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plt-scheme  4.2.1
Functions | Variables
jpegtran.c File Reference
#include "cdjpeg.h"
#include "transupp.h"
#include "jversion.h"

Go to the source code of this file.

Functions

 usage (void)
 select_transform (JXFORM_CODE transform)
 parse_switches (j_compress_ptr cinfo, int argc, char **argv, int last_file_arg_seen, boolean for_real)
int main (int argc, char **argv)

Variables

static const char * progname
static char * outfilename
static JCOPY_OPTION copyoption
static jpeg_transform_info transformoption

Function Documentation

int main ( int  argc,
char **  argv 
)

Definition at line 334 of file jpegtran.c.

{
  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 */
}

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parse_switches ( j_compress_ptr  cinfo,
int  argc,
char **  argv,
int  last_file_arg_seen,
boolean  for_real 
)

Definition at line 114 of file jpegtran.c.

{
  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) */
}

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select_transform ( JXFORM_CODE  transform)

Definition at line 91 of file jpegtran.c.

{
#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
}

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usage ( void  )

Definition at line 45 of file jpegtran.c.

{
  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);
}

Variable Documentation

Definition at line 40 of file jpegtran.c.

char* outfilename [static]

Definition at line 39 of file jpegtran.c.

const char* progname [static]

Definition at line 38 of file jpegtran.c.

Definition at line 41 of file jpegtran.c.