Use sign_extend function instead of reimplementing it.
[libav.git] / libavutil / intreadwrite.h
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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
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19#ifndef AVUTIL_INTREADWRITE_H
20#define AVUTIL_INTREADWRITE_H
cf1e119b 21
99545457 22#include <stdint.h>
a087028a 23#include "config.h"
c08be350 24#include "bswap.h"
99545457 25
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26#ifdef __GNUC__
27
28struct unaligned_64 { uint64_t l; } __attribute__((packed));
29struct unaligned_32 { uint32_t l; } __attribute__((packed));
30struct unaligned_16 { uint16_t l; } __attribute__((packed));
31
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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)
cf1e119b 35
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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)
cf1e119b 39
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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
cf1e119b 51
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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)))
cf1e119b 55
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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)
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59
60#endif /* !__GNUC__ */
61
62/* endian macros */
ff794171 63#define AV_RB8(x) (((const uint8_t*)(x))[0])
803ca89c 64#define AV_WB8(p, d) do { ((uint8_t*)(p))[0] = (d); } while(0)
a3550abd 65
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66#define AV_RL8(x) AV_RB8(x)
67#define AV_WL8(p, d) AV_WB8(p, d)
68
b250f9c6 69#if HAVE_FAST_UNALIGNED
7b829d2a 70# ifdef WORDS_BIGENDIAN
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71# define AV_RB16(x) AV_RN16(x)
72# define AV_WB16(p, d) AV_WN16(p, d)
7b829d2a 73
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74# define AV_RL16(x) bswap_16(AV_RN16(x))
75# define AV_WL16(p, d) AV_WN16(p, bswap_16(d))
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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))
7b829d2a 88# else /* WORDS_BIGENDIAN */
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89# define AV_RB16(x) bswap_16(AV_RN16(x))
90# define AV_WB16(p, d) AV_WN16(p, bswap_16(d))
7b829d2a 91
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92# define AV_RL16(x) AV_RN16(x)
93# define AV_WL16(p, d) AV_WN16(p, d)
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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)
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106# endif
107#else /* HAVE_FAST_UNALIGNED */
ff794171 108#define AV_RB16(x) ((((const uint8_t*)(x))[0] << 8) | ((const uint8_t*)(x))[1])
803ca89c 109#define AV_WB16(p, d) do { \
7d4495da 110 ((uint8_t*)(p))[1] = (d); \
803ca89c 111 ((uint8_t*)(p))[0] = (d)>>8; } while(0)
a3550abd 112
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113#define AV_RL16(x) ((((const uint8_t*)(x))[1] << 8) | \
114 ((const uint8_t*)(x))[0])
803ca89c 115#define AV_WL16(p, d) do { \
85b1a722 116 ((uint8_t*)(p))[0] = (d); \
803ca89c 117 ((uint8_t*)(p))[1] = (d)>>8; } while(0)
7b829d2a 118
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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])
803ca89c 123#define AV_WB32(p, d) do { \
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124 ((uint8_t*)(p))[3] = (d); \
125 ((uint8_t*)(p))[2] = (d)>>8; \
126 ((uint8_t*)(p))[1] = (d)>>16; \
803ca89c 127 ((uint8_t*)(p))[0] = (d)>>24; } while(0)
a3550abd 128
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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])
803ca89c 133#define AV_WL32(p, d) do { \
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134 ((uint8_t*)(p))[0] = (d); \
135 ((uint8_t*)(p))[1] = (d)>>8; \
136 ((uint8_t*)(p))[2] = (d)>>16; \
803ca89c 137 ((uint8_t*)(p))[3] = (d)>>24; } while(0)
9e010b41 138
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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])
803ca89c 147#define AV_WB64(p, d) do { \
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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; \
803ca89c 155 ((uint8_t*)(p))[0] = (d)>>56; } while(0)
9e010b41 156
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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])
803ca89c 165#define AV_WL64(p, d) do { \
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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; \
803ca89c 173 ((uint8_t*)(p))[7] = (d)>>56; } while(0)
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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)
9e010b41 191
98790382 192#endif /* AVUTIL_INTREADWRITE_H */