Current Dev State

static/js/ketcher2/node_modules/ws/lib/BufferPool.js

@@ -0,0 +1,63 @@
+/*!
+ * ws: a node.js websocket client
+ * Copyright(c) 2011 Einar Otto Stangvik <einaros@gmail.com>
+ * MIT Licensed
+ */
+
+var util = require('util');
+
+function BufferPool(initialSize, growStrategy, shrinkStrategy) {
+  if (this instanceof BufferPool === false) {
+    throw new TypeError("Classes can't be function-called");
+  }
+
+  if (typeof initialSize === 'function') {
+    shrinkStrategy = growStrategy;
+    growStrategy = initialSize;
+    initialSize = 0;
+  }
+  else if (typeof initialSize === 'undefined') {
+    initialSize = 0;
+  }
+  this._growStrategy = (growStrategy || function(db, size) {
+    return db.used + size;
+  }).bind(null, this);
+  this._shrinkStrategy = (shrinkStrategy || function(db) {
+    return initialSize;
+  }).bind(null, this);
+  this._buffer = initialSize ? new Buffer(initialSize) : null;
+  this._offset = 0;
+  this._used = 0;
+  this._changeFactor = 0;
+  this.__defineGetter__('size', function(){
+    return this._buffer == null ? 0 : this._buffer.length;
+  });
+  this.__defineGetter__('used', function(){
+    return this._used;
+  });
+}
+
+BufferPool.prototype.get = function(length) {
+  if (this._buffer == null || this._offset + length > this._buffer.length) {
+    var newBuf = new Buffer(this._growStrategy(length));
+    this._buffer = newBuf;
+    this._offset = 0;
+  }
+  this._used += length;
+  var buf = this._buffer.slice(this._offset, this._offset + length);
+  this._offset += length;
+  return buf;
+}
+
+BufferPool.prototype.reset = function(forceNewBuffer) {
+  var len = this._shrinkStrategy();
+  if (len < this.size) this._changeFactor -= 1;
+  if (forceNewBuffer || this._changeFactor < -2) {
+    this._changeFactor = 0;
+    this._buffer = len ? new Buffer(len) : null;
+  }
+  this._offset = 0;
+  this._used = 0;
+}
+
+module.exports = BufferPool;