mcs/class/System.Core/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 #if (INSIDE_CORLIB && NET_4_0) || (!INSIDE_CORLIB && (NET_3_5 && !NET_4_0 && !MOBILE))
  28
  29 using System.Collections.Generic;
  30 using System.Globalization;
  31 using System.Runtime.Serialization;
  32 using System.Text;
  33
  34 namespace System
  35 {
  36         public partial class TimeZoneInfo
  37         {
  38                 public static TimeZoneInfo FromSerializedString (string source)
  39                 {
  40                         var input = new StringBuilder (source);
  41                         var tzId = DeserializeString (ref input);
  42                         var offset = DeserializeInt (ref input);
  43                         var displayName = DeserializeString (ref input);
  44                         var standardName = DeserializeString (ref input);
  45                         var daylightName = DeserializeString (ref input);
  46                         var rules = new List<TimeZoneInfo.AdjustmentRule> ();
  47                         while (input [0] != ';') {
  48                                 rules.Add (DeserializeAdjustmentRule (ref input));
  49                         }
  50                         var offsetSpan = TimeSpan.FromMinutes (offset);
  51                         return TimeZoneInfo.CreateCustomTimeZone (tzId, offsetSpan, displayName, standardName, daylightName, rules.ToArray ());
  52                 }
  53
  54                 public string ToSerializedString ()
  55                 {
  56                         var stb = new StringBuilder ();
  57                         var daylightName = (string.IsNullOrEmpty(this.DaylightName) ? this.StandardName : this.DaylightName);
  58                         stb.AppendFormat ("{0};{1};{2};{3};{4};", EscapeForSerialization (this.Id), (int)this.BaseUtcOffset.TotalMinutes,
  59                                 EscapeForSerialization (this.DisplayName), EscapeForSerialization (this.StandardName), EscapeForSerialization (daylightName));
  60
  61                         if (this.SupportsDaylightSavingTime) {
  62                                 foreach (var rule in this.GetAdjustmentRules()) {
  63                                         var start = rule.DateStart.ToString ("MM:dd:yyyy", CultureInfo.InvariantCulture);
  64                                         var end = rule.DateEnd.ToString ("MM:dd:yyyy", CultureInfo.InvariantCulture);
  65                                         var delta = (int)rule.DaylightDelta.TotalMinutes;
  66                                         var transitionStart = SerializeTransitionTime (rule.DaylightTransitionStart);
  67                                         var transitionEnd = SerializeTransitionTime (rule.DaylightTransitionEnd);
  68                                         stb.AppendFormat ("[{0};{1};{2};{3};{4};]", start, end, delta,
  69                                                 transitionStart, transitionEnd);
  70                                 }
  71                         }
  72
  73                         stb.Append (";");
  74                         return stb.ToString ();
  75                 }
  76
  77                 private static TimeZoneInfo.AdjustmentRule DeserializeAdjustmentRule (ref StringBuilder input)
  78                 {
  79                         // Similar to: [01:01:0001;12:31:9999;60;[0;01:00:00;3;5;0;];[0;02:00:00;10;5;0;];]
  80                         if (input [0] != '[')
  81                                 throw new SerializationException ();
  82                         input.Remove (0, 1); // [
  83                         var dateStart = DeserializeDate (ref input);
  84                         var dateEnd = DeserializeDate (ref input);
  85                         var delta = DeserializeInt (ref input);
  86                         var transitionStart = DeserializeTransitionTime (ref input);
  87                         var transitionEnd = DeserializeTransitionTime (ref input);
  88                         input.Remove (0, 1); // ]
  89                         var deltaSpan = TimeSpan.FromMinutes (delta);
  90                         return TimeZoneInfo.AdjustmentRule.CreateAdjustmentRule (dateStart, dateEnd, deltaSpan,
  91                                 transitionStart, transitionEnd);
  92                 }
  93
  94                 private static TimeZoneInfo.TransitionTime DeserializeTransitionTime (ref StringBuilder input)
  95                 {
  96                         if (input [0] != '[' || (input [1] != '0' && input [1] != '1') || input [2] != ';')
  97                                 throw new SerializationException ();
  98                         var rule = input [1];
  99                         input.Remove (0, 3); // [#;
 100                         var timeOfDay = DeserializeTime (ref input);
 101                         var month = DeserializeInt (ref input);
 102                         if (rule == '0') {
 103                                 // Floating rule such as: [0;01:00:00;3;5;0;];
 104                                 var week = DeserializeInt (ref input);
 105                                 var dayOfWeek = DeserializeInt (ref input);
 106                                 input.Remove (0, 2); // ];
 107                                 return TimeZoneInfo.TransitionTime.CreateFloatingDateRule (timeOfDay, month, week, (DayOfWeek)dayOfWeek);
 108                         }
 109
 110                         // Fixed rule such as: [1;02:15:59.999;6;2;];
 111                         var day = DeserializeInt (ref input);
 112                         input.Remove (0, 2); // ];
 113                         return TimeZoneInfo.TransitionTime.CreateFixedDateRule (timeOfDay, month, day);
 114                 }
 115
 116                 private static string DeserializeString (ref StringBuilder input)
 117                 {
 118                         var stb = new StringBuilder ();
 119                         var isEscaped = false;
 120                         int charCount;
 121                         for (charCount = 0; charCount < input.Length; charCount++) {
 122                                 var inChar = input [charCount];
 123                                 if (isEscaped) {
 124                                         isEscaped = false;
 125                                         stb.Append (inChar);
 126                                 } else if (inChar == '\\') {
 127                                         isEscaped = true;
 128                                         continue;
 129                                 } else if (inChar == ';') {
 130                                         break;
 131                                 } else {
 132                                         stb.Append (inChar);
 133                                 }
 134                         }
 135                         input.Remove (0, charCount + 1);
 136                         return stb.ToString ();
 137                 }
 138
 139                 private static int DeserializeInt(ref StringBuilder input)
 140                 {
 141                         int charCount = 0;
 142                         while(charCount++ < input.Length)
 143                         {
 144                                 if (input[charCount] == ';')
 145                                         break;
 146                         }
 147                         int result;
 148                         if(!int.TryParse(input.ToString(0, charCount), NumberStyles.Integer, CultureInfo.InvariantCulture, out result))
 149                                 throw new SerializationException();
 150                         input.Remove(0, charCount + 1);
 151                         return result;
 152                 }
 153
 154                 private static DateTime DeserializeDate (ref StringBuilder input)
 155                 {
 156                         var inChars = new char[11];
 157                         input.CopyTo (0, inChars, 0, inChars.Length);
 158                         DateTime result;
 159                         if (!DateTime.TryParseExact (new string (inChars), "MM:dd:yyyy;", CultureInfo.InvariantCulture, DateTimeStyles.None, out result))
 160                                 throw new SerializationException ();
 161                         input.Remove (0, inChars.Length);
 162                         return result;
 163                 }
 164
 165                 private static DateTime DeserializeTime (ref StringBuilder input)
 166                 {
 167                         if (input [8] == ';') {
 168                                 // Without milliseconds
 169                                 var inChars = new char[9];
 170                                 input.CopyTo (0, inChars, 0, inChars.Length);
 171                                 DateTime result;
 172                                 if (!DateTime.TryParseExact (new string (inChars), "HH:mm:ss;", CultureInfo.InvariantCulture, DateTimeStyles.NoCurrentDateDefault, out result))
 173                                         throw new SerializationException ();
 174                                 input.Remove (0, inChars.Length);
 175                                 return result;
 176                         } else if (input [12] == ';') {
 177                                 // With milliseconds
 178                                 char[] inChars = new char[13];
 179                                 input.CopyTo (0, inChars, 0, inChars.Length);
 180                                 var inString = new string (inChars);
 181                                 DateTime result;
 182                                 if (!DateTime.TryParseExact (inString, "HH:mm:ss.fff;", CultureInfo.InvariantCulture, DateTimeStyles.NoCurrentDateDefault, out result))
 183                                         throw new SerializationException ();
 184                                 input.Remove (0, inChars.Length);
 185                                 return result;
 186                         }
 187                         throw new SerializationException ();
 188                 }
 189
 190                 private static string EscapeForSerialization (string unescaped)
 191                 {
 192                         return unescaped.Replace (@"\", @"\\").Replace (";", "\\;");
 193                 }
 194
 195                 private static string SerializeTransitionTime (TimeZoneInfo.TransitionTime transition)
 196                 {
 197                         string timeOfDay;
 198                         if (transition.TimeOfDay.Millisecond > 0)
 199                                 timeOfDay = transition.TimeOfDay.ToString ("HH:mm:ss.fff");
 200                         else
 201                                 timeOfDay = transition.TimeOfDay.ToString ("HH:mm:ss");
 202
 203                         if (transition.IsFixedDateRule) {
 204                                 return string.Format ("[1;{0};{1};{2};]", timeOfDay, transition.Month, transition.Day);
 205                         }
 206
 207                         return string.Format ("[0;{0};{1};{2};{3};]", timeOfDay, transition.Month,
 208                                 transition.Week, (int)transition.DayOfWeek);
 209                 }
 210         }
 211 }
 212
 213 #endif