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[libav.git] / libavutil / intreadwrite.h
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1#ifndef INTREADWRITE_H
2#define INTREADWRITE_H
3
4#ifdef __GNUC__
5
6struct unaligned_64 { uint64_t l; } __attribute__((packed));
7struct unaligned_32 { uint32_t l; } __attribute__((packed));
8struct unaligned_16 { uint16_t l; } __attribute__((packed));
9
10#define LD16(a) (((const struct unaligned_16 *) (a))->l)
11#define LD32(a) (((const struct unaligned_32 *) (a))->l)
12#define LD64(a) (((const struct unaligned_64 *) (a))->l)
13
14#define ST16(a, b) (((struct unaligned_16 *) (a))->l) = (b)
15#define ST32(a, b) (((struct unaligned_32 *) (a))->l) = (b)
16
17#else /* __GNUC__ */
18
19#define LD16(a) (*((uint16_t*)(a)))
20#define LD32(a) (*((uint32_t*)(a)))
21#define LD64(a) (*((uint64_t*)(a)))
22
23#define ST16(a, b) *((uint16_t*)(a)) = (b)
24#define ST32(a, b) *((uint32_t*)(a)) = (b)
25
26#endif /* !__GNUC__ */
27
28/* endian macros */
a3550abd 29#define AV_RB8(x) (((uint8_t*)(x))[0])
7d4495da 30#define AV_WB8(p, d) { ((uint8_t*)(p))[0] = (d); }
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31
32#define AV_RB16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
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33#define AV_WB16(p, d) { \
34 ((uint8_t*)(p))[1] = (d); \
35 ((uint8_t*)(p))[0] = (d)>>8; }
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36
37#define AV_RB32(x) ((((uint8_t*)(x))[0] << 24) | \
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38 (((uint8_t*)(x))[1] << 16) | \
39 (((uint8_t*)(x))[2] << 8) | \
40 ((uint8_t*)(x))[3])
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41#define AV_WB32(p, d) { \
42 ((uint8_t*)(p))[3] = (d); \
43 ((uint8_t*)(p))[2] = (d)>>8; \
44 ((uint8_t*)(p))[1] = (d)>>16; \
45 ((uint8_t*)(p))[0] = (d)>>24; }
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46
47#define AV_RL8(x) AV_RB8(x)
7d4495da 48#define AV_WL8(p, d) AV_WB8(p, d)
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49
50#define AV_RL16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
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51#define AV_WL16(p, d) { \
52 ((uint8_t*)(p))[0] = (d); \
53 ((uint8_t*)(p))[1] = (d)>>8; }
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54
55#define AV_RL32(x) ((((uint8_t*)(x))[3] << 24) | \
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56 (((uint8_t*)(x))[2] << 16) | \
57 (((uint8_t*)(x))[1] << 8) | \
58 ((uint8_t*)(x))[0])
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59#define AV_WL32(p, d) { \
60 ((uint8_t*)(p))[0] = (d); \
61 ((uint8_t*)(p))[1] = (d)>>8; \
62 ((uint8_t*)(p))[2] = (d)>>16; \
63 ((uint8_t*)(p))[3] = (d)>>24; }
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64
65#endif /* INTREADWRITE_H */