2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
3 * Copyright (c) 2005 Robert N. M. Watson
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * Derived from FreeBSD src/sys/sys/endian.h:1.6.
28 * $P4: //depot/projects/trustedbsd/openbsm/compat/endian.h#8 $
31 #ifndef _COMPAT_ENDIAN_H_
32 #define _COMPAT_ENDIAN_H_
35 * Some systems will have the uint/int types defined here already, others
43 * Some operating systems do not yet have the more recent endian APIs that
44 * permit encoding to and decoding from byte streams. For those systems, we
45 * implement local non-optimized versions.
48 static __inline uint16_t
49 bswap16(uint16_t int16)
51 const unsigned char *from;
55 from = (const unsigned char *) &int16;
56 to = (unsigned char *) &t;
64 static __inline uint32_t
65 bswap32(uint32_t int32)
67 const unsigned char *from;
71 from = (const unsigned char *) &int32;
72 to = (unsigned char *) &t;
82 static __inline uint64_t
83 bswap64(uint64_t int64)
85 const unsigned char *from;
89 from = (const unsigned char *) &int64;
90 to = (unsigned char *) &t;
104 #if defined(BYTE_ORDER) && !defined(_BYTE_ORDER)
105 #define _BYTE_ORDER BYTE_ORDER
107 #if !defined(_BYTE_ORDER)
108 #error "Neither BYTE_ORDER nor _BYTE_ORDER defined"
111 #if defined(BIG_ENDIAN) && !defined(_BIG_ENDIAN)
112 #define _BIG_ENDIAN BIG_ENDIAN
115 #if defined(LITTLE_ENDIAN) && !defined(_LITTLE_ENDIAN)
116 #define _LITTLE_ENDIAN LITTLE_ENDIAN
120 * Host to big endian, host to little endian, big endian to host, and little
121 * endian to host byte order functions as detailed in byteorder(9).
123 #if _BYTE_ORDER == _LITTLE_ENDIAN
124 #define htobe16(x) bswap16((x))
125 #define htobe32(x) bswap32((x))
126 #define htobe64(x) bswap64((x))
127 #define htole16(x) ((uint16_t)(x))
128 #define htole32(x) ((uint32_t)(x))
129 #define htole64(x) ((uint64_t)(x))
131 #define be16toh(x) bswap16((x))
132 #define be32toh(x) bswap32((x))
133 #define be64toh(x) bswap64((x))
134 #define le16toh(x) ((uint16_t)(x))
135 #define le32toh(x) ((uint32_t)(x))
136 #define le64toh(x) ((uint64_t)(x))
137 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
138 #define htobe16(x) ((uint16_t)(x))
139 #define htobe32(x) ((uint32_t)(x))
140 #define htobe64(x) ((uint64_t)(x))
141 #define htole16(x) bswap16((x))
142 #define htole32(x) bswap32((x))
143 #define htole64(x) bswap64((x))
145 #define be16toh(x) ((uint16_t)(x))
146 #define be32toh(x) ((uint32_t)(x))
147 #define be64toh(x) ((uint64_t)(x))
148 #define le16toh(x) bswap16((x))
149 #define le32toh(x) bswap32((x))
150 #define le64toh(x) bswap64((x))
151 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
153 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
155 static __inline uint16_t
156 be16dec(const void *pp)
158 unsigned char const *p = (unsigned char const *)pp;
160 return ((p[0] << 8) | p[1]);
163 static __inline uint32_t
164 be32dec(const void *pp)
166 unsigned char const *p = (unsigned char const *)pp;
168 return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
171 static __inline uint64_t
172 be64dec(const void *pp)
174 unsigned char const *p = (unsigned char const *)pp;
176 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
179 static __inline uint16_t
180 le16dec(const void *pp)
182 unsigned char const *p = (unsigned char const *)pp;
184 return ((p[1] << 8) | p[0]);
187 static __inline uint32_t
188 le32dec(const void *pp)
190 unsigned char const *p = (unsigned char const *)pp;
192 return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
195 static __inline uint64_t
196 le64dec(const void *pp)
198 unsigned char const *p = (unsigned char const *)pp;
200 return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
204 be16enc(void *pp, uint16_t u)
206 unsigned char *p = (unsigned char *)pp;
208 p[0] = (u >> 8) & 0xff;
213 be32enc(void *pp, uint32_t u)
215 unsigned char *p = (unsigned char *)pp;
217 p[0] = (u >> 24) & 0xff;
218 p[1] = (u >> 16) & 0xff;
219 p[2] = (u >> 8) & 0xff;
224 be64enc(void *pp, uint64_t u)
226 unsigned char *p = (unsigned char *)pp;
229 be32enc(p + 4, u & 0xffffffff);
233 le16enc(void *pp, uint16_t u)
235 unsigned char *p = (unsigned char *)pp;
238 p[1] = (u >> 8) & 0xff;
242 le32enc(void *pp, uint32_t u)
244 unsigned char *p = (unsigned char *)pp;
247 p[1] = (u >> 8) & 0xff;
248 p[2] = (u >> 16) & 0xff;
249 p[3] = (u >> 24) & 0xff;
253 le64enc(void *pp, uint64_t u)
255 unsigned char *p = (unsigned char *)pp;
257 le32enc(p, u & 0xffffffff);
258 le32enc(p + 4, u >> 32);
261 #endif /* _COMPAT_ENDIAN_H_ */