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1 | #ifndef __BSWAP_H__ |
2 | #define __BSWAP_H__ | |
3 | ||
4 | #ifdef HAVE_CONFIG_H | |
5 | #include "config.h" | |
6 | #endif | |
7 | ||
8 | #ifdef HAVE_BYTESWAP_H | |
9 | #include <byteswap.h> | |
10 | #else | |
11 | ||
12 | #include <inttypes.h> | |
13 | ||
14 | #ifdef ARCH_X86 | |
15 | inline static unsigned short ByteSwap16(unsigned short x) | |
16 | { | |
17 | __asm("xchgb %b0,%h0" : | |
18 | "=q" (x) : | |
19 | "0" (x)); | |
20 | return x; | |
21 | } | |
22 | #define bswap_16(x) ByteSwap16(x) | |
23 | ||
24 | inline static unsigned int ByteSwap32(unsigned int x) | |
25 | { | |
26 | #if __CPU__ > 386 | |
27 | __asm("bswap %0": | |
28 | "=r" (x) : | |
29 | #else | |
30 | __asm("xchgb %b0,%h0\n" | |
31 | " rorl $16,%0\n" | |
32 | " xchgb %b0,%h0": | |
33 | "=q" (x) : | |
34 | #endif | |
35 | "0" (x)); | |
36 | return x; | |
37 | } | |
38 | #define bswap_32(x) ByteSwap32(x) | |
39 | ||
40 | inline static unsigned long long int ByteSwap64(unsigned long long int x) | |
41 | { | |
42 | register union { __extension__ unsigned long long int __ll; | |
43 | unsigned long int __l[2]; } __x; | |
44 | asm("xchgl %0,%1": | |
45 | "=r"(__x.__l[0]),"=r"(__x.__l[1]): | |
46 | "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32)))); | |
47 | return __x.__ll; | |
48 | } | |
49 | #define bswap_64(x) ByteSwap64(x) | |
50 | ||
51 | #else | |
52 | ||
53 | #define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8) | |
54 | ||
55 | ||
56 | // code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc. | |
57 | #define bswap_32(x) \ | |
58 | ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \ | |
59 | (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) | |
60 | ||
61 | #define bswap_64(x) \ | |
62 | (__extension__ \ | |
63 | ({ union { __extension__ unsigned long long int __ll; \ | |
64 | unsigned long int __l[2]; } __w, __r; \ | |
65 | __w.__ll = (x); \ | |
66 | __r.__l[0] = bswap_32 (__w.__l[1]); \ | |
67 | __r.__l[1] = bswap_32 (__w.__l[0]); \ | |
68 | __r.__ll; })) | |
69 | #endif /* !ARCH_X86 */ | |
70 | ||
71 | #endif /* !HAVE_BYTESWAP_H */ | |
72 | ||
73 | // be2me ... BigEndian to MachineEndian | |
74 | // le2me ... LittleEndian to MachineEndian | |
75 | ||
76 | #ifdef WORDS_BIGENDIAN | |
77 | #define be2me_16(x) (x) | |
78 | #define be2me_32(x) (x) | |
79 | #define be2me_64(x) (x) | |
80 | #define le2me_16(x) bswap_16(x) | |
81 | #define le2me_32(x) bswap_32(x) | |
82 | #define le2me_64(x) bswap_64(x) | |
83 | #else | |
84 | #define be2me_16(x) bswap_16(x) | |
85 | #define be2me_32(x) bswap_32(x) | |
86 | #define be2me_64(x) bswap_64(x) | |
87 | #define le2me_16(x) (x) | |
88 | #define le2me_32(x) (x) | |
89 | #define le2me_64(x) (x) | |
90 | #endif | |
91 | ||
92 | #endif |