typo
[libav.git] / bswap.h
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1#ifndef __BSWAP_H__
2#define __BSWAP_H__
3
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4/* It's need for ffmpeg. Else where will be defined ARCH_X86?*/
5#include "config.h"
6
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7#ifdef HAVE_BYTESWAP_H
8#include <byteswap.h>
9#else
10
11#include <inttypes.h>
12
13#ifdef ARCH_X86
14inline static unsigned short ByteSwap16(unsigned short x)
15{
16 __asm("xchgb %b0,%h0" :
17 "=q" (x) :
18 "0" (x));
19 return x;
20}
21#define bswap_16(x) ByteSwap16(x)
22
23inline static unsigned int ByteSwap32(unsigned int x)
24{
25#if __CPU__ > 386
26 __asm("bswap %0":
27 "=r" (x) :
28#else
29 __asm("xchgb %b0,%h0\n"
30 " rorl $16,%0\n"
31 " xchgb %b0,%h0":
32 "=q" (x) :
33#endif
34 "0" (x));
35 return x;
36}
37#define bswap_32(x) ByteSwap32(x)
38
39inline static unsigned long long int ByteSwap64(unsigned long long int x)
40{
41 register union { __extension__ unsigned long long int __ll;
42 unsigned long int __l[2]; } __x;
43 asm("xchgl %0,%1":
44 "=r"(__x.__l[0]),"=r"(__x.__l[1]):
45 "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
46 return __x.__ll;
47}
48#define bswap_64(x) ByteSwap64(x)
49
50#else
51
52#define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
53
54
55// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
56#define bswap_32(x) \
57 ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
58 (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
59
60#define bswap_64(x) \
61 (__extension__ \
62 ({ union { __extension__ unsigned long long int __ll; \
63 unsigned long int __l[2]; } __w, __r; \
64 __w.__ll = (x); \
65 __r.__l[0] = bswap_32 (__w.__l[1]); \
66 __r.__l[1] = bswap_32 (__w.__l[0]); \
67 __r.__ll; }))
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
91#endif