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 * $FreeBSD$
33 */
34 #ifndef _SYS_MCHAIN_H_
35 #define _SYS_MCHAIN_H_
36
37 #include <machine/endian.h>
38
39 /*
40 * This macros probably belongs to the endian.h
41 */
42 #if (BYTE_ORDER == LITTLE_ENDIAN)
43
44 #define htoles(x) ((u_int16_t)(x))
45 #define letohs(x) ((u_int16_t)(x))
46 #define htolel(x) ((u_int32_t)(x))
47 #define letohl(x) ((u_int32_t)(x))
48 #define htoleq(x) ((int64_t)(x))
49 #define letohq(x) ((int64_t)(x))
50
51 #define htobes(x) (htons(x))
52 #define betohs(x) (ntohs(x))
53 #define htobel(x) (htonl(x))
54 #define betohl(x) (ntohl(x))
55
56 static __inline int64_t
57 htobeq(int64_t x)
58 {
59 return (int64_t)htonl((u_int32_t)(x >> 32)) |
60 (int64_t)htonl((u_int32_t)(x & 0xffffffff)) << 32;
61 }
62
63 static __inline int64_t
64 betohq(int64_t x)
65 {
66 return (int64_t)ntohl((u_int32_t)(x >> 32)) |
67 (int64_t)ntohl((u_int32_t)(x & 0xffffffff)) << 32;
68 }
69
70 #else /* (BYTE_ORDER == LITTLE_ENDIAN) */
71
72 #error "Macros for Big-Endians are incomplete"
73
74 /*
75 #define htoles(x) ((u_int16_t)(x))
76 #define letohs(x) ((u_int16_t)(x))
77 #define htolel(x) ((u_int32_t)(x))
78 #define letohl(x) ((u_int32_t)(x))
79 */
80 #endif /* (BYTE_ORDER == LITTLE_ENDIAN) */
81
82
83 #ifdef _KERNEL
84
85 /*
86 * Type of copy for mb_{put|get}_mem()
87 */
88 #define MB_MSYSTEM 0 /* use bcopy() */
89 #define MB_MUSER 1 /* use copyin()/copyout() */
90 #define MB_MINLINE 2 /* use an inline copy loop */
91 #define MB_MZERO 3 /* bzero(), mb_put_mem only */
92 #define MB_MCUSTOM 4 /* use an user defined function */
93
94 struct mbuf;
95 struct mbchain;
96
97 typedef int mb_copy_t(struct mbchain *mbp, c_caddr_t src, caddr_t dst, int len);
98
99 struct mbchain {
100 struct mbuf * mb_top; /* head of mbufs chain */
101 struct mbuf * mb_cur; /* current mbuf */
102 int mb_mleft; /* free space in the current mbuf */
103 int mb_count; /* total number of bytes */
104 mb_copy_t * mb_copy; /* user defined copy function */
105 void * mb_udata; /* user data */
106 };
107
108 struct mdchain {
109 struct mbuf * md_top; /* head of mbufs chain */
110 struct mbuf * md_cur; /* current mbuf */
111 u_char * md_pos; /* offset in the current mbuf */
112 };
113
114 int mb_init(struct mbchain *mbp);
115 void mb_initm(struct mbchain *mbp, struct mbuf *m);
116 void mb_done(struct mbchain *mbp);
117 struct mbuf *mb_detach(struct mbchain *mbp);
118 int mb_fixhdr(struct mbchain *mbp);
119 caddr_t mb_reserve(struct mbchain *mbp, int size);
120
121 int mb_put_uint8(struct mbchain *mbp, u_int8_t x);
122 int mb_put_uint16be(struct mbchain *mbp, u_int16_t x);
123 int mb_put_uint16le(struct mbchain *mbp, u_int16_t x);
124 int mb_put_uint32be(struct mbchain *mbp, u_int32_t x);
125 int mb_put_uint32le(struct mbchain *mbp, u_int32_t x);
126 int mb_put_int64be(struct mbchain *mbp, int64_t x);
127 int mb_put_int64le(struct mbchain *mbp, int64_t x);
128 int mb_put_mem(struct mbchain *mbp, c_caddr_t source, int size, int type);
129 int mb_put_mbuf(struct mbchain *mbp, struct mbuf *m);
130 int mb_put_uio(struct mbchain *mbp, struct uio *uiop, int size);
131
132 int md_init(struct mdchain *mdp);
133 void md_initm(struct mdchain *mbp, struct mbuf *m);
134 void md_done(struct mdchain *mdp);
135 void md_append_record(struct mdchain *mdp, struct mbuf *top);
136 int md_next_record(struct mdchain *mdp);
137 int md_get_uint8(struct mdchain *mdp, u_int8_t *x);
138 int md_get_uint16(struct mdchain *mdp, u_int16_t *x);
139 int md_get_uint16le(struct mdchain *mdp, u_int16_t *x);
140 int md_get_uint16be(struct mdchain *mdp, u_int16_t *x);
141 int md_get_uint32(struct mdchain *mdp, u_int32_t *x);
142 int md_get_uint32be(struct mdchain *mdp, u_int32_t *x);
143 int md_get_uint32le(struct mdchain *mdp, u_int32_t *x);
144 int md_get_int64(struct mdchain *mdp, int64_t *x);
145 int md_get_int64be(struct mdchain *mdp, int64_t *x);
146 int md_get_int64le(struct mdchain *mdp, int64_t *x);
147 int md_get_mem(struct mdchain *mdp, caddr_t target, int size, int type);
148 int md_get_mbuf(struct mdchain *mdp, int size, struct mbuf **m);
149 int md_get_uio(struct mdchain *mdp, struct uio *uiop, int size);
150
151 #endif /* ifdef _KERNEL */
152
153 #endif /* !_SYS_MCHAIN_H_ */
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