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				+using System; 
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				+using System.Collections.Generic; 
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				+using System.Linq; 
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				+using System.Text; 
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				+using System.Text.RegularExpressions; 
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				+using System.Threading; 
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				+using System.Threading.Tasks; 
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				+using MediaBrowser.Model.Net; 
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				+ 
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				+namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun 
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				+{ 
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				+    public interface IHdHomerunChannelCommands 
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				+    { 
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				+        IEnumerable<Tuple<string, string>> GetCommands(); 
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				+    } 
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				+ 
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				+    public class LegacyHdHomerunChannelCommands : IHdHomerunChannelCommands 
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				+    { 
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				+        private string _channel; 
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				+        private string _program; 
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				+        public LegacyHdHomerunChannelCommands(string url) 
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				+        { 
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				+            // parse url for channel and program 
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				+            var regExp = new Regex(@"\/ch(\d+)-?(\d*)"); 
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				+            var match = regExp.Match(url); 
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				+            if (match.Success) 
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				+            { 
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				+                _channel = match.Groups[1].Value; 
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				+                _program = match.Groups[2].Value; 
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				+            } 
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				+        } 
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				+ 
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				+        public IEnumerable<Tuple<string, string>> GetCommands() 
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				+        { 
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				+            var commands = new List<Tuple<string, string>>(); 
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				+ 
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				+            if (!String.IsNullOrEmpty(_channel)) 
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				+                commands.Add(Tuple.Create("channel", _channel)); 
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				+ 
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				+            if (!String.IsNullOrEmpty(_program)) 
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				+                commands.Add(Tuple.Create("program", _program)); 
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				+            return commands; 
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				+        } 
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				+    } 
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				+ 
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				+    public class HdHomerunChannelCommands : IHdHomerunChannelCommands 
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				+    { 
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				+        private string _channel; 
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				+ 
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				+        public HdHomerunChannelCommands(string channel) 
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				+        { 
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				+            _channel = channel; 
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				+        } 
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				+ 
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				+        public IEnumerable<Tuple<string, string>> GetCommands() 
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				+        { 
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				+            var commands = new List<Tuple<string, string>>(); 
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				+ 
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				+            if (!String.IsNullOrEmpty(_channel)) 
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				+                commands.Add(Tuple.Create("vchannel", _channel)); 
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				+ 
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				+            return commands; 
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				+        } 
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				+    } 
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				+ 
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				+    public class HdHomerunManager : IDisposable 
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				+    { 
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				+        public static int HdHomeRunPort = 65001; 
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				+        // Message constants 
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				+        private static byte GetSetName = 3; 
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				+        private static byte GetSetValue = 4; 
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				+        private static byte GetSetLockkey = 21; 
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				+        private static ushort GetSetRequest = 4; 
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				+        private static ushort GetSetReply = 5; 
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				+ 
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				+        private uint? _lockkey = null; 
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				+        private int _activeTuner = 0; 
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				+        private readonly ISocketFactory _socketFactory; 
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				+        private IpAddressInfo _remoteIp; 
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				+ 
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				+        public HdHomerunManager(ISocketFactory socketFactory) 
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				+        { 
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				+            _socketFactory = socketFactory; 
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				+        } 
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				+ 
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				+        public void Dispose() 
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				+        { 
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				+            var task = StopStreaming(); 
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				+ 
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				+            Task.WaitAll(task); 
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				+        } 
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				+ 
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				+        public async Task<bool> CheckTunerAvailability(IpAddressInfo remoteIp, int tuner, CancellationToken cancellationToken) 
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				+        { 
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				+            using (var socket = _socketFactory.CreateTcpSocket(remoteIp, HdHomeRunPort)) 
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				+            { 
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				+                return await CheckTunerAvailability(socket, remoteIp, tuner, cancellationToken).ConfigureAwait(false); 
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				+            } 
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				+        } 
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				+ 
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				+        private async Task<bool> CheckTunerAvailability(ISocket socket, IpAddressInfo remoteIp, int tuner, CancellationToken cancellationToken) 
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				+        { 
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				+            var ipEndPoint = new IpEndPointInfo(remoteIp, HdHomeRunPort); 
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				+ 
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				+            var lockkeyMsg = CreateGetMessage(tuner, "lockkey"); 
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				+            await socket.SendAsync(lockkeyMsg, lockkeyMsg.Length, ipEndPoint, cancellationToken); 
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				+            var response = await socket.ReceiveAsync(cancellationToken).ConfigureAwait(false); 
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				+            string returnVal; 
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				+            ParseReturnMessage(response.Buffer, response.ReceivedBytes, out returnVal); 
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				+ 
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				+            return string.Equals(returnVal, "none", StringComparison.OrdinalIgnoreCase); 
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				+        } 
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				+ 
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				+        public async Task StartStreaming(IpAddressInfo remoteIp, IpAddressInfo localIp, int localPort, IHdHomerunChannelCommands commands, int numTuners, CancellationToken cancellationToken) 
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				+        { 
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				+            _remoteIp = remoteIp; 
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				+             
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				+            using (var tcpClient = _socketFactory.CreateTcpSocket(_remoteIp, HdHomeRunPort)) 
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				+            { 
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				+                if (!_lockkey.HasValue) 
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				+                { 
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				+                    var rand = new Random(); 
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				+                    _lockkey = (uint)rand.Next(); 
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				+                } 
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				+ 
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				+                var ipEndPoint = new IpEndPointInfo(_remoteIp, HdHomeRunPort); 
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				+ 
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				+                for (int i = 0; i < numTuners; ++i) 
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				+                { 
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				+                    if (!await CheckTunerAvailability(tcpClient, _remoteIp, i, cancellationToken).ConfigureAwait(false)) 
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				+                        continue; 
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				+ 
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				+                    _activeTuner = i; 
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				+                    var lockKeyString = String.Format("{0:d}", _lockkey.Value); 
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				+                    var lockkeyMsg = CreateSetMessage(i, "lockkey", lockKeyString, null); 
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				+                    await tcpClient.SendAsync(lockkeyMsg, lockkeyMsg.Length, ipEndPoint, cancellationToken).ConfigureAwait(false); 
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				+                    var response = await tcpClient.ReceiveAsync(cancellationToken).ConfigureAwait(false); 
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				+                    string returnVal; 
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				+                    // parse response to make sure it worked 
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				+                    if (!ParseReturnMessage(response.Buffer, response.ReceivedBytes, out returnVal)) 
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				+                        continue; 
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				+ 
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				+                    var commandList = commands.GetCommands(); 
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				+                    foreach(Tuple<string,string> command in commandList) 
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				+                    { 
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				+                        var channelMsg = CreateSetMessage(i, command.Item1, command.Item2, _lockkey.Value); 
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				+                        await tcpClient.SendAsync(channelMsg, channelMsg.Length, ipEndPoint, cancellationToken).ConfigureAwait(false); 
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				+                        response = await tcpClient.ReceiveAsync(cancellationToken).ConfigureAwait(false); 
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				+                        // parse response to make sure it worked 
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				+                        if (!ParseReturnMessage(response.Buffer, response.ReceivedBytes, out returnVal)) 
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				+                        { 
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				+                            await ReleaseLockkey(tcpClient).ConfigureAwait(false); 
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				+                            continue; 
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				+                        } 
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				+ 
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				+                    } 
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				+                     
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				+                    var targetValue = String.Format("rtp://{0}:{1}", localIp, localPort); 
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				+                    var targetMsg = CreateSetMessage(i, "target", targetValue, _lockkey.Value); 
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				+ 
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				+                    await tcpClient.SendAsync(targetMsg, targetMsg.Length, ipEndPoint, cancellationToken).ConfigureAwait(false); 
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				+                    response = await tcpClient.ReceiveAsync(cancellationToken).ConfigureAwait(false); 
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				+                    // parse response to make sure it worked 
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				+                    if (!ParseReturnMessage(response.Buffer, response.ReceivedBytes, out returnVal)) 
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				+                    { 
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				+                        await ReleaseLockkey(tcpClient).ConfigureAwait(false); 
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				+                        continue; 
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				+                    } 
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				+ 
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				+                    break; 
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				+                } 
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				+            } 
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				+        } 
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				+ 
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				+        public async Task ChangeChannel(IHdHomerunChannelCommands commands, CancellationToken cancellationToken) 
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				+        { 
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				+            if (!_lockkey.HasValue) 
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				+                return; 
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				+ 
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				+            using (var tcpClient = _socketFactory.CreateTcpSocket(_remoteIp, HdHomeRunPort)) 
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				+            { 
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				+                var commandList = commands.GetCommands(); 
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				+                foreach (Tuple<string, string> command in commandList) 
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				+                { 
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				+                    var channelMsg = CreateSetMessage(_activeTuner, command.Item1, command.Item2, _lockkey.Value); 
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				+                    await tcpClient.SendAsync(channelMsg, channelMsg.Length, new IpEndPointInfo(_remoteIp, HdHomeRunPort), cancellationToken).ConfigureAwait(false); 
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				+                    var response = await tcpClient.ReceiveAsync(cancellationToken).ConfigureAwait(false); 
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				+                    // parse response to make sure it worked 
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				+                    string returnVal; 
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				+                    if (!ParseReturnMessage(response.Buffer, response.ReceivedBytes, out returnVal)) 
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				+                    { 
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				+                        return; 
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				+                    } 
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				+                } 
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				+            } 
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				+        } 
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				+ 
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				+        public async Task StopStreaming() 
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				+        { 
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				+            if (!_lockkey.HasValue) 
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				+                return; 
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				+ 
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				+            using (var socket = _socketFactory.CreateTcpSocket(_remoteIp, HdHomeRunPort)) 
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				+            { 
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				+                await ReleaseLockkey(socket).ConfigureAwait(false); 
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				+            } 
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				+        } 
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				+ 
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				+        private async Task ReleaseLockkey(ISocket tcpClient) 
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				+        { 
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				+            var releaseTarget = CreateSetMessage(_activeTuner, "target", "none", _lockkey); 
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				+            await tcpClient.SendAsync(releaseTarget, releaseTarget.Length, new IpEndPointInfo(_remoteIp, HdHomeRunPort), CancellationToken.None).ConfigureAwait(false); 
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				+            await tcpClient.ReceiveAsync(CancellationToken.None).ConfigureAwait(false); 
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				+            var releaseKeyMsg = CreateSetMessage(_activeTuner, "lockkey", "none", _lockkey); 
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				+            _lockkey = null; 
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				+            await tcpClient.SendAsync(releaseKeyMsg, releaseKeyMsg.Length, new IpEndPointInfo(_remoteIp, HdHomeRunPort), CancellationToken.None).ConfigureAwait(false); 
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				+            await tcpClient.ReceiveAsync(CancellationToken.None).ConfigureAwait(false); 
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				+        } 
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				+ 
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				+        private static byte[] CreateGetMessage(int tuner, string name) 
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				+        { 
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				+            var byteName = Encoding.UTF8.GetBytes(String.Format("/tuner{0}/{1}\0", tuner, name)); 
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				+            int messageLength = byteName.Length + 10; // 4 bytes for header + 4 bytes for crc + 2 bytes for tag name and length 
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				+ 
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				+            var message = new byte[messageLength]; 
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				+ 
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				+            int offset = InsertHeaderAndName(byteName, messageLength, message); 
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				+ 
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				+            bool flipEndian = BitConverter.IsLittleEndian; 
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				+ 
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				+            // calculate crc and insert at the end of the message 
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				+            var crcBytes = BitConverter.GetBytes(HdHomerunCrc.GetCrc32(message, messageLength - 4)); 
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				+            if (flipEndian) 
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				+                Array.Reverse(crcBytes); 
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				+            Buffer.BlockCopy(crcBytes, 0, message, offset, 4); 
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				+ 
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				+            return message; 
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				+        } 
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				+ 
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				+        private static byte[] CreateSetMessage(int tuner, String name, String value, uint? lockkey) 
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				+        { 
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				+            var byteName = Encoding.UTF8.GetBytes(String.Format("/tuner{0}/{1}\0", tuner, name)); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var byteValue = Encoding.UTF8.GetBytes(String.Format("{0}\0", value)); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            int messageLength = byteName.Length + byteValue.Length + 12; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            if (lockkey.HasValue) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                messageLength += 6; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var message = new byte[messageLength]; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            int offset = InsertHeaderAndName(byteName, messageLength, message); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            bool flipEndian = BitConverter.IsLittleEndian; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            message[offset] = GetSetValue; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset++; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            message[offset] = Convert.ToByte(byteValue.Length); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset++; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            Buffer.BlockCopy(byteValue, 0, message, offset, byteValue.Length); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset += byteValue.Length; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            if (lockkey.HasValue) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            { 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                message[offset] = GetSetLockkey; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                offset++; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                message[offset] = (byte)4; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                offset++; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                var lockKeyBytes = BitConverter.GetBytes(lockkey.Value); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                if (flipEndian) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                    Array.Reverse(lockKeyBytes); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                Buffer.BlockCopy(lockKeyBytes, 0, message, offset, 4); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                offset += 4; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            } 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            // calculate crc and insert at the end of the message 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var crcBytes = BitConverter.GetBytes(HdHomerunCrc.GetCrc32(message, messageLength - 4)); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            if (flipEndian) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                Array.Reverse(crcBytes); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            Buffer.BlockCopy(crcBytes, 0, message, offset, 4); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            return message; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+        } 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+        private static int InsertHeaderAndName(byte[] byteName, int messageLength, byte[] message) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+        { 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            // check to see if we need to flip endiannes 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            bool flipEndian = BitConverter.IsLittleEndian; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            int offset = 0; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            // create header bytes 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var getSetBytes = BitConverter.GetBytes(GetSetRequest); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var msgLenBytes = BitConverter.GetBytes((ushort)(messageLength - 8)); // Subtrace 4 bytes for header and 4 bytes for crc 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            if (flipEndian) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            { 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                Array.Reverse(getSetBytes); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                Array.Reverse(msgLenBytes); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            } 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            // insert header bytes into message 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            Buffer.BlockCopy(getSetBytes, 0, message, offset, 2); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset += 2; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            Buffer.BlockCopy(msgLenBytes, 0, message, offset, 2); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset += 2; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            // insert tag name and length 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            message[offset] = GetSetName; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset++; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            message[offset] = Convert.ToByte(byteName.Length); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset++; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            // insert name string 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            Buffer.BlockCopy(byteName, 0, message, offset, byteName.Length); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset += byteName.Length; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            return offset; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+        } 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+        private static bool ParseReturnMessage(byte[] buf, int numBytes, out string returnVal) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+        { 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            returnVal = String.Empty; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            if (numBytes < 4) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                return false; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var flipEndian = BitConverter.IsLittleEndian; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            int offset = 0; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            byte[] msgTypeBytes = new byte[2]; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            Buffer.BlockCopy(buf, offset, msgTypeBytes, 0, msgTypeBytes.Length); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            if (flipEndian) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                Array.Reverse(msgTypeBytes); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var msgType = BitConverter.ToUInt16(msgTypeBytes, 0); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset += 2; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            if (msgType != GetSetReply) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                return false; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            byte[] msgLengthBytes = new byte[2]; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            Buffer.BlockCopy(buf, offset, msgLengthBytes, 0, msgLengthBytes.Length); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            if (flipEndian) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                Array.Reverse(msgLengthBytes); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var msgLength = BitConverter.ToUInt16(msgLengthBytes, 0); 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset += 2; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            if (numBytes < msgLength + 8) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                return false; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var nameTag = buf[offset]; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset++; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var nameLength = buf[offset]; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset++; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            // skip the name field to get to value for return 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset += nameLength; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var valueTag = buf[offset]; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset++; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            var valueLength = buf[offset]; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            offset++; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            returnVal = Encoding.UTF8.GetString(buf, offset, valueLength - 1); // remove null terminator 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            return true; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+        } 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+        private class HdHomerunCrc 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+        { 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            private static UInt32[] crc_table = { 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d }; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            public static UInt32 GetCrc32(byte[] bytes, int numBytes) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            { 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                var hash = 0xffffffff; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                for (var i = 0; i < numBytes; i++) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                    hash = (hash >> 8) ^ crc_table[(hash ^ bytes[i]) & 0xff]; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                var tmp = ~hash & 0xffffffff; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                var b0 = tmp & 0xff; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                var b1 = (tmp >> 8) & 0xff; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                var b2 = (tmp >> 16) & 0xff; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                var b3 = (tmp >> 24) & 0xff; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                hash = (b0 << 24) | (b1 << 16) | (b2 << 8) | b3; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+                return hash; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+            } 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+        } 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+    } 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+} 
			 |