Function stbi__hdr_test

lite/example/cpp_example/mge/cv/stb_image.h:7758–7766

}

static int stbi__hdr_test(stbi__context* s) {
    int r = stbi__hdr_test_core(s, "#?RADIANCE\n");
    stbi__rewind(s);
    if (!r) {
        r = stbi__hdr_test_core(s, "#?RGBE\n");
        stbi__rewind(s);
    }
    return r;
}

#define STBI__HDR_BUFLEN 1024
static char* stbi__hdr_gettoken(stbi__context* z, char* buffer) {