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Diffstat (limited to 'src/jpeg-6b/jpegtran.c')
-rw-r--r--src/jpeg-6b/jpegtran.c504
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diff --git a/src/jpeg-6b/jpegtran.c b/src/jpeg-6b/jpegtran.c
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+/*
+ * jpegtran.c
+ *
+ * Copyright (C) 1995-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * 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, but provides lossless transcoding between
+ * different JPEG file formats. It also provides some lossless and sort-of-
+ * lossless transformations of JPEG data.
+ */
+
+#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
+#include "transupp.h" /* Support routines for jpegtran */
+#include "jversion.h" /* for version message */
+
+#ifdef USE_CCOMMAND /* command-line reader for Macintosh */
+#ifdef __MWERKS__
+#include <SIOUX.h> /* Metrowerks needs this */
+#include <console.h> /* ... and this */
+#endif
+#ifdef THINK_C
+#include <console.h> /* Think declares it here */
+#endif
+#endif
+
+
+/*
+ * 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 * outfilename; /* for -outfile switch */
+static JCOPY_OPTION copyoption; /* -copy switch */
+static jpeg_transform_info transformoption; /* image transformation options */
+
+
+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 all Copy all extra markers\n");
+#ifdef ENTROPY_OPT_SUPPORTED
+ fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");
+#endif
+#ifdef C_PROGRESSIVE_SUPPORTED
+ fprintf(stderr, " -progressive Create progressive JPEG file\n");
+#endif
+#if TRANSFORMS_SUPPORTED
+ fprintf(stderr, "Switches for modifying the image:\n");
+ fprintf(stderr, " -grayscale Reduce to grayscale (omit color data)\n");
+ fprintf(stderr, " -flip [horizontal|vertical] Mirror image (left-right or top-bottom)\n");
+ fprintf(stderr, " -rotate [90|180|270] Rotate image (degrees clockwise)\n");
+ fprintf(stderr, " -transpose Transpose image\n");
+ fprintf(stderr, " -transverse Transverse transpose image\n");
+ fprintf(stderr, " -trim Drop non-transformable edge blocks\n");
+#endif /* TRANSFORMS_SUPPORTED */
+ fprintf(stderr, "Switches for advanced users:\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, " -outfile name Specify name for output file\n");
+ fprintf(stderr, " -verbose or -debug Emit debug output\n");
+ fprintf(stderr, "Switches for wizards:\n");
+#ifdef C_ARITH_CODING_SUPPORTED
+ fprintf(stderr, " -arithmetic Use arithmetic coding\n");
+#endif
+#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. */
+ simple_progressive = FALSE;
+ outfilename = NULL;
+ copyoption = JCOPYOPT_DEFAULT;
+ transformoption.transform = JXFORM_NONE;
+ transformoption.trim = FALSE;
+ transformoption.force_grayscale = FALSE;
+ cinfo->err->trace_level = 0;
+
+ /* 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;
+#else
+ fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
+ progname);
+ exit(EXIT_FAILURE);
+#endif
+
+ } else if (keymatch(arg, "copy", 1)) {
+ /* 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], "all", 1)) {
+ copyoption = JCOPYOPT_ALL;
+ } else
+ usage();
+
+ } 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, "Independent JPEG Group's JPEGTRAN, version %s\n%s\n",
+ JVERSION, JCOPYRIGHT);
+ printed_version = TRUE;
+ }
+ cinfo->err->trace_level++;
+
+ } 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();
+
+ } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) {
+ /* Force to grayscale. */
+#if TRANSFORMS_SUPPORTED
+ transformoption.force_grayscale = TRUE;
+#else
+ select_transform(JXFORM_NONE); /* force an error */
+#endif
+
+ } 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, "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, "progressive", 1)) {
+ /* Select simple progressive mode. */
+#ifdef C_PROGRESSIVE_SUPPORTED
+ simple_progressive = TRUE;
+ /* 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, "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, "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();
+
+ } else if (keymatch(arg, "scans", 1)) {
+ /* Set scan script. */
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ 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, "transpose", 1)) {
+ /* Transpose (across UL-to-LR axis). */
+ select_transform(JXFORM_TRANSPOSE);
+
+ } else if (keymatch(arg, "transverse", 6)) {
+ /* Transverse transpose (across UR-to-LL axis). */
+ select_transform(JXFORM_TRANSVERSE);
+
+ } else if (keymatch(arg, "trim", 3)) {
+ /* Trim off any partial edge MCUs that the transform can't handle. */
+ transformoption.trim = TRUE;
+
+ } 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) */
+}
+
+
+/*
+ * The main program.
+ */
+
+int
+main (int argc, char **argv)
+{
+ struct jpeg_decompress_struct srcinfo;
+ struct jpeg_compress_struct dstinfo;
+ struct jpeg_error_mgr jsrcerr, jdsterr;
+#ifdef PROGRESS_REPORT
+ struct cdjpeg_progress_mgr progress;
+#endif
+ jvirt_barray_ptr * src_coef_arrays;
+ jvirt_barray_ptr * dst_coef_arrays;
+ int file_index;
+ FILE * input_file;
+ FILE * output_file;
+
+ /* On Mac, fetch a command line. */
+#ifdef USE_CCOMMAND
+ argc = ccommand(&argv);
+#endif
+
+ 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);
+
+ /* Now safe to enable signal catcher.
+ * Note: we assume only the decompression object will have virtual arrays.
+ */
+#ifdef NEED_SIGNAL_CATCHER
+ enable_signal_catcher((j_common_ptr) &srcinfo);
+#endif
+
+ /* 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 affects 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;
+
+#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 ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
+ fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
+ exit(EXIT_FAILURE);
+ }
+ } else {
+ /* default input file is stdin */
+ input_file = read_stdin();
+ }
+
+ /* Open the output file. */
+ if (outfilename != NULL) {
+ if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
+ fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
+ exit(EXIT_FAILURE);
+ }
+ } else {
+ /* default output file is stdout */
+ output_file = write_stdout();
+ }
+
+#ifdef PROGRESS_REPORT
+ start_progress_monitor((j_common_ptr) &dstinfo, &progress);
+#endif
+
+ /* Specify data source for decompression */
+ jpeg_stdio_src(&srcinfo, input_file);
+
+ /* Enable saving of extra markers that we want to copy */
+ jcopy_markers_setup(&srcinfo, copyoption);
+
+ /* Read file header */
+ (void) jpeg_read_header(&srcinfo, TRUE);
+
+ /* 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
+ jtransform_request_workspace(&srcinfo, &transformoption);
+#endif
+
+ /* Read source file as DCT coefficients */
+ src_coef_arrays = jpeg_read_coefficients(&srcinfo);
+
+ /* 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
+
+ /* Adjust default compression parameters by re-parsing the options */
+ file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);
+
+ /* Specify data destination for compression */
+ jpeg_stdio_dest(&dstinfo, output_file);
+
+ /* 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);
+
+ /* 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);
+ jpeg_destroy_compress(&dstinfo);
+ (void) jpeg_finish_decompress(&srcinfo);
+ jpeg_destroy_decompress(&srcinfo);
+
+ /* Close files, if we opened them */
+ if (input_file != stdin)
+ fclose(input_file);
+ if (output_file != stdout)
+ fclose(output_file);
+
+#ifdef PROGRESS_REPORT
+ end_progress_monitor((j_common_ptr) &dstinfo);
+#endif
+
+ /* All done. */
+ exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);
+ return 0; /* suppress no-return-value warnings */
+}
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