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/*
server side js functions for encoding/decoding objects into linear strings
Copyright Andrew Tridgell 2005
released under the GNU GPL Version 2 or later
*/
/*
usage:
enc = encodeObject(obj);
obj = decodeObject(enc);
The encoded format of the object is a string that is safe to
use in URLs
Note that only data elements are encoded, not functions
*/
function __count_members(o) {
var i, count = 0;
for (i in o) {
count++;
}
if (o.length != undefined) {
count++;
}
return count;
}
function __replace(str, old, rep) {
var s = string_init();
var a = s.split(old, str);
var j = s.join(rep, a);
return s.join(rep, a);
}
function encodeElement(e, name) {
var t = typeof(e);
var r;
var s = string_init();
if (t == 'object' && e == null) {
t = 'null';
}
if (t == 'object') {
r = s.sprintf("%s:%s:%s", name, t, encodeObject(e));
} else if (t == "string") {
var enc = s.encodeURIComponent(e);
var rep = __replace(enc, '%', '#');
r = s.sprintf("%s:%s:%s:",
name, t, __replace(s.encodeURIComponent(e),'%','#'));
} else if (t == "boolean" || t == "number") {
r = s.sprintf("%s:%s:%s:", name, t, "" + e);
} else if (t == "undefined" || t == "null") {
r = s.sprintf("%s:%s:", name, t);
} else if (t == "pointer") {
r = s.sprintf("%s:string:(POINTER):", name);
} else {
println("Unable to linearise type " + t);
r = "";
}
return r;
}
function encodeObject(o) {
var s = string_init();
var i, r = s.sprintf("%u:", __count_members(o));
for (i in o) {
r = r + encodeElement(o[i], i);
}
if (o.length != undefined) {
r = r + encodeElement(o.length, 'length');
}
return r;
}
function decodeObjectArray(a) {
var s = string_init();
var o = new Object();
var i, count = a[a.i]; a.i++;
for (i=0;i<count;i++) {
var name = a[a.i]; a.i++;
var type = a[a.i]; a.i++;
var value;
if (type == 'object') {
o[name] = decodeObjectArray(a);
} else if (type == "string") {
value = s.decodeURIComponent(__replace(a[a.i],'#','%')); a.i++;
o[name] = value;
} else if (type == "boolean") {
value = a[a.i]; a.i++;
if (value == 'true') {
o[name] = true;
} else {
o[name] = false;
}
} else if (type == "undefined") {
o[name] = undefined;
} else if (type == "null") {
o[name] = null;
} else if (type == "number") {
value = a[a.i]; a.i++;
o[name] = value + 0;
} else {
println("Unable to delinearise type " + t);
assert(t == "supported type");
}
}
return o;
}
function decodeObject(str) {
var s = string_init();
var a = s.split(':', str);
a.i = 0;
return decodeObjectArray(a);
}
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