/* * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */#include <u.h>#include <libc.h>#include <oventi.h>/* score of a zero length block */uchar vtZeroScore[VtScoreSize] = { 0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d, 0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90, 0xaf, 0xd8, 0x07, 0x09};intvtZeroExtend(int type, uchar *buf, int n, int nn){ uchar *p, *ep; switch(type) { default: memset(buf+n, 0, nn-n); break; case VtPointerType0: case VtPointerType1: case VtPointerType2: case VtPointerType3: case VtPointerType4: case VtPointerType5: case VtPointerType6: case VtPointerType7: case VtPointerType8: case VtPointerType9: p = buf + (n/VtScoreSize)*VtScoreSize; ep = buf + (nn/VtScoreSize)*VtScoreSize; while(p < ep) { memmove(p, vtZeroScore, VtScoreSize); p += VtScoreSize; } memset(p, 0, buf+nn-p); break; } return 1;}int vtZeroTruncate(int type, uchar *buf, int n){ uchar *p; switch(type) { default: for(p = buf + n; p > buf; p--) { if(p[-1] != 0) break; } return p - buf; case VtRootType: if(n < VtRootSize) return n; return VtRootSize; case VtPointerType0: case VtPointerType1: case VtPointerType2: case VtPointerType3: case VtPointerType4: case VtPointerType5: case VtPointerType6: case VtPointerType7: case VtPointerType8: case VtPointerType9: /* ignore slop at end of block */ p = buf + (n/VtScoreSize)*VtScoreSize; while(p > buf) { if(memcmp(p - VtScoreSize, vtZeroScore, VtScoreSize) != 0) break; p -= VtScoreSize; } return p - buf; }}
/*
* This file is part of the UCB release of Plan 9. It is subject to the license
* terms in the LICENSE file found in the top-level directory of this
* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
* part of the UCB release of Plan 9, including this file, may be copied,
* modified, propagated, or distributed except according to the terms contained
* in the LICENSE file.
*/
#include <u.h>
#include <libc.h>
#include <oventi.h>
/* score of a zero length block */
uchar vtZeroScore[VtScoreSize] = {
0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d, 0x32, 0x55,
0xbf, 0xef, 0x95, 0x60, 0x18, 0x90, 0xaf, 0xd8, 0x07, 0x09
};
int
vtZeroExtend(int type, uchar *buf, int n, int nn)
{
uchar *p, *ep;
switch(type) {
default:
memset(buf+n, 0, nn-n);
break;
case VtPointerType0:
case VtPointerType1:
case VtPointerType2:
case VtPointerType3:
case VtPointerType4:
case VtPointerType5:
case VtPointerType6:
case VtPointerType7:
case VtPointerType8:
case VtPointerType9:
p = buf + (n/VtScoreSize)*VtScoreSize;
ep = buf + (nn/VtScoreSize)*VtScoreSize;
while(p < ep) {
memmove(p, vtZeroScore, VtScoreSize);
p += VtScoreSize;
}
memset(p, 0, buf+nn-p);
break;
}
return 1;
}
int
vtZeroTruncate(int type, uchar *buf, int n)
{
uchar *p;
switch(type) {
default:
for(p = buf + n; p > buf; p--) {
if(p[-1] != 0)
break;
}
return p - buf;
case VtRootType:
if(n < VtRootSize)
return n;
return VtRootSize;
case VtPointerType0:
case VtPointerType1:
case VtPointerType2:
case VtPointerType3:
case VtPointerType4:
case VtPointerType5:
case VtPointerType6:
case VtPointerType7:
case VtPointerType8:
case VtPointerType9:
/* ignore slop at end of block */
p = buf + (n/VtScoreSize)*VtScoreSize;
while(p > buf) {
if(memcmp(p - VtScoreSize, vtZeroScore, VtScoreSize) != 0)
break;
p -= VtScoreSize;
}
return p - buf;
}
}