playtest-unity/playtest/Library/PackageCache/com.unity.ide.visualstudio@.../Editor/Image.cs

103 lines
2.2 KiB
C#

/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
using System;
using System.IO;
namespace Microsoft.Unity.VisualStudio.Editor
{
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(nameof(stream));
if (!stream.CanRead)
throw new ArgumentException(nameof(stream));
if (!stream.CanSeek)
throw new ArgumentException(nameof(stream));
using (var image = new Image(stream))
return image.IsManagedAssembly();
}
}
}