UnmanagedMemoryStreamWrapper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / IO / UnmanagedMemoryStreamWrapper.cs / 1 / UnmanagedMemoryStreamWrapper.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  UnmanagedMemoryStreamWrapper 
**
** Purpose: Create a Memorystream over an UnmanagedMemoryStream 
**
===========================================================*/

using System; 
using System.Runtime.InteropServices;
using System.Security.Permissions; 
 
namespace System.IO {
    // Needed for backwards compatibility with V1.x usages of the 
    // ResourceManager, where a MemoryStream is now returned as an
    // UnmanagedMemoryStream from ResourceReader.
    internal sealed class UnmanagedMemoryStreamWrapper : MemoryStream {
        private UnmanagedMemoryStream _unmanagedStream; 

        internal UnmanagedMemoryStreamWrapper(UnmanagedMemoryStream stream) { 
            _unmanagedStream = stream; 
        }
 
        public override bool CanRead {
            get { return _unmanagedStream.CanRead; }
        }
 
        public override bool CanSeek {
            get { return _unmanagedStream.CanSeek; } 
        } 

        public override bool CanWrite { 
            get { return _unmanagedStream.CanWrite; }
        }

        protected override void Dispose(bool disposing) 
        {
            try { 
                if (disposing) 
                    _unmanagedStream.Close();
            } 
            finally {
                base.Dispose(disposing);
            }
        } 

        public override void Flush() { 
            _unmanagedStream.Flush(); 
        }
 
        public override byte[] GetBuffer() {
            throw new UnauthorizedAccessException(Environment.GetResourceString("UnauthorizedAccess_MemStreamBuffer"));
        }
 
        public override int Capacity {
            get { 
                return (int) _unmanagedStream.Capacity; 
            }
            set { 
                throw new IOException(Environment.GetResourceString("IO.IO_FixedCapacity"));
            }
        }
 
        public override long Length {
            get { 
                return _unmanagedStream.Length; 
            }
        } 

        public override long Position {
            get {
                return _unmanagedStream.Position; 
            }
            set { 
                _unmanagedStream.Position = value; 
            }
        } 

        public override int Read([In, Out] byte[] buffer, int offset, int count) {
            return _unmanagedStream.Read(buffer, offset, count);
        } 

        public override int ReadByte() { 
            return _unmanagedStream.ReadByte(); 
        }
 

        public override long Seek(long offset, SeekOrigin loc) {
            return _unmanagedStream.Seek(offset, loc);
        } 

        public unsafe override byte[] ToArray() { 
            if (!_unmanagedStream._isOpen) __Error.StreamIsClosed(); 
            if (!_unmanagedStream.CanRead) __Error.ReadNotSupported();
 
            byte[] buffer = new byte[_unmanagedStream.Length];
            Buffer.memcpy(_unmanagedStream.Pointer, 0, buffer, 0, (int) _unmanagedStream.Length);
            return buffer;
        } 

        public override void Write(byte[] buffer, int offset, int count) { 
            _unmanagedStream.Write(buffer, offset, count); 
        }
 
        public override void WriteByte(byte value) {
            _unmanagedStream.WriteByte(value);
        }
 
        // Writes this MemoryStream to another stream.
        public unsafe override void WriteTo(Stream stream) { 
            if (!_unmanagedStream._isOpen) __Error.StreamIsClosed(); 
            if (!_unmanagedStream.CanRead) __Error.ReadNotSupported();
            if (stream==null) 
                throw new ArgumentNullException("stream", Environment.GetResourceString("ArgumentNull_Stream"));

            byte[] buffer = ToArray();
 
            stream.Write(buffer, 0, buffer.Length);
        } 
    } 
}

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