public static uint CalculateCRCForChunk(string chunkType, byte[] chunkData)
{
byte[] chunkTypeBytes = Encoding.UTF8.GetBytes(chunkType);
Ionic.Crc.CRC32 crc32calculator = new Ionic.Crc.CRC32();
crc32calculator.SlurpBlock(chunkTypeBytes, 0, chunkTypeBytes.Length);
crc32calculator.SlurpBlock(chunkData, 0, chunkData.Length);
return((uint)crc32calculator.Crc32Result);
}
public override void Write(System.Byte[] buffer, int offset, int count)
{
#if !NETFX_CORE
// workitem 7159
// calculate the CRC on the unccompressed data (before writing)
if (crc != null)
{
crc.SlurpBlock(buffer, offset, count);
}
#endif
if (_streamMode == StreamMode.Undefined)
{
_streamMode = StreamMode.Writer;
}
else if (_streamMode != StreamMode.Writer)
{
throw new ZlibException("Cannot Write after Reading.");
}
if (count == 0)
{
return;
}
// first reference of z property will initialize the private var _z
z.InputBuffer = buffer;
_z.NextIn = offset;
_z.AvailableBytesIn = count;
bool done = false;
do
{
_z.OutputBuffer = workingBuffer;
_z.NextOut = 0;
_z.AvailableBytesOut = _workingBuffer.Length;
int rc = (_wantCompress)
? _z.Deflate(_flushMode)
: _z.Inflate(_flushMode);
if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END)
{
throw new ZlibException((_wantCompress ? "de" : "in") + "flating: " + _z.Message);
}
//if (_workingBuffer.Length - _z.AvailableBytesOut > 0)
_stream.Write(_workingBuffer, 0, _workingBuffer.Length - _z.AvailableBytesOut);
done = _z.AvailableBytesIn == 0 && _z.AvailableBytesOut != 0;
// If GZIP and de-compress, we're done when 8 bytes remain.
if (_flavor == ZlibStreamFlavor.GZIP && !_wantCompress)
{
done = (_z.AvailableBytesIn == 8 && _z.AvailableBytesOut != 0);
}
}while (!done);
}
public async Task <TcpMessage> Receive(CancellationToken token = default(CancellationToken))
{
var packetLengthBytes = new byte[4];
if (await _stream.ReadAsync(packetLengthBytes, 0, 4, token).ConfigureAwait(false) != 4)
{
throw new InvalidOperationException("Couldn't read the packet length");
}
int packetLength = BitConverter.ToInt32(packetLengthBytes, 0);
var seqBytes = new byte[4];
if (await _stream.ReadAsync(seqBytes, 0, 4, token).ConfigureAwait(false) != 4)
{
throw new InvalidOperationException("Couldn't read the sequence");
}
int seq = BitConverter.ToInt32(seqBytes, 0);
int readBytes = 0;
var body = new byte[packetLength - 12];
int neededToRead = packetLength - 12;
do
{
var bodyByte = new byte[packetLength - 12];
var availableBytes = await _stream.ReadAsync(bodyByte, 0, neededToRead, token).ConfigureAwait(false);
neededToRead -= availableBytes;
Buffer.BlockCopy(bodyByte, 0, body, readBytes, availableBytes);
readBytes += availableBytes;
}while (readBytes != packetLength - 12);
var crcBytes = new byte[4];
if (await _stream.ReadAsync(crcBytes, 0, 4, token).ConfigureAwait(false) != 4)
{
throw new InvalidOperationException("Couldn't read the crc");
}
int checksum = BitConverter.ToInt32(crcBytes, 0);
byte[] rv = new byte[packetLengthBytes.Length + seqBytes.Length + body.Length];
Buffer.BlockCopy(packetLengthBytes, 0, rv, 0, packetLengthBytes.Length);
Buffer.BlockCopy(seqBytes, 0, rv, packetLengthBytes.Length, seqBytes.Length);
Buffer.BlockCopy(body, 0, rv, packetLengthBytes.Length + seqBytes.Length, body.Length);
var crc32 = new Ionic.Crc.CRC32();
crc32.SlurpBlock(rv, 0, rv.Length);
var validChecksum = crc32.Crc32Result;
if (checksum != validChecksum)
{
throw new InvalidOperationException("invalid checksum! skip");
}
return(new TcpMessage(seq, body));
}
public TcpMessage Receieve()
{
lock (_locker)
{
var stream = _tcpClient.GetStream();
var packetLengthBytes = new byte[4];
if (stream.Read(packetLengthBytes, 0, 4) != 4)
{
throw new InvalidOperationException("Couldn't read the packet length");
}
int packetLength = BitConverter.ToInt32(packetLengthBytes, 0);
var seqBytes = new byte[4];
if (stream.Read(seqBytes, 0, 4) != 4)
{
throw new InvalidOperationException("Couldn't read the sequence");
}
int seq = BitConverter.ToInt32(seqBytes, 0);
int readBytes = 0;
var body = new byte[packetLength - 12];
int neededToRead = packetLength - 12;
do
{
var bodyByte = new byte[packetLength - 12];
var availableBytes = stream.Read(bodyByte, 0, neededToRead);
neededToRead -= availableBytes;
Buffer.BlockCopy(bodyByte, 0, body, readBytes, availableBytes);
readBytes += availableBytes;
}while (readBytes != packetLength - 12);
var crcBytes = new byte[4];
if (stream.Read(crcBytes, 0, 4) != 4)
{
throw new InvalidOperationException("Couldn't read the crc");
}
int checksum = BitConverter.ToInt32(crcBytes, 0);
byte[] rv = new byte[packetLengthBytes.Length + seqBytes.Length + body.Length];
Buffer.BlockCopy(packetLengthBytes, 0, rv, 0, packetLengthBytes.Length);
Buffer.BlockCopy(seqBytes, 0, rv, packetLengthBytes.Length, seqBytes.Length);
Buffer.BlockCopy(body, 0, rv, packetLengthBytes.Length + seqBytes.Length, body.Length);
var crc32 = new Ionic.Crc.CRC32();
crc32.SlurpBlock(rv, 0, rv.Length);
var validChecksum = crc32.Crc32Result;
if (checksum != validChecksum)
{
throw new InvalidOperationException("invalid checksum! skip");
}
return(new TcpMessage(seq, body));
}
}
private static bool IsValidChecksum(byte[] block, int checksum)
{
var crc32 = new Ionic.Crc.CRC32();
crc32.SlurpBlock(block, 0, block.Length);
var validChecksum = crc32.Crc32Result;
return(checksum == validChecksum);
}
public async Task <TcpMessage> Receieve()
{
// packet length
var packetLengthBytes = new byte[4];
if (!await ReadBuffer(stream, packetLengthBytes))
{
return(null);
}
int packetLength = BitConverter.ToInt32(packetLengthBytes, 0);
// seq
var seqBytes = new byte[4];
if (!await ReadBuffer(stream, seqBytes))
{
return(null);
}
int seq = BitConverter.ToInt32(seqBytes, 0);
// body
var bodyBytes = new byte[packetLength - 12];
if (!await ReadBuffer(stream, bodyBytes))
{
return(null);
}
// crc
var crcBytes = new byte[4];
if (!await ReadBuffer(stream, crcBytes))
{
return(null);
}
int checksum = BitConverter.ToInt32(crcBytes, 0);
byte[] rv = new byte[packetLengthBytes.Length + seqBytes.Length + bodyBytes.Length];
Buffer.BlockCopy(packetLengthBytes, 0, rv, 0, packetLengthBytes.Length);
Buffer.BlockCopy(seqBytes, 0, rv, packetLengthBytes.Length, seqBytes.Length);
Buffer.BlockCopy(bodyBytes, 0, rv, packetLengthBytes.Length + seqBytes.Length, bodyBytes.Length);
var crc32 = new Ionic.Crc.CRC32();
crc32.SlurpBlock(rv, 0, rv.Length);
var validChecksum = crc32.Crc32Result;
if (checksum != validChecksum)
{
throw new InvalidOperationException("invalid checksum! skip");
}
return(new TcpMessage(seq, bodyBytes));
}
private void _DeflateOne(Object wi)
{
// compress one buffer
WorkItem workitem = (WorkItem)wi;
try
{
int myItem = workitem.index;
Ionic.Crc.CRC32 crc = new Ionic.Crc.CRC32();
// calc CRC on the buffer
crc.SlurpBlock(workitem.buffer, 0, workitem.inputBytesAvailable);
// deflate it
DeflateOneSegment(workitem);
// update status
workitem.crc = crc.Crc32Result;
TraceOutput(TraceBits.Compress,
"Compress wi({0}) ord({1}) len({2})",
workitem.index,
workitem.ordinal,
workitem.compressedBytesAvailable
);
lock (_latestLock)
{
if (workitem.ordinal > _latestCompressed)
{
_latestCompressed = workitem.ordinal;
}
}
lock (_toWrite)
{
_toWrite.Enqueue(workitem.index);
}
_newlyCompressedBlob.Set();
}
catch (System.Exception exc1)
{
lock (_eLock)
{
// expose the exception to the main thread
if (_pendingException != null)
{
_pendingException = exc1;
}
}
}
}
public async Task<TcpMessage> Receieve()
{
var stream = _tcpClient.GetStream();
var packetLengthBytes = new byte[4];
if (await stream.ReadAsync(packetLengthBytes, 0, 4) != 4)
throw new InvalidOperationException("Couldn't read the packet length");
int packetLength = BitConverter.ToInt32(packetLengthBytes, 0);
var seqBytes = new byte[4];
if (await stream.ReadAsync(seqBytes, 0, 4) != 4)
throw new InvalidOperationException("Couldn't read the sequence");
int seq = BitConverter.ToInt32(seqBytes, 0);
int readBytes = 0;
var body = new byte[packetLength - 12];
int neededToRead = packetLength - 12;
do
{
var bodyByte = new byte[packetLength - 12];
var availableBytes = await stream.ReadAsync(bodyByte, 0, neededToRead);
neededToRead -= availableBytes;
Buffer.BlockCopy(bodyByte, 0, body, readBytes, availableBytes);
readBytes += availableBytes;
}
while (readBytes != packetLength - 12);
var crcBytes = new byte[4];
if (await stream.ReadAsync(crcBytes, 0, 4) != 4)
throw new InvalidOperationException("Couldn't read the crc");
int checksum = BitConverter.ToInt32(crcBytes, 0);
byte[] rv = new byte[packetLengthBytes.Length + seqBytes.Length + body.Length];
Buffer.BlockCopy(packetLengthBytes, 0, rv, 0, packetLengthBytes.Length);
Buffer.BlockCopy(seqBytes, 0, rv, packetLengthBytes.Length, seqBytes.Length);
Buffer.BlockCopy(body, 0, rv, packetLengthBytes.Length + seqBytes.Length, body.Length);
var crc32 = new Ionic.Crc.CRC32();
crc32.SlurpBlock(rv, 0, rv.Length);
var validChecksum = crc32.Crc32Result;
if (checksum != validChecksum)
{
throw new InvalidOperationException("invalid checksum! skip");
}
return new TcpMessage(seq, body);
}
private void _DeflateOne(Object wi)
{
// compress one buffer
WorkItem workitem = (WorkItem) wi;
try
{
int myItem = workitem.index;
Ionic.Crc.CRC32 crc = new Ionic.Crc.CRC32();
// calc CRC on the buffer
crc.SlurpBlock(workitem.buffer, 0, workitem.inputBytesAvailable);
// deflate it
DeflateOneSegment(workitem);
// update status
workitem.crc = crc.Crc32Result;
TraceOutput(TraceBits.Compress,
"Compress wi({0}) ord({1}) len({2})",
workitem.index,
workitem.ordinal,
workitem.compressedBytesAvailable
);
lock(_latestLock)
{
if (workitem.ordinal > _latestCompressed)
_latestCompressed = workitem.ordinal;
}
lock (_toWrite)
{
_toWrite.Enqueue(workitem.index);
}
_newlyCompressedBlob.Set();
}
catch (System.Exception exc1)
{
lock(_eLock)
{
// expose the exception to the main thread
if (_pendingException!=null)
_pendingException = exc1;
}
}
}
public async Task <TcpMessage> Receieve()
{
logger.Trace($"Wait for answer {_tcpClient.Available} ...");
var stream = _tcpClient.GetStream();
var packetLengthBytes = new byte[4];
if (await stream.ReadAsync(packetLengthBytes, 0, 4) != 4)
{
throw new InvalidOperationException("Couldn't read the packet length");
}
int packetLength = BitConverter.ToInt32(packetLengthBytes, 0);
logger.Debug("[IN] Packet length: {0}", packetLength);
var seqBytes = new byte[4];
if (await stream.ReadAsync(seqBytes, 0, 4) != 4)
{
throw new InvalidOperationException("Couldn't read the sequence");
}
int seq = BitConverter.ToInt32(seqBytes, 0);
logger.Debug("[IN] Sequence: {0}", seq);
int readBytes = 0;
var body = new byte[packetLength - 12];
int neededToRead = packetLength - 12;
do
{
var bodyByte = new byte[packetLength - 12];
var availableBytes = await stream.ReadAsync(bodyByte, 0, neededToRead);
neededToRead -= availableBytes;
Buffer.BlockCopy(bodyByte, 0, body, readBytes, availableBytes);
readBytes += availableBytes;
}while (readBytes != packetLength - 12);
var crcBytes = new byte[4];
if (await stream.ReadAsync(crcBytes, 0, 4) != 4)
{
throw new InvalidOperationException("Couldn't read the crc");
}
int checksum = BitConverter.ToInt32(crcBytes, 0);
byte[] rv = new byte[packetLengthBytes.Length + seqBytes.Length + body.Length];
Buffer.BlockCopy(packetLengthBytes, 0, rv, 0, packetLengthBytes.Length);
Buffer.BlockCopy(seqBytes, 0, rv, packetLengthBytes.Length, seqBytes.Length);
Buffer.BlockCopy(body, 0, rv, packetLengthBytes.Length + seqBytes.Length, body.Length);
var crc32 = new Ionic.Crc.CRC32();
crc32.SlurpBlock(rv, 0, rv.Length);
var validChecksum = crc32.Crc32Result;
if (checksum != validChecksum)
{
throw new InvalidOperationException("invalid checksum! skip");
}
return(new TcpMessage(seq, body));
}
public async Task <TcpMessage> Receieve(int timeoutms)
{
logger.Trace($"Wait for event {_tcpClient.Available} ...");
var stream = _tcpClient.GetStream();
var packetLengthBytes = new byte[4];
var token = tokenSource.Token;
stream.ReadTimeout = timeoutms;
int bytes = 0;
try
{
bytes = stream.Read(packetLengthBytes, 0, 4);
} catch (System.IO.IOException io)
{
var socketError = io.InnerException as SocketException;
if (socketError != null && socketError.SocketErrorCode == SocketError.TimedOut)
{
throw new OperationCanceledException();
}
throw io;
}
if (bytes != 4)
{
throw new InvalidOperationException("Couldn't read the packet length");
}
int packetLength = BitConverter.ToInt32(packetLengthBytes, 0);
logger.Debug("[IN]* Packet length: {0}", packetLength);
var seqBytes = new byte[4];
if (await stream.ReadAsync(seqBytes, 0, 4) != 4)
{
throw new InvalidOperationException("Couldn't read the sequence");
}
int seq = BitConverter.ToInt32(seqBytes, 0);
logger.Debug("[IN]* sequence: {0}", seq);
int readBytes = 0;
var body = new byte[packetLength - 12];
int neededToRead = packetLength - 12;
do
{
var bodyByte = new byte[packetLength - 12];
var availableBytes = await stream.ReadAsync(bodyByte, 0, neededToRead);
neededToRead -= availableBytes;
Buffer.BlockCopy(bodyByte, 0, body, readBytes, availableBytes);
readBytes += availableBytes;
}while (readBytes != packetLength - 12);
var crcBytes = new byte[4];
if (await stream.ReadAsync(crcBytes, 0, 4) != 4)
{
throw new InvalidOperationException("Couldn't read the crc");
}
int checksum = BitConverter.ToInt32(crcBytes, 0);
byte[] rv = new byte[packetLengthBytes.Length + seqBytes.Length + body.Length];
Buffer.BlockCopy(packetLengthBytes, 0, rv, 0, packetLengthBytes.Length);
Buffer.BlockCopy(seqBytes, 0, rv, packetLengthBytes.Length, seqBytes.Length);
Buffer.BlockCopy(body, 0, rv, packetLengthBytes.Length + seqBytes.Length, body.Length);
var crc32 = new Ionic.Crc.CRC32();
crc32.SlurpBlock(rv, 0, rv.Length);
var validChecksum = crc32.Crc32Result;
if (checksum != validChecksum)
{
throw new InvalidOperationException("invalid checksum! skip");
}
return(new TcpMessage(seq, body));
}
public static void SetModded()
{
try {
if (global::Rust.Global.SteamServer == null)
return;
using (TimeWarning.New("UpdateServerInformation", 0.1f)) {
var steamServer = global::Rust.Global.SteamServer;
System.Reflection.Assembly assembly = typeof(ServerMgr).Assembly;
byte[] byteArray = System.IO.File.ReadAllBytes(assembly.Location);
Ionic.Crc.CRC32 cRC = new Ionic.Crc.CRC32();
cRC.SlurpBlock(byteArray, 0, byteArray.Length);
string _AssemblyHash = cRC.Crc32Result.ToString("x");
steamServer.ServerName = ConVar.Server.hostname;
steamServer.MaxPlayers = ConVar.Server.maxplayers;
steamServer.Passworded = false;
steamServer.MapName = UnityEngine.SceneManagement.SceneManager.GetActiveScene().name;
string gameTags = string.Format("mp{0},cp{1},qp{5},v{2}{3},h{4}", new object[] {
ConVar.Server.maxplayers,
BasePlayer.activePlayerList.Count,
global::Rust.Protocol.network,
ConVar.Server.pve ? ",pve" : string.Empty,
pluton.enabled ? ",modded,pluton" : string.Empty,
_AssemblyHash,
ServerMgr.Instance.connectionQueue.Queued
});
steamServer.GameTags = gameTags;
string[] array = ConVar.Server.description.SplitToChunks(100).ToArray();
for (int i = 0; i < 16; i++) {
if (i < array.Length) {
steamServer.SetKey(string.Format("description_{0:00}", i), array[i]);
} else {
steamServer.SetKey(string.Format("description_{0:00}", i), string.Empty);
}
}
steamServer.SetKey("hash", _AssemblyHash);
steamServer.SetKey("world.seed", global::World.Seed.ToString());
steamServer.SetKey("world.size", global::World.Size.ToString());
steamServer.SetKey("pve", ConVar.Server.pve.ToString());
steamServer.SetKey("headerimage", ConVar.Server.headerimage);
steamServer.SetKey("url", ConVar.Server.url);
steamServer.SetKey("uptime", ((int)Time.realtimeSinceStartup).ToString());
steamServer.SetKey("mem_ws", Performance.report.usedMemoryWorkingSetMB.ToString());
steamServer.SetKey("mem_pv", Performance.report.usedMemoryPrivateMB.ToString());
steamServer.SetKey("gc_mb", Performance.report.memoryAllocations.ToString());
steamServer.SetKey("gc_cl", Performance.report.memoryCollections.ToString());
steamServer.SetKey("fps", Performance.report.frameRate.ToString());
steamServer.SetKey("fps_avg", Performance.report.frameRateAverage.ToString("0.00"));
steamServer.SetKey("ent_cnt", BaseNetworkable.serverEntities.Count.ToString());
steamServer.SetKey("build", BuildInformation.VersionStampDays.ToString());
}
} catch (Exception ex) {
Logger.LogError("[Hooks] Error while setting the server modded.");
Logger.LogException(ex);
}
}
public override System.Int32 Read(System.Byte[] buffer, System.Int32 offset, System.Int32 count)
{
// According to MS documentation, any implementation of the IO.Stream.Read function must:
// (a) throw an exception if offset & count reference an invalid part of the buffer,
// or if count < 0, or if buffer is null
// (b) return 0 only upon EOF, or if count = 0
// (c) if not EOF, then return at least 1 byte, up to <count> bytes
if (_streamMode == StreamMode.Undefined)
{
if (!this._stream.CanRead)
{
throw new ZlibException("The stream is not readable.");
}
// for the first read, set up some controls.
_streamMode = StreamMode.Reader;
// (The first reference to _z goes through the private accessor which
// may initialize it.)
z.AvailableBytesIn = 0;
if (_flavor == ZlibStreamFlavor.GZIP)
{
_gzipHeaderByteCount = _ReadAndValidateGzipHeader();
// workitem 8501: handle edge case (decompress empty stream)
if (_gzipHeaderByteCount == 0)
{
return(0);
}
}
}
if (_streamMode != StreamMode.Reader)
{
throw new ZlibException("Cannot Read after Writing.");
}
if (count == 0)
{
return(0);
}
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (count < 0)
{
throw new ArgumentOutOfRangeException("count");
}
if (offset < buffer.GetLowerBound(0))
{
throw new ArgumentOutOfRangeException("offset");
}
if ((offset + count) > buffer.GetLength(0))
{
throw new ArgumentOutOfRangeException("count");
}
int rc = 0;
// set up the output of the deflate/inflate codec:
_z.OutputBuffer = buffer;
_z.NextOut = offset;
_z.AvailableBytesOut = count;
// This is necessary in case _workingBuffer has been resized. (new byte[])
// (The first reference to _workingBuffer goes through the private accessor which
// may initialize it.)
_z.InputBuffer = workingBuffer;
do
{
// need data in _workingBuffer in order to deflate/inflate. Here, we check if we have any.
if ((_z.AvailableBytesIn == 0) && (!nomoreinput))
{
// No data available, so try to Read data from the captive stream.
_z.NextIn = 0;
_z.AvailableBytesIn = _stream.Read(_workingBuffer, 0, _workingBuffer.Length);
if (_z.AvailableBytesIn == 0)
{
nomoreinput = true;
}
}
// we have data in InputBuffer; now compress or decompress as appropriate
rc = _z.Inflate(_flushMode);
if (nomoreinput && (rc == ZlibConstants.Z_BUF_ERROR))
{
return(0);
}
if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END)
{
throw new ZlibException(String.Format(CultureInfo.InvariantCulture, "inflating: rc={0} msg={1}", rc, _z.Message));
}
if ((nomoreinput || rc == ZlibConstants.Z_STREAM_END) && (_z.AvailableBytesOut == count))
{
break; // nothing more to read
}
}
//while (_z.AvailableBytesOut == count && rc == ZlibConstants.Z_OK);
while (_z.AvailableBytesOut > 0 && !nomoreinput && rc == ZlibConstants.Z_OK);
// workitem 8557
// is there more room in output?
if (_z.AvailableBytesOut > 0)
{
if (rc == ZlibConstants.Z_OK && _z.AvailableBytesIn == 0)
{
// deferred
}
}
rc = (count - _z.AvailableBytesOut);
// calculate CRC after reading
if (crc != null)
{
crc.SlurpBlock(buffer, offset, rc);
}
return(rc);
}
public async Task <TcpMessage> Receieve()
{
//var stream = _tcpClient.GetStream();
//var packetLengthBytes = new byte[4];
//if (await stream.ReadAsync(packetLengthBytes, 0, 4) != 4)
// throw new InvalidOperationException("Couldn't read the packet length");
//int packetLength = BitConverter.ToInt32(packetLengthBytes, 0);
//var seqBytes = new byte[4];
//if (await stream.ReadAsync(seqBytes, 0, 4) != 4)
// throw new InvalidOperationException("Couldn't read the sequence");
//int seq = BitConverter.ToInt32(seqBytes, 0);
//int readBytes = 0;
//var body = new byte[packetLength - 12];
//int neededToRead = packetLength - 12;
//do
//{
// var bodyByte = new byte[packetLength - 12];
// var availableBytes = await stream.ReadAsync(bodyByte, 0, neededToRead);
// neededToRead -= availableBytes;
// Buffer.BlockCopy(bodyByte, 0, body, readBytes, availableBytes);
// readBytes += availableBytes;
//}
//while (readBytes != packetLength - 12);
//var crcBytes = new byte[4];
//if (await stream.ReadAsync(crcBytes, 0, 4) != 4)
// throw new InvalidOperationException("Couldn't read the crc");
//int checksum = BitConverter.ToInt32(crcBytes, 0);
// packet length
var packetLengthBytes = new byte[4];
if (!await ReadBuffer(_stream, packetLengthBytes))
{
return(null);
}
int packetLength = BitConverter.ToInt32(packetLengthBytes, 0);
// seq
var seqBytes = new byte[4];
if (!await ReadBuffer(_stream, seqBytes))
{
return(null);
}
int seq = BitConverter.ToInt32(seqBytes, 0);
// body
var bodyBytes = new byte[packetLength - 12];
if (!await ReadBuffer(_stream, bodyBytes))
{
return(null);
}
// crc
var crcBytes = new byte[4];
if (!await ReadBuffer(_stream, crcBytes))
{
return(null);
}
int checksum = BitConverter.ToInt32(crcBytes, 0);
byte[] rv = new byte[packetLengthBytes.Length + seqBytes.Length + bodyBytes.Length];
Buffer.BlockCopy(packetLengthBytes, 0, rv, 0, packetLengthBytes.Length);
Buffer.BlockCopy(seqBytes, 0, rv, packetLengthBytes.Length, seqBytes.Length);
Buffer.BlockCopy(bodyBytes, 0, rv, packetLengthBytes.Length + seqBytes.Length, bodyBytes.Length);
var crc32 = new Ionic.Crc.CRC32();
crc32.SlurpBlock(rv, 0, rv.Length);
var validChecksum = crc32.Crc32Result;
if (checksum != validChecksum)
{
throw new InvalidOperationException("invalid checksum! skip");
}
return(new TcpMessage(seq, bodyBytes));
}