Library supporting RFC2047: MIME Message Header Extensions

Decodes those funky strings you see in message (e.g. email) headers:
=?ISO-8859-1?Q?a?= =?ISO-8859-1?Q?b?=
=?UTF-8?B?UmVtaW5kZXI6IFdlc3Rlcm4gUml2ZXJzaWRlIENvdW50eSBDb21tdW5pdHkg?=

exec/load/mimehdr.js

+// $Id$
+
+// Support for RFC2047:
+//
+//        MIME (Multipurpose Internet Mail Extensions) Part Three:
+//              Message Header Extensions for Non-ASCII Text
+
+// Returns an array of 'encoded-words' 
+function decode(hvalue)
+{
+	var result = [];
+	
+	var list = hvalue.split(/\s+/);
+	for(var i in list) {
+		var str = list[i];
+		var retval = { charset: 'unspecified (US-ASCII)', data: str };
+
+		var match = str.match(/^\=\?([a-zA-Z0-9-]+)\?(.)\?([^ ?]+)\?\=$/);
+		if(!match) {
+			result.push(retval);
+			continue;
+		}
+		
+		retval.charset = match[1].toLowerCase();
+		switch(match[2].toLowerCase()) {
+			case 'q':	// Quoted-printable
+				retval.data = match[3].replace(/=([0-9A-F][0-9A-F])/g, function(str, p1) { return(ascii(parseInt(p1,16))); });
+				break;
+			case 'b':	// Base64
+				retval.data = base64_decode(match[3]);
+				break;
+		}
+		result.push(retval);
+	}
+	return result;
+}
+
+this;
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