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plt-scheme  4.2.1
Defines | Functions | Variables
cjpeg.c File Reference
#include "cdjpeg.h"
#include "jversion.h"
#include "cderror.h"

Go to the source code of this file.

Defines

#define JMESSAGE(code, string)   string ,

Functions

 select_file_type (j_compress_ptr cinfo, FILE *infile)
 usage (void)
 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 *const cdjpeg_message_table []
static boolean is_targa
static const char * progname
static char * outfilename

Define Documentation

#define JMESSAGE (   code,
  string 
)    string ,

Definition at line 42 of file cjpeg.c.


Function Documentation

int main ( int  argc,
char **  argv 
)

Definition at line 461 of file cjpeg.c.

{
  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;
  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;

  /* Now safe to enable signal catcher. */
#ifdef NEED_SIGNAL_CATCHER
  enable_signal_catcher((j_common_ptr) &cinfo);
#endif

  /* 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
  /* 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) &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 */
  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)
    fclose(output_file);

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

  /* All done. */
  exit(jerr.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 199 of file cjpeg.c.

{
  int argn;
  char * arg;
  int quality;                     /* -quality parameter */
  int q_scale_factor;              /* scaling percentage for -qtables */
  boolean force_baseline;
  boolean simple_progressive;
  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. */
  /* Note that default -quality level need not, and does not,
   * match the default scaling for an explicit -qtables argument.
   */
  quality = 75;                    /* default -quality value */
  q_scale_factor = 100;            /* default to no scaling for -qtables */
  force_baseline = FALSE;   /* by default, allow 16-bit quantizers */
  simple_progressive = FALSE;
  is_targa = FALSE;
  outfilename = NULL;
  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, "Independent JPEG Group's CJPEG, version %s\n%s\n",
              JVERSION, JCOPYRIGHT);
       printed_version = TRUE;
      }
      cinfo->err->trace_level++;

    } 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, "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, "quality", 1)) {
      /* Quality factor (quantization table scaling factor). */
      if (++argn >= argc)   /* advance to next argument */
       usage();
      if (sscanf(argv[argn], "%d", &quality) != 1)
       usage();
      /* Change scale factor in case -qtables is present. */
      q_scale_factor = jpeg_quality_scaling(quality);

    } 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", 2)) {
      /* 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, "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. */
    jpeg_set_quality(cinfo, quality, force_baseline);

    if (qtablefile != NULL) /* process -qtables if it was present */
      if (! read_quant_tables(cinfo, qtablefile,
                           q_scale_factor, 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) */
}

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select_file_type ( j_compress_ptr  cinfo,
FILE *  infile 
)

Definition at line 80 of file cjpeg.c.

{
  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 */
}

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usage ( void  )

Definition at line 141 of file cjpeg.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, "  -quality N     Compression quality (0..100; 5-95 is useful range)\n");
  fprintf(stderr, "  -grayscale     Create monochrome 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 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");
  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
  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);
}

Variable Documentation

const char* const cdjpeg_message_table[] [static]

Definition at line 44 of file cjpeg.c.

boolean is_targa [static]

Definition at line 76 of file cjpeg.c.

char* outfilename [static]

Definition at line 137 of file cjpeg.c.

const char* progname [static]

Definition at line 136 of file cjpeg.c.