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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 */
}
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