Add FFMPEG_ prefix to all multiple inclusion guards.
[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 FFMPEG_INTREADWRITE_H
20 #define FFMPEG_INTREADWRITE_H
21
22 #include <stdint.h>
23 #include "bswap.h"
24
25 #ifdef __GNUC__
26
27 struct unaligned_64 { uint64_t l; } __attribute__((packed));
28 struct unaligned_32 { uint32_t l; } __attribute__((packed));
29 struct unaligned_16 { uint16_t l; } __attribute__((packed));
30
31 #define AV_RN16(a) (((const struct unaligned_16 *) (a))->l)
32 #define AV_RN32(a) (((const struct unaligned_32 *) (a))->l)
33 #define AV_RN64(a) (((const struct unaligned_64 *) (a))->l)
34
35 #define AV_WN16(a, b) (((struct unaligned_16 *) (a))->l) = (b)
36 #define AV_WN32(a, b) (((struct unaligned_32 *) (a))->l) = (b)
37 #define AV_WN64(a, b) (((struct unaligned_64 *) (a))->l) = (b)
38
39 #else /* __GNUC__ */
40
41 #define AV_RN16(a) (*((uint16_t*)(a)))
42 #define AV_RN32(a) (*((uint32_t*)(a)))
43 #define AV_RN64(a) (*((uint64_t*)(a)))
44
45 #define AV_WN16(a, b) *((uint16_t*)(a)) = (b)
46 #define AV_WN32(a, b) *((uint32_t*)(a)) = (b)
47 #define AV_WN64(a, b) *((uint64_t*)(a)) = (b)
48
49 #endif /* !__GNUC__ */
50
51 /* endian macros */
52 #define AV_RB8(x) (((uint8_t*)(x))[0])
53 #define AV_WB8(p, d) do { ((uint8_t*)(p))[0] = (d); } while(0)
54
55 #define AV_RL8(x) AV_RB8(x)
56 #define AV_WL8(p, d) AV_WB8(p, d)
57
58 #ifdef HAVE_FAST_UNALIGNED
59 # ifdef WORDS_BIGENDIAN
60 # define AV_RB16(x) AV_RN16(x)
61 # define AV_WB16(p, d) AV_WN16(p, d)
62
63 # define AV_RL16(x) bswap_16(AV_RN16(x))
64 # define AV_WL16(p, d) AV_WN16(p, bswap_16(d))
65 # else /* WORDS_BIGENDIAN */
66 # define AV_RB16(x) bswap_16(AV_RN16(x))
67 # define AV_WB16(p, d) AV_WN16(p, bswap_16(d))
68
69 # define AV_RL16(x) AV_RN16(x)
70 # define AV_WL16(p, d) AV_WN16(p, d)
71 # endif
72 #else /* HAVE_FAST_UNALIGNED */
73 #define AV_RB16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
74 #define AV_WB16(p, d) do { \
75 ((uint8_t*)(p))[1] = (d); \
76 ((uint8_t*)(p))[0] = (d)>>8; } while(0)
77
78 #define AV_RL16(x) ((((uint8_t*)(x))[1] << 8) | \
79 ((uint8_t*)(x))[0])
80 #define AV_WL16(p, d) do { \
81 ((uint8_t*)(p))[0] = (d); \
82 ((uint8_t*)(p))[1] = (d)>>8; } while(0)
83 #endif
84
85 #define AV_RB24(x) ((((uint8_t*)(x))[0] << 16) | \
86 (((uint8_t*)(x))[1] << 8) | \
87 ((uint8_t*)(x))[2])
88 #define AV_WB24(p, d) do { \
89 ((uint8_t*)(p))[2] = (d); \
90 ((uint8_t*)(p))[1] = (d)>>8; \
91 ((uint8_t*)(p))[0] = (d)>>16; } while(0)
92
93 #define AV_RL24(x) ((((uint8_t*)(x))[2] << 16) | \
94 (((uint8_t*)(x))[1] << 8) | \
95 ((uint8_t*)(x))[0])
96 #define AV_WL24(p, d) do { \
97 ((uint8_t*)(p))[0] = (d); \
98 ((uint8_t*)(p))[1] = (d)>>8; \
99 ((uint8_t*)(p))[2] = (d)>>16; } while(0)
100
101 #ifdef HAVE_FAST_UNALIGNED
102 # ifdef WORDS_BIGENDIAN
103 # define AV_RB32(x) AV_RN32(x)
104 # define AV_WB32(p, d) AV_WN32(p, d)
105
106 # define AV_RL32(x) bswap_32(AV_RN32(x))
107 # define AV_WL32(p, d) AV_WN32(p, bswap_32(d))
108 # else /* WORDS_BIGENDIAN */
109 # define AV_RB32(x) bswap_32(AV_RN32(x))
110 # define AV_WB32(p, d) AV_WN32(p, bswap_32(d))
111
112 # define AV_RL32(x) AV_RN32(x)
113 # define AV_WL32(p, d) AV_WN32(p, d)
114 # endif
115 #else /* HAVE_FAST_UNALIGNED */
116 #define AV_RB32(x) ((((uint8_t*)(x))[0] << 24) | \
117 (((uint8_t*)(x))[1] << 16) | \
118 (((uint8_t*)(x))[2] << 8) | \
119 ((uint8_t*)(x))[3])
120 #define AV_WB32(p, d) do { \
121 ((uint8_t*)(p))[3] = (d); \
122 ((uint8_t*)(p))[2] = (d)>>8; \
123 ((uint8_t*)(p))[1] = (d)>>16; \
124 ((uint8_t*)(p))[0] = (d)>>24; } while(0)
125
126 #define AV_RL32(x) ((((uint8_t*)(x))[3] << 24) | \
127 (((uint8_t*)(x))[2] << 16) | \
128 (((uint8_t*)(x))[1] << 8) | \
129 ((uint8_t*)(x))[0])
130 #define AV_WL32(p, d) do { \
131 ((uint8_t*)(p))[0] = (d); \
132 ((uint8_t*)(p))[1] = (d)>>8; \
133 ((uint8_t*)(p))[2] = (d)>>16; \
134 ((uint8_t*)(p))[3] = (d)>>24; } while(0)
135 #endif
136
137 #ifdef HAVE_FAST_UNALIGNED
138 # ifdef WORDS_BIGENDIAN
139 # define AV_RB64(x) AV_RN64(x)
140 # define AV_WB64(p, d) AV_WN64(p, d)
141
142 # define AV_RL64(x) bswap_64(AV_RN64(x))
143 # define AV_WL64(p, d) AV_WN64(p, bswap_64(d))
144 # else /* WORDS_BIGENDIAN */
145 # define AV_RB64(x) bswap_64(AV_RN64(x))
146 # define AV_WB64(p, d) AV_WN64(p, bswap_64(d))
147
148 # define AV_RL64(x) AV_RN64(x)
149 # define AV_WL64(p, d) AV_WN64(p, d)
150 # endif
151 #else /* HAVE_FAST_UNALIGNED */
152 #define AV_RB64(x) (((uint64_t)((uint8_t*)(x))[0] << 56) | \
153 ((uint64_t)((uint8_t*)(x))[1] << 48) | \
154 ((uint64_t)((uint8_t*)(x))[2] << 40) | \
155 ((uint64_t)((uint8_t*)(x))[3] << 32) | \
156 ((uint64_t)((uint8_t*)(x))[4] << 24) | \
157 ((uint64_t)((uint8_t*)(x))[5] << 16) | \
158 ((uint64_t)((uint8_t*)(x))[6] << 8) | \
159 (uint64_t)((uint8_t*)(x))[7])
160 #define AV_WB64(p, d) do { \
161 ((uint8_t*)(p))[7] = (d); \
162 ((uint8_t*)(p))[6] = (d)>>8; \
163 ((uint8_t*)(p))[5] = (d)>>16; \
164 ((uint8_t*)(p))[4] = (d)>>24; \
165 ((uint8_t*)(p))[3] = (d)>>32; \
166 ((uint8_t*)(p))[2] = (d)>>40; \
167 ((uint8_t*)(p))[1] = (d)>>48; \
168 ((uint8_t*)(p))[0] = (d)>>56; } while(0)
169
170 #define AV_RL64(x) (((uint64_t)((uint8_t*)(x))[7] << 56) | \
171 ((uint64_t)((uint8_t*)(x))[6] << 48) | \
172 ((uint64_t)((uint8_t*)(x))[5] << 40) | \
173 ((uint64_t)((uint8_t*)(x))[4] << 32) | \
174 ((uint64_t)((uint8_t*)(x))[3] << 24) | \
175 ((uint64_t)((uint8_t*)(x))[2] << 16) | \
176 ((uint64_t)((uint8_t*)(x))[1] << 8) | \
177 (uint64_t)((uint8_t*)(x))[0])
178 #define AV_WL64(p, d) do { \
179 ((uint8_t*)(p))[0] = (d); \
180 ((uint8_t*)(p))[1] = (d)>>8; \
181 ((uint8_t*)(p))[2] = (d)>>16; \
182 ((uint8_t*)(p))[3] = (d)>>24; \
183 ((uint8_t*)(p))[4] = (d)>>32; \
184 ((uint8_t*)(p))[5] = (d)>>40; \
185 ((uint8_t*)(p))[6] = (d)>>48; \
186 ((uint8_t*)(p))[7] = (d)>>56; } while(0)
187 #endif
188
189 #endif /* FFMPEG_INTREADWRITE_H */