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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // This is a convenience header to pull in the platform-specific | |
6 // headers that define functions for byte-order conversion, | |
7 // particularly: ntohs(), htons(), ntohl(), htonl(). Prefer including | |
8 // this file instead of directly writing the #if / #else, since it | |
9 // avoids duplicating the platform-specific selections. | |
10 // This header also provides ntohll() and htonll() for byte-order conversion | |
11 // for 64-bit integers. | |
12 | |
13 #ifndef BASE_SYS_BYTEORDER_H_ | |
14 #define BASE_SYS_BYTEORDER_H_ | |
15 | |
16 #include "base/basictypes.h" | |
17 #include "build/build_config.h" | |
18 | |
19 #if defined(OS_WIN) | |
20 #include <winsock2.h> | |
21 #else | |
22 #include <arpa/inet.h> | |
23 #endif | |
24 | |
25 // Include headers to provide bswap for all platforms. | |
eroman
2011/12/28 00:50:20
nit: "bswap" isn't very descriptive
Ilya Sherman
2011/12/28 01:20:02
Done.
| |
26 #if defined(COMPILER_MSVC) | |
27 #include <stdlib.h> | |
28 #elif defined(OS_MACOSX) | |
29 #include <libkern/OSByteOrder.h> | |
30 #elif defined(OS_OPENBSD) | |
31 #include <sys/endian.h> | |
32 #else | |
33 #include <byteswap.h> | |
34 #endif | |
35 | |
36 | |
37 namespace base { | |
38 | |
39 // Returns a value with all bytes in |x| swapped, i.e. reverses the endianness. | |
40 inline uint64 ByteSwap(uint64 x) { | |
41 #if defined(COMPILER_MSVC) | |
42 return _byteswap_uint64(x); | |
43 #elif defined(OS_MACOSX) | |
44 return OSSwapInt64(x); | |
45 #elif defined(OS_OPENBSD) | |
46 return swap64(x); | |
47 #else | |
48 return bswap_64(x); | |
49 #endif | |
50 } | |
51 | |
52 // Converts the bytes in |x| from network to host order (endianness), and | |
53 // returns the result. | |
54 inline uint64 ntohll(uint64 x) { | |
55 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
56 return ByteSwap(x); | |
57 #else | |
58 return x; | |
59 #endif | |
60 } | |
61 | |
62 // Converts the bytes in |x| from host to network order (endianness), and | |
63 // returns the result. | |
64 inline uint64 htonll(uint64 x) { | |
65 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
66 return ByteSwap(x); | |
67 #else | |
68 return x; | |
69 #endif | |
70 } | |
71 | |
72 } // namespace base | |
73 | |
74 | |
75 #endif // BASE_SYS_BYTEORDER_H_ | |
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