717 lines
19 KiB
C#
717 lines
19 KiB
C#
//
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// System.Drawing.ComIStreamMarshaler.cs
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//
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// Author:
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// Kornél Pál <http://www.kornelpal.hu/>
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//
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// Copyright (C) 2005-2006 Kornél Pál
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// Undefine to debug the protected blocks
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#define MAP_EX_TO_HR
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// Define to debug wrappers recursively
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// #define RECURSIVE_WRAPPING
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using System;
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using System.IO;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Runtime.InteropServices.ComTypes;
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using STATSTG = System.Runtime.InteropServices.ComTypes.STATSTG;
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namespace System.Drawing
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{
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// Mono does not implement COM interface marshaling
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// This custom marshaler should be replaced with UnmanagedType.Interface
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// Provides identical behaviour under Mono and .NET Framework
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internal sealed class ComIStreamMarshaler : ICustomMarshaler
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{
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private const int S_OK = 0x00000000;
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private const int E_NOINTERFACE = unchecked((int)0x80004002);
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private delegate int QueryInterfaceDelegate(IntPtr @this, [In()] ref Guid riid, IntPtr ppvObject);
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private delegate int AddRefDelegate(IntPtr @this);
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private delegate int ReleaseDelegate(IntPtr @this);
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private delegate int ReadDelegate(IntPtr @this, [Out(), MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)] byte[] pv, int cb, IntPtr pcbRead);
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private delegate int WriteDelegate(IntPtr @this, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)] byte[] pv, int cb, IntPtr pcbWritten);
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private delegate int SeekDelegate(IntPtr @this, long dlibMove, int dwOrigin, IntPtr plibNewPosition);
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private delegate int SetSizeDelegate(IntPtr @this, long libNewSize);
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private delegate int CopyToDelegate(IntPtr @this, [MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(ComIStreamMarshaler))] IStream pstm, long cb, IntPtr pcbRead, IntPtr pcbWritten);
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private delegate int CommitDelegate(IntPtr @this, int grfCommitFlags);
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private delegate int RevertDelegate(IntPtr @this);
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private delegate int LockRegionDelegate(IntPtr @this, long libOffset, long cb, int dwLockType);
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private delegate int UnlockRegionDelegate(IntPtr @this, long libOffset, long cb, int dwLockType);
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private delegate int StatDelegate(IntPtr @this, out STATSTG pstatstg, int grfStatFlag);
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private delegate int CloneDelegate(IntPtr @this, out IntPtr ppstm);
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[StructLayout(LayoutKind.Sequential)]
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private sealed class IStreamInterface
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{
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internal IntPtr lpVtbl;
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internal IntPtr gcHandle;
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}
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[StructLayout(LayoutKind.Sequential)]
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private sealed class IStreamVtbl
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{
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internal QueryInterfaceDelegate QueryInterface;
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internal AddRefDelegate AddRef;
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internal ReleaseDelegate Release;
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internal ReadDelegate Read;
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internal WriteDelegate Write;
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internal SeekDelegate Seek;
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internal SetSizeDelegate SetSize;
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internal CopyToDelegate CopyTo;
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internal CommitDelegate Commit;
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internal RevertDelegate Revert;
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internal LockRegionDelegate LockRegion;
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internal UnlockRegionDelegate UnlockRegion;
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internal StatDelegate Stat;
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internal CloneDelegate Clone;
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}
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// Managed COM Callable Wrapper implementation
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// Reference counting is thread safe
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private sealed class ManagedToNativeWrapper
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{
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// Mono does not implement Marshal.Release
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[StructLayout(LayoutKind.Sequential)]
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private sealed class ReleaseSlot
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{
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internal ReleaseDelegate Release;
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}
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private static readonly Guid IID_IUnknown = new Guid("00000000-0000-0000-C000-000000000046");
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private static readonly Guid IID_IStream = new Guid("0000000C-0000-0000-C000-000000000046");
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private static readonly MethodInfo exceptionGetHResult = typeof(Exception).GetProperty("HResult", BindingFlags.GetProperty | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.DeclaredOnly | BindingFlags.ExactBinding, null, typeof(int), new Type[] {}, null).GetGetMethod(true);
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// Keeps delegates alive while they are marshaled
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private static readonly IStreamVtbl managedVtable;
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private static IntPtr comVtable;
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private static int vtableRefCount;
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private IStream managedInterface;
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private IntPtr comInterface;
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// Keeps the object alive when it has no managed references
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private GCHandle gcHandle;
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private int refCount = 1;
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static ManagedToNativeWrapper()
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{
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EventHandler onShutdown;
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AppDomain currentDomain;
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IStreamVtbl newVtable;
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onShutdown = new EventHandler(OnShutdown);
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currentDomain = AppDomain.CurrentDomain;
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currentDomain.DomainUnload += onShutdown;
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currentDomain.ProcessExit += onShutdown;
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newVtable = new IStreamVtbl();
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newVtable.QueryInterface = new QueryInterfaceDelegate(QueryInterface);
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newVtable.AddRef = new AddRefDelegate(AddRef);
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newVtable.Release = new ReleaseDelegate(Release);
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newVtable.Read = new ReadDelegate(Read);
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newVtable.Write = new WriteDelegate(Write);
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newVtable.Seek = new SeekDelegate(Seek);
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newVtable.SetSize = new SetSizeDelegate(SetSize);
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newVtable.CopyTo = new CopyToDelegate(CopyTo);
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newVtable.Commit = new CommitDelegate(Commit);
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newVtable.Revert = new RevertDelegate(Revert);
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newVtable.LockRegion = new LockRegionDelegate(LockRegion);
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newVtable.UnlockRegion = new UnlockRegionDelegate(UnlockRegion);
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newVtable.Stat = new StatDelegate(Stat);
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newVtable.Clone = new CloneDelegate(Clone);
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managedVtable = newVtable;
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CreateVtable();
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}
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private ManagedToNativeWrapper(IStream managedInterface)
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{
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IStreamInterface newInterface;
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lock (managedVtable)
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{
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// Vtable may have been disposed when shutting down
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if (vtableRefCount == 0 && comVtable == IntPtr.Zero)
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CreateVtable();
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vtableRefCount++;
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}
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try
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{
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this.managedInterface = managedInterface;
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gcHandle = GCHandle.Alloc(this);
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newInterface = new IStreamInterface();
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newInterface.lpVtbl = comVtable;
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newInterface.gcHandle = (IntPtr)gcHandle;
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comInterface = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(IStreamInterface)));
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Marshal.StructureToPtr(newInterface, comInterface, false);
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}
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catch
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{
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this.Dispose();
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throw;
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}
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}
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private void Dispose()
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{
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if (gcHandle.IsAllocated)
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gcHandle.Free();
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if (comInterface != IntPtr.Zero)
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{
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Marshal.FreeHGlobal(comInterface);
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comInterface = IntPtr.Zero;
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}
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managedInterface = null;
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lock (managedVtable)
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{
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// Dispose vtable when shutting down
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if (--vtableRefCount == 0 && Environment.HasShutdownStarted)
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DisposeVtable();
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}
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}
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private static void OnShutdown(object sender, EventArgs e)
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{
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lock (managedVtable)
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{
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// There may be object instances when shutting down
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if (vtableRefCount == 0 && comVtable != IntPtr.Zero)
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DisposeVtable();
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}
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}
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private static void CreateVtable()
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{
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comVtable = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(IStreamVtbl)));
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Marshal.StructureToPtr(managedVtable, comVtable, false);
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}
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private static void DisposeVtable()
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{
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Marshal.DestroyStructure(comVtable, typeof(IStreamVtbl));
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Marshal.FreeHGlobal(comVtable);
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comVtable = IntPtr.Zero;
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}
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internal static IStream GetUnderlyingInterface(IntPtr comInterface, bool outParam)
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{
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if (Marshal.ReadIntPtr(comInterface) == comVtable)
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{
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IStream managedInterface = GetObject(comInterface).managedInterface;
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if (outParam)
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Release(comInterface);
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return managedInterface;
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}
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else
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return null;
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}
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internal static IntPtr GetInterface(IStream managedInterface)
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{
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IntPtr comInterface;
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if (managedInterface == null)
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return IntPtr.Zero;
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#if !RECURSIVE_WRAPPING
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else if ((comInterface = NativeToManagedWrapper.GetUnderlyingInterface(managedInterface)) == IntPtr.Zero)
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#endif
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comInterface = new ManagedToNativeWrapper(managedInterface).comInterface;
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return comInterface;
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}
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internal static void ReleaseInterface(IntPtr comInterface)
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{
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if (comInterface != IntPtr.Zero)
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{
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IntPtr vtable = Marshal.ReadIntPtr(comInterface);
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if (vtable == comVtable)
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Release(comInterface);
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else
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{
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ReleaseSlot releaseSlot = (ReleaseSlot)Marshal.PtrToStructure((IntPtr)((long)vtable + (long)(IntPtr.Size * 2)), typeof(ReleaseSlot));
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releaseSlot.Release(comInterface);
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}
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}
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}
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// Mono does not implement Marshal.GetHRForException
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private static int GetHRForException(Exception e)
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{
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return (int)exceptionGetHResult.Invoke(e, null);
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}
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private static ManagedToNativeWrapper GetObject(IntPtr @this)
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{
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return (ManagedToNativeWrapper)((GCHandle)Marshal.ReadIntPtr(@this, IntPtr.Size)).Target;
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}
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private static int QueryInterface(IntPtr @this, ref Guid riid, IntPtr ppvObject)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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if (IID_IUnknown.Equals(riid) || IID_IStream.Equals(riid))
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{
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Marshal.WriteIntPtr(ppvObject, @this);
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AddRef(@this);
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return S_OK;
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}
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else
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{
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Marshal.WriteIntPtr(ppvObject, IntPtr.Zero);
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return E_NOINTERFACE;
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}
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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private static int AddRef(IntPtr @this)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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ManagedToNativeWrapper thisObject = GetObject(@this);
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lock (thisObject)
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{
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return ++thisObject.refCount;
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}
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#if MAP_EX_TO_HR
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}
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catch
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{
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return 0;
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}
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#endif
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}
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private static int Release(IntPtr @this)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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ManagedToNativeWrapper thisObject = GetObject(@this);
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lock (thisObject)
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{
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if ((thisObject.refCount != 0) && (--thisObject.refCount == 0))
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thisObject.Dispose();
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return thisObject.refCount;
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}
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#if MAP_EX_TO_HR
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}
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catch
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{
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return 0;
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}
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#endif
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}
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private static int Read(IntPtr @this, byte[] pv, int cb, IntPtr pcbRead)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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GetObject(@this).managedInterface.Read(pv, cb, pcbRead);
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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private static int Write(IntPtr @this, byte[] pv, int cb, IntPtr pcbWritten)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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GetObject(@this).managedInterface.Write(pv, cb, pcbWritten);
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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private static int Seek(IntPtr @this, long dlibMove, int dwOrigin, IntPtr plibNewPosition)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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GetObject(@this).managedInterface.Seek(dlibMove, dwOrigin, plibNewPosition);
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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private static int SetSize(IntPtr @this, long libNewSize)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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GetObject(@this).managedInterface.SetSize(libNewSize);
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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private static int CopyTo(IntPtr @this, IStream pstm, long cb, IntPtr pcbRead, IntPtr pcbWritten)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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GetObject(@this).managedInterface.CopyTo(pstm, cb, pcbRead, pcbWritten);
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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private static int Commit(IntPtr @this, int grfCommitFlags)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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GetObject(@this).managedInterface.Commit(grfCommitFlags);
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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private static int Revert(IntPtr @this)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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GetObject(@this).managedInterface.Revert();
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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private static int LockRegion(IntPtr @this, long libOffset, long cb, int dwLockType)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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GetObject(@this).managedInterface.LockRegion(libOffset, cb, dwLockType);
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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private static int UnlockRegion(IntPtr @this, long libOffset, long cb, int dwLockType)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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GetObject(@this).managedInterface.UnlockRegion(libOffset, cb, dwLockType);
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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private static int Stat(IntPtr @this, out STATSTG pstatstg, int grfStatFlag)
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{
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#if MAP_EX_TO_HR
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try
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{
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#endif
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GetObject(@this).managedInterface.Stat(out pstatstg, grfStatFlag);
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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pstatstg = new STATSTG();
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return GetHRForException(e);
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}
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#endif
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}
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private static int Clone(IntPtr @this, out IntPtr ppstm)
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{
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ppstm = IntPtr.Zero;
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#if MAP_EX_TO_HR
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try
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{
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#endif
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IStream newInterface;
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GetObject(@this).managedInterface.Clone(out newInterface);
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ppstm = ManagedToNativeWrapper.GetInterface(newInterface);
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return S_OK;
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#if MAP_EX_TO_HR
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}
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catch (Exception e)
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{
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return GetHRForException(e);
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}
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#endif
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}
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}
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// Managed Runtime Callable Wrapper implementation
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private sealed class NativeToManagedWrapper : IStream
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{
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private IntPtr comInterface;
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private IStreamVtbl managedVtable;
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private NativeToManagedWrapper(IntPtr comInterface, bool outParam)
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{
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this.comInterface = comInterface;
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managedVtable = (IStreamVtbl)Marshal.PtrToStructure(Marshal.ReadIntPtr(comInterface), typeof(IStreamVtbl));
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if (!outParam)
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managedVtable.AddRef(comInterface);
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}
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~NativeToManagedWrapper()
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{
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Dispose(false);
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}
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private void Dispose(bool disposing)
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{
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managedVtable.Release(comInterface);
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if (disposing)
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{
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comInterface = IntPtr.Zero;
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|
managedVtable = null;
|
|
GC.SuppressFinalize(this);
|
|
}
|
|
}
|
|
|
|
internal static IntPtr GetUnderlyingInterface(IStream managedInterface)
|
|
{
|
|
if (managedInterface is NativeToManagedWrapper)
|
|
{
|
|
NativeToManagedWrapper wrapper = (NativeToManagedWrapper)managedInterface;
|
|
|
|
wrapper.managedVtable.AddRef(wrapper.comInterface);
|
|
return wrapper.comInterface;
|
|
}
|
|
else
|
|
return IntPtr.Zero;
|
|
}
|
|
|
|
internal static IStream GetInterface(IntPtr comInterface, bool outParam)
|
|
{
|
|
IStream managedInterface;
|
|
|
|
if (comInterface == IntPtr.Zero)
|
|
return null;
|
|
#if !RECURSIVE_WRAPPING
|
|
else if ((managedInterface = ManagedToNativeWrapper.GetUnderlyingInterface(comInterface, outParam)) == null)
|
|
#endif
|
|
managedInterface = (IStream)new NativeToManagedWrapper(comInterface, outParam);
|
|
|
|
return managedInterface;
|
|
}
|
|
|
|
internal static void ReleaseInterface(IStream managedInterface)
|
|
{
|
|
if (managedInterface is NativeToManagedWrapper)
|
|
((NativeToManagedWrapper)managedInterface).Dispose(true);
|
|
}
|
|
|
|
// Mono does not implement Marshal.ThrowExceptionForHR
|
|
private static void ThrowExceptionForHR(int result)
|
|
{
|
|
if (result < 0)
|
|
throw new COMException(null, result);
|
|
}
|
|
|
|
public void Read(byte[] pv, int cb, IntPtr pcbRead)
|
|
{
|
|
ThrowExceptionForHR(managedVtable.Read(comInterface, pv, cb, pcbRead));
|
|
}
|
|
|
|
public void Write(byte[] pv, int cb, IntPtr pcbWritten)
|
|
{
|
|
ThrowExceptionForHR(managedVtable.Write(comInterface, pv, cb, pcbWritten));
|
|
}
|
|
|
|
public void Seek(long dlibMove, int dwOrigin, IntPtr plibNewPosition)
|
|
{
|
|
ThrowExceptionForHR(managedVtable.Seek(comInterface, dlibMove, dwOrigin, plibNewPosition));
|
|
}
|
|
|
|
public void SetSize(long libNewSize)
|
|
{
|
|
ThrowExceptionForHR(managedVtable.SetSize(comInterface, libNewSize));
|
|
}
|
|
|
|
public void CopyTo(IStream pstm, long cb, IntPtr pcbRead, IntPtr pcbWritten)
|
|
{
|
|
ThrowExceptionForHR(managedVtable.CopyTo(comInterface, pstm, cb, pcbRead, pcbWritten));
|
|
}
|
|
|
|
public void Commit(int grfCommitFlags)
|
|
{
|
|
ThrowExceptionForHR(managedVtable.Commit(comInterface, grfCommitFlags));
|
|
}
|
|
|
|
public void Revert()
|
|
{
|
|
ThrowExceptionForHR(managedVtable.Revert(comInterface));
|
|
}
|
|
|
|
public void LockRegion(long libOffset, long cb, int dwLockType)
|
|
{
|
|
ThrowExceptionForHR(managedVtable.LockRegion(comInterface, libOffset, cb, dwLockType));
|
|
}
|
|
|
|
public void UnlockRegion(long libOffset, long cb, int dwLockType)
|
|
{
|
|
ThrowExceptionForHR(managedVtable.UnlockRegion(comInterface, libOffset, cb, dwLockType));
|
|
}
|
|
|
|
public void Stat(out STATSTG pstatstg, int grfStatFlag)
|
|
{
|
|
ThrowExceptionForHR(managedVtable.Stat(comInterface, out pstatstg, grfStatFlag));
|
|
}
|
|
|
|
public void Clone(out IStream ppstm)
|
|
{
|
|
IntPtr newInterface;
|
|
|
|
ThrowExceptionForHR(managedVtable.Clone(comInterface, out newInterface));
|
|
ppstm = NativeToManagedWrapper.GetInterface(newInterface, true);
|
|
}
|
|
}
|
|
|
|
private static readonly ComIStreamMarshaler defaultInstance = new ComIStreamMarshaler();
|
|
|
|
private ComIStreamMarshaler()
|
|
{
|
|
}
|
|
|
|
private static ICustomMarshaler GetInstance(string cookie)
|
|
{
|
|
return defaultInstance;
|
|
}
|
|
|
|
public IntPtr MarshalManagedToNative(object managedObj)
|
|
{
|
|
#if RECURSIVE_WRAPPING
|
|
managedObj = NativeToManagedWrapper.GetInterface(ManagedToNativeWrapper.GetInterface((IStream)managedObj), true);
|
|
#endif
|
|
return ManagedToNativeWrapper.GetInterface((IStream)managedObj);
|
|
}
|
|
|
|
public void CleanUpNativeData(IntPtr pNativeData)
|
|
{
|
|
ManagedToNativeWrapper.ReleaseInterface(pNativeData);
|
|
}
|
|
|
|
public object MarshalNativeToManaged(IntPtr pNativeData)
|
|
{
|
|
#if RECURSIVE_WRAPPING
|
|
pNativeData = ManagedToNativeWrapper.GetInterface(NativeToManagedWrapper.GetInterface(pNativeData, true));
|
|
#endif
|
|
return NativeToManagedWrapper.GetInterface(pNativeData, false);
|
|
}
|
|
|
|
public void CleanUpManagedData(object managedObj)
|
|
{
|
|
NativeToManagedWrapper.ReleaseInterface((IStream)managedObj);
|
|
}
|
|
|
|
public int GetNativeDataSize()
|
|
{
|
|
return -1;
|
|
}
|
|
}
|
|
}
|