1 files changed, 69 insertions, 0 deletions
diff --git a/js/dojo-1.6/dojox/math/random/prng4.js b/js/dojo-1.6/dojox/math/random/prng4.js
new file mode 100644
index 0000000..c180368
--- /dev/null
+++ b/js/dojo-1.6/dojox/math/random/prng4.js
@@ -0,0 +1,69 @@
+/*
+	Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
+	Available via Academic Free License >= 2.1 OR the modified BSD license.
+	see: http://dojotoolkit.org/license for details
+*/
+
+
+if(!dojo._hasResource["dojox.math.random.prng4"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
+dojo._hasResource["dojox.math.random.prng4"] = true;
+dojo.provide("dojox.math.random.prng4");
+
+
+dojo.getObject("math.random.prng4", true, dojox);
+
+// Copyright (c) 2005  Tom Wu
+// All Rights Reserved.
+// See "LICENSE-BigInteger" for details.
+
+(function(){
+	// prng4.js - uses Arcfour as a PRNG
+
+	function Arcfour() {
+		this.i = 0;
+		this.j = 0;
+		this.S = new Array(256);
+	}
+
+	dojo.extend(Arcfour, {
+		init: function(key){
+			// summary:
+			//	Initialize arcfour context
+			// key: Array:
+			//	an array of ints, each from [0..255]
+			var i, j, t, S = this.S, len = key.length;
+			for(i = 0; i < 256; ++i){
+				S[i] = i;
+			}
+			j = 0;
+			for(i = 0; i < 256; ++i){
+				j = (j + S[i] + key[i % len]) & 255;
+				t = S[i];
+				S[i] = S[j];
+				S[j] = t;
+			}
+			this.i = 0;
+			this.j = 0;
+		},
+
+		next: function(){
+			var t, i, j, S = this.S;
+			this.i = i = (this.i + 1) & 255;
+			this.j = j = (this.j + S[i]) & 255;
+			t = S[i];
+			S[i] = S[j];
+			S[j] = t;
+			return S[(t + S[i]) & 255];
+		}
+	});
+
+	dojox.math.random.prng4 = function(){
+		return new Arcfour();
+	};
+
+	// Pool size must be a multiple of 4 and greater than 32.
+	// An array of bytes the size of the pool will be passed to init()
+	dojox.math.random.prng4.size = 256;
+})();
+
+}