SpStreamWrapper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Speech / Src / Internal / SapiInterop / SpStreamWrapper.cs / 1 / SpStreamWrapper.cs
                        

                        
                            //------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
//
// Description: 
//		Maps an audio stream the SAPI ISpStreamFormat 
//
// History: 
//		7/10/2005	[....]		
//-----------------------------------------------------------------

using System; 
using System.IO;
using System.Runtime.InteropServices; 
using System.Runtime.InteropServices.ComTypes; 
using System.Speech.AudioFormat;
using System.Speech.Internal.SapiInterop; 
using System.Speech.Internal.Synthesis;

#pragma warning disable 1634, 1691 // Allows suppression of certain PreSharp messages.
 
using STATSTG = System.Runtime.InteropServices.ComTypes.STATSTG;
 
namespace System.Speech.Internal.SapiInterop 
{
    internal class SpStreamWrapper : IStream, IDisposable 
    {
        //*******************************************************************
        //
        // Constructors 
        //
        //******************************************************************* 
 
        #region Constructors
 
        internal SpStreamWrapper (Stream stream)
        {
            _stream = stream;
            _endOfStreamPosition = stream.Length; 
        }
 
        ///  
        ///
        ///  
        public void Dispose ()
        {
            _stream.Dispose ();
            GC.SuppressFinalize (this); 
        }
 
        #endregion 

        //******************************************************************** 
        //
        // Public Methods
        //
        //******************************************************************* 

        #region public Methods 
 
        #region ISpStreamFormat interface implementation
 
        public void Read (byte [] pv, int cb, IntPtr pcbRead)
        {
            if (_endOfStreamPosition >= 0 && _stream.Position + cb > _endOfStreamPosition)
            { 
                cb = (int) (_endOfStreamPosition - _stream.Position);
            } 
 
            int read = 0;
            try 
            {
                read = _stream.Read (pv, 0, cb);
            }
            catch (EndOfStreamException) 
            {
                read = 0; 
            } 

            if (pcbRead != IntPtr.Zero) 
            {
                Marshal.WriteIntPtr (pcbRead, new IntPtr (read));
            }
        } 

        public void Write (byte [] pv, int cb, IntPtr pcbWritten) 
        { 
            throw new NotSupportedException ();
        } 

        public void Seek (long offset, int seekOrigin, IntPtr plibNewPosition)
        {
            _stream.Seek (offset, (SeekOrigin) seekOrigin); 

            if (plibNewPosition != IntPtr.Zero) 
            { 
                Marshal.WriteIntPtr (plibNewPosition, new IntPtr (_stream.Position));
            } 
        }
        public void SetSize (long libNewSize)
        {
            throw new NotSupportedException (); 
        }
        public void CopyTo (IStream pstm, long cb, IntPtr pcbRead, IntPtr pcbWritten) 
        { 
            throw new NotSupportedException ();
        } 
        public void Commit (int grfCommitFlags)
        {
            _stream.Flush ();
        } 
        public void Revert ()
        { 
            throw new NotSupportedException (); 
        }
        public void LockRegion (long libOffset, long cb, int dwLockType) 
        {
            throw new NotSupportedException ();
        }
        public void UnlockRegion (long libOffset, long cb, int dwLockType) 
        {
            throw new NotSupportedException (); 
        } 
        public void Stat (out STATSTG pstatstg, int grfStatFlag)
        { 
            pstatstg = new STATSTG ();
            pstatstg.cbSize = _stream.Length;
        }
 
        public void Clone (out IStream ppstm)
        { 
            throw new NotSupportedException (); 
        }
 
        #endregion

        #endregion
 
        //********************************************************************
        // 
        // Private Fields 
        //
        //******************************************************************** 

        #region Private Fields

        private Stream _stream; 
        protected long _endOfStreamPosition = -1;
 
        #endregion 

    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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