515 lines
15 KiB
C
515 lines
15 KiB
C
/*
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* jdmain.c
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*
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* Copyright (C) 1991, 1992, 1993, 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 "jinclude.h"
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#ifdef INCLUDES_ARE_ANSI
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#include <stdlib.h> /* to declare exit() */
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#endif
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#include <ctype.h> /* to declare isupper(), tolower() */
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#ifdef NEED_SIGNAL_CATCHER
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#include <signal.h> /* to declare signal() */
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#endif
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#ifdef USE_SETMODE
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#include <fcntl.h> /* to declare setmode() */
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#endif
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#ifdef THINK_C
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#include <console.h> /* command-line reader for Macintosh */
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#endif
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#ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */
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#define READ_BINARY "r"
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#define WRITE_BINARY "w"
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#else
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#define READ_BINARY "rb"
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#define WRITE_BINARY "wb"
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#endif
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#ifndef EXIT_FAILURE /* define exit() codes if not provided */
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#define EXIT_FAILURE 1
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#endif
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#ifndef EXIT_SUCCESS
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#ifdef VMS
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#define EXIT_SUCCESS 1 /* VMS is very nonstandard */
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#else
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#define EXIT_SUCCESS 0
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#endif
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#endif
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#include "jversion.h" /* for version message */
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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_GIF, /* GIF format */
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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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* This routine gets control after the input file header has been read.
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* It must determine what output file format is to be written,
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* and make any other decompression parameter changes that are desirable.
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*/
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METHODDEF void
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d_ui_method_selection (decompress_info_ptr cinfo)
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{
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/* if grayscale or CMYK input, force similar output; */
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/* else leave the output colorspace as set by options. */
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if (cinfo->jpeg_color_space == CS_GRAYSCALE)
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cinfo->out_color_space = CS_GRAYSCALE;
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else if (cinfo->jpeg_color_space == CS_CMYK)
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cinfo->out_color_space = CS_CMYK;
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/* select output file format */
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/* Note: jselwxxx routine may make additional parameter changes,
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* such as forcing color quantization if it's a colormapped format.
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*/
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switch (requested_fmt) {
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#ifdef GIF_SUPPORTED
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case FMT_GIF:
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jselwgif(cinfo);
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break;
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#endif
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#ifdef PPM_SUPPORTED
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case FMT_PPM:
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jselwppm(cinfo);
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break;
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#endif
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#ifdef RLE_SUPPORTED
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case FMT_RLE:
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jselwrle(cinfo);
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break;
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#endif
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#ifdef TARGA_SUPPORTED
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case FMT_TARGA:
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jselwtarga(cinfo);
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break;
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#endif
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default:
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ERREXIT(cinfo->emethods, "Unsupported output file format");
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break;
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}
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}
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/*
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* Signal catcher to ensure that temporary files are removed before aborting.
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* NB: for Amiga Manx C this is actually a global routine named _abort();
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* see -Dsignal_catcher=_abort in CFLAGS. Talk about bogus...
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*/
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#ifdef NEED_SIGNAL_CATCHER
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static external_methods_ptr emethods; /* for access to free_all */
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GLOBAL void
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signal_catcher (int signum)
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{
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if (emethods != NULL) {
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emethods->trace_level = 0; /* turn off trace output */
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(*emethods->free_all) (); /* clean up memory allocation & temp files */
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}
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exit(EXIT_FAILURE);
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}
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#endif
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/*
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* Optional routine to display a percent-done figure on stderr.
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* See jddeflts.c for explanation of the information used.
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*/
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#ifdef PROGRESS_REPORT
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METHODDEF void
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progress_monitor (decompress_info_ptr cinfo, long loopcounter, long looplimit)
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{
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if (cinfo->total_passes > 1) {
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fprintf(stderr, "\rPass %d/%d: %3d%% ",
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cinfo->completed_passes+1, cinfo->total_passes,
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(int) (loopcounter*100L/looplimit));
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} else {
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fprintf(stderr, "\r %3d%% ",
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(int) (loopcounter*100L/looplimit));
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}
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fflush(stderr);
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}
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#endif
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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 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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#ifdef GIF_SUPPORTED
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fprintf(stderr, " -gif Select GIF output format\n");
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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 (default)\n");
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#endif
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fprintf(stderr, " -quantize N Same as -colors N\n");
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#ifdef RLE_SUPPORTED
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fprintf(stderr, " -rle Select Utah RLE output format\n");
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#endif
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#ifdef TARGA_SUPPORTED
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fprintf(stderr, " -targa Select Targa output format\n");
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#endif
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fprintf(stderr, "Switches for advanced users:\n");
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#ifdef BLOCK_SMOOTHING_SUPPORTED
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fprintf(stderr, " -blocksmooth Apply cross-block smoothing\n");
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#endif
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fprintf(stderr, " -grayscale Force grayscale output\n");
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fprintf(stderr, " -nodither Don't use dithering in quantization\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, " -verbose or -debug Emit debug output\n");
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exit(EXIT_FAILURE);
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}
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LOCAL boolean
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keymatch (char * arg, const char * keyword, int minchars)
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/* Case-insensitive matching of (possibly abbreviated) keyword switches. */
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/* keyword is the constant keyword (must be lower case already), */
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/* minchars is length of minimum legal abbreviation. */
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{
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register int ca, ck;
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register int nmatched = 0;
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while ((ca = *arg++) != '\0') {
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if ((ck = *keyword++) == '\0')
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return FALSE; /* arg longer than keyword, no good */
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if (isupper(ca)) /* force arg to lcase (assume ck is already) */
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ca = tolower(ca);
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if (ca != ck)
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return FALSE; /* no good */
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nmatched++; /* count matched characters */
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}
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/* reached end of argument; fail if it's too short for unique abbrev */
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if (nmatched < minchars)
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return FALSE;
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return TRUE; /* A-OK */
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}
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LOCAL int
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parse_switches (decompress_info_ptr cinfo, int last_file_arg_seen,
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int argc, char **argv)
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/* Initialize cinfo with default switch settings, then parse option 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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*/
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{
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int argn;
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char * arg;
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/* (Re-)initialize the system-dependent error and memory managers. */
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jselerror(cinfo->emethods); /* error/trace message routines */
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jselmemmgr(cinfo->emethods); /* memory allocation routines */
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cinfo->methods->d_ui_method_selection = d_ui_method_selection;
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/* Now OK to enable signal catcher. */
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#ifdef NEED_SIGNAL_CATCHER
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emethods = cinfo->emethods;
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#endif
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/* Set up default JPEG parameters. */
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j_d_defaults(cinfo, TRUE);
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requested_fmt = DEFAULT_FMT; /* set default output file format */
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outfilename = NULL;
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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, "blocksmooth", 1)) {
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/* Enable cross-block smoothing. */
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cinfo->do_block_smoothing = TRUE;
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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, "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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if (last_file_arg_seen == 0 && cinfo->emethods->trace_level == 0)
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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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cinfo->emethods->trace_level++;
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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 = CS_GRAYSCALE;
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} else if (keymatch(arg, "maxmemory", 1)) {
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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->emethods->max_memory_to_use = lval * 1000L;
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} else if (keymatch(arg, "nodither", 3)) {
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/* Suppress dithering in color quantization. */
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cinfo->use_dithering = FALSE;
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} else if (keymatch(arg, "onepass", 1)) {
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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, "outfile", 3)) {
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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, "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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* The main program.
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*/
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GLOBAL int
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main (int argc, char **argv)
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{
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struct Decompress_info_struct cinfo;
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struct Decompress_methods_struct dc_methods;
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struct External_methods_struct e_methods;
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int file_index;
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/* On Mac, fetch a command line. */
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#ifdef THINK_C
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argc = ccommand(&argv);
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#endif
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progname = argv[0];
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/* Set up links to method structures. */
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cinfo.methods = &dc_methods;
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cinfo.emethods = &e_methods;
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/* Install, but don't yet enable signal catcher. */
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#ifdef NEED_SIGNAL_CATCHER
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emethods = NULL;
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signal(SIGINT, signal_catcher);
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#ifdef SIGTERM /* not all systems have SIGTERM */
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signal(SIGTERM, signal_catcher);
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#endif
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#endif
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/* Scan command line: set up compression parameters, find file names. */
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file_index = parse_switches(&cinfo, 0, argc, argv);
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#ifdef TWO_FILE_COMMANDLINE
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/* Must have either -outfile switch or explicit output file name */
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if (outfilename == NULL) {
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if (file_index != argc-2) {
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fprintf(stderr, "%s: must name one input and one output file\n",
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progname);
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usage();
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}
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outfilename = argv[file_index+1];
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} else {
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if (file_index != argc-1) {
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fprintf(stderr, "%s: must name one input and one output file\n",
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progname);
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usage();
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}
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}
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#else
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/* Unix style: expect zero or one file name */
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if (file_index < argc-1) {
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fprintf(stderr, "%s: only one input file\n", progname);
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usage();
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}
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#endif /* TWO_FILE_COMMANDLINE */
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/* Open the input file. */
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if (file_index < argc) {
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if ((cinfo.input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
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fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
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exit(EXIT_FAILURE);
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}
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} else {
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/* default input file is stdin */
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#ifdef USE_SETMODE /* need to hack file mode? */
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setmode(fileno(stdin), O_BINARY);
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#endif
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#ifdef USE_FDOPEN /* need to re-open in binary mode? */
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if ((cinfo.input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
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fprintf(stderr, "%s: can't open stdin\n", progname);
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exit(EXIT_FAILURE);
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}
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#else
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cinfo.input_file = stdin;
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#endif
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}
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/* Open the output file. */
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if (outfilename != NULL) {
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if ((cinfo.output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
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fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
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exit(EXIT_FAILURE);
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}
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} else {
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/* default output file is stdout */
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#ifdef USE_SETMODE /* need to hack file mode? */
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setmode(fileno(stdout), O_BINARY);
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#endif
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#ifdef USE_FDOPEN /* need to re-open in binary mode? */
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if ((cinfo.output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
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fprintf(stderr, "%s: can't open stdout\n", progname);
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exit(EXIT_FAILURE);
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}
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#else
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cinfo.output_file = stdout;
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#endif
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}
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/* Set up to read a JFIF or baseline-JPEG file. */
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/* A smarter UI would inspect the first few bytes of the input file */
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/* to determine its type. */
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#ifdef JFIF_SUPPORTED
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jselrjfif(&cinfo);
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#else
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You shoulda defined JFIF_SUPPORTED. /* deliberate syntax error */
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#endif
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#ifdef PROGRESS_REPORT
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/* Start up progress display, unless trace output is on */
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if (e_methods.trace_level == 0)
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dc_methods.progress_monitor = progress_monitor;
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#endif
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/* Do it to it! */
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jpeg_decompress(&cinfo);
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#ifdef PROGRESS_REPORT
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/* Clear away progress display */
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if (e_methods.trace_level == 0) {
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fprintf(stderr, "\r \r");
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fflush(stderr);
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}
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#endif
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/* All done. */
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exit(EXIT_SUCCESS);
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return 0; /* suppress no-return-value warnings */
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|
}
|