TLV-Handler.js

exports.encodeTLV = function (type,data) {
	
	var encodedTLVBuffer = Buffer(0);

	if (data.length <= 255) {
		encodedTLVBuffer = Buffer.concat([Buffer([type,data.length]),data]);
	} else {
		var leftLength = data.length;
		var tempBuffer = Buffer(0);
		var currentStart = 0;

		for (; leftLength > 0;) {
			if (leftLength >= 255) {
				tempBuffer = Buffer.concat([tempBuffer,Buffer([type,0xFF]),data.slice(currentStart, currentStart + 255)]);
				leftLength -= 255;
				currentStart = currentStart + 255;
			} else {
				tempBuffer = Buffer.concat([tempBuffer,Buffer([type,leftLength]),data.slice(currentStart, currentStart + leftLength)]);
				leftLength -= leftLength;
			}
		};

		encodedTLVBuffer = tempBuffer;
	}

	return encodedTLVBuffer;
}

exports.decodeTLV = function (data) {

	var objects = {};

	var leftLength = data.length;
	var currentIndex = 0;

	for (; leftLength > 0;) {
		var type = data[currentIndex]
		var length = data[currentIndex+1]
		currentIndex += 2;
		leftLength -= 2;

		var newData = data.slice(currentIndex, currentIndex+length);

		if (objects[type]) {
			objects[type] = Buffer.concat([objects[type],newData]);
		} else {
			objects[type] = newData;
		}

		currentIndex += length;
		leftLength -= length;
	};

	return objects;
}