Commit | Line | Data |
---|---|---|
0f78b815 WD |
1 | /* |
2 | * Simple byteorder handling. | |
3 | * | |
4 | * Copyright (C) 1992-1995 Andrew Tridgell | |
d3d07a5e | 5 | * Copyright (C) 2007-2008 Wayne Davison |
0f78b815 WD |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8e41b68e WD |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 3 of the License, or | |
10 | * (at your option) any later version. | |
0f78b815 WD |
11 | * |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
e7c67065 | 17 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 18 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 | 19 | */ |
c627d613 AT |
20 | |
21 | #undef CAREFUL_ALIGNMENT | |
df6350a8 | 22 | #undef AVOID_BYTEORDER_INLINE |
c627d613 | 23 | |
36e6594d WD |
24 | /* We know that the x86 can handle misalignment and has the same |
25 | * byte order (LSB-first) as the 32-bit numbers we transmit. */ | |
c627d613 AT |
26 | #ifdef __i386__ |
27 | #define CAREFUL_ALIGNMENT 0 | |
28 | #endif | |
29 | ||
30 | #ifndef CAREFUL_ALIGNMENT | |
31 | #define CAREFUL_ALIGNMENT 1 | |
32 | #endif | |
33 | ||
34 | #define CVAL(buf,pos) (((unsigned char *)(buf))[pos]) | |
36e6594d | 35 | #define UVAL(buf,pos) ((uint32)CVAL(buf,pos)) |
c627d613 | 36 | |
c627d613 | 37 | #if CAREFUL_ALIGNMENT |
df6350a8 | 38 | |
36e6594d WD |
39 | #define PVAL(buf,pos) (UVAL(buf,pos)|UVAL(buf,(pos)+1)<<8) |
40 | #define IVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+2)<<16) | |
c627d613 AT |
41 | #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8) |
42 | #define SIVALX(buf,pos,val) (SSVALX(buf,pos,val&0xFFFF),SSVALX(buf,pos+2,val>>16)) | |
43 | #define SIVAL(buf,pos,val) SIVALX((buf),(pos),((uint32)(val))) | |
df6350a8 WD |
44 | |
45 | #define IVALu(buf,pos) IVAL(buf,pos) | |
46 | #define SIVALu(buf,pos,val) SIVAL(buf,pos,val) | |
47 | ||
48 | #else /* !CAREFUL_ALIGNMENT */ | |
49 | ||
50 | /* This handles things for architectures like the 386 that can handle alignment errors. | |
51 | * WARNING: This section is dependent on the length of an int32 (and thus a uint32) | |
52 | * being correct (4 bytes)! Set CAREFUL_ALIGNMENT if it is not. */ | |
53 | ||
54 | # ifdef AVOID_BYTEORDER_INLINE | |
55 | ||
c627d613 AT |
56 | #define IVAL(buf,pos) (*(uint32 *)((char *)(buf) + (pos))) |
57 | #define SIVAL(buf,pos,val) IVAL(buf,pos)=((uint32)(val)) | |
df6350a8 WD |
58 | |
59 | #define IVALu(buf,pos) IVAL(buf,pos) | |
60 | #define SIVALu(buf,pos,val) SIVAL(buf,pos,val) | |
61 | ||
62 | # else /* !AVOID_BYTEORDER_INLINE */ | |
63 | ||
64 | static inline uint32 | |
65 | IVALu(const uchar *buf, int pos) | |
66 | { | |
67 | union { | |
68 | const uchar *b; | |
69 | const uint32 *num; | |
70 | } u; | |
71 | u.b = buf + pos; | |
72 | return *u.num; | |
73 | } | |
74 | ||
75 | static inline void | |
76 | SIVALu(uchar *buf, int pos, uint32 val) | |
77 | { | |
78 | union { | |
79 | uchar *b; | |
80 | uint32 *num; | |
81 | } u; | |
82 | u.b = buf + pos; | |
83 | *u.num = val; | |
84 | } | |
85 | ||
86 | static inline uint32 | |
87 | IVAL(const char *buf, int pos) | |
88 | { | |
89 | return IVALu((uchar*)buf, pos); | |
90 | } | |
91 | ||
92 | static inline void | |
93 | SIVAL(char *buf, int pos, uint32 val) | |
94 | { | |
95 | SIVALu((uchar*)buf, pos, val); | |
96 | } | |
97 | ||
98 | # endif /* !AVOID_BYTEORDER_INLINE */ | |
99 | ||
100 | #endif /* !CAREFUL_ALIGNMENT */ |