source: trunk/libjpeg/cjpeg.c @ 15

Last change on this file since 15 was 15, checked in by Eugene Romanenko, 16 years ago

needed libs update

File size: 20.0 KB
Line 
1/*
2 * cjpeg.c
3 *
4 * Copyright (C) 1991-1998, 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 compressor.
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 *      cjpeg [options]  inputfile outputfile
14 *      cjpeg [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 *      cjpeg [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#ifdef USE_CCOMMAND             /* command-line reader for Macintosh */
30#ifdef __MWERKS__
31#include <SIOUX.h>              /* Metrowerks needs this */
32#include <console.h>            /* ... and this */
33#endif
34#ifdef THINK_C
35#include <console.h>            /* Think declares it here */
36#endif
37#endif
38
39
40/* Create the add-on message string table. */
41
42#define JMESSAGE(code,string)   string ,
43
44static const char * const cdjpeg_message_table[] = {
45#include "cderror.h"
46  NULL
47};
48
49
50/*
51 * This routine determines what format the input file is,
52 * and selects the appropriate input-reading module.
53 *
54 * To determine which family of input formats the file belongs to,
55 * we may look only at the first byte of the file, since C does not
56 * guarantee that more than one character can be pushed back with ungetc.
57 * Looking at additional bytes would require one of these approaches:
58 *     1) assume we can fseek() the input file (fails for piped input);
59 *     2) assume we can push back more than one character (works in
60 *        some C implementations, but unportable);
61 *     3) provide our own buffering (breaks input readers that want to use
62 *        stdio directly, such as the RLE library);
63 * or  4) don't put back the data, and modify the input_init methods to assume
64 *        they start reading after the start of file (also breaks RLE library).
65 * #1 is attractive for MS-DOS but is untenable on Unix.
66 *
67 * The most portable solution for file types that can't be identified by their
68 * first byte is to make the user tell us what they are.  This is also the
69 * only approach for "raw" file types that contain only arbitrary values.
70 * We presently apply this method for Targa files.  Most of the time Targa
71 * files start with 0x00, so we recognize that case.  Potentially, however,
72 * a Targa file could start with any byte value (byte 0 is the length of the
73 * seldom-used ID field), so we provide a switch to force Targa input mode.
74 */
75
76static boolean is_targa;        /* records user -targa switch */
77
78
79LOCAL(cjpeg_source_ptr)
80select_file_type (j_compress_ptr cinfo, FILE * infile)
81{
82  int c;
83
84  if (is_targa) {
85#ifdef TARGA_SUPPORTED
86    return jinit_read_targa(cinfo);
87#else
88    ERREXIT(cinfo, JERR_TGA_NOTCOMP);
89#endif
90  }
91
92  if ((c = getc(infile)) == EOF)
93    ERREXIT(cinfo, JERR_INPUT_EMPTY);
94  if (ungetc(c, infile) == EOF)
95    ERREXIT(cinfo, JERR_UNGETC_FAILED);
96
97  switch (c) {
98#ifdef BMP_SUPPORTED
99  case 'B':
100    return jinit_read_bmp(cinfo);
101#endif
102#ifdef GIF_SUPPORTED
103  case 'G':
104    return jinit_read_gif(cinfo);
105#endif
106#ifdef PPM_SUPPORTED
107  case 'P':
108    return jinit_read_ppm(cinfo);
109#endif
110#ifdef RLE_SUPPORTED
111  case 'R':
112    return jinit_read_rle(cinfo);
113#endif
114#ifdef TARGA_SUPPORTED
115  case 0x00:
116    return jinit_read_targa(cinfo);
117#endif
118  default:
119    ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
120    break;
121  }
122
123  return NULL;                  /* suppress compiler warnings */
124}
125
126
127/*
128 * Argument-parsing code.
129 * The switch parser is designed to be useful with DOS-style command line
130 * syntax, ie, intermixed switches and file names, where only the switches
131 * to the left of a given file name affect processing of that file.
132 * The main program in this file doesn't actually use this capability...
133 */
134
135
136static const char * progname;   /* program name for error messages */
137static char * outfilename;      /* for -outfile switch */
138
139
140LOCAL(void)
141usage (void)
142/* complain about bad command line */
143{
144  fprintf(stderr, "usage: %s [switches] ", progname);
145#ifdef TWO_FILE_COMMANDLINE
146  fprintf(stderr, "inputfile outputfile\n");
147#else
148  fprintf(stderr, "[inputfile]\n");
149#endif
150
151  fprintf(stderr, "Switches (names may be abbreviated):\n");
152  fprintf(stderr, "  -quality N     Compression quality (0..100; 5-95 is useful range)\n");
153  fprintf(stderr, "  -grayscale     Create monochrome JPEG file\n");
154#ifdef ENTROPY_OPT_SUPPORTED
155  fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
156#endif
157#ifdef C_PROGRESSIVE_SUPPORTED
158  fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
159#endif
160#ifdef TARGA_SUPPORTED
161  fprintf(stderr, "  -targa         Input file is Targa format (usually not needed)\n");
162#endif
163  fprintf(stderr, "Switches for advanced users:\n");
164#ifdef DCT_ISLOW_SUPPORTED
165  fprintf(stderr, "  -dct int       Use integer DCT method%s\n",
166          (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
167#endif
168#ifdef DCT_IFAST_SUPPORTED
169  fprintf(stderr, "  -dct fast      Use fast integer DCT (less accurate)%s\n",
170          (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
171#endif
172#ifdef DCT_FLOAT_SUPPORTED
173  fprintf(stderr, "  -dct float     Use floating-point DCT method%s\n",
174          (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
175#endif
176  fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
177#ifdef INPUT_SMOOTHING_SUPPORTED
178  fprintf(stderr, "  -smooth N      Smooth dithered input (N=1..100 is strength)\n");
179#endif
180  fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
181  fprintf(stderr, "  -outfile name  Specify name for output file\n");
182  fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
183  fprintf(stderr, "Switches for wizards:\n");
184#ifdef C_ARITH_CODING_SUPPORTED
185  fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
186#endif
187  fprintf(stderr, "  -baseline      Force baseline quantization tables\n");
188  fprintf(stderr, "  -qtables file  Use quantization tables given in file\n");
189  fprintf(stderr, "  -qslots N[,...]    Set component quantization tables\n");
190  fprintf(stderr, "  -sample HxV[,...]  Set component sampling factors\n");
191#ifdef C_MULTISCAN_FILES_SUPPORTED
192  fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
193#endif
194  exit(EXIT_FAILURE);
195}
196
197
198LOCAL(int)
199parse_switches (j_compress_ptr cinfo, int argc, char **argv,
200                int last_file_arg_seen, boolean for_real)
201/* Parse optional switches.
202 * Returns argv[] index of first file-name argument (== argc if none).
203 * Any file names with indexes <= last_file_arg_seen are ignored;
204 * they have presumably been processed in a previous iteration.
205 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
206 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
207 * processing.
208 */
209{
210  int argn;
211  char * arg;
212  int quality;                  /* -quality parameter */
213  int q_scale_factor;           /* scaling percentage for -qtables */
214  boolean force_baseline;
215  boolean simple_progressive;
216  char * qtablefile = NULL;     /* saves -qtables filename if any */
217  char * qslotsarg = NULL;      /* saves -qslots parm if any */
218  char * samplearg = NULL;      /* saves -sample parm if any */
219  char * scansarg = NULL;       /* saves -scans parm if any */
220
221  /* Set up default JPEG parameters. */
222  /* Note that default -quality level need not, and does not,
223   * match the default scaling for an explicit -qtables argument.
224   */
225  quality = 75;                 /* default -quality value */
226  q_scale_factor = 100;         /* default to no scaling for -qtables */
227  force_baseline = FALSE;       /* by default, allow 16-bit quantizers */
228  simple_progressive = FALSE;
229  is_targa = FALSE;
230  outfilename = NULL;
231  cinfo->err->trace_level = 0;
232
233  /* Scan command line options, adjust parameters */
234
235  for (argn = 1; argn < argc; argn++) {
236    arg = argv[argn];
237    if (*arg != '-') {
238      /* Not a switch, must be a file name argument */
239      if (argn <= last_file_arg_seen) {
240        outfilename = NULL;     /* -outfile applies to just one input file */
241        continue;               /* ignore this name if previously processed */
242      }
243      break;                    /* else done parsing switches */
244    }
245    arg++;                      /* advance past switch marker character */
246
247    if (keymatch(arg, "arithmetic", 1)) {
248      /* Use arithmetic coding. */
249#ifdef C_ARITH_CODING_SUPPORTED
250      cinfo->arith_code = TRUE;
251#else
252      fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
253              progname);
254      exit(EXIT_FAILURE);
255#endif
256
257    } else if (keymatch(arg, "baseline", 1)) {
258      /* Force baseline-compatible output (8-bit quantizer values). */
259      force_baseline = TRUE;
260
261    } else if (keymatch(arg, "dct", 2)) {
262      /* Select DCT algorithm. */
263      if (++argn >= argc)       /* advance to next argument */
264        usage();
265      if (keymatch(argv[argn], "int", 1)) {
266        cinfo->dct_method = JDCT_ISLOW;
267      } else if (keymatch(argv[argn], "fast", 2)) {
268        cinfo->dct_method = JDCT_IFAST;
269      } else if (keymatch(argv[argn], "float", 2)) {
270        cinfo->dct_method = JDCT_FLOAT;
271      } else
272        usage();
273
274    } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
275      /* Enable debug printouts. */
276      /* On first -d, print version identification */
277      static boolean printed_version = FALSE;
278
279      if (! printed_version) {
280        fprintf(stderr, "Independent JPEG Group's CJPEG, version %s\n%s\n",
281                JVERSION, JCOPYRIGHT);
282        printed_version = TRUE;
283      }
284      cinfo->err->trace_level++;
285
286    } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
287      /* Force a monochrome JPEG file to be generated. */
288      jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
289
290    } else if (keymatch(arg, "maxmemory", 3)) {
291      /* Maximum memory in Kb (or Mb with 'm'). */
292      long lval;
293      char ch = 'x';
294
295      if (++argn >= argc)       /* advance to next argument */
296        usage();
297      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
298        usage();
299      if (ch == 'm' || ch == 'M')
300        lval *= 1000L;
301      cinfo->mem->max_memory_to_use = lval * 1000L;
302
303    } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
304      /* Enable entropy parm optimization. */
305#ifdef ENTROPY_OPT_SUPPORTED
306      cinfo->optimize_coding = TRUE;
307#else
308      fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
309              progname);
310      exit(EXIT_FAILURE);
311#endif
312
313    } else if (keymatch(arg, "outfile", 4)) {
314      /* Set output file name. */
315      if (++argn >= argc)       /* advance to next argument */
316        usage();
317      outfilename = argv[argn]; /* save it away for later use */
318
319    } else if (keymatch(arg, "progressive", 1)) {
320      /* Select simple progressive mode. */
321#ifdef C_PROGRESSIVE_SUPPORTED
322      simple_progressive = TRUE;
323      /* We must postpone execution until num_components is known. */
324#else
325      fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
326              progname);
327      exit(EXIT_FAILURE);
328#endif
329
330    } else if (keymatch(arg, "quality", 1)) {
331      /* Quality factor (quantization table scaling factor). */
332      if (++argn >= argc)       /* advance to next argument */
333        usage();
334      if (sscanf(argv[argn], "%d", &quality) != 1)
335        usage();
336      /* Change scale factor in case -qtables is present. */
337      q_scale_factor = jpeg_quality_scaling(quality);
338
339    } else if (keymatch(arg, "qslots", 2)) {
340      /* Quantization table slot numbers. */
341      if (++argn >= argc)       /* advance to next argument */
342        usage();
343      qslotsarg = argv[argn];
344      /* Must delay setting qslots until after we have processed any
345       * colorspace-determining switches, since jpeg_set_colorspace sets
346       * default quant table numbers.
347       */
348
349    } else if (keymatch(arg, "qtables", 2)) {
350      /* Quantization tables fetched from file. */
351      if (++argn >= argc)       /* advance to next argument */
352        usage();
353      qtablefile = argv[argn];
354      /* We postpone actually reading the file in case -quality comes later. */
355
356    } else if (keymatch(arg, "restart", 1)) {
357      /* Restart interval in MCU rows (or in MCUs with 'b'). */
358      long lval;
359      char ch = 'x';
360
361      if (++argn >= argc)       /* advance to next argument */
362        usage();
363      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
364        usage();
365      if (lval < 0 || lval > 65535L)
366        usage();
367      if (ch == 'b' || ch == 'B') {
368        cinfo->restart_interval = (unsigned int) lval;
369        cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
370      } else {
371        cinfo->restart_in_rows = (int) lval;
372        /* restart_interval will be computed during startup */
373      }
374
375    } else if (keymatch(arg, "sample", 2)) {
376      /* Set sampling factors. */
377      if (++argn >= argc)       /* advance to next argument */
378        usage();
379      samplearg = argv[argn];
380      /* Must delay setting sample factors until after we have processed any
381       * colorspace-determining switches, since jpeg_set_colorspace sets
382       * default sampling factors.
383       */
384
385    } else if (keymatch(arg, "scans", 2)) {
386      /* Set scan script. */
387#ifdef C_MULTISCAN_FILES_SUPPORTED
388      if (++argn >= argc)       /* advance to next argument */
389        usage();
390      scansarg = argv[argn];
391      /* We must postpone reading the file in case -progressive appears. */
392#else
393      fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
394              progname);
395      exit(EXIT_FAILURE);
396#endif
397
398    } else if (keymatch(arg, "smooth", 2)) {
399      /* Set input smoothing factor. */
400      int val;
401
402      if (++argn >= argc)       /* advance to next argument */
403        usage();
404      if (sscanf(argv[argn], "%d", &val) != 1)
405        usage();
406      if (val < 0 || val > 100)
407        usage();
408      cinfo->smoothing_factor = val;
409
410    } else if (keymatch(arg, "targa", 1)) {
411      /* Input file is Targa format. */
412      is_targa = TRUE;
413
414    } else {
415      usage();                  /* bogus switch */
416    }
417  }
418
419  /* Post-switch-scanning cleanup */
420
421  if (for_real) {
422
423    /* Set quantization tables for selected quality. */
424    /* Some or all may be overridden if -qtables is present. */
425    jpeg_set_quality(cinfo, quality, force_baseline);
426
427    if (qtablefile != NULL)     /* process -qtables if it was present */
428      if (! read_quant_tables(cinfo, qtablefile,
429                              q_scale_factor, force_baseline))
430        usage();
431
432    if (qslotsarg != NULL)      /* process -qslots if it was present */
433      if (! set_quant_slots(cinfo, qslotsarg))
434        usage();
435
436    if (samplearg != NULL)      /* process -sample if it was present */
437      if (! set_sample_factors(cinfo, samplearg))
438        usage();
439
440#ifdef C_PROGRESSIVE_SUPPORTED
441    if (simple_progressive)     /* process -progressive; -scans can override */
442      jpeg_simple_progression(cinfo);
443#endif
444
445#ifdef C_MULTISCAN_FILES_SUPPORTED
446    if (scansarg != NULL)       /* process -scans if it was present */
447      if (! read_scan_script(cinfo, scansarg))
448        usage();
449#endif
450  }
451
452  return argn;                  /* return index of next arg (file name) */
453}
454
455
456/*
457 * The main program.
458 */
459
460int
461main (int argc, char **argv)
462{
463  struct jpeg_compress_struct cinfo;
464  struct jpeg_error_mgr jerr;
465#ifdef PROGRESS_REPORT
466  struct cdjpeg_progress_mgr progress;
467#endif
468  int file_index;
469  cjpeg_source_ptr src_mgr;
470  FILE * input_file;
471  FILE * output_file;
472  JDIMENSION num_scanlines;
473
474  /* On Mac, fetch a command line. */
475#ifdef USE_CCOMMAND
476  argc = ccommand(&argv);
477#endif
478
479  progname = argv[0];
480  if (progname == NULL || progname[0] == 0)
481    progname = "cjpeg";         /* in case C library doesn't provide it */
482
483  /* Initialize the JPEG compression object with default error handling. */
484  cinfo.err = jpeg_std_error(&jerr);
485  jpeg_create_compress(&cinfo);
486  /* Add some application-specific error messages (from cderror.h) */
487  jerr.addon_message_table = cdjpeg_message_table;
488  jerr.first_addon_message = JMSG_FIRSTADDONCODE;
489  jerr.last_addon_message = JMSG_LASTADDONCODE;
490
491  /* Now safe to enable signal catcher. */
492#ifdef NEED_SIGNAL_CATCHER
493  enable_signal_catcher((j_common_ptr) &cinfo);
494#endif
495
496  /* Initialize JPEG parameters.
497   * Much of this may be overridden later.
498   * In particular, we don't yet know the input file's color space,
499   * but we need to provide some value for jpeg_set_defaults() to work.
500   */
501
502  cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
503  jpeg_set_defaults(&cinfo);
504
505  /* Scan command line to find file names.
506   * It is convenient to use just one switch-parsing routine, but the switch
507   * values read here are ignored; we will rescan the switches after opening
508   * the input file.
509   */
510
511  file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
512
513#ifdef TWO_FILE_COMMANDLINE
514  /* Must have either -outfile switch or explicit output file name */
515  if (outfilename == NULL) {
516    if (file_index != argc-2) {
517      fprintf(stderr, "%s: must name one input and one output file\n",
518              progname);
519      usage();
520    }
521    outfilename = argv[file_index+1];
522  } else {
523    if (file_index != argc-1) {
524      fprintf(stderr, "%s: must name one input and one output file\n",
525              progname);
526      usage();
527    }
528  }
529#else
530  /* Unix style: expect zero or one file name */
531  if (file_index < argc-1) {
532    fprintf(stderr, "%s: only one input file\n", progname);
533    usage();
534  }
535#endif /* TWO_FILE_COMMANDLINE */
536
537  /* Open the input file. */
538  if (file_index < argc) {
539    if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
540      fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
541      exit(EXIT_FAILURE);
542    }
543  } else {
544    /* default input file is stdin */
545    input_file = read_stdin();
546  }
547
548  /* Open the output file. */
549  if (outfilename != NULL) {
550    if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
551      fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
552      exit(EXIT_FAILURE);
553    }
554  } else {
555    /* default output file is stdout */
556    output_file = write_stdout();
557  }
558
559#ifdef PROGRESS_REPORT
560  start_progress_monitor((j_common_ptr) &cinfo, &progress);
561#endif
562
563  /* Figure out the input file format, and set up to read it. */
564  src_mgr = select_file_type(&cinfo, input_file);
565  src_mgr->input_file = input_file;
566
567  /* Read the input file header to obtain file size & colorspace. */
568  (*src_mgr->start_input) (&cinfo, src_mgr);
569
570  /* Now that we know input colorspace, fix colorspace-dependent defaults */
571  jpeg_default_colorspace(&cinfo);
572
573  /* Adjust default compression parameters by re-parsing the options */
574  file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
575
576  /* Specify data destination for compression */
577  jpeg_stdio_dest(&cinfo, output_file);
578
579  /* Start compressor */
580  jpeg_start_compress(&cinfo, TRUE);
581
582  /* Process data */
583  while (cinfo.next_scanline < cinfo.image_height) {
584    num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
585    (void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
586  }
587
588  /* Finish compression and release memory */
589  (*src_mgr->finish_input) (&cinfo, src_mgr);
590  jpeg_finish_compress(&cinfo);
591  jpeg_destroy_compress(&cinfo);
592
593  /* Close files, if we opened them */
594  if (input_file != stdin)
595    fclose(input_file);
596  if (output_file != stdout)
597    fclose(output_file);
598
599#ifdef PROGRESS_REPORT
600  end_progress_monitor((j_common_ptr) &cinfo);
601#endif
602
603  /* All done. */
604  exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
605  return 0;                     /* suppress no-return-value warnings */
606}
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