113 lines
3.5 KiB
C#
113 lines
3.5 KiB
C#
//
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// System.TimeZoneInfo helper for MonoTouch
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// because the devices cannot access the file system to read the data
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//
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// Authors:
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// Sebastien Pouliot <sebastien@xamarin.com>
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//
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// Copyright 2011-2013 Xamarin Inc.
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//
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// The class can be either constructed from a string (from user code)
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// or from a handle (from iphone-sharp.dll internal calls). This
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// delays the creation of the actual managed string until actually
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// required
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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#if MONOTOUCH || XAMMAC
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.IO;
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using System.Runtime.InteropServices;
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namespace System {
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public partial class TimeZoneInfo {
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[DllImport ("__Internal")]
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extern static string xamarin_timezone_get_local_name ();
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static TimeZoneInfo CreateLocal ()
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{
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using (Stream stream = GetMonoTouchData (null)) {
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return BuildFromStream (xamarin_timezone_get_local_name (), stream);
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}
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}
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static TimeZoneInfo FindSystemTimeZoneByIdCore (string id)
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{
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using (Stream stream = GetMonoTouchData (id)) {
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return BuildFromStream (id, stream);
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}
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}
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static void GetSystemTimeZonesCore (List<TimeZoneInfo> systemTimeZones)
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{
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foreach (string name in GetMonoTouchNames ()) {
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using (Stream stream = GetMonoTouchData (name, false)) {
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if (stream == null)
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continue;
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systemTimeZones.Add (BuildFromStream (name, stream));
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}
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}
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}
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[DllImport ("__Internal")]
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extern static IntPtr xamarin_timezone_get_names (ref int count);
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static ReadOnlyCollection<string> GetMonoTouchNames ()
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{
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int count = 0;
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IntPtr array = xamarin_timezone_get_names (ref count);
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string [] names = new string [count];
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for (int i = 0, offset = 0; i < count; i++, offset += IntPtr.Size) {
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IntPtr p = Marshal.ReadIntPtr (array, offset);
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names [i] = Marshal.PtrToStringAnsi (p);
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Marshal.FreeHGlobal (p);
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}
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Marshal.FreeHGlobal (array);
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return new ReadOnlyCollection<string> (names);
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}
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[DllImport ("__Internal")]
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extern static IntPtr xamarin_timezone_get_data (string name, ref int size);
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static Stream GetMonoTouchData (string name, bool throw_on_error = true)
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{
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int size = 0;
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IntPtr data = xamarin_timezone_get_data (name, ref size);
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if (size <= 0) {
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if (throw_on_error)
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throw new TimeZoneNotFoundException (name);
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return null;
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}
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unsafe {
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return new HGlobalUnmanagedMemoryStream ((byte*) data, size, data);
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}
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}
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}
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}
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#endif
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