/*

* jpegtran.c

*

* Copyright (C) 1995-2011, Thomas G. Lane, 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 JPEG transcoding.

* It is very similar to cjpeg.c, and partly to djpeg.c, but provides

* lossless transcoding between different JPEG file formats. It also

* provides some lossless and sort-of-lossless transformations of JPEG data.

*/

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

#include "transupp.h" /* Support routines for jpegtran */

#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

/*

* 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 */

static char * scaleoption; /* -scale switch */

static JCOPY_OPTION copyoption; /* -copy switch */

static jpeg_transform_info transformoption; /* image transformation options */

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, " -copy none Copy no extra markers from source file\n");

fprintf(stderr, " -copy comments Copy only comment markers (default)\n");

fprintf(stderr, " -copy all Copy all extra markers\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

fprintf(stderr, "Switches for modifying the image:\n");

#if TRANSFORMS_SUPPORTED

fprintf(stderr, " -crop WxH+X+Y Crop to a rectangular subarea\n");

fprintf(stderr, " -grayscale Reduce to grayscale (omit color data)\n");

fprintf(stderr, " -flip [horizontal|vertical] Mirror image (left-right or top-bottom)\n");

fprintf(stderr, " -perfect Fail if there is non-transformable edge blocks\n");

fprintf(stderr, " -rotate [90|180|270] Rotate image (degrees clockwise)\n");

#endif

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

#if TRANSFORMS_SUPPORTED

fprintf(stderr, " -transpose Transpose image\n");

fprintf(stderr, " -transverse Transverse transpose image\n");

fprintf(stderr, " -trim Drop non-transformable edge blocks\n");

#endif

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

#ifdef C_ARITH_CODING_SUPPORTED

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

#endif

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

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");

#ifdef C_MULTISCAN_FILES_SUPPORTED

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

#endif

exit(EXIT_FAILURE);

}

LOCAL(void)

select_transform (JXFORM_CODE transform)

/* Silly little routine to detect multiple transform options,

* which we can't handle.

*/

{

#if TRANSFORMS_SUPPORTED

if (transformoption.transform == JXFORM_NONE ||

transformoption.transform == transform) {

transformoption.transform = transform;

} else {

fprintf(stderr, "%s: can only do one image transformation at a time\n",

progname);

usage();

}

#else

fprintf(stderr, "%s: sorry, image transformation was not compiled\n",

progname);

exit(EXIT_FAILURE);

#endif

}

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 simple_progressive;

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

/* Set up default JPEG parameters. */

simple_progressive = FALSE;

outfilename = NULL;

scaleoption = NULL;

copyoption = JCOPYOPT_DEFAULT;

transformoption.transform = JXFORM_NONE;

transformoption.perfect = FALSE;

transformoption.trim = FALSE;

transformoption.force_grayscale = FALSE;

transformoption.crop = FALSE;

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, "copy", 2)) {

/* Select which extra markers to copy. */

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

usage();

if (keymatch(argv[argn], "none", 1)) {

copyoption = JCOPYOPT_NONE;

} else if (keymatch(argv[argn], "comments", 1)) {

copyoption = JCOPYOPT_COMMENTS;

} else if (keymatch(argv[argn], "all", 1)) {

copyoption = JCOPYOPT_ALL;

} else

usage();

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

/* Perform lossless cropping. */

#if TRANSFORMS_SUPPORTED

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

usage();

if (! jtransform_parse_crop_spec(&transformoption, argv[argn])) {

fprintf(stderr, "%s: bogus -crop argument '%s'\n",

progname, argv[argn]);

exit(EXIT_FAILURE);

}

#else

select_transform(JXFORM_NONE); /* force an error */

#endif

} 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 JPEGTRAN, version %s\n%s\n",

JVERSION, JCOPYRIGHT);

printed_version = TRUE;

}

cinfo->err->trace_level++;

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

/* Mirror left-right or top-bottom. */

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

usage();

if (keymatch(argv[argn], "horizontal", 1))

select_transform(JXFORM_FLIP_H);

else if (keymatch(argv[argn], "vertical", 1))

select_transform(JXFORM_FLIP_V);

else

usage();

} else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) {

/* Force to grayscale. */

#if TRANSFORMS_SUPPORTED

transformoption.force_grayscale = TRUE;

#else

select_transform(JXFORM_NONE); /* force an error */

#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, "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, "perfect", 2)) {

/* Fail if there is any partial edge MCUs that the transform can't

* handle. */

transformoption.perfect = TRUE;

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

/* 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, "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, "rotate", 2)) {

/* Rotate 90, 180, or 270 degrees (measured clockwise). */

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

usage();

if (keymatch(argv[argn], "90", 2))

select_transform(JXFORM_ROT_90);

else if (keymatch(argv[argn], "180", 3))

select_transform(JXFORM_ROT_180);

else if (keymatch(argv[argn], "270", 3))

select_transform(JXFORM_ROT_270);

else

usage();

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

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

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

usage();

scaleoption = argv[argn];

/* We must postpone processing until decompression startup. */

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

/* 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, "transpose", 1)) {

/* Transpose (across UL-to-LR axis). */

select_transform(JXFORM_TRANSPOSE);

} else if (keymatch(arg, "transverse", 6)) {

/* Transverse transpose (across UR-to-LL axis). */

select_transform(JXFORM_TRANSVERSE);

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

/* Trim off any partial edge MCUs that the transform can't handle. */

transformoption.trim = TRUE;

} else {

usage(); /* bogus switch */

}

}

/* Post-switch-scanning cleanup */

if (for_real) {

#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_decompress_struct srcinfo;

struct jpeg_compress_struct dstinfo;

struct jpeg_error_mgr jsrcerr, jdsterr;

#ifdef PROGRESS_REPORT

struct cdjpeg_progress_mgr progress;

#endif

jvirt_barray_ptr * src_coef_arrays;

jvirt_barray_ptr * dst_coef_arrays;

int file_index;

/* We assume all-in-memory processing and can therefore use only a

* single file pointer for sequential input and output operation.

*/

FILE * fp;

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

#ifdef USE_CCOMMAND

argc = ccommand(&argv);

#endif

progname = argv[0];

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

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

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

srcinfo.err = jpeg_std_error(&jsrcerr);

jpeg_create_decompress(&srcinfo);

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

dstinfo.err = jpeg_std_error(&jdsterr);

jpeg_create_compress(&dstinfo);

/* Now safe to enable signal catcher.

* Note: we assume only the decompression object will have virtual arrays.

*/

#ifdef NEED_SIGNAL_CATCHER

enable_signal_catcher((j_common_ptr) &srcinfo);

#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 mostly ignored; we will rescan the switches after

* opening the input file. Also note that most of the switches affect the

* destination JPEG object, so we parse into that and then copy over what

* needs to affects the source too.

*/

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

jsrcerr.trace_level = jdsterr.trace_level;

srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;

#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 ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) {

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

exit(EXIT_FAILURE);

}

} else {

/* default input file is stdin */

fp = read_stdin();

}

#ifdef PROGRESS_REPORT

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

#endif

/* Specify data source for decompression */

jpeg_stdio_src(&srcinfo, fp);

/* Enable saving of extra markers that we want to copy */

jcopy_markers_setup(&srcinfo, copyoption);

/* Read file header */

(void) jpeg_read_header(&srcinfo, TRUE);

/* Adjust default decompression parameters */

if (scaleoption != NULL)

if (sscanf(scaleoption, "%d/%d",

&srcinfo.scale_num, &srcinfo.scale_denom) < 1)

usage();

/* Any space needed by a transform option must be requested before

* jpeg_read_coefficients so that memory allocation will be done right.

*/

#if TRANSFORMS_SUPPORTED

/* Fail right away if -perfect is given and transformation is not perfect.

*/

if (!jtransform_request_workspace(&srcinfo, &transformoption)) {

fprintf(stderr, "%s: transformation is not perfect\n", progname);

exit(EXIT_FAILURE);

}

#endif

/* Read source file as DCT coefficients */

src_coef_arrays = jpeg_read_coefficients(&srcinfo);

/* Initialize destination compression parameters from source values */

jpeg_copy_critical_parameters(&srcinfo, &dstinfo);

/* Adjust destination parameters if required by transform options;

* also find out which set of coefficient arrays will hold the output.

*/

#if TRANSFORMS_SUPPORTED

dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,

src_coef_arrays,

&transformoption);

#else

dst_coef_arrays = src_coef_arrays;

#endif

/* Close input file, if we opened it.

* Note: we assume that jpeg_read_coefficients consumed all input

* until JPEG_REACHED_EOI, and that jpeg_finish_decompress will

* only consume more while (! cinfo->inputctl->eoi_reached).

* We cannot call jpeg_finish_decompress here since we still need the

* virtual arrays allocated from the source object for processing.

*/

if (fp != stdin)

fclose(fp);

/* Open the output file. */

if (outfilename != NULL) {

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

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

exit(EXIT_FAILURE);

}

} else {

/* default output file is stdout */

fp = write_stdout();

}

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

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

/* Specify data destination for compression */

jpeg_stdio_dest(&dstinfo, fp);

/* Start compressor (note no image data is actually written here) */

jpeg_write_coefficients(&dstinfo, dst_coef_arrays);

/* Copy to the output file any extra markers that we want to preserve */

jcopy_markers_execute(&srcinfo, &dstinfo, copyoption);

/* Execute image transformation, if any */

#if TRANSFORMS_SUPPORTED

jtransform_execute_transformation(&srcinfo, &dstinfo,

src_coef_arrays,

&transformoption);

#endif

/* Finish compression and release memory */

jpeg_finish_compress(&dstinfo);

jpeg_destroy_compress(&dstinfo);

(void) jpeg_finish_decompress(&srcinfo);

jpeg_destroy_decompress(&srcinfo);

/* Close output file, if we opened it */

if (fp != stdout)

fclose(fp);

#ifdef PROGRESS_REPORT

end_progress_monitor((j_common_ptr) &dstinfo);

#endif

/* All done. */

exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);

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

}