www.pudn.com > imgport.rar > jpegtran.c, change:2008-11-05,size:16731b


/* 
 * jpegtran.c 
 * 
 * Copyright (C) 1995-1997, Thomas G. Lane. 
 * 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, 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 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 
#if TRANSFORMS_SUPPORTED 
  fprintf(stderr, "Switches for modifying the image:\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, "  -rotate [90|180|270]         Rotate image (degrees clockwise)\n"); 
  fprintf(stderr, "  -transpose     Transpose image\n"); 
  fprintf(stderr, "  -transverse    Transverse transpose image\n"); 
  fprintf(stderr, "  -trim          Drop non-transformable edge blocks\n"); 
#endif /* TRANSFORMS_SUPPORTED */ 
  fprintf(stderr, "Switches for advanced users:\n"); 
  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_ARITH_CODING_SUPPORTED 
  fprintf(stderr, "  -arithmetic    Use arithmetic coding\n"); 
#endif 
#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.trim = FALSE; 
  transformoption.force_grayscale = 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", 1)) { 
      /* 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, "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, "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, "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; 
  FILE * input_file; 
  FILE * output_file; 
 
  /* 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 ((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) &dstinfo, &progress); 
#endif 
 
  /* Specify data source for decompression */ 
  jpeg_stdio_src(&srcinfo, input_file); 
 
  /* 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 
  jtransform_request_workspace(&srcinfo, &transformoption); 
#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 
 
  /* 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, output_file); 
 
  /* 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 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) &dstinfo); 
#endif 
 
  /* All done. */ 
  exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS); 
  return 0;			/* suppress no-return-value warnings */ 
}