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- /*
- * jdmain.c
- *
- * Copyright (C) 1991, 1992, 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 trivial test 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.
- */
-
- #include "jinclude.h"
- #ifdef INCLUDES_ARE_ANSI
- #include <stdlib.h> /* to declare exit() */
- #endif
- #ifdef NEED_SIGNAL_CATCHER
- #include <signal.h> /* to declare signal() */
- #endif
-
- #ifdef THINK_C
- #include <console.h> /* command-line reader for Macintosh */
- #endif
-
- #ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */
- #define READ_BINARY "r"
- #define WRITE_BINARY "w"
- #else
- #define READ_BINARY "rb"
- #define WRITE_BINARY "wb"
- #endif
-
- #ifndef EXIT_FAILURE /* define exit() codes if not provided */
- #define EXIT_FAILURE 1
- #endif
- #ifndef EXIT_SUCCESS
- #ifdef VMS
- #define EXIT_SUCCESS 1 /* VMS is very nonstandard */
- #else
- #define EXIT_SUCCESS 0
- #endif
- #endif
-
-
- #include "jversion.h" /* for version message */
-
-
- /*
- * PD version of getopt(3).
- */
-
- #include "egetopt.c"
-
-
- /*
- * 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_GIF, /* GIF format */
- 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;
-
-
- /*
- * This routine gets control after the input file header has been read.
- * It must determine what output file format is to be written,
- * and make any other decompression parameter changes that are desirable.
- */
-
- METHODDEF void
- d_ui_method_selection (decompress_info_ptr cinfo)
- {
- /* if grayscale or CMYK input, force similar output; */
- /* else leave the output colorspace as set by options. */
- if (cinfo->jpeg_color_space == CS_GRAYSCALE)
- cinfo->out_color_space = CS_GRAYSCALE;
- else if (cinfo->jpeg_color_space == CS_CMYK)
- cinfo->out_color_space = CS_CMYK;
-
- /* select output file format */
- /* Note: jselwxxx routine may make additional parameter changes,
- * such as forcing color quantization if it's a colormapped format.
- */
- switch (requested_fmt) {
- #ifdef GIF_SUPPORTED
- case FMT_GIF:
- jselwgif(cinfo);
- break;
- #endif
- #ifdef PPM_SUPPORTED
- case FMT_PPM:
- jselwppm(cinfo);
- break;
- #endif
- #ifdef RLE_SUPPORTED
- case FMT_RLE:
- jselwrle(cinfo);
- break;
- #endif
- #ifdef TARGA_SUPPORTED
- case FMT_TARGA:
- jselwtarga(cinfo);
- break;
- #endif
- default:
- ERREXIT(cinfo->emethods, "Unsupported output file format");
- break;
- }
- }
-
-
- /*
- * Signal catcher to ensure that temporary files are removed before aborting.
- * NB: for Amiga Manx C this is actually a global routine named _abort();
- * see -Dsignal_catcher=_abort in CFLAGS. Talk about bogus...
- */
-
- #ifdef NEED_SIGNAL_CATCHER
-
- static external_methods_ptr emethods; /* for access to free_all */
-
- GLOBAL void
- signal_catcher (int signum)
- {
- emethods->trace_level = 0; /* turn off trace output */
- (*emethods->free_all) (); /* clean up memory allocation & temp files */
- exit(EXIT_FAILURE);
- }
-
- #endif
-
-
- LOCAL void
- usage (char * progname)
- /* complain about bad command line */
- {
- fprintf(stderr, "usage: %s ", progname);
- fprintf(stderr, "[-G] [-P] [-R] [-T] [-b] [-g] [-q colors] [-1] [-D] [-d] [-m mem]");
- #ifdef TWO_FILE_COMMANDLINE
- fprintf(stderr, " inputfile outputfile\n");
- #else
- fprintf(stderr, " [inputfile]\n");
- #endif
- exit(EXIT_FAILURE);
- }
-
-
- /*
- * The main program.
- */
-
- GLOBAL int
- main (int argc, char **argv)
- {
- struct decompress_info_struct cinfo;
- struct decompress_methods_struct dc_methods;
- struct external_methods_struct e_methods;
- int c;
-
- /* On Mac, fetch a command line. */
- #ifdef THINK_C
- argc = ccommand(&argv);
- #endif
-
- /* Initialize the system-dependent method pointers. */
- cinfo.methods = &dc_methods;
- cinfo.emethods = &e_methods;
- jselerror(&e_methods); /* error/trace message routines */
- jselmemmgr(&e_methods); /* memory allocation routines */
- dc_methods.d_ui_method_selection = d_ui_method_selection;
-
- /* Now OK to enable signal catcher. */
- #ifdef NEED_SIGNAL_CATCHER
- emethods = &e_methods;
- signal(SIGINT, signal_catcher);
- #ifdef SIGTERM /* not all systems have SIGTERM */
- signal(SIGTERM, signal_catcher);
- #endif
- #endif
-
- /* Set up default JPEG parameters. */
- j_d_defaults(&cinfo, TRUE);
- requested_fmt = DEFAULT_FMT; /* set default output file format */
-
- /* Scan command line options, adjust parameters */
-
- while ((c = egetopt(argc, argv, "GPRTbgq:1Dm:d")) != EOF)
- switch (c) {
- case 'G': /* GIF output format. */
- requested_fmt = FMT_GIF;
- break;
- case 'P': /* PPM output format. */
- requested_fmt = FMT_PPM;
- break;
- case 'R': /* RLE output format. */
- requested_fmt = FMT_RLE;
- break;
- case 'T': /* Targa output format. */
- requested_fmt = FMT_TARGA;
- break;
- case 'b': /* Enable cross-block smoothing. */
- cinfo.do_block_smoothing = TRUE;
- break;
- case 'g': /* Force grayscale output. */
- cinfo.out_color_space = CS_GRAYSCALE;
- break;
- case 'q': /* Do color quantization. */
- { int val;
- if (optarg == NULL)
- usage(argv[0]);
- if (sscanf(optarg, "%d", &val) != 1)
- usage(argv[0]);
- cinfo.desired_number_of_colors = val;
- }
- cinfo.quantize_colors = TRUE;
- break;
- case '1': /* Use fast one-pass quantization. */
- cinfo.two_pass_quantize = FALSE;
- break;
- case 'D': /* Suppress dithering in color quantization. */
- cinfo.use_dithering = FALSE;
- break;
- case 'm': /* Maximum memory in Kb (or Mb with 'm'). */
- { long lval;
- char ch = 'x';
-
- if (optarg == NULL)
- usage(argv[0]);
- if (sscanf(optarg, "%ld%c", &lval, &ch) < 1)
- usage(argv[0]);
- if (ch == 'm' || ch == 'M')
- lval *= 1000L;
- e_methods.max_memory_to_use = lval * 1000L;
- }
- break;
- case 'd': /* Debugging. */
- e_methods.trace_level++;
- break;
- case '?':
- default:
- usage(argv[0]);
- break;
- }
-
- /* If -d appeared, print version identification */
- if (e_methods.trace_level > 0)
- fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",
- JVERSION, JCOPYRIGHT);
-
- /* Select the input and output files */
-
- #ifdef TWO_FILE_COMMANDLINE
-
- if (optind != argc-2) {
- fprintf(stderr, "%s: must name one input and one output file\n", argv[0]);
- usage(argv[0]);
- }
- if ((cinfo.input_file = fopen(argv[optind], READ_BINARY)) == NULL) {
- fprintf(stderr, "%s: can't open %s\n", argv[0], argv[optind]);
- exit(EXIT_FAILURE);
- }
- if ((cinfo.output_file = fopen(argv[optind+1], WRITE_BINARY)) == NULL) {
- fprintf(stderr, "%s: can't open %s\n", argv[0], argv[optind+1]);
- exit(EXIT_FAILURE);
- }
-
- #else /* not TWO_FILE_COMMANDLINE -- use Unix style */
-
- cinfo.input_file = stdin; /* default input file */
- cinfo.output_file = stdout; /* always the output file */
-
- if (optind < argc-1) {
- fprintf(stderr, "%s: only one input file\n", argv[0]);
- usage(argv[0]);
- }
- if (optind < argc) {
- if ((cinfo.input_file = fopen(argv[optind], READ_BINARY)) == NULL) {
- fprintf(stderr, "%s: can't open %s\n", argv[0], argv[optind]);
- exit(EXIT_FAILURE);
- }
- }
-
- #endif /* TWO_FILE_COMMANDLINE */
-
- /* Set up to read a JFIF or baseline-JPEG file. */
- /* A smarter UI would inspect the first few bytes of the input file */
- /* to determine its type. */
- #ifdef JFIF_SUPPORTED
- jselrjfif(&cinfo);
- #else
- You shoulda defined JFIF_SUPPORTED. /* deliberate syntax error */
- #endif
-
- /* Do it to it! */
- jpeg_decompress(&cinfo);
-
- /* All done. */
- exit(EXIT_SUCCESS);
- return 0; /* suppress no-return-value warnings */
- }
-