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} 607