o5r/plan9port
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

new venti library.

Browse source
This commit is contained in:
rsc 2003-11-23 18:19:58 +00:00
parent 9df487d720
commit 056fe1ba7f
28 changed files with 4635 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

85
src/libventi/entry.c Normal file
View file

@ -0,0 +1,85 @@
#include <u.h>
#include <libc.h>
#include <venti.h>
#include "cvt.h"
static int
checksize(int n)
{
if(n < 256 || n > VtMaxLumpSize) {
werrstr("bad block size");
return -1;
}
return 0;
}
void
vtentrypack(VtEntry *e, uchar *p, int index)
{
ulong t32;
int flags;
uchar *op;
int depth;
p += index * VtEntrySize;
op = p;
U32PUT(p, e->gen);
p += 4;
U16PUT(p, e->psize);
p += 2;
U16PUT(p, e->dsize);
p += 2;
depth = e->type&VtTypeDepthMask;
flags = (e->flags&~(VtEntryDir|VtEntryDepthShift));
flags |= depth << VtEntryDepthShift;
if(e->type - depth == VtEntryDir)
flags |= VtEntryDir;
U8PUT(p, flags);
p++;
memset(p, 0, 5);
p += 5;
U48PUT(p, e->size, t32);
p += 6;
memmove(p, e->score, VtScoreSize);
p += VtScoreSize;
assert(p-op == VtEntrySize);
}
int
vtentryunpack(VtEntry *e, uchar *p, int index)
{
uchar *op;
p += index * VtEntrySize;
op = p;
e->gen = U32GET(p);
p += 4;
e->psize = U16GET(p);
p += 2;
e->dsize = U16GET(p);
p += 2;
e->flags = U8GET(p);
e->type = (e->flags&VtEntryDir) ? VtDirType : VtDataType;
e->type += (e->flags & VtEntryDepthMask) >> VtEntryDepthShift;
e->flags &= ~(VtEntryDir|VtEntryDepthMask);
p++;
p += 5;
e->size = U48GET(p);
p += 6;
memmove(e->score, p, VtScoreSize);
p += VtScoreSize;
assert(p-op == VtEntrySize);
if(!(e->flags & VtEntryActive))
return 0;
if(checksize(e->psize) < 0 || checksize(e->dsize) < 0)
return -1;
return 0;
}