tiny ported to JavaScript

tiny.js

@@ -0,0 +1,84 @@
+/**
+ * Tiny.js
+ *
+ * A reversible base62 ID obfuscater
+ *
+ * Authors:
+ *   Jacob DeHart (original PHP version) and Kyle Bragger (Ruby port)
+ *   and Thorsten Basse (JavaScript port)
+ *
+ * Usage:
+ *   obfuscated_id = Tiny.toTiny(123)
+ *   original_id = Tiny.reverseTiny(obfuscated_id)
+ *
+ * Configuration:
+ *   You need to use Tiny.generateSet() to generate your own set
+ *   Do *not* change this once you start using Tiny, as you won't be able to Tiny.reverseTiny()
+ *   any values toTiny()'ed with another set.
+ *
+ */
+
+(function() { 
+  var root = this;
+  var set = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+  var warnDefaultSet = function() {
+    if( set === 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' ) console.warn('Tiny.js character set is still default. You need to generate your own.');
+  }
+  var range = function(low, high) {
+    var arr = [];
+    for( var i=low; i<=high; i++ ) {
+      arr.push(i);
+    };
+    return arr;
+  };
+  var Tiny = {
+    toTiny: function(id) {
+      warnDefaultSet();
+      var hex_n = '';
+      id = Math.floor(Math.abs(Number(id)));
+      var radix = set.length
+      while (true) {
+        var r = id % radix;
+        hex_n = set[r] + hex_n;
+        id = (id-r) / radix;
+        if( id === 0 ) {
+          break;
+        }
+      }
+      return hex_n;
+    },
+    reverseTiny: function(string) {
+      warnDefaultSet();
+      var radix = set.length;
+      var strlen = string.length;
+      var n = 0;
+      for( var i=0; i<strlen; i++) {
+        n += set.indexOf( string[i] ) * Math.pow(radix, (strlen-i-1) );
+      }
+      return n;
+    },
+    generateSet: function() {
+      var arr = [];
+      for( var i=65; i<=122; i++) {
+        if (i<91 || i>96) arr.push( String.fromCharCode(i) );
+      }
+      arr = arr.concat(range(0, 9));
+      arr.sort( function() { return 0.5 - Math.random(); } ) // shuffle array
+      return arr.join('');
+    }
+  }
+
+  if (typeof exports !== 'undefined') {
+   if (typeof module !== 'undefined' && module.exports) {
+     exports = module.exports = Tiny;
+   }
+   exports = Tiny;
+  } else if (typeof define === 'function' && define.amd) {
+   define('Tiny', function() {
+     return Tiny;
+   });
+  } else {
+   root['Tiny'] = Tiny;
+  }
+
+})();