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0f78b815 WD |
1 | /* |
2 | * Simple byteorder handling. | |
3 | * | |
4 | * Copyright (C) 1992-1995 Andrew Tridgell | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
e7c67065 WD |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
0f78b815 | 19 | */ |
c627d613 AT |
20 | |
21 | #undef CAREFUL_ALIGNMENT | |
22 | ||
0f78b815 | 23 | /* we know that the x86 can handle misalignment and has the "right" |
c627d613 AT |
24 | byteorder */ |
25 | #ifdef __i386__ | |
26 | #define CAREFUL_ALIGNMENT 0 | |
27 | #endif | |
28 | ||
29 | #ifndef CAREFUL_ALIGNMENT | |
30 | #define CAREFUL_ALIGNMENT 1 | |
31 | #endif | |
32 | ||
33 | #define CVAL(buf,pos) (((unsigned char *)(buf))[pos]) | |
34 | #define PVAL(buf,pos) ((unsigned)CVAL(buf,pos)) | |
35 | #define SCVAL(buf,pos,val) (CVAL(buf,pos) = (val)) | |
36 | ||
37 | ||
38 | #if CAREFUL_ALIGNMENT | |
39 | #define SVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+1)<<8) | |
40 | #define IVAL(buf,pos) (SVAL(buf,pos)|SVAL(buf,(pos)+2)<<16) | |
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))) | |
44 | #else | |
45 | /* this handles things for architectures like the 386 that can handle | |
46 | alignment errors */ | |
47 | /* | |
48 | WARNING: This section is dependent on the length of int32 | |
49 | being correct. set CAREFUL_ALIGNMENT if it is not. | |
50 | */ | |
51 | #define IVAL(buf,pos) (*(uint32 *)((char *)(buf) + (pos))) | |
52 | #define SIVAL(buf,pos,val) IVAL(buf,pos)=((uint32)(val)) | |
53 | #endif | |
54 | ||
55 |