ICU 52.1  52.1
LESwaps.h
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1 /*
2  *
3  * (C) Copyright IBM Corp. 1998-2011 - All Rights Reserved
4  *
5  */
6 
7 #ifndef __LESWAPS_H
8 #define __LESWAPS_H
9 
10 #include "LETypes.h"
11 
18 
25 #define SWAPW(value) LESwaps::swapWord((le_uint16)(value))
26 
33 #define SWAPL(value) LESwaps::swapLong((le_uint32)(value))
34 
44 class U_LAYOUT_API LESwaps /* not : public UObject because all methods are static */ {
45 public:
46 
58  {
59 #if (defined(U_IS_BIG_ENDIAN) && U_IS_BIG_ENDIAN) || \
60  (defined(BYTE_ORDER) && defined(BIG_ENDIAN) && (BYTE_ORDER == BIG_ENDIAN)) || \
61  defined(__BIG_ENDIAN__)
62  // Fastpath when we know that the platform is big-endian.
63  return value;
64 #else
65  // Reads a big-endian value on any platform.
66  const le_uint8 *p = reinterpret_cast<const le_uint8 *>(&value);
67  return (le_uint16)((p[0] << 8) | p[1]);
68 #endif
69  };
70 
82  {
83 #if (defined(U_IS_BIG_ENDIAN) && U_IS_BIG_ENDIAN) || \
84  (defined(BYTE_ORDER) && defined(BIG_ENDIAN) && (BYTE_ORDER == BIG_ENDIAN)) || \
85  defined(__BIG_ENDIAN__)
86  // Fastpath when we know that the platform is big-endian.
87  return value;
88 #else
89  // Reads a big-endian value on any platform.
90  const le_uint8 *p = reinterpret_cast<const le_uint8 *>(&value);
91  return (le_uint32)((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
92 #endif
93  };
94 
95 private:
96  LESwaps() {} // private - forbid instantiation
97 };
98 
100 #endif