internal static FileStreamAsyncResult CreateBufferedReadResult(int numBufferedBytes, AsyncCallback userCallback, Object userStateObject, bool isWrite)
{
FileStreamAsyncResult asyncResult = new FileStreamAsyncResult(numBufferedBytes, userCallback, userStateObject, isWrite);
asyncResult.CallUserCallback();
return(asyncResult);
}
public override IAsyncResult BeginWrite(byte[] array, int offset, int numBytes, AsyncCallback userCallback, object stateObject)
{
if (array == null)
{
throw new ArgumentNullException("array");
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException("offset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (numBytes < 0)
{
throw new ArgumentOutOfRangeException("numBytes", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if ((array.Length - offset) < numBytes)
{
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen"));
}
if (this._handle.IsClosed)
{
__Error.FileNotOpen();
}
if (!this._isAsync)
{
return base.BeginWrite(array, offset, numBytes, userCallback, stateObject);
}
if (!this.CanWrite)
{
__Error.WriteNotSupported();
}
if (this._isPipe)
{
if (this._writePos > 0)
{
this.FlushWrite(false);
}
return this.BeginWriteCore(array, offset, numBytes, userCallback, stateObject);
}
if (this._writePos == 0)
{
if (this._readPos < this._readLen)
{
this.FlushRead();
}
this._readPos = 0;
this._readLen = 0;
}
int num = this._bufferSize - this._writePos;
if (numBytes <= num)
{
if (this._writePos == 0)
{
this._buffer = new byte[this._bufferSize];
}
Buffer.InternalBlockCopy(array, offset, this._buffer, this._writePos, numBytes);
this._writePos += numBytes;
FileStreamAsyncResult result = new FileStreamAsyncResult {
_userCallback = userCallback,
_userStateObject = stateObject,
_waitHandle = null,
_isWrite = true,
_numBufferedBytes = numBytes
};
result.CallUserCallback();
return result;
}
if (this._writePos > 0)
{
this.FlushWrite(false);
}
return this.BeginWriteCore(array, offset, numBytes, userCallback, stateObject);
}
private unsafe FileStreamAsyncResult BeginWriteCore(byte[] bytes, int offset, int numBytes, AsyncCallback userCallback, object stateObject)
{
NativeOverlapped* overlappedPtr;
FileStreamAsyncResult ar = new FileStreamAsyncResult {
_handle = this._handle,
_userCallback = userCallback,
_userStateObject = stateObject,
_isWrite = true
};
ManualResetEvent event2 = new ManualResetEvent(false);
ar._waitHandle = event2;
Overlapped overlapped = new Overlapped(0, 0, IntPtr.Zero, ar);
if (userCallback != null)
{
overlappedPtr = overlapped.Pack(IOCallback, bytes);
}
else
{
overlappedPtr = overlapped.UnsafePack(null, bytes);
}
ar._overlapped = overlappedPtr;
if (this.CanSeek)
{
long length = this.Length;
if (this._exposedHandle)
{
this.VerifyOSHandlePosition();
}
if ((this._pos + numBytes) > length)
{
this.SetLengthCore(this._pos + numBytes);
}
overlappedPtr->OffsetLow = (int) this._pos;
overlappedPtr->OffsetHigh = (int) (this._pos >> 0x20);
this.SeekCore((long) numBytes, SeekOrigin.Current);
}
int hr = 0;
if ((this.WriteFileNative(this._handle, bytes, offset, numBytes, overlappedPtr, out hr) == -1) && (numBytes != -1))
{
if (hr == 0xe8)
{
ar.CallUserCallback();
return ar;
}
if (hr == 0x3e5)
{
return ar;
}
if (!this._handle.IsClosed && this.CanSeek)
{
this.SeekCore(0L, SeekOrigin.Current);
}
if (hr == 0x26)
{
__Error.EndOfFile();
return ar;
}
__Error.WinIOError(hr, string.Empty);
}
return ar;
}
internal static FileStreamAsyncResult CreateBufferedReadResult(int numBufferedBytes, AsyncCallback userCallback, Object userStateObject, bool isWrite)
{
FileStreamAsyncResult asyncResult = new FileStreamAsyncResult(numBufferedBytes, userCallback, userStateObject, isWrite);
asyncResult.CallUserCallback();
return asyncResult;
}