08-27-周三_17-09-29

node_modules/faye-websocket/lib/faye/websocket/draft75_parser.js

@@ -0,0 +1,98 @@
+var Draft75Parser = function(webSocket) {
+  this._socket = webSocket;
+  this._stage  = 0;
+};
+
+var instance = {
+  getVersion: function() {
+    return 'hixie-75';
+  },
+
+  handshakeResponse: function() {
+    return new Buffer('HTTP/1.1 101 Web Socket Protocol Handshake\r\n' +
+                      'Upgrade: WebSocket\r\n' +
+                      'Connection: Upgrade\r\n' +
+                      'WebSocket-Origin: ' + this._socket.request.headers.origin + '\r\n' +
+                      'WebSocket-Location: ' + this._socket.url + '\r\n\r\n',
+                      'utf8');
+  },
+
+  isOpen: function() {
+    return true;
+  },
+
+  parse: function(buffer) {
+    var data, message, value;
+    for (var i = 0, n = buffer.length; i < n; i++) {
+      data = buffer[i];
+
+      switch (this._stage) {
+        case 0:
+          this._parseLeadingByte(data);
+          break;
+
+        case 1:
+          value = (data & 0x7F);
+          this._length = value + 128 * this._length;
+
+          if (this._closing && this._length === 0) {
+            this._socket.close(null, null, false);
+          }
+          else if ((0x80 & data) !== 0x80) {
+            if (this._length === 0) {
+              this._socket.receive('');
+              this._stage = 0;
+            }
+            else {
+              this._buffer = [];
+              this._stage = 2;
+            }
+          }
+          break;
+
+        case 2:
+          if (data === 0xFF) {
+            message = new Buffer(this._buffer);
+            this._socket.receive(message.toString('utf8', 0, this._buffer.length));
+            this._stage = 0;
+          }
+          else {
+            this._buffer.push(data);
+            if (this._length && this._buffer.length === this._length)
+              this._stage = 0;
+          }
+          break;
+      }
+    }
+  },
+
+  _parseLeadingByte: function(data) {
+    if ((0x80 & data) === 0x80) {
+      this._length = 0;
+      this._stage = 1;
+    } else {
+      delete this._length;
+      this._buffer = [];
+      this._stage = 2;
+    }
+  },
+
+  frame: function(data) {
+    if (Buffer.isBuffer(data)) return data;
+
+    var buffer = new Buffer(data, 'utf8'),
+        frame  = new Buffer(buffer.length + 2);
+
+    frame[0] = 0x00;
+    frame[buffer.length + 1] = 0xFF;
+    buffer.copy(frame, 1);
+
+    return frame;
+  }
+};
+
+for (var key in instance)
+  Draft75Parser.prototype[key] = instance[key];
+
+module.exports = Draft75Parser;
+