1 #include	<u.h>
2 #include	<libc.h>
3 #include	<fcall.h>
4 
5 int
6 statchecku(uchar *buf, uint nbuf, int dotu)
7 {
8 	uchar *ebuf;
9 	int i, nstr;
10 
11 	ebuf = buf + nbuf;
12 
13 	if(nbuf < STATFIXLEN || nbuf != BIT16SZ + GBIT16(buf))
14 		return -1;
15 
16 	buf += STATFIXLEN - 4 * BIT16SZ;
17 
18 	nstr = 4;
19 	if(dotu)
20 		nstr = 5;
21 	for(i = 0; i < nstr; i++){
22 		if(buf + BIT16SZ > ebuf)
23 			return -1;
24 		buf += BIT16SZ + GBIT16(buf);
25 	}
26 
27 	if(dotu)
28 		buf += 3*BIT32SZ;
29 
30 	if(buf != ebuf)
31 		return -1;
32 
33 	return 0;
34 }
35 
36 int
37 statcheck(uchar *buf, uint nbuf)
38 {
39 	return statchecku(buf, nbuf, 0);
40 }
41 
42 static char nullstring[] = "";
43 
44 uint
45 convM2Du(uchar *buf, uint nbuf, Dir *d, char *strs, int dotu)
46 {
47 	uchar *p, *ebuf;
48 	char *sv[5];
49 	int i, ns, nstr;
50 
51 	if(nbuf < STATFIXLEN)
52 		return 0; 
53 
54 	p = buf;
55 	ebuf = buf + nbuf;
56 
57 	p += BIT16SZ;	/* ignore size */
58 	d->type = GBIT16(p);
59 	p += BIT16SZ;
60 	d->dev = GBIT32(p);
61 	p += BIT32SZ;
62 	d->qid.type = GBIT8(p);
63 	p += BIT8SZ;
64 	d->qid.vers = GBIT32(p);
65 	p += BIT32SZ;
66 	d->qid.path = GBIT64(p);
67 	p += BIT64SZ;
68 	d->mode = GBIT32(p);
69 	p += BIT32SZ;
70 	d->atime = GBIT32(p);
71 	p += BIT32SZ;
72 	d->mtime = GBIT32(p);
73 	p += BIT32SZ;
74 	d->length = GBIT64(p);
75 	p += BIT64SZ;
76 
77 	nstr = 4;
78 	if(dotu)
79 		nstr = 5;
80 	for(i = 0; i < nstr; i++){
81 		if(p + BIT16SZ > ebuf)
82 			return 0;
83 		ns = GBIT16(p);
84 		p += BIT16SZ;
85 		if(p + ns > ebuf)
86 			return 0;
87 		if(strs){
88 			sv[i] = strs;
89 			memmove(strs, p, ns);
90 			strs += ns;
91 			*strs++ = '\0';
92 		}
93 		p += ns;
94 	}
95 
96 	if(dotu){
97 		if(p + BIT32SZ*3 > ebuf)
98 			return 0;
99 		d->uidnum = GBIT32(p);
100 		p += BIT32SZ;
101 		d->gidnum = GBIT32(p);
102 		p += BIT32SZ;
103 		d->muidnum = GBIT32(p);
104 		p += BIT32SZ;
105 	}
106 	
107 	if(strs){
108 		d->name = sv[0];
109 		d->uid = sv[1];
110 		d->gid = sv[2];
111 		d->muid = sv[3];
112 		d->ext = nullstring;
113 		if(dotu)
114 			d->ext = sv[4];
115 	}else{
116 		d->name = nullstring;
117 		d->uid = nullstring;
118 		d->gid = nullstring;
119 		d->muid = nullstring;
120 		d->ext = nullstring;
121 	}
122 	
123 	return p - buf;
124 }
125 
126 uint
127 convM2D(uchar *buf, uint nbuf, Dir *d, char *strs)
128 {
129 	return convM2Du(buf, nbuf, d, strs, 0);
130 }