using System;
using System.Threading;

namespace Invensys.Compression;

internal class DeflateStreamAsyncResult : IAsyncResult
{
	public byte[] buffer;

	public int offset;

	public int count;

	public bool isWrite;

	private object m_AsyncObject;

	private object m_AsyncState;

	private AsyncCallback m_AsyncCallback;

	private object m_Result;

	internal bool m_CompletedSynchronously;

	private int m_InvokedCallback;

	private int m_Completed;

	private object m_Event;

	public object AsyncState => m_AsyncState;

	public WaitHandle AsyncWaitHandle
	{
		get
		{
			int completed = m_Completed;
			if (m_Event == null)
			{
				Interlocked.CompareExchange(ref m_Event, new ManualResetEvent(completed != 0), null);
			}
			ManualResetEvent manualResetEvent = (ManualResetEvent)m_Event;
			if (completed == 0 && m_Completed != 0)
			{
				manualResetEvent.Set();
			}
			return manualResetEvent;
		}
	}

	public bool CompletedSynchronously => m_CompletedSynchronously;

	public bool IsCompleted => m_Completed != 0;

	internal object Result => m_Result;

	public DeflateStreamAsyncResult(object asyncObject, object asyncState, AsyncCallback asyncCallback, byte[] buffer, int offset, int count)
	{
		this.buffer = buffer;
		this.offset = offset;
		this.count = count;
		m_CompletedSynchronously = true;
		m_AsyncObject = asyncObject;
		m_AsyncState = asyncState;
		m_AsyncCallback = asyncCallback;
	}

	internal void Close()
	{
		if (m_Event != null)
		{
			((ManualResetEvent)m_Event).Close();
		}
	}

	internal void InvokeCallback(bool completedSynchronously, object result)
	{
		Complete(completedSynchronously, result);
	}

	internal void InvokeCallback(object result)
	{
		Complete(result);
	}

	private void Complete(bool completedSynchronously, object result)
	{
		m_CompletedSynchronously = completedSynchronously;
		Complete(result);
	}

	private void Complete(object result)
	{
		m_Result = result;
		Interlocked.Increment(ref m_Completed);
		if (m_Event != null)
		{
			((ManualResetEvent)m_Event).Set();
		}
		if (Interlocked.Increment(ref m_InvokedCallback) == 1 && m_AsyncCallback != null)
		{
			m_AsyncCallback(this);
		}
	}
}