GZipStream.cs source code in C# .NET

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

    public class GZipStream : Stream { 
        private DeflateStream deflateStream; 

        public GZipStream(Stream stream, CompressionMode mode) : this( stream, mode, false) { 
        }

        public GZipStream(Stream stream, CompressionMode mode, bool leaveOpen) {
 
            deflateStream = new DeflateStream(stream, mode, leaveOpen);
 
            if (mode == CompressionMode.Compress) { 
                IFileFormatWriter writeCommand = new GZipFormatter();
                deflateStream.SetFileFormatWriter(writeCommand); 
            }
            else {
                IFileFormatReader readCommand = new GZipDecoder();
                deflateStream.SetFileFormatReader(readCommand); 
            }
        } 
 
        public override bool CanRead {
            get { 
                if( deflateStream == null) {
                    return false;
                }
 
                return deflateStream.CanRead;
            } 
        } 

        public override bool CanWrite { 
            get {
                if( deflateStream == null) {
                    return false;
                } 

                return deflateStream.CanWrite; 
            } 
        }
 
        public override bool CanSeek {
            get {
                if( deflateStream == null) {
                   return false; 
                }
 
                return deflateStream.CanSeek; 
            }
        } 

        public override long Length {
            get {
            throw new NotSupportedException(SR.GetString(SR.NotSupported)); 
            }
        } 
 
        public override long Position {
            get { 
                throw new NotSupportedException(SR.GetString(SR.NotSupported));
            }

            set { 
                throw new NotSupportedException(SR.GetString(SR.NotSupported));
            } 
        } 

        public override void Flush() { 
            if( deflateStream == null) {
                throw new ObjectDisposedException(null, SR.GetString(SR.ObjectDisposed_StreamClosed));
            }
            deflateStream.Flush(); 
            return;
        } 
 
        public override long Seek(long offset, SeekOrigin origin) {
            throw new NotSupportedException(SR.GetString(SR.NotSupported)); 
        }

        public override void SetLength(long value) {
            throw new NotSupportedException(SR.GetString(SR.NotSupported)); 
        }
 
        [HostProtection(ExternalThreading=true)] 
        public override IAsyncResult BeginRead(byte[] array, int offset, int count, AsyncCallback asyncCallback, object asyncState) {
            if( deflateStream == null) { 
                throw new InvalidOperationException(SR.GetString(SR.ObjectDisposed_StreamClosed));
            }
            return deflateStream.BeginRead(array, offset, count, asyncCallback, asyncState);
        } 

        public override int EndRead(IAsyncResult asyncResult) { 
            if( deflateStream == null) { 
                throw new InvalidOperationException(SR.GetString(SR.ObjectDisposed_StreamClosed));
            } 
            return deflateStream.EndRead(asyncResult);
        }

        [HostProtection(ExternalThreading=true)] 
        public override IAsyncResult BeginWrite(byte[] array, int offset, int count, AsyncCallback asyncCallback, object asyncState) {
            if( deflateStream == null) { 
                throw new InvalidOperationException(SR.GetString(SR.ObjectDisposed_StreamClosed)); 
            }
            return deflateStream.BeginWrite(array, offset, count, asyncCallback, asyncState); 
        }

        public override void EndWrite(IAsyncResult asyncResult) {
            if( deflateStream == null) { 
                throw new InvalidOperationException(SR.GetString(SR.ObjectDisposed_StreamClosed));
            } 
            deflateStream.EndWrite(asyncResult); 
        }
        public override int Read(byte[] array, int offset, int count) { 
            if( deflateStream == null) {
                throw new ObjectDisposedException(null, SR.GetString(SR.ObjectDisposed_StreamClosed));
            }
 
            return deflateStream.Read(array, offset, count);
        } 
 
        public override void Write(byte[] array, int offset, int count) {
            if( deflateStream == null) { 
                throw new ObjectDisposedException(null, SR.GetString(SR.ObjectDisposed_StreamClosed));
            }

            deflateStream.Write(array, offset, count); 
        }
 
        protected override void Dispose(bool disposing) { 
            try {
                if (disposing && deflateStream != null) { 
                    deflateStream.Close();
                }
                deflateStream = null;
            } 
            finally {
                base.Dispose(disposing); 
            } 
        }
 
        public Stream BaseStream {
            get {
                if( deflateStream != null) {
                    return deflateStream.BaseStream; 
                }
                else { 
                    return null; 
                }
            } 
        }
    }

} 

 

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

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