ICU 4.8.1 4.8.1
LESwaps.h
Go to the documentation of this file.
00001 /*
00002  *
00003  * (C) Copyright IBM Corp. 1998-2011 - All Rights Reserved
00004  *
00005  */
00006 
00007 #ifndef __LESWAPS_H
00008 #define __LESWAPS_H
00009 
00010 #include "LETypes.h"
00011 
00017 U_NAMESPACE_BEGIN
00018 
00025 #define SWAPW(value) LESwaps::swapWord((le_uint16)(value))
00026 
00033 #define SWAPL(value) LESwaps::swapLong((le_uint32)(value))
00034 
00044 class U_LAYOUT_API LESwaps /* not : public UObject because all methods are static */ {
00045 public:
00046 
00057     static le_uint16 swapWord(le_uint16 value)
00058     {
00059 #if (defined(U_IS_BIG_ENDIAN) && U_IS_BIG_ENDIAN) || (defined(BYTE_ORDER) && defined(BIG_ENDIAN)) || defined(__BIG_ENDIAN__)
00060         // Fastpath when we know that the platform is big-endian.
00061         return value;
00062 #else
00063         // Reads a big-endian value on any platform.
00064         const le_uint8 *p = reinterpret_cast<const le_uint8 *>(&value);
00065         return (le_uint16)((p[0] << 8) | p[1]);
00066 #endif
00067     };
00068 
00079     static le_uint32 swapLong(le_uint32 value)
00080     {
00081 #if (defined(U_IS_BIG_ENDIAN) && U_IS_BIG_ENDIAN) || (defined(BYTE_ORDER) && defined(BIG_ENDIAN)) || defined(__BIG_ENDIAN__)
00082         // Fastpath when we know that the platform is big-endian.
00083         return value;
00084 #else
00085         // Reads a big-endian value on any platform.
00086         const le_uint8 *p = reinterpret_cast<const le_uint8 *>(&value);
00087         return (le_uint32)((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
00088 #endif
00089     };
00090 
00091 private:
00092     LESwaps() {} // private - forbid instantiation
00093 };
00094 
00095 U_NAMESPACE_END
00096 #endif
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Friends Defines