2 * FreeRTOS+TCP 191100 experimental
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3 * Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://aws.amazon.com/freertos
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23 * http://www.FreeRTOS.org
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26 /* Standard includes. */
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29 /* FreeRTOS includes. */
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30 #include "FreeRTOS.h"
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34 /* FreeRTOS+TCP includes. */
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35 #include "FreeRTOS_UDP_IP.h"
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36 #include "FreeRTOS_IP.h"
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37 #include "FreeRTOS_Sockets.h"
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38 #include "FreeRTOS_IP_Private.h"
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41 * uxStreamBufferAdd( )
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42 * Adds data to a stream buffer. If uxOffset > 0, data will be written at
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43 * an offset from uxHead while uxHead will not be moved yet. This possibility
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44 * will be used when TCP data is received while earlier data is still missing.
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45 * If 'pucData' equals NULL, the function is called to advance 'uxHead' only.
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47 size_t uxStreamBufferAdd( StreamBuffer_t *pxBuffer, size_t uxOffset, const uint8_t *pucData, size_t uxCount )
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49 size_t uxSpace, uxNextHead, uxFirst;
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51 uxSpace = uxStreamBufferGetSpace( pxBuffer );
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53 /* If uxOffset > 0, items can be placed in front of uxHead */
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54 if( uxSpace > uxOffset )
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56 uxSpace -= uxOffset;
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63 /* The number of bytes that can be written is the minimum of the number of
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64 bytes requested and the number available. */
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65 uxCount = FreeRTOS_min_uint32( uxSpace, uxCount );
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69 uxNextHead = pxBuffer->uxHead;
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71 if( uxOffset != 0u )
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73 /* ( uxOffset > 0 ) means: write in front if the uxHead marker */
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74 uxNextHead += uxOffset;
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75 if( uxNextHead >= pxBuffer->LENGTH )
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77 uxNextHead -= pxBuffer->LENGTH;
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81 if( pucData != NULL )
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83 /* Calculate the number of bytes that can be added in the first
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84 write - which may be less than the total number of bytes that need
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85 to be added if the buffer will wrap back to the beginning. */
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86 uxFirst = FreeRTOS_min_uint32( pxBuffer->LENGTH - uxNextHead, uxCount );
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88 /* Write as many bytes as can be written in the first write. */
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89 memcpy( ( void* ) ( pxBuffer->ucArray + uxNextHead ), pucData, uxFirst );
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91 /* If the number of bytes written was less than the number that
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92 could be written in the first write... */
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93 if( uxCount > uxFirst )
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95 /* ...then write the remaining bytes to the start of the
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97 memcpy( ( void * )pxBuffer->ucArray, pucData + uxFirst, uxCount - uxFirst );
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101 if( uxOffset == 0u )
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103 /* ( uxOffset == 0 ) means: write at uxHead position */
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104 uxNextHead += uxCount;
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105 if( uxNextHead >= pxBuffer->LENGTH )
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107 uxNextHead -= pxBuffer->LENGTH;
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109 pxBuffer->uxHead = uxNextHead;
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112 if( xStreamBufferLessThenEqual( pxBuffer, pxBuffer->uxFront, uxNextHead ) != pdFALSE )
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114 /* Advance the front pointer */
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115 pxBuffer->uxFront = uxNextHead;
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121 /*-----------------------------------------------------------*/
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124 * uxStreamBufferGet( )
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125 * 'uxOffset' can be used to read data located at a certain offset from 'lTail'.
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126 * If 'pucData' equals NULL, the function is called to advance 'lTail' only.
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127 * if 'xPeek' is pdTRUE, or if 'uxOffset' is non-zero, the 'lTail' pointer will
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130 size_t uxStreamBufferGet( StreamBuffer_t *pxBuffer, size_t uxOffset, uint8_t *pucData, size_t uxMaxCount, BaseType_t xPeek )
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132 size_t uxSize, uxCount, uxFirst, uxNextTail;
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134 /* How much data is available? */
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135 uxSize = uxStreamBufferGetSize( pxBuffer );
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137 if( uxSize > uxOffset )
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139 uxSize -= uxOffset;
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146 /* Use the minimum of the wanted bytes and the available bytes. */
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147 uxCount = FreeRTOS_min_uint32( uxSize, uxMaxCount );
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151 uxNextTail = pxBuffer->uxTail;
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153 if( uxOffset != 0u )
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155 uxNextTail += uxOffset;
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156 if( uxNextTail >= pxBuffer->LENGTH )
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158 uxNextTail -= pxBuffer->LENGTH;
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162 if( pucData != NULL )
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164 /* Calculate the number of bytes that can be read - which may be
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165 less than the number wanted if the data wraps around to the start of
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167 uxFirst = FreeRTOS_min_uint32( pxBuffer->LENGTH - uxNextTail, uxCount );
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169 /* Obtain the number of bytes it is possible to obtain in the first
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171 memcpy( pucData, pxBuffer->ucArray + uxNextTail, uxFirst );
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173 /* If the total number of wanted bytes is greater than the number
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174 that could be read in the first read... */
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175 if( uxCount > uxFirst )
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177 /*...then read the remaining bytes from the start of the buffer. */
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178 memcpy( pucData + uxFirst, pxBuffer->ucArray, uxCount - uxFirst );
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182 if( ( xPeek == pdFALSE ) && ( uxOffset == 0UL ) )
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184 /* Move the tail pointer to effecively remove the data read from
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186 uxNextTail += uxCount;
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188 if( uxNextTail >= pxBuffer->LENGTH )
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190 uxNextTail -= pxBuffer->LENGTH;
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193 pxBuffer->uxTail = uxNextTail;
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