# Code coverage report for lib/readable_streambuffer.js

## Statements: 98.82% (84 / 85) Branches: 94.34% (50 / 53) Functions: 100% (11 / 11) Lines: 100% (83 / 83) Ignored: none

All files » lib/ » readable_streambuffer.js

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     var stream = require("stream"),
    	constants = require("./constants"),
    	util = require("util");

    var ReadableStreamBuffer = module.exports = function(opts) {
    	var that = this;

    	stream.Stream.call(this);

    	opts = opts || {};
    	var frequency = opts.hasOwnProperty("frequency") ? opts.frequency : constants.DEFAULT_FREQUENCY;
    	var chunkSize = opts.chunkSize || constants.DEFAULT_CHUNK_SIZE;
    	var initialSize = opts.initialSize || constants.DEFAULT_INITIAL_SIZE;
    	var incrementAmount = opts.incrementAmount || constants.DEFAULT_INCREMENT_AMOUNT;

    	var size = 0;
    	var buffer = new Buffer(initialSize);
    	var encoding = null;

    	this.readable = true;
    	this.writable = false;

    	var sendData = function() {
    		var amount = Math.min(chunkSize, size);

    		if (amount > 0) {
    			var chunk = null;
    			if(encoding) {
    				chunk = buffer.toString(encoding, 0, amount);
    			}
    			else {
    				chunk = new Buffer(amount);
    				buffer.copy(chunk, 0, 0, amount);
    			}

    			that.emit("data", chunk);

    			Eif(amount < buffer.length)
    				buffer.copy(buffer, 0, amount, size);
    			size -= amount;
    		}

    		if(size === 0 && !that.readable) {
    			that.emit("end");
    			that.emit("close");
    			if (sendData && sendData.interval) {
    				clearInterval(sendData.interval);
    				sendData.interval = null;
    			}
    		}
    	};

    	this.size = function() {
    		return size;
    	};

    	this.maxSize = function() {
    		return buffer.length;
    	};

    	var increaseBufferIfNecessary = function(incomingDataSize) {
    		if((buffer.length - size) < incomingDataSize) {
    			var factor = Math.ceil((incomingDataSize - (buffer.length - size)) / incrementAmount);

    			var newBuffer = new Buffer(buffer.length + (incrementAmount * factor));
    			buffer.copy(newBuffer, 0, 0, size);
    			buffer = newBuffer;
    		}
    	};

    	this.put = function(data, encoding) {
    		Iif(!that.readable) return;

    		var wasEmpty = size === 0;
    		if(Buffer.isBuffer(data)) {
    			increaseBufferIfNecessary(data.length);
    			data.copy(buffer, size, 0);
    			size += data.length;
    		}
    		else {
    			data = data + "";
    			var dataSizeInBytes = Buffer.byteLength(data);
    			increaseBufferIfNecessary(dataSizeInBytes);
    			buffer.write(data, size, encoding || "utf8");
    			size += dataSizeInBytes;
    		}

    		if (wasEmpty && size > 0) {
    			this.emit('readable')
    		}

    		if (!this.isPaused && !frequency) {
    			while (size > 0) {
    				sendData();
    			}
    		}
    	};

    	this.pause = function() {
    		this.isPaused = true;
    		Eif(sendData && sendData.interval) {
    			clearInterval(sendData.interval);
    			delete sendData.interval;
    		}
    	};

    	this.resume = function() {
    		this.isPaused = false;
    		if(sendData && !sendData.interval && frequency > 0) {
    			sendData.interval = setInterval(sendData, frequency);
    		}
    	};

    	this.destroy = function() {
    		that.emit("end");
    		if(sendData.interval) clearInterval(sendData.interval);
    		sendData = null;
    		that.readable = false;
    		that.emit("close");
    	};

    	this.destroySoon = function() {
    		that.readable = false;
    		if (!sendData.interval) {
    			that.emit("end");
    			that.emit("close");
    		}
    	};

    	this.setEncoding = function(_encoding) {
    		encoding = _encoding;
    	};

    	this.resume();
    };
    util.inherits(ReadableStreamBuffer, stream.Stream);