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//
// Image.cs
//
// Author:
// Jb Evain (jbevain@novell.com)
//
// (C) 2009 - 2010 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;
using System.IO;
namespace Mono.Reflection {
public sealed class Image : IDisposable {
long position;
Stream stream;
Image (Stream stream)
{
this.stream = stream;
this.position = stream.Position;
this.stream.Position = 0;
}
bool Advance (int length)
{
if (stream.Position + length >= stream.Length)
return false;
stream.Seek (length, SeekOrigin.Current);
return true;
}
bool MoveTo (uint position)
{
if (position >= stream.Length)
return false;
stream.Position = position;
return true;
}
void IDisposable.Dispose ()
{
stream.Position = position;
}
ushort ReadUInt16 ()
{
return (ushort) (stream.ReadByte ()
| (stream.ReadByte () << 8));
}
uint ReadUInt32 ()
{
return (uint) (stream.ReadByte ()
| (stream.ReadByte () << 8)
| (stream.ReadByte () << 16)
| (stream.ReadByte () << 24));
}
bool IsManagedAssembly ()
{
if (stream.Length < 318)
return false;
if (ReadUInt16 () != 0x5a4d)
return false;
if (!Advance (58))
return false;
if (!MoveTo (ReadUInt32 ()))
return false;
if (ReadUInt32 () != 0x00004550)
return false;
if (!Advance (20))
return false;
if (!Advance (ReadUInt16 () == 0x20b ? 222 : 206))
return false;
return ReadUInt32 () != 0;
}
public static bool IsAssembly (string file)
{
if (file == null)
throw new ArgumentNullException ("file");
using (var stream = new FileStream (file, FileMode.Open, FileAccess.Read, FileShare.Read))
return IsAssembly (stream);
}
public static bool IsAssembly (Stream stream)
{
if (stream == null)
throw new ArgumentNullException ("stream");
if (!stream.CanRead)
throw new ArgumentException ("Can not read from stream");
if (!stream.CanSeek)
throw new ArgumentException ("Can not seek in stream");
using (var image = new Image (stream))
return image.IsManagedAssembly ();
}
}
}
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