Function fopen_gif_file

win/share/gifread.c:515–579

}

boolean
fopen_gif_file(const char *filename, const char *type)
{
    int i;

    if (strcmp(type, RDBMODE)) {
        Fprintf(stderr, "using reading routine for non-reading?\n");
        return FALSE;
    }
    gif_file = fopen(filename, type);
    if (gif_file == (FILE *) 0) {
        Fprintf(stderr, "cannot open gif file %s\n", filename);
        return FALSE;
    }

    read_header(gif_file);
    if (GifScreen.Width % TILE_X) {
        Fprintf(stderr, "error: width %d not divisible by %d\n",
                GifScreen.Width, TILE_X);
        exit(EXIT_FAILURE);
    }
    tiles_across = GifScreen.Width / TILE_X;
    curr_tiles_across = 0;
    if (GifScreen.Height % TILE_Y) {
        Fprintf(stderr, "error: height %d not divisible by %d\n",
                GifScreen.Height, TILE_Y);
        /* exit(EXIT_FAILURE) */;
    }
    tiles_down = GifScreen.Height / TILE_Y;
    curr_tiles_down = 0;

    if (GifScreen.Interlace) {
        /* sigh -- hope this doesn't happen on micros */
        image = (pixel **) alloc(GifScreen.Height * sizeof(pixel *));
        for (i = 0; i < GifScreen.Height; i++) {
            image[i] = (pixel *) alloc(GifScreen.Width * sizeof(pixel));
        }
    } else {
        image = (pixel **) alloc(TILE_Y * sizeof(pixel *));
        for (i = 0; i < TILE_Y; i++) {
            image[i] = (pixel *) alloc(GifScreen.Width * sizeof(pixel));
        }
    }

    /*
    **  Initialize the Compression routines
    */
    if (!ReadOK(gif_file, &input_code_size, 1)) {
        Fprintf(stderr, "EOF / read error on image data\n");
        exit(EXIT_FAILURE);
    }

    if (LWZReadByte(gif_file, TRUE /*, (int) input_code_size*/ ) < 0) {
        Fprintf(stderr, "error reading image\n");
        exit(EXIT_FAILURE);
    }

    /* read first section */