1 files changed, 53 insertions, 0 deletions

diff --git a/src/util.cc b/src/util.cc
index 3166e62..48e486a 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -50,4 +50,57 @@ namespace kingate {
         }
         return rv;
     }
+
+    /*
+     * RFC 2616:
+     *
+     *        separators     = "(" | ")" | "<" | ">" | "@"
+     *                       | "," | ";" | ":" | "\" | <">
+     *                       | "/" | "[" | "]" | "?" | "="
+     *                       | "{" | "}" | SP | HT
+     */
+    
+    /*
+     * RFC 2616:
+     *
+     *        token          = 1*<any CHAR except CTLs or separators>
+     */
+
+    static const char *quotible_chars =
+        "\001\002\003\004\005\006\007\010"
+        "\011\012\013\014\015\016\017\020"
+        "\021\022\023\024\025\026\027\030"
+        "\031\032\033\034\035\036\037\040"
+        "()<>@,;:\\\"/[]?={}" /* separator chars (except for SP and HT mentioned elsewhere */
+        "\177"
+        ;
+
+    /*
+     * RFC 2616:
+     *
+     *        quoted-string  = ( <"> *(qdtext | quoted-pair ) <"> )
+     *        qdtext         = <any TEXT except <">>
+     *
+     *    The backslash character ("\") MAY be used as a single-character
+     *    quoting mechanism only within quoted-string and comment constructs.
+     *
+     *        quoted-pair    = "\" CHAR
+     */
+
+    string http_quoted_string(const string& str) {
+        string rv = str;
+        string::size_type sp=0;
+        for(string::size_type q=rv.find('"');(q=rv.find('"',q))!=string::npos;q+=2)
+            rv.insert(q,1,'\\');
+        rv.insert(0,1,'"');
+        rv += '"';
+        return rv;
+    }
+
+    string http_quote(const string& str) {
+        if(str.find_first_of(quotible_chars)==string::npos)
+            return str;
+        return http_quoted_string(str);
+    }
+
 }