// To be used by HttpSys
internal NativeRequestContext(SafeNativeOverlapped nativeOverlapped, MemoryPool <Byte> memoryPool, uint?bufferSize, ulong requestId)
{
_nativeOverlapped = nativeOverlapped;
// TODO:
// Apparently the HttpReceiveHttpRequest memory alignment requirements for non - ARM processors
// are different than for ARM processors. We have seen 4 - byte - aligned buffers allocated on
// virtual x64/x86 machines which were accepted by HttpReceiveHttpRequest without errors. In
// these cases the buffer alignment may cause reading values at invalid offset. Setting buffer
// alignment to 0 for now.
//
// _bufferAlignment = (int)(requestAddress.ToInt64() & 0x07);
_bufferAlignment = 0;
var newSize = (int)(bufferSize ?? DefaultBufferSize) + AlignmentPadding;
if (newSize <= memoryPool.MaxBufferSize)
{
_backingBuffer = memoryPool.Rent(newSize);
}
else
{
// No size limit
_backingBuffer = MemoryPool <byte> .Shared.Rent(newSize);
}
_backingBuffer.Memory.Span.Fill(0);// Zero the buffer
_memoryHandle = _backingBuffer.Memory.Pin();
_nativeRequest = (HttpApiTypes.HTTP_REQUEST *)((long)_memoryHandle.Pointer + _bufferAlignment);
RequestId = requestId;
}
// ReleasePins() should be called exactly once. It must be called before Dispose() is called, which means it must be called
// before an object (Request) which closes the RequestContext on demand is returned to the application.
internal void ReleasePins()
{
Debug.Assert(_nativeRequest != null || _backingBuffer == null, "RequestContextBase::ReleasePins()|ReleasePins() called twice.");
_originalBufferAddress = (IntPtr)_nativeRequest;
_nativeRequest = null;
_nativeOverlapped?.Dispose();
_nativeOverlapped = null;
}
// To be used by HttpSys
internal NativeRequestContext(SafeNativeOverlapped nativeOverlapped,
int bufferAlignment,
HttpApiTypes.HTTP_REQUEST *nativeRequest,
byte[] backingBuffer,
ulong requestId)
{
_nativeOverlapped = nativeOverlapped;
_bufferAlignment = bufferAlignment;
_nativeRequest = nativeRequest;
_backingBuffer = backingBuffer;
RequestId = requestId;
}
internal static unsafe extern uint CancelIoEx(SafeHandle handle, SafeNativeOverlapped overlapped);