Win32Marshal.cs

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using System.Runtime.InteropServices;
 
namespace System.IO;
 
internal static class Win32Marshal
{
    internal static Exception GetExceptionForLastWin32Error(string path = "")
    {
        return GetExceptionForWin32Error(Marshal.GetLastWin32Error(), path);
    }
 
    internal static Exception GetExceptionForWin32Error(int errorCode, string path = "")
    {
        switch (errorCode)
        {
        case 2:
            return new FileNotFoundException(string.IsNullOrEmpty(path) ? SR.IO_FileNotFound : SR.Format(SR.IO_FileNotFound_FileName, path), path);
        case 3:
            return new DirectoryNotFoundException(string.IsNullOrEmpty(path) ? SR.IO_PathNotFound_NoPathName : SR.Format(SR.IO_PathNotFound_Path, path));
        case 5:
            return new UnauthorizedAccessException(string.IsNullOrEmpty(path) ? SR.UnauthorizedAccess_IODenied_NoPathName : SR.Format(SR.UnauthorizedAccess_IODenied_Path, path));
        case 183:
            if (!string.IsNullOrEmpty(path))
            {
                return new IOException(SR.Format(SR.IO_AlreadyExists_Name, path), MakeHRFromErrorCode(errorCode));
            }
            break;
        case 206:
            return new PathTooLongException(string.IsNullOrEmpty(path) ? SR.IO_PathTooLong : SR.Format(SR.IO_PathTooLong_Path, path));
        case 32:
            return new IOException(string.IsNullOrEmpty(path) ? SR.IO_SharingViolation_NoFileName : SR.Format(SR.IO_SharingViolation_File, path), MakeHRFromErrorCode(errorCode));
        case 80:
            if (!string.IsNullOrEmpty(path))
            {
                return new IOException(SR.Format(SR.IO_FileExists_Name, path), MakeHRFromErrorCode(errorCode));
            }
            break;
        case 995:
            return new OperationCanceledException();
        }
        return new IOException(string.IsNullOrEmpty(path) ? GetMessage(errorCode) : (GetMessage(errorCode) + " : '" + path + "'"), MakeHRFromErrorCode(errorCode));
    }
 
    internal static int MakeHRFromErrorCode(int errorCode)
    {
        if ((0xFFFF0000u & errorCode) != 0L)
        {
            return errorCode;
        }
        return -2147024896 | errorCode;
    }
 
    internal static string GetMessage(int errorCode)
    {
        return Interop.Kernel32.GetMessage(errorCode);
    }
}