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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.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 ICollection`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 VectorToCollectionAdapter objects. Rather, they are of type
// IVector<T>. No actual VectorToCollectionAdapter object is ever instantiated. Thus, you will see
// a lot of expressions that cast "this" to "IVector<T>".
internal sealed class VectorToCollectionAdapter
{
private VectorToCollectionAdapter()
{
Contract.Assert(false, "This class is never instantiated");
}
// int Count { get }
[Pure]
[SecurityCritical]
internal int Count<T>()
{
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
uint size = _this.Size;
if (((uint)Int32.MaxValue) < size)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CollectionBackingListTooLarge"));
}
return (int)size;
}
// bool IsReadOnly { get }
[SecurityCritical]
internal bool IsReadOnly<T>()
{
return false;
}
// void Add(T item)
[SecurityCritical]
internal void Add<T>(T item)
{
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
_this.Append(item);
}
// void Clear()
[SecurityCritical]
internal void Clear<T>()
{
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
_this.Clear();
}
// bool Contains(T item)
[SecurityCritical]
internal bool Contains<T>(T item)
{
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
uint index;
return _this.IndexOf(item, out index);
}
// void CopyTo(T[] array, int arrayIndex)
[SecurityCritical]
internal void CopyTo<T>(T[] array, int arrayIndex)
{
if (array == null)
throw new ArgumentNullException("array");
if (arrayIndex < 0)
throw new ArgumentOutOfRangeException("arrayIndex");
if (array.Length <= arrayIndex && Count<T>() > 0)
throw new ArgumentException(Environment.GetResourceString("Argument_IndexOutOfArrayBounds"));
if (array.Length - arrayIndex < Count<T>())
throw new ArgumentException(Environment.GetResourceString("Argument_InsufficientSpaceToCopyCollection"));
Contract.EndContractBlock();
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
int count = Count<T>();
for (int i = 0; i < count; i++)
{
array[i + arrayIndex] = VectorToListAdapter.GetAt<T>(_this, (uint)i);
}
}
// bool Remove(T item)
[SecurityCritical]
internal bool Remove<T>(T item)
{
IVector<T> _this = JitHelpers.UnsafeCast<IVector<T>>(this);
uint index;
bool exists = _this.IndexOf(item, out index);
if (!exists)
return false;
if (((uint)Int32.MaxValue) < index)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CollectionBackingListTooLarge"));
}
VectorToListAdapter.RemoveAtHelper<T>(_this, index);
return true;
}
}
}
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