//
// System.Web.TempFileStream.cs
//
// Authors:
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// Copyright (C) 2006 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.IO;
using System.Runtime.InteropServices;
namespace System.Web{
internal class TempFileStream : FileStream {
bool read_mode;
bool disposed;
long saved_position;
public TempFileStream (string name)
: base (name, FileMode.Create, FileAccess.ReadWrite, FileShare.None, 8192)
{
}
public override bool CanRead {
get { return read_mode; }
}
public override bool CanWrite {
get { return !read_mode; }
}
public void SavePosition ()
{
saved_position = Position;
Position = 0;
}
public void RestorePosition ()
{
Position = saved_position;
saved_position = -1;
}
public void SetReadOnly ()
{
read_mode = true;
Position = 0;
}
public void SetWriteOnly ()
{
read_mode = false;
Position = 0;
}
public override void Write (byte [] buffer, int offset, int count)
{
if (read_mode)
throw new InvalidOperationException ("mode read");
base.Write (buffer, offset, count);
}
public override int Read ([In,Out] byte [] buffer, int offset, int count)
{
if (!read_mode)
throw new InvalidOperationException ("mode write");
return base.Read (buffer, offset, count);
}
protected override void Dispose (bool disposing)
{
if (!disposed) {
disposed = true;
base.Dispose (disposing);
try {
File.Delete (Name);
} catch {}
}
}
}
}
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