/* * jpegtran.c * * This file was part of the Independent JPEG Group's software: * Copyright (C) 1995-2019, Thomas G. Lane, Guido Vollbeding. * libjpeg-turbo Modifications: * Copyright (C) 2010, 2014, 2017, 2019-2022, D. R. Commander. * mozjpeg Modifications: * Copyright (C) 2014, Mozilla Corporation. * For conditions of distribution and use, see the accompanying README file. * * This file contains a command-line user interface for JPEG transcoding. * It is very similar to cjpeg.c, and partly to djpeg.c, but provides * lossless transcoding between different JPEG file formats. It also * provides some lossless and sort-of-lossless transformations of JPEG data. */ #ifdef _MSC_VER #define _CRT_SECURE_NO_DEPRECATE #endif #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ #include "transupp.h" /* Support routines for jpegtran */ #include "jversion.h" /* for version message */ #include "jconfigint.h" /* * Argument-parsing code. * The switch parser is designed to be useful with DOS-style command line * syntax, ie, intermixed switches and file names, where only the switches * to the left of a given file name affect processing of that file. * The main program in this file doesn't actually use this capability... */ static const char *progname; /* program name for error messages */ static char *icc_filename; /* for -icc switch */ JDIMENSION max_scans; /* for -maxscans switch */ static char *outfilename; /* for -outfile switch */ static char *dropfilename; /* for -drop switch */ boolean report; /* for -report switch */ boolean strict; /* for -strict switch */ static boolean prefer_smallest; /* use smallest of input or result file (if no image-changing options supplied) */ static JCOPY_OPTION copyoption; /* -copy switch */ static jpeg_transform_info transformoption; /* image transformation options */ boolean memsrc = FALSE; /* for -memsrc switch */ #define INPUT_BUF_SIZE 4096 LOCAL(void) usage(void) /* complain about bad command line */ { fprintf(stderr, "usage: %s [switches] ", progname); #ifdef TWO_FILE_COMMANDLINE fprintf(stderr, "inputfile outputfile\n"); #else fprintf(stderr, "[inputfile]\n"); #endif fprintf(stderr, "Switches (names may be abbreviated):\n"); fprintf(stderr, " -copy none Copy no extra markers from source file\n"); fprintf(stderr, " -copy comments Copy only comment markers (default)\n"); fprintf(stderr, " -copy icc Copy only ICC profile markers\n"); fprintf(stderr, " -copy all Copy all extra markers\n"); #ifdef ENTROPY_OPT_SUPPORTED fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression, enabled by default)\n"); #endif #ifdef C_PROGRESSIVE_SUPPORTED fprintf(stderr, " -progressive Create progressive JPEG file (enabled by default)\n"); #endif fprintf(stderr, " -revert Revert to standard defaults (instead of mozjpeg defaults)\n"); fprintf(stderr, " -fastcrush Disable progressive scan optimization\n"); fprintf(stderr, "Switches for modifying the image:\n"); #if TRANSFORMS_SUPPORTED fprintf(stderr, " -crop WxH+X+Y Crop to a rectangular region\n"); fprintf(stderr, " -drop +X+Y filename Drop (insert) another image\n"); fprintf(stderr, " -flip [horizontal|vertical] Mirror image (left-right or top-bottom)\n"); fprintf(stderr, " -grayscale Reduce to grayscale (omit color data)\n"); fprintf(stderr, " -perfect Fail if there is non-transformable edge blocks\n"); fprintf(stderr, " -rotate [90|180|270] Rotate image (degrees clockwise)\n"); #endif #if TRANSFORMS_SUPPORTED fprintf(stderr, " -transpose Transpose image\n"); fprintf(stderr, " -transverse Transverse transpose image\n"); fprintf(stderr, " -trim Drop non-transformable edge blocks\n"); fprintf(stderr, " with -drop: Requantize drop file to match source file\n"); fprintf(stderr, " -wipe WxH+X+Y Wipe (gray out) a rectangular region\n"); #endif fprintf(stderr, "Switches for advanced users:\n"); #ifdef C_ARITH_CODING_SUPPORTED fprintf(stderr, " -arithmetic Use arithmetic coding\n"); #endif fprintf(stderr, " -icc FILE Embed ICC profile contained in FILE\n"); fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n"); fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n"); fprintf(stderr, " -maxscans N Maximum number of scans to allow in input file\n"); fprintf(stderr, " -outfile name Specify name for output file\n"); fprintf(stderr, " -report Report transformation progress\n"); fprintf(stderr, " -strict Treat all warnings as fatal\n"); fprintf(stderr, " -verbose or -debug Emit debug output\n"); fprintf(stderr, " -version Print version information and exit\n"); fprintf(stderr, "Switches for wizards:\n"); #ifdef C_MULTISCAN_FILES_SUPPORTED fprintf(stderr, " -scans FILE Create multi-scan JPEG per script FILE\n"); #endif exit(EXIT_FAILURE); } LOCAL(void) select_transform(JXFORM_CODE transform) /* Silly little routine to detect multiple transform options, * which we can't handle. */ { #if TRANSFORMS_SUPPORTED if (transformoption.transform == JXFORM_NONE || transformoption.transform == transform) { transformoption.transform = transform; } else { fprintf(stderr, "%s: can only do one image transformation at a time\n", progname); usage(); } #else fprintf(stderr, "%s: sorry, image transformation was not compiled\n", progname); exit(EXIT_FAILURE); #endif } LOCAL(int) parse_switches(j_compress_ptr cinfo, int argc, char **argv, int last_file_arg_seen, boolean for_real) /* Parse optional switches. * Returns argv[] index of first file-name argument (== argc if none). * Any file names with indexes <= last_file_arg_seen are ignored; * they have presumably been processed in a previous iteration. * (Pass 0 for last_file_arg_seen on the first or only iteration.) * for_real is FALSE on the first (dummy) pass; we may skip any expensive * processing. */ { int argn; char *arg; boolean simple_progressive; char *scansarg = NULL; /* saves -scans parm if any */ /* Set up default JPEG parameters. */ #ifdef C_PROGRESSIVE_SUPPORTED simple_progressive = cinfo->num_scans == 0 ? FALSE : TRUE; #else simple_progressive = FALSE; #endif icc_filename = NULL; max_scans = 0; outfilename = NULL; report = FALSE; strict = FALSE; copyoption = JCOPYOPT_DEFAULT; transformoption.transform = JXFORM_NONE; transformoption.perfect = FALSE; transformoption.trim = FALSE; transformoption.force_grayscale = FALSE; transformoption.crop = FALSE; transformoption.slow_hflip = FALSE; cinfo->err->trace_level = 0; prefer_smallest = TRUE; /* Scan command line options, adjust parameters */ for (argn = 1; argn < argc; argn++) { arg = argv[argn]; if (*arg != '-') { /* Not a switch, must be a file name argument */ if (argn <= last_file_arg_seen) { outfilename = NULL; /* -outfile applies to just one input file */ continue; /* ignore this name if previously processed */ } break; /* else done parsing switches */ } arg++; /* advance past switch marker character */ if (keymatch(arg, "arithmetic", 1)) { /* Use arithmetic coding. */ #ifdef C_ARITH_CODING_SUPPORTED cinfo->arith_code = TRUE; /* No table optimization required for AC */ cinfo->optimize_coding = FALSE; prefer_smallest = FALSE; #else fprintf(stderr, "%s: sorry, arithmetic coding not supported\n", progname); exit(EXIT_FAILURE); #endif } else if (keymatch(arg, "copy", 2)) { /* Select which extra markers to copy. */ if (++argn >= argc) /* advance to next argument */ usage(); if (keymatch(argv[argn], "none", 1)) { copyoption = JCOPYOPT_NONE; } else if (keymatch(argv[argn], "comments", 1)) { copyoption = JCOPYOPT_COMMENTS; } else if (keymatch(argv[argn], "icc", 1)) { copyoption = JCOPYOPT_ICC; } else if (keymatch(argv[argn], "all", 1)) { copyoption = JCOPYOPT_ALL; } else usage(); } else if (keymatch(arg, "crop", 2)) { /* Perform lossless cropping. */ #if TRANSFORMS_SUPPORTED if (++argn >= argc) /* advance to next argument */ usage(); if (transformoption.crop /* reject multiple crop/drop/wipe requests */ || !jtransform_parse_crop_spec(&transformoption, argv[argn])) { fprintf(stderr, "%s: bogus -crop argument '%s'\n", progname, argv[argn]); exit(EXIT_FAILURE); } prefer_smallest = FALSE; #else select_transform(JXFORM_NONE); /* force an error */ #endif } else if (keymatch(arg, "drop", 2)) { #if TRANSFORMS_SUPPORTED if (++argn >= argc) /* advance to next argument */ usage(); if (transformoption.crop /* reject multiple crop/drop/wipe requests */ || !jtransform_parse_crop_spec(&transformoption, argv[argn]) || transformoption.crop_width_set != JCROP_UNSET || transformoption.crop_height_set != JCROP_UNSET) { fprintf(stderr, "%s: bogus -drop argument '%s'\n", progname, argv[argn]); exit(EXIT_FAILURE); } if (++argn >= argc) /* advance to next argument */ usage(); dropfilename = argv[argn]; select_transform(JXFORM_DROP); #else select_transform(JXFORM_NONE); /* force an error */ #endif } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) { /* Enable debug printouts. */ /* On first -d, print version identification */ static boolean printed_version = FALSE; if (!printed_version) { fprintf(stderr, "%s version %s (build %s)\n", PACKAGE_NAME, VERSION, BUILD); fprintf(stderr, "%s\n\n", JCOPYRIGHT); fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n", JVERSION); printed_version = TRUE; } cinfo->err->trace_level++; } else if (keymatch(arg, "version", 4)) { fprintf(stderr, "%s version %s (build %s)\n", PACKAGE_NAME, VERSION, BUILD); exit(EXIT_SUCCESS); } else if (keymatch(arg, "flip", 1)) { /* Mirror left-right or top-bottom. */ if (++argn >= argc) /* advance to next argument */ usage(); if (keymatch(argv[argn], "horizontal", 1)) select_transform(JXFORM_FLIP_H); else if (keymatch(argv[argn], "vertical", 1)) select_transform(JXFORM_FLIP_V); else usage(); prefer_smallest = FALSE; } else if (keymatch(arg, "fastcrush", 4)) { jpeg_c_set_bool_param(cinfo, JBOOLEAN_OPTIMIZE_SCANS, FALSE); } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) { /* Force to grayscale. */ #if TRANSFORMS_SUPPORTED transformoption.force_grayscale = TRUE; prefer_smallest = FALSE; #else select_transform(JXFORM_NONE); /* force an error */ #endif } else if (keymatch(arg, "icc", 1)) { /* Set ICC filename. */ if (++argn >= argc) /* advance to next argument */ usage(); icc_filename = argv[argn]; } else if (keymatch(arg, "maxmemory", 3)) { /* Maximum memory in Kb (or Mb with 'm'). */ long lval; char ch = 'x'; if (++argn >= argc) /* advance to next argument */ usage(); if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) usage(); if (ch == 'm' || ch == 'M') lval *= 1000L; cinfo->mem->max_memory_to_use = lval * 1000L; } else if (keymatch(arg, "maxscans", 4)) { if (++argn >= argc) /* advance to next argument */ usage(); if (sscanf(argv[argn], "%u", &max_scans) != 1) usage(); } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) { /* Enable entropy parm optimization. */ #ifdef ENTROPY_OPT_SUPPORTED cinfo->optimize_coding = TRUE; #else fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n", progname); exit(EXIT_FAILURE); #endif } else if (keymatch(arg, "outfile", 4)) { /* Set output file name. */ if (++argn >= argc) /* advance to next argument */ usage(); outfilename = argv[argn]; /* save it away for later use */ } else if (keymatch(arg, "perfect", 2)) { /* Fail if there is any partial edge MCUs that the transform can't * handle. */ transformoption.perfect = TRUE; } else if (keymatch(arg, "progressive", 2)) { /* Select simple progressive mode. */ #ifdef C_PROGRESSIVE_SUPPORTED simple_progressive = TRUE; prefer_smallest = FALSE; /* We must postpone execution until num_components is known. */ #else fprintf(stderr, "%s: sorry, progressive output was not compiled\n", progname); exit(EXIT_FAILURE); #endif } else if (keymatch(arg, "report", 3)) { report = TRUE; } else if (keymatch(arg, "restart", 1)) { /* Restart interval in MCU rows (or in MCUs with 'b'). */ long lval; char ch = 'x'; if (++argn >= argc) /* advance to next argument */ usage(); if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) usage(); if (lval < 0 || lval > 65535L) usage(); if (ch == 'b' || ch == 'B') { cinfo->restart_interval = (unsigned int)lval; cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */ } else { cinfo->restart_in_rows = (int)lval; /* restart_interval will be computed during startup */ } } else if (keymatch(arg, "revert", 3)) { /* revert to old JPEG default */ jpeg_c_set_int_param(cinfo, JINT_COMPRESS_PROFILE, JCP_FASTEST); prefer_smallest = FALSE; } else if (keymatch(arg, "rotate", 2)) { /* Rotate 90, 180, or 270 degrees (measured clockwise). */ if (++argn >= argc) /* advance to next argument */ usage(); if (keymatch(argv[argn], "90", 2)) select_transform(JXFORM_ROT_90); else if (keymatch(argv[argn], "180", 3)) select_transform(JXFORM_ROT_180); else if (keymatch(argv[argn], "270", 3)) select_transform(JXFORM_ROT_270); else usage(); prefer_smallest = FALSE; } else if (keymatch(arg, "scans", 1)) { /* Set scan script. */ #ifdef C_MULTISCAN_FILES_SUPPORTED if (++argn >= argc) /* advance to next argument */ usage(); prefer_smallest = FALSE; scansarg = argv[argn]; /* We must postpone reading the file in case -progressive appears. */ #else fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n", progname); exit(EXIT_FAILURE); #endif } else if (keymatch(arg, "strict", 2)) { strict = TRUE; } else if (keymatch(arg, "transpose", 1)) { /* Transpose (across UL-to-LR axis). */ select_transform(JXFORM_TRANSPOSE); prefer_smallest = FALSE; } else if (keymatch(arg, "transverse", 6)) { /* Transverse transpose (across UR-to-LL axis). */ select_transform(JXFORM_TRANSVERSE); prefer_smallest = FALSE; } else if (keymatch(arg, "trim", 3)) { /* Trim off any partial edge MCUs that the transform can't handle. */ transformoption.trim = TRUE; prefer_smallest = FALSE; } else if (keymatch(arg, "wipe", 1)) { #if TRANSFORMS_SUPPORTED if (++argn >= argc) /* advance to next argument */ usage(); if (transformoption.crop /* reject multiple crop/drop/wipe requests */ || !jtransform_parse_crop_spec(&transformoption, argv[argn])) { fprintf(stderr, "%s: bogus -wipe argument '%s'\n", progname, argv[argn]); exit(EXIT_FAILURE); } select_transform(JXFORM_WIPE); #else select_transform(JXFORM_NONE); /* force an error */ #endif } else { usage(); /* bogus switch */ } } /* Post-switch-scanning cleanup */ if (for_real) { #ifdef C_PROGRESSIVE_SUPPORTED if (simple_progressive) /* process -progressive; -scans can override */ jpeg_simple_progression(cinfo); #endif #ifdef C_MULTISCAN_FILES_SUPPORTED if (scansarg != NULL) /* process -scans if it was present */ if (!read_scan_script(cinfo, scansarg)) usage(); #endif } return argn; /* return index of next arg (file name) */ } METHODDEF(void) my_emit_message(j_common_ptr cinfo, int msg_level) { if (msg_level < 0) { /* Treat warning as fatal */ cinfo->err->error_exit(cinfo); } else { if (cinfo->err->trace_level >= msg_level) cinfo->err->output_message(cinfo); } } /* * The main program. */ int main(int argc, char **argv) { struct jpeg_decompress_struct srcinfo; #if TRANSFORMS_SUPPORTED struct jpeg_decompress_struct dropinfo; struct jpeg_error_mgr jdroperr; FILE *drop_file; #endif struct jpeg_compress_struct dstinfo; struct jpeg_error_mgr jsrcerr, jdsterr; struct cdjpeg_progress_mgr src_progress, dst_progress; jvirt_barray_ptr *src_coef_arrays; jvirt_barray_ptr *dst_coef_arrays; int file_index; /* We assume all-in-memory processing and can therefore use only a * single file pointer for sequential input and output operation. */ FILE *fp; unsigned char *inbuffer = NULL; unsigned long insize = 0; unsigned char *outbuffer = NULL; unsigned long outsize = 0; FILE *icc_file; JOCTET *icc_profile = NULL; long icc_len = 0; progname = argv[0]; if (progname == NULL || progname[0] == 0) progname = "jpegtran"; /* in case C library doesn't provide it */ /* Initialize the JPEG decompression object with default error handling. */ srcinfo.err = jpeg_std_error(&jsrcerr); jpeg_create_decompress(&srcinfo); /* Initialize the JPEG compression object with default error handling. */ dstinfo.err = jpeg_std_error(&jdsterr); jpeg_create_compress(&dstinfo); /* Scan command line to find file names. * It is convenient to use just one switch-parsing routine, but the switch * values read here are mostly ignored; we will rescan the switches after * opening the input file. Also note that most of the switches affect the * destination JPEG object, so we parse into that and then copy over what * needs to affect the source too. */ file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE); jsrcerr.trace_level = jdsterr.trace_level; srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use; if (strict) jsrcerr.emit_message = my_emit_message; #ifdef TWO_FILE_COMMANDLINE /* Must have either -outfile switch or explicit output file name */ if (outfilename == NULL) { if (file_index != argc - 2) { fprintf(stderr, "%s: must name one input and one output file\n", progname); usage(); } outfilename = argv[file_index + 1]; } else { if (file_index != argc - 1) { fprintf(stderr, "%s: must name one input and one output file\n", progname); usage(); } } #else /* Unix style: expect zero or one file name */ if (file_index < argc - 1) { fprintf(stderr, "%s: only one input file\n", progname); usage(); } #endif /* TWO_FILE_COMMANDLINE */ /* Open the input file. */ if (file_index < argc) { if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) { fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]); exit(EXIT_FAILURE); } } else { /* default input file is stdin */ fp = read_stdin(); } if (icc_filename != NULL) { if ((icc_file = fopen(icc_filename, READ_BINARY)) == NULL) { fprintf(stderr, "%s: can't open %s\n", progname, icc_filename); exit(EXIT_FAILURE); } if (fseek(icc_file, 0, SEEK_END) < 0 || (icc_len = ftell(icc_file)) < 1 || fseek(icc_file, 0, SEEK_SET) < 0) { fprintf(stderr, "%s: can't determine size of %s\n", progname, icc_filename); exit(EXIT_FAILURE); } if ((icc_profile = (JOCTET *)malloc(icc_len)) == NULL) { fprintf(stderr, "%s: can't allocate memory for ICC profile\n", progname); fclose(icc_file); exit(EXIT_FAILURE); } if (fread(icc_profile, icc_len, 1, icc_file) < 1) { fprintf(stderr, "%s: can't read ICC profile from %s\n", progname, icc_filename); free(icc_profile); fclose(icc_file); exit(EXIT_FAILURE); } fclose(icc_file); if (copyoption == JCOPYOPT_ALL) copyoption = JCOPYOPT_ALL_EXCEPT_ICC; if (copyoption == JCOPYOPT_ICC) copyoption = JCOPYOPT_NONE; } if (report) { start_progress_monitor((j_common_ptr)&dstinfo, &dst_progress); dst_progress.report = report; } if (report || max_scans != 0) { start_progress_monitor((j_common_ptr)&srcinfo, &src_progress); src_progress.report = report; src_progress.max_scans = max_scans; } #if TRANSFORMS_SUPPORTED /* Open the drop file. */ if (dropfilename != NULL) { if ((drop_file = fopen(dropfilename, READ_BINARY)) == NULL) { fprintf(stderr, "%s: can't open %s for reading\n", progname, dropfilename); exit(EXIT_FAILURE); } dropinfo.err = jpeg_std_error(&jdroperr); jpeg_create_decompress(&dropinfo); jpeg_stdio_src(&dropinfo, drop_file); } else { drop_file = NULL; } #endif /* Specify data source for decompression */ if (jpeg_c_int_param_supported(&dstinfo, JINT_COMPRESS_PROFILE) && jpeg_c_get_int_param(&dstinfo, JINT_COMPRESS_PROFILE) == JCP_MAX_COMPRESSION) memsrc = TRUE; /* needed to revert to original */ #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) if (memsrc) { size_t nbytes; do { inbuffer = (unsigned char *)realloc(inbuffer, insize + INPUT_BUF_SIZE); if (inbuffer == NULL) { fprintf(stderr, "%s: memory allocation failure\n", progname); exit(EXIT_FAILURE); } nbytes = fread(&inbuffer[insize], 1, INPUT_BUF_SIZE, fp); if (nbytes < INPUT_BUF_SIZE && ferror(fp)) { if (file_index < argc) fprintf(stderr, "%s: can't read from %s\n", progname, argv[file_index]); else fprintf(stderr, "%s: can't read from stdin\n", progname); } insize += (unsigned long)nbytes; } while (nbytes == INPUT_BUF_SIZE); jpeg_mem_src(&srcinfo, inbuffer, insize); } else #endif jpeg_stdio_src(&srcinfo, fp); /* Enable saving of extra markers that we want to copy */ jcopy_markers_setup(&srcinfo, copyoption); /* Read file header */ (void)jpeg_read_header(&srcinfo, TRUE); #if TRANSFORMS_SUPPORTED if (dropfilename != NULL) { (void)jpeg_read_header(&dropinfo, TRUE); transformoption.crop_width = dropinfo.image_width; transformoption.crop_width_set = JCROP_POS; transformoption.crop_height = dropinfo.image_height; transformoption.crop_height_set = JCROP_POS; transformoption.drop_ptr = &dropinfo; } #endif /* Any space needed by a transform option must be requested before * jpeg_read_coefficients so that memory allocation will be done right. */ #if TRANSFORMS_SUPPORTED /* Fail right away if -perfect is given and transformation is not perfect. */ if (!jtransform_request_workspace(&srcinfo, &transformoption)) { fprintf(stderr, "%s: transformation is not perfect\n", progname); exit(EXIT_FAILURE); } #endif /* Read source file as DCT coefficients */ src_coef_arrays = jpeg_read_coefficients(&srcinfo); #if TRANSFORMS_SUPPORTED if (dropfilename != NULL) { transformoption.drop_coef_arrays = jpeg_read_coefficients(&dropinfo); } #endif /* Initialize destination compression parameters from source values */ jpeg_copy_critical_parameters(&srcinfo, &dstinfo); /* Adjust destination parameters if required by transform options; * also find out which set of coefficient arrays will hold the output. */ #if TRANSFORMS_SUPPORTED dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo, src_coef_arrays, &transformoption); #else dst_coef_arrays = src_coef_arrays; #endif /* Close input file, if we opened it. * Note: we assume that jpeg_read_coefficients consumed all input * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will * only consume more while (!cinfo->inputctl->eoi_reached). * We cannot call jpeg_finish_decompress here since we still need the * virtual arrays allocated from the source object for processing. */ if (fp != stdin) fclose(fp); /* Open the output file. */ if (outfilename != NULL) { if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) { fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename); exit(EXIT_FAILURE); } } else { /* default output file is stdout */ fp = write_stdout(); } /* Adjust default compression parameters by re-parsing the options */ file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE); /* Specify data destination for compression */ #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) if (jpeg_c_int_param_supported(&dstinfo, JINT_COMPRESS_PROFILE) && jpeg_c_get_int_param(&dstinfo, JINT_COMPRESS_PROFILE) == JCP_MAX_COMPRESSION) jpeg_mem_dest(&dstinfo, &outbuffer, &outsize); else #endif jpeg_stdio_dest(&dstinfo, fp); /* Start compressor (note no image data is actually written here) */ jpeg_write_coefficients(&dstinfo, dst_coef_arrays); /* Copy to the output file any extra markers that we want to preserve */ jcopy_markers_execute(&srcinfo, &dstinfo, copyoption); if (icc_profile != NULL) jpeg_write_icc_profile(&dstinfo, icc_profile, (unsigned int)icc_len); /* Execute image transformation, if any */ #if TRANSFORMS_SUPPORTED jtransform_execute_transformation(&srcinfo, &dstinfo, src_coef_arrays, &transformoption); #endif /* Finish compression and release memory */ jpeg_finish_compress(&dstinfo); #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) if (jpeg_c_int_param_supported(&dstinfo, JINT_COMPRESS_PROFILE) && jpeg_c_get_int_param(&dstinfo, JINT_COMPRESS_PROFILE) == JCP_MAX_COMPRESSION) { size_t nbytes; unsigned char *buffer = outbuffer; unsigned long size = outsize; if (prefer_smallest && insize < size) { size = insize; buffer = inbuffer; } nbytes = fwrite(buffer, 1, size, fp); if (nbytes < size && ferror(fp)) { if (file_index < argc) fprintf(stderr, "%s: can't write to %s\n", progname, argv[file_index]); else fprintf(stderr, "%s: can't write to stdout\n", progname); } } #endif jpeg_destroy_compress(&dstinfo); (void)jpeg_finish_decompress(&srcinfo); jpeg_destroy_decompress(&srcinfo); #if TRANSFORMS_SUPPORTED if (dropfilename != NULL) { (void)jpeg_finish_decompress(&dropinfo); jpeg_destroy_decompress(&dropinfo); } #endif /* Close output file, if we opened it */ if (fp != stdout) fclose(fp); #if TRANSFORMS_SUPPORTED if (drop_file != NULL) fclose(drop_file); #endif if (report) end_progress_monitor((j_common_ptr)&dstinfo); if (report || max_scans != 0) end_progress_monitor((j_common_ptr)&srcinfo); free(inbuffer); free(outbuffer); free(icc_profile); /* All done. */ #if TRANSFORMS_SUPPORTED if (dropfilename != NULL) exit(jsrcerr.num_warnings + jdroperr.num_warnings + jdsterr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS); #endif exit(jsrcerr.num_warnings + jdsterr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS); return 0; /* suppress no-return-value warnings */ }