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src/libCom/osi/os/default/osiWireFormat.h

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+
+/*  
+ *  $Id$
+ *
+ *                              
+ *                    L O S  A L A M O S
+ *              Los Alamos National Laboratory
+ *               Los Alamos, New Mexico 87545
+ *                                  
+ *  Copyright, 2000, The Regents of the University of California.
+ *                                  
+ *           
+ *	Author Jeffrey O. Hill
+ *	johill@lanl.gov
+ */
+
+#ifndef osiWireFormat
+#define osiWireFormat
+
+#include "epicsTypes.h"
+
+//
+// The default assumption is that the local floating point format is
+// IEEE and that these routines only need to perform byte swapping
+// as a side effect of copying an aligned operand into an unaligned 
+// network byte stream.
+//
+
+// this endian test should vanish during optimization
+// and therefore be executed only at compile time
+inline bool osiLittleEndian ()
+{
+    static const unsigned endianTest = 1u;
+    static const char * const pEndianTest = reinterpret_cast < const char * > ( &endianTest );
+    if ( *pEndianTest ) {
+        return true;
+    }
+    else {
+        return false;
+    }
+}
+
+inline void osiConvertToWireFormat ( const epicsFloat32 &value, unsigned char *pWire )
+{
+    const epicsUInt32 * pValue = reinterpret_cast < const epicsUInt32 * > ( &value );
+    pWire[0u] = static_cast < unsigned char > ( *pValue >> 24u );
+    pWire[1u] = static_cast < unsigned char > ( *pValue >> 16u );
+    pWire[2u] = static_cast < unsigned char > ( *pValue >> 8u );
+    pWire[3u] = static_cast < unsigned char > ( *pValue >> 0u );
+}
+
+inline void osiConvertToWireFormat ( const epicsFloat64 &value, unsigned char *pWire )
+{
+    const epicsUInt32 *pValue = reinterpret_cast < const epicsUInt32 *> ( &value );
+    // this endian test should vanish during optimization
+    if ( osiLittleEndian () ) {
+        // little endian
+        pWire[0u] = static_cast < unsigned char > ( pValue[1] >> 24u );
+        pWire[1u] = static_cast < unsigned char > ( pValue[1] >> 16u );
+        pWire[2u] = static_cast < unsigned char > ( pValue[1] >> 8u );
+        pWire[3u] = static_cast < unsigned char > ( pValue[1] >> 0u );
+        pWire[4u] = static_cast < unsigned char > ( pValue[0] >> 24u );
+        pWire[5u] = static_cast < unsigned char > ( pValue[0] >> 16u );
+        pWire[6u] = static_cast < unsigned char > ( pValue[0] >> 8u );
+        pWire[7u] = static_cast < unsigned char > ( pValue[0] >> 0u );
+    }
+    else {
+        // big endian
+        pWire[0u] = static_cast < unsigned char > ( pValue[0] >> 24u );
+        pWire[1u] = static_cast < unsigned char > ( pValue[0] >> 16u );
+        pWire[2u] = static_cast < unsigned char > ( pValue[0] >> 8u );
+        pWire[3u] = static_cast < unsigned char > ( pValue[0] >> 0u );
+        pWire[4u] = static_cast < unsigned char > ( pValue[1] >> 24u );
+        pWire[5u] = static_cast < unsigned char > ( pValue[1] >> 16u );
+        pWire[6u] = static_cast < unsigned char > ( pValue[1] >> 8u );
+        pWire[7u] = static_cast < unsigned char > ( pValue[1] >> 0u );
+    }
+}
+
+#endif // osiWireFormat