internal bool GetFixedSize(ref int size)
{
if (size < 0)
{
return(false);
}
if (_data.Length == 0)
{
return(true);
}
// Sensible?
size = ProtocolInformation.Padded(size, Alignment);
if (_data.Length == 1)
{
int valueSize = GetSize(this[0]);
if (valueSize == -1)
{
return(false);
}
size += valueSize;
return(true);
}
if (IsStructlike)
{
foreach (Signature sig in GetParts())
{
if (!sig.GetFixedSize(ref size))
{
return(false);
}
}
return(true);
}
if (IsArray || IsDict)
{
return(false);
}
if (IsStruct)
{
foreach (Signature sig in GetFieldSignatures())
{
if (!sig.GetFixedSize(ref size))
{
return(false);
}
}
return(true);
}
// Any other cases?
throw new Exception();
}
public async Task <Message> ReceiveMessageAsync()
{
try
{
int bytesRead = await ReadCountAsync(_headerReadBuffer, 0, 16, _fileDescriptors).ConfigureAwait(false);
if (bytesRead == 0)
{
return(null);
}
if (bytesRead != 16)
{
throw new ProtocolException("Header read length mismatch: " + bytesRead + " of expected " + "16");
}
EndianFlag endianness = (EndianFlag)_headerReadBuffer[0];
MessageReader reader = new MessageReader(endianness, new ArraySegment <byte>(_headerReadBuffer));
//discard endian byte, message type and flags, which we don't care about here
reader.Seek(3);
byte version = reader.ReadByte();
if (version != ProtocolInformation.Version)
{
throw new NotSupportedException("Protocol version '" + version.ToString() + "' is not supported");
}
uint bodyLength = reader.ReadUInt32();
//discard _methodSerial
reader.ReadUInt32();
uint headerLength = reader.ReadUInt32();
int bodyLen = (int)bodyLength;
int toRead = (int)headerLength;
//we fixup to include the padding following the header
toRead = ProtocolInformation.Padded(toRead, 8);
long msgLength = toRead + bodyLen;
if (msgLength > ProtocolInformation.MaxMessageLength)
{
throw new ProtocolException("Message length " + msgLength + " exceeds maximum allowed " + ProtocolInformation.MaxMessageLength + " bytes");
}
byte[] header = new byte[16 + toRead];
Array.Copy(_headerReadBuffer, header, 16);
bytesRead = await ReadCountAsync(header, 16, toRead, _fileDescriptors).ConfigureAwait(false);
if (bytesRead != toRead)
{
throw new ProtocolException("Message header length mismatch: " + bytesRead + " of expected " + toRead);
}
var messageHeader = Header.FromBytes(new ArraySegment <byte>(header));
byte[] body = null;
//read the body
if (bodyLen != 0)
{
body = new byte[bodyLen];
bytesRead = await ReadCountAsync(body, 0, bodyLen, _fileDescriptors).ConfigureAwait(false);
if (bytesRead != bodyLen)
{
throw new ProtocolException("Message body length mismatch: " + bytesRead + " of expected " + bodyLen);
}
}
if (_fileDescriptors.Count < messageHeader.NumberOfFds)
{
throw new ProtocolException("File descriptor length mismatch: " + _fileDescriptors.Count + " of expected " + messageHeader.NumberOfFds);
}
Message msg = new Message(
messageHeader,
body,
messageHeader.NumberOfFds == 0 ? null :
_fileDescriptors.Count == messageHeader.NumberOfFds ? _fileDescriptors.ToArray() :
_fileDescriptors.Take((int)messageHeader.NumberOfFds).ToArray()
);
_fileDescriptors.RemoveRange(0, (int)messageHeader.NumberOfFds);
return(msg);
}
catch
{
foreach (var fd in _fileDescriptors)
{
CloseSafeHandle.close(fd.Handle);
}
throw;
}
}
Message ReadMessageReal()
{
byte[] header = null;
byte[] body = null;
UnixFDArray fdArray = Connection.UnixFDSupported ? new UnixFDArray() : null;
int read;
//16 bytes is the size of the fixed part of the header
if (readBuffer == null)
{
readBuffer = new byte[16];
}
byte[] hbuf = readBuffer;
read = Read(hbuf, 0, 16, fdArray);
if (read == 0)
{
return(null);
}
if (read != 16)
{
throw new Exception("Header read length mismatch: " + read + " of expected " + "16");
}
EndianFlag endianness = (EndianFlag)hbuf[0];
MessageReader reader = new MessageReader(endianness, hbuf);
//discard endian byte, message type and flags, which we don't care about here
reader.Seek(3);
byte version = reader.ReadByte();
if (version < ProtocolInformation.MinVersion || version > ProtocolInformation.MaxVersion)
{
throw new NotSupportedException("Protocol version '" + version.ToString() + "' is not supported");
}
if (ProtocolInformation.Verbose)
{
if (version != ProtocolInformation.Version)
{
Console.Error.WriteLine("Warning: Protocol version '" + version.ToString() + "' is not explicitly supported but may be compatible");
}
}
uint bodyLength = reader.ReadUInt32();
//discard serial
reader.ReadUInt32();
uint headerLength = reader.ReadUInt32();
int bodyLen = (int)bodyLength;
int toRead = (int)headerLength;
//we fixup to include the padding following the header
toRead = ProtocolInformation.Padded(toRead, 8);
long msgLength = toRead + bodyLen;
if (msgLength > ProtocolInformation.MaxMessageLength)
{
throw new Exception("Message length " + msgLength + " exceeds maximum allowed " + ProtocolInformation.MaxMessageLength + " bytes");
}
header = new byte[16 + toRead];
Array.Copy(hbuf, header, 16);
read = Read(header, 16, toRead, fdArray);
if (read != toRead)
{
throw new Exception("Message header length mismatch: " + read + " of expected " + toRead);
}
//read the body
if (bodyLen != 0)
{
body = new byte[bodyLen];
read = Read(body, 0, bodyLen, fdArray);
if (read != bodyLen)
{
throw new Exception("Message body length mismatch: " + read + " of expected " + bodyLen);
}
}
Message msg = Message.FromReceivedBytes(Connection, header, body, fdArray);
return(msg);
}