internal static byte[] ReadBytesFromSocketBuffer(int count, SocketBuffer socketBuffer)
{
if (count > socketBuffer.UnreadBytes)
{
throw new Exception("Did not find enough data to read.");
}
var retBytes = new byte[count];
Buffer.BlockCopy(socketBuffer.Buffer, (int)socketBuffer.ReadIndex, retBytes, 0, count);
socketBuffer.BytesRead(count);
return(retBytes);
}
internal bool GetBusyBufferAt(int index, out SocketBuffer buffer)
{
buffer = null;
lock (_mutex)
{
if (index >= _busyBuffers.Count)
{
return(false);
}
buffer = _busyBuffers[index];
return(true);
}
}
public void OnBufferFree(SocketBuffer buffer)
{
lock (_mutex)
{
if (_busyBuffers.Count > 0)
{
if (_busyBuffers.Remove(buffer))
{
_freeBuffers.Enqueue(buffer);
Monitor.Pulse(_mutex);
}
}
}
}
internal bool FreeTopBusyBuffer()
{
lock (_mutex)
{
if (_busyBuffers.Count > 0)
{
SocketBuffer buffer = _busyBuffers[0];
buffer.Clear();
_busyBuffers.RemoveAt(0);
_freeBuffers.Enqueue(buffer);
Monitor.Pulse(_mutex);
return(true);
}
return(false);
}
}
internal bool GetFreeOrNewBuffer(out SocketBuffer socketBuffer)
{
socketBuffer = null;
lock (_mutex)
{
while (_busyBuffers.Count == _maxBuffers && !_isDisposed)
{
Monitor.Wait(_mutex);
}
if (_freeBuffers.Count == 0)
{
_freeBuffers.Enqueue(_bufferFactory.CreateSocketBuffer(this));
}
socketBuffer = _freeBuffers.Dequeue();
_busyBuffers.Add(socketBuffer);
return(true);
}
}
// TODO: Introduce the .Net 4.7.x's Span class here.
public override int Read(byte[] buffer, int offset, int count)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset < 0 /*|| _commandLength - _position < offset*/)
{
throw new ArgumentOutOfRangeException("offset");
}
if (count < 0 /*|| _commandLength - _position < count*/)
{
throw new ArgumentOutOfRangeException("count");
}
if (buffer.Length - offset < count)
{
throw new ArgumentException("Argument_InvalidOffLen");
}
if (_buffers.Count == 0)
{
throw new Exception("No Buffer");
}
int bytesRead = 0;
while (bytesRead < count && _currBufferIndex < _buffers.Count)
{
SocketBuffer currentBuffer = _buffers[_currBufferIndex];
bytesRead += SocketBufferUtil.ReadBytesFromSocketBuffer(buffer, offset + bytesRead, count - bytesRead, currentBuffer);
_position += bytesRead;
if (currentBuffer.UnreadBytes == 0)
{
_currBufferIndex++;
}
// }
}
return(bytesRead);
}
internal static int ReadBytesFromSocketBuffer(byte[] buffer, int offset, int count, SocketBuffer socketBuffer)
{
int byteToRead = (int)socketBuffer.UnreadBytes > count ? count : (int)socketBuffer.UnreadBytes;
Buffer.BlockCopy(socketBuffer.Buffer, (int)socketBuffer.ReadIndex, buffer, offset, byteToRead);
socketBuffer.BytesRead(byteToRead);
return(byteToRead);
}
public override long Seek(long offset, SeekOrigin origin)
{
switch (origin)
{
case SeekOrigin.Begin:
{
if (offset < 0 || _commandLength < offset)
{
throw new ArgumentOutOfRangeException("offset");
}
_position = offset;
_currBufferIndex = 0;
for (int i = 0; i < _buffers.Count; i++)
{
if (i == 0)
{
_buffers[i].BytesRead(_commandStart - (int)_buffers[i].ReadIndex);
}
else
{
_buffers[i].BytesRead(0 - _buffers[i].ReadIndex);
}
}
while (offset > 0)
{
SocketBuffer currentBuffer = _buffers[_currBufferIndex];
if (currentBuffer.UnreadBytes < offset)
{
offset -= currentBuffer.UnreadBytes;
currentBuffer.BytesRead(currentBuffer.UnreadBytes);
_currBufferIndex++;
}
else
{
currentBuffer.BytesRead(offset);
}
}
break;
}
case SeekOrigin.Current:
{
long tempPosition = unchecked (_position + offset);
if (tempPosition < 0 || tempPosition > _commandLength)
{
throw new IOException("IO.IO_SeekBeforeBegin");
}
_position = tempPosition;
if (offset < 0)
{
while (offset < 0)
{
SocketBuffer currentBuffer = _buffers[_currBufferIndex];
currentBuffer.BytesRead(0 - currentBuffer.ReadIndex);
if (currentBuffer.ReadIndex + offset < 0)
{
offset += currentBuffer.ReadIndex;
currentBuffer.BytesRead(0 - currentBuffer.ReadIndex);
_currBufferIndex--;
}
else
{
currentBuffer.BytesRead(offset);
}
}
}
else
{
while (offset > 0)
{
SocketBuffer currentBuffer = _buffers[_currBufferIndex];
if (currentBuffer.UnreadBytes < offset)
{
offset -= currentBuffer.UnreadBytes;
currentBuffer.BytesRead(currentBuffer.UnreadBytes);
_currBufferIndex++;
}
else
{
currentBuffer.BytesRead(offset);
}
}
}
break;
}
case SeekOrigin.End:
{
if (offset > 0 || _commandLength < -1 * offset)
{
throw new ArgumentOutOfRangeException("offset");
}
_currBufferIndex = _buffers.Count - 1;
_position = _commandLength + offset;
for (int i = _buffers.Count - 1; i >= 0; i--)
{
if (i == _buffers.Count - 1)
{
_buffers[i].BytesRead(_commandEnd - _buffers[i].ReadIndex);
}
else
{
_buffers[i].BytesRead(_buffers[i].UnreadBytes);
}
}
while (offset < 0)
{
SocketBuffer currentBuffer = _buffers[_currBufferIndex];
if (currentBuffer.ReadIndex + offset < 0)
{
offset += currentBuffer.ReadIndex;
currentBuffer.BytesRead(0 - currentBuffer.ReadIndex);
_currBufferIndex--;
}
else
{
currentBuffer.BytesRead(offset);
}
}
break;
}
default: throw new ArgumentException("Argument_InvalidSeekOrigin");
}
return(_position);
}