GZipStream.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Sys / System / IO / compression / GZipStream.cs / 1 / 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, true); 
        }
 
        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; 
                } 
            }
        } 
    }

}

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