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 75d04888 2009-05-25 rsc 	if(n < 256) {
10 056fe1ba 2003-11-23 devnull 		werrstr("bad block size");
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 75d04888 2009-05-25 rsc extern int vttobig(ulong);
17 75d04888 2009-05-25 rsc 
18 056fe1ba 2003-11-23 devnull void
19 056fe1ba 2003-11-23 devnull vtrootpack(VtRoot *r, uchar *p)
20 056fe1ba 2003-11-23 devnull {
21 056fe1ba 2003-11-23 devnull 	uchar *op = p;
22 75d04888 2009-05-25 rsc 	int vers, bsize;
23 056fe1ba 2003-11-23 devnull 
24 75d04888 2009-05-25 rsc 	vers = VtRootVersion;
25 75d04888 2009-05-25 rsc 	bsize = r->blocksize;
26 75d04888 2009-05-25 rsc 	if(bsize >= (1<<16)) {
27 75d04888 2009-05-25 rsc 		vers |= _VtRootVersionBig;
28 75d04888 2009-05-25 rsc 		bsize = vttobig(bsize);
29 75d04888 2009-05-25 rsc 		if(bsize < 0)
30 36c242dd 2011-11-08 rsc 			sysfatal("invalid root blocksize: %#lx", r->blocksize);
31 75d04888 2009-05-25 rsc 	}
32 75d04888 2009-05-25 rsc 	U16PUT(p, vers);
33 056fe1ba 2003-11-23 devnull 	p += 2;
34 056fe1ba 2003-11-23 devnull 	memmove(p, r->name, sizeof(r->name));
35 056fe1ba 2003-11-23 devnull 	p += sizeof(r->name);
36 056fe1ba 2003-11-23 devnull 	memmove(p, r->type, sizeof(r->type));
37 056fe1ba 2003-11-23 devnull 	p += sizeof(r->type);
38 056fe1ba 2003-11-23 devnull 	memmove(p, r->score, VtScoreSize);
39 056fe1ba 2003-11-23 devnull 	p +=  VtScoreSize;
40 75d04888 2009-05-25 rsc 	U16PUT(p, bsize);
41 056fe1ba 2003-11-23 devnull 	p += 2;
42 056fe1ba 2003-11-23 devnull 	memmove(p, r->prev, VtScoreSize);
43 056fe1ba 2003-11-23 devnull 	p += VtScoreSize;
44 056fe1ba 2003-11-23 devnull 
45 056fe1ba 2003-11-23 devnull 	assert(p-op == VtRootSize);
46 056fe1ba 2003-11-23 devnull }
47 056fe1ba 2003-11-23 devnull 
48 056fe1ba 2003-11-23 devnull int
49 056fe1ba 2003-11-23 devnull vtrootunpack(VtRoot *r, uchar *p)
50 056fe1ba 2003-11-23 devnull {
51 056fe1ba 2003-11-23 devnull 	uchar *op = p;
52 056fe1ba 2003-11-23 devnull 	uint vers;
53 056fe1ba 2003-11-23 devnull 	memset(r, 0, sizeof(*r));
54 056fe1ba 2003-11-23 devnull 
55 056fe1ba 2003-11-23 devnull 	vers = U16GET(p);
56 75d04888 2009-05-25 rsc 	if((vers&~_VtRootVersionBig) != VtRootVersion) {
57 056fe1ba 2003-11-23 devnull 		werrstr("unknown root version");
58 0c148046 2004-06-16 devnull 		return -1;
59 056fe1ba 2003-11-23 devnull 	}
60 056fe1ba 2003-11-23 devnull 	p += 2;
61 056fe1ba 2003-11-23 devnull 	memmove(r->name, p, sizeof(r->name));
62 056fe1ba 2003-11-23 devnull 	r->name[sizeof(r->name)-1] = 0;
63 056fe1ba 2003-11-23 devnull 	p += sizeof(r->name);
64 056fe1ba 2003-11-23 devnull 	memmove(r->type, p, sizeof(r->type));
65 056fe1ba 2003-11-23 devnull 	r->type[sizeof(r->type)-1] = 0;
66 056fe1ba 2003-11-23 devnull 	p += sizeof(r->type);
67 056fe1ba 2003-11-23 devnull 	memmove(r->score, p, VtScoreSize);
68 056fe1ba 2003-11-23 devnull 	p +=  VtScoreSize;
69 056fe1ba 2003-11-23 devnull 	r->blocksize = U16GET(p);
70 75d04888 2009-05-25 rsc 	if(vers & _VtRootVersionBig)
71 75d04888 2009-05-25 rsc 		r->blocksize = (r->blocksize >> 5) << (r->blocksize & 31);
72 056fe1ba 2003-11-23 devnull 	if(checksize(r->blocksize) < 0)
73 056fe1ba 2003-11-23 devnull 		return -1;
74 056fe1ba 2003-11-23 devnull 	p += 2;
75 056fe1ba 2003-11-23 devnull 	memmove(r->prev, p, VtScoreSize);
76 056fe1ba 2003-11-23 devnull 	p += VtScoreSize;
77 056fe1ba 2003-11-23 devnull 
78 056fe1ba 2003-11-23 devnull 	assert(p-op == VtRootSize);
79 056fe1ba 2003-11-23 devnull 	return 0;
80 056fe1ba 2003-11-23 devnull }