1 files changed, 71 insertions, 0 deletions
diff --git a/js/dojo-1.7.2/dojox/encoding/compression/splay.js b/js/dojo-1.7.2/dojox/encoding/compression/splay.js
new file mode 100644
index 0000000..45ebe6d
--- /dev/null
+++ b/js/dojo-1.7.2/dojox/encoding/compression/splay.js
@@ -0,0 +1,71 @@
+//>>built
+define("dojox/encoding/compression/splay", [
+	"dojo/_base/lang",	// dojo.extend
+	"../bits"
+], function(lang, bits) {
+	var compression = lang.getObject("dojox.encoding.compression", true);
+	/*=====
+		compression = dojox.encoding.compression;
+	=====*/
+
+	compression.Splay = function(n){
+		this.up = new Array(2 * n + 1);
+		this.left = new Array(n);
+		this.right = new Array(n);
+		this.reset();
+	};
+
+	lang.extend(compression.Splay, {
+		reset: function(){
+			for(var i = 1; i < this.up.length; this.up[i] = Math.floor((i - 1) / 2), ++i);
+			for(var i = 0; i < this.left.length; this.left[i] = 2 * i + 1, this.right[i] = 2 * i + 2, ++i);
+		},
+		splay: function(i){
+			var a = i + this.left.length;
+			do{
+				var c = this.up[a];
+				if(c){	// root
+					// rotated pair
+					var d = this.up[c];
+					// swap descendants
+					var b = this.left[d];
+					if(c == b){
+						b = this.right[d];
+						this.right[d] = a;
+					} else {
+						this.left[d] = a;
+					}
+					this[a == this.left[c] ? "left" : "right"][c] = b;
+					this.up[a] = d;
+					this.up[b] = c;
+					a = d;
+				}else{
+					a = c;
+				}
+			}while(a);	// root
+		},
+		encode: function(value, stream){
+			var s = [], a = value + this.left.length;
+			do{
+				s.push(this.right[this.up[a]] == a);
+				a = this.up[a];
+			}while(a);	// root
+			this.splay(value);
+			var l = s.length;
+			while(s.length){ stream.putBits(s.pop() ? 1 : 0, 1); }
+			return	l;
+		},
+		decode: function(stream){
+			var a = 0;	// root;
+			do{
+				a = this[stream.getBits(1) ? "right" : "left"][a];
+			}while(a < this.left.length);
+			a -= this.left.length;
+			this.splay(a);
+			return	a;
+		}
+	});
+
+
+	return compression.Splay;
+});