rdswitch.c File Reference

#include "cdjpeg.h"
#include <ctype.h>

Include dependency graph for rdswitch.c:

Go to the source code of this file.

Functions
	text_getc (FILE *file)
	read_text_integer (FILE *file, long *result, int *termchar)
	read_quant_tables (j_compress_ptr cinfo, char *filename, boolean force_baseline)
	set_quality_ratings (j_compress_ptr cinfo, char *arg, boolean force_baseline)
	set_quant_slots (j_compress_ptr cinfo, char *arg)
	set_sample_factors (j_compress_ptr cinfo, char *arg)

Function Documentation

read_quant_tables()

read_quant_tables	(	j_compress_ptr	cinfo,
		char *	filename,
		boolean	force_baseline
	)

Definition at line 75 of file rdswitch.c.

{
  FILE * fp;
  int tblno, i, termchar;
  long val;
  unsigned int table[DCTSIZE2];

  if ((fp = fopen(filename, "r")) == NULL) {
    fprintf(stderr, "Can't open table file %s\n", filename);
    return FALSE;
  }
  tblno = 0;

  while (read_text_integer(fp, &val, &termchar)) { /* read 1st element of table */
    if (tblno >= NUM_QUANT_TBLS) {
      fprintf(stderr, "Too many tables in file %s\n", filename);
      fclose(fp);
      return FALSE;
    }
    table[0] = (unsigned int) val;
    for (i = 1; i < DCTSIZE2; i++) {
      if (! read_text_integer(fp, &val, &termchar)) {
    fprintf(stderr, "Invalid table data in file %s\n", filename);
    fclose(fp);
    return FALSE;
      }
      table[i] = (unsigned int) val;
    }
    jpeg_add_quant_table(cinfo, tblno, table, cinfo->q_scale_factor[tblno],
             force_baseline);
    tblno++;
  }

  if (termchar != EOF) {
    fprintf(stderr, "Non-numeric data in file %s\n", filename);
    fclose(fp);
    return FALSE;
  }

  fclose(fp);
  return TRUE;
}

Referenced by parse_switches().

read_text_integer()

read_text_integer	(	FILE *	file,
		long *	result,
		int *	termchar
	)

Definition at line 40 of file rdswitch.c.

{
  register int ch;
  register long val;
  
  /* Skip any leading whitespace, detect EOF */
  do {
    ch = text_getc(file);
    if (ch == EOF) {
      *termchar = ch;
      return FALSE;
    }
  } while (isspace(ch));
  
  if (! isdigit(ch)) {
    *termchar = ch;
    return FALSE;
  }

  val = ch - '0';
  while ((ch = text_getc(file)) != EOF) {
    if (! isdigit(ch))
      break;
    val *= 10;
    val += ch - '0';
  }
  *result = val;
  *termchar = ch;
  return TRUE;
}

Referenced by read_quant_tables().

set_quality_ratings()

set_quality_ratings	(	j_compress_ptr	cinfo,
		char *	arg,
		boolean	force_baseline
	)

Definition at line 268 of file rdswitch.c.

{
  int val = 75;         /* default value */
  int tblno;
  char ch;

  for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
    if (*arg) {
      ch = ',';         /* if not set by sscanf, will be ',' */
      if (sscanf(arg, "%d%c", &val, &ch) < 1)
    return FALSE;
      if (ch != ',')        /* syntax check */
    return FALSE;
      /* Convert user 0-100 rating to percentage scaling */
      cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
      while (*arg && *arg++ != ',') /* advance to next segment of arg string */
    ;
    } else {
      /* reached end of parameter, set remaining factors to last value */
      cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
    }
  }
  jpeg_default_qtables(cinfo, force_baseline);
  return TRUE;
}

Referenced by parse_switches().

set_quant_slots()

set_quant_slots	(	j_compress_ptr	cinfo,
		char *	arg
	)

Definition at line 300 of file rdswitch.c.

{
  int val = 0;          /* default table # */
  int ci;
  char ch;

  for (ci = 0; ci < MAX_COMPONENTS; ci++) {
    if (*arg) {
      ch = ',';         /* if not set by sscanf, will be ',' */
      if (sscanf(arg, "%d%c", &val, &ch) < 1)
    return FALSE;
      if (ch != ',')        /* syntax check */
    return FALSE;
      if (val < 0 || val >= NUM_QUANT_TBLS) {
    fprintf(stderr, "JPEG quantization tables are numbered 0..%d\n",
        NUM_QUANT_TBLS-1);
    return FALSE;
      }
      cinfo->comp_info[ci].quant_tbl_no = val;
      while (*arg && *arg++ != ',') /* advance to next segment of arg string */
    ;
    } else {
      /* reached end of parameter, set remaining components to last table */
      cinfo->comp_info[ci].quant_tbl_no = val;
    }
  }
  return TRUE;
}

Referenced by parse_switches().

set_sample_factors()

set_sample_factors	(	j_compress_ptr	cinfo,
		char *	arg
	)

Definition at line 335 of file rdswitch.c.

{
  int ci, val1, val2;
  char ch1, ch2;

  for (ci = 0; ci < MAX_COMPONENTS; ci++) {
    if (*arg) {
      ch2 = ',';        /* if not set by sscanf, will be ',' */
      if (sscanf(arg, "%d%c%d%c", &val1, &ch1, &val2, &ch2) < 3)
    return FALSE;
      if ((ch1 != 'x' && ch1 != 'X') || ch2 != ',') /* syntax check */
    return FALSE;
      if (val1 <= 0 || val1 > MAX_SAMP_FACTOR ||
      val2 <= 0 || val2 > MAX_SAMP_FACTOR) {
    fprintf(stderr, "JPEG sampling factors must be 1..%d\n", MAX_SAMP_FACTOR);
    return FALSE;
      }
      cinfo->comp_info[ci].h_samp_factor = val1;
      cinfo->comp_info[ci].v_samp_factor = val2;
      while (*arg && *arg++ != ',') /* advance to next segment of arg string */
    ;
    } else {
      /* reached end of parameter, set remaining components to 1x1 sampling */
      cinfo->comp_info[ci].h_samp_factor = 1;
      cinfo->comp_info[ci].v_samp_factor = 1;
    }
  }
  return TRUE;
}

Referenced by parse_switches().

text_getc()

text_getc

(

FILE *

file

)

Definition at line 23 of file rdswitch.c.

{
  register int ch;
  
  ch = getc(file);
  if (ch == '#') {
    do {
      ch = getc(file);
    } while (ch != '\n' && ch != EOF);
  }
  return ch;
}

Referenced by read_text_integer().