Current Dev State

static/js/ketcher2/node_modules/ws/lib/Receiver.hixie.js

@@ -0,0 +1,194 @@
+/*!
+ * ws: a node.js websocket client
+ * Copyright(c) 2011 Einar Otto Stangvik <einaros@gmail.com>
+ * MIT Licensed
+ */
+
+var util = require('util');
+
+/**
+ * State constants
+ */
+
+var EMPTY = 0
+  , BODY = 1;
+var BINARYLENGTH = 2
+  , BINARYBODY = 3;
+
+/**
+ * Hixie Receiver implementation
+ */
+
+function Receiver () {
+  if (this instanceof Receiver === false) {
+    throw new TypeError("Classes can't be function-called");
+  }
+
+  this.state = EMPTY;
+  this.buffers = [];
+  this.messageEnd = -1;
+  this.spanLength = 0;
+  this.dead = false;
+
+  this.onerror = function() {};
+  this.ontext = function() {};
+  this.onbinary = function() {};
+  this.onclose = function() {};
+  this.onping = function() {};
+  this.onpong = function() {};
+}
+
+module.exports = Receiver;
+
+/**
+ * Add new data to the parser.
+ *
+ * @api public
+ */
+
+Receiver.prototype.add = function(data) {
+  if (this.dead) return;
+  var self = this;
+  function doAdd() {
+    if (self.state === EMPTY) {
+      if (data.length == 2 && data[0] == 0xFF && data[1] == 0x00) {
+        self.reset();
+        self.onclose();
+        return;
+      }
+      if (data[0] === 0x80) {
+        self.messageEnd = 0;
+        self.state = BINARYLENGTH;
+        data = data.slice(1);
+      } else {
+
+      if (data[0] !== 0x00) {
+        self.error('payload must start with 0x00 byte', true);
+        return;
+      }
+      data = data.slice(1);
+      self.state = BODY;
+
+      }
+    }
+    if (self.state === BINARYLENGTH) {
+      var i = 0;
+      while ((i < data.length) && (data[i] & 0x80)) {
+        self.messageEnd = 128 * self.messageEnd + (data[i] & 0x7f);
+        ++i;
+      }
+      if (i < data.length) {
+        self.messageEnd = 128 * self.messageEnd + (data[i] & 0x7f);
+        self.state = BINARYBODY;
+        ++i;
+      }
+      if (i > 0)
+        data = data.slice(i);
+    }
+    if (self.state === BINARYBODY) {
+      var dataleft = self.messageEnd - self.spanLength;
+      if (data.length >= dataleft) {
+        // consume the whole buffer to finish the frame
+        self.buffers.push(data);
+        self.spanLength += dataleft;
+        self.messageEnd = dataleft;
+        return self.parse();
+      }
+      // frame's not done even if we consume it all
+      self.buffers.push(data);
+      self.spanLength += data.length;
+      return;
+    }
+    self.buffers.push(data);
+    if ((self.messageEnd = bufferIndex(data, 0xFF)) != -1) {
+      self.spanLength += self.messageEnd;
+      return self.parse();
+    }
+    else self.spanLength += data.length;
+  }
+  while(data) data = doAdd();
+};
+
+/**
+ * Releases all resources used by the receiver.
+ *
+ * @api public
+ */
+
+Receiver.prototype.cleanup = function() {
+  this.dead = true;
+  this.state = EMPTY;
+  this.buffers = [];
+};
+
+/**
+ * Process buffered data.
+ *
+ * @api public
+ */
+
+Receiver.prototype.parse = function() {
+  var output = new Buffer(this.spanLength);
+  var outputIndex = 0;
+  for (var bi = 0, bl = this.buffers.length; bi < bl - 1; ++bi) {
+    var buffer = this.buffers[bi];
+    buffer.copy(output, outputIndex);
+    outputIndex += buffer.length;
+  }
+  var lastBuffer = this.buffers[this.buffers.length - 1];
+  if (this.messageEnd > 0) lastBuffer.copy(output, outputIndex, 0, this.messageEnd);
+  if (this.state !== BODY) --this.messageEnd;
+  var tail = null;
+  if (this.messageEnd < lastBuffer.length - 1) {
+    tail = lastBuffer.slice(this.messageEnd + 1);
+  }
+  this.reset();
+  this.ontext(output.toString('utf8'));
+  return tail;
+};
+
+/**
+ * Handles an error
+ *
+ * @api private
+ */
+
+Receiver.prototype.error = function (reason, terminate) {
+  if (this.dead) return;
+  this.reset();
+  if(typeof reason == 'string'){
+    this.onerror(new Error(reason), terminate);
+  }
+  else if(reason.constructor == Error){
+    this.onerror(reason, terminate);
+  }
+  else{
+    this.onerror(new Error("An error occured"),terminate);
+  }
+  return this;
+};
+
+/**
+ * Reset parser state
+ *
+ * @api private
+ */
+
+Receiver.prototype.reset = function (reason) {
+  if (this.dead) return;
+  this.state = EMPTY;
+  this.buffers = [];
+  this.messageEnd = -1;
+  this.spanLength = 0;
+};
+
+/**
+ * Internal api
+ */
+
+function bufferIndex(buffer, byte) {
+  for (var i = 0, l = buffer.length; i < l; ++i) {
+    if (buffer[i] === byte) return i;
+  }
+  return -1;
+}