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370 lines
11 KiB
C
370 lines
11 KiB
C
/*
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* jpegtran.c
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*
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* Copyright (C) 1995, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains a command-line user interface for JPEG transcoding.
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* It is very similar to cjpeg.c, but provides lossless transcoding between
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* different JPEG file formats.
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*/
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#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
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#include "jversion.h" /* for version message */
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#ifdef USE_CCOMMAND /* command-line reader for Macintosh */
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#ifdef __MWERKS__
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#include <SIOUX.h> /* Metrowerks declares it here */
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#endif
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#ifdef THINK_C
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#include <console.h> /* Think declares it here */
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#endif
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#endif
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/*
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* Argument-parsing code.
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* The switch parser is designed to be useful with DOS-style command line
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* syntax, ie, intermixed switches and file names, where only the switches
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* to the left of a given file name affect processing of that file.
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* The main program in this file doesn't actually use this capability...
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*/
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static const char * progname; /* program name for error messages */
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static char * outfilename; /* for -outfile switch */
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LOCAL void
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usage (void)
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/* complain about bad command line */
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{
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fprintf(stderr, "usage: %s [switches] ", progname);
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#ifdef TWO_FILE_COMMANDLINE
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fprintf(stderr, "inputfile outputfile\n");
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#else
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fprintf(stderr, "[inputfile]\n");
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#endif
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fprintf(stderr, "Switches (names may be abbreviated):\n");
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#ifdef ENTROPY_OPT_SUPPORTED
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fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");
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#endif
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#ifdef C_PROGRESSIVE_SUPPORTED
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fprintf(stderr, " -progressive Create progressive JPEG file\n");
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#endif
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fprintf(stderr, "Switches for advanced users:\n");
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fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");
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fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
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fprintf(stderr, " -outfile name Specify name for output file\n");
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fprintf(stderr, " -verbose or -debug Emit debug output\n");
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fprintf(stderr, "Switches for wizards:\n");
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#ifdef C_ARITH_CODING_SUPPORTED
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fprintf(stderr, " -arithmetic Use arithmetic coding\n");
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#endif
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#ifdef C_MULTISCAN_FILES_SUPPORTED
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fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
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#endif
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exit(EXIT_FAILURE);
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}
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LOCAL int
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parse_switches (j_compress_ptr cinfo, int argc, char **argv,
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int last_file_arg_seen, boolean for_real)
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/* Parse optional switches.
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* Returns argv[] index of first file-name argument (== argc if none).
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* Any file names with indexes <= last_file_arg_seen are ignored;
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* they have presumably been processed in a previous iteration.
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* (Pass 0 for last_file_arg_seen on the first or only iteration.)
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* for_real is FALSE on the first (dummy) pass; we may skip any expensive
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* processing.
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*/
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{
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int argn;
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char * arg;
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boolean simple_progressive;
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char * scansarg = NULL; /* saves -scans parm if any */
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/* Set up default JPEG parameters. */
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simple_progressive = FALSE;
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outfilename = NULL;
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cinfo->err->trace_level = 0;
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/* Scan command line options, adjust parameters */
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for (argn = 1; argn < argc; argn++) {
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arg = argv[argn];
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if (*arg != '-') {
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/* Not a switch, must be a file name argument */
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if (argn <= last_file_arg_seen) {
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outfilename = NULL; /* -outfile applies to just one input file */
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continue; /* ignore this name if previously processed */
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}
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break; /* else done parsing switches */
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}
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arg++; /* advance past switch marker character */
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if (keymatch(arg, "arithmetic", 1)) {
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/* Use arithmetic coding. */
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#ifdef C_ARITH_CODING_SUPPORTED
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cinfo->arith_code = TRUE;
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#else
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fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
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progname);
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exit(EXIT_FAILURE);
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#endif
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} else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
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/* Enable debug printouts. */
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/* On first -d, print version identification */
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static boolean printed_version = FALSE;
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if (! printed_version) {
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fprintf(stderr, "Independent JPEG Group's JPEGTRAN, version %s\n%s\n",
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JVERSION, JCOPYRIGHT);
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printed_version = TRUE;
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}
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cinfo->err->trace_level++;
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} else if (keymatch(arg, "maxmemory", 3)) {
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/* Maximum memory in Kb (or Mb with 'm'). */
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long lval;
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char ch = 'x';
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
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usage();
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if (ch == 'm' || ch == 'M')
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lval *= 1000L;
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cinfo->mem->max_memory_to_use = lval * 1000L;
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} else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
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/* Enable entropy parm optimization. */
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#ifdef ENTROPY_OPT_SUPPORTED
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cinfo->optimize_coding = TRUE;
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#else
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fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
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progname);
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exit(EXIT_FAILURE);
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#endif
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} else if (keymatch(arg, "outfile", 4)) {
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/* Set output file name. */
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if (++argn >= argc) /* advance to next argument */
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usage();
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outfilename = argv[argn]; /* save it away for later use */
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} else if (keymatch(arg, "progressive", 1)) {
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/* Select simple progressive mode. */
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#ifdef C_PROGRESSIVE_SUPPORTED
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simple_progressive = TRUE;
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/* We must postpone execution until num_components is known. */
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#else
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fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
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progname);
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exit(EXIT_FAILURE);
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#endif
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} else if (keymatch(arg, "restart", 1)) {
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/* Restart interval in MCU rows (or in MCUs with 'b'). */
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long lval;
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char ch = 'x';
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
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usage();
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if (lval < 0 || lval > 65535L)
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usage();
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if (ch == 'b' || ch == 'B') {
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cinfo->restart_interval = (unsigned int) lval;
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cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
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} else {
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cinfo->restart_in_rows = (int) lval;
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/* restart_interval will be computed during startup */
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}
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} else if (keymatch(arg, "scans", 2)) {
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/* Set scan script. */
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#ifdef C_MULTISCAN_FILES_SUPPORTED
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if (++argn >= argc) /* advance to next argument */
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usage();
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scansarg = argv[argn];
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/* We must postpone reading the file in case -progressive appears. */
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#else
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fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
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progname);
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exit(EXIT_FAILURE);
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#endif
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} else {
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usage(); /* bogus switch */
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}
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}
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/* Post-switch-scanning cleanup */
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if (for_real) {
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#ifdef C_PROGRESSIVE_SUPPORTED
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if (simple_progressive) /* process -progressive; -scans can override */
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jpeg_simple_progression(cinfo);
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#endif
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#ifdef C_MULTISCAN_FILES_SUPPORTED
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if (scansarg != NULL) /* process -scans if it was present */
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if (! read_scan_script(cinfo, scansarg))
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usage();
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#endif
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}
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return argn; /* return index of next arg (file name) */
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}
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/*
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* The main program.
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*/
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GLOBAL int
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main (int argc, char **argv)
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{
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struct jpeg_decompress_struct srcinfo;
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struct jpeg_compress_struct dstinfo;
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struct jpeg_error_mgr jsrcerr, jdsterr;
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#ifdef PROGRESS_REPORT
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struct cdjpeg_progress_mgr progress;
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#endif
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jvirt_barray_ptr * coef_arrays;
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int file_index;
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FILE * input_file;
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FILE * output_file;
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/* On Mac, fetch a command line. */
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#ifdef USE_CCOMMAND
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argc = ccommand(&argv);
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#endif
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progname = argv[0];
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if (progname == NULL || progname[0] == 0)
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progname = "jpegtran"; /* in case C library doesn't provide it */
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/* Initialize the JPEG decompression object with default error handling. */
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srcinfo.err = jpeg_std_error(&jsrcerr);
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jpeg_create_decompress(&srcinfo);
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/* Initialize the JPEG compression object with default error handling. */
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dstinfo.err = jpeg_std_error(&jdsterr);
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jpeg_create_compress(&dstinfo);
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/* Now safe to enable signal catcher.
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* Note: we assume only the decompression object will have virtual arrays.
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*/
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#ifdef NEED_SIGNAL_CATCHER
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enable_signal_catcher((j_common_ptr) &srcinfo);
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#endif
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/* Scan command line to find file names.
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* It is convenient to use just one switch-parsing routine, but the switch
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* values read here are ignored; we will rescan the switches after opening
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* the input file.
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*/
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file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);
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jsrcerr.trace_level = jdsterr.trace_level;
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#ifdef TWO_FILE_COMMANDLINE
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/* Must have either -outfile switch or explicit output file name */
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if (outfilename == NULL) {
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if (file_index != argc-2) {
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fprintf(stderr, "%s: must name one input and one output file\n",
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progname);
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usage();
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}
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outfilename = argv[file_index+1];
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} else {
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if (file_index != argc-1) {
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fprintf(stderr, "%s: must name one input and one output file\n",
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progname);
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usage();
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}
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}
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#else
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/* Unix style: expect zero or one file name */
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if (file_index < argc-1) {
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fprintf(stderr, "%s: only one input file\n", progname);
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usage();
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}
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#endif /* TWO_FILE_COMMANDLINE */
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/* Open the input file. */
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if (file_index < argc) {
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if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
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fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
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exit(EXIT_FAILURE);
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}
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} else {
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/* default input file is stdin */
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input_file = read_stdin();
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}
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/* Open the output file. */
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if (outfilename != NULL) {
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if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
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fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
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exit(EXIT_FAILURE);
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}
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} else {
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/* default output file is stdout */
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output_file = write_stdout();
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}
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#ifdef PROGRESS_REPORT
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start_progress_monitor((j_common_ptr) &dstinfo, &progress);
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#endif
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/* Specify data source for decompression */
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jpeg_stdio_src(&srcinfo, input_file);
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/* Read file header */
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(void) jpeg_read_header(&srcinfo, TRUE);
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/* Read source file as DCT coefficients */
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coef_arrays = jpeg_read_coefficients(&srcinfo);
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/* Initialize destination compression parameters from source values */
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jpeg_copy_critical_parameters(&srcinfo, &dstinfo);
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/* Adjust default compression parameters by re-parsing the options */
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file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);
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/* Specify data destination for compression */
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jpeg_stdio_dest(&dstinfo, output_file);
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/* Start compressor */
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jpeg_write_coefficients(&dstinfo, coef_arrays);
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/* ought to copy source comments here... */
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/* Finish compression and release memory */
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jpeg_finish_compress(&dstinfo);
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jpeg_destroy_compress(&dstinfo);
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(void) jpeg_finish_decompress(&srcinfo);
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jpeg_destroy_decompress(&srcinfo);
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/* Close files, if we opened them */
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if (input_file != stdin)
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fclose(input_file);
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if (output_file != stdout)
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fclose(output_file);
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#ifdef PROGRESS_REPORT
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end_progress_monitor((j_common_ptr) &dstinfo);
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#endif
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/* All done. */
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exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);
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return 0; /* suppress no-return-value warnings */
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}
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