Node.JS Simple FTP Server

/// <reference path="typings/node.d.ts" />

var net = require('net');

var baseDire = '';

var srv = net.createServer(function(c) {
    c.setEncoding('utf8');

    console.log('Client connected : %s', c.remoteAddress);
    console.log('Awaiting authentication...');
    var packet;

    c.on('data', function (data) {
        console.log("Data received: ", data);

        var from = 0;

        while (true) {
            var start = data.indexOf('<', from),
                end = data.indexOf('>', from);

            // < ... >
            if (start != -1 && end != -1 && end > start) {
                packet = data.substring(start, end + 1);
                packetReceived(packet, c);
                from = end + 1;
            }

            // < ...
            else if(start != -1 && end == -1) {
                packet = data.substring(start, data.length);
                break;
            }

            // ... >
            // ... >< ... >
            else if ((start == -1 && end != -1) || end < start) {
                packet += data.substring(0, end + 1);
                from = end + 1;
                packetReceived(packet, c);
            }
            else {
                break;
            }
        }

        console.log('End of data event');
    });

    c.write('Welcome to D*****FTP server\r\n');

    c.on('end', function() {
        console.log('Client disconnected');
    });

});

srv.listen(8096, function () {
    console.log('Server bound');
});

//Must change to support multi user
var status;

var packetReceived = function (packet, socket) {
    if(!status) {
        //Login

        return;
    }

    switch (packet.cmd) {
        case 'upload':
            status = 'uploading';
            break;
        case 'download':

            break;
        case 'list':

            break;
    }

    console.log("Packet received: %s (%d)", packet, packet.length);
};

var readPacket = function (str) {
};