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81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 1.9.
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SMB Byte handling
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Copyright (C) Andrew Tridgell 1992-1995
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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This file implements macros for machine independent short and
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int manipulation
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*/
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#undef CAREFUL_ALIGNMENT
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/* we know that the 386 can handle misalignment and has the "right"
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byteorder */
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#ifdef __i386__
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#define CAREFUL_ALIGNMENT 0
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#endif
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#ifndef CAREFUL_ALIGNMENT
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#define CAREFUL_ALIGNMENT 1
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#endif
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#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
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#define PVAL(buf,pos) ((unsigned)CVAL(buf,pos))
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#define SCVAL(buf,pos,val) (CVAL(buf,pos) = (val))
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#if CAREFUL_ALIGNMENT
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#define SVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+1)<<8)
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#define IVAL(buf,pos) (SVAL(buf,pos)|SVAL(buf,(pos)+2)<<16)
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#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
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#define SIVALX(buf,pos,val) (SSVALX(buf,pos,val&0xFFFF),SSVALX(buf,pos+2,val>>16))
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#define SVALS(buf,pos) ((int16)SVAL(buf,pos))
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#define IVALS(buf,pos) ((int32)IVAL(buf,pos))
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#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((uint16)(val)))
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#define SIVAL(buf,pos,val) SIVALX((buf),(pos),((uint32)(val)))
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#define SSVALS(buf,pos,val) SSVALX((buf),(pos),((int16)(val)))
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#define SIVALS(buf,pos,val) SIVALX((buf),(pos),((int32)(val)))
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#else
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/* this handles things for architectures like the 386 that can handle
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alignment errors */
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/*
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WARNING: This section is dependent on the length of int16 and int32
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being correct
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*/
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#define SVAL(buf,pos) (*(uint16 *)((char *)(buf) + (pos)))
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#define IVAL(buf,pos) (*(uint32 *)((char *)(buf) + (pos)))
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#define SVALS(buf,pos) (*(int16 *)((char *)(buf) + (pos)))
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#define IVALS(buf,pos) (*(int32 *)((char *)(buf) + (pos)))
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#define SSVAL(buf,pos,val) SVAL(buf,pos)=((uint16)(val))
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#define SIVAL(buf,pos,val) IVAL(buf,pos)=((uint32)(val))
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#define SSVALS(buf,pos,val) SVALS(buf,pos)=((int16)(val))
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#define SIVALS(buf,pos,val) IVALS(buf,pos)=((int32)(val))
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#endif
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/* now the reverse routines - these are used in nmb packets (mostly) */
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#define SREV(x) ((((x)&0xFF)<<8) | (((x)>>8)&0xFF))
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#define IREV(x) ((SREV(x)<<16) | (SREV((x)>>16)))
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#define RSVAL(buf,pos) SREV(SVAL(buf,pos))
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#define RIVAL(buf,pos) IREV(IVAL(buf,pos))
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#define RSSVAL(buf,pos,val) SSVAL(buf,pos,SREV(val))
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#define RSIVAL(buf,pos,val) SIVAL(buf,pos,IREV(val))
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