1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ANDROID_BASE_ENDIAN_H
18 #define ANDROID_BASE_ENDIAN_H
19 
20 /* A cross-platform equivalent of bionic's <sys/endian.h>. */
21 
22 #if defined(__BIONIC__)
23 
24 #include <sys/endian.h>
25 
26 #elif defined(__GLIBC__)
27 
28 /* glibc's <endian.h> is like bionic's <sys/endian.h>. */
29 #include <endian.h>
30 
31 /* glibc keeps htons and htonl in <netinet/in.h>. */
32 #include <netinet/in.h>
33 
34 /* glibc doesn't have the 64-bit variants. */
35 #define htonq(x) htobe64(x)
36 #define ntohq(x) be64toh(x)
37 
38 /* glibc has different names to BSD for these. */
39 #define betoh16(x) be16toh(x)
40 #define betoh32(x) be32toh(x)
41 #define betoh64(x) be64toh(x)
42 
43 #else
44 
45 /* Mac OS and Windows have nothing. */
46 
47 #define __LITTLE_ENDIAN 1234
48 #define LITTLE_ENDIAN __LITTLE_ENDIAN
49 
50 #define __BIG_ENDIAN 4321
51 #define BIG_ENDIAN __BIG_ENDIAN
52 
53 #define __BYTE_ORDER __LITTLE_ENDIAN
54 #define BYTE_ORDER __BYTE_ORDER
55 
56 #define htons(x) __builtin_bswap16(x)
57 #define htonl(x) __builtin_bswap32(x)
58 #define htonq(x) __builtin_bswap64(x)
59 
60 #define ntohs(x) __builtin_bswap16(x)
61 #define ntohl(x) __builtin_bswap32(x)
62 #define ntohq(x) __builtin_bswap64(x)
63 
64 #define htobe16(x) __builtin_bswap16(x)
65 #define htobe32(x) __builtin_bswap32(x)
66 #define htobe64(x) __builtin_bswap64(x)
67 
68 #define betoh16(x) __builtin_bswap16(x)
69 #define betoh32(x) __builtin_bswap32(x)
70 #define betoh64(x) __builtin_bswap64(x)
71 
72 #define htole16(x) (x)
73 #define htole32(x) (x)
74 #define htole64(x) (x)
75 
76 #define letoh16(x) (x)
77 #define letoh32(x) (x)
78 #define letoh64(x) (x)
79 
80 #define be16toh(x) __builtin_bswap16(x)
81 #define be32toh(x) __builtin_bswap32(x)
82 #define be64toh(x) __builtin_bswap64(x)
83 
84 #define le16toh(x) (x)
85 #define le32toh(x) (x)
86 #define le64toh(x) (x)
87 
88 #endif
89 
90 #endif  // ANDROID_BASE_ENDIAN_H
91