Statistics
| Branch: | Revision:

ffmpeg / bswap.h @ a12e4610

History | View | Annotate | Download (2.06 KB)

1
#ifndef __BSWAP_H__
2
#define __BSWAP_H__
3

    
4
#ifdef HAVE_BYTESWAP_H
5
#include <byteswap.h>
6
#else
7

    
8
#include <inttypes.h>
9

    
10
#ifdef ARCH_X86
11
inline static unsigned short ByteSwap16(unsigned short x)
12
{
13
  __asm("xchgb %b0,%h0"        :
14
        "=q" (x)        :
15
        "0" (x));
16
    return x;
17
}
18
#define bswap_16(x) ByteSwap16(x)
19

    
20
inline static unsigned int ByteSwap32(unsigned int x)
21
{
22
#if __CPU__ > 386
23
 __asm("bswap        %0":
24
      "=r" (x)     :
25
#else
26
 __asm("xchgb        %b0,%h0\n"
27
      "        rorl        $16,%0\n"
28
      "        xchgb        %b0,%h0":
29
      "=q" (x)                :
30
#endif
31
      "0" (x));
32
  return x;
33
}
34
#define bswap_32(x) ByteSwap32(x)
35

    
36
inline static unsigned long long int ByteSwap64(unsigned long long int x)
37
{
38
  register union { __extension__ unsigned long long int __ll;
39
          unsigned long int __l[2]; } __x;
40
  asm("xchgl        %0,%1":
41
      "=r"(__x.__l[0]),"=r"(__x.__l[1]):
42
      "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
43
  return __x.__ll;
44
}
45
#define bswap_64(x) ByteSwap64(x)
46

    
47
#else
48

    
49
#define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
50
                        
51

    
52
// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
53
#define bswap_32(x) \
54
     ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | \
55
      (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
56

    
57
#define bswap_64(x) \
58
     (__extension__                                                \
59
      ({ union { __extension__ unsigned long long int __ll;        \
60
                 unsigned long int __l[2]; } __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
         __r.__ll; }))
65
#endif        /* !ARCH_X86 */
66

    
67
#endif        /* !HAVE_BYTESWAP_H */
68

    
69
// be2me ... BigEndian to MachineEndian
70
// le2me ... LittleEndian to MachineEndian
71

    
72
#ifdef WORDS_BIGENDIAN
73
#define be2me_16(x) (x)
74
#define be2me_32(x) (x)
75
#define be2me_64(x) (x)
76
#define le2me_16(x) bswap_16(x)
77
#define le2me_32(x) bswap_32(x)
78
#define le2me_64(x) bswap_64(x)
79
#else
80
#define be2me_16(x) bswap_16(x)
81
#define be2me_32(x) bswap_32(x)
82
#define be2me_64(x) bswap_64(x)
83
#define le2me_16(x) (x)
84
#define le2me_32(x) (x)
85
#define le2me_64(x) (x)
86
#endif
87

    
88
#endif