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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
using System;
using System.Security;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
namespace System.Runtime.InteropServices.WindowsRuntime
{
internal delegate T Indexer_Get_Delegate<out T>(int index);
// This is a set of stub methods implementing the support for the IReadOnlyList`1 interface on WinRT
// objects that support IVectorView`1. Used by the interop mashaling infrastructure.
//
// The methods on this class must be written VERY carefully to avoid introducing security holes.
// That's because they are invoked with special "this"! The "this" object
// for all of these methods are not IVectorViewToIReadOnlyListAdapter objects. Rather, they are of type
// IVectorView<T>. No actual IVectorViewToIReadOnlyListAdapter object is ever instantiated. Thus, you will see
// a lot of expressions that cast "this" to "IVectorView<T>".
[DebuggerDisplay("Count = {Count}")]
internal sealed class IVectorViewToIReadOnlyListAdapter
{
private IVectorViewToIReadOnlyListAdapter()
{
Debug.Assert(false, "This class is never instantiated");
}
// T this[int index] { get }
internal T Indexer_Get<T>(int index)
{
if (index < 0)
throw new ArgumentOutOfRangeException(nameof(index));
IVectorView<T> _this = JitHelpers.UnsafeCast<IVectorView<T>>(this);
try
{
return _this.GetAt((uint) index);
// We delegate bounds checking to the underlying collection and if it detected a fault,
// we translate it to the right exception:
}
catch (Exception ex)
{
if (__HResults.E_BOUNDS == ex._HResult)
throw new ArgumentOutOfRangeException(nameof(index));
throw;
}
}
// T this[int index] { get }
internal T Indexer_Get_Variance<T>(int index) where T : class
{
bool fUseString;
Delegate target = System.StubHelpers.StubHelpers.GetTargetForAmbiguousVariantCall(
this,
typeof(IReadOnlyList<T>).TypeHandle.Value,
out fUseString);
if (target != null)
{
return (JitHelpers.UnsafeCast<Indexer_Get_Delegate<T>>(target))(index);
}
if (fUseString)
{
return JitHelpers.UnsafeCast<T>(Indexer_Get<string>(index));
}
return Indexer_Get<T>(index);
}
}
}
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