/*
 * jpegtran.c
 *
 * This file was part of the Independent JPEG Group's software:
 * Copyright (C) 1995-2010, Thomas G. Lane, Guido Vollbeding.
 * libjpeg-turbo Modifications:
 * Copyright (C) 2010, 2014, D. R. Commander.
 * For conditions of distribution and use, see the accompanying README.ijg
 * 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 */
#include "jconfigint.h"

#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 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
#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, "  -version       Print version information and exit\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;
	copyoption = JCOPYOPT_DEFAULT;
	transformoption.transform = JXFORM_NONE;
	transformoption.perfect = FALSE;
	transformoption.trim = FALSE;
	transformoption.force_grayscale = FALSE;
	transformoption.crop = FALSE;
	transformoption.slow_hflip = 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, "%s version %s (build %s)\n",
				        PACKAGE_NAME, VERSION, BUILD);
				fprintf(stderr, "%s\n\n", JCOPYRIGHT);
				fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
				        JVERSION);
				printed_version = TRUE;
			}
			cinfo->err->trace_level++;

		} else if (keymatch(arg, "version", 4)) {
			fprintf(stderr, "%s version %s (build %s)\n",
			        PACKAGE_NAME, VERSION, BUILD);
			exit(EXIT_SUCCESS);

		} 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, "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);

	/* 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);

	/* 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 */
}
