1HEADmaster

1 files changed, 90 insertions, 0 deletions

diff --git a/tier1/byteswap.cpp b/tier1/byteswap.cpp
new file mode 100644
index 0000000..9f66297
--- /dev/null
+++ b/tier1/byteswap.cpp
@@ -0,0 +1,90 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Low level byte swapping routines.
+//
+// $NoKeywords: $
+//=============================================================================
+
+#include "byteswap.h"
+
+//-----------------------------------------------------------------------------
+// Copy a single field from the input buffer to the output buffer, swapping the bytes if necessary
+//-----------------------------------------------------------------------------
+void CByteswap::SwapFieldToTargetEndian( void* pOutputBuffer, void *pData, typedescription_t *pField )
+{
+	switch ( pField->fieldType )
+	{
+	case FIELD_CHARACTER:
+		SwapBufferToTargetEndian<char>( (char*)pOutputBuffer, (char*)pData, pField->fieldSize );
+		break;
+
+	case FIELD_BOOLEAN:
+		SwapBufferToTargetEndian<bool>( (bool*)pOutputBuffer, (bool*)pData, pField->fieldSize );
+		break;
+
+	case FIELD_SHORT:
+		SwapBufferToTargetEndian<short>( (short*)pOutputBuffer, (short*)pData, pField->fieldSize );
+		break;
+
+	case FIELD_FLOAT:
+		SwapBufferToTargetEndian<uint>( (uint*)pOutputBuffer, (uint*)pData, pField->fieldSize );
+		break;
+
+	case FIELD_INTEGER:
+		SwapBufferToTargetEndian<int>( (int*)pOutputBuffer, (int*)pData, pField->fieldSize );
+		break;
+
+	case FIELD_VECTOR:
+		SwapBufferToTargetEndian<uint>( (uint*)pOutputBuffer, (uint*)pData, pField->fieldSize * 3 );
+		break;
+
+	case FIELD_VECTOR2D:
+		SwapBufferToTargetEndian<uint>( (uint*)pOutputBuffer, (uint*)pData, pField->fieldSize * 2 );
+		break;
+
+	case FIELD_QUATERNION:
+		SwapBufferToTargetEndian<uint>( (uint*)pOutputBuffer, (uint*)pData, pField->fieldSize * 4 );
+		break;
+
+	case FIELD_EMBEDDED:
+		{
+			typedescription_t *pEmbed = pField->td->dataDesc;
+			for ( int i = 0; i < pField->fieldSize; ++i )
+			{
+				SwapFieldsToTargetEndian( (byte*)pOutputBuffer + pEmbed->fieldOffset[ TD_OFFSET_NORMAL ], 
+										(byte*)pData + pEmbed->fieldOffset[ TD_OFFSET_NORMAL ],  
+										pField->td );
+
+				pOutputBuffer = (byte*)pOutputBuffer + pField->fieldSizeInBytes;
+				pData = (byte*)pData + pField->fieldSizeInBytes;
+			}
+		}
+		break;
+		
+	default:
+		assert(0); 
+	}
+}
+
+//-----------------------------------------------------------------------------
+// Write a block of fields. Works a bit like the saverestore code.  
+//-----------------------------------------------------------------------------
+void CByteswap::SwapFieldsToTargetEndian( void *pOutputBuffer, void *pBaseData, datamap_t *pDataMap )
+{	
+	// deal with base class first
+	if ( pDataMap->baseMap )
+	{
+		SwapFieldsToTargetEndian( pOutputBuffer, pBaseData, pDataMap->baseMap );
+	}
+
+	typedescription_t *pFields = pDataMap->dataDesc;
+	int fieldCount = pDataMap->dataNumFields;
+	for ( int i = 0; i < fieldCount; ++i )
+	{
+		typedescription_t *pField = &pFields[i];
+		SwapFieldToTargetEndian( (BYTE*)pOutputBuffer + pField->fieldOffset[ TD_OFFSET_NORMAL ],  
+								 (BYTE*)pBaseData + pField->fieldOffset[ TD_OFFSET_NORMAL ], 
+								  pField );
+	}
+}
+