/*

* djpeg.c

*

* Copyright (C) 1991-1997, Thomas G. Lane.

* Modified 2009-2015 by Guido Vollbeding.

* 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.

* To simplify script writing, the "-outfile" switch is provided. The syntax

* djpeg [options] -outfile outputfile inputfile

* works regardless of which command line style is used.

*/

#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */

#include "jversion.h" /* for version message */

#include <ctype.h> /* to declare isprint() */

#ifdef USE_CCOMMAND /* command-line reader for Macintosh */

#ifdef __MWERKS__

#include <SIOUX.h> /* Metrowerks needs this */

#include <console.h> /* ... and this */

#endif

#ifdef THINK_C

#include <console.h> /* Think declares it here */

#endif

#endif

/* Create the add-on message string table. */

#define JMESSAGE(code,string) string ,

static const char * const cdjpeg_message_table[] = {

#include "cderror.h"

NULL

};

/*

* 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_BMP, /* BMP format (Windows flavor) */

FMT_GIF, /* GIF format */

FMT_OS2, /* BMP format (OS/2 flavor) */

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;

/*

* 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 const char * progname; /* program name for error messages */

static char * outfilename; /* for -outfile switch */

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");

fprintf(stderr, " -fast Fast, low-quality processing\n");

fprintf(stderr, " -grayscale Force grayscale output\n");

fprintf(stderr, " -rgb Force RGB output\n");

#ifdef IDCT_SCALING_SUPPORTED

fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");

#endif

#ifdef BMP_SUPPORTED

fprintf(stderr, " -bmp Select BMP output format (Windows style)%s\n",

(DEFAULT_FMT == FMT_BMP ? " (default)" : ""));

#endif

#ifdef GIF_SUPPORTED

fprintf(stderr, " -gif Select GIF output format%s\n",

(DEFAULT_FMT == FMT_GIF ? " (default)" : ""));

#endif

#ifdef BMP_SUPPORTED

fprintf(stderr, " -os2 Select BMP output format (OS/2 style)%s\n",

(DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));

#endif

#ifdef PPM_SUPPORTED

fprintf(stderr, " -pnm Select PBMPLUS (PPM/PGM) output format%s\n",

(DEFAULT_FMT == FMT_PPM ? " (default)" : ""));

#endif

#ifdef RLE_SUPPORTED

fprintf(stderr, " -rle Select Utah RLE output format%s\n",

(DEFAULT_FMT == FMT_RLE ? " (default)" : ""));

#endif

#ifdef TARGA_SUPPORTED

fprintf(stderr, " -targa Select Targa output format%s\n",

(DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));

#endif

fprintf(stderr, "Switches for advanced users:\n");

#ifdef DCT_ISLOW_SUPPORTED

fprintf(stderr, " -dct int Use integer DCT method%s\n",

(JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));

#endif

#ifdef DCT_IFAST_SUPPORTED

fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",

(JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));

#endif

#ifdef DCT_FLOAT_SUPPORTED

fprintf(stderr, " -dct float Use floating-point DCT method%s\n",

(JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));

#endif

fprintf(stderr, " -dither fs Use F-S dithering (default)\n");

fprintf(stderr, " -dither none Don't use dithering in quantization\n");

fprintf(stderr, " -dither ordered Use ordered dither (medium speed, quality)\n");

#ifdef QUANT_2PASS_SUPPORTED

fprintf(stderr, " -map FILE Map to colors used in named image file\n");

#endif

fprintf(stderr, " -nosmooth Don't use high-quality upsampling\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, " -outfile name Specify name for output file\n");

fprintf(stderr, " -verbose or -debug Emit debug output\n");

exit(EXIT_FAILURE);

}

LOCAL(int)

parse_switches (j_decompress_ptr cinfo, int argc, char **argv,

int last_file_arg_seen, boolean for_real)

/* Parse optional 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.)

* for_real is FALSE on the first (dummy) pass; we may skip any expensive

* processing.

*/

{

int argn;

char * arg;

/* Set up default JPEG parameters. */

requested_fmt = DEFAULT_FMT; /* set default output file format */

outfilename = NULL;

cinfo->err->trace_level = 0;

/* 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) {

outfilename = NULL; /* -outfile applies to just one input file */

continue; /* ignore this name if previously processed */

}

break; /* else done parsing switches */

}

arg++; /* advance past switch marker character */

if (keymatch(arg, "bmp", 1)) {

/* BMP output format. */

requested_fmt = FMT_BMP;

} 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, "dct", 2)) {

/* Select IDCT algorithm. */

if (++argn >= argc) /* advance to next argument */

usage();

if (keymatch(argv[argn], "int", 1)) {

cinfo->dct_method = JDCT_ISLOW;

} else if (keymatch(argv[argn], "fast", 2)) {

cinfo->dct_method = JDCT_IFAST;

} else if (keymatch(argv[argn], "float", 2)) {

cinfo->dct_method = JDCT_FLOAT;

} else

usage();

} else if (keymatch(arg, "dither", 2)) {

/* Select dithering algorithm. */

if (++argn >= argc) /* advance to next argument */

usage();

if (keymatch(argv[argn], "fs", 2)) {

cinfo->dither_mode = JDITHER_FS;

} else if (keymatch(argv[argn], "none", 2)) {

cinfo->dither_mode = JDITHER_NONE;

} else if (keymatch(argv[argn], "ordered", 2)) {

cinfo->dither_mode = JDITHER_ORDERED;

} else

usage();

} else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {

/* Enable debug printouts. */

/* On first -d, print version identification */

static boolean printed_version = FALSE;

if (! printed_version) {

fprintf(stderr, "Independent JPEG Group's DJPEG, version %s\n%s\n",

JVERSION, JCOPYRIGHT);

printed_version = TRUE;

}

cinfo->err->trace_level++;

} else if (keymatch(arg, "fast", 1)) {

/* Select recommended processing options for quick-and-dirty output. */

cinfo->two_pass_quantize = FALSE;

cinfo->dither_mode = JDITHER_ORDERED;

if (! cinfo->quantize_colors) /* don't override an earlier -colors */

cinfo->desired_number_of_colors = 216;

cinfo->dct_method = JDCT_FASTEST;

cinfo->do_fancy_upsampling = FALSE;

} 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 = JCS_GRAYSCALE;

} else if (keymatch(arg, "rgb", 3)) {

/* Force RGB output. */

cinfo->out_color_space = JCS_RGB;

} else if (keymatch(arg, "map", 3)) {

/* Quantize to a color map taken from an input file. */

if (++argn >= argc) /* advance to next argument */

usage();

if (for_real) { /* too expensive to do twice! */

#ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */

FILE * mapfile;

if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {

fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);

exit(EXIT_FAILURE);

}

read_color_map(cinfo, mapfile);

fclose(mapfile);

cinfo->quantize_colors = TRUE;

#else

ERREXIT(cinfo, JERR_NOT_COMPILED);

#endif

}

} else if (keymatch(arg, "maxmemory", 3)) {

/* 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->mem->max_memory_to_use = lval * 1000L;

} else if (keymatch(arg, "nosmooth", 3)) {

/* Suppress fancy upsampling. */

cinfo->do_fancy_upsampling = FALSE;

} else if (keymatch(arg, "onepass", 3)) {

/* Use fast one-pass quantization. */

cinfo->two_pass_quantize = FALSE;

} else if (keymatch(arg, "os2", 3)) {

/* BMP output format (OS/2 flavor). */

requested_fmt = FMT_OS2;

} else if (keymatch(arg, "outfile", 4)) {

/* Set output file name. */

if (++argn >= argc) /* advance to next argument */

usage();

outfilename = argv[argn]; /* save it away for later use */

} else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 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, "scale", 1)) {

/* Scale the output image by a fraction M/N. */

if (++argn >= argc) /* advance to next argument */

usage();

if (sscanf(argv[argn], "%u/%u",

&cinfo->scale_num, &cinfo->scale_denom) < 1)

usage();

} 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) */

}

/*

* Marker processor for COM and interesting APPn markers.

* This replaces the library's built-in processor, which just skips the marker.

* We want to print out the marker as text, to the extent possible.

* Note this code relies on a non-suspending data source.

*/

LOCAL(unsigned int)

jpeg_getc (j_decompress_ptr cinfo)

/* Read next byte */

{

struct jpeg_source_mgr * datasrc = cinfo->src;

if (datasrc->bytes_in_buffer == 0) {

if (! (*datasrc->fill_input_buffer) (cinfo))

ERREXIT(cinfo, JERR_CANT_SUSPEND);

}

datasrc->bytes_in_buffer--;

return GETJOCTET(*datasrc->next_input_byte++);

}

METHODDEF(boolean)

print_text_marker (j_decompress_ptr cinfo)

{

boolean traceit = (cinfo->err->trace_level >= 1);

INT32 length;

unsigned int ch;

unsigned int lastch = 0;

length = jpeg_getc(cinfo) << 8;

length += jpeg_getc(cinfo);

length -= 2; /* discount the length word itself */

if (traceit) {

if (cinfo->unread_marker == JPEG_COM)

fprintf(stderr, "Comment, length %ld:\n", (long) length);

else /* assume it is an APPn otherwise */

fprintf(stderr, "APP%d, length %ld:\n",

cinfo->unread_marker - JPEG_APP0, (long) length);

}

while (--length >= 0) {

ch = jpeg_getc(cinfo);

if (traceit) {

/* Emit the character in a readable form.

* Nonprintables are converted to \nnn form,

* while \ is converted to \\.

* Newlines in CR, CR/LF, or LF form will be printed as one newline.

*/

if (ch == '\r') {

fprintf(stderr, "\n");

} else if (ch == '\n') {

if (lastch != '\r')

fprintf(stderr, "\n");

} else if (ch == '\\') {

fprintf(stderr, "\\\\");

} else if (isprint(ch)) {

putc(ch, stderr);

} else {

fprintf(stderr, "\\%03o", ch);

}

lastch = ch;

}

}

if (traceit)

fprintf(stderr, "\n");

return TRUE;

}

/*

* The main program.

*/

int

main (int argc, char **argv)

{

struct jpeg_decompress_struct cinfo;

struct jpeg_error_mgr jerr;

#ifdef PROGRESS_REPORT

struct cdjpeg_progress_mgr progress;

#endif

int file_index;

djpeg_dest_ptr dest_mgr = NULL;

FILE * input_file;

FILE * output_file;

JDIMENSION num_scanlines;

/* On Mac, fetch a command line. */

#ifdef USE_CCOMMAND

argc = ccommand(&argv);

#endif

progname = argv[0];

if (progname == NULL || progname[0] == 0)

progname = "djpeg"; /* in case C library doesn't provide it */

/* Initialize the JPEG decompression object with default error handling. */

cinfo.err = jpeg_std_error(&jerr);

jpeg_create_decompress(&cinfo);

/* Add some application-specific error messages (from cderror.h) */

jerr.addon_message_table = cdjpeg_message_table;

jerr.first_addon_message = JMSG_FIRSTADDONCODE;

jerr.last_addon_message = JMSG_LASTADDONCODE;

/* Insert custom marker processor for COM and APP12.

* APP12 is used by some digital camera makers for textual info,

* so we provide the ability to display it as text.

* If you like, additional APPn marker types can be selected for display,

* but don't try to override APP0 or APP14 this way (see libjpeg.doc).

*/

jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);

jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);

/* Now safe to enable signal catcher. */

#ifdef NEED_SIGNAL_CATCHER

enable_signal_catcher((j_common_ptr) &cinfo);

#endif

/* Scan command line to find file names. */

/* It is convenient to use just one switch-parsing routine, but the switch

* values read here are ignored; we will rescan the switches after opening

* the input file.

* (Exception: tracing level set here controls verbosity for COM markers

* found during jpeg_read_header...)

*/

file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);

#ifdef TWO_FILE_COMMANDLINE

/* Must have either -outfile switch or explicit output file name */

if (outfilename == NULL) {

if (file_index != argc-2) {

fprintf(stderr, "%s: must name one input and one output file\n",

progname);

usage();

}

outfilename = argv[file_index+1];

} else {

if (file_index != argc-1) {

fprintf(stderr, "%s: must name one input and one output file\n",

progname);

usage();

}

}

#else

/* Unix style: expect zero or one file name */

if (file_index < argc-1) {

fprintf(stderr, "%s: only one input file\n", progname);

usage();

}

#endif /* TWO_FILE_COMMANDLINE */

/* Open the input file. */

if (file_index < argc) {

if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {

fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);

exit(EXIT_FAILURE);

}

} else {

/* default input file is stdin */

input_file = read_stdin();

}

/* Open the output file. */

if (outfilename != NULL) {

if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {

fprintf(stderr, "%s: can't open %s\n", progname, outfilename);

exit(EXIT_FAILURE);

}

} else {

/* default output file is stdout */

output_file = write_stdout();

}

#ifdef PROGRESS_REPORT

start_progress_monitor((j_common_ptr) &cinfo, &progress);

#endif

/* Specify data source for decompression */

jpeg_stdio_src(&cinfo, input_file);

/* Read file header, set default decompression parameters */

(void) jpeg_read_header(&cinfo, TRUE);

/* Adjust default decompression parameters by re-parsing the options */

file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);

/* Initialize the output module now to let it override any crucial

* option settings (for instance, GIF wants to force color quantization).

*/

switch (requested_fmt) {

#ifdef BMP_SUPPORTED

case FMT_BMP:

dest_mgr = jinit_write_bmp(&cinfo, FALSE);

break;

case FMT_OS2:

dest_mgr = jinit_write_bmp(&cinfo, TRUE);

break;

#endif

#ifdef GIF_SUPPORTED

case FMT_GIF:

dest_mgr = jinit_write_gif(&cinfo);

break;

#endif

#ifdef PPM_SUPPORTED

case FMT_PPM:

dest_mgr = jinit_write_ppm(&cinfo);

break;

#endif

#ifdef RLE_SUPPORTED

case FMT_RLE:

dest_mgr = jinit_write_rle(&cinfo);

break;

#endif

#ifdef TARGA_SUPPORTED

case FMT_TARGA:

dest_mgr = jinit_write_targa(&cinfo);

break;

#endif

default:

ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);

break;

}

dest_mgr->output_file = output_file;

/* Start decompressor */

(void) jpeg_start_decompress(&cinfo);

/* Write output file header */

(*dest_mgr->start_output) (&cinfo, dest_mgr);

/* Process data */

while (cinfo.output_scanline < cinfo.output_height) {

num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,

dest_mgr->buffer_height);

(*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);

}

#ifdef PROGRESS_REPORT

/* Hack: count final pass as done in case finish_output does an extra pass.

* The library won't have updated completed_passes.

*/

progress.pub.completed_passes = progress.pub.total_passes;

#endif

/* Finish decompression and release memory.

* I must do it in this order because output module has allocated memory

* of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.

*/

(*dest_mgr->finish_output) (&cinfo, dest_mgr);

(void) jpeg_finish_decompress(&cinfo);

jpeg_destroy_decompress(&cinfo);

/* Close files, if we opened them */

if (input_file != stdin)

fclose(input_file);

if (output_file != stdout)

fclose(output_file);

#ifdef PROGRESS_REPORT

end_progress_monitor((j_common_ptr) &cinfo);

#endif

/* All done. */

exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);

return 0; /* suppress no-return-value warnings */

}