91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose: Low level byte swapping routines.
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//
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// $NoKeywords: $
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//=============================================================================
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#include "byteswap.h"
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//-----------------------------------------------------------------------------
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// Copy a single field from the input buffer to the output buffer, swapping the bytes if necessary
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//-----------------------------------------------------------------------------
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void CByteswap::SwapFieldToTargetEndian( void* pOutputBuffer, void *pData, typedescription_t *pField )
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{
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switch ( pField->fieldType )
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{
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case FIELD_CHARACTER:
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SwapBufferToTargetEndian<char>( (char*)pOutputBuffer, (char*)pData, pField->fieldSize );
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break;
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case FIELD_BOOLEAN:
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SwapBufferToTargetEndian<bool>( (bool*)pOutputBuffer, (bool*)pData, pField->fieldSize );
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break;
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case FIELD_SHORT:
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SwapBufferToTargetEndian<short>( (short*)pOutputBuffer, (short*)pData, pField->fieldSize );
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break;
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case FIELD_FLOAT:
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SwapBufferToTargetEndian<uint>( (uint*)pOutputBuffer, (uint*)pData, pField->fieldSize );
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break;
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case FIELD_INTEGER:
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SwapBufferToTargetEndian<int>( (int*)pOutputBuffer, (int*)pData, pField->fieldSize );
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break;
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case FIELD_VECTOR:
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SwapBufferToTargetEndian<uint>( (uint*)pOutputBuffer, (uint*)pData, pField->fieldSize * 3 );
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break;
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case FIELD_VECTOR2D:
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SwapBufferToTargetEndian<uint>( (uint*)pOutputBuffer, (uint*)pData, pField->fieldSize * 2 );
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break;
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case FIELD_QUATERNION:
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SwapBufferToTargetEndian<uint>( (uint*)pOutputBuffer, (uint*)pData, pField->fieldSize * 4 );
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break;
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case FIELD_EMBEDDED:
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{
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typedescription_t *pEmbed = pField->td->dataDesc;
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for ( int i = 0; i < pField->fieldSize; ++i )
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{
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SwapFieldsToTargetEndian( (byte*)pOutputBuffer + pEmbed->fieldOffset[ TD_OFFSET_NORMAL ],
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(byte*)pData + pEmbed->fieldOffset[ TD_OFFSET_NORMAL ],
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pField->td );
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pOutputBuffer = (byte*)pOutputBuffer + pField->fieldSizeInBytes;
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pData = (byte*)pData + pField->fieldSizeInBytes;
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}
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}
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break;
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default:
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assert(0);
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}
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}
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//-----------------------------------------------------------------------------
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// Write a block of fields. Works a bit like the saverestore code.
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//-----------------------------------------------------------------------------
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void CByteswap::SwapFieldsToTargetEndian( void *pOutputBuffer, void *pBaseData, datamap_t *pDataMap )
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{
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// deal with base class first
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if ( pDataMap->baseMap )
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{
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SwapFieldsToTargetEndian( pOutputBuffer, pBaseData, pDataMap->baseMap );
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}
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typedescription_t *pFields = pDataMap->dataDesc;
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int fieldCount = pDataMap->dataNumFields;
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for ( int i = 0; i < fieldCount; ++i )
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{
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typedescription_t *pField = &pFields[i];
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SwapFieldToTargetEndian( (BYTE*)pOutputBuffer + pField->fieldOffset[ TD_OFFSET_NORMAL ],
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(BYTE*)pBaseData + pField->fieldOffset[ TD_OFFSET_NORMAL ],
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pField );
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}
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}
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