/
physfs_byteorder.c
122 lines (107 loc) · 3.99 KB
1
2
3
4
5
6
7
8
9
10
/**
* PhysicsFS; a portable, flexible file i/o abstraction.
*
* Documentation is in physfs.h. It's verbose, honest. :)
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
11
12
13
14
#if HAVE_CONFIG_H
# include <config.h>
#endif
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "physfs.h"
/* This byteorder stuff was lifted from SDL. http://www.libsdl.org/ */
#define PHYSFS_LIL_ENDIAN 1234
#define PHYSFS_BIG_ENDIAN 4321
#if defined(__i386__) || defined(__ia64__) || defined(WIN32) || \
(defined(__alpha__) || defined(__alpha)) || \
defined(__arm__) || \
(defined(__mips__) && defined(__MIPSEL__)) || \
defined(__SYMBIAN32__) || \
defined(__LITTLE_ENDIAN__)
#define PHYSFS_BYTEORDER PHYSFS_LIL_ENDIAN
#else
#define PHYSFS_BYTEORDER PHYSFS_BIG_ENDIAN
#endif
/* The macros used to swap values */
/* Try to use superfast macros on systems that support them */
#ifdef linux
#include <asm/byteorder.h>
#ifdef __arch__swab16
#define PHYSFS_Swap16 __arch__swab16
#endif
#ifdef __arch__swab32
#define PHYSFS_Swap32 __arch__swab32
#endif
#endif /* linux */
47
48
49
50
51
#if (defined _MSC_VER)
#define __inline__ __inline
#endif
52
#ifndef PHYSFS_Swap16
53
static __inline__ PHYSFS_uint16 PHYSFS_Swap16(PHYSFS_uint16 D)
54
55
56
57
58
{
return((D<<8)|(D>>8));
}
#endif
#ifndef PHYSFS_Swap32
59
static __inline__ PHYSFS_uint32 PHYSFS_Swap32(PHYSFS_uint32 D)
60
61
62
63
64
65
{
return((D<<24)|((D<<8)&0x00FF0000)|((D>>8)&0x0000FF00)|(D>>24));
}
#endif
#ifndef PHYSFS_NO_64BIT_SUPPORT
#ifndef PHYSFS_Swap64
66
static __inline__ PHYSFS_uint64 PHYSFS_Swap64(PHYSFS_uint64 val) {
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
PHYSFS_uint32 hi, lo;
/* Separate into high and low 32-bit values and swap them */
lo = (PHYSFS_uint32)(val&0xFFFFFFFF);
val >>= 32;
hi = (PHYSFS_uint32)(val&0xFFFFFFFF);
val = PHYSFS_Swap32(lo);
val <<= 32;
val |= PHYSFS_Swap32(hi);
return(val);
}
#endif
#else
#ifndef PHYSFS_Swap64
/* This is mainly to keep compilers from complaining in PHYSFS code.
If there is no real 64-bit datatype, then compilers will complain about
the fake 64-bit datatype that PHYSFS provides when it compiles user code.
*/
#define PHYSFS_Swap64(X) (X)
#endif
#endif /* PHYSFS_NO_64BIT_SUPPORT */
/* Byteswap item from the specified endianness to the native endianness */
#if PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN
PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 x) { return(x); }
PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 x) { return(x); }
PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 x) { return(x); }
PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 x) { return(x); }
PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 x) { return(x); }
PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 x) { return(x); }
PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 x) { return(PHYSFS_Swap16(x)); }
PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 x) { return(PHYSFS_Swap16(x)); }
PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 x) { return(PHYSFS_Swap32(x)); }
PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 x) { return(PHYSFS_Swap32(x)); }
PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 x) { return(PHYSFS_Swap64(x)); }
PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 x) { return(PHYSFS_Swap64(x)); }
#else
PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 x) { return(PHYSFS_Swap16(x)); }
PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 x) { return(PHYSFS_Swap16(x)); }
PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 x) { return(PHYSFS_Swap32(x)); }
PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 x) { return(PHYSFS_Swap32(x)); }
PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 x) { return(PHYSFS_Swap64(x)); }
PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 x) { return(PHYSFS_Swap64(x)); }
PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 x) { return(x); }
PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 x) { return(x); }
PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 x) { return(x); }
PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 x) { return(x); }
PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 x) { return(x); }
PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 x) { return(x); }
#endif
/* end of physfs_byteorder.c ... */