ICU 4.8.1.1  4.8.1.1
LESwaps.h
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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) || \
00060     (defined(BYTE_ORDER) && defined(BIG_ENDIAN) && (BYTE_ORDER == BIG_ENDIAN)) || \
00061     defined(__BIG_ENDIAN__)
00062         // Fastpath when we know that the platform is big-endian.
00063         return value;
00064 #else
00065         // Reads a big-endian value on any platform.
00066         const le_uint8 *p = reinterpret_cast<const le_uint8 *>(&value);
00067         return (le_uint16)((p[0] << 8) | p[1]);
00068 #endif
00069     };
00070 
00081     static le_uint32 swapLong(le_uint32 value)
00082     {
00083 #if (defined(U_IS_BIG_ENDIAN) && U_IS_BIG_ENDIAN) || \
00084     (defined(BYTE_ORDER) && defined(BIG_ENDIAN) && (BYTE_ORDER == BIG_ENDIAN)) || \
00085     defined(__BIG_ENDIAN__)
00086         // Fastpath when we know that the platform is big-endian.
00087         return value;
00088 #else
00089         // Reads a big-endian value on any platform.
00090         const le_uint8 *p = reinterpret_cast<const le_uint8 *>(&value);
00091         return (le_uint32)((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
00092 #endif
00093     };
00094 
00095 private:
00096     LESwaps() {} // private - forbid instantiation
00097 };
00098 
00099 U_NAMESPACE_END
00100 #endif
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