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                         var rules = new List<TimeZoneInfo.AdjustmentRule> ();
  46                         while (input [0] != ';') {
  47                                 rules.Add (DeserializeAdjustmentRule (ref input));
  48                         }
  49                         var offsetSpan = TimeSpan.FromMinutes (offset);
  50                         return TimeZoneInfo.CreateCustomTimeZone (tzId, offsetSpan, displayName, standardName, daylightName, rules.ToArray ());
  51                 }
  52
  53                 public string ToSerializedString ()
  54                 {
  55                         var stb = new StringBuilder ();
  56                         var daylightName = (string.IsNullOrEmpty(this.DaylightName) ? this.StandardName : this.DaylightName);
  57                         stb.AppendFormat ("{0};{1};{2};{3};{4};", EscapeForSerialization (this.Id), (int)this.BaseUtcOffset.TotalMinutes,
  58                                 EscapeForSerialization (this.DisplayName), EscapeForSerialization (this.StandardName), EscapeForSerialization (daylightName));
  59
  60                         if (this.SupportsDaylightSavingTime) {
  61                                 foreach (var rule in this.GetAdjustmentRules()) {
  62                                         var start = rule.DateStart.ToString ("MM:dd:yyyy", CultureInfo.InvariantCulture);
  63                                         var end = rule.DateEnd.ToString ("MM:dd:yyyy", CultureInfo.InvariantCulture);
  64                                         var delta = (int)rule.DaylightDelta.TotalMinutes;
  65                                         var transitionStart = SerializeTransitionTime (rule.DaylightTransitionStart);
  66                                         var transitionEnd = SerializeTransitionTime (rule.DaylightTransitionEnd);
  67                                         stb.AppendFormat ("[{0};{1};{2};{3};{4};]", start, end, delta,
  68                                                 transitionStart, transitionEnd);
  69                                 }
  70                         }
  71
  72                         stb.Append (";");
  73                         return stb.ToString ();
  74                 }
  75
  76                 private static TimeZoneInfo.AdjustmentRule DeserializeAdjustmentRule (ref StringBuilder input)
  77                 {
  78                         // Similar to: [01:01:0001;12:31:9999;60;[0;01:00:00;3;5;0;];[0;02:00:00;10;5;0;];]
  79                         if (input [0] != '[')
  80                                 throw new SerializationException ();
  81                         input.Remove (0, 1); // [
  82                         var dateStart = DeserializeDate (ref input);
  83                         var dateEnd = DeserializeDate (ref input);
  84                         var delta = DeserializeInt (ref input);
  85                         var transitionStart = DeserializeTransitionTime (ref input);
  86                         var transitionEnd = DeserializeTransitionTime (ref input);
  87                         input.Remove (0, 1); // ]
  88                         var deltaSpan = TimeSpan.FromMinutes (delta);
  89                         return TimeZoneInfo.AdjustmentRule.CreateAdjustmentRule (dateStart, dateEnd, deltaSpan,
  90                                 transitionStart, transitionEnd);
  91                 }
  92
  93                 private static TimeZoneInfo.TransitionTime DeserializeTransitionTime (ref StringBuilder input)
  94                 {
  95                         if (input [0] != '[' || (input [1] != '0' && input [1] != '1') || input [2] != ';')
  96                                 throw new SerializationException ();
  97                         var rule = input [1];
  98                         input.Remove (0, 3); // [#;
  99                         var timeOfDay = DeserializeTime (ref input);
 100                         var month = DeserializeInt (ref input);
 101                         if (rule == '0') {
 102                                 // Floating rule such as: [0;01:00:00;3;5;0;];
 103                                 var week = DeserializeInt (ref input);
 104                                 var dayOfWeek = DeserializeInt (ref input);
 105                                 input.Remove (0, 2); // ];
 106                                 return TimeZoneInfo.TransitionTime.CreateFloatingDateRule (timeOfDay, month, week, (DayOfWeek)dayOfWeek);
 107                         }
 108
 109                         // Fixed rule such as: [1;02:15:59.999;6;2;];
 110                         var day = DeserializeInt (ref input);
 111                         input.Remove (0, 2); // ];
 112                         return TimeZoneInfo.TransitionTime.CreateFixedDateRule (timeOfDay, month, day);
 113                 }
 114
 115                 private static string DeserializeString (ref StringBuilder input)
 116                 {
 117                         var stb = new StringBuilder ();
 118                         var isEscaped = false;
 119                         int charCount;
 120                         for (charCount = 0; charCount < input.Length; charCount++) {
 121                                 var inChar = input [charCount];
 122                                 if (isEscaped) {
 123                                         isEscaped = false;
 124                                         stb.Append (inChar);
 125                                 } else if (inChar == '\\') {
 126                                         isEscaped = true;
 127                                         continue;
 128                                 } else if (inChar == ';') {
 129                                         break;
 130                                 } else {
 131                                         stb.Append (inChar);
 132                                 }
 133                         }
 134                         input.Remove (0, charCount + 1);
 135                         return stb.ToString ();
 136                 }
 137
 138                 private static int DeserializeInt(ref StringBuilder input)
 139                 {
 140                         int charCount = 0;
 141                         while(charCount++ < input.Length)
 142                         {
 143                                 if (input[charCount] == ';')
 144                                         break;
 145                         }
 146                         int result;
 147                         if(!int.TryParse(input.ToString(0, charCount), NumberStyles.Integer, CultureInfo.InvariantCulture, out result))
 148                                 throw new SerializationException();
 149                         input.Remove(0, charCount + 1);
 150                         return result;
 151                 }
 152
 153                 private static DateTime DeserializeDate (ref StringBuilder input)
 154                 {
 155                         var inChars = new char[11];
 156                         input.CopyTo (0, inChars, 0, inChars.Length);
 157                         DateTime result;
 158                         if (!DateTime.TryParseExact (new string (inChars), "MM:dd:yyyy;", CultureInfo.InvariantCulture, DateTimeStyles.None, out result))
 159                                 throw new SerializationException ();
 160                         input.Remove (0, inChars.Length);
 161                         return result;
 162                 }
 163
 164                 private static DateTime DeserializeTime (ref StringBuilder input)
 165                 {
 166                         if (input [8] == ';') {
 167                                 // Without milliseconds
 168                                 var inChars = new char[9];
 169                                 input.CopyTo (0, inChars, 0, inChars.Length);
 170                                 DateTime result;
 171                                 if (!DateTime.TryParseExact (new string (inChars), "HH:mm:ss;", CultureInfo.InvariantCulture, DateTimeStyles.NoCurrentDateDefault, out result))
 172                                         throw new SerializationException ();
 173                                 input.Remove (0, inChars.Length);
 174                                 return result;
 175                         } else if (input [12] == ';') {
 176                                 // With milliseconds
 177                                 char[] inChars = new char[13];
 178                                 input.CopyTo (0, inChars, 0, inChars.Length);
 179                                 var inString = new string (inChars);
 180                                 DateTime result;
 181                                 if (!DateTime.TryParseExact (inString, "HH:mm:ss.fff;", CultureInfo.InvariantCulture, DateTimeStyles.NoCurrentDateDefault, out result))
 182                                         throw new SerializationException ();
 183                                 input.Remove (0, inChars.Length);
 184                                 return result;
 185                         }
 186                         throw new SerializationException ();
 187                 }
 188
 189                 private static string EscapeForSerialization (string unescaped)
 190                 {
 191                         return unescaped.Replace (@"\", @"\\").Replace (";", "\\;");
 192                 }
 193
 194                 private static string SerializeTransitionTime (TimeZoneInfo.TransitionTime transition)
 195                 {
 196                         string timeOfDay;
 197                         if (transition.TimeOfDay.Millisecond > 0)
 198                                 timeOfDay = transition.TimeOfDay.ToString ("HH:mm:ss.fff");
 199                         else
 200                                 timeOfDay = transition.TimeOfDay.ToString ("HH:mm:ss");
 201
 202                         if (transition.IsFixedDateRule) {
 203                                 return string.Format ("[1;{0};{1};{2};]", timeOfDay, transition.Month, transition.Day);
 204                         }
 205
 206                         return string.Format ("[0;{0};{1};{2};{3};]", timeOfDay, transition.Month,
 207                                 transition.Week, (int)transition.DayOfWeek);
 208                 }
 209         }
 210 }