2 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
4 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $FreeBSD: src/sys/sys/endian.h,v 1.2.2.1 2002/09/09 05:45:04 imp Exp $
29 * $DragonFly: src/sys/sys/endian.h,v 1.4 2004/08/24 06:10:57 joerg Exp $
32 #ifndef _SYS_ENDIAN_H_
33 #define _SYS_ENDIAN_H_
35 #include <sys/types.h>
38 * General byte order swapping functions.
40 #define bswap16(x) __bswap16(x)
41 #define bswap32(x) __bswap32(x)
42 #define bswap64(x) __bswap64(x)
45 * Host to big endian, host to little endian, big endian to host, and little
46 * endian to host byte order functions as detailed in byteorder(9).
48 #if _BYTE_ORDER == _LITTLE_ENDIAN
49 #define htobe16(x) bswap16((x))
50 #define htobe32(x) bswap32((x))
51 #define htobe64(x) bswap64((x))
52 #define htole16(x) ((uint16_t)(x))
53 #define htole32(x) ((uint32_t)(x))
54 #define htole64(x) ((uint64_t)(x))
56 #define be16toh(x) bswap16((x))
57 #define be32toh(x) bswap32((x))
58 #define be64toh(x) bswap64((x))
59 #define le16toh(x) ((uint16_t)(x))
60 #define le32toh(x) ((uint32_t)(x))
61 #define le64toh(x) ((uint64_t)(x))
62 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
63 #define htobe16(x) ((uint16_t)(x))
64 #define htobe32(x) ((uint32_t)(x))
65 #define htobe64(x) ((uint64_t)(x))
66 #define htole16(x) bswap16((x))
67 #define htole32(x) bswap32((x))
68 #define htole64(x) bswap64((x))
70 #define be16toh(x) ((uint16_t)(x))
71 #define be32toh(x) ((uint32_t)(x))
72 #define be64toh(x) ((uint64_t)(x))
73 #define le16toh(x) bswap16((x))
74 #define le32toh(x) bswap32((x))
75 #define le64toh(x) bswap64((x))
76 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
78 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
80 static __inline uint16_t
81 be16dec(const void *pp)
83 const uint8_t *p = (const uint8_t *)pp;
85 return ((p[0] << 8) | p[1]);
88 static __inline uint32_t
89 be32dec(const void *pp)
91 const uint8_t *p = (const uint8_t *)pp;
93 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
96 static __inline uint64_t
97 be64dec(const void *pp)
99 const uint8_t *p = (const uint8_t *)pp;
101 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
104 static __inline uint16_t
105 le16dec(const void *pp)
107 const uint8_t *p = (const uint8_t *)pp;
109 return ((p[1] << 8) | p[0]);
112 static __inline uint32_t
113 le32dec(const void *pp)
115 const uint8_t *p = (const uint8_t *)pp;
117 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
120 static __inline uint64_t
121 le64dec(const void *pp)
123 const uint8_t *p = (const uint8_t *)pp;
125 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
129 be16enc(void *pp, uint16_t u)
131 uint8_t *p = (uint8_t *)pp;
133 p[0] = (u >> 8) & 0xff;
138 be32enc(void *pp, uint32_t u)
140 uint8_t *p = (uint8_t *)pp;
142 p[0] = (u >> 24) & 0xff;
143 p[1] = (u >> 16) & 0xff;
144 p[2] = (u >> 8) & 0xff;
149 be64enc(void *pp, uint64_t u)
151 uint8_t *p = (uint8_t *)pp;
154 be32enc(p + 4, u & 0xffffffff);
158 le16enc(void *pp, uint16_t u)
160 uint8_t *p = (uint8_t *)pp;
163 p[1] = (u >> 8) & 0xff;
167 le32enc(void *pp, uint32_t u)
169 uint8_t *p = (uint8_t *)pp;
172 p[1] = (u >> 8) & 0xff;
173 p[2] = (u >> 16) & 0xff;
174 p[3] = (u >> 24) & 0xff;
178 le64enc(void *pp, uint64_t u)
180 uint8_t *p = (uint8_t *)pp;
182 le32enc(p, u & 0xffffffff);
183 le32enc(p + 4, u >> 32);
186 #endif /* _SYS_ENDIAN_H_ */