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- #include "cdjpeg.h"
- #ifdef QUANT_2PASS_SUPPORTED
- LOCAL(void)
- add_map_entry(j_decompress_ptr cinfo, int R, int G, int B)
- {
- JSAMPROW colormap0 = cinfo->colormap[0];
- JSAMPROW colormap1 = cinfo->colormap[1];
- JSAMPROW colormap2 = cinfo->colormap[2];
- int ncolors = cinfo->actual_number_of_colors;
- int index;
-
- for (index = 0; index < ncolors; index++) {
- if (GETJSAMPLE(colormap0[index]) == R &&
- GETJSAMPLE(colormap1[index]) == G &&
- GETJSAMPLE(colormap2[index]) == B)
- return;
- }
-
- if (ncolors >= (MAXJSAMPLE + 1))
- ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, (MAXJSAMPLE + 1));
-
- colormap0[ncolors] = (JSAMPLE)R;
- colormap1[ncolors] = (JSAMPLE)G;
- colormap2[ncolors] = (JSAMPLE)B;
- cinfo->actual_number_of_colors++;
- }
- LOCAL(void)
- read_gif_map(j_decompress_ptr cinfo, FILE *infile)
- {
- int header[13];
- int i, colormaplen;
- int R, G, B;
-
-
- for (i = 1; i < 13; i++) {
- if ((header[i] = getc(infile)) == EOF)
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
- }
-
- if (header[1] != 'I' || header[2] != 'F')
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
-
- if ((header[10] & 0x80) == 0)
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
-
- colormaplen = 2 << (header[10] & 0x07);
- for (i = 0; i < colormaplen; i++) {
- R = getc(infile);
- G = getc(infile);
- B = getc(infile);
- if (R == EOF || G == EOF || B == EOF)
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
- add_map_entry(cinfo,
- R << (BITS_IN_JSAMPLE - 8),
- G << (BITS_IN_JSAMPLE - 8),
- B << (BITS_IN_JSAMPLE - 8));
- }
- }
- LOCAL(int)
- pbm_getc(FILE *infile)
- {
- register int ch;
- ch = getc(infile);
- if (ch == '#') {
- do {
- ch = getc(infile);
- } while (ch != '\n' && ch != EOF);
- }
- return ch;
- }
- LOCAL(unsigned int)
- read_pbm_integer(j_decompress_ptr cinfo, FILE *infile)
- {
- register int ch;
- register unsigned int val;
-
- do {
- ch = pbm_getc(infile);
- if (ch == EOF)
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
- } while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r');
- if (ch < '0' || ch > '9')
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
- val = ch - '0';
- while ((ch = pbm_getc(infile)) >= '0' && ch <= '9') {
- val *= 10;
- val += ch - '0';
- }
- return val;
- }
- LOCAL(void)
- read_ppm_map(j_decompress_ptr cinfo, FILE *infile)
- {
- int c;
- unsigned int w, h, maxval, row, col;
- int R, G, B;
-
- c = getc(infile);
-
- w = read_pbm_integer(cinfo, infile);
- h = read_pbm_integer(cinfo, infile);
- maxval = read_pbm_integer(cinfo, infile);
- if (w <= 0 || h <= 0 || maxval <= 0)
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
-
- if (maxval != (unsigned int)MAXJSAMPLE)
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
- switch (c) {
- case '3':
- for (row = 0; row < h; row++) {
- for (col = 0; col < w; col++) {
- R = read_pbm_integer(cinfo, infile);
- G = read_pbm_integer(cinfo, infile);
- B = read_pbm_integer(cinfo, infile);
- add_map_entry(cinfo, R, G, B);
- }
- }
- break;
- case '6':
- for (row = 0; row < h; row++) {
- for (col = 0; col < w; col++) {
- R = getc(infile);
- G = getc(infile);
- B = getc(infile);
- if (R == EOF || G == EOF || B == EOF)
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
- add_map_entry(cinfo, R, G, B);
- }
- }
- break;
- default:
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
- break;
- }
- }
- GLOBAL(void)
- read_color_map(j_decompress_ptr cinfo, FILE *infile)
- {
-
- cinfo->colormap = (*cinfo->mem->alloc_sarray)
- ((j_common_ptr)cinfo, JPOOL_IMAGE,
- (JDIMENSION)(MAXJSAMPLE + 1), (JDIMENSION)3);
- cinfo->actual_number_of_colors = 0;
-
- switch (getc(infile)) {
- case 'G':
- read_gif_map(cinfo, infile);
- break;
- case 'P':
- read_ppm_map(cinfo, infile);
- break;
- default:
- ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
- break;
- }
- }
- #endif
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