2 // System.TimeZoneInfo helper for MonoTouch
3 // because the devices cannot access the file system to read the data
6 // Sebastien Pouliot <sebastien@xamarin.com>
8 // Copyright 2011-2013 Xamarin Inc.
10 // The class can be either constructed from a string (from user code)
11 // or from a handle (from iphone-sharp.dll internal calls). This
12 // delays the creation of the actual managed string until actually
15 // Permission is hereby granted, free of charge, to any person obtaining
16 // a copy of this software and associated documentation files (the
17 // "Software"), to deal in the Software without restriction, including
18 // without limitation the rights to use, copy, modify, merge, publish,
19 // distribute, sublicense, and/or sell copies of the Software, and to
20 // permit persons to whom the Software is furnished to do so, subject to
21 // the following conditions:
23 // The above copyright notice and this permission notice shall be
24 // included in all copies or substantial portions of the Software.
26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35 #if MONOTOUCH || XAMMAC
38 using System.Collections.Generic;
39 using System.Collections.ObjectModel;
41 using System.Runtime.InteropServices;
45 public partial class TimeZoneInfo {
47 static TimeZoneInfo CreateLocal ()
49 using (Stream stream = GetMonoTouchData (null)) {
50 return BuildFromStream ("Local", stream);
54 static TimeZoneInfo FindSystemTimeZoneByIdCore (string id)
56 using (Stream stream = GetMonoTouchData (id)) {
57 return BuildFromStream (id, stream);
61 static void GetSystemTimeZonesCore (List<TimeZoneInfo> systemTimeZones)
63 foreach (string name in GetMonoTouchNames ()) {
64 using (Stream stream = GetMonoTouchData (name, false)) {
67 systemTimeZones.Add (BuildFromStream (name, stream));
72 [DllImport ("__Internal")]
73 extern static IntPtr xamarin_timezone_get_names (ref int count);
75 static ReadOnlyCollection<string> GetMonoTouchNames ()
78 IntPtr array = xamarin_timezone_get_names (ref count);
79 string [] names = new string [count];
80 for (int i = 0, offset = 0; i < count; i++, offset += IntPtr.Size) {
81 IntPtr p = Marshal.ReadIntPtr (array, offset);
82 names [i] = Marshal.PtrToStringAnsi (p);
83 Marshal.FreeHGlobal (p);
85 Marshal.FreeHGlobal (array);
86 return new ReadOnlyCollection<string> (names);
89 [DllImport ("__Internal")]
90 extern static IntPtr xamarin_timezone_get_data (string name, ref int size);
92 static Stream GetMonoTouchData (string name, bool throw_on_error = true)
95 IntPtr data = xamarin_timezone_get_data (name, ref size);
98 throw new TimeZoneNotFoundException (name);
103 return new HGlobalUnmanagedMemoryStream ((byte*) data, size, data);