mirror of
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389 lines
17 KiB
C#
389 lines
17 KiB
C#
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// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : DateHandlers.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Helpers.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Convert several timestamp formats to C# DateTime.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2021 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Text;
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using Aaru.Console;
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namespace Aaru.Helpers
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{
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/// <summary>Helper operations for timestamp management (date and time)</summary>
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public static class DateHandlers
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{
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static readonly DateTime _lisaEpoch = new DateTime(1901, 1, 1, 0, 0, 0);
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static readonly DateTime _macEpoch = new DateTime(1904, 1, 1, 0, 0, 0);
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static readonly DateTime _unixEpoch = new DateTime(1970, 1, 1, 0, 0, 0);
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/// <summary>Day 0 of Julian Date system</summary>
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static readonly DateTime _julianEpoch = new DateTime(1858, 11, 17, 0, 0, 0);
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static readonly DateTime _amigaEpoch = new DateTime(1978, 1, 1, 0, 0, 0);
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/// <summary>Converts a Macintosh timestamp to a .NET DateTime</summary>
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/// <param name="macTimeStamp">Macintosh timestamp (seconds since 1st Jan. 1904)</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime MacToDateTime(ulong macTimeStamp) => _macEpoch.AddTicks((long)(macTimeStamp * 10000000));
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/// <summary>Converts a Lisa timestamp to a .NET DateTime</summary>
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/// <param name="lisaTimeStamp">Lisa timestamp (seconds since 1st Jan. 1901)</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime LisaToDateTime(uint lisaTimeStamp) => _lisaEpoch.AddSeconds(lisaTimeStamp);
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/// <summary>Converts a UNIX timestamp to a .NET DateTime</summary>
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/// <param name="unixTimeStamp">UNIX timestamp (seconds since 1st Jan. 1970)</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime UnixToDateTime(int unixTimeStamp) => _unixEpoch.AddSeconds(unixTimeStamp);
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/// <summary>Converts a UNIX timestamp to a .NET DateTime</summary>
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/// <param name="unixTimeStamp">UNIX timestamp (seconds since 1st Jan. 1970)</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime UnixToDateTime(long unixTimeStamp) => _unixEpoch.AddSeconds(unixTimeStamp);
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/// <summary>Converts a UNIX timestamp to a .NET DateTime</summary>
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/// <param name="unixTimeStamp">UNIX timestamp (seconds since 1st Jan. 1970)</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime UnixUnsignedToDateTime(uint unixTimeStamp) => _unixEpoch.AddSeconds(unixTimeStamp);
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/// <summary>Converts a UNIX timestamp to a .NET DateTime</summary>
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/// <param name="seconds">Seconds since 1st Jan. 1970)</param>
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/// <param name="nanoseconds">Nanoseconds</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime UnixUnsignedToDateTime(uint seconds, uint nanoseconds) =>
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_unixEpoch.AddSeconds(seconds).AddTicks((long)nanoseconds / 100);
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/// <summary>Converts a UNIX timestamp to a .NET DateTime</summary>
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/// <param name="unixTimeStamp">UNIX timestamp (seconds since 1st Jan. 1970)</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime UnixUnsignedToDateTime(ulong unixTimeStamp) => _unixEpoch.AddSeconds(unixTimeStamp);
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/// <summary>Converts a High Sierra Format timestamp to a .NET DateTime</summary>
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/// <param name="vdDateTime">High Sierra Format timestamp</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime HighSierraToDateTime(byte[] vdDateTime)
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{
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byte[] isoTime = new byte[17];
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Array.Copy(vdDateTime, 0, isoTime, 0, 16);
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return Iso9660ToDateTime(isoTime);
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}
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// TODO: Timezone
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/// <summary>Converts an ISO9660 timestamp to a .NET DateTime</summary>
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/// <param name="vdDateTime">ISO9660 timestamp</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime Iso9660ToDateTime(byte[] vdDateTime)
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{
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byte[] twoCharValue = new byte[2];
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byte[] fourCharValue = new byte[4];
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fourCharValue[0] = vdDateTime[0];
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fourCharValue[1] = vdDateTime[1];
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fourCharValue[2] = vdDateTime[2];
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fourCharValue[3] = vdDateTime[3];
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AaruConsole.DebugWriteLine("ISO9600ToDateTime handler", "year = \"{0}\"",
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StringHandlers.CToString(fourCharValue, Encoding.ASCII));
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if(!int.TryParse(StringHandlers.CToString(fourCharValue, Encoding.ASCII), out int year))
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year = 0;
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twoCharValue[0] = vdDateTime[4];
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twoCharValue[1] = vdDateTime[5];
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AaruConsole.DebugWriteLine("ISO9600ToDateTime handler", "month = \"{0}\"",
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StringHandlers.CToString(twoCharValue, Encoding.ASCII));
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if(!int.TryParse(StringHandlers.CToString(twoCharValue, Encoding.ASCII), out int month))
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month = 0;
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twoCharValue[0] = vdDateTime[6];
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twoCharValue[1] = vdDateTime[7];
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AaruConsole.DebugWriteLine("ISO9600ToDateTime handler", "day = \"{0}\"",
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StringHandlers.CToString(twoCharValue, Encoding.ASCII));
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if(!int.TryParse(StringHandlers.CToString(twoCharValue, Encoding.ASCII), out int day))
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day = 0;
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twoCharValue[0] = vdDateTime[8];
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twoCharValue[1] = vdDateTime[9];
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AaruConsole.DebugWriteLine("ISO9600ToDateTime handler", "hour = \"{0}\"",
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StringHandlers.CToString(twoCharValue, Encoding.ASCII));
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if(!int.TryParse(StringHandlers.CToString(twoCharValue, Encoding.ASCII), out int hour))
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hour = 0;
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twoCharValue[0] = vdDateTime[10];
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twoCharValue[1] = vdDateTime[11];
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AaruConsole.DebugWriteLine("ISO9600ToDateTime handler", "minute = \"{0}\"",
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StringHandlers.CToString(twoCharValue, Encoding.ASCII));
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if(!int.TryParse(StringHandlers.CToString(twoCharValue, Encoding.ASCII), out int minute))
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minute = 0;
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twoCharValue[0] = vdDateTime[12];
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twoCharValue[1] = vdDateTime[13];
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AaruConsole.DebugWriteLine("ISO9600ToDateTime handler", "second = \"{0}\"",
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StringHandlers.CToString(twoCharValue, Encoding.ASCII));
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if(!int.TryParse(StringHandlers.CToString(twoCharValue, Encoding.ASCII), out int second))
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second = 0;
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twoCharValue[0] = vdDateTime[14];
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twoCharValue[1] = vdDateTime[15];
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AaruConsole.DebugWriteLine("ISO9600ToDateTime handler", "hundredths = \"{0}\"",
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StringHandlers.CToString(twoCharValue, Encoding.ASCII));
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if(!int.TryParse(StringHandlers.CToString(twoCharValue, Encoding.ASCII), out int hundredths))
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hundredths = 0;
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AaruConsole.DebugWriteLine("ISO9600ToDateTime handler",
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"decodedDT = new DateTime({0}, {1}, {2}, {3}, {4}, {5}, {6}, DateTimeKind.Unspecified);",
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year, month, day, hour, minute, second, hundredths * 10);
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sbyte difference = (sbyte)vdDateTime[16];
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var decodedDt = new DateTime(year, month, day, hour, minute, second, hundredths * 10, DateTimeKind.Utc);
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return decodedDt.AddMinutes(difference * -15);
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}
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/// <summary>Converts a VMS timestamp to a .NET DateTime</summary>
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/// <param name="vmsDate">VMS timestamp (tenths of microseconds since day 0 of the Julian Date)</param>
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/// <returns>.NET DateTime</returns>
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/// <remarks>C# works in UTC, VMS on Julian Date, some displacement may occur on disks created outside UTC</remarks>
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public static DateTime VmsToDateTime(ulong vmsDate)
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{
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double delta = vmsDate * 0.0001; // Tenths of microseconds to milliseconds, will lose some detail
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return _julianEpoch.AddMilliseconds(delta);
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}
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/// <summary>Converts an Amiga timestamp to a .NET DateTime</summary>
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/// <param name="days">Days since the 1st Jan. 1978</param>
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/// <param name="minutes">Minutes since o'clock</param>
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/// <param name="ticks">Ticks</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime AmigaToDateTime(uint days, uint minutes, uint ticks)
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{
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DateTime temp = _amigaEpoch.AddDays(days);
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temp = temp.AddMinutes(minutes);
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return temp.AddMilliseconds(ticks * 20);
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}
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/// <summary>Converts an UCSD Pascal timestamp to a .NET DateTime</summary>
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/// <param name="dateRecord">UCSD Pascal timestamp</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime UcsdPascalToDateTime(short dateRecord)
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{
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int year = ((dateRecord & 0xFE00) >> 9) + 1900;
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int day = (dateRecord & 0x01F0) >> 4;
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int month = dateRecord & 0x000F;
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AaruConsole.DebugWriteLine("UCSDPascalToDateTime handler",
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"dateRecord = 0x{0:X4}, year = {1}, month = {2}, day = {3}", dateRecord, year,
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month, day);
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return new DateTime(year, month, day);
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}
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/// <summary>Converts a DOS timestamp to a .NET DateTime</summary>
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/// <param name="date">Date</param>
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/// <param name="time">Time</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime DosToDateTime(ushort date, ushort time)
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{
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int year = ((date & 0xFE00) >> 9) + 1980;
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int month = (date & 0x1E0) >> 5;
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int day = date & 0x1F;
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int hour = (time & 0xF800) >> 11;
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int minute = (time & 0x7E0) >> 5;
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int second = (time & 0x1F) * 2;
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AaruConsole.DebugWriteLine("DOSToDateTime handler", "date = 0x{0:X4}, year = {1}, month = {2}, day = {3}",
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date, year, month, day);
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AaruConsole.DebugWriteLine("DOSToDateTime handler",
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"time = 0x{0:X4}, hour = {1}, minute = {2}, second = {3}", time, hour, minute,
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second);
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DateTime dosDate;
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try
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{
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dosDate = new DateTime(year, month, day, hour, minute, second);
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}
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catch(ArgumentOutOfRangeException)
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{
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dosDate = new DateTime(1980, 1, 1, 0, 0, 0);
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}
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return dosDate;
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}
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/// <summary>Converts a CP/M timestamp to .NET DateTime</summary>
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/// <param name="timestamp">CP/M timestamp</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime CpmToDateTime(byte[] timestamp)
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{
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ushort days = BitConverter.ToUInt16(timestamp, 0);
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int hours = timestamp[2];
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int minutes = timestamp[3];
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DateTime temp = _amigaEpoch.AddDays(days);
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temp = temp.AddHours(hours);
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temp = temp.AddMinutes(minutes);
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return temp;
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}
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/// <summary>Converts an ECMA timestamp to a .NET DateTime</summary>
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/// <param name="typeAndTimeZone">Timezone</param>
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/// <param name="year">Year</param>
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/// <param name="month">Month</param>
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/// <param name="day">Day</param>
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/// <param name="hour">Hour</param>
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/// <param name="minute">Minute</param>
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/// <param name="second">Second</param>
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/// <param name="centiseconds">Centiseconds</param>
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/// <param name="hundredsOfMicroseconds">Hundreds of microseconds</param>
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/// <param name="microseconds">Microseconds</param>
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/// <returns></returns>
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public static DateTime EcmaToDateTime(ushort typeAndTimeZone, short year, byte month, byte day, byte hour,
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byte minute, byte second, byte centiseconds, byte hundredsOfMicroseconds,
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byte microseconds)
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{
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byte specification = (byte)((typeAndTimeZone & 0xF000) >> 12);
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long ticks = ((long)centiseconds * 100000) + ((long)hundredsOfMicroseconds * 1000) +
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((long)microseconds * 10);
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if(specification == 0)
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return new DateTime(year, month, day, hour, minute, second, DateTimeKind.Utc).AddTicks(ticks);
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ushort preOffset = (ushort)(typeAndTimeZone & 0xFFF);
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short offset;
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if((preOffset & 0x800) == 0x800)
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offset = (short)(preOffset | 0xF000);
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else
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offset = (short)(preOffset & 0x7FF);
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if(offset == -2047)
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return new DateTime(year, month, day, hour, minute, second, DateTimeKind.Unspecified).AddTicks(ticks);
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if(offset < -1440 ||
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offset > 1440)
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offset = 0;
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return new DateTimeOffset(year, month, day, hour, minute, second, new TimeSpan(0, offset, 0)).
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AddTicks(ticks).DateTime;
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}
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/// <summary>Converts a Solaris high resolution timestamp to .NET DateTime</summary>
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/// <param name="hrTimeStamp">Solaris high resolution timestamp</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime UnixHrTimeToDateTime(ulong hrTimeStamp) =>
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_unixEpoch.AddTicks((long)(hrTimeStamp / 100));
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/// <summary>Converts an OS-9 timestamp to .NET DateTime</summary>
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/// <param name="date">OS-9 timestamp</param>
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/// <returns>.NET DateTime</returns>
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public static DateTime Os9ToDateTime(byte[] date)
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{
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if(date == null ||
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(date.Length != 3 && date.Length != 5))
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return DateTime.MinValue;
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DateTime os9Date;
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try
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{
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os9Date = date.Length == 5 ? new DateTime(1900 + date[0], date[1], date[2], date[3], date[4], 0)
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: new DateTime(1900 + date[0], date[1], date[2], 0, 0, 0);
|
||
|
|
}
|
||
|
|
catch(ArgumentOutOfRangeException)
|
||
|
|
{
|
||
|
|
os9Date = new DateTime(1900, 0, 0, 0, 0, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
return os9Date;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>Converts a LIF timestamp to .NET DateTime</summary>
|
||
|
|
/// <param name="date">LIF timestamp</param>
|
||
|
|
/// <returns>.NET DateTime</returns>
|
||
|
|
public static DateTime LifToDateTime(byte[] date)
|
||
|
|
{
|
||
|
|
if(date == null ||
|
||
|
|
date.Length != 6)
|
||
|
|
return new DateTime(1970, 1, 1, 0, 0, 0);
|
||
|
|
|
||
|
|
return LifToDateTime(date[0], date[1], date[2], date[3], date[4], date[5]);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>Converts a LIF timestamp to .NET DateTime</summary>
|
||
|
|
/// <param name="year">Yer</param>
|
||
|
|
/// <param name="month">Month</param>
|
||
|
|
/// <param name="day">Day</param>
|
||
|
|
/// <param name="hour">Hour</param>
|
||
|
|
/// <param name="minute">Minute</param>
|
||
|
|
/// <param name="second">Second</param>
|
||
|
|
/// <returns>.NET DateTime</returns>
|
||
|
|
public static DateTime LifToDateTime(byte year, byte month, byte day, byte hour, byte minute, byte second)
|
||
|
|
{
|
||
|
|
try
|
||
|
|
{
|
||
|
|
int iyear = ((year >> 4) * 10) + (year & 0xF);
|
||
|
|
int imonth = ((month >> 4) * 10) + (month & 0xF);
|
||
|
|
int iday = ((day >> 4) * 10) + (day & 0xF);
|
||
|
|
int iminute = ((minute >> 4) * 10) + (minute & 0xF);
|
||
|
|
int ihour = ((hour >> 4) * 10) + (hour & 0xF);
|
||
|
|
int isecond = ((second >> 4) * 10) + (second & 0xF);
|
||
|
|
|
||
|
|
if(iyear >= 70)
|
||
|
|
iyear += 1900;
|
||
|
|
else
|
||
|
|
iyear += 2000;
|
||
|
|
|
||
|
|
return new DateTime(iyear, imonth, iday, ihour, iminute, isecond);
|
||
|
|
}
|
||
|
|
catch(ArgumentOutOfRangeException)
|
||
|
|
{
|
||
|
|
return new DateTime(1970, 1, 1, 0, 0, 0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|