4 * This file was part of the Independent JPEG Group's software:
5 * Copyright (C) 1991-1998, Thomas G. Lane.
6 * Modified 2003-2011 by Guido Vollbeding.
7 * libjpeg-turbo Modifications:
8 * Copyright (C) 2010, 2013, D. R. Commander.
9 * For conditions of distribution and use, see the accompanying README file.
11 * This file contains a command-line user interface for the JPEG compressor.
12 * It should work on any system with Unix- or MS-DOS-style command lines.
14 * Two different command line styles are permitted, depending on the
15 * compile-time switch TWO_FILE_COMMANDLINE:
16 * cjpeg [options] inputfile outputfile
17 * cjpeg [options] [inputfile]
18 * In the second style, output is always to standard output, which you'd
19 * normally redirect to a file or pipe to some other program. Input is
20 * either from a named file or from standard input (typically redirected).
21 * The second style is convenient on Unix but is unhelpful on systems that
22 * don't support pipes. Also, you MUST use the first style if your system
23 * doesn't do binary I/O to stdin/stdout.
24 * To simplify script writing, the "-outfile" switch is provided. The syntax
25 * cjpeg [options] -outfile outputfile inputfile
26 * works regardless of which command line style is used.
29 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
30 #include "jversion.h" /* for version message */
33 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */
35 #include <SIOUX.h> /* Metrowerks needs this */
36 #include <console.h> /* ... and this */
39 #include <console.h> /* Think declares it here */
44 /* Create the add-on message string table. */
46 #define JMESSAGE(code,string) string ,
48 static const char * const cdjpeg_message_table[] = {
55 * This routine determines what format the input file is,
56 * and selects the appropriate input-reading module.
58 * To determine which family of input formats the file belongs to,
59 * we may look only at the first byte of the file, since C does not
60 * guarantee that more than one character can be pushed back with ungetc.
61 * Looking at additional bytes would require one of these approaches:
62 * 1) assume we can fseek() the input file (fails for piped input);
63 * 2) assume we can push back more than one character (works in
64 * some C implementations, but unportable);
65 * 3) provide our own buffering (breaks input readers that want to use
66 * stdio directly, such as the RLE library);
67 * or 4) don't put back the data, and modify the input_init methods to assume
68 * they start reading after the start of file (also breaks RLE library).
69 * #1 is attractive for MS-DOS but is untenable on Unix.
71 * The most portable solution for file types that can't be identified by their
72 * first byte is to make the user tell us what they are. This is also the
73 * only approach for "raw" file types that contain only arbitrary values.
74 * We presently apply this method for Targa files. Most of the time Targa
75 * files start with 0x00, so we recognize that case. Potentially, however,
76 * a Targa file could start with any byte value (byte 0 is the length of the
77 * seldom-used ID field), so we provide a switch to force Targa input mode.
80 static boolean is_targa; /* records user -targa switch */
83 LOCAL(cjpeg_source_ptr)
84 select_file_type (j_compress_ptr cinfo, FILE * infile)
89 #ifdef TARGA_SUPPORTED
90 return jinit_read_targa(cinfo);
92 ERREXIT(cinfo, JERR_TGA_NOTCOMP);
96 if ((c = getc(infile)) == EOF)
97 ERREXIT(cinfo, JERR_INPUT_EMPTY);
98 if (ungetc(c, infile) == EOF)
99 ERREXIT(cinfo, JERR_UNGETC_FAILED);
104 return jinit_read_bmp(cinfo);
108 return jinit_read_gif(cinfo);
112 return jinit_read_ppm(cinfo);
116 return jinit_read_rle(cinfo);
118 #ifdef TARGA_SUPPORTED
120 return jinit_read_targa(cinfo);
123 ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
127 return NULL; /* suppress compiler warnings */
132 * Argument-parsing code.
133 * The switch parser is designed to be useful with DOS-style command line
134 * syntax, ie, intermixed switches and file names, where only the switches
135 * to the left of a given file name affect processing of that file.
136 * The main program in this file doesn't actually use this capability...
140 static const char * progname; /* program name for error messages */
141 static char * outfilename; /* for -outfile switch */
142 boolean memdst; /* for -memdst switch */
147 /* complain about bad command line */
149 fprintf(stderr, "usage: %s [switches] ", progname);
150 #ifdef TWO_FILE_COMMANDLINE
151 fprintf(stderr, "inputfile outputfile\n");
153 fprintf(stderr, "[inputfile]\n");
156 fprintf(stderr, "Switches (names may be abbreviated):\n");
157 fprintf(stderr, " -quality N[,...] Compression quality (0..100; 5-95 is useful range)\n");
158 fprintf(stderr, " -grayscale Create monochrome JPEG file\n");
159 fprintf(stderr, " -rgb Create RGB JPEG file\n");
160 #ifdef ENTROPY_OPT_SUPPORTED
161 fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");
163 #ifdef C_PROGRESSIVE_SUPPORTED
164 fprintf(stderr, " -progressive Create progressive JPEG file\n");
166 #ifdef TARGA_SUPPORTED
167 fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n");
169 fprintf(stderr, "Switches for advanced users:\n");
170 #ifdef C_ARITH_CODING_SUPPORTED
171 fprintf(stderr, " -arithmetic Use arithmetic coding\n");
173 #ifdef DCT_ISLOW_SUPPORTED
174 fprintf(stderr, " -dct int Use integer DCT method%s\n",
175 (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
177 #ifdef DCT_IFAST_SUPPORTED
178 fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
179 (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
181 #ifdef DCT_FLOAT_SUPPORTED
182 fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
183 (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
185 fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");
186 #ifdef INPUT_SMOOTHING_SUPPORTED
187 fprintf(stderr, " -smooth N Smooth dithered input (N=1..100 is strength)\n");
189 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
190 fprintf(stderr, " -outfile name Specify name for output file\n");
191 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
192 fprintf(stderr, " -memdst Compress to memory instead of file (useful for benchmarking)\n");
194 fprintf(stderr, " -verbose or -debug Emit debug output\n");
195 fprintf(stderr, "Switches for wizards:\n");
196 fprintf(stderr, " -baseline Force baseline quantization tables\n");
197 fprintf(stderr, " -qtables file Use quantization tables given in file\n");
198 fprintf(stderr, " -qslots N[,...] Set component quantization tables\n");
199 fprintf(stderr, " -sample HxV[,...] Set component sampling factors\n");
200 #ifdef C_MULTISCAN_FILES_SUPPORTED
201 fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
208 parse_switches (j_compress_ptr cinfo, int argc, char **argv,
209 int last_file_arg_seen, boolean for_real)
210 /* Parse optional switches.
211 * Returns argv[] index of first file-name argument (== argc if none).
212 * Any file names with indexes <= last_file_arg_seen are ignored;
213 * they have presumably been processed in a previous iteration.
214 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
215 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
221 boolean force_baseline;
222 boolean simple_progressive;
223 char * qualityarg = NULL; /* saves -quality parm if any */
224 char * qtablefile = NULL; /* saves -qtables filename if any */
225 char * qslotsarg = NULL; /* saves -qslots parm if any */
226 char * samplearg = NULL; /* saves -sample parm if any */
227 char * scansarg = NULL; /* saves -scans parm if any */
229 /* Set up default JPEG parameters. */
231 force_baseline = FALSE; /* by default, allow 16-bit quantizers */
232 simple_progressive = FALSE;
236 cinfo->err->trace_level = 0;
238 /* Scan command line options, adjust parameters */
240 for (argn = 1; argn < argc; argn++) {
243 /* Not a switch, must be a file name argument */
244 if (argn <= last_file_arg_seen) {
245 outfilename = NULL; /* -outfile applies to just one input file */
246 continue; /* ignore this name if previously processed */
248 break; /* else done parsing switches */
250 arg++; /* advance past switch marker character */
252 if (keymatch(arg, "arithmetic", 1)) {
253 /* Use arithmetic coding. */
254 #ifdef C_ARITH_CODING_SUPPORTED
255 cinfo->arith_code = TRUE;
257 fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
262 } else if (keymatch(arg, "baseline", 1)) {
263 /* Force baseline-compatible output (8-bit quantizer values). */
264 force_baseline = TRUE;
266 } else if (keymatch(arg, "dct", 2)) {
267 /* Select DCT algorithm. */
268 if (++argn >= argc) /* advance to next argument */
270 if (keymatch(argv[argn], "int", 1)) {
271 cinfo->dct_method = JDCT_ISLOW;
272 } else if (keymatch(argv[argn], "fast", 2)) {
273 cinfo->dct_method = JDCT_IFAST;
274 } else if (keymatch(argv[argn], "float", 2)) {
275 cinfo->dct_method = JDCT_FLOAT;
279 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
280 /* Enable debug printouts. */
281 /* On first -d, print version identification */
282 static boolean printed_version = FALSE;
284 if (! printed_version) {
285 fprintf(stderr, "%s version %s (build %s)\n",
286 PACKAGE_NAME, VERSION, BUILD);
287 fprintf(stderr, "%s\n\n", JCOPYRIGHT);
288 fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
290 printed_version = TRUE;
292 cinfo->err->trace_level++;
294 } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
295 /* Force a monochrome JPEG file to be generated. */
296 jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
298 } else if (keymatch(arg, "rgb", 3)) {
299 /* Force an RGB JPEG file to be generated. */
300 jpeg_set_colorspace(cinfo, JCS_RGB);
302 } else if (keymatch(arg, "maxmemory", 3)) {
303 /* Maximum memory in Kb (or Mb with 'm'). */
307 if (++argn >= argc) /* advance to next argument */
309 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
311 if (ch == 'm' || ch == 'M')
313 cinfo->mem->max_memory_to_use = lval * 1000L;
315 } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
316 /* Enable entropy parm optimization. */
317 #ifdef ENTROPY_OPT_SUPPORTED
318 cinfo->optimize_coding = TRUE;
320 fprintf(stderr, "%s: sorry, entropy optimization was not compiled in\n",
325 } else if (keymatch(arg, "outfile", 4)) {
326 /* Set output file name. */
327 if (++argn >= argc) /* advance to next argument */
329 outfilename = argv[argn]; /* save it away for later use */
331 } else if (keymatch(arg, "progressive", 1)) {
332 /* Select simple progressive mode. */
333 #ifdef C_PROGRESSIVE_SUPPORTED
334 simple_progressive = TRUE;
335 /* We must postpone execution until num_components is known. */
337 fprintf(stderr, "%s: sorry, progressive output was not compiled in\n",
342 } else if (keymatch(arg, "memdst", 2)) {
343 /* Use in-memory destination manager */
344 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
347 fprintf(stderr, "%s: sorry, in-memory destination manager was not compiled in\n",
352 } else if (keymatch(arg, "quality", 1)) {
353 /* Quality ratings (quantization table scaling factors). */
354 if (++argn >= argc) /* advance to next argument */
356 qualityarg = argv[argn];
358 } else if (keymatch(arg, "qslots", 2)) {
359 /* Quantization table slot numbers. */
360 if (++argn >= argc) /* advance to next argument */
362 qslotsarg = argv[argn];
363 /* Must delay setting qslots until after we have processed any
364 * colorspace-determining switches, since jpeg_set_colorspace sets
365 * default quant table numbers.
368 } else if (keymatch(arg, "qtables", 2)) {
369 /* Quantization tables fetched from file. */
370 if (++argn >= argc) /* advance to next argument */
372 qtablefile = argv[argn];
373 /* We postpone actually reading the file in case -quality comes later. */
375 } else if (keymatch(arg, "restart", 1)) {
376 /* Restart interval in MCU rows (or in MCUs with 'b'). */
380 if (++argn >= argc) /* advance to next argument */
382 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
384 if (lval < 0 || lval > 65535L)
386 if (ch == 'b' || ch == 'B') {
387 cinfo->restart_interval = (unsigned int) lval;
388 cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
390 cinfo->restart_in_rows = (int) lval;
391 /* restart_interval will be computed during startup */
394 } else if (keymatch(arg, "sample", 2)) {
395 /* Set sampling factors. */
396 if (++argn >= argc) /* advance to next argument */
398 samplearg = argv[argn];
399 /* Must delay setting sample factors until after we have processed any
400 * colorspace-determining switches, since jpeg_set_colorspace sets
401 * default sampling factors.
404 } else if (keymatch(arg, "scans", 4)) {
405 /* Set scan script. */
406 #ifdef C_MULTISCAN_FILES_SUPPORTED
407 if (++argn >= argc) /* advance to next argument */
409 scansarg = argv[argn];
410 /* We must postpone reading the file in case -progressive appears. */
412 fprintf(stderr, "%s: sorry, multi-scan output was not compiled in\n",
417 } else if (keymatch(arg, "smooth", 2)) {
418 /* Set input smoothing factor. */
421 if (++argn >= argc) /* advance to next argument */
423 if (sscanf(argv[argn], "%d", &val) != 1)
425 if (val < 0 || val > 100)
427 cinfo->smoothing_factor = val;
429 } else if (keymatch(arg, "targa", 1)) {
430 /* Input file is Targa format. */
434 usage(); /* bogus switch */
438 /* Post-switch-scanning cleanup */
442 /* Set quantization tables for selected quality. */
443 /* Some or all may be overridden if -qtables is present. */
444 if (qualityarg != NULL) /* process -quality if it was present */
445 if (! set_quality_ratings(cinfo, qualityarg, force_baseline))
448 if (qtablefile != NULL) /* process -qtables if it was present */
449 if (! read_quant_tables(cinfo, qtablefile, force_baseline))
452 if (qslotsarg != NULL) /* process -qslots if it was present */
453 if (! set_quant_slots(cinfo, qslotsarg))
456 if (samplearg != NULL) /* process -sample if it was present */
457 if (! set_sample_factors(cinfo, samplearg))
460 #ifdef C_PROGRESSIVE_SUPPORTED
461 if (simple_progressive) /* process -progressive; -scans can override */
462 jpeg_simple_progression(cinfo);
465 #ifdef C_MULTISCAN_FILES_SUPPORTED
466 if (scansarg != NULL) /* process -scans if it was present */
467 if (! read_scan_script(cinfo, scansarg))
472 return argn; /* return index of next arg (file name) */
481 main (int argc, char **argv)
483 struct jpeg_compress_struct cinfo;
484 struct jpeg_error_mgr jerr;
485 #ifdef PROGRESS_REPORT
486 struct cdjpeg_progress_mgr progress;
489 cjpeg_source_ptr src_mgr;
491 FILE * output_file = NULL;
492 unsigned char *outbuffer = NULL;
493 unsigned long outsize = 0;
494 JDIMENSION num_scanlines;
496 /* On Mac, fetch a command line. */
498 argc = ccommand(&argv);
502 if (progname == NULL || progname[0] == 0)
503 progname = "cjpeg"; /* in case C library doesn't provide it */
505 /* Initialize the JPEG compression object with default error handling. */
506 cinfo.err = jpeg_std_error(&jerr);
507 jpeg_create_compress(&cinfo);
508 /* Add some application-specific error messages (from cderror.h) */
509 jerr.addon_message_table = cdjpeg_message_table;
510 jerr.first_addon_message = JMSG_FIRSTADDONCODE;
511 jerr.last_addon_message = JMSG_LASTADDONCODE;
513 /* Now safe to enable signal catcher. */
514 #ifdef NEED_SIGNAL_CATCHER
515 enable_signal_catcher((j_common_ptr) &cinfo);
518 /* Initialize JPEG parameters.
519 * Much of this may be overridden later.
520 * In particular, we don't yet know the input file's color space,
521 * but we need to provide some value for jpeg_set_defaults() to work.
524 cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
525 jpeg_set_defaults(&cinfo);
527 /* Scan command line to find file names.
528 * It is convenient to use just one switch-parsing routine, but the switch
529 * values read here are ignored; we will rescan the switches after opening
533 file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
535 #ifdef TWO_FILE_COMMANDLINE
537 /* Must have either -outfile switch or explicit output file name */
538 if (outfilename == NULL) {
539 if (file_index != argc-2) {
540 fprintf(stderr, "%s: must name one input and one output file\n",
544 outfilename = argv[file_index+1];
546 if (file_index != argc-1) {
547 fprintf(stderr, "%s: must name one input and one output file\n",
554 /* Unix style: expect zero or one file name */
555 if (file_index < argc-1) {
556 fprintf(stderr, "%s: only one input file\n", progname);
559 #endif /* TWO_FILE_COMMANDLINE */
561 /* Open the input file. */
562 if (file_index < argc) {
563 if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
564 fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
568 /* default input file is stdin */
569 input_file = read_stdin();
572 /* Open the output file. */
573 if (outfilename != NULL) {
574 if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
575 fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
578 } else if (!memdst) {
579 /* default output file is stdout */
580 output_file = write_stdout();
583 #ifdef PROGRESS_REPORT
584 start_progress_monitor((j_common_ptr) &cinfo, &progress);
587 /* Figure out the input file format, and set up to read it. */
588 src_mgr = select_file_type(&cinfo, input_file);
589 src_mgr->input_file = input_file;
591 /* Read the input file header to obtain file size & colorspace. */
592 (*src_mgr->start_input) (&cinfo, src_mgr);
594 /* Now that we know input colorspace, fix colorspace-dependent defaults */
595 jpeg_default_colorspace(&cinfo);
597 /* Adjust default compression parameters by re-parsing the options */
598 file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
600 /* Specify data destination for compression */
601 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
603 jpeg_mem_dest(&cinfo, &outbuffer, &outsize);
606 jpeg_stdio_dest(&cinfo, output_file);
608 /* Start compressor */
609 jpeg_start_compress(&cinfo, TRUE);
612 while (cinfo.next_scanline < cinfo.image_height) {
613 num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
614 (void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
617 /* Finish compression and release memory */
618 (*src_mgr->finish_input) (&cinfo, src_mgr);
619 jpeg_finish_compress(&cinfo);
620 jpeg_destroy_compress(&cinfo);
622 /* Close files, if we opened them */
623 if (input_file != stdin)
625 if (output_file != stdout && output_file != NULL)
628 #ifdef PROGRESS_REPORT
629 end_progress_monitor((j_common_ptr) &cinfo);
633 fprintf(stderr, "Compressed size: %lu bytes\n", outsize);
634 if (outbuffer != NULL)
639 exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
640 return 0; /* suppress no-return-value warnings */