00047 {
00048   JSAMPROW colormap0 = cinfo->colormap[0];
00049   JSAMPROW colormap1 = cinfo->colormap[1];
00050   JSAMPROW colormap2 = cinfo->colormap[2];
00051   int ncolors = cinfo->actual_number_of_colors;
00052   int index;
00053 
00054   /* Check for duplicate color. */
00055   for (index = 0; index < ncolors; index++) {
00056     if (GETJSAMPLE(colormap0[index]) == R &&
00057         GETJSAMPLE(colormap1[index]) == G &&
00058         GETJSAMPLE(colormap2[index]) == B)
00059       return;                   /* color is already in map */
00060   }
00061 
00062   /* Check for map overflow. */
00063   if (ncolors >= (MAXJSAMPLE+1))
00064     ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, (MAXJSAMPLE+1));
00065 
00066   /* OK, add color to map. */
00067   colormap0[ncolors] = (JSAMPLE) R;
00068   colormap1[ncolors] = (JSAMPLE) G;
00069   colormap2[ncolors] = (JSAMPLE) B;
00070   cinfo->actual_number_of_colors++;
00071 }

00124 {
00125   register int ch;
00126   
00127   ch = getc(infile);
00128   if (ch == '#') {
00129     do {
00130       ch = getc(infile);
00131     } while (ch != '\n' && ch != EOF);
00132   }
00133   return ch;
00134 }

00232 {
00233   /* Allocate space for a color map of maximum supported size. */
00234   cinfo->colormap = (*cinfo->mem->alloc_sarray)
00235     ((j_common_ptr) cinfo, JPOOL_IMAGE,
00236      (JDIMENSION) (MAXJSAMPLE+1), (JDIMENSION) 3);
00237   cinfo->actual_number_of_colors = 0; /* initialize map to empty */
00238 
00239   /* Read first byte to determine file format */
00240   switch (getc(infile)) {
00241   case 'G':
00242     read_gif_map(cinfo, infile);
00243     break;
00244   case 'P':
00245     read_ppm_map(cinfo, infile);
00246     break;
00247   default:
00248     ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00249     break;
00250   }
00251 }

00080 {
00081   int header[13];
00082   int i, colormaplen;
00083   int R, G, B;
00084 
00085   /* Initial 'G' has already been read by read_color_map */
00086   /* Read the rest of the GIF header and logical screen descriptor */
00087   for (i = 1; i < 13; i++) {
00088     if ((header[i] = getc(infile)) == EOF)
00089       ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00090   }
00091 
00092   /* Verify GIF Header */
00093   if (header[1] != 'I' || header[2] != 'F')
00094     ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00095 
00096   /* There must be a global color map. */
00097   if ((header[10] & 0x80) == 0)
00098     ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00099 
00100   /* OK, fetch it. */
00101   colormaplen = 2 << (header[10] & 0x07);
00102 
00103   for (i = 0; i < colormaplen; i++) {
00104     R = getc(infile);
00105     G = getc(infile);
00106     B = getc(infile);
00107     if (R == EOF || G == EOF || B == EOF)
00108       ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00109     add_map_entry(cinfo,
00110                   R << (BITS_IN_JSAMPLE-8),
00111                   G << (BITS_IN_JSAMPLE-8),
00112                   B << (BITS_IN_JSAMPLE-8));
00113   }
00114 }

00143 {
00144   register int ch;
00145   register unsigned int val;
00146   
00147   /* Skip any leading whitespace */
00148   do {
00149     ch = pbm_getc(infile);
00150     if (ch == EOF)
00151       ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00152   } while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r');
00153   
00154   if (ch < '0' || ch > '9')
00155     ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00156   
00157   val = ch - '0';
00158   while ((ch = pbm_getc(infile)) >= '0' && ch <= '9') {
00159     val *= 10;
00160     val += ch - '0';
00161   }
00162   return val;
00163 }

00172 {
00173   int c;
00174   unsigned int w, h, maxval, row, col;
00175   int R, G, B;
00176 
00177   /* Initial 'P' has already been read by read_color_map */
00178   c = getc(infile);             /* save format discriminator for a sec */
00179 
00180   /* while we fetch the remaining header info */
00181   w = read_pbm_integer(cinfo, infile);
00182   h = read_pbm_integer(cinfo, infile);
00183   maxval = read_pbm_integer(cinfo, infile);
00184 
00185   if (w <= 0 || h <= 0 || maxval <= 0) /* error check */
00186     ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00187 
00188   /* For now, we don't support rescaling from an unusual maxval. */
00189   if (maxval != (unsigned int) MAXJSAMPLE)
00190     ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00191 
00192   switch (c) {
00193   case '3':                     /* it's a text-format PPM file */
00194     for (row = 0; row < h; row++) {
00195       for (col = 0; col < w; col++) {
00196         R = read_pbm_integer(cinfo, infile);
00197         G = read_pbm_integer(cinfo, infile);
00198         B = read_pbm_integer(cinfo, infile);
00199         add_map_entry(cinfo, R, G, B);
00200       }
00201     }
00202     break;
00203 
00204   case '6':                     /* it's a raw-format PPM file */
00205     for (row = 0; row < h; row++) {
00206       for (col = 0; col < w; col++) {
00207         R = getc(infile);
00208         G = getc(infile);
00209         B = getc(infile);
00210         if (R == EOF || G == EOF || B == EOF)
00211           ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00212         add_map_entry(cinfo, R, G, B);
00213       }
00214     }
00215     break;
00216 
00217   default:
00218     ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00219     break;
00220   }
00221 }