1 /* 2 * jpegtran.c 3 * 4 * This file was part of the Independent JPEG Group's software: 5 * Copyright (C) 1995-2010, Thomas G. Lane, Guido Vollbeding. 6 * libjpeg-turbo Modifications: 7 * Copyright (C) 2010, 2014, D. R. Commander. 8 * For conditions of distribution and use, see the accompanying README.ijg 9 * file. 10 * 11 * This file contains a command-line user interface for JPEG transcoding. 12 * It is very similar to cjpeg.c, and partly to djpeg.c, but provides 13 * lossless transcoding between different JPEG file formats. It also 14 * provides some lossless and sort-of-lossless transformations of JPEG data. 15 */ 16 17 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ 18 #include "transupp.h" /* Support routines for jpegtran */ 19 #include "jversion.h" /* for version message */ 20 #include "jconfigint.h" 21 22 #ifdef USE_CCOMMAND /* command-line reader for Macintosh */ 23 #ifdef __MWERKS__ 24 #include <SIOUX.h> /* Metrowerks needs this */ 25 #include <console.h> /* ... and this */ 26 #endif 27 #ifdef THINK_C 28 #include <console.h> /* Think declares it here */ 29 #endif 30 #endif 31 32 33 /* 34 * Argument-parsing code. 35 * The switch parser is designed to be useful with DOS-style command line 36 * syntax, ie, intermixed switches and file names, where only the switches 37 * to the left of a given file name affect processing of that file. 38 * The main program in this file doesn't actually use this capability... 39 */ 40 41 42 static const char *progname; /* program name for error messages */ 43 static char *outfilename; /* for -outfile switch */ 44 static JCOPY_OPTION copyoption; /* -copy switch */ 45 static jpeg_transform_info transformoption; /* image transformation options */ 46 47 48 LOCAL(void) 49 usage (void) 50 /* complain about bad command line */ 51 { 52 fprintf(stderr, "usage: %s [switches] ", progname); 53 #ifdef TWO_FILE_COMMANDLINE 54 fprintf(stderr, "inputfile outputfile\n"); 55 #else 56 fprintf(stderr, "[inputfile]\n"); 57 #endif 58 59 fprintf(stderr, "Switches (names may be abbreviated):\n"); 60 fprintf(stderr, " -copy none Copy no extra markers from source file\n"); 61 fprintf(stderr, " -copy comments Copy only comment markers (default)\n"); 62 fprintf(stderr, " -copy all Copy all extra markers\n"); 63 #ifdef ENTROPY_OPT_SUPPORTED 64 fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n"); 65 #endif 66 #ifdef C_PROGRESSIVE_SUPPORTED 67 fprintf(stderr, " -progressive Create progressive JPEG file\n"); 68 #endif 69 fprintf(stderr, "Switches for modifying the image:\n"); 70 #if TRANSFORMS_SUPPORTED 71 fprintf(stderr, " -crop WxH+X+Y Crop to a rectangular subarea\n"); 72 fprintf(stderr, " -grayscale Reduce to grayscale (omit color data)\n"); 73 fprintf(stderr, " -flip [horizontal|vertical] Mirror image (left-right or top-bottom)\n"); 74 fprintf(stderr, " -perfect Fail if there is non-transformable edge blocks\n"); 75 fprintf(stderr, " -rotate [90|180|270] Rotate image (degrees clockwise)\n"); 76 #endif 77 #if TRANSFORMS_SUPPORTED 78 fprintf(stderr, " -transpose Transpose image\n"); 79 fprintf(stderr, " -transverse Transverse transpose image\n"); 80 fprintf(stderr, " -trim Drop non-transformable edge blocks\n"); 81 #endif 82 fprintf(stderr, "Switches for advanced users:\n"); 83 #ifdef C_ARITH_CODING_SUPPORTED 84 fprintf(stderr, " -arithmetic Use arithmetic coding\n"); 85 #endif 86 fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n"); 87 fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n"); 88 fprintf(stderr, " -outfile name Specify name for output file\n"); 89 fprintf(stderr, " -verbose or -debug Emit debug output\n"); 90 fprintf(stderr, " -version Print version information and exit\n"); 91 fprintf(stderr, "Switches for wizards:\n"); 92 #ifdef C_MULTISCAN_FILES_SUPPORTED 93 fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n"); 94 #endif 95 exit(EXIT_FAILURE); 96 } 97 98 99 LOCAL(void) 100 select_transform (JXFORM_CODE transform) 101 /* Silly little routine to detect multiple transform options, 102 * which we can't handle. 103 */ 104 { 105 #if TRANSFORMS_SUPPORTED 106 if (transformoption.transform == JXFORM_NONE || 107 transformoption.transform == transform) { 108 transformoption.transform = transform; 109 } else { 110 fprintf(stderr, "%s: can only do one image transformation at a time\n", 111 progname); 112 usage(); 113 } 114 #else 115 fprintf(stderr, "%s: sorry, image transformation was not compiled\n", 116 progname); 117 exit(EXIT_FAILURE); 118 #endif 119 } 120 121 122 LOCAL(int) 123 parse_switches (j_compress_ptr cinfo, int argc, char **argv, 124 int last_file_arg_seen, boolean for_real) 125 /* Parse optional switches. 126 * Returns argv[] index of first file-name argument (== argc if none). 127 * Any file names with indexes <= last_file_arg_seen are ignored; 128 * they have presumably been processed in a previous iteration. 129 * (Pass 0 for last_file_arg_seen on the first or only iteration.) 130 * for_real is FALSE on the first (dummy) pass; we may skip any expensive 131 * processing. 132 */ 133 { 134 int argn; 135 char *arg; 136 boolean simple_progressive; 137 char *scansarg = NULL; /* saves -scans parm if any */ 138 139 /* Set up default JPEG parameters. */ 140 simple_progressive = FALSE; 141 outfilename = NULL; 142 copyoption = JCOPYOPT_DEFAULT; 143 transformoption.transform = JXFORM_NONE; 144 transformoption.perfect = FALSE; 145 transformoption.trim = FALSE; 146 transformoption.force_grayscale = FALSE; 147 transformoption.crop = FALSE; 148 transformoption.slow_hflip = FALSE; 149 cinfo->err->trace_level = 0; 150 151 /* Scan command line options, adjust parameters */ 152 153 for (argn = 1; argn < argc; argn++) { 154 arg = argv[argn]; 155 if (*arg != '-') { 156 /* Not a switch, must be a file name argument */ 157 if (argn <= last_file_arg_seen) { 158 outfilename = NULL; /* -outfile applies to just one input file */ 159 continue; /* ignore this name if previously processed */ 160 } 161 break; /* else done parsing switches */ 162 } 163 arg++; /* advance past switch marker character */ 164 165 if (keymatch(arg, "arithmetic", 1)) { 166 /* Use arithmetic coding. */ 167 #ifdef C_ARITH_CODING_SUPPORTED 168 cinfo->arith_code = TRUE; 169 #else 170 fprintf(stderr, "%s: sorry, arithmetic coding not supported\n", 171 progname); 172 exit(EXIT_FAILURE); 173 #endif 174 175 } else if (keymatch(arg, "copy", 2)) { 176 /* Select which extra markers to copy. */ 177 if (++argn >= argc) /* advance to next argument */ 178 usage(); 179 if (keymatch(argv[argn], "none", 1)) { 180 copyoption = JCOPYOPT_NONE; 181 } else if (keymatch(argv[argn], "comments", 1)) { 182 copyoption = JCOPYOPT_COMMENTS; 183 } else if (keymatch(argv[argn], "all", 1)) { 184 copyoption = JCOPYOPT_ALL; 185 } else 186 usage(); 187 188 } else if (keymatch(arg, "crop", 2)) { 189 /* Perform lossless cropping. */ 190 #if TRANSFORMS_SUPPORTED 191 if (++argn >= argc) /* advance to next argument */ 192 usage(); 193 if (! jtransform_parse_crop_spec(&transformoption, argv[argn])) { 194 fprintf(stderr, "%s: bogus -crop argument '%s'\n", 195 progname, argv[argn]); 196 exit(EXIT_FAILURE); 197 } 198 #else 199 select_transform(JXFORM_NONE); /* force an error */ 200 #endif 201 202 } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) { 203 /* Enable debug printouts. */ 204 /* On first -d, print version identification */ 205 static boolean printed_version = FALSE; 206 207 if (! printed_version) { 208 fprintf(stderr, "%s version %s (build %s)\n", 209 PACKAGE_NAME, VERSION, BUILD); 210 fprintf(stderr, "%s\n\n", JCOPYRIGHT); 211 fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n", 212 JVERSION); 213 printed_version = TRUE; 214 } 215 cinfo->err->trace_level++; 216 217 } else if (keymatch(arg, "version", 4)) { 218 fprintf(stderr, "%s version %s (build %s)\n", 219 PACKAGE_NAME, VERSION, BUILD); 220 exit(EXIT_SUCCESS); 221 222 } else if (keymatch(arg, "flip", 1)) { 223 /* Mirror left-right or top-bottom. */ 224 if (++argn >= argc) /* advance to next argument */ 225 usage(); 226 if (keymatch(argv[argn], "horizontal", 1)) 227 select_transform(JXFORM_FLIP_H); 228 else if (keymatch(argv[argn], "vertical", 1)) 229 select_transform(JXFORM_FLIP_V); 230 else 231 usage(); 232 233 } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) { 234 /* Force to grayscale. */ 235 #if TRANSFORMS_SUPPORTED 236 transformoption.force_grayscale = TRUE; 237 #else 238 select_transform(JXFORM_NONE); /* force an error */ 239 #endif 240 241 } else if (keymatch(arg, "maxmemory", 3)) { 242 /* Maximum memory in Kb (or Mb with 'm'). */ 243 long lval; 244 char ch = 'x'; 245 246 if (++argn >= argc) /* advance to next argument */ 247 usage(); 248 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) 249 usage(); 250 if (ch == 'm' || ch == 'M') 251 lval *= 1000L; 252 cinfo->mem->max_memory_to_use = lval * 1000L; 253 254 } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) { 255 /* Enable entropy parm optimization. */ 256 #ifdef ENTROPY_OPT_SUPPORTED 257 cinfo->optimize_coding = TRUE; 258 #else 259 fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n", 260 progname); 261 exit(EXIT_FAILURE); 262 #endif 263 264 } else if (keymatch(arg, "outfile", 4)) { 265 /* Set output file name. */ 266 if (++argn >= argc) /* advance to next argument */ 267 usage(); 268 outfilename = argv[argn]; /* save it away for later use */ 269 270 } else if (keymatch(arg, "perfect", 2)) { 271 /* Fail if there is any partial edge MCUs that the transform can't 272 * handle. */ 273 transformoption.perfect = TRUE; 274 275 } else if (keymatch(arg, "progressive", 2)) { 276 /* Select simple progressive mode. */ 277 #ifdef C_PROGRESSIVE_SUPPORTED 278 simple_progressive = TRUE; 279 /* We must postpone execution until num_components is known. */ 280 #else 281 fprintf(stderr, "%s: sorry, progressive output was not compiled\n", 282 progname); 283 exit(EXIT_FAILURE); 284 #endif 285 286 } else if (keymatch(arg, "restart", 1)) { 287 /* Restart interval in MCU rows (or in MCUs with 'b'). */ 288 long lval; 289 char ch = 'x'; 290 291 if (++argn >= argc) /* advance to next argument */ 292 usage(); 293 if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) 294 usage(); 295 if (lval < 0 || lval > 65535L) 296 usage(); 297 if (ch == 'b' || ch == 'B') { 298 cinfo->restart_interval = (unsigned int) lval; 299 cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */ 300 } else { 301 cinfo->restart_in_rows = (int) lval; 302 /* restart_interval will be computed during startup */ 303 } 304 305 } else if (keymatch(arg, "rotate", 2)) { 306 /* Rotate 90, 180, or 270 degrees (measured clockwise). */ 307 if (++argn >= argc) /* advance to next argument */ 308 usage(); 309 if (keymatch(argv[argn], "90", 2)) 310 select_transform(JXFORM_ROT_90); 311 else if (keymatch(argv[argn], "180", 3)) 312 select_transform(JXFORM_ROT_180); 313 else if (keymatch(argv[argn], "270", 3)) 314 select_transform(JXFORM_ROT_270); 315 else 316 usage(); 317 318 } else if (keymatch(arg, "scans", 1)) { 319 /* Set scan script. */ 320 #ifdef C_MULTISCAN_FILES_SUPPORTED 321 if (++argn >= argc) /* advance to next argument */ 322 usage(); 323 scansarg = argv[argn]; 324 /* We must postpone reading the file in case -progressive appears. */ 325 #else 326 fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n", 327 progname); 328 exit(EXIT_FAILURE); 329 #endif 330 331 } else if (keymatch(arg, "transpose", 1)) { 332 /* Transpose (across UL-to-LR axis). */ 333 select_transform(JXFORM_TRANSPOSE); 334 335 } else if (keymatch(arg, "transverse", 6)) { 336 /* Transverse transpose (across UR-to-LL axis). */ 337 select_transform(JXFORM_TRANSVERSE); 338 339 } else if (keymatch(arg, "trim", 3)) { 340 /* Trim off any partial edge MCUs that the transform can't handle. */ 341 transformoption.trim = TRUE; 342 343 } else { 344 usage(); /* bogus switch */ 345 } 346 } 347 348 /* Post-switch-scanning cleanup */ 349 350 if (for_real) { 351 352 #ifdef C_PROGRESSIVE_SUPPORTED 353 if (simple_progressive) /* process -progressive; -scans can override */ 354 jpeg_simple_progression(cinfo); 355 #endif 356 357 #ifdef C_MULTISCAN_FILES_SUPPORTED 358 if (scansarg != NULL) /* process -scans if it was present */ 359 if (! read_scan_script(cinfo, scansarg)) 360 usage(); 361 #endif 362 } 363 364 return argn; /* return index of next arg (file name) */ 365 } 366 367 368 /* 369 * The main program. 370 */ 371 372 int 373 main (int argc, char **argv) 374 { 375 struct jpeg_decompress_struct srcinfo; 376 struct jpeg_compress_struct dstinfo; 377 struct jpeg_error_mgr jsrcerr, jdsterr; 378 #ifdef PROGRESS_REPORT 379 struct cdjpeg_progress_mgr progress; 380 #endif 381 jvirt_barray_ptr *src_coef_arrays; 382 jvirt_barray_ptr *dst_coef_arrays; 383 int file_index; 384 /* We assume all-in-memory processing and can therefore use only a 385 * single file pointer for sequential input and output operation. 386 */ 387 FILE *fp; 388 389 /* On Mac, fetch a command line. */ 390 #ifdef USE_CCOMMAND 391 argc = ccommand(&argv); 392 #endif 393 394 progname = argv[0]; 395 if (progname == NULL || progname[0] == 0) 396 progname = "jpegtran"; /* in case C library doesn't provide it */ 397 398 /* Initialize the JPEG decompression object with default error handling. */ 399 srcinfo.err = jpeg_std_error(&jsrcerr); 400 jpeg_create_decompress(&srcinfo); 401 /* Initialize the JPEG compression object with default error handling. */ 402 dstinfo.err = jpeg_std_error(&jdsterr); 403 jpeg_create_compress(&dstinfo); 404 405 /* Scan command line to find file names. 406 * It is convenient to use just one switch-parsing routine, but the switch 407 * values read here are mostly ignored; we will rescan the switches after 408 * opening the input file. Also note that most of the switches affect the 409 * destination JPEG object, so we parse into that and then copy over what 410 * needs to affects the source too. 411 */ 412 413 file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE); 414 jsrcerr.trace_level = jdsterr.trace_level; 415 srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use; 416 417 #ifdef TWO_FILE_COMMANDLINE 418 /* Must have either -outfile switch or explicit output file name */ 419 if (outfilename == NULL) { 420 if (file_index != argc-2) { 421 fprintf(stderr, "%s: must name one input and one output file\n", 422 progname); 423 usage(); 424 } 425 outfilename = argv[file_index+1]; 426 } else { 427 if (file_index != argc-1) { 428 fprintf(stderr, "%s: must name one input and one output file\n", 429 progname); 430 usage(); 431 } 432 } 433 #else 434 /* Unix style: expect zero or one file name */ 435 if (file_index < argc-1) { 436 fprintf(stderr, "%s: only one input file\n", progname); 437 usage(); 438 } 439 #endif /* TWO_FILE_COMMANDLINE */ 440 441 /* Open the input file. */ 442 if (file_index < argc) { 443 if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) { 444 fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]); 445 exit(EXIT_FAILURE); 446 } 447 } else { 448 /* default input file is stdin */ 449 fp = read_stdin(); 450 } 451 452 #ifdef PROGRESS_REPORT 453 start_progress_monitor((j_common_ptr) &dstinfo, &progress); 454 #endif 455 456 /* Specify data source for decompression */ 457 jpeg_stdio_src(&srcinfo, fp); 458 459 /* Enable saving of extra markers that we want to copy */ 460 jcopy_markers_setup(&srcinfo, copyoption); 461 462 /* Read file header */ 463 (void) jpeg_read_header(&srcinfo, TRUE); 464 465 /* Any space needed by a transform option must be requested before 466 * jpeg_read_coefficients so that memory allocation will be done right. 467 */ 468 #if TRANSFORMS_SUPPORTED 469 /* Fail right away if -perfect is given and transformation is not perfect. 470 */ 471 if (!jtransform_request_workspace(&srcinfo, &transformoption)) { 472 fprintf(stderr, "%s: transformation is not perfect\n", progname); 473 exit(EXIT_FAILURE); 474 } 475 #endif 476 477 /* Read source file as DCT coefficients */ 478 src_coef_arrays = jpeg_read_coefficients(&srcinfo); 479 480 /* Initialize destination compression parameters from source values */ 481 jpeg_copy_critical_parameters(&srcinfo, &dstinfo); 482 483 /* Adjust destination parameters if required by transform options; 484 * also find out which set of coefficient arrays will hold the output. 485 */ 486 #if TRANSFORMS_SUPPORTED 487 dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo, 488 src_coef_arrays, 489 &transformoption); 490 #else 491 dst_coef_arrays = src_coef_arrays; 492 #endif 493 494 /* Close input file, if we opened it. 495 * Note: we assume that jpeg_read_coefficients consumed all input 496 * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will 497 * only consume more while (! cinfo->inputctl->eoi_reached). 498 * We cannot call jpeg_finish_decompress here since we still need the 499 * virtual arrays allocated from the source object for processing. 500 */ 501 if (fp != stdin) 502 fclose(fp); 503 504 /* Open the output file. */ 505 if (outfilename != NULL) { 506 if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) { 507 fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename); 508 exit(EXIT_FAILURE); 509 } 510 } else { 511 /* default output file is stdout */ 512 fp = write_stdout(); 513 } 514 515 /* Adjust default compression parameters by re-parsing the options */ 516 file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE); 517 518 /* Specify data destination for compression */ 519 jpeg_stdio_dest(&dstinfo, fp); 520 521 /* Start compressor (note no image data is actually written here) */ 522 jpeg_write_coefficients(&dstinfo, dst_coef_arrays); 523 524 /* Copy to the output file any extra markers that we want to preserve */ 525 jcopy_markers_execute(&srcinfo, &dstinfo, copyoption); 526 527 /* Execute image transformation, if any */ 528 #if TRANSFORMS_SUPPORTED 529 jtransform_execute_transformation(&srcinfo, &dstinfo, 530 src_coef_arrays, 531 &transformoption); 532 #endif 533 534 /* Finish compression and release memory */ 535 jpeg_finish_compress(&dstinfo); 536 jpeg_destroy_compress(&dstinfo); 537 (void) jpeg_finish_decompress(&srcinfo); 538 jpeg_destroy_decompress(&srcinfo); 539 540 /* Close output file, if we opened it */ 541 if (fp != stdout) 542 fclose(fp); 543 544 #ifdef PROGRESS_REPORT 545 end_progress_monitor((j_common_ptr) &dstinfo); 546 #endif 547 548 /* All done. */ 549 exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS); 550 return 0; /* suppress no-return-value warnings */ 551 } 552
