Function read_data_block

win/share/giftiles.c:456–491

}

static boolean
read_data_block(struct Bitstream *gif, struct DataBlock *block)
{
    long pos = ftell(gif->fp);
    int b;
    size_t i;

    free_data_block(block);

    /* Get the length of the data block */
    while (TRUE) {
        b = fgetc(gif->fp);
        if (b == EOF) return FALSE;
        if (b == 0) break;
        block->size += b;
        fseek(gif->fp, b, SEEK_CUR);
    }
    fseek(gif->fp, pos, SEEK_SET);

    /* Allocate memory */
    block->data = (unsigned char *) alloc(block->size);

    /* Read the data from the file */
    i = 0;
    while (TRUE) {
        b = fgetc(gif->fp);
        if (b == EOF) return FALSE;
        if (b == 0) break;
        if (fread(block->data + i, 1, b, gif->fp) != (unsigned) b)
            return FALSE;
        i += b;
    }

    block->index = 0;
    return TRUE;
}

static void
free_data_block(struct DataBlock *block)