/* Unix SMB/CIFS implementation. SMB Byte handling Copyright (C) Andrew Tridgell 1992-1998 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef _BYTEORDER_H #define _BYTEORDER_H /* This file implements macros for machine independent short and int manipulation Here is a description of this file that I emailed to the samba list once: > I am confused about the way that byteorder.h works in Samba. I have > looked at it, and I would have thought that you might make a distinction > between LE and BE machines, but you only seem to distinguish between 386 > and all other architectures. > > Can you give me a clue? sure. The distinction between 386 and other architectures is only there as an optimisation. You can take it out completely and it will make no difference. The routines (macros) in byteorder.h are totally byteorder independent. The 386 optimsation just takes advantage of the fact that the x86 processors don't care about alignment, so we don't have to align ints on int boundaries etc. If there are other processors out there that aren't alignment sensitive then you could also define CAREFUL_ALIGNMENT=0 on those processors as well. Ok, now to the macros themselves. I'll take a simple example, say we want to extract a 2 byte integer from a SMB packet and put it into a type called uint16 that is in the local machines byte order, and you want to do it with only the assumption that uint16 is _at_least_ 16 bits long (this last condition is very important for architectures that don't have any int types that are 2 bytes long) You do this: #define CVAL(buf,pos) (((unsigned char *)(buf))[pos]) #define PVAL(buf,pos) ((unsigned)CVAL(buf,pos)) #define SVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+1)<<8) then to extract a uint16 value at offset 25 in a buffer you do this: char *buffer = foo_bar(); uint16 xx = SVAL(buffer,25); We are using the byteoder independence of the ANSI C bitshifts to do the work. A good optimising compiler should turn this into efficient code, especially if it happens to have the right byteorder :-) I know these macros can be made a bit tidier by removing some of the casts, but you need to look at byteorder.h as a whole to see the reasoning behind them. byteorder.h defines the following macros: SVAL(buf,pos) - extract a 2 byte SMB value IVAL(buf,pos) - extract a 4 byte SMB value SVALS(buf,pos) signed version of SVAL() IVALS(buf,pos) signed version of IVAL() SSVAL(buf,pos,val) - put a 2 byte SMB value into a buffer SIVAL(buf,pos,val) - put a 4 byte SMB value into a buffer SSVALS(buf,pos,val) - signed version of SSVAL() SIVALS(buf,pos,val) - signed version of SIVAL() RSVAL(buf,pos) - like SVAL() but for NMB byte ordering RSVALS(buf,pos) - like SVALS() but for NMB byte ordering RIVAL(buf,pos) - like IVAL() but for NMB byte ordering RIVALS(buf,pos) - like IVALS() but for NMB byte ordering RSSVAL(buf,pos,val) - like SSVAL() but for NMB ordering RSIVAL(buf,pos,val) - like SIVAL() but for NMB ordering RSIVALS(buf,pos,val) - like SIVALS() but for NMB ordering it also defines lots of intermediate macros, just ignore those :-) */ #undef CAREFUL_ALIGNMENT /* we know that the 386 can handle misalignment and has the "right" byteorder */ #ifdef __i386__ #define CAREFUL_ALIGNMENT 0 #endif #ifndef CAREFUL_ALIGNMENT #define CAREFUL_ALIGNMENT 1 #endif #define CVAL(buf,pos) ((unsigned)(((const unsigned char *)(buf))[pos])) #define CVAL_NC(buf,pos) (((unsigned char *)(buf))[pos]) /* Non-const version of CVAL */ #define PVAL(buf,pos) (CVAL(buf,pos)) #define SCVAL(buf,pos,val) (CVAL_NC(buf,pos) = (val)) #if CAREFUL_ALIGNMENT #define SVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+1)<<8) #define IVAL(buf,pos) (SVAL(buf,pos)|SVAL(buf,(pos)+2)<<16) #define SSVALX(buf,pos,val) (CVAL_NC(buf,pos)=(unsigned char)((val)&0xFF),CVAL_NC(buf,pos+1)=(unsigned char)((val)>>8)) #define SIVALX(buf,pos,val) (SSVALX(buf,pos,val&0xFFFF),SSVALX(buf,pos+2,val>>16)) #define SVALS(buf,pos) ((int16)SVAL(buf,pos)) #define IVALS(buf,pos) ((int32)IVAL(buf,pos)) #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((uint16)(val))) #define SIVAL(buf,pos,val) SIVALX((buf),(pos),((uint32)(val))) #define SSVALS(buf,pos,val) SSVALX((buf),(pos),((int16)(val))) #define SIVALS(buf,pos,val) SIVALX((buf),(pos),((int32)(val))) #else /* CAREFUL_ALIGNMENT */ /* this handles things for architectures like the 386 that can handle alignment errors */ /* WARNING: This section is dependent on the length of int16 and int32 being correct */ /* get single value from an SMB buffer */ #define SVAL(buf,pos) (*(const uint16 *)((const char *)(buf) + (pos))) #define SVAL_NC(buf,pos) (*(uint16 *)((char *)(buf) + (pos))) /* Non const version of above. */ #define IVAL(buf,pos) (*(const uint32 *)((const char *)(buf) + (pos))) #define IVAL_NC(buf,pos) (*(uint32 *)((char *)(buf) + (pos))) /* Non const version of above. */ #define SVALS(buf,pos) (*(const int16 *)((const char *)(buf) + (pos))) #define SVALS_NC(buf,pos) (*(int16 *)((char *)(buf) + (pos))) /* Non const version of above. */ #define IVALS(buf,pos) (*(const int32 *)((const char *)(buf) + (pos))) #define IVALS_NC(buf,pos) (*(int32 *)((char *)(buf) + (pos))) /* Non const version of above. */ /* store single value in an SMB buffer */ #define SSVAL(buf,pos,val) SVAL_NC(buf,pos)=((uint16)(val)) #define SIVAL(buf,pos,val) IVAL_NC(buf,pos)=((uint32)(val)) #define SSVALS(buf,pos,val) SVALS_NC(buf,pos)=((int16)(val)) #define SIVALS(buf,pos,val) IVALS_NC(buf,pos)=((int32)(val)) #endif /* CAREFUL_ALIGNMENT */ /* now the reverse routines - these are used in nmb packets (mostly) */ #define SREV(x) ((((x)&0xFF)<<8) | (((x)>>8)&0xFF)) #define IREV(x) ((SREV(x)<<16) | (SREV((x)>>16))) #define RSVAL(buf,pos) SREV(SVAL(buf,pos)) #define RSVALS(buf,pos) SREV(SVALS(buf,pos)) #define RIVAL(buf,pos) IREV(IVAL(buf,pos)) #define RIVALS(buf,pos) IREV(IVALS(buf,pos)) #define RSSVAL(buf,pos,val) SSVAL(buf,pos,SREV(val)) #define RSSVALS(buf,pos,val) SSVALS(buf,pos,SREV(val)) #define RSIVAL(buf,pos,val) SIVAL(buf,pos,IREV(val)) #define RSIVALS(buf,pos,val) SIVALS(buf,pos,IREV(val)) /* Alignment macros. */ #define ALIGN4(p,base) ((p) + ((4 - (PTR_DIFF((p), (base)) & 3)) & 3)) #define ALIGN2(p,base) ((p) + ((2 - (PTR_DIFF((p), (base)) & 1)) & 1)) #endif /* _BYTEORDER_H */