1 /*
2  * Copyright (c) 2008-2014 Travis Geiselbrecht
3  * Copyright 2016 The Fuchsia Authors
4  *
5  * Use of this source code is governed by a MIT-style
6  * license that can be found in the LICENSE file or at
7  * https://opensource.org/licenses/MIT
8  */
9 #pragma once
10 
11 #include <sys/types.h>
12 
13 #ifndef __BYTE_ORDER__
14 #error Compiler does not provide __BYTE_ORDER__
15 #endif
16 
17 /* the compiler provides it, use what it says */
18 #define LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
19 #define BIG_ENDIAN __ORDER_BIG_ENDIAN__
20 #define BYTE_ORDER __BYTE_ORDER__
21 
22 // define a macro that unconditionally swaps
SWAP_64(uint64_t x)23 static inline uint64_t SWAP_64(uint64_t x) { return __builtin_bswap64(x); }
SWAP_32(uint32_t x)24 static inline uint32_t SWAP_32(uint32_t x) { return __builtin_bswap32(x); }
SWAP_16(uint16_t x)25 static inline uint16_t SWAP_16(uint16_t x) { return __builtin_bswap16(x); }
26 
27 // standard swap macros
28 #if BYTE_ORDER == BIG_ENDIAN
29 #define LE64(val) SWAP_64(val)
30 #define LE32(val) SWAP_32(val)
31 #define LE16(val) SWAP_16(val)
32 #define BE64(val) (val)
33 #define BE32(val) (val)
34 #define BE16(val) (val)
35 #else
36 #define LE64(val) (val)
37 #define LE32(val) (val)
38 #define LE16(val) (val)
39 #define BE64(val) SWAP_64(val)
40 #define BE32(val) SWAP_32(val)
41 #define BE16(val) SWAP_16(val)
42 #endif
43 
44 #define LE32SWAP(var) do { (var) = LE32(var); } while (0)
45 #define LE16SWAP(var) do { (var) = LE16(var); } while (0)
46 #define BE32SWAP(var) do { (var) = BE32(var); } while (0)
47 #define BE16SWAP(var) do { (var) = BE16(var); } while (0)
48 
49 /* classic network byte swap stuff */
50 #define ntohs(n) BE16(n)
51 #define htons(h) BE16(h)
52 #define ntohl(n) BE32(n)
53 #define htonl(h) BE32(h)
54 
55 /* 64-bit network byte swap stuff */
56 #define htobe64(h) BE64(h)
57 #define be64toh(b) BE64(b)
58 
59