FreeBSD/Linux Kernel Cross Reference
sys/sys/mchain.h
1 /*
2 * Copyright (c) 2000, 2001 Boris Popov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: releng/5.0/sys/sys/mchain.h 106667 2002-11-08 21:26:32Z jhb $
33 */
34 #ifndef _SYS_MCHAIN_H_
35 #define _SYS_MCHAIN_H_
36
37 #include <machine/endian.h>
38
39 #ifdef _KERNEL
40
41 /*
42 * XXX: remove these defines and change the function calls in the code. Use
43 * it unconditionally if (when) the extended byte order functions become
44 * available in user space.
45 */
46 #define htoles(x) htole16((x))
47 #define letohs(x) le16toh((x))
48 #define htolel(x) htole32((x))
49 #define letohl(x) le32toh((x))
50 #define htoleq(x) htole64((int64_t)(x))
51 #define letohq(x) le64toh((int64_t)(x))
52
53 #define htobes(x) htobe16((x))
54 #define betohs(x) be16toh((x))
55 #define htobel(x) htobe32((x))
56 #define betohl(x) be32toh((x))
57 #define htobeq(x) htobe64((int64_t)(x))
58 #define betohq(x) be64toh((int64_t)(x))
59
60 #else
61 /*
62 * This macros probably belongs to the endian.h
63 */
64 #if (BYTE_ORDER == LITTLE_ENDIAN)
65
66 #define htoles(x) ((u_int16_t)(x))
67 #define letohs(x) ((u_int16_t)(x))
68 #define htolel(x) ((u_int32_t)(x))
69 #define letohl(x) ((u_int32_t)(x))
70 #define htoleq(x) ((int64_t)(x))
71 #define letohq(x) ((int64_t)(x))
72
73 #define htobes(x) (__htons(x))
74 #define betohs(x) (__ntohs(x))
75 #define htobel(x) (__htonl(x))
76 #define betohl(x) (__ntohl(x))
77
78 static __inline int64_t
79 htobeq(int64_t x)
80 {
81 return (int64_t)__htonl((u_int32_t)(x >> 32)) |
82 (int64_t)__htonl((u_int32_t)(x & 0xffffffff)) << 32;
83 }
84
85 static __inline int64_t
86 betohq(int64_t x)
87 {
88 return (int64_t)__ntohl((u_int32_t)(x >> 32)) |
89 (int64_t)__ntohl((u_int32_t)(x & 0xffffffff)) << 32;
90 }
91
92 #else /* (BYTE_ORDER == LITTLE_ENDIAN) */
93
94 #error "Macros for Big-Endians are incomplete"
95
96 /*
97 #define htoles(x) ((u_int16_t)(x))
98 #define letohs(x) ((u_int16_t)(x))
99 #define htolel(x) ((u_int32_t)(x))
100 #define letohl(x) ((u_int32_t)(x))
101 */
102 #endif /* (BYTE_ORDER == LITTLE_ENDIAN) */
103 #endif /* _KERNEL */
104
105
106 #ifdef _KERNEL
107
108 /*
109 * Type of copy for mb_{put|get}_mem()
110 */
111 #define MB_MSYSTEM 0 /* use bcopy() */
112 #define MB_MUSER 1 /* use copyin()/copyout() */
113 #define MB_MINLINE 2 /* use an inline copy loop */
114 #define MB_MZERO 3 /* bzero(), mb_put_mem only */
115 #define MB_MCUSTOM 4 /* use an user defined function */
116
117 struct mbuf;
118 struct mbchain;
119
120 typedef int mb_copy_t(struct mbchain *mbp, c_caddr_t src, caddr_t dst, size_t len);
121
122 struct mbchain {
123 struct mbuf * mb_top; /* head of mbufs chain */
124 struct mbuf * mb_cur; /* current mbuf */
125 int mb_mleft; /* free space in the current mbuf */
126 int mb_count; /* total number of bytes */
127 mb_copy_t * mb_copy; /* user defined copy function */
128 void * mb_udata; /* user data */
129 };
130
131 struct mdchain {
132 struct mbuf * md_top; /* head of mbufs chain */
133 struct mbuf * md_cur; /* current mbuf */
134 u_char * md_pos; /* offset in the current mbuf */
135 };
136
137 int mb_init(struct mbchain *mbp);
138 void mb_initm(struct mbchain *mbp, struct mbuf *m);
139 void mb_done(struct mbchain *mbp);
140 struct mbuf *mb_detach(struct mbchain *mbp);
141 int mb_fixhdr(struct mbchain *mbp);
142 caddr_t mb_reserve(struct mbchain *mbp, int size);
143
144 int mb_put_uint8(struct mbchain *mbp, u_int8_t x);
145 int mb_put_uint16be(struct mbchain *mbp, u_int16_t x);
146 int mb_put_uint16le(struct mbchain *mbp, u_int16_t x);
147 int mb_put_uint32be(struct mbchain *mbp, u_int32_t x);
148 int mb_put_uint32le(struct mbchain *mbp, u_int32_t x);
149 int mb_put_int64be(struct mbchain *mbp, int64_t x);
150 int mb_put_int64le(struct mbchain *mbp, int64_t x);
151 int mb_put_mem(struct mbchain *mbp, c_caddr_t source, int size, int type);
152 int mb_put_mbuf(struct mbchain *mbp, struct mbuf *m);
153 int mb_put_uio(struct mbchain *mbp, struct uio *uiop, int size);
154
155 int md_init(struct mdchain *mdp);
156 void md_initm(struct mdchain *mbp, struct mbuf *m);
157 void md_done(struct mdchain *mdp);
158 void md_append_record(struct mdchain *mdp, struct mbuf *top);
159 int md_next_record(struct mdchain *mdp);
160 int md_get_uint8(struct mdchain *mdp, u_int8_t *x);
161 int md_get_uint16(struct mdchain *mdp, u_int16_t *x);
162 int md_get_uint16le(struct mdchain *mdp, u_int16_t *x);
163 int md_get_uint16be(struct mdchain *mdp, u_int16_t *x);
164 int md_get_uint32(struct mdchain *mdp, u_int32_t *x);
165 int md_get_uint32be(struct mdchain *mdp, u_int32_t *x);
166 int md_get_uint32le(struct mdchain *mdp, u_int32_t *x);
167 int md_get_int64(struct mdchain *mdp, int64_t *x);
168 int md_get_int64be(struct mdchain *mdp, int64_t *x);
169 int md_get_int64le(struct mdchain *mdp, int64_t *x);
170 int md_get_mem(struct mdchain *mdp, caddr_t target, int size, int type);
171 int md_get_mbuf(struct mdchain *mdp, int size, struct mbuf **m);
172 int md_get_uio(struct mdchain *mdp, struct uio *uiop, int size);
173
174 #endif /* ifdef _KERNEL */
175
176 #endif /* !_SYS_MCHAIN_H_ */
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