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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Dtf.WindowsInstaller
{
using System;
using System.IO;
internal class RecordStream : Stream
{
private Record record;
private int field;
private long position;
internal RecordStream(Record record, int field)
: base()
{
this.record = record;
this.field = field;
}
public override bool CanRead { get { return true; } }
public override bool CanWrite { get { return false; } }
public override bool CanSeek { get { return false; } }
public override long Length
{
get
{
return this.record.GetDataSize(this.field);
}
}
public override long Position
{
get
{
return this.position;
}
set
{
throw new NotSupportedException();
}
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override void SetLength(long value)
{
throw new NotSupportedException();
}
public override void Flush()
{
throw new NotSupportedException();
}
public override int Read(byte[] buffer, int offset, int count)
{
if (count > 0)
{
byte[] readBuffer = (offset == 0 ? buffer : new byte[count]);
uint ucount = (uint) count;
uint ret = RemotableNativeMethods.MsiRecordReadStream((int) this.record.Handle, (uint) this.field, buffer, ref ucount);
if (ret != 0)
{
throw InstallerException.ExceptionFromReturnCode(ret);
}
count = (int) ucount;
if (offset > 0)
{
Array.Copy(readBuffer, 0, buffer, offset, count);
}
this.position += count;
}
return count;
}
public override void Write(byte[] array, int offset, int count)
{
throw new NotSupportedException();
}
public override string ToString()
{
return "[Binary data]";
}
}
}
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