223 lines
6.7 KiB
C#
223 lines
6.7 KiB
C#
/*
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KeePass Password Safe - The Open-Source Password Manager
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Copyright (C) 2003-2012 Dominik Reichl <dominik.reichl@t-online.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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using System;
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using System.Diagnostics;
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namespace KeePassLib.Utility
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{
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/// <summary>
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/// Contains various static time structure manipulation and conversion
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/// routines.
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/// </summary>
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public static class TimeUtil
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{
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/// <summary>
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/// Length of a compressed <c>PW_TIME</c> structure in bytes.
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/// </summary>
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public const int PwTimeLength = 7;
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/// <summary>
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/// Pack a <c>DateTime</c> object into 5 bytes. Layout: 2 zero bits,
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/// year 12 bits, month 4 bits, day 5 bits, hour 5 bits, minute 6
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/// bits, second 6 bits.
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/// </summary>
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/// <param name="dt"></param>
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/// <returns></returns>
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public static byte[] PackTime(DateTime dt)
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{
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byte[] pb = new byte[5];
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// Pack time to 5 byte structure:
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// Byte bits: 11111111 22222222 33333333 44444444 55555555
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// Contents : 00YYYYYY YYYYYYMM MMDDDDDH HHHHMMMM MMSSSSSS
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pb[0] = (byte)((dt.Year >> 6) & 0x3F);
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pb[1] = (byte)(((dt.Year & 0x3F) << 2) | ((dt.Month >> 2) & 0x03));
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pb[2] = (byte)(((dt.Month & 0x03) << 6) | ((dt.Day & 0x1F) << 1) |
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((dt.Hour >> 4) & 0x01));
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pb[3] = (byte)(((dt.Hour & 0x0F) << 4) | ((dt.Minute >> 2) & 0x0F));
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pb[4] = (byte)(((dt.Minute & 0x03) << 6) | (dt.Second & 0x3F));
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return pb;
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}
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/// <summary>
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/// Unpack a packed time (5 bytes, packed by the <c>PackTime</c>
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/// member function) to a <c>DateTime</c> object.
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/// </summary>
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/// <param name="pb">Packed time, 5 bytes.</param>
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/// <returns>Unpacked <c>DateTime</c> object.</returns>
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public static DateTime UnpackTime(byte[] pb)
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{
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Debug.Assert((pb != null) && (pb.Length == 5));
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if(pb == null) throw new ArgumentNullException("pb");
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if(pb.Length != 5) throw new ArgumentException();
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int n1 = pb[0], n2 = pb[1], n3 = pb[2], n4 = pb[3], n5 = pb[4];
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// Unpack 5 byte structure to date and time
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int nYear = (n1 << 6) | (n2 >> 2);
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int nMonth = ((n2 & 0x00000003) << 2) | (n3 >> 6);
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int nDay = (n3 >> 1) & 0x0000001F;
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int nHour = ((n3 & 0x00000001) << 4) | (n4 >> 4);
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int nMinute = ((n4 & 0x0000000F) << 2) | (n5 >> 6);
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int nSecond = n5 & 0x0000003F;
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return new DateTime(nYear, nMonth, nDay, nHour, nMinute, nSecond);
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}
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/// <summary>
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/// Pack a <c>DateTime</c> object into 7 bytes (<c>PW_TIME</c>).
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/// </summary>
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/// <param name="dt">Object to be encoded.</param>
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/// <returns>Packed time, 7 bytes (<c>PW_TIME</c>).</returns>
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public static byte[] PackPwTime(DateTime dt)
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{
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Debug.Assert(PwTimeLength == 7);
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byte[] pb = new byte[7];
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pb[0] = (byte)(dt.Year & 0xFF);
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pb[1] = (byte)(dt.Year >> 8);
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pb[2] = (byte)dt.Month;
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pb[3] = (byte)dt.Day;
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pb[4] = (byte)dt.Hour;
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pb[5] = (byte)dt.Minute;
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pb[6] = (byte)dt.Second;
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return pb;
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}
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/// <summary>
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/// Unpack a packed time (7 bytes, <c>PW_TIME</c>) to a <c>DateTime</c> object.
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/// </summary>
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/// <param name="pb">Packed time, 7 bytes.</param>
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/// <returns>Unpacked <c>DateTime</c> object.</returns>
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public static DateTime UnpackPwTime(byte[] pb)
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{
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Debug.Assert(PwTimeLength == 7);
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Debug.Assert(pb != null); if(pb == null) throw new ArgumentNullException("pb");
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Debug.Assert(pb.Length == 7); if(pb.Length != 7) throw new ArgumentException();
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return new DateTime(((int)pb[1] << 8) | (int)pb[0], (int)pb[2], (int)pb[3],
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(int)pb[4], (int)pb[5], (int)pb[6]);
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}
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/// <summary>
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/// Convert a <c>DateTime</c> object to a displayable string.
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/// </summary>
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/// <param name="dt"><c>DateTime</c> object to convert to a string.</param>
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/// <returns>String representing the specified <c>DateTime</c> object.</returns>
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public static string ToDisplayString(DateTime dt)
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{
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return dt.ToString();
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}
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public static string ToDisplayStringDateOnly(DateTime dt)
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{
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return dt.ToString("d");
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}
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public static DateTime FromDisplayString(string strDisplay)
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{
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DateTime dt;
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#if !KeePassLibSD
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if(DateTime.TryParse(strDisplay, out dt)) return dt;
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#else
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try { dt = DateTime.Parse(strDisplay); return dt; }
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catch(Exception) { }
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#endif
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Debug.Assert(false);
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return DateTime.Now;
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}
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public static string SerializeUtc(DateTime dt)
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{
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string str = dt.ToUniversalTime().ToString("s");
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if(str.EndsWith("Z") == false) str += "Z";
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return str;
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}
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public static bool TryDeserializeUtc(string str, out DateTime dt)
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{
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if(str == null) throw new ArgumentNullException("str");
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if(str.EndsWith("Z")) str = str.Substring(0, str.Length - 1);
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bool bResult = StrUtil.TryParseDateTime(str, out dt);
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if(bResult) dt = dt.ToLocalTime();
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return bResult;
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}
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private static DateTime? m_dtUnixRoot = null;
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public static DateTime ConvertUnixTime(double dtUnix)
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{
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try
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{
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if(!m_dtUnixRoot.HasValue)
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m_dtUnixRoot = (new DateTime(1970, 1, 1, 0, 0, 0, 0,
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DateTimeKind.Utc)).ToLocalTime();
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return m_dtUnixRoot.Value.AddSeconds(dtUnix);
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}
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catch(Exception) { Debug.Assert(false); }
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return DateTime.Now;
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}
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#if !KeePassLibSD
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private static string[] m_vUSMonths = null;
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/// <summary>
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/// Parse a US textual date string, like e.g. "January 02, 2012".
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/// </summary>
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public static DateTime? ParseUSTextDate(string strDate)
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{
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if(strDate == null) { Debug.Assert(false); return null; }
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if(m_vUSMonths == null)
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m_vUSMonths = new string[]{ "January", "February", "March",
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"April", "May", "June", "July", "August", "September",
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"October", "November", "December" };
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string str = strDate.Trim();
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for(int i = 0; i < m_vUSMonths.Length; ++i)
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{
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if(str.StartsWith(m_vUSMonths[i], StrUtil.CaseIgnoreCmp))
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{
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str = str.Substring(m_vUSMonths[i].Length);
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string[] v = str.Split(new char[]{ ',', ';' });
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if((v == null) || (v.Length != 2)) return null;
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string strDay = v[0].Trim().TrimStart('0');
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int iDay, iYear;
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if(int.TryParse(strDay, out iDay) &&
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int.TryParse(v[1].Trim(), out iYear))
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return new DateTime(iYear, i + 1, iDay);
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else { Debug.Assert(false); return null; }
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}
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}
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return null;
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}
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#endif
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}
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}
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