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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 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.
- */
-
- #include "jinclude.h"
- #ifdef INCLUDES_ARE_ANSI
- #include <stdlib.h> /* to declare exit() */
- #endif
- #include <ctype.h> /* to declare isupper(), tolower() */
- #ifdef NEED_SIGNAL_CATCHER
- #include <signal.h> /* to declare signal() */
- #endif
- #ifdef USE_SETMODE
- #include <fcntl.h> /* to declare setmode() */
- #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 */
-
-
- /*
- * 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)
- {
- if (emethods != NULL) {
- emethods->trace_level = 0; /* turn off trace output */
- (*emethods->free_all) (); /* clean up memory allocation & temp files */
- }
- exit(EXIT_FAILURE);
- }
-
- #endif
-
-
- /*
- * Optional routine to display a percent-done figure on stderr.
- * See jddeflts.c for explanation of the information used.
- */
-
- #ifdef PROGRESS_REPORT
-
- METHODDEF void
- progress_monitor (decompress_info_ptr cinfo, long loopcounter, long looplimit)
- {
- if (cinfo->total_passes > 1) {
- fprintf(stderr, "\rPass %d/%d: %3d%% ",
- cinfo->completed_passes+1, cinfo->total_passes,
- (int) (loopcounter*100L/looplimit));
- } else {
- fprintf(stderr, "\r %3d%% ",
- (int) (loopcounter*100L/looplimit));
- }
- fflush(stderr);
- }
-
- #endif
-
-
- /*
- * 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 char * progname; /* program name for error messages */
-
-
- 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");
- #ifdef GIF_SUPPORTED
- fprintf(stderr, " -gif Select GIF output format\n");
- #endif
- #ifdef PPM_SUPPORTED
- fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format (default)\n");
- #endif
- fprintf(stderr, " -quantize N Same as -colors N\n");
- #ifdef RLE_SUPPORTED
- fprintf(stderr, " -rle Select Utah RLE output format\n");
- #endif
- #ifdef TARGA_SUPPORTED
- fprintf(stderr, " -targa Select Targa output format\n");
- #endif
- fprintf(stderr, "Switches for advanced users:\n");
- #ifdef BLOCK_SMOOTHING_SUPPORTED
- fprintf(stderr, " -blocksmooth Apply cross-block smoothing\n");
- #endif
- fprintf(stderr, " -grayscale Force grayscale output\n");
- fprintf(stderr, " -nodither Don't use dithering in quantization\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, " -verbose or -debug Emit debug output\n");
- exit(EXIT_FAILURE);
- }
-
-
- LOCAL boolean
- keymatch (char * arg, const char * keyword, int minchars)
- /* Case-insensitive matching of (possibly abbreviated) keyword switches. */
- /* keyword is the constant keyword (must be lower case already), */
- /* minchars is length of minimum legal abbreviation. */
- {
- register int ca, ck;
- register int nmatched = 0;
-
- while ((ca = *arg++) != '\0') {
- if ((ck = *keyword++) == '\0')
- return FALSE; /* arg longer than keyword, no good */
- if (isupper(ca)) /* force arg to lcase (assume ck is already) */
- ca = tolower(ca);
- if (ca != ck)
- return FALSE; /* no good */
- nmatched++; /* count matched characters */
- }
- /* reached end of argument; fail if it's too short for unique abbrev */
- if (nmatched < minchars)
- return FALSE;
- return TRUE; /* A-OK */
- }
-
-
- LOCAL int
- parse_switches (decompress_info_ptr cinfo, int last_file_arg_seen,
- int argc, char **argv)
- /* Initialize cinfo with default switch settings, then parse option 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.)
- */
- {
- int argn;
- char * arg;
-
- /* (Re-)initialize the system-dependent error and memory managers. */
- jselerror(cinfo->emethods); /* error/trace message routines */
- jselmemmgr(cinfo->emethods); /* memory allocation routines */
- cinfo->methods->d_ui_method_selection = d_ui_method_selection;
-
- /* Now OK to enable signal catcher. */
- #ifdef NEED_SIGNAL_CATCHER
- emethods = cinfo->emethods;
- #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 */
-
- 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)
- continue; /* ignore it if previously processed */
- break; /* else done parsing switches */
- }
- arg++; /* advance past switch marker character */
-
- if (keymatch(arg, "blocksmooth", 1)) {
- /* Enable cross-block smoothing. */
- cinfo->do_block_smoothing = TRUE;
-
- } 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, "debug", 1) || keymatch(arg, "verbose", 1)) {
- /* Enable debug printouts. */
- /* On first -d, print version identification */
- if (last_file_arg_seen == 0 && cinfo->emethods->trace_level == 0)
- fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",
- JVERSION, JCOPYRIGHT);
- cinfo->emethods->trace_level++;
-
- } 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 = CS_GRAYSCALE;
-
- } else if (keymatch(arg, "maxmemory", 1)) {
- /* 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->emethods->max_memory_to_use = lval * 1000L;
-
- } else if (keymatch(arg, "nodither", 3)) {
- /* Suppress dithering in color quantization. */
- cinfo->use_dithering = FALSE;
-
- } else if (keymatch(arg, "onepass", 1)) {
- /* Use fast one-pass quantization. */
- cinfo->two_pass_quantize = FALSE;
-
- } else if (keymatch(arg, "pnm", 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, "targa", 1)) {
- /* Targa output format. */
- requested_fmt = FMT_TARGA;
-
- } else {
- usage(); /* bogus switch */
- }
- }
-
- return argn; /* return index of next arg (file name) */
- }
-
-
- /*
- * 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 file_index;
-
- /* On Mac, fetch a command line. */
- #ifdef THINK_C
- argc = ccommand(&argv);
- #endif
-
- progname = argv[0];
-
- /* Set up links to method structures. */
- cinfo.methods = &dc_methods;
- cinfo.emethods = &e_methods;
-
- /* Install, but don't yet enable signal catcher. */
- #ifdef NEED_SIGNAL_CATCHER
- emethods = NULL;
- signal(SIGINT, signal_catcher);
- #ifdef SIGTERM /* not all systems have SIGTERM */
- signal(SIGTERM, signal_catcher);
- #endif
- #endif
-
- /* Scan command line: set up compression parameters, input & output files. */
-
- file_index = parse_switches(&cinfo, 0, argc, argv);
-
- #ifdef TWO_FILE_COMMANDLINE
-
- if (file_index != argc-2) {
- fprintf(stderr, "%s: must name one input and one output file\n", progname);
- usage();
- }
- if ((cinfo.input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
- fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
- exit(EXIT_FAILURE);
- }
- if ((cinfo.output_file = fopen(argv[file_index+1], WRITE_BINARY)) == NULL) {
- fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index+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 */
-
- #ifdef USE_SETMODE /* need to hack file mode? */
- setmode(fileno(stdin), O_BINARY);
- setmode(fileno(stdout), O_BINARY);
- #endif
-
- if (file_index < argc-1) {
- fprintf(stderr, "%s: only one input file\n", progname);
- usage();
- }
- if (file_index < argc) {
- if ((cinfo.input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
- fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
- 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
-
- #ifdef PROGRESS_REPORT
- /* Start up progress display, unless trace output is on */
- if (e_methods.trace_level == 0)
- dc_methods.progress_monitor = progress_monitor;
- #endif
-
- /* Do it to it! */
- jpeg_decompress(&cinfo);
-
- #ifdef PROGRESS_REPORT
- /* Clear away progress display */
- if (e_methods.trace_level == 0) {
- fprintf(stderr, "\r \r");
- fflush(stderr);
- }
- #endif
-
- /* All done. */
- exit(EXIT_SUCCESS);
- return 0; /* suppress no-return-value warnings */
- }
-