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JDMAIN.C
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1992-04-04
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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 an MS-DOS user interface for the JPEG decompressor.
* It follows DOS practice more closely than does the standard jdmain.c.
* This compiles under Borland C or Microsoft C; don't know about others.
* If you are using jmemnobs.c, #define FREE_MEM_ESTIMATE=0.
*/
#include "jinclude.h"
#include <stdlib.h> /* to declare exit() */
#include <string.h> /* string functions */
#include <signal.h> /* to declare signal() */
#ifdef __TURBOC__
/* Borland C declarations */
#include <dir.h> /* for findfirst/findnext */
typedef struct ffblk FF_DATA;
#define FF_NAME ff_name
#define FINDFIRST(path,blk) findfirst(path, blk, 0)
#define FINDNEXT(blk) findnext(blk)
#include <alloc.h> /* for farcoreleft() */
/* In Borland C, force -m equal to 95% of farcoreleft figure */
#define FREE_MEM_ESTIMATE ((farcoreleft() * 95L) / 100L)
#else /* !__TURBOC__ */
/* Microsoft C declarations */
#include <dos.h> /* for findfirst/findnext */
typedef struct find_t FF_DATA;
#define FF_NAME name
#define FINDFIRST(path,blk) _dos_findfirst(path, _A_NORMAL, blk)
#define FINDNEXT(blk) _dos_findnext(blk)
#endif /* __TURBOC__ */
#define READ_BINARY "rb"
#define WRITE_BINARY "wb"
#ifndef EXIT_FAILURE /* define exit() codes if not provided */
#define EXIT_FAILURE 1
#endif
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#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 GIF_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_GIF
#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.
* Doesn't do anything during intervals where emethods is NULL.
*/
static external_methods_ptr emethods; /* for access to free_all */
LOCAL 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);
}
LOCAL void
usage (void)
/* complain about bad command line */
{
fprintf(stderr, "Usage: djpeg [switches] inputfile(s)\n");
fprintf(stderr, "List of input files may use wildcards (* and ?)\n");
fprintf(stderr, "If input file name has no extension, .JPG is assumed\n");
fprintf(stderr, "Output filename is same as input filename, except for extension\n");
fprintf(stderr, "Optional switches:\n");
#ifdef GIF_SUPPORTED
fprintf(stderr, " -G Select GIF output, extension .GIF (default)\n");
#endif
#ifdef PPM_SUPPORTED
fprintf(stderr, " -P Select PPM/PGM output, extension .PPM\n");
#endif
#ifdef RLE_SUPPORTED
fprintf(stderr, " -R Select Utah RLE output, extension .RLE\n");
#endif
#ifdef TARGA_SUPPORTED
fprintf(stderr, " -T Select Targa output, extension .TGA\n");
#endif
fprintf(stderr, " -g Force grayscale output\n");
fprintf(stderr, " -q colors Quantize to no more than N colors\n");
fprintf(stderr, " -1 Use 1-pass quantization (fast, low quality)\n");
fprintf(stderr, " -D Don't use dithering in quantization\n");
fprintf(stderr, " -b Apply cross-block smoothing\n");
#ifndef FREE_MEM_ESTIMATE
fprintf(stderr, " -m memory Maximum memory to use (default 300K); see USAGE\n");
#endif
fprintf(stderr, " -d Generate debug output\n");
exit(EXIT_FAILURE);
}
/* Display 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);
}
/*
* Check for overwrite of an existing file; clear it with user
*/
LOCAL boolean
is_write_ok (char * outfilename)
{
FILE * ofile;
int ch;
ofile = fopen(outfilename, READ_BINARY);
if (ofile == NULL)
return TRUE; /* not present */
fclose(ofile); /* oops, it is present */
for (;;) {
fprintf(stderr, "%s already exists, overwrite it? [y/n] ",
outfilename);
fflush(stderr);
ch = getc(stdin);
fflush(stdin); /* flush rest of line */
switch (ch) {
case 'Y':
case 'y':
return TRUE;
case 'N':
case 'n':
return FALSE;
/* otherwise, ask again */
}
}
}
/*
* Save current switch values here --- necessary for multiple input files!
*/
static boolean b_smooth; /* -b */
static boolean gray_scale; /* -g */
static int num_colors; /* -q, or 0 if not seen */
static boolean two_pass_q; /* not -1 */
static boolean do_dither; /* not -D */
static long cur_mem; /* -m, or value of FREE_MEM_ESTIMATE */
static int cur_trace; /* -d */
#define MAX_FNAME_LEN 150
/*
* Process a single input file
*/
LOCAL void
process_one_file (char * infilename)
{
struct decompress_info_struct cinfo;
struct decompress_methods_struct dc_methods;
struct external_methods_struct e_methods;
char outfilename[MAX_FNAME_LEN];
int i;
/* Select the input and output files */
if ((cinfo.input_file = fopen(infilename, READ_BINARY)) == NULL) {
fprintf(stderr, "djpeg: can't open %s\n", infilename);
return;
}
/* Make outfilename be infilename with appropriate extension */
strcpy(outfilename, infilename);
for (i = strlen(outfilename)-1; i >= 0; i--) {
switch (outfilename[i]) {
case ':':
case '/':
case '\\':
i = 0; /* stop scanning */
break;
case '.':
outfilename[i] = '\0'; /* lop off existing extension */
i = 0; /* stop scanning */
break;
default:
break; /* keep scanning */
}
}
switch (requested_fmt) {
case FMT_GIF:
strcat(outfilename, ".GIF");
break;
case FMT_PPM:
strcat(outfilename, ".PPM");
break;
case FMT_RLE:
strcat(outfilename, ".RLE");
break;
case FMT_TARGA:
strcat(outfilename, ".TGA");
break;
}
if (! is_write_ok(outfilename)) {
fclose(cinfo.input_file);
return;
}
if ((cinfo.output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
fprintf(stderr, "djpeg: can't create %s\n", outfilename);
fclose(cinfo.input_file);
return;
}
/* 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. */
emethods = &e_methods;
/* Set up JPEG parameters. */
j_d_defaults(&cinfo, TRUE);
cinfo.do_block_smoothing = b_smooth;
if (gray_scale)
cinfo.out_color_space = CS_GRAYSCALE;
if (num_colors > 0) {
cinfo.desired_number_of_colors = num_colors;
cinfo.quantize_colors = TRUE;
}
cinfo.two_pass_quantize = two_pass_q;
cinfo.use_dithering = do_dither;
e_methods.max_memory_to_use = cur_mem;
e_methods.trace_level = cur_trace;
/* Start up progress display, unless trace output is on */
fprintf(stderr, "Decompressing %s => %s\n", infilename, outfilename);
if (cur_trace == 0)
dc_methods.progress_monitor = progress_monitor;
/* 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);
/* Clear away progress display */
if (cur_trace == 0)
fprintf(stderr, "\r \r");
fflush(stderr);
/* All done. Close files, disable signal catcher */
fclose(cinfo.input_file);
fclose(cinfo.output_file);
emethods = NULL;
}
/*
* Process one filespec; expand wildcards
*/
LOCAL void
process_filespec (char * filespec)
{
FF_DATA ffblock;
char infilename[MAX_FNAME_LEN];
int pathlen, i;
boolean hasext;
/* Determine whether there is a path and an extension */
pathlen = 0;
hasext = FALSE;
for (i = strlen(filespec)-1; i >= 0; i--) {
switch (filespec[i]) {
case ':':
case '/':
case '\\':
pathlen = i+1; /* path part ends here */
i = 0; /* stop scanning */
break;
case '.':
hasext = TRUE; /* there is an extension */
break;
default:
break; /* keep scanning */
}
}
/* Make infilename be filespec; if no explicit extension, attach .JPG */
strcpy(infilename, filespec);
if (! hasext)
strcat(infilename, ".JPG");
/* Scan over matching files */
if (FINDFIRST(infilename, &ffblock) != 0) {
fprintf(stderr, "No files matching %s\n", infilename);
} else {
do {
strcpy(infilename, filespec);
strcpy(infilename + pathlen, ffblock.FF_NAME);
process_one_file(infilename);
} while (FINDNEXT(&ffblock) == 0);
}
}
/*
* The main program.
*/
GLOBAL int
main (int argc, char **argv)
{
int c;
/* Set up signal catcher. */
emethods = NULL;
signal(SIGINT, signal_catcher);
#ifdef SIGTERM /* not all systems have SIGTERM */
signal(SIGTERM, signal_catcher);
#endif
/* Scan command line, process switches */
requested_fmt = DEFAULT_FMT; /* initialize default switch values */
b_smooth = FALSE;
gray_scale = FALSE;
num_colors = 0;
two_pass_q = TRUE;
do_dither = TRUE;
#ifdef FREE_MEM_ESTIMATE
cur_mem = FREE_MEM_ESTIMATE;
#else
cur_mem = 300000L; /* reasonable default for DOS */
#endif
cur_trace = 0;
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. */
b_smooth = TRUE;
break;
case 'g': /* Force grayscale output. */
gray_scale = TRUE;
break;
case 'q': /* Do color quantization. */
if (optarg == NULL)
usage();
if (sscanf(optarg, "%d", &num_colors) != 1)
usage();
break;
case '1': /* Use fast one-pass quantization. */
two_pass_q = FALSE;
break;
case 'D': /* Suppress dithering in color quantization. */
do_dither = FALSE;
break;
case 'm': /* Maximum memory in Kb (or Mb with 'm'). */
{ long lval;
char ch = 'x';
if (optarg == NULL)
usage();
if (sscanf(optarg, "%ld%c", &lval, &ch) < 1)
usage();
if (ch == 'm' || ch == 'M')
lval *= 1000L;
cur_mem = lval * 1000L;
}
break;
case 'd': /* Debugging. */
/* On first -d, print version identification */
if (cur_trace == 0)
fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",
JVERSION, JCOPYRIGHT);
cur_trace++;
break;
case '?':
default:
usage();
break;
}
/* Process file specifications */
if (optind >= argc)
usage(); /* no filespecs?? */
while (optind < argc)
process_filespec(argv[optind++]);
/* All done. */
exit(EXIT_SUCCESS);
return 0; /* suppress no-return-value warnings */
}