1 /*
2 * Copyright 2004 The WebRTC Project Authors. All rights reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #ifndef RTC_BASE_BYTE_ORDER_H_
12 #define RTC_BASE_BYTE_ORDER_H_
13
14 #include <stdint.h>
15
16 #if defined(WEBRTC_POSIX) && !defined(__native_client__)
17 #include <arpa/inet.h>
18 #endif
19
20 #include "rtc_base/system/arch.h"
21
22 #if defined(WEBRTC_MAC)
23 #include <libkern/OSByteOrder.h>
24
25 #define htobe16(v) OSSwapHostToBigInt16(v)
26 #define htobe32(v) OSSwapHostToBigInt32(v)
27 #define htobe64(v) OSSwapHostToBigInt64(v)
28 #define be16toh(v) OSSwapBigToHostInt16(v)
29 #define be32toh(v) OSSwapBigToHostInt32(v)
30 #define be64toh(v) OSSwapBigToHostInt64(v)
31
32 #define htole16(v) OSSwapHostToLittleInt16(v)
33 #define htole32(v) OSSwapHostToLittleInt32(v)
34 #define htole64(v) OSSwapHostToLittleInt64(v)
35 #define le16toh(v) OSSwapLittleToHostInt16(v)
36 #define le32toh(v) OSSwapLittleToHostInt32(v)
37 #define le64toh(v) OSSwapLittleToHostInt64(v)
38
39 #elif defined(WEBRTC_WIN) || defined(__native_client__)
40
41 #if defined(WEBRTC_WIN)
42 #include <stdlib.h>
43 #include <winsock2.h>
44 #else
45 #include <netinet/in.h>
46 #endif // defined(WEBRTC_WIN)
47
48 #if defined(WEBRTC_ARCH_LITTLE_ENDIAN)
49 #define htobe16(v) htons(v)
50 #define htobe32(v) htonl(v)
51 #define be16toh(v) ntohs(v)
52 #define be32toh(v) ntohl(v)
53 #define htole16(v) (v)
54 #define htole32(v) (v)
55 #define htole64(v) (v)
56 #define le16toh(v) (v)
57 #define le32toh(v) (v)
58 #define le64toh(v) (v)
59 #if defined(WEBRTC_WIN)
60 #define htobe64(v) _byteswap_uint64(v)
61 #define be64toh(v) _byteswap_uint64(v)
62 #endif // defined(WEBRTC_WIN)
63 #if defined(__native_client__)
64 #define htobe64(v) __builtin_bswap64(v)
65 #define be64toh(v) __builtin_bswap64(v)
66 #endif // defined(__native_client__)
67
68 #elif defined(WEBRTC_ARCH_BIG_ENDIAN)
69 #define htobe16(v) (v)
70 #define htobe32(v) (v)
71 #define be16toh(v) (v)
72 #define be32toh(v) (v)
73 #define htole16(v) __builtin_bswap16(v)
74 #define htole32(v) __builtin_bswap32(v)
75 #define htole64(v) __builtin_bswap64(v)
76 #define le16toh(v) __builtin_bswap16(v)
77 #define le32toh(v) __builtin_bswap32(v)
78 #define le64toh(v) __builtin_bswap64(v)
79 #if defined(WEBRTC_WIN)
80 #define htobe64(v) (v)
81 #define be64toh(v) (v)
82 #endif // defined(WEBRTC_WIN)
83 #if defined(__native_client__)
84 #define htobe64(v) (v)
85 #define be64toh(v) (v)
86 #endif // defined(__native_client__)
87 #else
88 #error WEBRTC_ARCH_BIG_ENDIAN or WEBRTC_ARCH_LITTLE_ENDIAN must be defined.
89 #endif // defined(WEBRTC_ARCH_LITTLE_ENDIAN)
90
91 #elif defined(WEBRTC_POSIX)
92 #include <endian.h>
93 #else
94 #error "Missing byte order functions for this arch."
95 #endif // defined(WEBRTC_MAC)
96
97 namespace rtc {
98
99 // Reading and writing of little and big-endian numbers from memory
100
Set8(void * memory,size_t offset,uint8_t v)101 inline void Set8(void* memory, size_t offset, uint8_t v) {
102 static_cast<uint8_t*>(memory)[offset] = v;
103 }
104
Get8(const void * memory,size_t offset)105 inline uint8_t Get8(const void* memory, size_t offset) {
106 return static_cast<const uint8_t*>(memory)[offset];
107 }
108
SetBE16(void * memory,uint16_t v)109 inline void SetBE16(void* memory, uint16_t v) {
110 *static_cast<uint16_t*>(memory) = htobe16(v);
111 }
112
SetBE32(void * memory,uint32_t v)113 inline void SetBE32(void* memory, uint32_t v) {
114 *static_cast<uint32_t*>(memory) = htobe32(v);
115 }
116
SetBE64(void * memory,uint64_t v)117 inline void SetBE64(void* memory, uint64_t v) {
118 *static_cast<uint64_t*>(memory) = htobe64(v);
119 }
120
GetBE16(const void * memory)121 inline uint16_t GetBE16(const void* memory) {
122 return be16toh(*static_cast<const uint16_t*>(memory));
123 }
124
GetBE32(const void * memory)125 inline uint32_t GetBE32(const void* memory) {
126 return be32toh(*static_cast<const uint32_t*>(memory));
127 }
128
GetBE64(const void * memory)129 inline uint64_t GetBE64(const void* memory) {
130 return be64toh(*static_cast<const uint64_t*>(memory));
131 }
132
SetLE16(void * memory,uint16_t v)133 inline void SetLE16(void* memory, uint16_t v) {
134 *static_cast<uint16_t*>(memory) = htole16(v);
135 }
136
SetLE32(void * memory,uint32_t v)137 inline void SetLE32(void* memory, uint32_t v) {
138 *static_cast<uint32_t*>(memory) = htole32(v);
139 }
140
SetLE64(void * memory,uint64_t v)141 inline void SetLE64(void* memory, uint64_t v) {
142 *static_cast<uint64_t*>(memory) = htole64(v);
143 }
144
GetLE16(const void * memory)145 inline uint16_t GetLE16(const void* memory) {
146 return le16toh(*static_cast<const uint16_t*>(memory));
147 }
148
GetLE32(const void * memory)149 inline uint32_t GetLE32(const void* memory) {
150 return le32toh(*static_cast<const uint32_t*>(memory));
151 }
152
GetLE64(const void * memory)153 inline uint64_t GetLE64(const void* memory) {
154 return le64toh(*static_cast<const uint64_t*>(memory));
155 }
156
157 // Check if the current host is big endian.
IsHostBigEndian()158 inline bool IsHostBigEndian() {
159 #if defined(WEBRTC_ARCH_BIG_ENDIAN)
160 return true;
161 #else
162 return false;
163 #endif
164 }
165
HostToNetwork16(uint16_t n)166 inline uint16_t HostToNetwork16(uint16_t n) {
167 return htobe16(n);
168 }
169
HostToNetwork32(uint32_t n)170 inline uint32_t HostToNetwork32(uint32_t n) {
171 return htobe32(n);
172 }
173
HostToNetwork64(uint64_t n)174 inline uint64_t HostToNetwork64(uint64_t n) {
175 return htobe64(n);
176 }
177
NetworkToHost16(uint16_t n)178 inline uint16_t NetworkToHost16(uint16_t n) {
179 return be16toh(n);
180 }
181
NetworkToHost32(uint32_t n)182 inline uint32_t NetworkToHost32(uint32_t n) {
183 return be32toh(n);
184 }
185
NetworkToHost64(uint64_t n)186 inline uint64_t NetworkToHost64(uint64_t n) {
187 return be64toh(n);
188 }
189
190 } // namespace rtc
191
192 #endif // RTC_BASE_BYTE_ORDER_H_
193