SabreTools/SabreTools.FileTypes/RVIO/Win32Native.cs

/******************************************************
 *     ROMVault3 is written by Gordon J.              *
 *     Contact gordon@romvault.com                    *
 *     Copyright 2020                                 *
 ******************************************************/

using System;
using System.IO;
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using System.Security.Permissions;
using System.Text;
using Microsoft.Win32.SafeHandles;

namespace RVIO
{
    internal static class Win32Native
    {
        private const string KERNEL32 = "kernel32.dll";


        [DllImport(KERNEL32, SetLastError = true, CharSet = CharSet.Auto, BestFitMapping = false)]
        [ResourceExposure(ResourceScope.Machine)]
        internal static extern int GetShortPathName(
            [MarshalAs(UnmanagedType.LPTStr)] string path,
            [MarshalAs(UnmanagedType.LPTStr)] StringBuilder shortPath,
            int shortPathLength
        );

    }
 
    public static class FileParamConvert
    {
        private const long TicksPerMillisecond = 10000;
        private const long TicksPerSecond = TicksPerMillisecond * 1000;
        private const long TicksPerMinute = TicksPerSecond * 60;
        private const long TicksPerHour = TicksPerMinute * 60;
        private const long TicksPerDay = TicksPerHour * 24;

        // Number of days in a non-leap year 
        private const int DaysPerYear = 365;
        // Number of days in 4 years 
        private const int DaysPer4Years = DaysPerYear * 4 + 1;
        // Number of days in 100 years
        private const int DaysPer100Years = DaysPer4Years * 25 - 1;
        // Number of days in 400 years
        private const int DaysPer400Years = DaysPer100Years * 4 + 1;

        // Number of days from 1/1/0001 to 12/31/1600 
        private const int DaysTo1601 = DaysPer400Years * 4;
        public const long FileTimeOffset = DaysTo1601 * TicksPerDay;
    }
}