DeflateStreamAsyncResult.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Sys / System / IO / compression / DeflateStreamAsyncResult.cs / 1305376 / DeflateStreamAsyncResult.cs
                        
                        
                            namespace System.IO.Compression { 
    using System.Threading;

    internal class DeflateStreamAsyncResult : IAsyncResult {
        public byte[] buffer; 
        public int offset;
        public int count; 
        // disable csharp compiler warning #0414: field assigned unused value 
#pragma warning disable 0414
        public bool isWrite; 
#pragma warning restore 0414

        private object m_AsyncObject;               // Caller's async object.
        private object m_AsyncState;                // Caller's state object. 
        private AsyncCallback m_AsyncCallback;      // Caller's callback method.
 
        private object m_Result;                     // Final IO result to be returned byt the End*() method. 
        internal bool m_CompletedSynchronously;      // true if the operation completed synchronously.
        private int m_InvokedCallback;               // 0 is callback is not called 
        private int m_Completed;                     // 0 if not completed >0 otherwise.
        private object m_Event;                      // lazy allocated event to be returned in the IAsyncResult for the client to wait on

        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;
        } 
 
        // Interface method to return the caller's state object.
        public object AsyncState { 
            get {
                return m_AsyncState;
            }
        } 

        // Interface property to return a WaitHandle that can be waited on for I/O completion. 
        // This property implements lazy event creation. 
        // the event object is only created when this property is accessed,
        // since we're internally only using callbacks, as long as the user is using 
        // callbacks as well we will not create an event at all.
        public WaitHandle AsyncWaitHandle {
            get {
                // save a copy of the completion status 
                int savedCompleted = m_Completed;
                if (m_Event == null) { 
                    // lazy allocation of the event: 
                    // if this property is never accessed this object is never created
                    Interlocked.CompareExchange(ref m_Event, new ManualResetEvent(savedCompleted != 0), null); 
                }

                ManualResetEvent castedEvent = (ManualResetEvent)m_Event;
                if (savedCompleted == 0 && m_Completed != 0) { 
                    // if, while the event was created in the reset state,
                    // the IO operation completed, set the event here. 
                    castedEvent.Set(); 
                }
                return castedEvent; 
            }
        }

        // Interface property, returning synchronous completion status. 
        public bool CompletedSynchronously {
            get { 
                return m_CompletedSynchronously; 
            }
        } 

        // Interface property, returning completion status.
        public bool IsCompleted {
            get { 
                return m_Completed != 0;
            } 
        } 

        // Internal property for setting the IO result. 
        internal object Result {
            get {
                return m_Result;
            } 
        }
 
        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); 
        }

        // Internal method for setting completion.
        // As a side effect, we'll signal the WaitHandle event and clean up. 
        private void Complete(bool completedSynchronously, object result) {
            m_CompletedSynchronously = completedSynchronously; 
            Complete(result); 
        }
 
        private void Complete(object result) {
            m_Result = result;

            // Set IsCompleted and the event only after the usercallback method. 
            Interlocked.Increment(ref m_Completed);
 
            if (m_Event != null) { 
                ((ManualResetEvent)m_Event).Set();
            } 

            if (Interlocked.Increment(ref m_InvokedCallback) == 1) {
                if (m_AsyncCallback != null) {
                    m_AsyncCallback(this); 
                }
            } 
        } 

    } 

}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DeflateStreamAsyncResult.cs source code in C# .NET

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