2 * Simple byteorder handling.
4 * Copyright (C) 1992-1995 Andrew Tridgell
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.
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.
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.
21 #undef CAREFUL_ALIGNMENT
23 /* We know that the x86 can handle misalignment and has the same
24 * byte order (LSB-first) as the 32-bit numbers we transmit. */
26 #define CAREFUL_ALIGNMENT 0
29 #ifndef CAREFUL_ALIGNMENT
30 #define CAREFUL_ALIGNMENT 1
33 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
34 #define UVAL(buf,pos) ((uint32)CVAL(buf,pos))
35 #define SCVAL(buf,pos,val) (CVAL(buf,pos) = (val))
37 /* Our 64-bit numbers are sent in MSB-first order so that we can use
38 * the highest bits to indicate the number of bytes sent. */
39 #define NVAL2(b,m) ((UVAL(b,0)&~(m))<<8|UVAL(b,1))
40 #define NVAL3(b,m) (NVAL2(b,m)<<8|UVAL(b,2))
41 #define NVAL4(b,m) (NVAL3(b,m)<<8|UVAL(b,3))
42 #define NVAL5(b,m) ((int64)NVAL4(b,m)<<8|UVAL(b,4))
43 #define NVAL6(b,m) (NVAL5(b,m)<<8|UVAL(b,5))
44 #define NVAL7(b,m) (NVAL6(b,m)<<8|UVAL(b,6))
45 #define NVAL8(b,m) (NVAL7(b,m)<<8|UVAL(b,7))
48 #define PVAL(buf,pos) (UVAL(buf,pos)|UVAL(buf,(pos)+1)<<8)
49 #define IVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+2)<<16)
50 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
51 #define SIVALX(buf,pos,val) (SSVALX(buf,pos,val&0xFFFF),SSVALX(buf,pos+2,val>>16))
52 #define SIVAL(buf,pos,val) SIVALX((buf),(pos),((uint32)(val)))
54 /* this handles things for architectures like the 386 that can handle
57 WARNING: This section is dependent on the length of int32
58 being correct. set CAREFUL_ALIGNMENT if it is not.
60 #define IVAL(buf,pos) (*(uint32 *)((char *)(buf) + (pos)))
61 #define SIVAL(buf,pos,val) IVAL(buf,pos)=((uint32)(val))