Function stbi__gif_test_raw

lite/example/cpp_example/mge/cv/stb_image.h:7213–7224

} stbi__gif;

static int stbi__gif_test_raw(stbi__context* s) {
    int sz;
    if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' ||
        stbi__get8(s) != '8')
        return 0;
    sz = stbi__get8(s);
    if (sz != '9' && sz != '7')
        return 0;
    if (stbi__get8(s) != 'a')
        return 0;
    return 1;
}

static int stbi__gif_test(stbi__context* s) {
    int r = stbi__gif_test_raw(s);