[monodroid] Add support for the Android TimeZone file format.
[mono.git] / mcs / class / System.Core / System / TimeZoneInfo.cs
index 2726dd7816871124ed9468e371b67fdeb38ba253..cb464b54ad9cf17060cb97c7c1978c54a4b4bab6 100644 (file)
  */
 
 using System;
+using System.Runtime.CompilerServices;
+
+#if !INSIDE_CORLIB && (NET_4_0 || BOOTSTRAP_NET_4_0 || MOONLIGHT)
+
+[assembly:TypeForwardedTo (typeof(TimeZoneInfo))]
+
+#elif NET_3_5 || (MOBILE && !INSIDE_CORLIB) || (MOONLIGHT && INSIDE_CORLIB)
+
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Linq;
 using System.Runtime.Serialization;
 using System.Text;
 
-#if LIBC
+#if LIBC || MONODROID
 using System.IO;
 using Mono;
 #endif
 
+using Microsoft.Win32;
+
 namespace System
 {
+#if NET_4_0 || BOOTSTRAP_NET_4_0
+       [TypeForwardedFrom (Consts.AssemblySystemCore_3_5)]
+#elif MOONLIGHT
+       [TypeForwardedFrom (Consts.AssemblySystem_Core)]
+#endif
        [SerializableAttribute]
        public sealed partial class TimeZoneInfo : IEquatable<TimeZoneInfo>, ISerializable, IDeserializationCallback
        {
@@ -68,7 +84,9 @@ namespace System
                public static TimeZoneInfo Local {
                        get { 
                                if (local == null) {
-#if LIBC
+#if MONODROID
+                                       local = ZoneInfoDB.Default;
+#elif LIBC
                                        try {
                                                local = FindSystemTimeZoneByFileName ("Local", "/etc/localtime");       
                                        } catch {
@@ -106,7 +124,7 @@ namespace System
                }
 #if LIBC
                static string timeZoneDirectory = null;
-               public static string TimeZoneDirectory {
+               static string TimeZoneDirectory {
                        get {
                                if (timeZoneDirectory == null)
                                        timeZoneDirectory = "/usr/share/zoneinfo";
@@ -120,6 +138,25 @@ namespace System
 #endif
                private AdjustmentRule [] adjustmentRules;
 
+#if !NET_2_1
+               static RegistryKey timeZoneKey = null;
+               static bool timeZoneKeySet = false;
+               static RegistryKey TimeZoneKey {
+                       get {
+                               if (!timeZoneKeySet) {
+                                       int p = (int) Environment.OSVersion.Platform;
+                                       /* Only use the registry on non-Unix platforms. */
+                                       if ((p != 4) && (p != 6) && (p != 128))
+                                               timeZoneKey = Registry.LocalMachine.OpenSubKey (
+                                                       "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones",
+                                                       false);
+                                       timeZoneKeySet = true;
+                               }
+                               return timeZoneKey;
+                       }
+               }
+#endif
+
                public static void ClearCachedData ()
                {
                        local = null;
@@ -277,7 +314,18 @@ namespace System
                        //FIXME: this method should check for cached values in systemTimeZones
                        if (id == null)
                                throw new ArgumentNullException ("id");
-#if LIBC       
+#if !NET_2_1
+                       if (TimeZoneKey != null)
+                       {
+                               RegistryKey key = TimeZoneKey.OpenSubKey (id, false);
+                               if (key == null)
+                                       throw new TimeZoneNotFoundException ();
+                               return FromRegistryKey(id, key);
+                       }
+#endif
+#if MONODROID
+                       return ZoneInfoDB.GetTimeZone (id);
+#elif LIBC
                        string filepath = Path.Combine (TimeZoneDirectory, id);
                        return FindSystemTimeZoneByFileName (id, filepath);
 #else
@@ -309,6 +357,112 @@ namespace System
                }
 #endif
 
+#if !NET_2_1
+               private static TimeZoneInfo FromRegistryKey (string id, RegistryKey key)
+               {
+                       byte [] reg_tzi = (byte []) key.GetValue ("TZI");
+
+                       if (reg_tzi == null)
+                               throw new InvalidTimeZoneException ();
+
+                       int bias = BitConverter.ToInt32 (reg_tzi, 0);
+                       TimeSpan baseUtcOffset = new TimeSpan (0, -bias, 0);
+
+                       string display_name = (string) key.GetValue ("Display");
+                       string standard_name = (string) key.GetValue ("Std");
+                       string daylight_name = (string) key.GetValue ("Dlt");
+
+                       List<AdjustmentRule> adjustmentRules = new List<AdjustmentRule> ();
+
+                       RegistryKey dst_key = key.OpenSubKey ("Dynamic DST", false);
+                       if (dst_key != null) {
+                               int first_year = (int) dst_key.GetValue ("FirstEntry");
+                               int last_year = (int) dst_key.GetValue ("LastEntry");
+                               int year;
+
+                               for (year=first_year; year<=last_year; year++) {
+                                       byte [] dst_tzi = (byte []) dst_key.GetValue (year.ToString ());
+                                       if (dst_tzi != null) {
+                                               int start_year = year == first_year ? 1 : year;
+                                               int end_year = year == last_year ? 9999 : year;
+                                               ParseRegTzi(adjustmentRules, start_year, end_year, dst_tzi);
+                                       }
+                               }
+                       }
+                       else
+                               ParseRegTzi(adjustmentRules, 1, 9999, reg_tzi);
+
+                       return CreateCustomTimeZone (id, baseUtcOffset, display_name, standard_name, daylight_name, ValidateRules (adjustmentRules).ToArray ());
+               }
+
+               private static void ParseRegTzi (List<AdjustmentRule> adjustmentRules, int start_year, int end_year, byte [] buffer)
+               {
+                       //int standard_bias = BitConverter.ToInt32 (buffer, 4); /* not sure how to handle this */
+                       int daylight_bias = BitConverter.ToInt32 (buffer, 8);
+
+                       int standard_year = BitConverter.ToInt16 (buffer, 12);
+                       int standard_month = BitConverter.ToInt16 (buffer, 14);
+                       int standard_dayofweek = BitConverter.ToInt16 (buffer, 16);
+                       int standard_day = BitConverter.ToInt16 (buffer, 18);
+                       int standard_hour = BitConverter.ToInt16 (buffer, 20);
+                       int standard_minute = BitConverter.ToInt16 (buffer, 22);
+                       int standard_second = BitConverter.ToInt16 (buffer, 24);
+                       int standard_millisecond = BitConverter.ToInt16 (buffer, 26);
+
+                       int daylight_year = BitConverter.ToInt16 (buffer, 28);
+                       int daylight_month = BitConverter.ToInt16 (buffer, 30);
+                       int daylight_dayofweek = BitConverter.ToInt16 (buffer, 32);
+                       int daylight_day = BitConverter.ToInt16 (buffer, 34);
+                       int daylight_hour = BitConverter.ToInt16 (buffer, 36);
+                       int daylight_minute = BitConverter.ToInt16 (buffer, 38);
+                       int daylight_second = BitConverter.ToInt16 (buffer, 40);
+                       int daylight_millisecond = BitConverter.ToInt16 (buffer, 42);
+
+                       if (standard_month == 0 || daylight_month == 0)
+                               return;
+
+                       DateTime start_date;
+                       DateTime start_timeofday = new DateTime (1, 1, 1, daylight_hour, daylight_minute, daylight_second, daylight_millisecond);
+                       TransitionTime start_transition_time;
+
+                       if (daylight_year == 0) {
+                               start_date = new DateTime (start_year, 1, 1);
+                               start_transition_time = TransitionTime.CreateFloatingDateRule (
+                                       start_timeofday, daylight_month, daylight_day,
+                                       (DayOfWeek) daylight_dayofweek);
+                       }
+                       else {
+                               start_date = new DateTime (daylight_year, daylight_month, daylight_day,
+                                       daylight_hour, daylight_minute, daylight_second, daylight_millisecond);
+                               start_transition_time = TransitionTime.CreateFixedDateRule (
+                                       start_timeofday, daylight_month, daylight_day);
+                       }
+
+                       DateTime end_date;
+                       DateTime end_timeofday = new DateTime (1, 1, 1, standard_hour, standard_minute, standard_second, standard_millisecond);
+                       TransitionTime end_transition_time;
+
+                       if (standard_year == 0) {
+                               end_date = new DateTime (end_year, 12, 31);
+                               end_transition_time = TransitionTime.CreateFloatingDateRule (
+                                       end_timeofday, standard_month, standard_day,
+                                       (DayOfWeek) standard_dayofweek);
+                       }
+                       else {
+                               end_date = new DateTime (standard_year, standard_month, standard_day,
+                                       standard_hour, standard_minute, standard_second, standard_millisecond);
+                               end_transition_time = TransitionTime.CreateFixedDateRule (
+                                       end_timeofday, standard_month, standard_day);
+                       }
+
+                       TimeSpan daylight_delta = new TimeSpan(0, -daylight_bias, 0);
+
+                       adjustmentRules.Add (AdjustmentRule.CreateAdjustmentRule (
+                               start_date, end_date, daylight_delta,
+                               start_transition_time, end_transition_time));
+               }
+#endif
+
                public static TimeZoneInfo FromSerializedString (string source)
                {
                        throw new NotImplementedException ();
@@ -347,7 +501,11 @@ namespace System
                        return hash_code;
                }
 
+#if NET_4_0
+               void ISerializable.GetObjectData (SerializationInfo info, StreamingContext context)
+#else
                public void GetObjectData (SerializationInfo info, StreamingContext context)
+#endif
                {
                        throw new NotImplementedException ();
                }
@@ -358,7 +516,21 @@ namespace System
                {
                        if (systemTimeZones == null) {
                                systemTimeZones = new List<TimeZoneInfo> ();
-#if LIBC
+#if !NET_2_1
+                               if (TimeZoneKey != null) {
+                                       foreach (string id in TimeZoneKey.GetSubKeyNames ()) {
+                                               try {
+                                                       systemTimeZones.Add (FindSystemTimeZoneById (id));
+                                               } catch {}
+                                       }
+
+                                       return new ReadOnlyCollection<TimeZoneInfo> (systemTimeZones);
+                               }
+#endif
+#if MONODROID
+                       systemTimeZones.AddRange (ZoneInfoDB.GetAvailableIds ()
+                                       .Select (id => ZoneInfoDB.GetTimeZone (id)));
+#elif LIBC
                                string[] continents = new string [] {"Africa", "America", "Antarctica", "Arctic", "Asia", "Atlantic", "Brazil", "Canada", "Chile", "Europe", "Indian", "Mexico", "Mideast", "Pacific", "US"};
                                foreach (string continent in continents) {
                                        try {
@@ -501,7 +673,11 @@ namespace System
                        return false;
                }
 
+#if NET_4_0
+               void IDeserializationCallback.OnDeserialization (object sender)
+#else
                public void OnDeserialization (object sender)
+#endif
                {
                        throw new NotImplementedException ();
                }
@@ -578,12 +754,14 @@ namespace System
                        if (dateTime.Kind == DateTimeKind.Utc && this != TimeZoneInfo.Utc)
                                date = date + BaseUtcOffset;
 
-                       foreach (AdjustmentRule rule in adjustmentRules) {
-                               if (rule.DateStart > date.Date)
-                                       return null;
-                               if (rule.DateEnd < date.Date)
-                                       continue;
-                               return rule;
+                       if (adjustmentRules != null) {
+                               foreach (AdjustmentRule rule in adjustmentRules) {
+                                       if (rule.DateStart > date.Date)
+                                               return null;
+                                       if (rule.DateEnd < date.Date)
+                                               continue;
+                                       return rule;
+                               }
                        }
                        return null;
                }
@@ -600,7 +778,19 @@ namespace System
                        return new DateTime (year, transition.Month, day) + transition.TimeOfDay.TimeOfDay;
                }
 
-#if LIBC
+               static List<AdjustmentRule> ValidateRules (List<AdjustmentRule> adjustmentRules)
+               {
+                       AdjustmentRule prev = null;
+                       foreach (AdjustmentRule current in adjustmentRules.ToArray ()) {
+                               if (prev != null && prev.DateEnd > current.DateStart) {
+                                       adjustmentRules.Remove (current);
+                               }
+                               prev = current;
+                       }
+                       return adjustmentRules;
+               }
+
+#if LIBC || MONODROID
                private static bool ValidTZFile (byte [] buffer, int length)
                {
                        StringBuilder magic = new StringBuilder ();
@@ -746,18 +936,6 @@ namespace System
                        }
                }
 
-               static List<AdjustmentRule> ValidateRules (List<AdjustmentRule> adjustmentRules)
-               {
-                       AdjustmentRule prev = null;
-                       foreach (AdjustmentRule current in adjustmentRules.ToArray ()) {
-                               if (prev != null && prev.DateEnd > current.DateStart) {
-                                       adjustmentRules.Remove (current);
-                               }
-                               prev = current;
-                       }
-                       return adjustmentRules;
-               }
-
                static Dictionary<int, string> ParseAbbreviations (byte [] buffer, int index, int count)
                {
                        var abbrevs = new Dictionary<int, string> ();
@@ -811,3 +989,5 @@ namespace System
 #endif
        }
 }
+
+#endif