1 056fe1ba 2003-11-23 devnull #include <u.h>
 2 056fe1ba 2003-11-23 devnull #include <libc.h>
 3 056fe1ba 2003-11-23 devnull #include <venti.h>
 4 056fe1ba 2003-11-23 devnull #include "cvt.h"
 5 056fe1ba 2003-11-23 devnull 
 6 056fe1ba 2003-11-23 devnull static int
 7 056fe1ba 2003-11-23 devnull checksize(int n)
 8 056fe1ba 2003-11-23 devnull {
 9 056fe1ba 2003-11-23 devnull 	if(n < 256 || n > VtMaxLumpSize) {
10 23fb2edb 2005-07-24 devnull 		werrstr("bad block size %#ux", n);
11 056fe1ba 2003-11-23 devnull 		return -1;
12 056fe1ba 2003-11-23 devnull 	}
13 056fe1ba 2003-11-23 devnull 	return 0;
14 056fe1ba 2003-11-23 devnull }
15 056fe1ba 2003-11-23 devnull 
16 056fe1ba 2003-11-23 devnull void
17 056fe1ba 2003-11-23 devnull vtentrypack(VtEntry *e, uchar *p, int index)
18 056fe1ba 2003-11-23 devnull {
19 056fe1ba 2003-11-23 devnull 	ulong t32;
20 056fe1ba 2003-11-23 devnull 	int flags;
21 056fe1ba 2003-11-23 devnull 	uchar *op;
22 056fe1ba 2003-11-23 devnull 	int depth;
23 056fe1ba 2003-11-23 devnull 
24 056fe1ba 2003-11-23 devnull 	p += index * VtEntrySize;
25 056fe1ba 2003-11-23 devnull 	op = p;
26 056fe1ba 2003-11-23 devnull 
27 056fe1ba 2003-11-23 devnull 	U32PUT(p, e->gen);
28 056fe1ba 2003-11-23 devnull 	p += 4;
29 056fe1ba 2003-11-23 devnull 	U16PUT(p, e->psize);
30 056fe1ba 2003-11-23 devnull 	p += 2;
31 056fe1ba 2003-11-23 devnull 	U16PUT(p, e->dsize);
32 056fe1ba 2003-11-23 devnull 	p += 2;
33 056fe1ba 2003-11-23 devnull 	depth = e->type&VtTypeDepthMask;
34 d23a617a 2004-03-15 devnull 	flags = (e->flags&~(_VtEntryDir|_VtEntryDepthMask));
35 d23a617a 2004-03-15 devnull 	flags |= depth << _VtEntryDepthShift;
36 d23a617a 2004-03-15 devnull 	if(e->type - depth == VtDirType)
37 d23a617a 2004-03-15 devnull 		flags |= _VtEntryDir;
38 056fe1ba 2003-11-23 devnull 	U8PUT(p, flags);
39 056fe1ba 2003-11-23 devnull 	p++;
40 056fe1ba 2003-11-23 devnull 	memset(p, 0, 5);
41 056fe1ba 2003-11-23 devnull 	p += 5;
42 056fe1ba 2003-11-23 devnull 	U48PUT(p, e->size, t32);
43 056fe1ba 2003-11-23 devnull 	p += 6;
44 056fe1ba 2003-11-23 devnull 	memmove(p, e->score, VtScoreSize);
45 056fe1ba 2003-11-23 devnull 	p += VtScoreSize;
46 056fe1ba 2003-11-23 devnull 
47 056fe1ba 2003-11-23 devnull 	assert(p-op == VtEntrySize);
48 056fe1ba 2003-11-23 devnull }
49 056fe1ba 2003-11-23 devnull 
50 056fe1ba 2003-11-23 devnull int
51 056fe1ba 2003-11-23 devnull vtentryunpack(VtEntry *e, uchar *p, int index)
52 056fe1ba 2003-11-23 devnull {
53 056fe1ba 2003-11-23 devnull 	uchar *op;
54 056fe1ba 2003-11-23 devnull 
55 056fe1ba 2003-11-23 devnull 	p += index * VtEntrySize;
56 056fe1ba 2003-11-23 devnull 	op = p;
57 056fe1ba 2003-11-23 devnull 
58 056fe1ba 2003-11-23 devnull 	e->gen = U32GET(p);
59 056fe1ba 2003-11-23 devnull 	p += 4;
60 056fe1ba 2003-11-23 devnull 	e->psize = U16GET(p);
61 056fe1ba 2003-11-23 devnull 	p += 2;
62 056fe1ba 2003-11-23 devnull 	e->dsize = U16GET(p);
63 056fe1ba 2003-11-23 devnull 	p += 2;
64 056fe1ba 2003-11-23 devnull 	e->flags = U8GET(p);
65 d23a617a 2004-03-15 devnull 	e->type = (e->flags&_VtEntryDir) ? VtDirType : VtDataType;
66 d23a617a 2004-03-15 devnull 	e->type += (e->flags & _VtEntryDepthMask) >> _VtEntryDepthShift;
67 d23a617a 2004-03-15 devnull 	e->flags &= ~(_VtEntryDir|_VtEntryDepthMask);
68 056fe1ba 2003-11-23 devnull 	p++;
69 056fe1ba 2003-11-23 devnull 	p += 5;
70 056fe1ba 2003-11-23 devnull 	e->size = U48GET(p);
71 056fe1ba 2003-11-23 devnull 	p += 6;
72 056fe1ba 2003-11-23 devnull 	memmove(e->score, p, VtScoreSize);
73 056fe1ba 2003-11-23 devnull 	p += VtScoreSize;
74 056fe1ba 2003-11-23 devnull 
75 056fe1ba 2003-11-23 devnull 	assert(p-op == VtEntrySize);
76 056fe1ba 2003-11-23 devnull 	
77 056fe1ba 2003-11-23 devnull 	if(!(e->flags & VtEntryActive))
78 056fe1ba 2003-11-23 devnull 		return 0;
79 056fe1ba 2003-11-23 devnull 
80 23fb2edb 2005-07-24 devnull 	/* 
81 23fb2edb 2005-07-24 devnull 	 * Some old vac files use psize==0 and dsize==0 when the
82 23fb2edb 2005-07-24 devnull 	 * file itself has size 0 or is zeros.  Just to make programs not
83 23fb2edb 2005-07-24 devnull 	 * have to figure out what block sizes of 0 means, rewrite them.
84 23fb2edb 2005-07-24 devnull 	 */
85 23fb2edb 2005-07-24 devnull 	if(e->psize == 0 && e->dsize == 0
86 23fb2edb 2005-07-24 devnull 	&& memcmp(e->score, vtzeroscore, VtScoreSize) == 0){
87 23fb2edb 2005-07-24 devnull 		e->psize = 4096;
88 23fb2edb 2005-07-24 devnull 		e->dsize = 4096;
89 23fb2edb 2005-07-24 devnull 	}
90 056fe1ba 2003-11-23 devnull 	if(checksize(e->psize) < 0 || checksize(e->dsize) < 0)
91 056fe1ba 2003-11-23 devnull 		return -1;
92 056fe1ba 2003-11-23 devnull 
93 056fe1ba 2003-11-23 devnull 	return 0;
94 056fe1ba 2003-11-23 devnull }
95 056fe1ba 2003-11-23 devnull