Method receive

src/SFML/Network/TcpSocket.cpp:1177–1260

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Socket::Status TcpSocket::receive(void* data, std::size_t size, std::size_t& received)
{
    // First clear the variables to fill
    received = 0;

    // Check the destination buffer
    if (!data)
    {
        err() << "Cannot receive data from the network (the destination buffer is invalid)" << std::endl;
        return Status::Error;
    }

    auto sizeReceived = 0;

    if (m_impl->tlsState)
    {
        // Handle receiving over a TLS stream
        assert(m_impl->tlsState->handshakeComplete && "TLS handshake must be complete before sending application data");

        if (!m_impl->tlsState->handshakeComplete)
        {
            err() << "TLS handshake must be complete before sending application data" << std::endl;
            return Status::Error;
        }

        sizeReceived = mbedtls_ssl_read(&m_impl->tlsState->sslContext, static_cast<unsigned char*>(data), size);

        switch (sizeReceived)
        {
            case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
                [[fallthrough]];
            case MBEDTLS_ERR_NET_CONN_RESET:
                received = 0;
                return Status::Disconnected;
            case MBEDTLS_ERR_SSL_WANT_READ:
                [[fallthrough]];
            case MBEDTLS_ERR_SSL_WANT_WRITE:
                [[fallthrough]];
            case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS:
                [[fallthrough]];
#if defined(MBEDTLS_ERR_SSL_RECEIVED_NEW_SESSION_TICKET)
            case MBEDTLS_ERR_SSL_RECEIVED_NEW_SESSION_TICKET:
                [[fallthrough]];
#endif
            case MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS:
                received = 0;
                return Status::Partial;
            default:
                break;
        }

        // If any other error occurred or the TLS stream has no more data to provide, reset the TLS state
        if (sizeReceived < 0)
        {
            m_impl->tlsState.reset();
            return Status::Error;
        }