1c3344a105
that makes it incompatible with all prior versions. A patch will be provided to allow talking with older (patched) rsync versions.
64 lines
2.3 KiB
C
64 lines
2.3 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 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 version 2 as
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* published by the Free Software Foundation.
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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, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#undef CAREFUL_ALIGNMENT
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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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#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 UVAL(buf,pos) ((uint32)CVAL(buf,pos))
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#define SCVAL(buf,pos,val) (CVAL(buf,pos) = (val))
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/* Our 64-bit numbers are sent in MSB-first order so that we can use
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* the highest bits to indicate the number of bytes sent. */
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#define NVAL1(b,m) (UVAL(b,0)&~(uint32)(m))
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#define NVAL2(b,m) (NVAL1(b,m)<<8|UVAL(b,1))
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#define NVAL3(b,m) (NVAL2(b,m)<<8|UVAL(b,2))
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#define NVAL4(b,m) (NVAL3(b,m)<<8|UVAL(b,3))
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#define NVAL5(b,m) ((int64)NVAL4(b,m)<<8|UVAL(b,4))
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#define NVAL6(b,m) (NVAL5(b,m)<<8|UVAL(b,5))
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#define NVAL7(b,m) (NVAL6(b,m)<<8|UVAL(b,6))
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#define NVAL8(b,m) (NVAL7(b,m)<<8|UVAL(b,7))
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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 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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#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 int32
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being correct. set CAREFUL_ALIGNMENT if it is not.
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*/
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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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#endif
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