4 * Copyright (C) 1991-1998, Thomas G. Lane.
5 * Modified 2003-2010 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.
9 * This file contains a command-line user interface for the JPEG compressor.
10 * It should work on any system with Unix- or MS-DOS-style command lines.
12 * Two different command line styles are permitted, depending on the
13 * compile-time switch TWO_FILE_COMMANDLINE:
14 * cjpeg [options] inputfile outputfile
15 * cjpeg [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 * cjpeg [options] -outfile outputfile inputfile
24 * works regardless of which command line style is used.
27 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
28 #include "jversion.h" /* for version message */
30 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */
32 #include <SIOUX.h> /* Metrowerks needs this */
33 #include <console.h> /* ... and this */
36 #include <console.h> /* Think declares it here */
41 /* Create the add-on message string table. */
43 #define JMESSAGE(code,string) string ,
45 static const char * const cdjpeg_message_table[] = {
52 * This routine determines what format the input file is,
53 * and selects the appropriate input-reading module.
55 * To determine which family of input formats the file belongs to,
56 * we may look only at the first byte of the file, since C does not
57 * guarantee that more than one character can be pushed back with ungetc.
58 * Looking at additional bytes would require one of these approaches:
59 * 1) assume we can fseek() the input file (fails for piped input);
60 * 2) assume we can push back more than one character (works in
61 * some C implementations, but unportable);
62 * 3) provide our own buffering (breaks input readers that want to use
63 * stdio directly, such as the RLE library);
64 * or 4) don't put back the data, and modify the input_init methods to assume
65 * they start reading after the start of file (also breaks RLE library).
66 * #1 is attractive for MS-DOS but is untenable on Unix.
68 * The most portable solution for file types that can't be identified by their
69 * first byte is to make the user tell us what they are. This is also the
70 * only approach for "raw" file types that contain only arbitrary values.
71 * We presently apply this method for Targa files. Most of the time Targa
72 * files start with 0x00, so we recognize that case. Potentially, however,
73 * a Targa file could start with any byte value (byte 0 is the length of the
74 * seldom-used ID field), so we provide a switch to force Targa input mode.
77 static boolean is_targa; /* records user -targa switch */
80 LOCAL(cjpeg_source_ptr)
81 select_file_type (j_compress_ptr cinfo, FILE * infile)
86 #ifdef TARGA_SUPPORTED
87 return jinit_read_targa(cinfo);
89 ERREXIT(cinfo, JERR_TGA_NOTCOMP);
93 if ((c = getc(infile)) == EOF)
94 ERREXIT(cinfo, JERR_INPUT_EMPTY);
95 if (ungetc(c, infile) == EOF)
96 ERREXIT(cinfo, JERR_UNGETC_FAILED);
101 return jinit_read_bmp(cinfo);
105 return jinit_read_gif(cinfo);
109 return jinit_read_ppm(cinfo);
113 return jinit_read_rle(cinfo);
115 #ifdef TARGA_SUPPORTED
117 return jinit_read_targa(cinfo);
120 ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
124 return NULL; /* suppress compiler warnings */
129 * Argument-parsing code.
130 * The switch parser is designed to be useful with DOS-style command line
131 * syntax, ie, intermixed switches and file names, where only the switches
132 * to the left of a given file name affect processing of that file.
133 * The main program in this file doesn't actually use this capability...
137 static const char * progname; /* program name for error messages */
138 static char * outfilename; /* for -outfile switch */
143 /* complain about bad command line */
145 fprintf(stderr, "usage: %s [switches] ", progname);
146 #ifdef TWO_FILE_COMMANDLINE
147 fprintf(stderr, "inputfile outputfile\n");
149 fprintf(stderr, "[inputfile]\n");
152 fprintf(stderr, "Switches (names may be abbreviated):\n");
153 fprintf(stderr, " -quality N[,...] Compression quality (0..100; 5-95 is useful range)\n");
154 fprintf(stderr, " -grayscale Create monochrome JPEG file\n");
155 #ifdef ENTROPY_OPT_SUPPORTED
156 fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");
158 #ifdef C_PROGRESSIVE_SUPPORTED
159 fprintf(stderr, " -progressive Create progressive JPEG file\n");
161 #ifdef DCT_SCALING_SUPPORTED
162 fprintf(stderr, " -scale M/N Scale image by fraction M/N, eg, 1/2\n");
164 #ifdef TARGA_SUPPORTED
165 fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n");
167 fprintf(stderr, "Switches for advanced users:\n");
168 #ifdef DCT_SCALING_SUPPORTED
169 fprintf(stderr, " -block N DCT block size (1..16; default is 8)\n");
171 #ifdef DCT_ISLOW_SUPPORTED
172 fprintf(stderr, " -dct int Use integer DCT method%s\n",
173 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
175 #ifdef DCT_IFAST_SUPPORTED
176 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
177 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
179 #ifdef DCT_FLOAT_SUPPORTED
180 fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
181 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
183 fprintf(stderr, " -nosmooth Don't use high-quality downsampling\n");
184 fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");
185 #ifdef INPUT_SMOOTHING_SUPPORTED
186 fprintf(stderr, " -smooth N Smooth dithered input (N=1..100 is strength)\n");
188 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
189 fprintf(stderr, " -outfile name Specify name for output file\n");
190 fprintf(stderr, " -verbose or -debug Emit debug output\n");
191 fprintf(stderr, "Switches for wizards:\n");
192 #ifdef C_ARITH_CODING_SUPPORTED
193 fprintf(stderr, " -arithmetic Use arithmetic coding\n");
195 fprintf(stderr, " -baseline Force baseline quantization tables\n");
196 fprintf(stderr, " -qtables file Use quantization tables given in file\n");
197 fprintf(stderr, " -qslots N[,...] Set component quantization tables\n");
198 fprintf(stderr, " -sample HxV[,...] Set component sampling factors\n");
199 #ifdef C_MULTISCAN_FILES_SUPPORTED
200 fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
207 parse_switches (j_compress_ptr cinfo, int argc, char **argv,
208 int last_file_arg_seen, boolean for_real)
209 /* Parse optional switches.
210 * Returns argv[] index of first file-name argument (== argc if none).
211 * Any file names with indexes <= last_file_arg_seen are ignored;
212 * they have presumably been processed in a previous iteration.
213 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
214 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
220 boolean force_baseline;
221 boolean simple_progressive;
222 char * qualityarg = NULL; /* saves -quality parm if any */
223 char * qtablefile = NULL; /* saves -qtables filename if any */
224 char * qslotsarg = NULL; /* saves -qslots parm if any */
225 char * samplearg = NULL; /* saves -sample parm if any */
226 char * scansarg = NULL; /* saves -scans parm if any */
228 /* Set up default JPEG parameters. */
230 force_baseline = FALSE; /* by default, allow 16-bit quantizers */
231 simple_progressive = FALSE;
234 cinfo->err->trace_level = 0;
236 /* Scan command line options, adjust parameters */
238 for (argn = 1; argn < argc; argn++) {
241 /* Not a switch, must be a file name argument */
242 if (argn <= last_file_arg_seen) {
243 outfilename = NULL; /* -outfile applies to just one input file */
244 continue; /* ignore this name if previously processed */
246 break; /* else done parsing switches */
248 arg++; /* advance past switch marker character */
250 if (keymatch(arg, "arithmetic", 1)) {
251 /* Use arithmetic coding. */
252 #ifdef C_ARITH_CODING_SUPPORTED
253 cinfo->arith_code = TRUE;
255 fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
260 } else if (keymatch(arg, "baseline", 2)) {
261 /* Force baseline-compatible output (8-bit quantizer values). */
262 force_baseline = TRUE;
264 } else if (keymatch(arg, "block", 2)) {
265 /* Set DCT block size. */
266 #if defined(DCT_SCALING_SUPPORTED) && defined(JPEG_LIB_VERSION_MAJOR) && \
267 (JPEG_LIB_VERSION_MAJOR > 8 || (JPEG_LIB_VERSION_MAJOR == 8 && \
268 defined(JPEG_LIB_VERSION_MINOR) && JPEG_LIB_VERSION_MINOR >= 3))
271 if (++argn >= argc) /* advance to next argument */
273 if (sscanf(argv[argn], "%d", &val) != 1)
275 if (val < 1 || val > 16)
277 cinfo->block_size = val;
279 fprintf(stderr, "%s: sorry, block size setting not supported\n",
284 } else if (keymatch(arg, "dct", 2)) {
285 /* Select DCT algorithm. */
286 if (++argn >= argc) /* advance to next argument */
288 if (keymatch(argv[argn], "int", 1)) {
289 cinfo->dct_method = JDCT_ISLOW;
290 } else if (keymatch(argv[argn], "fast", 2)) {
291 cinfo->dct_method = JDCT_IFAST;
292 } else if (keymatch(argv[argn], "float", 2)) {
293 cinfo->dct_method = JDCT_FLOAT;
297 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
298 /* Enable debug printouts. */
299 /* On first -d, print version identification */
300 static boolean printed_version = FALSE;
302 if (! printed_version) {
303 fprintf(stderr, "Independent JPEG Group's CJPEG, version %s\n%s\n",
304 JVERSION, JCOPYRIGHT);
305 printed_version = TRUE;
307 cinfo->err->trace_level++;
309 } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
310 /* Force a monochrome JPEG file to be generated. */
311 jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
313 } else if (keymatch(arg, "maxmemory", 3)) {
314 /* Maximum memory in Kb (or Mb with 'm'). */
318 if (++argn >= argc) /* advance to next argument */
320 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
322 if (ch == 'm' || ch == 'M')
324 cinfo->mem->max_memory_to_use = lval * 1000L;
326 } else if (keymatch(arg, "nosmooth", 3)) {
327 /* Suppress fancy downsampling */
328 cinfo->do_fancy_downsampling = FALSE;
330 } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
331 /* Enable entropy parm optimization. */
332 #ifdef ENTROPY_OPT_SUPPORTED
333 cinfo->optimize_coding = TRUE;
335 fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
340 } else if (keymatch(arg, "outfile", 4)) {
341 /* Set output file name. */
342 if (++argn >= argc) /* advance to next argument */
344 outfilename = argv[argn]; /* save it away for later use */
346 } else if (keymatch(arg, "progressive", 1)) {
347 /* Select simple progressive mode. */
348 #ifdef C_PROGRESSIVE_SUPPORTED
349 simple_progressive = TRUE;
350 /* We must postpone execution until num_components is known. */
352 fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
357 } else if (keymatch(arg, "quality", 1)) {
358 /* Quality ratings (quantization table scaling factors). */
359 if (++argn >= argc) /* advance to next argument */
361 qualityarg = argv[argn];
363 } else if (keymatch(arg, "qslots", 2)) {
364 /* Quantization table slot numbers. */
365 if (++argn >= argc) /* advance to next argument */
367 qslotsarg = argv[argn];
368 /* Must delay setting qslots until after we have processed any
369 * colorspace-determining switches, since jpeg_set_colorspace sets
370 * default quant table numbers.
373 } else if (keymatch(arg, "qtables", 2)) {
374 /* Quantization tables fetched from file. */
375 if (++argn >= argc) /* advance to next argument */
377 qtablefile = argv[argn];
378 /* We postpone actually reading the file in case -quality comes later. */
380 } else if (keymatch(arg, "restart", 1)) {
381 /* Restart interval in MCU rows (or in MCUs with 'b'). */
385 if (++argn >= argc) /* advance to next argument */
387 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
389 if (lval < 0 || lval > 65535L)
391 if (ch == 'b' || ch == 'B') {
392 cinfo->restart_interval = (unsigned int) lval;
393 cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
395 cinfo->restart_in_rows = (int) lval;
396 /* restart_interval will be computed during startup */
399 } else if (keymatch(arg, "sample", 2)) {
400 /* Set sampling factors. */
401 if (++argn >= argc) /* advance to next argument */
403 samplearg = argv[argn];
404 /* Must delay setting sample factors until after we have processed any
405 * colorspace-determining switches, since jpeg_set_colorspace sets
406 * default sampling factors.
409 } else if (keymatch(arg, "scale", 4)) {
410 /* Scale the image by a fraction M/N. */
411 if (++argn >= argc) /* advance to next argument */
413 if (sscanf(argv[argn], "%d/%d",
414 &cinfo->scale_num, &cinfo->scale_denom) != 2)
417 } else if (keymatch(arg, "scans", 4)) {
418 /* Set scan script. */
419 #ifdef C_MULTISCAN_FILES_SUPPORTED
420 if (++argn >= argc) /* advance to next argument */
422 scansarg = argv[argn];
423 /* We must postpone reading the file in case -progressive appears. */
425 fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
430 } else if (keymatch(arg, "smooth", 2)) {
431 /* Set input smoothing factor. */
434 if (++argn >= argc) /* advance to next argument */
436 if (sscanf(argv[argn], "%d", &val) != 1)
438 if (val < 0 || val > 100)
440 cinfo->smoothing_factor = val;
442 } else if (keymatch(arg, "targa", 1)) {
443 /* Input file is Targa format. */
447 usage(); /* bogus switch */
451 /* Post-switch-scanning cleanup */
455 /* Set quantization tables for selected quality. */
456 /* Some or all may be overridden if -qtables is present. */
457 if (qualityarg != NULL) /* process -quality if it was present */
458 if (! set_quality_ratings(cinfo, qualityarg, force_baseline))
461 if (qtablefile != NULL) /* process -qtables if it was present */
462 if (! read_quant_tables(cinfo, qtablefile, force_baseline))
465 if (qslotsarg != NULL) /* process -qslots if it was present */
466 if (! set_quant_slots(cinfo, qslotsarg))
469 if (samplearg != NULL) /* process -sample if it was present */
470 if (! set_sample_factors(cinfo, samplearg))
473 #ifdef C_PROGRESSIVE_SUPPORTED
474 if (simple_progressive) /* process -progressive; -scans can override */
475 jpeg_simple_progression(cinfo);
478 #ifdef C_MULTISCAN_FILES_SUPPORTED
479 if (scansarg != NULL) /* process -scans if it was present */
480 if (! read_scan_script(cinfo, scansarg))
485 return argn; /* return index of next arg (file name) */
494 main (int argc, char **argv)
496 struct jpeg_compress_struct cinfo;
497 struct jpeg_error_mgr jerr;
498 #ifdef PROGRESS_REPORT
499 struct cdjpeg_progress_mgr progress;
502 cjpeg_source_ptr src_mgr;
505 JDIMENSION num_scanlines;
507 /* On Mac, fetch a command line. */
509 argc = ccommand(&argv);
513 if (progname == NULL || progname[0] == 0)
514 progname = "cjpeg"; /* in case C library doesn't provide it */
516 /* Initialize the JPEG compression object with default error handling. */
517 cinfo.err = jpeg_std_error(&jerr);
518 jpeg_create_compress(&cinfo);
519 /* Add some application-specific error messages (from cderror.h) */
520 jerr.addon_message_table = cdjpeg_message_table;
521 jerr.first_addon_message = JMSG_FIRSTADDONCODE;
522 jerr.last_addon_message = JMSG_LASTADDONCODE;
524 /* Now safe to enable signal catcher. */
525 #ifdef NEED_SIGNAL_CATCHER
526 enable_signal_catcher((j_common_ptr) &cinfo);
529 /* Initialize JPEG parameters.
530 * Much of this may be overridden later.
531 * In particular, we don't yet know the input file's color space,
532 * but we need to provide some value for jpeg_set_defaults() to work.
535 cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
536 jpeg_set_defaults(&cinfo);
538 /* Scan command line to find file names.
539 * It is convenient to use just one switch-parsing routine, but the switch
540 * values read here are ignored; we will rescan the switches after opening
544 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
546 #ifdef TWO_FILE_COMMANDLINE
547 /* Must have either -outfile switch or explicit output file name */
548 if (outfilename == NULL) {
549 if (file_index != argc-2) {
550 fprintf(stderr, "%s: must name one input and one output file\n",
554 outfilename = argv[file_index+1];
556 if (file_index != argc-1) {
557 fprintf(stderr, "%s: must name one input and one output file\n",
563 /* Unix style: expect zero or one file name */
564 if (file_index < argc-1) {
565 fprintf(stderr, "%s: only one input file\n", progname);
568 #endif /* TWO_FILE_COMMANDLINE */
570 /* Open the input file. */
571 if (file_index < argc) {
572 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
573 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
577 /* default input file is stdin */
578 input_file = read_stdin();
581 /* Open the output file. */
582 if (outfilename != NULL) {
583 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
584 fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
588 /* default output file is stdout */
589 output_file = write_stdout();
592 #ifdef PROGRESS_REPORT
593 start_progress_monitor((j_common_ptr) &cinfo, &progress);
596 /* Figure out the input file format, and set up to read it. */
597 src_mgr = select_file_type(&cinfo, input_file);
598 src_mgr->input_file = input_file;
600 /* Read the input file header to obtain file size & colorspace. */
601 (*src_mgr->start_input) (&cinfo, src_mgr);
603 /* Now that we know input colorspace, fix colorspace-dependent defaults */
604 jpeg_default_colorspace(&cinfo);
606 /* Adjust default compression parameters by re-parsing the options */
607 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
609 /* Specify data destination for compression */
610 jpeg_stdio_dest(&cinfo, output_file);
612 /* Start compressor */
613 jpeg_start_compress(&cinfo, TRUE);
616 while (cinfo.next_scanline < cinfo.image_height) {
617 num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
618 (void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
621 /* Finish compression and release memory */
622 (*src_mgr->finish_input) (&cinfo, src_mgr);
623 jpeg_finish_compress(&cinfo);
624 jpeg_destroy_compress(&cinfo);
626 /* Close files, if we opened them */
627 if (input_file != stdin)
629 if (output_file != stdout)
632 #ifdef PROGRESS_REPORT
633 end_progress_monitor((j_common_ptr) &cinfo);
637 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
638 return 0; /* suppress no-return-value warnings */