don't use inttypes.h - use inline function for bswap_64()
[libav.git] / libavcodec / bswap.h
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1#ifndef __BSWAP_H__
2#define __BSWAP_H__
3
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4#ifdef HAVE_BYTESWAP_H
5#include <byteswap.h>
6#else
7
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8#ifdef ARCH_X86
9inline static unsigned short ByteSwap16(unsigned short x)
10{
11 __asm("xchgb %b0,%h0" :
12 "=q" (x) :
13 "0" (x));
14 return x;
15}
16#define bswap_16(x) ByteSwap16(x)
17
18inline static unsigned int ByteSwap32(unsigned int x)
19{
20#if __CPU__ > 386
21 __asm("bswap %0":
22 "=r" (x) :
23#else
24 __asm("xchgb %b0,%h0\n"
25 " rorl $16,%0\n"
26 " xchgb %b0,%h0":
27 "=q" (x) :
28#endif
29 "0" (x));
30 return x;
31}
32#define bswap_32(x) ByteSwap32(x)
33
34inline static unsigned long long int ByteSwap64(unsigned long long int x)
35{
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36 register union { __extension__ uint64_t __ll;
37 uint32_t __l[2]; } __x;
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38 asm("xchgl %0,%1":
39 "=r"(__x.__l[0]),"=r"(__x.__l[1]):
40 "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
41 return __x.__ll;
42}
43#define bswap_64(x) ByteSwap64(x)
44
45#else
46
47#define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
48
49
50// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
51#define bswap_32(x) \
52 ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
53 (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
54
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55inline static uint64_t ByteSwap64(uint64_t x)
56{
57 union {
58 uint64_t ll;
59 uint32_t l[2];
60 } w, r;
61 w.ll = x;
62 r.l[0] = bswap_32 (w.l[1]);
63 r.l[1] = bswap_32 (w.l[0]);
64 return r.ll;
65}
66#define bswap_64(x) ByteSwap64(x)
67
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68#endif /* !ARCH_X86 */
69
70#endif /* !HAVE_BYTESWAP_H */
71
72// be2me ... BigEndian to MachineEndian
73// le2me ... LittleEndian to MachineEndian
74
75#ifdef WORDS_BIGENDIAN
76#define be2me_16(x) (x)
77#define be2me_32(x) (x)
78#define be2me_64(x) (x)
79#define le2me_16(x) bswap_16(x)
80#define le2me_32(x) bswap_32(x)
81#define le2me_64(x) bswap_64(x)
82#else
83#define be2me_16(x) bswap_16(x)
84#define be2me_32(x) bswap_32(x)
85#define be2me_64(x) bswap_64(x)
86#define le2me_16(x) (x)
87#define le2me_32(x) (x)
88#define le2me_64(x) (x)
89#endif
90
b17c92d1 91#endif /* __BSWAP_H__ */