c
static inline bool DecodeBase64Block(uint8_t *ascii, size_t ascii_size, uint8_t b64[B64_BLOCK]) {
    if (ascii == NULL || ascii_size < 1) {
        return false;
    }
    ascii[0] = (uint8_t) (b64[0] << 2) | (b64[1] >> 4);
    return true;
}
