--- /dev/null
+'use strict';
+
+var util = require("util");
+
+function toString(val) {
+ val = val.toString(8);
+ while (val.length < 4) {
+ val = "0" + val;
+ }
+ return val;
+}
+
+var defaultUmask = 18; // 0022;
+var defaultUmaskString = toString(defaultUmask);
+
+function validate(data, k, val) {
+ // must be either an integer or an octal string.
+ if (typeof val === "number" && !isNaN(val)) {
+ data[k] = val;
+ return true;
+ }
+
+ if (typeof val === "string") {
+ if (val.charAt(0) !== "0") {
+ return false;
+ }
+ data[k] = parseInt(val, 8);
+ return true;
+ }
+
+ return false;
+}
+
+function convert_fromString(val, cb) {
+ if (typeof val === "string") {
+ // check for octal string first
+ if (val.charAt(0) === '0' && /^[0-7]+$/.test(val)) {
+ val = parseInt(val, 8);
+ } else if (val.charAt(0) !== '0' && /^[0-9]+$/.test(val)) {
+ // legacy support for decimal strings
+ val = parseInt(val, 10);
+ } else {
+ return cb(new Error(util.format("Expected octal string, got %j, defaulting to %j",
+ val, defaultUmaskString)),
+ defaultUmask);
+ }
+ } else if (typeof val !== "number") {
+ return cb(new Error(util.format("Expected number or octal string, got %j, defaulting to %j",
+ val, defaultUmaskString)),
+ defaultUmask);
+ }
+
+ val = Math.floor(val);
+
+ if ((val < 0) || (val > 511)) {
+ return cb(new Error(util.format("Must be in range 0..511 (0000..0777), got %j", val)),
+ defaultUmask);
+ }
+
+ cb(null, val);
+}
+
+function fromString(val, cb) {
+
+ // synchronous callback, no zalgo
+ convert_fromString(val, cb || function (err, result) {
+ /*jslint unparam:true*/
+ val = result;
+ });
+
+ return val;
+}
+
+exports.toString = toString;
+exports.fromString = fromString;
+exports.validate = validate;
+