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shrine-medco/shrine-webclient/src/main/html/node_modules/ws/lib/Receiver.hixie.js
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Receiver.hixie.js
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			/*!
			* 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;
			}