MemoryMapLightUp.cs

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using System.IO;
using System.IO.MemoryMappedFiles;
using System.Runtime.InteropServices;
 
namespace System.Reflection.Internal;
 
internal static class MemoryMapLightUp
{
    internal static bool IsAvailable => true;
 
    internal static IDisposable CreateMemoryMap(Stream stream)
    {
        return MemoryMappedFile.CreateFromFile((FileStream)stream, null, 0L, MemoryMappedFileAccess.Read, HandleInheritability.None, leaveOpen: true);
    }
 
    internal static IDisposable CreateViewAccessor(object memoryMap, long start, int size)
    {
        try
        {
            return ((MemoryMappedFile)memoryMap).CreateViewAccessor(start, size, MemoryMappedFileAccess.Read);
        }
        catch (UnauthorizedAccessException ex)
        {
            throw new IOException(ex.Message, ex);
        }
    }
 
    internal static bool TryGetSafeBufferAndPointerOffset(object accessor, out SafeBuffer safeBuffer, out long offset)
    {
        MemoryMappedViewAccessor memoryMappedViewAccessor = (MemoryMappedViewAccessor)accessor;
        safeBuffer = memoryMappedViewAccessor.SafeMemoryMappedViewHandle;
        offset = memoryMappedViewAccessor.PointerOffset;
        return true;
    }
}