kc3-lang/libjpeg-turbo/rdswitch.c

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• Hash : 9fc018fd
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  Date : 2020-01-12T00:00:00
  

  The Independent JPEG Group's JPEG software v9d
  

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• rdswitch.c

• /*
   * rdswitch.c
   *
   * This file was part of the Independent JPEG Group's software:
   * Copyright (C) 1991-1996, Thomas G. Lane.
   * libjpeg-turbo Modifications:
   * Copyright (C) 2010, 2018, D. R. Commander.
   * For conditions of distribution and use, see the accompanying README.ijg
   * file.
   *
   * This file contains routines to process some of cjpeg's more complicated
   * command-line switches.  Switches processed here are:
   *      -qtables file           Read quantization tables from text file
   *      -scans file             Read scan script from text file
   *      -quality N[,N,...]      Set quality ratings
   *      -qslots N[,N,...]       Set component quantization table selectors
   *      -sample HxV[,HxV,...]   Set component sampling factors
   */
  
  #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
  #include <ctype.h>              /* to declare isdigit(), isspace() */
  
  
  LOCAL(int)
  text_getc(FILE *file)
  /* Read next char, skipping over any comments (# to end of line) */
  /* A comment/newline sequence is returned as a newline */
  {
    register int ch;
  
    ch = getc(file);
    if (ch == '#') {
      do {
        ch = getc(file);
      } while (ch != '\n' && ch != EOF);
    }
    return ch;
  }
  
  
  LOCAL(boolean)
  read_text_integer(FILE *file, long *result, int *termchar)
  /* Read an unsigned decimal integer from a file, store it in result */
  /* Reads one trailing character after the integer; returns it in termchar */
  {
    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;
  }
  
  
  #if JPEG_LIB_VERSION < 70
  static int q_scale_factor[NUM_QUANT_TBLS] = { 100, 100, 100, 100 };
  #endif
  
  GLOBAL(boolean)
  read_quant_tables(j_compress_ptr cinfo, char *filename, boolean force_baseline)
  /* Read a set of quantization tables from the specified file.
   * The file is plain ASCII text: decimal numbers with whitespace between.
   * Comments preceded by '#' may be included in the file.
   * There may be one to NUM_QUANT_TBLS tables in the file, each of 64 values.
   * The tables are implicitly numbered 0,1,etc.
   * NOTE: does not affect the qslots mapping, which will default to selecting
   * table 0 for luminance (or primary) components, 1 for chrominance components.
   * You must use -qslots if you want a different component->table mapping.
   */
  {
    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;
      }
  #if JPEG_LIB_VERSION >= 70
      jpeg_add_quant_table(cinfo, tblno, table, cinfo->q_scale_factor[tblno],
                           force_baseline);
  #else
      jpeg_add_quant_table(cinfo, tblno, table, q_scale_factor[tblno],
                           force_baseline);
  #endif
      tblno++;
    }
  
    if (termchar != EOF) {
      fprintf(stderr, "Non-numeric data in file %s\n", filename);
      fclose(fp);
      return FALSE;
    }
  
    fclose(fp);
    return TRUE;
  }
  
  
  #ifdef C_MULTISCAN_FILES_SUPPORTED
  
  LOCAL(boolean)
  read_scan_integer(FILE *file, long *result, int *termchar)
  /* Variant of read_text_integer that always looks for a non-space termchar;
   * this simplifies parsing of punctuation in scan scripts.
   */
  {
    register int ch;
  
    if (!read_text_integer(file, result, termchar))
      return FALSE;
    ch = *termchar;
    while (ch != EOF && isspace(ch))
      ch = text_getc(file);
    if (isdigit(ch)) {            /* oops, put it back */
      if (ungetc(ch, file) == EOF)
        return FALSE;
      ch = ' ';
    } else {
      /* Any separators other than ';' and ':' are ignored;
       * this allows user to insert commas, etc, if desired.
       */
      if (ch != EOF && ch != ';' && ch != ':')
        ch = ' ';
    }
    *termchar = ch;
    return TRUE;
  }
  
  
  GLOBAL(boolean)
  read_scan_script(j_compress_ptr cinfo, char *filename)
  /* Read a scan script from the specified text file.
   * Each entry in the file defines one scan to be emitted.
   * Entries are separated by semicolons ';'.
   * An entry contains one to four component indexes,
   * optionally followed by a colon ':' and four progressive-JPEG parameters.
   * The component indexes denote which component(s) are to be transmitted
   * in the current scan.  The first component has index 0.
   * Sequential JPEG is used if the progressive-JPEG parameters are omitted.
   * The file is free format text: any whitespace may appear between numbers
   * and the ':' and ';' punctuation marks.  Also, other punctuation (such
   * as commas or dashes) can be placed between numbers if desired.
   * Comments preceded by '#' may be included in the file.
   * Note: we do very little validity checking here;
   * jcmaster.c will validate the script parameters.
   */
  {
    FILE *fp;
    int scanno, ncomps, termchar;
    long val;
    jpeg_scan_info *scanptr;
  #define MAX_SCANS  100          /* quite arbitrary limit */
    jpeg_scan_info scans[MAX_SCANS];
  
    if ((fp = fopen(filename, "r")) == NULL) {
      fprintf(stderr, "Can't open scan definition file %s\n", filename);
      return FALSE;
    }
    scanptr = scans;
    scanno = 0;
  
    while (read_scan_integer(fp, &val, &termchar)) {
      if (scanno >= MAX_SCANS) {
        fprintf(stderr, "Too many scans defined in file %s\n", filename);
        fclose(fp);
        return FALSE;
      }
      scanptr->component_index[0] = (int)val;
      ncomps = 1;
      while (termchar == ' ') {
        if (ncomps >= MAX_COMPS_IN_SCAN) {
          fprintf(stderr, "Too many components in one scan in file %s\n",
                  filename);
          fclose(fp);
          return FALSE;
        }
        if (!read_scan_integer(fp, &val, &termchar))
          goto bogus;
        scanptr->component_index[ncomps] = (int)val;
        ncomps++;
      }
      scanptr->comps_in_scan = ncomps;
      if (termchar == ':') {
        if (!read_scan_integer(fp, &val, &termchar) || termchar != ' ')
          goto bogus;
        scanptr->Ss = (int)val;
        if (!read_scan_integer(fp, &val, &termchar) || termchar != ' ')
          goto bogus;
        scanptr->Se = (int)val;
        if (!read_scan_integer(fp, &val, &termchar) || termchar != ' ')
          goto bogus;
        scanptr->Ah = (int)val;
        if (!read_scan_integer(fp, &val, &termchar))
          goto bogus;
        scanptr->Al = (int)val;
      } else {
        /* set non-progressive parameters */
        scanptr->Ss = 0;
        scanptr->Se = DCTSIZE2 - 1;
        scanptr->Ah = 0;
        scanptr->Al = 0;
      }
      if (termchar != ';' && termchar != EOF) {
  bogus:
        fprintf(stderr, "Invalid scan entry format in file %s\n", filename);
        fclose(fp);
        return FALSE;
      }
      scanptr++, scanno++;
    }
  
    if (termchar != EOF) {
      fprintf(stderr, "Non-numeric data in file %s\n", filename);
      fclose(fp);
      return FALSE;
    }
  
    if (scanno > 0) {
      /* Stash completed scan list in cinfo structure.
       * NOTE: for cjpeg's use, JPOOL_IMAGE is the right lifetime for this data,
       * but if you want to compress multiple images you'd want JPOOL_PERMANENT.
       */
      scanptr = (jpeg_scan_info *)
        (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
                                    scanno * sizeof(jpeg_scan_info));
      MEMCOPY(scanptr, scans, scanno * sizeof(jpeg_scan_info));
      cinfo->scan_info = scanptr;
      cinfo->num_scans = scanno;
    }
  
    fclose(fp);
    return TRUE;
  }
  
  #endif /* C_MULTISCAN_FILES_SUPPORTED */
  
  
  #if JPEG_LIB_VERSION < 70
  /* These are the sample quantization tables given in Annex K (Clause K.1) of
   * Recommendation ITU-T T.81 (1992) | ISO/IEC 10918-1:1994.
   * The spec says that the values given produce "good" quality, and
   * when divided by 2, "very good" quality.
   */
  static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {
    16,  11,  10,  16,  24,  40,  51,  61,
    12,  12,  14,  19,  26,  58,  60,  55,
    14,  13,  16,  24,  40,  57,  69,  56,
    14,  17,  22,  29,  51,  87,  80,  62,
    18,  22,  37,  56,  68, 109, 103,  77,
    24,  35,  55,  64,  81, 104, 113,  92,
    49,  64,  78,  87, 103, 121, 120, 101,
    72,  92,  95,  98, 112, 100, 103,  99
  };
  static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
    17,  18,  24,  47,  99,  99,  99,  99,
    18,  21,  26,  66,  99,  99,  99,  99,
    24,  26,  56,  99,  99,  99,  99,  99,
    47,  66,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99
  };
  
  
  LOCAL(void)
  jpeg_default_qtables(j_compress_ptr cinfo, boolean force_baseline)
  {
    jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl, q_scale_factor[0],
                         force_baseline);
    jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, q_scale_factor[1],
                         force_baseline);
  }
  #endif
  
  
  GLOBAL(boolean)
  set_quality_ratings(j_compress_ptr cinfo, char *arg, boolean force_baseline)
  /* Process a quality-ratings parameter string, of the form
   *     N[,N,...]
   * If there are more q-table slots than parameters, the last value is replicated.
   */
  {
    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 */
  #if JPEG_LIB_VERSION >= 70
        cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
  #else
        q_scale_factor[tblno] = jpeg_quality_scaling(val);
  #endif
        while (*arg && *arg++ != ','); /* advance to next segment of arg
                                          string */
      } else {
        /* reached end of parameter, set remaining factors to last value */
  #if JPEG_LIB_VERSION >= 70
        cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
  #else
        q_scale_factor[tblno] = jpeg_quality_scaling(val);
  #endif
      }
    }
    jpeg_default_qtables(cinfo, force_baseline);
    return TRUE;
  }
  
  
  GLOBAL(boolean)
  set_quant_slots(j_compress_ptr cinfo, char *arg)
  /* Process a quantization-table-selectors parameter string, of the form
   *     N[,N,...]
   * If there are more components than parameters, the last value is replicated.
   */
  {
    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;
  }
  
  
  GLOBAL(boolean)
  set_sample_factors(j_compress_ptr cinfo, char *arg)
  /* Process a sample-factors parameter string, of the form
   *     HxV[,HxV,...]
   * If there are more components than parameters, "1x1" is assumed for the rest.
   */
  {
    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 > 4 || val2 <= 0 || val2 > 4) {
          fprintf(stderr, "JPEG sampling factors must be 1..4\n");
          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;
  }
  

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