amt630hv160-sdk-release/amt630hv160-freertos-beta/FreeRTOS-Plus/FreeRTOS-Plus-TCP/include/NetworkBufferManagement.h

/*
 * FreeRTOS+TCP V2.3.2 LTS Patch 1
 * 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.
 *
 * http://aws.amazon.com/freertos
 * http://www.FreeRTOS.org
 */

#ifndef NETWORK_BUFFER_MANAGEMENT_H
    #define NETWORK_BUFFER_MANAGEMENT_H

    #ifdef __cplusplus
        extern "C" {
    #endif

/* NOTE PUBLIC API FUNCTIONS. */
    BaseType_t xNetworkBuffersInitialise( void );
    NetworkBufferDescriptor_t * pxGetNetworkBufferWithDescriptor( size_t xRequestedSizeBytes,
                                                                  TickType_t xBlockTimeTicks );

/* The definition of the below function is only available if BufferAllocation_2.c has been linked into the source. */
    NetworkBufferDescriptor_t * pxNetworkBufferGetFromISR( size_t xRequestedSizeBytes );
    void vReleaseNetworkBufferAndDescriptor( NetworkBufferDescriptor_t * const pxNetworkBuffer );

/* The definition of the below function is only available if BufferAllocation_2.c has been linked into the source. */
    BaseType_t vNetworkBufferReleaseFromISR( NetworkBufferDescriptor_t * const pxNetworkBuffer );
    uint8_t * pucGetNetworkBuffer( size_t * pxRequestedSizeBytes );
    void vReleaseNetworkBuffer( uint8_t * pucEthernetBuffer );

/* Get the current number of free network buffers. */
    UBaseType_t uxGetNumberOfFreeNetworkBuffers( void );

/* Get the lowest number of free network buffers. */
    UBaseType_t uxGetMinimumFreeNetworkBuffers( void );

/* Copy a network buffer into a bigger buffer. */
    NetworkBufferDescriptor_t * pxDuplicateNetworkBufferWithDescriptor( const NetworkBufferDescriptor_t * const pxNetworkBuffer,
                                                                        size_t uxNewLength );

/* Increase the size of a Network Buffer.
 * In case BufferAllocation_2.c is used, the new space must be allocated. */
    NetworkBufferDescriptor_t * pxResizeNetworkBufferWithDescriptor( NetworkBufferDescriptor_t * pxNetworkBuffer,
                                                                     size_t xNewSizeBytes );

    #if ipconfigTCP_IP_SANITY

/*
 * Check if an address is a valid pointer to a network descriptor
 * by looking it up in the array of network descriptors
 */
        UBaseType_t bIsValidNetworkDescriptor( const NetworkBufferDescriptor_t * pxDesc );
        BaseType_t prvIsFreeBuffer( const NetworkBufferDescriptor_t * pxDescr );
    #endif

    #ifdef __cplusplus
        } /* extern "C" */
    #endif

#endif /* NETWORK_BUFFER_MANAGEMENT_H */