Globally rename the header inclusion guard names.
[libav.git] / libavutil / intreadwrite.h
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #ifndef AVUTIL_INTREADWRITE_H
20 #define AVUTIL_INTREADWRITE_H
21
22 #include <stdint.h>
23 #include "config.h"
24 #include "bswap.h"
25
26 #ifdef __GNUC__
27
28 struct unaligned_64 { uint64_t l; } __attribute__((packed));
29 struct unaligned_32 { uint32_t l; } __attribute__((packed));
30 struct unaligned_16 { uint16_t l; } __attribute__((packed));
31
32 #define AV_RN16(a) (((const struct unaligned_16 *) (a))->l)
33 #define AV_RN32(a) (((const struct unaligned_32 *) (a))->l)
34 #define AV_RN64(a) (((const struct unaligned_64 *) (a))->l)
35
36 #define AV_WN16(a, b) (((struct unaligned_16 *) (a))->l) = (b)
37 #define AV_WN32(a, b) (((struct unaligned_32 *) (a))->l) = (b)
38 #define AV_WN64(a, b) (((struct unaligned_64 *) (a))->l) = (b)
39
40 #elif defined(__DECC)
41
42 #define AV_RN16(a) (*((const __unaligned uint16_t*)(a)))
43 #define AV_RN32(a) (*((const __unaligned uint32_t*)(a)))
44 #define AV_RN64(a) (*((const __unaligned uint64_t*)(a)))
45
46 #define AV_WN16(a, b) *((__unaligned uint16_t*)(a)) = (b)
47 #define AV_WN32(a, b) *((__unaligned uint32_t*)(a)) = (b)
48 #define AV_WN64(a, b) *((__unaligned uint64_t*)(a)) = (b)
49
50 #else
51
52 #define AV_RN16(a) (*((const uint16_t*)(a)))
53 #define AV_RN32(a) (*((const uint32_t*)(a)))
54 #define AV_RN64(a) (*((const uint64_t*)(a)))
55
56 #define AV_WN16(a, b) *((uint16_t*)(a)) = (b)
57 #define AV_WN32(a, b) *((uint32_t*)(a)) = (b)
58 #define AV_WN64(a, b) *((uint64_t*)(a)) = (b)
59
60 #endif /* !__GNUC__ */
61
62 /* endian macros */
63 #define AV_RB8(x) (((const uint8_t*)(x))[0])
64 #define AV_WB8(p, d) do { ((uint8_t*)(p))[0] = (d); } while(0)
65
66 #define AV_RL8(x) AV_RB8(x)
67 #define AV_WL8(p, d) AV_WB8(p, d)
68
69 #ifdef HAVE_FAST_UNALIGNED
70 # ifdef WORDS_BIGENDIAN
71 # define AV_RB16(x) AV_RN16(x)
72 # define AV_WB16(p, d) AV_WN16(p, d)
73
74 # define AV_RL16(x) bswap_16(AV_RN16(x))
75 # define AV_WL16(p, d) AV_WN16(p, bswap_16(d))
76
77 # define AV_RB32(x) AV_RN32(x)
78 # define AV_WB32(p, d) AV_WN32(p, d)
79
80 # define AV_RL32(x) bswap_32(AV_RN32(x))
81 # define AV_WL32(p, d) AV_WN32(p, bswap_32(d))
82
83 # define AV_RB64(x) AV_RN64(x)
84 # define AV_WB64(p, d) AV_WN64(p, d)
85
86 # define AV_RL64(x) bswap_64(AV_RN64(x))
87 # define AV_WL64(p, d) AV_WN64(p, bswap_64(d))
88 # else /* WORDS_BIGENDIAN */
89 # define AV_RB16(x) bswap_16(AV_RN16(x))
90 # define AV_WB16(p, d) AV_WN16(p, bswap_16(d))
91
92 # define AV_RL16(x) AV_RN16(x)
93 # define AV_WL16(p, d) AV_WN16(p, d)
94
95 # define AV_RB32(x) bswap_32(AV_RN32(x))
96 # define AV_WB32(p, d) AV_WN32(p, bswap_32(d))
97
98 # define AV_RL32(x) AV_RN32(x)
99 # define AV_WL32(p, d) AV_WN32(p, d)
100
101 # define AV_RB64(x) bswap_64(AV_RN64(x))
102 # define AV_WB64(p, d) AV_WN64(p, bswap_64(d))
103
104 # define AV_RL64(x) AV_RN64(x)
105 # define AV_WL64(p, d) AV_WN64(p, d)
106 # endif
107 #else /* HAVE_FAST_UNALIGNED */
108 #define AV_RB16(x) ((((const uint8_t*)(x))[0] << 8) | ((const uint8_t*)(x))[1])
109 #define AV_WB16(p, d) do { \
110 ((uint8_t*)(p))[1] = (d); \
111 ((uint8_t*)(p))[0] = (d)>>8; } while(0)
112
113 #define AV_RL16(x) ((((const uint8_t*)(x))[1] << 8) | \
114 ((const uint8_t*)(x))[0])
115 #define AV_WL16(p, d) do { \
116 ((uint8_t*)(p))[0] = (d); \
117 ((uint8_t*)(p))[1] = (d)>>8; } while(0)
118
119 #define AV_RB32(x) ((((const uint8_t*)(x))[0] << 24) | \
120 (((const uint8_t*)(x))[1] << 16) | \
121 (((const uint8_t*)(x))[2] << 8) | \
122 ((const uint8_t*)(x))[3])
123 #define AV_WB32(p, d) do { \
124 ((uint8_t*)(p))[3] = (d); \
125 ((uint8_t*)(p))[2] = (d)>>8; \
126 ((uint8_t*)(p))[1] = (d)>>16; \
127 ((uint8_t*)(p))[0] = (d)>>24; } while(0)
128
129 #define AV_RL32(x) ((((const uint8_t*)(x))[3] << 24) | \
130 (((const uint8_t*)(x))[2] << 16) | \
131 (((const uint8_t*)(x))[1] << 8) | \
132 ((const uint8_t*)(x))[0])
133 #define AV_WL32(p, d) do { \
134 ((uint8_t*)(p))[0] = (d); \
135 ((uint8_t*)(p))[1] = (d)>>8; \
136 ((uint8_t*)(p))[2] = (d)>>16; \
137 ((uint8_t*)(p))[3] = (d)>>24; } while(0)
138
139 #define AV_RB64(x) (((uint64_t)((const uint8_t*)(x))[0] << 56) | \
140 ((uint64_t)((const uint8_t*)(x))[1] << 48) | \
141 ((uint64_t)((const uint8_t*)(x))[2] << 40) | \
142 ((uint64_t)((const uint8_t*)(x))[3] << 32) | \
143 ((uint64_t)((const uint8_t*)(x))[4] << 24) | \
144 ((uint64_t)((const uint8_t*)(x))[5] << 16) | \
145 ((uint64_t)((const uint8_t*)(x))[6] << 8) | \
146 (uint64_t)((const uint8_t*)(x))[7])
147 #define AV_WB64(p, d) do { \
148 ((uint8_t*)(p))[7] = (d); \
149 ((uint8_t*)(p))[6] = (d)>>8; \
150 ((uint8_t*)(p))[5] = (d)>>16; \
151 ((uint8_t*)(p))[4] = (d)>>24; \
152 ((uint8_t*)(p))[3] = (d)>>32; \
153 ((uint8_t*)(p))[2] = (d)>>40; \
154 ((uint8_t*)(p))[1] = (d)>>48; \
155 ((uint8_t*)(p))[0] = (d)>>56; } while(0)
156
157 #define AV_RL64(x) (((uint64_t)((const uint8_t*)(x))[7] << 56) | \
158 ((uint64_t)((const uint8_t*)(x))[6] << 48) | \
159 ((uint64_t)((const uint8_t*)(x))[5] << 40) | \
160 ((uint64_t)((const uint8_t*)(x))[4] << 32) | \
161 ((uint64_t)((const uint8_t*)(x))[3] << 24) | \
162 ((uint64_t)((const uint8_t*)(x))[2] << 16) | \
163 ((uint64_t)((const uint8_t*)(x))[1] << 8) | \
164 (uint64_t)((const uint8_t*)(x))[0])
165 #define AV_WL64(p, d) do { \
166 ((uint8_t*)(p))[0] = (d); \
167 ((uint8_t*)(p))[1] = (d)>>8; \
168 ((uint8_t*)(p))[2] = (d)>>16; \
169 ((uint8_t*)(p))[3] = (d)>>24; \
170 ((uint8_t*)(p))[4] = (d)>>32; \
171 ((uint8_t*)(p))[5] = (d)>>40; \
172 ((uint8_t*)(p))[6] = (d)>>48; \
173 ((uint8_t*)(p))[7] = (d)>>56; } while(0)
174 #endif /* HAVE_FAST_UNALIGNED */
175
176 #define AV_RB24(x) ((((const uint8_t*)(x))[0] << 16) | \
177 (((const uint8_t*)(x))[1] << 8) | \
178 ((const uint8_t*)(x))[2])
179 #define AV_WB24(p, d) do { \
180 ((uint8_t*)(p))[2] = (d); \
181 ((uint8_t*)(p))[1] = (d)>>8; \
182 ((uint8_t*)(p))[0] = (d)>>16; } while(0)
183
184 #define AV_RL24(x) ((((const uint8_t*)(x))[2] << 16) | \
185 (((const uint8_t*)(x))[1] << 8) | \
186 ((const uint8_t*)(x))[0])
187 #define AV_WL24(p, d) do { \
188 ((uint8_t*)(p))[0] = (d); \
189 ((uint8_t*)(p))[1] = (d)>>8; \
190 ((uint8_t*)(p))[2] = (d)>>16; } while(0)
191
192 #endif /* AVUTIL_INTREADWRITE_H */