53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/*
|
|
* Simple byteorder handling.
|
|
*
|
|
* Copyright (C) 1992-1995 Andrew Tridgell
|
|
* Copyright (C) 2007 Wayne Davison
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, visit the http://fsf.org website.
|
|
*/
|
|
|
|
#undef CAREFUL_ALIGNMENT
|
|
|
|
/* We know that the x86 can handle misalignment and has the same
|
|
* byte order (LSB-first) as the 32-bit numbers we transmit. */
|
|
#ifdef __i386__
|
|
#define CAREFUL_ALIGNMENT 0
|
|
#endif
|
|
|
|
#ifndef CAREFUL_ALIGNMENT
|
|
#define CAREFUL_ALIGNMENT 1
|
|
#endif
|
|
|
|
#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
|
|
#define UVAL(buf,pos) ((uint32)CVAL(buf,pos))
|
|
#define SCVAL(buf,pos,val) (CVAL(buf,pos) = (val))
|
|
|
|
#if CAREFUL_ALIGNMENT
|
|
#define PVAL(buf,pos) (UVAL(buf,pos)|UVAL(buf,(pos)+1)<<8)
|
|
#define IVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+2)<<16)
|
|
#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
|
|
#define SIVALX(buf,pos,val) (SSVALX(buf,pos,val&0xFFFF),SSVALX(buf,pos+2,val>>16))
|
|
#define SIVAL(buf,pos,val) SIVALX((buf),(pos),((uint32)(val)))
|
|
#else
|
|
/* this handles things for architectures like the 386 that can handle
|
|
alignment errors */
|
|
/*
|
|
WARNING: This section is dependent on the length of int32
|
|
being correct. set CAREFUL_ALIGNMENT if it is not.
|
|
*/
|
|
#define IVAL(buf,pos) (*(uint32 *)((char *)(buf) + (pos)))
|
|
#define SIVAL(buf,pos,val) IVAL(buf,pos)=((uint32)(val))
|
|
#endif
|