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1 /* | |
2 * libjingle | |
3 * Copyright 2004--2005, Google Inc. | |
tommi (sloooow) - chröme
2012/02/28 21:32:18
2012?
Is this the correct license header?
Ronghua Wu (Left Chromium)
2012/02/28 23:16:57
This is from the original code from libjingle. Do
tommi (sloooow) - chröme
2012/02/29 09:54:22
ah, nevermind then.
| |
4 * | |
5 * Redistribution and use in source and binary forms, with or without | |
6 * modification, are permitted provided that the following conditions are met: | |
7 * | |
8 * 1. Redistributions of source code must retain the above copyright notice, | |
9 * this list of conditions and the following disclaimer. | |
10 * 2. Redistributions in binary form must reproduce the above copyright notice, | |
11 * this list of conditions and the following disclaimer in the documentation | |
12 * and/or other materials provided with the distribution. | |
13 * 3. The name of the author may not be used to endorse or promote products | |
14 * derived from this software without specific prior written permission. | |
15 * | |
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 */ | |
27 | |
28 #ifndef TALK_BASE_BYTEORDER_H__ | |
tommi (sloooow) - chröme
2012/02/28 21:32:18
should be only one trailing _
Ronghua Wu (Left Chromium)
2012/02/28 23:16:57
This is the libjingle code, I didn't change it.
tommi (sloooow) - chröme
2012/02/29 09:54:22
ok. sgtm.
| |
29 #define TALK_BASE_BYTEORDER_H__ | |
30 | |
31 #ifdef POSIX | |
32 #include <arpa/inet.h> | |
33 #endif | |
34 | |
35 #ifdef WIN32 | |
36 #include "talk/base/win32.h" | |
37 #endif | |
38 | |
39 #include "talk/base/basictypes.h" | |
40 | |
41 namespace talk_base { | |
42 | |
43 // Reading and writing of little and big-endian numbers from memory | |
44 // TODO: Add HostEndian #defines (HE) | |
45 // TODO: Consider NetworkEndian as synonym for BigEndian, for clarity in use. | |
46 // TODO: Consider creating optimized versions, such as direct read/writes of | |
47 // integers in host-endian format, when the platform supports it. | |
48 | |
49 inline void Set8(void* memory, size_t offset, uint8 v) { | |
50 static_cast<uint8*>(memory)[offset] = v; | |
51 } | |
52 inline uint8 Get8(const void* memory, size_t offset) { | |
53 return static_cast<const uint8*>(memory)[offset]; | |
54 } | |
55 | |
56 inline void SetBE16(void* memory, uint16 v) { | |
57 Set8(memory, 0, static_cast<uint8>(v >> 8)); | |
58 Set8(memory, 1, static_cast<uint8>(v >> 0)); | |
59 } | |
60 inline void SetBE32(void* memory, uint32 v) { | |
61 Set8(memory, 0, static_cast<uint8>(v >> 24)); | |
62 Set8(memory, 1, static_cast<uint8>(v >> 16)); | |
63 Set8(memory, 2, static_cast<uint8>(v >> 8)); | |
64 Set8(memory, 3, static_cast<uint8>(v >> 0)); | |
65 } | |
66 inline void SetBE64(void* memory, uint64 v) { | |
67 Set8(memory, 0, static_cast<uint8>(v >> 56)); | |
68 Set8(memory, 1, static_cast<uint8>(v >> 48)); | |
69 Set8(memory, 2, static_cast<uint8>(v >> 40)); | |
70 Set8(memory, 3, static_cast<uint8>(v >> 32)); | |
71 Set8(memory, 4, static_cast<uint8>(v >> 24)); | |
72 Set8(memory, 5, static_cast<uint8>(v >> 16)); | |
73 Set8(memory, 6, static_cast<uint8>(v >> 8)); | |
74 Set8(memory, 7, static_cast<uint8>(v >> 0)); | |
75 } | |
76 inline uint16 GetBE16(const void* memory) { | |
77 return (static_cast<uint16>(Get8(memory, 0)) << 8) | |
78 | (static_cast<uint16>(Get8(memory, 1)) << 0); | |
79 } | |
80 inline uint32 GetBE32(const void* memory) { | |
81 return (static_cast<uint32>(Get8(memory, 0)) << 24) | |
82 | (static_cast<uint32>(Get8(memory, 1)) << 16) | |
83 | (static_cast<uint32>(Get8(memory, 2)) << 8) | |
84 | (static_cast<uint32>(Get8(memory, 3)) << 0); | |
85 } | |
86 inline uint64 GetBE64(const void* memory) { | |
87 return (static_cast<uint64>(Get8(memory, 0)) << 56) | |
88 | (static_cast<uint64>(Get8(memory, 1)) << 48) | |
89 | (static_cast<uint64>(Get8(memory, 2)) << 40) | |
90 | (static_cast<uint64>(Get8(memory, 3)) << 32) | |
91 | (static_cast<uint64>(Get8(memory, 4)) << 24) | |
92 | (static_cast<uint64>(Get8(memory, 5)) << 16) | |
93 | (static_cast<uint64>(Get8(memory, 6)) << 8) | |
94 | (static_cast<uint64>(Get8(memory, 7)) << 0); | |
95 } | |
96 | |
97 inline void SetLE16(void* memory, uint16 v) { | |
98 Set8(memory, 1, static_cast<uint8>(v >> 8)); | |
99 Set8(memory, 0, static_cast<uint8>(v >> 0)); | |
100 } | |
101 inline void SetLE32(void* memory, uint32 v) { | |
102 Set8(memory, 3, static_cast<uint8>(v >> 24)); | |
103 Set8(memory, 2, static_cast<uint8>(v >> 16)); | |
104 Set8(memory, 1, static_cast<uint8>(v >> 8)); | |
105 Set8(memory, 0, static_cast<uint8>(v >> 0)); | |
106 } | |
107 inline void SetLE64(void* memory, uint64 v) { | |
108 Set8(memory, 7, static_cast<uint8>(v >> 56)); | |
109 Set8(memory, 6, static_cast<uint8>(v >> 48)); | |
110 Set8(memory, 5, static_cast<uint8>(v >> 40)); | |
111 Set8(memory, 4, static_cast<uint8>(v >> 32)); | |
112 Set8(memory, 3, static_cast<uint8>(v >> 24)); | |
113 Set8(memory, 2, static_cast<uint8>(v >> 16)); | |
114 Set8(memory, 1, static_cast<uint8>(v >> 8)); | |
115 Set8(memory, 0, static_cast<uint8>(v >> 0)); | |
116 } | |
117 inline uint16 GetLE16(const void* memory) { | |
118 return (static_cast<uint16>(Get8(memory, 1)) << 8) | |
119 | (static_cast<uint16>(Get8(memory, 0)) << 0); | |
120 } | |
121 inline uint32 GetLE32(const void* memory) { | |
122 return (static_cast<uint32>(Get8(memory, 3)) << 24) | |
123 | (static_cast<uint32>(Get8(memory, 2)) << 16) | |
124 | (static_cast<uint32>(Get8(memory, 1)) << 8) | |
125 | (static_cast<uint32>(Get8(memory, 0)) << 0); | |
126 } | |
127 inline uint64 GetLE64(const void* memory) { | |
128 return (static_cast<uint64>(Get8(memory, 7)) << 56) | |
129 | (static_cast<uint64>(Get8(memory, 6)) << 48) | |
130 | (static_cast<uint64>(Get8(memory, 5)) << 40) | |
131 | (static_cast<uint64>(Get8(memory, 4)) << 32) | |
132 | (static_cast<uint64>(Get8(memory, 3)) << 24) | |
133 | (static_cast<uint64>(Get8(memory, 2)) << 16) | |
134 | (static_cast<uint64>(Get8(memory, 1)) << 8) | |
135 | (static_cast<uint64>(Get8(memory, 0)) << 0); | |
136 } | |
137 | |
138 // Check if the current host is big endian. | |
139 inline bool IsHostBigEndian() { | |
140 static const int number = 1; | |
141 return (0 == *reinterpret_cast<const char*>(&number)); | |
142 } | |
143 | |
144 inline uint16 HostToNetwork16(uint16 n) { | |
145 return htons(n); | |
146 } | |
147 | |
148 inline uint32 HostToNetwork32(uint32 n) { | |
149 return htonl(n); | |
150 } | |
151 | |
152 inline uint64 HostToNetwork64(uint64 n) { | |
153 // If the host is little endian, GetBE64 converts n to big network endian. | |
154 return IsHostBigEndian() ? n : GetBE64(&n); | |
155 } | |
156 | |
157 inline uint16 NetworkToHost16(uint16 n) { | |
158 return ntohs(n); | |
159 } | |
160 | |
161 inline uint32 NetworkToHost32(uint32 n) { | |
162 return ntohl(n); | |
163 } | |
164 | |
165 inline uint64 NetworkToHost64(uint64 n) { | |
166 // If the host is little endian, GetBE64 converts n to little endian. | |
167 return IsHostBigEndian() ? n : GetBE64(&n); | |
168 } | |
169 | |
170 } // namespace talk_base | |
171 | |
172 #endif // TALK_BASE_BYTEORDER_H__ | |
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