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CoTaskMemBlock.cs
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211 lines (173 loc) · 5.53 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Runtime.InteropServices;
namespace Microsoft.ClearScript.Util
{
internal class CoTaskMemBlock : IDisposable
{
public IntPtr Addr { get; private set; }
public CoTaskMemBlock(int size)
{
Addr = Marshal.AllocCoTaskMem(size);
}
protected virtual void Dispose(bool disposing)
{
if (Addr != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(Addr);
Addr = IntPtr.Zero;
}
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
~CoTaskMemBlock()
{
Dispose(false);
}
}
internal sealed class CoTaskMemArrayBlock : CoTaskMemBlock
{
private readonly int elementSize;
private readonly int length;
public CoTaskMemArrayBlock(int elementSize, int length)
: base(elementSize * length)
{
this.elementSize = elementSize;
this.length = length;
}
public IntPtr GetAddr(int index)
{
if ((index < 0) || (index >= length))
{
throw new ArgumentOutOfRangeException("index");
}
if (Addr == IntPtr.Zero)
{
throw new ObjectDisposedException(ToString());
}
return GetAddrInternal(index);
}
private IntPtr GetAddrInternal(int index)
{
return Addr + (index * elementSize);
}
}
internal sealed class CoTaskMemVariantBlock : CoTaskMemBlock
{
public CoTaskMemVariantBlock()
: base(RawCOMHelpers.VariantSize)
{
NativeMethods.VariantInit(Addr);
}
public CoTaskMemVariantBlock(object obj)
: base(RawCOMHelpers.VariantSize)
{
Marshal.GetNativeVariantForObject(obj, Addr);
}
#region CoTaskMemBlock overrides
protected override void Dispose(bool disposing)
{
if (Addr != IntPtr.Zero)
{
NativeMethods.VariantClear(Addr);
}
base.Dispose(disposing);
}
#endregion
}
internal sealed class CoTaskMemVariantArgsBlock : CoTaskMemBlock
{
private readonly int length;
public CoTaskMemVariantArgsBlock(object[] args)
: base(args.Length * RawCOMHelpers.VariantSize)
{
length = args.Length;
for (var index = 0; index < length; index++)
{
Marshal.GetNativeVariantForObject(args[index], GetAddrInternal(length - 1 - index));
}
}
public IntPtr GetAddr(int index)
{
if ((index < 0) || (index >= length))
{
throw new ArgumentOutOfRangeException("index");
}
if (Addr == IntPtr.Zero)
{
throw new ObjectDisposedException(ToString());
}
return GetAddrInternal(length - 1 - index);
}
private IntPtr GetAddrInternal(int index)
{
return Addr + (index * RawCOMHelpers.VariantSize);
}
#region CoTaskMemBlock overrides
protected override void Dispose(bool disposing)
{
if (Addr != IntPtr.Zero)
{
for (var index = 0; index < length; index++)
{
NativeMethods.VariantClear(GetAddrInternal(index));
}
}
base.Dispose(disposing);
}
#endregion
}
internal sealed class CoTaskMemVariantArgsByRefBlock : CoTaskMemBlock
{
private readonly object[] args;
public CoTaskMemVariantArgsByRefBlock(object[] args)
: base(args.Length * 2 * RawCOMHelpers.VariantSize)
{
this.args = args;
for (var index = 0; index < args.Length; index++)
{
var pArg = GetAddrInternal(args.Length + index);
Marshal.GetNativeVariantForObject(args[index], pArg);
var pArgRef = GetAddrInternal(args.Length - 1 - index);
NativeMethods.VariantInit(pArgRef);
Marshal.WriteInt16(pArgRef, 0, 0x400C /*VT_BYREF|VT_VARIANT*/);
Marshal.WriteIntPtr(pArgRef, sizeof(ushort) * 4, pArg);
}
}
public IntPtr GetAddr(int index)
{
if ((index < 0) || (index >= args.Length))
{
throw new ArgumentOutOfRangeException("index");
}
if (Addr == IntPtr.Zero)
{
throw new ObjectDisposedException(ToString());
}
return GetAddrInternal(args.Length - 1 - index);
}
private IntPtr GetAddrInternal(int index)
{
return Addr + (index * RawCOMHelpers.VariantSize);
}
#region CoTaskMemBlock overrides
protected override void Dispose(bool disposing)
{
if (Addr != IntPtr.Zero)
{
for (var index = 0; index < args.Length; index++)
{
var pArg = GetAddrInternal(args.Length + index);
args[index] = Marshal.GetObjectForNativeVariant(pArg);
NativeMethods.VariantClear(pArg);
}
}
base.Dispose(disposing);
}
#endregion
}
}