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1 office 1 /**
2 * @file byteorder.h
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
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.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * @section DESCRIPTION
30 *
31 * Byte order conversion functions.
32 *
33 * hton* functions convert from host to big-endian (network) byte order.
34 * htol* functions convert from host to little-endian byte order.
35 * ntoh* functions convert from big-endian (network) to host byte order.
36 * ltoh* functions convert from little-endian to host byte order.
37 */
38  
39 #ifndef BADVPN_MISC_BYTEORDER_H
40 #define BADVPN_MISC_BYTEORDER_H
41  
42 #if (defined(BADVPN_LITTLE_ENDIAN) + defined(BADVPN_BIG_ENDIAN)) != 1
43 #error Unknown byte order or too many byte orders
44 #endif
45  
46 #include <stdint.h>
47  
48 static uint16_t badvpn_reverse16 (uint16_t x)
49 {
50 uint16_t y;
51 *((uint8_t *)&y+0) = *((uint8_t *)&x+1);
52 *((uint8_t *)&y+1) = *((uint8_t *)&x+0);
53 return y;
54 }
55  
56 static uint32_t badvpn_reverse32 (uint32_t x)
57 {
58 uint32_t y;
59 *((uint8_t *)&y+0) = *((uint8_t *)&x+3);
60 *((uint8_t *)&y+1) = *((uint8_t *)&x+2);
61 *((uint8_t *)&y+2) = *((uint8_t *)&x+1);
62 *((uint8_t *)&y+3) = *((uint8_t *)&x+0);
63 return y;
64 }
65  
66 static uint64_t badvpn_reverse64 (uint64_t x)
67 {
68 uint64_t y;
69 *((uint8_t *)&y+0) = *((uint8_t *)&x+7);
70 *((uint8_t *)&y+1) = *((uint8_t *)&x+6);
71 *((uint8_t *)&y+2) = *((uint8_t *)&x+5);
72 *((uint8_t *)&y+3) = *((uint8_t *)&x+4);
73 *((uint8_t *)&y+4) = *((uint8_t *)&x+3);
74 *((uint8_t *)&y+5) = *((uint8_t *)&x+2);
75 *((uint8_t *)&y+6) = *((uint8_t *)&x+1);
76 *((uint8_t *)&y+7) = *((uint8_t *)&x+0);
77 return y;
78 }
79  
80 static uint8_t hton8 (uint8_t x)
81 {
82 return x;
83 }
84  
85 static uint8_t htol8 (uint8_t x)
86 {
87 return x;
88 }
89  
90 #if defined(BADVPN_LITTLE_ENDIAN)
91  
92 static uint16_t hton16 (uint16_t x)
93 {
94 return badvpn_reverse16(x);
95 }
96  
97 static uint32_t hton32 (uint32_t x)
98 {
99 return badvpn_reverse32(x);
100 }
101  
102 static uint64_t hton64 (uint64_t x)
103 {
104 return badvpn_reverse64(x);
105 }
106  
107 static uint16_t htol16 (uint16_t x)
108 {
109 return x;
110 }
111  
112 static uint32_t htol32 (uint32_t x)
113 {
114 return x;
115 }
116  
117 static uint64_t htol64 (uint64_t x)
118 {
119 return x;
120 }
121  
122 #elif defined(BADVPN_BIG_ENDIAN)
123  
124 static uint16_t hton16 (uint16_t x)
125 {
126 return x;
127 }
128  
129 static uint32_t hton32 (uint32_t x)
130 {
131 return x;
132 }
133  
134 static uint64_t hton64 (uint64_t x)
135 {
136 return x;
137 }
138  
139 static uint16_t htol16 (uint16_t x)
140 {
141 return badvpn_reverse16(x);
142 }
143  
144 static uint32_t htol32 (uint32_t x)
145 {
146 return badvpn_reverse32(x);
147 }
148  
149 static uint64_t htol64 (uint64_t x)
150 {
151 return badvpn_reverse64(x);
152 }
153  
154 #endif
155  
156 static uint8_t ntoh8 (uint8_t x)
157 {
158 return hton8(x);
159 }
160  
161 static uint16_t ntoh16 (uint16_t x)
162 {
163 return hton16(x);
164 }
165  
166 static uint32_t ntoh32 (uint32_t x)
167 {
168 return hton32(x);
169 }
170  
171 static uint64_t ntoh64 (uint64_t x)
172 {
173 return hton64(x);
174 }
175  
176 static uint8_t ltoh8 (uint8_t x)
177 {
178 return htol8(x);
179 }
180  
181 static uint16_t ltoh16 (uint16_t x)
182 {
183 return htol16(x);
184 }
185  
186 static uint32_t ltoh32 (uint32_t x)
187 {
188 return htol32(x);
189 }
190  
191 static uint64_t ltoh64 (uint64_t x)
192 {
193 return htol64(x);
194 }
195  
196 #endif