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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
{
// This is a set of stub methods implementing the support for the IList`1 interface on WinRT
// objects that support IVector`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 VectorToListAdapter objects. Rather, they are of type
// IVector<T>. No actual VectorToListAdapter object is ever instantiated. Thus, you will see
// a lot of expressions that cast "this" to "IVector<T>".
internal sealed class VectorToListAdapter
{
private VectorToListAdapter()
{
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));
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
return GetAt(_this, (uint)index);
}
// T this[int index] { set }
internal void Indexer_Set<T>(int index, T value)
{
if (index < 0)
throw new ArgumentOutOfRangeException(nameof(index));
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
SetAt(_this, (uint)index, value);
}
// int IndexOf(T item)
internal int IndexOf<T>(T item)
{
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
uint index;
bool exists = _this.IndexOf(item, out index);
if (!exists)
return -1;
if (((uint)Int32.MaxValue) < index)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CollectionBackingListTooLarge"));
}
return (int)index;
}
// void Insert(int index, T item)
internal void Insert<T>(int index, T item)
{
if (index < 0)
throw new ArgumentOutOfRangeException(nameof(index));
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
InsertAtHelper<T>(_this, (uint)index, item);
}
// void RemoveAt(int index)
internal void RemoveAt<T>(int index)
{
if (index < 0)
throw new ArgumentOutOfRangeException(nameof(index));
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
RemoveAtHelper<T>(_this, (uint)index);
}
// Helpers:
internal static T GetAt<T>(IVector<T> _this, uint index)
{
try
{
return _this.GetAt(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;
}
}
private static void SetAt<T>(IVector<T> _this, UInt32 index, T value)
{
try
{
_this.SetAt(index, value);
// We deligate 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;
}
}
private static void InsertAtHelper<T>(IVector<T> _this, uint index, T item)
{
try
{
_this.InsertAt(index, item);
// 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;
}
}
internal static void RemoveAtHelper<T>(IVector<T> _this, uint index)
{
try
{
_this.RemoveAt(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;
}
}
}
}
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