lib/rfcnb/byteorder.h

   1 /*
   2  * Copyright (C) 1996-2019 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /*
  10  * Unix SMB/Netbios implementation.
  11  * Version 1.9.
  12  * SMB Byte handling
  13  * Copyright (C) Andrew Tridgell 1992-1995
  14  */
  15
  16 /*
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2 of the License, or
  20  * (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  30  */
  31
  32 /*
  33  * This file implements macros for machine independent short and
  34  * int manipulation
  35  */
  36
  37 #undef CAREFUL_ALIGNMENT
  38
  39 /* we know that the 386 can handle misalignment and has the "right"
  40  * byteorder */
  41 #ifdef __i386__
  42 #define CAREFUL_ALIGNMENT 0
  43 #endif
  44
  45 #ifndef CAREFUL_ALIGNMENT
  46 #define CAREFUL_ALIGNMENT 1
  47 #endif
  48
  49 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
  50 #define PVAL(buf,pos) ((unsigned)CVAL(buf,pos))
  51 #define SCVAL(buf,pos,val) (CVAL(buf,pos) = (val))
  52
  53 #if CAREFUL_ALIGNMENT
  54 #define SVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+1)<<8)
  55 #define IVAL(buf,pos) (SVAL(buf,pos)|SVAL(buf,(pos)+2)<<16)
  56 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
  57 #define SIVALX(buf,pos,val) (SSVALX(buf,pos,val&0xFFFF),SSVALX(buf,pos+2,val>>16))
  58 #define SVALS(buf,pos) ((int16)SVAL(buf,pos))
  59 #define IVALS(buf,pos) ((int32)IVAL(buf,pos))
  60 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((uint16)(val)))
  61 #define SIVAL(buf,pos,val) SIVALX((buf),(pos),((uint32)(val)))
  62 #define SSVALS(buf,pos,val) SSVALX((buf),(pos),((int16)(val)))
  63 #define SIVALS(buf,pos,val) SIVALX((buf),(pos),((int32)(val)))
  64 #else
  65 /* this handles things for architectures like the 386 that can handle
  66  * alignment errors */
  67 /*
  68  * WARNING: This section is dependent on the length of int16 and int32
  69  * being correct
  70  */
  71 #define SVAL(buf,pos) (*(uint16 *)((char *)(buf) + (pos)))
  72 #define IVAL(buf,pos) (*(uint32 *)((char *)(buf) + (pos)))
  73 #define SVALS(buf,pos) (*(int16 *)((char *)(buf) + (pos)))
  74 #define IVALS(buf,pos) (*(int32 *)((char *)(buf) + (pos)))
  75 #define SSVAL(buf,pos,val) SVAL(buf,pos)=((uint16)(val))
  76 #define SIVAL(buf,pos,val) IVAL(buf,pos)=((uint32)(val))
  77 #define SSVALS(buf,pos,val) SVALS(buf,pos)=((int16)(val))
  78 #define SIVALS(buf,pos,val) IVALS(buf,pos)=((int32)(val))
  79 #endif
  80
  81 /* now the reverse routines - these are used in nmb packets (mostly) */
  82 #define SREV(x) ((((x)&0xFF)<<8) | (((x)>>8)&0xFF))
  83 #define IREV(x) ((SREV(x)<<16) | (SREV((x)>>16)))
  84
  85 #define RSVAL(buf,pos) SREV(SVAL(buf,pos))
  86 #define RIVAL(buf,pos) IREV(IVAL(buf,pos))
  87 #define RSSVAL(buf,pos,val) SSVAL(buf,pos,SREV(val))
  88 #define RSIVAL(buf,pos,val) SIVAL(buf,pos,IREV(val))
  89