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,
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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
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38 using System.Collections.Generic;
39 using System.Collections.ObjectModel;
41 using System.Runtime.InteropServices;
45 public partial class TimeZoneInfo {
47 [DllImport ("__Internal")]
48 extern static IntPtr monotouch_timezone_get_names (ref int count);
50 static ReadOnlyCollection<string> GetMonoTouchNames ()
53 IntPtr array = monotouch_timezone_get_names (ref count);
54 string [] names = new string [count];
55 for (int i = 0, offset = 0; i < count; i++, offset += IntPtr.Size) {
56 IntPtr p = Marshal.ReadIntPtr (array, offset);
57 names [i] = Marshal.PtrToStringAnsi (p);
58 Marshal.FreeHGlobal (p);
60 Marshal.FreeHGlobal (array);
61 return new ReadOnlyCollection<string> (names);
64 [DllImport ("__Internal")]
65 extern static IntPtr monotouch_timezone_get_data (string name, ref int size);
67 static Stream GetMonoTouchData (string name, bool throw_on_error = true)
70 IntPtr data = monotouch_timezone_get_data (name, ref size);
73 throw new TimeZoneNotFoundException (name);
78 return new HGlobalUnmanagedMemoryStream ((byte*) data, size, data);