1 #include <u.h>
2 #include <libc.h>
3 #include <venti.h>
4 #include "cvt.h"
5
6 static int
checksize(int n)7 checksize(int n)
8 {
9 if(n < 256 || n > VtMaxLumpSize) {
10 werrstr("bad block size");
11 return -1;
12 }
13 return 0;
14 }
15
16 void
vtrootpack(VtRoot * r,uchar * p)17 vtrootpack(VtRoot *r, uchar *p)
18 {
19 uchar *op = p;
20
21 U16PUT(p, VtRootVersion);
22 p += 2;
23 memmove(p, r->name, sizeof(r->name));
24 p += sizeof(r->name);
25 memmove(p, r->type, sizeof(r->type));
26 p += sizeof(r->type);
27 memmove(p, r->score, VtScoreSize);
28 p += VtScoreSize;
29 U16PUT(p, r->blocksize);
30 p += 2;
31 memmove(p, r->prev, VtScoreSize);
32 p += VtScoreSize;
33
34 assert(p-op == VtRootSize);
35 }
36
37 int
vtrootunpack(VtRoot * r,uchar * p)38 vtrootunpack(VtRoot *r, uchar *p)
39 {
40 uchar *op = p;
41 uint vers;
42 memset(r, 0, sizeof(*r));
43
44 vers = U16GET(p);
45 if(vers != VtRootVersion) {
46 werrstr("unknown root version");
47 return -1;
48 }
49 p += 2;
50 memmove(r->name, p, sizeof(r->name));
51 r->name[sizeof(r->name)-1] = 0;
52 p += sizeof(r->name);
53 memmove(r->type, p, sizeof(r->type));
54 r->type[sizeof(r->type)-1] = 0;
55 p += sizeof(r->type);
56 memmove(r->score, p, VtScoreSize);
57 p += VtScoreSize;
58 r->blocksize = U16GET(p);
59 if(checksize(r->blocksize) < 0)
60 return -1;
61 p += 2;
62 memmove(r->prev, p, VtScoreSize);
63 p += VtScoreSize;
64
65 assert(p-op == VtRootSize);
66 return 0;
67 }
68