Function DoExtension

win/share/gifread.c:102–165

}

static void
DoExtension(FILE *fd, int label)
{
    static char buf[256];
    const char *str;

    switch (label) {
    case 0x01: /* Plain Text Extension */
        str = "Plain Text Extension";
#ifdef notdef
        if (GetDataBlock(fd, (unsigned char *) buf) == 0)
            ;

        lpos = LM_to_uint(buf[0], buf[1]);
        tpos = LM_to_uint(buf[2], buf[3]);
        width = LM_to_uint(buf[4], buf[5]);
        height = LM_to_uint(buf[6], buf[7]);
        cellw = buf[8];
        cellh = buf[9];
        foreground = buf[10];
        background = buf[11];

        while (GetDataBlock(fd, (unsigned char *) buf) != 0) {
            PPM_ASSIGN(image[ypos][xpos], cmap[CM_RED][v], cmap[CM_GREEN][v],
                       cmap[CM_BLUE][v]);
            ++index;
        }

        return;
#else
        break;
#endif
    case 0xff: /* Application Extension */
        str = "Application Extension";
        break;
    case 0xfe: /* Comment Extension */
        str = "Comment Extension";
        while (GetDataBlock(fd, (unsigned char *) buf) != 0) {
            Fprintf(stderr, "gif comment: %s\n", buf);
        }
        return;
    case 0xf9: /* Graphic Control Extension */
        str = "Graphic Control Extension";
        (void) GetDataBlock(fd, (unsigned char *) buf);
        Gif89.disposal = (buf[0] >> 2) & 0x7;
        Gif89.inputFlag = (buf[0] >> 1) & 0x1;
        Gif89.delayTime = LM_to_uint(buf[1], buf[2]);
        if ((buf[0] & 0x1) != 0)
            Gif89.transparent = buf[3];

        while (GetDataBlock(fd, (unsigned char *) buf) != 0)
            ;
        return;
    default:
        str = buf;
        Sprintf(buf, "UNKNOWN (0x%02x)", label);
        break;
    }