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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.Runtime.CompilerServices;
#if BIT64
using nuint = System.UInt64;
#else
using nuint = System.UInt32;
#endif
namespace System.Runtime.InteropServices
{
public struct ArrayWithOffset
{
private object m_array;
private int m_offset;
private int m_count;
// From MAX_SIZE_FOR_INTEROP in mlinfo.h
private const int MaxSizeForInterop = 0x7ffffff0;
public ArrayWithOffset(object array, int offset)
{
int totalSize = 0;
if (array != null)
{
if (!(array is Array arrayObj) || (arrayObj.Rank != 1) || !Marshal.IsPinnable(arrayObj))
{
throw new ArgumentException(SR.Argument_NotIsomorphic);
}
nuint nativeTotalSize = (nuint)arrayObj.LongLength * (nuint)arrayObj.GetElementSize();
if (nativeTotalSize > MaxSizeForInterop)
{
throw new ArgumentException(SR.Argument_StructArrayTooLarge);
}
totalSize = (int)nativeTotalSize;
}
if ((uint)offset > (uint)totalSize)
{
throw new IndexOutOfRangeException(SR.IndexOutOfRange_ArrayWithOffset);
}
m_array = array;
m_offset = offset;
m_count = totalSize - offset;
}
public object GetArray() => m_array;
public int GetOffset() => m_offset;
public override int GetHashCode() => m_count + m_offset;
public override bool Equals(object obj)
{
return obj is ArrayWithOffset && Equals((ArrayWithOffset)obj);
}
public bool Equals(ArrayWithOffset obj)
{
return obj.m_array == m_array && obj.m_offset == m_offset && obj.m_count == m_count;
}
public static bool operator ==(ArrayWithOffset a, ArrayWithOffset b)
{
return a.Equals(b);
}
public static bool operator !=(ArrayWithOffset a, ArrayWithOffset b)
{
return !(a == b);
}
}
}
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