Function stbi__grow_buffer_unsafe

lite/example/cpp_example/mge/cv/stb_image.h:2218–2234

}

static void stbi__grow_buffer_unsafe(stbi__jpeg* j) {
    do {
        unsigned int b = j->nomore ? 0 : stbi__get8(j->s);
        if (b == 0xff) {
            int c = stbi__get8(j->s);
            while (c == 0xff)
                c = stbi__get8(j->s);  // consume fill bytes
            if (c != 0) {
                j->marker = (unsigned char)c;
                j->nomore = 1;
                return;
            }
        }
        j->code_buffer |= b << (24 - j->code_bits);
        j->code_bits += 8;
    } while (j->code_bits <= 24);
}

// (1 << n) - 1
static const stbi__uint32 stbi__bmask[17] = {0,    1,    3,     7,     15,   31,