1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*
* This file is part of the Green End SFTP Server.
* Copyright (C) 2007, 2011, 2014 Richard Kettlewell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/** @file putword.h @brief Macros for storing network-order values */
#ifndef PUTWORD_H
#define PUTWORD_H
#include <arpa/inet.h>
#ifndef ASM
# define ASM 1
#endif
/** @brief Unaligned 16-bit network-order store
* @param where Where to store value
* @param u Value to store
*/
static inline void put16(void *where, uint16_t u) {
#if (__i386__ || __amd64__) && __GNUC__ && ASM
__asm__ volatile("xchg %h[U],%b[U]\n\tmovw %[U],%[WHERE]"
: [U] "+Q" (u)
: [WHERE] "m" (*(uint16_t *)where));
#else
uint8_t *ptr = where;
*ptr++ = (uint8_t)(u >> 8);
*ptr = (uint8_t)u;
#endif
}
/** @brief Unaligned 32-bit network-order store
* @param where Where to store value
* @param u Value to store
*/
static inline void put32(void *where, uint32_t u) {
#if (__i386__ || __amd64__) && __GNUC__ && ASM
__asm__ volatile("bswapl %[U]\n\tmovl %[U],%[WHERE]"
: [U] "+r" (u)
: [WHERE] "m" (*(uint32_t *)where));
#else
uint8_t *ptr = where;
*ptr++ = (uint8_t)(u >> 24);
*ptr++ = (uint8_t)(u >> 16);
*ptr++ = (uint8_t)(u >> 8);
*ptr++ = (uint8_t)(u);
#endif
}
/** @brief Unaligned 64-bit network-order store
* @param where Where to store value
* @param u Value to store
*/
static inline void put64(void *where, uint64_t u) {
#if __amd64__ && __GNUC__ && ASM
__asm__ volatile("bswapq %[U]\n\tmovq %[U],%[WHERE]"
: [U] "+r" (u)
: [WHERE] "m" (*(uint64_t *)where));
#else
put32(where, u >> 32);
put32((char *)where + 4, (uint32_t)u);
#endif
}
/** @brief Unaligned 16-bit network-order fetch
* @param where Where to fetch from
* @return Fetched value
*/
static inline uint16_t get16(const void *where) {
#if (__i386__ || __amd64__) && __GNUC__ && ASM
uint16_t r;
__asm__("movw %[WHERE],%[R]\t\nxchg %h[R],%b[R]"
: [R] "=Q" (r)
: [WHERE] "m" (*(const uint16_t *)where));
return r;
#else
const uint8_t *ptr = where;
return (ptr[0] << 8) + ptr[1];
#endif
}
/** @brief Unaligned 32-bit network-order fetch
* @param where Where to fetch from
* @return Fetched value
*/
static inline uint32_t get32(const void *where) {
#if (__i386__ || __amd64__) && __GNUC__ && ASM
uint32_t r;
__asm__("movl %[WHERE],%[R]\n\tbswapl %[R]"
: [R] "=r" (r)
: [WHERE] "m" (*(const uint32_t *)where));
return r;
#else
const uint8_t *ptr = where;
return ((unsigned)ptr[0] << 24) + (ptr[1] << 16) + (ptr[2] << 8) + ptr[3];
#endif
}
/** @brief Unaligned 64-bit network-order fetch
* @param where Where to fetch from
* @return Fetched value
*/
static inline uint64_t get64(const void *where) {
#if __amd64__ && __GNUC__ && ASM
uint64_t r;
__asm__("movq %[WHERE],%[R]\n\tbswapq %[R]"
: [R] "=r" (r)
: [WHERE] "m" (*(const uint64_t *)where));
return r;
#else
return ((uint64_t)get32(where) << 32) + get32((const char *)where + 4);
#endif
}
#endif /* PUTWORD_H */
/*
Local Variables:
c-basic-offset:2
comment-column:40
fill-column:79
indent-tabs-mode:nil
End:
*/
|
