diff options
Diffstat (limited to 'src/mscorlib/shared/System/IO/UnmanagedMemoryStreamWrapper.cs')
-rw-r--r-- | src/mscorlib/shared/System/IO/UnmanagedMemoryStreamWrapper.cs | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/IO/UnmanagedMemoryStreamWrapper.cs b/src/mscorlib/shared/System/IO/UnmanagedMemoryStreamWrapper.cs new file mode 100644 index 0000000000..d547e771d7 --- /dev/null +++ b/src/mscorlib/shared/System/IO/UnmanagedMemoryStreamWrapper.cs @@ -0,0 +1,210 @@ +// Licensed to the .NET Foundation under one or more agreements. +// The .NET Foundation licenses this file to you under the MIT license. +// See the LICENSE file in the project root for more information. + +/*============================================================ +** +** +** +** +** Purpose: Create a Memorystream over an UnmanagedMemoryStream +** +===========================================================*/ + +using System; +using System.Runtime.InteropServices; +using System.Diagnostics.CodeAnalysis; +using System.Diagnostics.Contracts; +using System.Threading; +using System.Threading.Tasks; + +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.Dispose(); + } + finally + { + base.Dispose(disposing); + } + } + + public override void Flush() + { + _unmanagedStream.Flush(); + } + + public override byte[] GetBuffer() + { + throw new UnauthorizedAccessException(SR.UnauthorizedAccess_MemStreamBuffer); + } + + public override bool TryGetBuffer(out ArraySegment<byte> buffer) + { + buffer = default(ArraySegment<byte>); + return false; + } + + public override int Capacity + { + get + { + return (int)_unmanagedStream.Capacity; + } + [SuppressMessage("Microsoft.Contracts", "CC1055")] // Skip extra error checking to avoid *potential* AppCompat problems. + set + { + throw new IOException(SR.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(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() + { + byte[] buffer = new byte[_unmanagedStream.Length]; + _unmanagedStream.Read(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 (stream == null) + throw new ArgumentNullException(nameof(stream), SR.ArgumentNull_Stream); + Contract.EndContractBlock(); + + byte[] buffer = ToArray(); + + stream.Write(buffer, 0, buffer.Length); + } + + public override void SetLength(Int64 value) + { + // This was probably meant to call _unmanagedStream.SetLength(value), but it was forgotten in V.4.0. + // Now this results in a call to the base which touches the underlying array which is never actually used. + // We cannot fix it due to compat now, but we should fix this at the next SxS release oportunity. + base.SetLength(value); + } + + + public override Task CopyToAsync(Stream destination, Int32 bufferSize, CancellationToken cancellationToken) + { + // The parameter checks must be in sync with the base version: + if (destination == null) + throw new ArgumentNullException(nameof(destination)); + + if (bufferSize <= 0) + throw new ArgumentOutOfRangeException(nameof(bufferSize), SR.ArgumentOutOfRange_NeedPosNum); + + if (!CanRead && !CanWrite) + throw new ObjectDisposedException(null, SR.ObjectDisposed_StreamClosed); + + if (!destination.CanRead && !destination.CanWrite) + throw new ObjectDisposedException(nameof(destination), SR.ObjectDisposed_StreamClosed); + + if (!CanRead) + throw new NotSupportedException(SR.NotSupported_UnreadableStream); + + if (!destination.CanWrite) + throw new NotSupportedException(SR.NotSupported_UnwritableStream); + + Contract.EndContractBlock(); + + return _unmanagedStream.CopyToAsync(destination, bufferSize, cancellationToken); + } + + + public override Task FlushAsync(CancellationToken cancellationToken) + { + return _unmanagedStream.FlushAsync(cancellationToken); + } + + + public override Task<Int32> ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken) + { + return _unmanagedStream.ReadAsync(buffer, offset, count, cancellationToken); + } + + + public override Task WriteAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken) + { + return _unmanagedStream.WriteAsync(buffer, offset, count, cancellationToken); + } + } // class UnmanagedMemoryStreamWrapper +} // namespace + |