Function stbi__bmp_test_raw

lite/example/cpp_example/mge/cv/stb_image.h:5883–5897

#ifndef STBI_NO_BMP
static int stbi__bmp_test_raw(stbi__context* s) {
    int r;
    int sz;
    if (stbi__get8(s) != 'B')
        return 0;
    if (stbi__get8(s) != 'M')
        return 0;
    stbi__get32le(s);  // discard filesize
    stbi__get16le(s);  // discard reserved
    stbi__get16le(s);  // discard reserved
    stbi__get32le(s);  // discard data offset
    sz = stbi__get32le(s);
    r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
    return r;
}

static int stbi__bmp_test(stbi__context* s) {
    int r = stbi__bmp_test_raw(s);