MdUtf8String.cs

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using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
 
namespace System;
 
internal readonly struct MdUtf8String
{
    private unsafe readonly byte* m_pStringHeap;
 
    private readonly int m_StringHeapByteLength;
 
    [DllImport("QCall", CharSet = CharSet.Unicode)]
    private unsafe static extern bool EqualsCaseInsensitive(void* szLhs, void* szRhs, int cSz);
 
    [DllImport("QCall", CharSet = CharSet.Unicode)]
    private unsafe static extern uint HashCaseInsensitive(void* sz, int cSz);
 
    internal unsafe MdUtf8String(void* pStringHeap)
    {
        if (pStringHeap != null)
        {
            m_StringHeapByteLength = string.strlen((byte*)pStringHeap);
        }
        else
        {
            m_StringHeapByteLength = 0;
        }
        m_pStringHeap = (byte*)pStringHeap;
    }
 
    internal unsafe MdUtf8String(byte* pUtf8String, int cUtf8String)
    {
        m_pStringHeap = pUtf8String;
        m_StringHeapByteLength = cUtf8String;
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    internal unsafe bool Equals(MdUtf8String s)
    {
        if (s.m_StringHeapByteLength != m_StringHeapByteLength)
        {
            return false;
        }
        return SpanHelpers.SequenceEqual(ref *s.m_pStringHeap, ref *m_pStringHeap, (uint)m_StringHeapByteLength);
    }
 
    internal unsafe bool EqualsCaseInsensitive(MdUtf8String s)
    {
        if (s.m_StringHeapByteLength != m_StringHeapByteLength)
        {
            return false;
        }
        if (m_StringHeapByteLength != 0)
        {
            return EqualsCaseInsensitive(s.m_pStringHeap, m_pStringHeap, m_StringHeapByteLength);
        }
        return true;
    }
 
    internal unsafe uint HashCaseInsensitive()
    {
        return HashCaseInsensitive(m_pStringHeap, m_StringHeapByteLength);
    }
 
    public unsafe override string ToString()
    {
        return Encoding.UTF8.GetString(new ReadOnlySpan<byte>(m_pStringHeap, m_StringHeapByteLength));
    }
}