SafeUnicodeStringHandle.cs

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using System;
using System.Runtime.InteropServices;
 
namespace Microsoft.Win32.SafeHandles;
 
internal sealed class SafeUnicodeStringHandle : SafeHandle
{
    public sealed override bool IsInvalid => handle == IntPtr.Zero;
 
    public SafeUnicodeStringHandle(string s)
        : base(IntPtr.Zero, ownsHandle: true)
    {
        handle = Marshal.StringToHGlobalUni(s);
    }
 
    public unsafe SafeUnicodeStringHandle(ReadOnlySpan<char> s)
        : base(IntPtr.Zero, ownsHandle: true)
    {
        checked
        {
            if (s != default(ReadOnlySpan<char>))
            {
                int num = s.Length + 1;
                int cb = num * 2;
                handle = Marshal.AllocHGlobal(cb);
                Span<char> destination = new Span<char>(handle.ToPointer(), num);
                s.CopyTo(destination);
                destination[s.Length] = '\0';
            }
        }
    }
 
    protected sealed override bool ReleaseHandle()
    {
        Marshal.FreeHGlobal(handle);
        return true;
    }
}