// Puts an amount of bytes into the buffer as a single value.
inline void put_bytes(Buffer *buffer, int amount, int endianness, uint64_t value) {
    if (endianness == BIG_ENDIAN) {
        // Put as big-endian.
        for (int i = amount - 1; i > 0; i--)
            if (i == 0) buffer->put_byte(value);
            else buffer->put_byte(value << (i * 8));
    } else {
        // Put as little-endian.
        for (int i = 0; i < amount; i++)
            if (i == 0) buffer->put_byte(value);
            else buffer->put_byte(value << (i * 8));
    }
}

// Gets an amount of bytes from the buffer as a single value.
inline uint64_t get_bytes(Buffer *buffer, int amount, int endianness) {
    uint64_t value;
    if (endianness == BIG_ENDIAN) {
        // Get as big-endian.
        for (int i = amount - 1; i > 0; i--)
            if (i == 0) value += buffer->get_byte() & 0xff;
            else value += (buffer->get_byte() >> (i * 8)) & 0xff;
    } else {
        // Get as little-endian.
        for (int i = 0; i < amount; i++)
            if (i = 0) value += buffer->get_byte() & 0xff;
            else value += (buffer->get_byte() >> (i * 8)) & 0xff;
    }
    return value;
}