/
physfs_byteorder.c
137 lines (121 loc) · 4.9 KB
1
2
3
4
5
/**
* PhysicsFS; a portable, flexible file i/o abstraction.
*
* Documentation is in physfs.h. It's verbose, honest. :)
*
6
* Please see the file LICENSE.txt in the source's root directory.
7
8
9
10
*
* This file written by Ryan C. Gordon.
*/
11
12
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
13
14
#ifndef PHYSFS_Swap16
15
static inline PHYSFS_uint16 PHYSFS_Swap16(PHYSFS_uint16 D)
16
{
17
return ((D<<8)|(D>>8));
18
19
20
}
#endif
#ifndef PHYSFS_Swap32
21
static inline PHYSFS_uint32 PHYSFS_Swap32(PHYSFS_uint32 D)
22
{
23
return ((D<<24)|((D<<8)&0x00FF0000)|((D>>8)&0x0000FF00)|(D>>24));
24
25
26
27
}
#endif
#ifndef PHYSFS_NO_64BIT_SUPPORT
#ifndef PHYSFS_Swap64
28
static inline PHYSFS_uint64 PHYSFS_Swap64(PHYSFS_uint64 val) {
29
PHYSFS_uint32 hi, lo;
30
31
32
33
34
35
36
37
/* 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);
38
return val;
39
40
41
42
43
44
45
46
}
#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.
*/
47
#define PHYSFS_Swap64(X) (X)
48
49
50
51
52
53
#endif
#endif /* PHYSFS_NO_64BIT_SUPPORT */
/* Byteswap item from the specified endianness to the native endianness */
#if PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN
54
55
56
57
58
59
60
61
62
63
64
65
66
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); }
67
#else
68
69
70
71
72
73
74
75
76
77
78
79
80
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; }
81
82
#endif
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
122
123
124
125
126
127
128
129
130
131
132
133
134
static inline int readAll(PHYSFS_File *file, void *val, const size_t len)
{
return (PHYSFS_readBytes(file, val, len) == len);
} /* readAll */
#define PHYSFS_BYTEORDER_READ(datatype, swaptype) \
int PHYSFS_read##swaptype(PHYSFS_File *file, PHYSFS_##datatype *val) { \
PHYSFS_##datatype in; \
BAIL_IF_MACRO(val == NULL, ERR_INVALID_ARGUMENT, 0); \
BAIL_IF_MACRO(!readAll(file, &in, sizeof (in)), NULL, 0); \
*val = PHYSFS_swap##swaptype(in); \
return 1; \
}
PHYSFS_BYTEORDER_READ(sint16, SLE16)
PHYSFS_BYTEORDER_READ(uint16, ULE16)
PHYSFS_BYTEORDER_READ(sint16, SBE16)
PHYSFS_BYTEORDER_READ(uint16, UBE16)
PHYSFS_BYTEORDER_READ(sint32, SLE32)
PHYSFS_BYTEORDER_READ(uint32, ULE32)
PHYSFS_BYTEORDER_READ(sint32, SBE32)
PHYSFS_BYTEORDER_READ(uint32, UBE32)
PHYSFS_BYTEORDER_READ(sint64, SLE64)
PHYSFS_BYTEORDER_READ(uint64, ULE64)
PHYSFS_BYTEORDER_READ(sint64, SBE64)
PHYSFS_BYTEORDER_READ(uint64, UBE64)
static inline int writeAll(PHYSFS_File *f, const void *val, const size_t len)
{
return (PHYSFS_writeBytes(f, val, len) == len);
} /* writeAll */
#define PHYSFS_BYTEORDER_WRITE(datatype, swaptype) \
int PHYSFS_write##swaptype(PHYSFS_File *file, PHYSFS_##datatype val) { \
const PHYSFS_##datatype out = PHYSFS_swap##swaptype(val); \
BAIL_IF_MACRO(!writeAll(file, &out, sizeof (out)), NULL, 0); \
return 1; \
}
PHYSFS_BYTEORDER_WRITE(sint16, SLE16)
PHYSFS_BYTEORDER_WRITE(uint16, ULE16)
PHYSFS_BYTEORDER_WRITE(sint16, SBE16)
PHYSFS_BYTEORDER_WRITE(uint16, UBE16)
PHYSFS_BYTEORDER_WRITE(sint32, SLE32)
PHYSFS_BYTEORDER_WRITE(uint32, ULE32)
PHYSFS_BYTEORDER_WRITE(sint32, SBE32)
PHYSFS_BYTEORDER_WRITE(uint32, UBE32)
PHYSFS_BYTEORDER_WRITE(sint64, SLE64)
PHYSFS_BYTEORDER_WRITE(uint64, ULE64)
PHYSFS_BYTEORDER_WRITE(sint64, SBE64)
PHYSFS_BYTEORDER_WRITE(uint64, UBE64)
135
136
/* end of physfs_byteorder.c ... */