Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data/System/Data/SqlClient/SqlClientWrapperSmiStreamChars.cs

@@ -0,0 +1,128 @@
+//------------------------------------------------------------------------------
+// <copyright file="SqlClientWrapperSmiStream.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+// <owner current="true" primary="false">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace Microsoft.SqlServer.Server {
+    using System;
+    using System.Data.Common;
+    using System.Data.SqlClient;
+    using System.Data.SqlTypes;
+    using System.Diagnostics;
+    using System.IO;
+
+    // Simple SqlStreamChars wrapper over SmiStream that handles server events on the 
+    //  SqlClient side of Smi
+    internal class SqlClientWrapperSmiStreamChars : SqlStreamChars {
+
+        private SmiEventSink_Default    _sink;
+        private SmiStream               _stream;
+
+        internal SqlClientWrapperSmiStreamChars( SmiEventSink_Default sink, SmiStream stream ) {
+            Debug.Assert( null != sink );
+            Debug.Assert( null != stream );
+            _sink = sink;
+            _stream = stream;
+        }
+
+        public override bool IsNull {
+            get {
+                return null == _stream;
+            }
+        }
+
+        public override bool CanRead {
+            get {
+                return _stream.CanRead;
+            }
+        }
+
+        // If CanSeek is false, Position, Seek, Length, and SetLength should throw.
+        public override bool CanSeek {
+            get {
+                return _stream.CanSeek;
+            }
+        }
+
+        public override bool CanWrite {
+            get {
+                return _stream.CanWrite;
+            }
+        }
+
+        public override long Length {
+            get {
+                long length = _stream.GetLength( _sink );
+                _sink.ProcessMessagesAndThrow();
+                if ( length > 0 )
+                    return length / sizeof( char );
+                else
+                    return length;
+            }
+        }
+
+        public override long Position {
+            get {
+                long position = _stream.GetPosition( _sink ) / sizeof( char );
+                _sink.ProcessMessagesAndThrow();
+                return position;
+            }
+            set {
+                if ( value < 0 ) {
+                    throw ADP.ArgumentOutOfRange("Position");
+                }
+                _stream.SetPosition( _sink, value * sizeof( char ) );
+                _sink.ProcessMessagesAndThrow();
+            }
+        }
+
+        public override void Flush() {
+            _stream.Flush( _sink );
+            _sink.ProcessMessagesAndThrow();
+        }
+
+        public override long Seek(long offset, SeekOrigin origin) {
+            long result = _stream.Seek( _sink, offset * sizeof( char ), origin );
+            _sink.ProcessMessagesAndThrow();
+            return result;
+        }
+
+        public override void SetLength(long value) {
+            if ( value < 0 ) {
+                throw ADP.ArgumentOutOfRange("value");
+            }
+            _stream.SetLength( _sink, value * sizeof( char ) );
+            _sink.ProcessMessagesAndThrow();
+        }
+
+        public override int Read(char[] buffer, int offset, int count) {
+            int bytesRead = _stream.Read( _sink, buffer, offset * sizeof( char ), count );
+            _sink.ProcessMessagesAndThrow();
+            return bytesRead;
+        }
+
+        public override void Write(char[] buffer, int offset, int count) {
+            _stream.Write( _sink, buffer, offset, count );
+            _sink.ProcessMessagesAndThrow();
+        }
+
+        // Convenience methods to allow simple pulling/pushing of raw bytes
+        internal int Read(byte[] buffer, int offset, int count) {
+            int bytesRead = _stream.Read( _sink, buffer, offset, count );
+            _sink.ProcessMessagesAndThrow();
+            return bytesRead;
+        }
+
+        internal void Write(byte[] buffer, int offset, int count) {
+            _stream.Write( _sink, buffer, offset, count );
+            _sink.ProcessMessagesAndThrow();
+        }
+    }
+
+}
+
+
+