96 lines
1.7 KiB
C
96 lines
1.7 KiB
C
#include <u.h>
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#include <libc.h>
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#include <venti.h>
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#include "cvt.h"
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static int
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checksize(int n)
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{
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if(n < 256 || n > VtMaxLumpSize) {
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werrstr("bad block size %#ux", n);
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return -1;
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}
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return 0;
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}
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void
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vtentrypack(VtEntry *e, uchar *p, int index)
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{
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ulong t32;
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int flags;
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uchar *op;
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int depth;
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p += index * VtEntrySize;
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op = p;
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U32PUT(p, e->gen);
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p += 4;
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U16PUT(p, e->psize);
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p += 2;
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U16PUT(p, e->dsize);
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p += 2;
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depth = e->type&VtTypeDepthMask;
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flags = (e->flags&~(_VtEntryDir|_VtEntryDepthMask));
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flags |= depth << _VtEntryDepthShift;
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if(e->type - depth == VtDirType)
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flags |= _VtEntryDir;
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U8PUT(p, flags);
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p++;
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memset(p, 0, 5);
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p += 5;
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U48PUT(p, e->size, t32);
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p += 6;
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memmove(p, e->score, VtScoreSize);
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p += VtScoreSize;
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assert(p-op == VtEntrySize);
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}
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int
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vtentryunpack(VtEntry *e, uchar *p, int index)
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{
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uchar *op;
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p += index * VtEntrySize;
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op = p;
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e->gen = U32GET(p);
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p += 4;
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e->psize = U16GET(p);
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p += 2;
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e->dsize = U16GET(p);
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p += 2;
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e->flags = U8GET(p);
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e->type = (e->flags&_VtEntryDir) ? VtDirType : VtDataType;
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e->type += (e->flags & _VtEntryDepthMask) >> _VtEntryDepthShift;
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e->flags &= ~(_VtEntryDir|_VtEntryDepthMask);
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p++;
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p += 5;
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e->size = U48GET(p);
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p += 6;
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memmove(e->score, p, VtScoreSize);
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p += VtScoreSize;
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assert(p-op == VtEntrySize);
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if(!(e->flags & VtEntryActive))
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return 0;
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/*
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* Some old vac files use psize==0 and dsize==0 when the
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* file itself has size 0 or is zeros. Just to make programs not
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* have to figure out what block sizes of 0 means, rewrite them.
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*/
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if(e->psize == 0 && e->dsize == 0
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&& memcmp(e->score, vtzeroscore, VtScoreSize) == 0){
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e->psize = 4096;
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e->dsize = 4096;
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}
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if(checksize(e->psize) < 0 || checksize(e->dsize) < 0)
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return -1;
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return 0;
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}
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