/*
 * cjpeg.c
 *
 * This file was part of the Independent JPEG Group's software:
 * Copyright (C) 1991-1998, Thomas G. Lane.
 * Modified 2003-2011 by Guido Vollbeding.
 * libjpeg-turbo Modifications:
 * Copyright (C) 2010, 2013-2014, D. R. Commander.
 * For conditions of distribution and use, see the accompanying README.ijg
 * file.
 *
 * This file contains a command-line user interface for 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 */
#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


/* 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 */
boolean memdst;                 /* for -memdst 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 most useful range,\n");
	fprintf(stderr, "                     default is 75)\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 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_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, "  -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");
#if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
	fprintf(stderr, "  -memdst        Compress to memory instead of file (useful for benchmarking)\n");
#endif
	fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
	fprintf(stderr, "  -version       Print version information and exit\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;
	memdst = 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, "baseline", 1)) {
			/* Force baseline-compatible output (8-bit quantizer values). */
			force_baseline = TRUE;

		} 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, "%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, "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, "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 in\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 in\n",
					progname);
			exit(EXIT_FAILURE);
#endif

		} else if (keymatch(arg, "memdst", 2)) {
			/* Use in-memory destination manager */
#if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
			memdst = TRUE;
#else
			fprintf(stderr, "%s: sorry, in-memory destination manager was not compiled in\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, "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 in\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 = NULL;
	unsigned char *outbuffer = NULL;
	unsigned long outsize = 0;
	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;

	/* 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
	if (!memdst) {
	  /* 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 if (!memdst) {
		/* 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 */
#if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
	if (memdst)
	  jpeg_mem_dest(&cinfo, &outbuffer, &outsize);
	else
#endif
	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 && output_file != NULL)
		fclose(output_file);

#ifdef PROGRESS_REPORT
	end_progress_monitor((j_common_ptr) &cinfo);
#endif

	if (memdst) {
		fprintf(stderr, "Compressed size:  %lu bytes\n", outsize);
		if (outbuffer != NULL)
			free(outbuffer);
	}

	/* All done. */
	exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
	return 0;                     /* suppress no-return-value warnings */
}
