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-rw-r--r--jpeg/djpeg.c617
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diff --git a/jpeg/djpeg.c b/jpeg/djpeg.c
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-/*
- * djpeg.c
- *
- * Copyright (C) 1991-1997, Thomas G. Lane.
- * Modified 2009 by Guido Vollbeding.
- * 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 the JPEG decompressor.
- * It should work on any system with Unix- or MS-DOS-style command lines.
- *
- * Two different command line styles are permitted, depending on the
- * compile-time switch TWO_FILE_COMMANDLINE:
- * djpeg [options] inputfile outputfile
- * djpeg [options] [inputfile]
- * In the second style, output is always to standard output, which you'd
- * normally redirect to a file or pipe to some other program. Input is
- * either from a named file or from standard input (typically redirected).
- * The second style is convenient on Unix but is unhelpful on systems that
- * don't support pipes. Also, you MUST use the first style if your system
- * doesn't do binary I/O to stdin/stdout.
- * To simplify script writing, the "-outfile" switch is provided. The syntax
- * djpeg [options] -outfile outputfile inputfile
- * works regardless of which command line style is used.
- */
-
-#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
-#include "jversion.h" /* for version message */
-
-#include <ctype.h> /* to declare isprint() */
-
-#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
-
-
-/* Create the add-on message string table. */
-
-#define JMESSAGE(code,string) string ,
-
-static const char * const cdjpeg_message_table[] = {
-#include "cderror.h"
- NULL
-};
-
-
-/*
- * This list defines the known output image formats
- * (not all of which need be supported by a given version).
- * You can change the default output format by defining DEFAULT_FMT;
- * indeed, you had better do so if you undefine PPM_SUPPORTED.
- */
-
-typedef enum {
- FMT_BMP, /* BMP format (Windows flavor) */
- FMT_GIF, /* GIF format */
- FMT_OS2, /* BMP format (OS/2 flavor) */
- FMT_PPM, /* PPM/PGM (PBMPLUS formats) */
- FMT_RLE, /* RLE format */
- FMT_TARGA, /* Targa format */
- FMT_TIFF /* TIFF format */
-} IMAGE_FORMATS;
-
-#ifndef DEFAULT_FMT /* so can override from CFLAGS in Makefile */
-#define DEFAULT_FMT FMT_PPM
-#endif
-
-static IMAGE_FORMATS requested_fmt;
-
-
-/*
- * 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 */
-
-
-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, " -colors N Reduce image to no more than N colors\n");
- fprintf(stderr, " -fast Fast, low-quality processing\n");
- fprintf(stderr, " -grayscale Force grayscale output\n");
-#ifdef IDCT_SCALING_SUPPORTED
- fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
-#endif
-#ifdef BMP_SUPPORTED
- fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n",
- (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
-#endif
-#ifdef GIF_SUPPORTED
- fprintf(stderr, " -gif Select GIF output format%s\n",
- (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
-#endif
-#ifdef BMP_SUPPORTED
- fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n",
- (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
-#endif
-#ifdef PPM_SUPPORTED
- fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n",
- (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
-#endif
-#ifdef RLE_SUPPORTED
- fprintf(stderr, " -rle Select Utah RLE output format%s\n",
- (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
-#endif
-#ifdef TARGA_SUPPORTED
- fprintf(stderr, " -targa Select Targa output format%s\n",
- (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
-#endif
- fprintf(stderr, "Switches for advanced users:\n");
-#ifdef DCT_ISLOW_SUPPORTED
- fprintf(stderr, " -dct int Use integer DCT method%s\n",
- (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
-#endif
-#ifdef DCT_IFAST_SUPPORTED
- fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
- (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
-#endif
-#ifdef DCT_FLOAT_SUPPORTED
- fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
- (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
-#endif
- fprintf(stderr, " -dither fs Use F-S dithering (default)\n");
- fprintf(stderr, " -dither none Don't use dithering in quantization\n");
- fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n");
-#ifdef QUANT_2PASS_SUPPORTED
- fprintf(stderr, " -map FILE Map to colors used in named image file\n");
-#endif
- fprintf(stderr, " -nosmooth Don't use high-quality upsampling\n");
-#ifdef QUANT_1PASS_SUPPORTED
- fprintf(stderr, " -onepass Use 1-pass quantization (fast, low quality)\n");
-#endif
- 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");
- exit(EXIT_FAILURE);
-}
-
-
-LOCAL(int)
-parse_switches (j_decompress_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;
-
- /* Set up default JPEG parameters. */
- requested_fmt = DEFAULT_FMT; /* set default output file format */
- outfilename = NULL;
- 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, "bmp", 1)) {
- /* BMP output format. */
- requested_fmt = FMT_BMP;
-
- } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
- keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
- /* Do color quantization. */
- int val;
-
- if (++argn >= argc) /* advance to next argument */
- usage();
- if (sscanf(argv[argn], "%d", &val) != 1)
- usage();
- cinfo->desired_number_of_colors = val;
- cinfo->quantize_colors = TRUE;
-
- } else if (keymatch(arg, "dct", 2)) {
- /* Select IDCT algorithm. */
- if (++argn >= argc) /* advance to next argument */
- usage();
- if (keymatch(argv[argn], "int", 1)) {
- cinfo->dct_method = JDCT_ISLOW;
- } else if (keymatch(argv[argn], "fast", 2)) {
- cinfo->dct_method = JDCT_IFAST;
- } else if (keymatch(argv[argn], "float", 2)) {
- cinfo->dct_method = JDCT_FLOAT;
- } else
- usage();
-
- } else if (keymatch(arg, "dither", 2)) {
- /* Select dithering algorithm. */
- if (++argn >= argc) /* advance to next argument */
- usage();
- if (keymatch(argv[argn], "fs", 2)) {
- cinfo->dither_mode = JDITHER_FS;
- } else if (keymatch(argv[argn], "none", 2)) {
- cinfo->dither_mode = JDITHER_NONE;
- } else if (keymatch(argv[argn], "ordered", 2)) {
- cinfo->dither_mode = JDITHER_ORDERED;
- } 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 DJPEG, version %s\n%s\n",
- JVERSION, JCOPYRIGHT);
- printed_version = TRUE;
- }
- cinfo->err->trace_level++;
-
- } else if (keymatch(arg, "fast", 1)) {
- /* Select recommended processing options for quick-and-dirty output. */
- cinfo->two_pass_quantize = FALSE;
- cinfo->dither_mode = JDITHER_ORDERED;
- if (! cinfo->quantize_colors) /* don't override an earlier -colors */
- cinfo->desired_number_of_colors = 216;
- cinfo->dct_method = JDCT_FASTEST;
- cinfo->do_fancy_upsampling = FALSE;
-
- } else if (keymatch(arg, "gif", 1)) {
- /* GIF output format. */
- requested_fmt = FMT_GIF;
-
- } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
- /* Force monochrome output. */
- cinfo->out_color_space = JCS_GRAYSCALE;
-
- } else if (keymatch(arg, "map", 3)) {
- /* Quantize to a color map taken from an input file. */
- if (++argn >= argc) /* advance to next argument */
- usage();
- if (for_real) { /* too expensive to do twice! */
-#ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */
- FILE * mapfile;
-
- if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
- fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
- exit(EXIT_FAILURE);
- }
- read_color_map(cinfo, mapfile);
- fclose(mapfile);
- cinfo->quantize_colors = TRUE;
-#else
- ERREXIT(cinfo, JERR_NOT_COMPILED);
-#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, "nosmooth", 3)) {
- /* Suppress fancy upsampling */
- cinfo->do_fancy_upsampling = FALSE;
-
- } else if (keymatch(arg, "onepass", 3)) {
- /* Use fast one-pass quantization. */
- cinfo->two_pass_quantize = FALSE;
-
- } else if (keymatch(arg, "os2", 3)) {
- /* BMP output format (OS/2 flavor). */
- requested_fmt = FMT_OS2;
-
- } 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, "pnm", 1) || keymatch(arg, "ppm", 1)) {
- /* PPM/PGM output format. */
- requested_fmt = FMT_PPM;
-
- } else if (keymatch(arg, "rle", 1)) {
- /* RLE output format. */
- requested_fmt = FMT_RLE;
-
- } else if (keymatch(arg, "scale", 1)) {
- /* Scale the output image by a fraction M/N. */
- if (++argn >= argc) /* advance to next argument */
- usage();
- if (sscanf(argv[argn], "%d/%d",
- &cinfo->scale_num, &cinfo->scale_denom) < 1)
- usage();
-
- } else if (keymatch(arg, "targa", 1)) {
- /* Targa output format. */
- requested_fmt = FMT_TARGA;
-
- } else {
- usage(); /* bogus switch */
- }
- }
-
- return argn; /* return index of next arg (file name) */
-}
-
-
-/*
- * Marker processor for COM and interesting APPn markers.
- * This replaces the library's built-in processor, which just skips the marker.
- * We want to print out the marker as text, to the extent possible.
- * Note this code relies on a non-suspending data source.
- */
-
-LOCAL(unsigned int)
-jpeg_getc (j_decompress_ptr cinfo)
-/* Read next byte */
-{
- struct jpeg_source_mgr * datasrc = cinfo->src;
-
- if (datasrc->bytes_in_buffer == 0) {
- if (! (*datasrc->fill_input_buffer) (cinfo))
- ERREXIT(cinfo, JERR_CANT_SUSPEND);
- }
- datasrc->bytes_in_buffer--;
- return GETJOCTET(*datasrc->next_input_byte++);
-}
-
-
-METHODDEF(boolean)
-print_text_marker (j_decompress_ptr cinfo)
-{
- boolean traceit = (cinfo->err->trace_level >= 1);
- INT32 length;
- unsigned int ch;
- unsigned int lastch = 0;
-
- length = jpeg_getc(cinfo) << 8;
- length += jpeg_getc(cinfo);
- length -= 2; /* discount the length word itself */
-
- if (traceit) {
- if (cinfo->unread_marker == JPEG_COM)
- fprintf(stderr, "Comment, length %ld:\n", (long) length);
- else /* assume it is an APPn otherwise */
- fprintf(stderr, "APP%d, length %ld:\n",
- cinfo->unread_marker - JPEG_APP0, (long) length);
- }
-
- while (--length >= 0) {
- ch = jpeg_getc(cinfo);
- if (traceit) {
- /* Emit the character in a readable form.
- * Nonprintables are converted to \nnn form,
- * while \ is converted to \\.
- * Newlines in CR, CR/LF, or LF form will be printed as one newline.
- */
- if (ch == '\r') {
- fprintf(stderr, "\n");
- } else if (ch == '\n') {
- if (lastch != '\r')
- fprintf(stderr, "\n");
- } else if (ch == '\\') {
- fprintf(stderr, "\\\\");
- } else if (isprint(ch)) {
- putc(ch, stderr);
- } else {
- fprintf(stderr, "\\%03o", ch);
- }
- lastch = ch;
- }
- }
-
- if (traceit)
- fprintf(stderr, "\n");
-
- return TRUE;
-}
-
-
-/*
- * The main program.
- */
-
-int
-main (int argc, char **argv)
-{
- struct jpeg_decompress_struct cinfo;
- struct jpeg_error_mgr jerr;
-#ifdef PROGRESS_REPORT
- struct cdjpeg_progress_mgr progress;
-#endif
- int file_index;
- djpeg_dest_ptr dest_mgr = NULL;
- FILE * input_file;
- FILE * output_file;
- JDIMENSION num_scanlines;
-
- /* On Mac, fetch a command line. */
-#ifdef USE_CCOMMAND
- argc = ccommand(&argv);
-#endif
-
- progname = argv[0];
- if (progname == NULL || progname[0] == 0)
- progname = "djpeg"; /* in case C library doesn't provide it */
-
- /* Initialize the JPEG decompression object with default error handling. */
- cinfo.err = jpeg_std_error(&jerr);
- jpeg_create_decompress(&cinfo);
- /* Add some application-specific error messages (from cderror.h) */
- jerr.addon_message_table = cdjpeg_message_table;
- jerr.first_addon_message = JMSG_FIRSTADDONCODE;
- jerr.last_addon_message = JMSG_LASTADDONCODE;
-
- /* Insert custom marker processor for COM and APP12.
- * APP12 is used by some digital camera makers for textual info,
- * so we provide the ability to display it as text.
- * If you like, additional APPn marker types can be selected for display,
- * but don't try to override APP0 or APP14 this way (see libjpeg.doc).
- */
- jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
- jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);
-
- /* Now safe to enable signal catcher. */
-#ifdef NEED_SIGNAL_CATCHER
- enable_signal_catcher((j_common_ptr) &cinfo);
-#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 ignored; we will rescan the switches after opening
- * the input file.
- * (Exception: tracing level set here controls verbosity for COM markers
- * found during jpeg_read_header...)
- */
-
- file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
-
-#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) &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 */
-}
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