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/*
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef TRANSPORT_INTERFACE_H_
#define TRANSPORT_INTERFACE_H_
#include <stdint.h>
#include <stddef.h>
/**
* @brief The NetworkContext is an incomplete type. An implementation of this
* interface must define NetworkContext as per the requirements. This context
* is passed into the network interface functions.
*/
struct NetworkContext;
typedef struct NetworkContext NetworkContext_t;
/**
* @brief Transport interface for receiving data on the network.
*
* @param[in] pNetworkContext Implementation-defined network context.
* @param[in] pBuffer Buffer to receive the data into.
* @param[in] bytesToRecv Number of bytes requested from the network.
*
* @return The number of bytes received or a negative error code.
*/
typedef int32_t ( * TransportRecv_t )( NetworkContext_t * pNetworkContext,
void * pBuffer,
size_t bytesToRecv );
/**
* @brief Transport interface for sending data over the network.
*
* @param[in] pNetworkContext Implementation-defined network context.
* @param[in] pBuffer Buffer containing the bytes to send over the network stack.
* @param[in] bytesToSend Number of bytes to send over the network.
*
* @return The number of bytes sent or a negative error code.
*/
typedef int32_t ( * TransportSend_t )( NetworkContext_t * pNetworkContext,
const void * pBuffer,
size_t bytesToSend );
/**
* @brief The transport layer interface.
*/
typedef struct TransportInterface
{
TransportRecv_t recv; /**< Transport receive interface. */
TransportSend_t send; /**< Transport send interface. */
NetworkContext_t * pNetworkContext; /**< Implementation-defined network context. */
} TransportInterface_t;
#endif /* ifndef TRANSPORT_INTERFACE_H_ */
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