cf1e119bb2
optimization/cleanup would be desirable (e.g. LE_* and LD* should be the same on x86). Originally committed as revision 7218 to svn://svn.ffmpeg.org/ffmpeg/trunk
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
#ifndef INTREADWRITE_H
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#define INTREADWRITE_H
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#ifdef __GNUC__
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struct unaligned_64 { uint64_t l; } __attribute__((packed));
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struct unaligned_32 { uint32_t l; } __attribute__((packed));
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struct unaligned_16 { uint16_t l; } __attribute__((packed));
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#define LD16(a) (((const struct unaligned_16 *) (a))->l)
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#define LD32(a) (((const struct unaligned_32 *) (a))->l)
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#define LD64(a) (((const struct unaligned_64 *) (a))->l)
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#define ST16(a, b) (((struct unaligned_16 *) (a))->l) = (b)
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#define ST32(a, b) (((struct unaligned_32 *) (a))->l) = (b)
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#else /* __GNUC__ */
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#define LD16(a) (*((uint16_t*)(a)))
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#define LD32(a) (*((uint32_t*)(a)))
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#define LD64(a) (*((uint64_t*)(a)))
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#define ST16(a, b) *((uint16_t*)(a)) = (b)
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#define ST32(a, b) *((uint32_t*)(a)) = (b)
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#endif /* !__GNUC__ */
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/* endian macros */
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#if !defined(BE_16) || !defined(BE_32) || !defined(LE_16) || !defined(LE_32)
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#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
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#define BE_32(x) ((((uint8_t*)(x))[0] << 24) | \
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(((uint8_t*)(x))[1] << 16) | \
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(((uint8_t*)(x))[2] << 8) | \
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((uint8_t*)(x))[3])
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#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
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#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
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(((uint8_t*)(x))[2] << 16) | \
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(((uint8_t*)(x))[1] << 8) | \
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((uint8_t*)(x))[0])
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#endif
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#endif /* INTREADWRITE_H */
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