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LESwaps.h
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1 /*
2 *
3 * (C) Copyright IBM Corp. 1998-2014 - All Rights Reserved
4 *
5 */
6
7 #ifndef __LESWAPS_H
8 #define __LESWAPS_H
9
10 #include "LETypes.h"
11
17 U_NAMESPACE_BEGIN
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
57 static le_uint16 swapWord(le_uint16 value)
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
81 static le_uint32 swapLong(le_uint32 value)
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
99 U_NAMESPACE_END
100 #endif