1 #include <u.h>
2 #include <libc.h>
3 #include <bin.h>
4 #include <httpd.h>
5 
6 /* go from url with escaped utf to utf */
7 char *
8 hurlunesc(HConnect *cc, char *s)
9 {
10 	char *t, *v, *u;
11 	Rune r;
12 	int c, n;
13 
14 	/* unescape */
15 	u = halloc(cc, strlen(s)+1);
16 	for(t = u; c = *s; s++){
17 		if(c == '%'){
18 			n = s[1];
19 			if(n >= '0' && n <= '9')
20 				n = n - '0';
21 			else if(n >= 'A' && n <= 'F')
22 				n = n - 'A' + 10;
23 			else if(n >= 'a' && n <= 'f')
24 				n = n - 'a' + 10;
25 			else
26 				break;
27 			r = n;
28 			n = s[2];
29 			if(n >= '0' && n <= '9')
30 				n = n - '0';
31 			else if(n >= 'A' && n <= 'F')
32 				n = n - 'A' + 10;
33 			else if(n >= 'a' && n <= 'f')
34 				n = n - 'a' + 10;
35 			else
36 				break;
37 			s += 2;
38 			c = (r<<4)+n;
39 		}
40 		*t++ = c;
41 	}
42 	*t = '\0';
43 
44 	/* convert to valid utf */
45 	v = halloc(cc, UTFmax*strlen(u) + 1);
46 	s = u;
47 	t = v;
48 	while(*s){
49 		/* in decoding error, assume latin1 */
50 		if((n=chartorune(&r, s)) == 1 && r == Runeerror)
51 			r = (uchar)*s;
52 		s += n;
53 		t += runetochar(t, &r);
54 	}
55 	*t = '\0';
56 
57 	return v;
58 }