mcs/class/corlib/System/TimeZoneInfo.Serialization.cs

   1 /*
   2  * System.TimeZoneInfo.Serialization
   3  *
   4  * Author(s)
   5  *      Sasha Kotlyar <sasha@arktronic.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining
   8  * a copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sublicense, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be
  16  * included in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  22  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 using System.Collections.Generic;
  28 using System.Globalization;
  29 using System.Runtime.Serialization;
  30 using System.Text;
  31
  32 namespace System
  33 {
  34         public
  35         partial class TimeZoneInfo
  36         {
  37                 public static TimeZoneInfo FromSerializedString (string source)
  38                 {
  39                         var input = new StringBuilder (source);
  40                         var tzId = DeserializeString (ref input);
  41                         var offset = DeserializeInt (ref input);
  42                         var displayName = DeserializeString (ref input);
  43                         var standardName = DeserializeString (ref input);
  44                         var daylightName = DeserializeString (ref input);
  45                         List<TimeZoneInfo.AdjustmentRule> rules = null;
  46                         while (input [0] != ';') {
  47                                 if (rules == null)
  48                                         rules = new List<TimeZoneInfo.AdjustmentRule> ();
  49                                 rules.Add (DeserializeAdjustmentRule (ref input));
  50                         }
  51                         var offsetSpan = TimeSpan.FromMinutes (offset);
  52                         return TimeZoneInfo.CreateCustomTimeZone (tzId, offsetSpan, displayName, standardName, daylightName, rules?.ToArray ());
  53                 }
  54
  55                 public string ToSerializedString ()
  56                 {
  57                         var stb = new StringBuilder ();
  58                         var daylightName = (string.IsNullOrEmpty(this.DaylightName) ? this.StandardName : this.DaylightName);
  59                         stb.AppendFormat ("{0};{1};{2};{3};{4};", EscapeForSerialization (this.Id), (int)this.BaseUtcOffset.TotalMinutes,
  60                                 EscapeForSerialization (this.DisplayName), EscapeForSerialization (this.StandardName), EscapeForSerialization (daylightName));
  61
  62                         if (this.SupportsDaylightSavingTime) {
  63                                 foreach (var rule in this.GetAdjustmentRules()) {
  64                                         var start = rule.DateStart.ToString ("MM:dd:yyyy", CultureInfo.InvariantCulture);
  65                                         var end = rule.DateEnd.ToString ("MM:dd:yyyy", CultureInfo.InvariantCulture);
  66                                         var delta = (int)rule.DaylightDelta.TotalMinutes;
  67                                         var transitionStart = SerializeTransitionTime (rule.DaylightTransitionStart);
  68                                         var transitionEnd = SerializeTransitionTime (rule.DaylightTransitionEnd);
  69                                         stb.AppendFormat ("[{0};{1};{2};{3};{4};]", start, end, delta,
  70                                                 transitionStart, transitionEnd);
  71                                 }
  72                         }
  73
  74                         stb.Append (";");
  75                         return stb.ToString ();
  76                 }
  77
  78                 private static TimeZoneInfo.AdjustmentRule DeserializeAdjustmentRule (ref StringBuilder input)
  79                 {
  80                         // Similar to: [01:01:0001;12:31:9999;60;[0;01:00:00;3;5;0;];[0;02:00:00;10;5;0;];]
  81                         if (input [0] != '[')
  82                                 throw new SerializationException ();
  83                         input.Remove (0, 1); // [
  84                         var dateStart = DeserializeDate (ref input);
  85                         var dateEnd = DeserializeDate (ref input);
  86                         var delta = DeserializeInt (ref input);
  87                         var transitionStart = DeserializeTransitionTime (ref input);
  88                         var transitionEnd = DeserializeTransitionTime (ref input);
  89                         input.Remove (0, 1); // ]
  90                         var deltaSpan = TimeSpan.FromMinutes (delta);
  91                         return TimeZoneInfo.AdjustmentRule.CreateAdjustmentRule (dateStart, dateEnd, deltaSpan,
  92                                 transitionStart, transitionEnd);
  93                 }
  94
  95                 private static TimeZoneInfo.TransitionTime DeserializeTransitionTime (ref StringBuilder input)
  96                 {
  97                         if (input [0] != '[' || (input [1] != '0' && input [1] != '1') || input [2] != ';')
  98                                 throw new SerializationException ();
  99                         var rule = input [1];
 100                         input.Remove (0, 3); // [#;
 101                         var timeOfDay = DeserializeTime (ref input);
 102                         var month = DeserializeInt (ref input);
 103                         if (rule == '0') {
 104                                 // Floating rule such as: [0;01:00:00;3;5;0;];
 105                                 var week = DeserializeInt (ref input);
 106                                 var dayOfWeek = DeserializeInt (ref input);
 107                                 input.Remove (0, 2); // ];
 108                                 return TimeZoneInfo.TransitionTime.CreateFloatingDateRule (timeOfDay, month, week, (DayOfWeek)dayOfWeek);
 109                         }
 110
 111                         // Fixed rule such as: [1;02:15:59.999;6;2;];
 112                         var day = DeserializeInt (ref input);
 113                         input.Remove (0, 2); // ];
 114                         return TimeZoneInfo.TransitionTime.CreateFixedDateRule (timeOfDay, month, day);
 115                 }
 116
 117                 private static string DeserializeString (ref StringBuilder input)
 118                 {
 119                         var stb = new StringBuilder ();
 120                         var isEscaped = false;
 121                         int charCount;
 122                         for (charCount = 0; charCount < input.Length; charCount++) {
 123                                 var inChar = input [charCount];
 124                                 if (isEscaped) {
 125                                         isEscaped = false;
 126                                         stb.Append (inChar);
 127                                 } else if (inChar == '\\') {
 128                                         isEscaped = true;
 129                                         continue;
 130                                 } else if (inChar == ';') {
 131                                         break;
 132                                 } else {
 133                                         stb.Append (inChar);
 134                                 }
 135                         }
 136                         input.Remove (0, charCount + 1);
 137                         return stb.ToString ();
 138                 }
 139
 140                 private static int DeserializeInt(ref StringBuilder input)
 141                 {
 142                         int charCount = 0;
 143                         while(charCount++ < input.Length)
 144                         {
 145                                 if (input[charCount] == ';')
 146                                         break;
 147                         }
 148                         int result;
 149                         if(!int.TryParse(input.ToString(0, charCount), NumberStyles.Integer, CultureInfo.InvariantCulture, out result))
 150                                 throw new SerializationException();
 151                         input.Remove(0, charCount + 1);
 152                         return result;
 153                 }
 154
 155                 private static DateTime DeserializeDate (ref StringBuilder input)
 156                 {
 157                         var inChars = new char[11];
 158                         input.CopyTo (0, inChars, 0, inChars.Length);
 159                         DateTime result;
 160                         if (!DateTime.TryParseExact (new string (inChars), "MM:dd:yyyy;", CultureInfo.InvariantCulture, DateTimeStyles.None, out result))
 161                                 throw new SerializationException ();
 162                         input.Remove (0, inChars.Length);
 163                         return result;
 164                 }
 165
 166                 private static DateTime DeserializeTime (ref StringBuilder input)
 167                 {
 168                         if (input [8] == ';') {
 169                                 // Without milliseconds
 170                                 var inChars = new char[9];
 171                                 input.CopyTo (0, inChars, 0, inChars.Length);
 172                                 DateTime result;
 173                                 if (!DateTime.TryParseExact (new string (inChars), "HH:mm:ss;", CultureInfo.InvariantCulture, DateTimeStyles.NoCurrentDateDefault, out result))
 174                                         throw new SerializationException ();
 175                                 input.Remove (0, inChars.Length);
 176                                 return result;
 177                         } else if (input [12] == ';') {
 178                                 // With milliseconds
 179                                 char[] inChars = new char[13];
 180                                 input.CopyTo (0, inChars, 0, inChars.Length);
 181                                 var inString = new string (inChars);
 182                                 DateTime result;
 183                                 if (!DateTime.TryParseExact (inString, "HH:mm:ss.fff;", CultureInfo.InvariantCulture, DateTimeStyles.NoCurrentDateDefault, out result))
 184                                         throw new SerializationException ();
 185                                 input.Remove (0, inChars.Length);
 186                                 return result;
 187                         }
 188                         throw new SerializationException ();
 189                 }
 190
 191                 private static string EscapeForSerialization (string unescaped)
 192                 {
 193                         return unescaped.Replace (@"\", @"\\").Replace (";", "\\;");
 194                 }
 195
 196                 private static string SerializeTransitionTime (TimeZoneInfo.TransitionTime transition)
 197                 {
 198                         string timeOfDay;
 199                         if (transition.TimeOfDay.Millisecond > 0)
 200                                 timeOfDay = transition.TimeOfDay.ToString ("HH:mm:ss.fff");
 201                         else
 202                                 timeOfDay = transition.TimeOfDay.ToString ("HH:mm:ss");
 203
 204                         if (transition.IsFixedDateRule) {
 205                                 return string.Format ("[1;{0};{1};{2};]", timeOfDay, transition.Month, transition.Day);
 206                         }
 207
 208                         return string.Format ("[0;{0};{1};{2};{3};]", timeOfDay, transition.Month,
 209                                 transition.Week, (int)transition.DayOfWeek);
 210                 }
 211         }
 212 }