/*

* cjpeg.c

*

* Copyright (C) 1991-1998, Thomas G. Lane.

* Modified 2003-2011 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 compressor.

* 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:

* cjpeg [options] inputfile outputfile

* cjpeg [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

* cjpeg [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 */

#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 routine determines what format the input file is,

* and selects the appropriate input-reading module.

*

* To determine which family of input formats the file belongs to,

* we may look only at the first byte of the file, since C does not

* guarantee that more than one character can be pushed back with ungetc.

* Looking at additional bytes would require one of these approaches:

* 1) assume we can fseek() the input file (fails for piped input);

* 2) assume we can push back more than one character (works in

* some C implementations, but unportable);

* 3) provide our own buffering (breaks input readers that want to use

* stdio directly, such as the RLE library);

* or 4) don't put back the data, and modify the input_init methods to assume

* they start reading after the start of file (also breaks RLE library).

* #1 is attractive for MS-DOS but is untenable on Unix.

*

* The most portable solution for file types that can't be identified by their

* first byte is to make the user tell us what they are. This is also the

* only approach for "raw" file types that contain only arbitrary values.

* We presently apply this method for Targa files. Most of the time Targa

* files start with 0x00, so we recognize that case. Potentially, however,

* a Targa file could start with any byte value (byte 0 is the length of the

* seldom-used ID field), so we provide a switch to force Targa input mode.

*/

static boolean is_targa; /* records user -targa switch */

LOCAL(cjpeg_source_ptr)

select_file_type (j_compress_ptr cinfo, FILE * infile)

{

int c;

if (is_targa) {

#ifdef TARGA_SUPPORTED

return jinit_read_targa(cinfo);

#else

ERREXIT(cinfo, JERR_TGA_NOTCOMP);

#endif

}

if ((c = getc(infile)) == EOF)

ERREXIT(cinfo, JERR_INPUT_EMPTY);

if (ungetc(c, infile) == EOF)

ERREXIT(cinfo, JERR_UNGETC_FAILED);

switch (c) {

#ifdef BMP_SUPPORTED

case 'B':

return jinit_read_bmp(cinfo);

#endif

#ifdef GIF_SUPPORTED

case 'G':

return jinit_read_gif(cinfo);

#endif

#ifdef PPM_SUPPORTED

case 'P':

return jinit_read_ppm(cinfo);

#endif

#ifdef RLE_SUPPORTED

case 'R':

return jinit_read_rle(cinfo);

#endif

#ifdef TARGA_SUPPORTED

case 0x00:

return jinit_read_targa(cinfo);

#endif

default:

ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);

break;

}

return NULL; /* suppress compiler warnings */

}

/*

* 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, " -quality N[,...] Compression quality (0..100; 5-95 is useful range)\n");

fprintf(stderr, " -grayscale Create monochrome JPEG file\n");

fprintf(stderr, " -rgb Create RGB JPEG file\n");

#ifdef ENTROPY_OPT_SUPPORTED

fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");

#endif

#ifdef C_PROGRESSIVE_SUPPORTED

fprintf(stderr, " -progressive Create progressive JPEG file\n");

#endif

#ifdef DCT_SCALING_SUPPORTED

fprintf(stderr, " -scale M/N Scale image by fraction M/N, eg, 1/2\n");

#endif

#ifdef TARGA_SUPPORTED

fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n");

#endif

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

#ifdef C_ARITH_CODING_SUPPORTED

fprintf(stderr, " -arithmetic Use arithmetic coding\n");

#endif

#ifdef DCT_SCALING_SUPPORTED

fprintf(stderr, " -block N DCT block size (1..16; default is 8)\n");

#endif

#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, " -nosmooth Don't use high-quality downsampling\n");

fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");

#ifdef INPUT_SMOOTHING_SUPPORTED

fprintf(stderr, " -smooth N Smooth dithered input (N=1..100 is strength)\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");

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

fprintf(stderr, " -baseline Force baseline quantization tables\n");

fprintf(stderr, " -qtables file Use quantization tables given in file\n");

fprintf(stderr, " -qslots N[,...] Set component quantization tables\n");

fprintf(stderr, " -sample HxV[,...] Set component sampling factors\n");

#ifdef C_MULTISCAN_FILES_SUPPORTED

fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");

#endif

exit(EXIT_FAILURE);

}

LOCAL(int)

parse_switches (j_compress_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;

boolean force_baseline;

boolean simple_progressive;

char * qualityarg = NULL; /* saves -quality parm if any */

char * qtablefile = NULL; /* saves -qtables filename if any */

char * qslotsarg = NULL; /* saves -qslots parm if any */

char * samplearg = NULL; /* saves -sample parm if any */

char * scansarg = NULL; /* saves -scans parm if any */

/* Set up default JPEG parameters. */

force_baseline = FALSE; /* by default, allow 16-bit quantizers */

simple_progressive = FALSE;

is_targa = FALSE;

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, "arithmetic", 1)) {

/* Use arithmetic coding. */

#ifdef C_ARITH_CODING_SUPPORTED

cinfo->arith_code = TRUE;

#else

fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",

progname);

exit(EXIT_FAILURE);

#endif

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

/* Force baseline-compatible output (8-bit quantizer values). */

force_baseline = TRUE;

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

/* Set DCT block size. */

#if defined DCT_SCALING_SUPPORTED && JPEG_LIB_VERSION_MAJOR >= 8 && \

(JPEG_LIB_VERSION_MAJOR > 8 || JPEG_LIB_VERSION_MINOR >= 3)

int val;

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

usage();

if (sscanf(argv[argn], "%d", &val) != 1)

usage();

if (val < 1 || val > 16)

usage();

cinfo->block_size = val;

#else

fprintf(stderr, "%s: sorry, block size setting not supported\n",

progname);

exit(EXIT_FAILURE);

#endif

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

/* Select DCT 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, "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 CJPEG, version %s\n%s\n",

JVERSION, JCOPYRIGHT);

printed_version = TRUE;

}

cinfo->err->trace_level++;

} else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {

/* Force a monochrome JPEG file to be generated. */

jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);

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

/* Force an RGB JPEG file to be generated. */

jpeg_set_colorspace(cinfo, JCS_RGB);

} 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 downsampling */

cinfo->do_fancy_downsampling = FALSE;

} else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {

/* Enable entropy parm optimization. */

#ifdef ENTROPY_OPT_SUPPORTED

cinfo->optimize_coding = TRUE;

#else

fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",

progname);

exit(EXIT_FAILURE);

#endif

} 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, "progressive", 1)) {

/* Select simple progressive mode. */

#ifdef C_PROGRESSIVE_SUPPORTED

simple_progressive = TRUE;

/* We must postpone execution until num_components is known. */

#else

fprintf(stderr, "%s: sorry, progressive output was not compiled\n",

progname);

exit(EXIT_FAILURE);

#endif

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

/* Quality ratings (quantization table scaling factors). */

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

usage();

qualityarg = argv[argn];

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

/* Quantization table slot numbers. */

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

usage();

qslotsarg = argv[argn];

/* Must delay setting qslots until after we have processed any

* colorspace-determining switches, since jpeg_set_colorspace sets

* default quant table numbers.

*/

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

/* Quantization tables fetched from file. */

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

usage();

qtablefile = argv[argn];

/* We postpone actually reading the file in case -quality comes later. */

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

/* Restart interval in MCU rows (or in MCUs with 'b'). */

long lval;

char ch = 'x';

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

usage();

if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)

usage();

if (lval < 0 || lval > 65535L)

usage();

if (ch == 'b' || ch == 'B') {

cinfo->restart_interval = (unsigned int) lval;

cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */

} else {

cinfo->restart_in_rows = (int) lval;

/* restart_interval will be computed during startup */

}

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

/* Set sampling factors. */

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

usage();

samplearg = argv[argn];

/* Must delay setting sample factors until after we have processed any

* colorspace-determining switches, since jpeg_set_colorspace sets

* default sampling factors.

*/

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

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

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

usage();

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

&cinfo->scale_num, &cinfo->scale_denom) != 2)

usage();

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

/* Set scan script. */

#ifdef C_MULTISCAN_FILES_SUPPORTED

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

usage();

scansarg = argv[argn];

/* We must postpone reading the file in case -progressive appears. */

#else

fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",

progname);

exit(EXIT_FAILURE);

#endif

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

/* Set input smoothing factor. */

int val;

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

usage();

if (sscanf(argv[argn], "%d", &val) != 1)

usage();

if (val < 0 || val > 100)

usage();

cinfo->smoothing_factor = val;

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

/* Input file is Targa format. */

is_targa = TRUE;

} else {

usage(); /* bogus switch */

}

}

/* Post-switch-scanning cleanup */

if (for_real) {

/* Set quantization tables for selected quality. */

/* Some or all may be overridden if -qtables is present. */

if (qualityarg != NULL) /* process -quality if it was present */

if (! set_quality_ratings(cinfo, qualityarg, force_baseline))

usage();

if (qtablefile != NULL) /* process -qtables if it was present */

if (! read_quant_tables(cinfo, qtablefile, force_baseline))

usage();

if (qslotsarg != NULL) /* process -qslots if it was present */

if (! set_quant_slots(cinfo, qslotsarg))

usage();

if (samplearg != NULL) /* process -sample if it was present */

if (! set_sample_factors(cinfo, samplearg))

usage();

#ifdef C_PROGRESSIVE_SUPPORTED

if (simple_progressive) /* process -progressive; -scans can override */

jpeg_simple_progression(cinfo);

#endif

#ifdef C_MULTISCAN_FILES_SUPPORTED

if (scansarg != NULL) /* process -scans if it was present */

if (! read_scan_script(cinfo, scansarg))

usage();

#endif

}

return argn; /* return index of next arg (file name) */

}

/*

* The main program.

*/

int

main (int argc, char **argv)

{

struct jpeg_compress_struct cinfo;

struct jpeg_error_mgr jerr;

#ifdef PROGRESS_REPORT

struct cdjpeg_progress_mgr progress;

#endif

int file_index;

cjpeg_source_ptr src_mgr;

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

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

cinfo.err = jpeg_std_error(&jerr);

jpeg_create_compress(&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;

/* Now safe to enable signal catcher. */

#ifdef NEED_SIGNAL_CATCHER

enable_signal_catcher((j_common_ptr) &cinfo);

#endif

/* Initialize JPEG parameters.

* Much of this may be overridden later.

* In particular, we don't yet know the input file's color space,

* but we need to provide some value for jpeg_set_defaults() to work.

*/

cinfo.in_color_space = JCS_RGB; /* arbitrary guess */

jpeg_set_defaults(&cinfo);

/* 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.

*/

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

/* Figure out the input file format, and set up to read it. */

src_mgr = select_file_type(&cinfo, input_file);

src_mgr->input_file = input_file;

/* Read the input file header to obtain file size & colorspace. */

(*src_mgr->start_input) (&cinfo, src_mgr);

/* Now that we know input colorspace, fix colorspace-dependent defaults */

jpeg_default_colorspace(&cinfo);

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

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

/* Specify data destination for compression */

jpeg_stdio_dest(&cinfo, output_file);

/* Start compressor */

jpeg_start_compress(&cinfo, TRUE);

/* Process data */

while (cinfo.next_scanline < cinfo.image_height) {

num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);

(void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);

}

/* Finish compression and release memory */

(*src_mgr->finish_input) (&cinfo, src_mgr);

jpeg_finish_compress(&cinfo);

jpeg_destroy_compress(&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 */

}