ac2f4d1789
- toolkit V2.8.0.1@14806 - BSL V1.8.0.0@14590 - tcpserver: V1.4.3.0@14676 (marshaller V2.4.0.1@14551)
127 lines
4.4 KiB
C
127 lines
4.4 KiB
C
/**************************************************************************************
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Copyright (c) Hilscher Gesellschaft fuer Systemautomation mbH. All Rights Reserved.
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***************************************************************************************
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$Id: cifXEndianess.c 13253 2019-10-11 10:57:04Z LuisContreras $:
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Description:
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Little/Big Endian conversion
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Changes:
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Date Description
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-----------------------------------------------------------------------------------
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2019-10-11 Change prototype of endianess conversion function
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2018-10-10 - Updated header and definitions to new Hilscher defines
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- Derived from cifX Toolkit V1.6.0.0
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**************************************************************************************/
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/*****************************************************************************/
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/*! \file cifXEndianess.c
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* Little/Big Endian conversion */
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/*****************************************************************************/
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#include "cifXToolkit.h"
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#include "cifXErrors.h"
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#include "cifXEndianess.h"
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/*****************************************************************************/
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/*! Convert a buffer from / to host endianess
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* this structure is used for automatically transforming a structure (which
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* is described by this structure) from/to host endianess */
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/*****************************************************************************/
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int32_t cifXConvertEndianess(unsigned int uiOffset, void* pvBuffer, int iBufferLen,
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const CIFX_ENDIANESS_ENTRY_T* atConv, int iConvLen)
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{
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/* Conversion needs only be done, it host and dpm endianess differ */
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#ifdef CIFX_TOOLKIT_BIGENDIAN
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/* We need to make sure, that we can handle odd offsets, so we are using
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a byte pointer here and build the appropriate data type byte by byte.
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Compilers provide packing/unaligned access in different ways, and we
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are not able to generalize it */
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uint8_t* pbBuffer = (uint8_t*)pvBuffer;
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int iActConvEntry;
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int iActElement;
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#ifdef CIFX_TOOLKIT_PARAMETER_CHECK
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if((NULL == pvBuffer) || (NULL == atConv))
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return CIFX_INVALID_POINTER;
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#endif /* CIFX_TOOLKIT_PARAMETER_CHECK */
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/* On Big-endian targets, the given block shall only be read from start */
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if(0 != uiOffset)
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return CIFX_INVALID_PARAMETER;
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/* Iterate over complete user table */
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for(iActConvEntry = 0; iActConvEntry < iConvLen; ++iActConvEntry)
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{
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/* Iterate over all elements given from this entry. (From iOffset to iOffset + iElementCnt * size) */
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for(iActElement = 0; iActElement < atConv[iActConvEntry].iElementCnt; ++iActElement)
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{
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switch(atConv[iActConvEntry].eWidth)
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{
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case eCIFX_ENDIANESS_WIDTH_8BIT:
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/* nothing to do for 8 bit */
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break;
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case eCIFX_ENDIANESS_WIDTH_16BIT:
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{
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uint16_t usValue;
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int iOffset = atConv[iActConvEntry].iOffset + iActElement * 2;
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if( (iOffset + 2) < iBufferLen)
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{
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OS_Memcpy(&usValue, pbBuffer + iOffset, 2);
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usValue = LE16_TO_HOST(usValue);
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OS_Memcpy(pbBuffer + iOffset, &usValue, 2);
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}
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}
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break;
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case eCIFX_ENDIANESS_WIDTH_32BIT:
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{
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uint32_t ulValue;
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int iOffset = atConv[iActConvEntry].iOffset + iActElement * 4;
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if( (iOffset + 4) < iBufferLen)
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{
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OS_Memcpy(&ulValue, pbBuffer + iOffset, 4);
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ulValue = LE32_TO_HOST(ulValue);
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OS_Memcpy(pbBuffer + iOffset, &ulValue, 4);
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}
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}
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break;
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case eCIFX_ENDIANESS_WIDTH_64BIT:
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{
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uint64_t ullValue;
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int iOffset = atConv[iActConvEntry].iOffset + iActElement * 8;
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if( (iOffset + 8) < iBufferLen)
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{
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OS_Memcpy(&ullValue, pbBuffer + iOffset, 8);
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ullValue = LE64_TO_HOST(ullValue);
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OS_Memcpy(pbBuffer + iOffset, &ullValue, 8);
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}
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}
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break;
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default:
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/* This should never happen */
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break;
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}
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}
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}
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return CIFX_NO_ERROR;
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#else
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UNREFERENCED_PARAMETER(uiOffset);
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UNREFERENCED_PARAMETER(pvBuffer);
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UNREFERENCED_PARAMETER(iBufferLen);
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UNREFERENCED_PARAMETER(atConv);
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UNREFERENCED_PARAMETER(iConvLen);
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return CIFX_NO_ERROR; /*lint !e438 : unused variables */
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#endif /* CIFX_TOOLKIT_BIGENDIAN */
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}
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