617 lines
19 KiB
C
617 lines
19 KiB
C
/*
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* djpeg.c
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*
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* Copyright (C) 1991-1997, 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 the JPEG decompressor.
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* It should work on any system with Unix- or MS-DOS-style command lines.
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*
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* Two different command line styles are permitted, depending on the
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* compile-time switch TWO_FILE_COMMANDLINE:
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* djpeg [options] inputfile outputfile
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* djpeg [options] [inputfile]
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* In the second style, output is always to standard output, which you'd
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* normally redirect to a file or pipe to some other program. Input is
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* either from a named file or from standard input (typically redirected).
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* The second style is convenient on Unix but is unhelpful on systems that
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* don't support pipes. Also, you MUST use the first style if your system
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* doesn't do binary I/O to stdin/stdout.
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* To simplify script writing, the "-outfile" switch is provided. The syntax
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* djpeg [options] -outfile outputfile inputfile
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* works regardless of which command line style is used.
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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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#include <ctype.h> /* to declare isprint() */
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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 needs this */
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#include <console.h> /* ... and this */
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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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/* Create the add-on message string table. */
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#define JMESSAGE(code,string) string ,
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static const char * const cdjpeg_message_table[] = {
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#include "cderror.h"
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NULL
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};
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/*
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* This list defines the known output image formats
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* (not all of which need be supported by a given version).
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* You can change the default output format by defining DEFAULT_FMT;
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* indeed, you had better do so if you undefine PPM_SUPPORTED.
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*/
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typedef enum {
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FMT_BMP, /* BMP format (Windows flavor) */
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FMT_GIF, /* GIF format */
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FMT_OS2, /* BMP format (OS/2 flavor) */
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FMT_PPM, /* PPM/PGM (PBMPLUS formats) */
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FMT_RLE, /* RLE format */
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FMT_TARGA, /* Targa format */
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FMT_TIFF /* TIFF format */
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} IMAGE_FORMATS;
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#ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */
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#define DEFAULT_FMT FMT_PPM
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#endif
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static IMAGE_FORMATS requested_fmt;
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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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fprintf(stderr, " -colors N Reduce image to no more than N colors\n");
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fprintf(stderr, " -fast Fast, low-quality processing\n");
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fprintf(stderr, " -grayscale Force grayscale output\n");
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#ifdef IDCT_SCALING_SUPPORTED
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fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
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#endif
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#ifdef BMP_SUPPORTED
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fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n",
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(DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
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#endif
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#ifdef GIF_SUPPORTED
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fprintf(stderr, " -gif Select GIF output format%s\n",
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(DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
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#endif
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#ifdef BMP_SUPPORTED
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fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n",
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(DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
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#endif
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#ifdef PPM_SUPPORTED
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fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n",
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(DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
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#endif
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#ifdef RLE_SUPPORTED
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fprintf(stderr, " -rle Select Utah RLE output format%s\n",
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(DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
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#endif
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#ifdef TARGA_SUPPORTED
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fprintf(stderr, " -targa Select Targa output format%s\n",
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(DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
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#endif
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fprintf(stderr, "Switches for advanced users:\n");
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#ifdef DCT_ISLOW_SUPPORTED
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fprintf(stderr, " -dct int Use integer DCT method%s\n",
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(JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
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#endif
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#ifdef DCT_IFAST_SUPPORTED
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fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
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(JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
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#endif
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#ifdef DCT_FLOAT_SUPPORTED
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fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
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(JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
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#endif
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fprintf(stderr, " -dither fs Use F-S dithering (default)\n");
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fprintf(stderr, " -dither none Don't use dithering in quantization\n");
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fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n");
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#ifdef QUANT_2PASS_SUPPORTED
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fprintf(stderr, " -map FILE Map to colors used in named image file\n");
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#endif
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fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n");
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#ifdef QUANT_1PASS_SUPPORTED
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fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n");
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#endif
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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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exit(EXIT_FAILURE);
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}
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LOCAL(int)
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parse_switches (j_decompress_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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/* Set up default JPEG parameters. */
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requested_fmt = DEFAULT_FMT; /* set default output file format */
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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, "bmp", 1)) {
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/* BMP output format. */
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requested_fmt = FMT_BMP;
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} else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
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keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
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/* Do color quantization. */
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int val;
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (sscanf(argv[argn], "%d", &val) != 1)
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usage();
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cinfo->desired_number_of_colors = val;
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cinfo->quantize_colors = TRUE;
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} else if (keymatch(arg, "dct", 2)) {
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/* Select IDCT algorithm. */
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (keymatch(argv[argn], "int", 1)) {
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cinfo->dct_method = JDCT_ISLOW;
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} else if (keymatch(argv[argn], "fast", 2)) {
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cinfo->dct_method = JDCT_IFAST;
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} else if (keymatch(argv[argn], "float", 2)) {
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cinfo->dct_method = JDCT_FLOAT;
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} else
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usage();
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} else if (keymatch(arg, "dither", 2)) {
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/* Select dithering algorithm. */
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (keymatch(argv[argn], "fs", 2)) {
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cinfo->dither_mode = JDITHER_FS;
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} else if (keymatch(argv[argn], "none", 2)) {
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cinfo->dither_mode = JDITHER_NONE;
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} else if (keymatch(argv[argn], "ordered", 2)) {
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cinfo->dither_mode = JDITHER_ORDERED;
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} else
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usage();
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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 DJPEG, 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, "fast", 1)) {
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/* Select recommended processing options for quick-and-dirty output. */
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cinfo->two_pass_quantize = FALSE;
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cinfo->dither_mode = JDITHER_ORDERED;
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if (! cinfo->quantize_colors) /* don't override an earlier -colors */
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cinfo->desired_number_of_colors = 216;
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cinfo->dct_method = JDCT_FASTEST;
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cinfo->do_fancy_upsampling = FALSE;
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} else if (keymatch(arg, "gif", 1)) {
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/* GIF output format. */
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requested_fmt = FMT_GIF;
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} else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
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/* Force monochrome output. */
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cinfo->out_color_space = JCS_GRAYSCALE;
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} else if (keymatch(arg, "map", 3)) {
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/* Quantize to a color map taken from an input file. */
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (for_real) { /* too expensive to do twice! */
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#ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */
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FILE * mapfile;
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if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
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fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
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exit(EXIT_FAILURE);
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}
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read_color_map(cinfo, mapfile);
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fclose(mapfile);
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cinfo->quantize_colors = TRUE;
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#else
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ERREXIT(cinfo, JERR_NOT_COMPILED);
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#endif
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}
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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, "nosmooth", 3)) {
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/* Suppress fancy upsampling */
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cinfo->do_fancy_upsampling = FALSE;
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} else if (keymatch(arg, "onepass", 3)) {
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/* Use fast one-pass quantization. */
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cinfo->two_pass_quantize = FALSE;
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} else if (keymatch(arg, "os2", 3)) {
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/* BMP output format (OS/2 flavor). */
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requested_fmt = FMT_OS2;
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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, "pnm", 1) || keymatch(arg, "ppm", 1)) {
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/* PPM/PGM output format. */
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requested_fmt = FMT_PPM;
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} else if (keymatch(arg, "rle", 1)) {
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/* RLE output format. */
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requested_fmt = FMT_RLE;
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} else if (keymatch(arg, "scale", 1)) {
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/* Scale the output image by a fraction M/N. */
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if (++argn >= argc) /* advance to next argument */
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usage();
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if (sscanf(argv[argn], "%d/%d",
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&cinfo->scale_num, &cinfo->scale_denom) != 2)
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usage();
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} else if (keymatch(arg, "targa", 1)) {
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/* Targa output format. */
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requested_fmt = FMT_TARGA;
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} else {
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usage(); /* bogus switch */
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}
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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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* Marker processor for COM and interesting APPn markers.
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* This replaces the library's built-in processor, which just skips the marker.
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* We want to print out the marker as text, to the extent possible.
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* Note this code relies on a non-suspending data source.
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*/
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LOCAL(unsigned int)
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jpeg_getc (j_decompress_ptr cinfo)
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/* Read next byte */
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{
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struct jpeg_source_mgr * datasrc = cinfo->src;
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if (datasrc->bytes_in_buffer == 0) {
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if (! (*datasrc->fill_input_buffer) (cinfo))
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ERREXIT(cinfo, JERR_CANT_SUSPEND);
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}
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datasrc->bytes_in_buffer--;
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return GETJOCTET(*datasrc->next_input_byte++);
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}
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METHODDEF(boolean)
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print_text_marker (j_decompress_ptr cinfo)
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{
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boolean traceit = (cinfo->err->trace_level >= 1);
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INT32 length;
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unsigned int ch;
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unsigned int lastch = 0;
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length = jpeg_getc(cinfo) << 8;
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length += jpeg_getc(cinfo);
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length -= 2; /* discount the length word itself */
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if (traceit) {
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if (cinfo->unread_marker == JPEG_COM)
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fprintf(stderr, "Comment, length %ld:\n", (long) length);
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else /* assume it is an APPn otherwise */
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fprintf(stderr, "APP%d, length %ld:\n",
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cinfo->unread_marker - JPEG_APP0, (long) length);
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}
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while (--length >= 0) {
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ch = jpeg_getc(cinfo);
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if (traceit) {
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/* Emit the character in a readable form.
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* Nonprintables are converted to \nnn form,
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* while \ is converted to \\.
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* Newlines in CR, CR/LF, or LF form will be printed as one newline.
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*/
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if (ch == '\r') {
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fprintf(stderr, "\n");
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} else if (ch == '\n') {
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if (lastch != '\r')
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fprintf(stderr, "\n");
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} else if (ch == '\\') {
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fprintf(stderr, "\\\\");
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} else if (isprint(ch)) {
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putc(ch, stderr);
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} else {
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fprintf(stderr, "\\%03o", ch);
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}
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lastch = ch;
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}
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}
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if (traceit)
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fprintf(stderr, "\n");
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return TRUE;
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}
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/*
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* The main program.
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*/
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int
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main (int argc, char **argv)
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{
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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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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int file_index;
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djpeg_dest_ptr dest_mgr = NULL;
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FILE * input_file;
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FILE * output_file;
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JDIMENSION num_scanlines;
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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 = "djpeg"; /* 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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cinfo.err = jpeg_std_error(&jerr);
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jpeg_create_decompress(&cinfo);
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/* Add some application-specific error messages (from cderror.h) */
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jerr.addon_message_table = cdjpeg_message_table;
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jerr.first_addon_message = JMSG_FIRSTADDONCODE;
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jerr.last_addon_message = JMSG_LASTADDONCODE;
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/* Insert custom marker processor for COM and APP12.
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* APP12 is used by some digital camera makers for textual info,
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* so we provide the ability to display it as text.
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* If you like, additional APPn marker types can be selected for display,
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* but don't try to override APP0 or APP14 this way (see libjpeg.doc).
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*/
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jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
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jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);
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/* Now safe to enable signal catcher. */
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#ifdef NEED_SIGNAL_CATCHER
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enable_signal_catcher((j_common_ptr) &cinfo);
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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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* (Exception: tracing level set here controls verbosity for COM markers
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* found during jpeg_read_header...)
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*/
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file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
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#ifdef TWO_FILE_COMMANDLINE
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|
/* 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) &cinfo, &progress);
|
|
#endif
|
|
|
|
/* Specify data source for decompression */
|
|
jpeg_stdio_src(&cinfo, input_file);
|
|
|
|
/* Read file header, set default decompression parameters */
|
|
(void) jpeg_read_header(&cinfo, TRUE);
|
|
|
|
/* Adjust default decompression parameters by re-parsing the options */
|
|
file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
|
|
|
|
/* Initialize the output module now to let it override any crucial
|
|
* option settings (for instance, GIF wants to force color quantization).
|
|
*/
|
|
switch (requested_fmt) {
|
|
#ifdef BMP_SUPPORTED
|
|
case FMT_BMP:
|
|
dest_mgr = jinit_write_bmp(&cinfo, FALSE);
|
|
break;
|
|
case FMT_OS2:
|
|
dest_mgr = jinit_write_bmp(&cinfo, TRUE);
|
|
break;
|
|
#endif
|
|
#ifdef GIF_SUPPORTED
|
|
case FMT_GIF:
|
|
dest_mgr = jinit_write_gif(&cinfo);
|
|
break;
|
|
#endif
|
|
#ifdef PPM_SUPPORTED
|
|
case FMT_PPM:
|
|
dest_mgr = jinit_write_ppm(&cinfo);
|
|
break;
|
|
#endif
|
|
#ifdef RLE_SUPPORTED
|
|
case FMT_RLE:
|
|
dest_mgr = jinit_write_rle(&cinfo);
|
|
break;
|
|
#endif
|
|
#ifdef TARGA_SUPPORTED
|
|
case FMT_TARGA:
|
|
dest_mgr = jinit_write_targa(&cinfo);
|
|
break;
|
|
#endif
|
|
default:
|
|
ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
|
|
break;
|
|
}
|
|
dest_mgr->output_file = output_file;
|
|
|
|
/* Start decompressor */
|
|
(void) jpeg_start_decompress(&cinfo);
|
|
|
|
/* Write output file header */
|
|
(*dest_mgr->start_output) (&cinfo, dest_mgr);
|
|
|
|
/* Process data */
|
|
while (cinfo.output_scanline < cinfo.output_height) {
|
|
num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
|
|
dest_mgr->buffer_height);
|
|
(*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
|
|
}
|
|
|
|
#ifdef PROGRESS_REPORT
|
|
/* Hack: count final pass as done in case finish_output does an extra pass.
|
|
* The library won't have updated completed_passes.
|
|
*/
|
|
progress.pub.completed_passes = progress.pub.total_passes;
|
|
#endif
|
|
|
|
/* Finish decompression and release memory.
|
|
* I must do it in this order because output module has allocated memory
|
|
* of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
|
|
*/
|
|
(*dest_mgr->finish_output) (&cinfo, dest_mgr);
|
|
(void) jpeg_finish_decompress(&cinfo);
|
|
jpeg_destroy_decompress(&cinfo);
|
|
|
|
/* 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) &cinfo);
|
|
#endif
|
|
|
|
/* All done. */
|
|
exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
|
|
return 0; /* suppress no-return-value warnings */
|
|
}
|