Handle %xx encoding in querystring

Convert valid %xx expressions in querystring to ascii, ignore invalid
expressions (i.e. eat the three characters %xx).

Signed-off-by: Lars Hjemli <larsh@hal-2004.(none)>

1 files changed, 21 insertions, 0 deletions

diff --git a/parsing.c b/parsing.c
index 1b22fcf..4173dd4 100644
--- a/parsing.c
+++ b/parsing.c
@@ -79,6 +79,25 @@ int cgit_read_config(const char *filename, configfn fn)
 	return ret;
 }
 
+char *convert_query_hexchar(char *txt)
+{
+	int d1, d2;
+	if (strlen(txt) < 3) {
+		*txt = '\0';
+		return txt-1;
+	}
+	d1 = hextoint(*(txt+1));
+	d2 = hextoint(*(txt+2));
+	if (d1<0 || d2<0) {
+		strcpy(txt, txt+3);
+		return txt-1;
+	} else {
+		*txt = d1 * 16 + d2;
+		strcpy(txt+1, txt+3);
+		return txt;
+	}
+}
+
 int cgit_parse_query(char *txt, configfn fn)
 {
 	char *t, *value = NULL, c;
@@ -94,6 +113,8 @@ int cgit_parse_query(char *txt, configfn fn)
 			value = t+1;
 		} else if (c=='+') {
 			*t = ' ';
+		} else if (c=='%') {
+			t = convert_query_hexchar(t);
 		} else if (c=='&') {
 			*t = '\0';
 			(*fn)(txt, value);