message = JMSG_FIRSTADDONCODE;
453  jerr.last_addon_message = JMSG_LASTADDONCODE;
454
455  /* Insert custom marker processor for COM and APP12.
456   * APP12 is used by some digital camera makers for textual info,
457   * so we provide the ability to display it as text.
458   * If you like, additional APPn marker types can be selected for display,
459   * but don't try to override APP0 or APP14 this way (see libjpeg.doc).
460   */
461  jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
462  jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);
463
464  /* Now safe to enable signal catcher. */
465#ifdef NEED_SIGNAL_CATCHER
466  enable_signal_catcher((j_common_ptr) &cinfo);
467#endif
468
469  /* Scan command line to find file names. */
470  /* It is convenient to use just one switch-parsing routine, but the switch
471   * values read here are ignored; we will rescan the switches after opening
472   * the input file.
473   * (Exception: tracing level set here controls verbosity for COM markers
474   * found during jpeg_read_header...)
475   */
476
477  file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
478
479#ifdef TWO_FILE_COMMANDLINE
480  /* Must have either -outfile switch or explicit output file name */
481  if (outfilename == NULL) {
482    if (file_index != argc-2) {
483      fprintf(stderr, "%s: must name one input and one output file\n",
484	      progname);
485      usage();
486    }
487    outfilename = argv[file_index+1];
488  } else {
489    if (file_index != argc-1) {
490      fprintf(stderr, "%s: must name one input and one output file\n",
491	      progname);
492      usage();
493    }
494  }
495#else
496  /* Unix style: expect zero or one file name */
497  if (file_index < argc-1) {
498    fprintf(stderr, "%s: only one input file\n", progname);
499    usage();
500  }
501#endif /* TWO_FILE_COMMANDLINE */
502
503  /* Open the input file. */
504  if (file_index < argc) {
505    if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
506      fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
507      exit(EXIT_FAILURE);
508    }
509  } else {
510    /* default input file is stdin */
511    input_file = read_stdin();
512  }
513
514  /* Open the output file. */
515  if (outfilename != NULL) {
516    if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
517      fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
518      exit(EXIT_FAILURE);
519    }
520  } else {
521    /* default output file is stdout */
522    output_file = write_stdout();
523  }
524
525#ifdef PROGRESS_REPORT
526  start_progress_monitor((j_common_ptr) &cinfo, &progress);
527#endif
528
529  /* Specify data source for decompression */
530  jpeg_stdio_src(&cinfo, input_file);
531
532  /* Read file header, set default decompression parameters */
533  (void) jpeg_read_header(&cinfo, TRUE);
534
535  /* Adjust default decompression parameters by re-parsing the options */
536  file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
537
538  /* Initialize the output module now to let it override any crucial
539   * option settings (for instance, GIF wants to force color quantization).
540   */
541  switch (requested_fmt) {
542#ifdef BMP_SUPPORTED
543  case FMT_BMP:
544    dest_mgr = jinit_write_bmp(&cinfo, FALSE);
545    break;
546  case FMT_OS2:
547    dest_mgr = jinit_write_bmp(&cinfo, TRUE);
548    break;
549#endif
550#ifdef GIF_SUPPORTED
551  case FMT_GIF:
552    dest_mgr = jinit_write_gif(&cinfo);
553    break;
554#endif
555#ifdef PPM_SUPPORTED
556  case FMT_PPM:
557    dest_mgr = jinit_write_ppm(&cinfo);
558    break;
559#endif
560#ifdef RLE_SUPPORTED
561  case FMT_RLE:
562    dest_mgr = jinit_write_rle(&cinfo);
563    break;
564#endif
565#ifdef TARGA_SUPPORTED
566  case FMT_TARGA:
567    dest_mgr = jinit_write_targa(&cinfo);
568    break;
569#endif
570  default:
571    ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
572    break;
573  }
574  dest_mgr->output_file = output_file;
575
576  /* Start decompressor */
577  (void) jpeg_start_decompress(&cinfo);
578
579  /* Write output file header */
580  (*dest_mgr->start_output) (&cinfo, dest_mgr);
581
582  /* Process data */
583  while (cinfo.output_scanline < cinfo.output_height) {
584    num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
585					dest_mgr->buffer_height);
586    (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
587  }
588
589#ifdef PROGRESS_REPORT
590  /* Hack: count final pass as done in case finish_output does an extra pass.
591   * The library won't have updated completed_passes.
592   */
593  progress.pub.completed_passes = progress.pub.total_passes;
594#endif
595
596  /* Finish decompression and release memory.
597   * I must do it in this order because output module has allocated memory
598   * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
599   */
600  (*dest_mgr->finish_output) (&cinfo, dest_mgr);
601  (void) jpeg_finish_decompress(&cinfo);
602  jpeg_destroy_decompress(&cinfo);
603
604  /* Close files, if we opened them */
605  if (input_file != stdin)
606    fclose(input_file);
607  if (output_file != stdout)
608    fclose(output_file);
609
610#ifdef PROGRESS_REPORT
611  end_progress_monitor((j_common_ptr) &cinfo);
612#endif
613
614  /* All done. */
615  exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
616  return 0;			/* suppress no-return-value warnings */
617}