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125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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* Simple byteorder handling.
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*
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* Copyright (C) 1992-1995 Andrew Tridgell
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* Copyright (C) 2007-2014 Wayne Davison
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*
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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 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, visit the http://fsf.org website.
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*/
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#undef CAREFUL_ALIGNMENT
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#undef AVOID_BYTEORDER_INLINE
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/* We know that the x86 can handle misalignment and has the same
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* byte order (LSB-first) as the 32-bit numbers we transmit. */
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#if defined __i386__ || defined __i486__ || defined __i586__ || defined __i686__ || __amd64
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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 UVAL(buf,pos) ((uint32)CVAL(buf,pos))
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#if CAREFUL_ALIGNMENT
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#define PVAL(buf,pos) (UVAL(buf,pos)|UVAL(buf,(pos)+1)<<8)
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#define IVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+2)<<16)
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#define IVAL64(buf,pos) (IVAL(buf,pos)|(int64)IVAL(buf,(pos)+4)<<32)
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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 SIVAL(buf,pos,val) SIVALX(buf,pos,(uint32)(val))
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#define SIVAL64(buf,pos,val) (SIVAL(buf,pos,val),SIVAL(buf,(pos)+4,(val)>>32))
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#define IVALu(buf,pos) IVAL(buf,pos)
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#define SIVALu(buf,pos,val) SIVAL(buf,pos,val)
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#else /* !CAREFUL_ALIGNMENT */
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/* This handles things for architectures like the 386 that can handle alignment errors.
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* WARNING: This section is dependent on the length of an int32 (and thus a uint32)
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* being correct (4 bytes)! Set CAREFUL_ALIGNMENT if it is not. */
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# ifdef AVOID_BYTEORDER_INLINE
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#define IVAL(buf,pos) (*(uint32 *)((char *)(buf) + (pos)))
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#define SIVAL(buf,pos,val) IVAL(buf,pos)=((uint32)(val))
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#define IVALu(buf,pos) IVAL(buf,pos)
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#define SIVALu(buf,pos,val) SIVAL(buf,pos,val)
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# else /* !AVOID_BYTEORDER_INLINE */
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static inline uint32
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IVALu(const uchar *buf, int pos)
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{
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union {
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const uchar *b;
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const uint32 *num;
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} u;
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u.b = buf + pos;
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return *u.num;
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}
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static inline void
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SIVALu(uchar *buf, int pos, uint32 val)
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{
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union {
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uchar *b;
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uint32 *num;
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} u;
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u.b = buf + pos;
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*u.num = val;
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}
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static inline uint32
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IVAL(const char *buf, int pos)
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{
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return IVALu((uchar*)buf, pos);
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}
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static inline void
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SIVAL(char *buf, int pos, uint32 val)
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{
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SIVALu((uchar*)buf, pos, val);
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}
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static inline int64
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IVAL64(const char *buf, int pos)
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{
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union {
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const char *b;
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const int64 *num;
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} u;
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u.b = buf + pos;
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return *u.num;
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}
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static inline void
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SIVAL64(char *buf, int pos, int64 val)
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{
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union {
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char *b;
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int64 *num;
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} u;
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u.b = buf + pos;
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*u.num = val;
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}
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# endif /* !AVOID_BYTEORDER_INLINE */
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#endif /* !CAREFUL_ALIGNMENT */
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