namespace System {
+ interface IAndroidTimeZoneDB {
+ IEnumerable<string> GetAvailableIds ();
+ byte[] GetTimeZoneData (string id);
+ }
+
+ [StructLayout (LayoutKind.Sequential, Pack=1)]
+ unsafe struct AndroidTzDataHeader {
+ public fixed byte signature [12];
+ public int indexOffset;
+ public int dataOffset;
+ public int zoneTabOffset;
+ }
+
+ [StructLayout (LayoutKind.Sequential, Pack=1)]
+ unsafe struct AndroidTzDataEntry {
+ public fixed byte id [40];
+ public int byteOffset;
+ public int length;
+ public int rawUtcOffset;
+ }
+
+ /*
+ * Android v4.3 Timezone support infrastructure.
+ *
+ * This is a C# port of libcore.util.ZoneInfoDB:
+ *
+ * https://android.googlesource.com/platform/libcore/+/master/luni/src/main/java/libcore/util/ZoneInfoDB.java
+ *
+ * This is needed in order to read Android v4.3 tzdata files.
+ */
+ sealed class AndroidTzData : IAndroidTimeZoneDB {
+
+ internal static readonly string[] Paths = new string[]{
+ Environment.GetEnvironmentVariable ("ANDROID_DATA") + "/misc/zoneinfo/tzdata",
+ Environment.GetEnvironmentVariable ("ANDROID_ROOT") + "/usr/share/zoneinfo/tzdata",
+ };
+
+ string tzdataPath;
+ Stream data;
+ string version;
+ string zoneTab;
+
+ string[] ids;
+ int[] byteOffsets;
+ int[] lengths;
+
+ public AndroidTzData (params string[] paths)
+ {
+ foreach (var path in paths)
+ if (LoadData (path)) {
+ tzdataPath = path;
+ return;
+ }
+
+ Console.Error.WriteLine ("Couldn't find any tzdata!");
+ tzdataPath = "/";
+ version = "missing";
+ zoneTab = "# Emergency fallback data.\n";
+ ids = new[]{ "GMT" };
+ }
+
+ public string Version {
+ get {return version;}
+ }
+
+ public string ZoneTab {
+ get {return zoneTab;}
+ }
+
+ bool LoadData (string path)
+ {
+ if (!File.Exists (path))
+ return false;
+ try {
+ data = File.OpenRead (path);
+ } catch (IOException) {
+ return false;
+ } catch (UnauthorizedAccessException) {
+ return false;
+ }
+
+ try {
+ ReadHeader ();
+ return true;
+ } catch (Exception e) {
+ Console.Error.WriteLine ("tzdata file \"{0}\" was present but invalid: {1}", path, e);
+ }
+ return false;
+ }
+
+ unsafe void ReadHeader ()
+ {
+ int size = System.Math.Max (Marshal.SizeOf (typeof (AndroidTzDataHeader)), Marshal.SizeOf (typeof (AndroidTzDataEntry)));
+ var buffer = new byte [size];
+ var header = ReadAt<AndroidTzDataHeader>(0, buffer);
+
+ header.indexOffset = NetworkToHostOrder (header.indexOffset);
+ header.dataOffset = NetworkToHostOrder (header.dataOffset);
+ header.zoneTabOffset = NetworkToHostOrder (header.zoneTabOffset);
+
+ sbyte* s = (sbyte*) header.signature;
+ string magic = new string (s, 0, 6, Encoding.ASCII);
+ if (magic != "tzdata" || header.signature [11] != 0) {
+ var b = new StringBuilder ();
+ b.Append ("bad tzdata magic:");
+ for (int i = 0; i < 12; ++i) {
+ b.Append (" ").Append (((byte) s [i]).ToString ("x2"));
+ }
+ throw new InvalidOperationException ("bad tzdata magic: " + b.ToString ());
+ }
+
+ version = new string (s, 6, 5, Encoding.ASCII);
+
+ ReadIndex (header.indexOffset, header.dataOffset, buffer);
+ ReadZoneTab (header.zoneTabOffset, checked ((int) data.Length) - header.zoneTabOffset);
+ }
+
+ unsafe T ReadAt<T> (long position, byte[] buffer)
+ where T : struct
+ {
+ int size = Marshal.SizeOf (typeof (T));
+ if (buffer.Length < size)
+ throw new InvalidOperationException ("Internal error: buffer too small");
+
+ data.Position = position;
+ int r;
+ if ((r = data.Read (buffer, 0, size)) < size)
+ throw new InvalidOperationException (
+ string.Format ("Error reading '{0}': read {1} bytes, expected {2}", tzdataPath, r, size));
+
+ fixed (byte* b = buffer)
+ return (T) Marshal.PtrToStructure ((IntPtr) b, typeof (T));
+ }
+
+ static int NetworkToHostOrder (int value)
+ {
+ if (!BitConverter.IsLittleEndian)
+ return value;
+
+ return
+ (((value >> 24) & 0xFF) |
+ ((value >> 08) & 0xFF00) |
+ ((value << 08) & 0xFF0000) |
+ ((value << 24)));
+ }
+
+ unsafe void ReadIndex (int indexOffset, int dataOffset, byte[] buffer)
+ {
+ int indexSize = dataOffset - indexOffset;
+ int entryCount = indexSize / Marshal.SizeOf (typeof (AndroidTzDataEntry));
+ int entrySize = Marshal.SizeOf (typeof (AndroidTzDataEntry));
+
+ byteOffsets = new int [entryCount];
+ ids = new string [entryCount];
+ lengths = new int [entryCount];
+
+ for (int i = 0; i < entryCount; ++i) {
+ var entry = ReadAt<AndroidTzDataEntry>(indexOffset + (entrySize*i), buffer);
+ var p = (sbyte*) entry.id;
+
+ byteOffsets [i] = NetworkToHostOrder (entry.byteOffset) + dataOffset;
+ ids [i] = new string (p, 0, GetStringLength (p, 40), Encoding.ASCII);
+ lengths [i] = NetworkToHostOrder (entry.length);
+
+ if (lengths [i] < Marshal.SizeOf (typeof (AndroidTzDataHeader)))
+ throw new InvalidOperationException ("Length in index file < sizeof(tzhead)");
+ }
+ }
+
+ static unsafe int GetStringLength (sbyte* s, int maxLength)
+ {
+ int len;
+ for (len = 0; len < maxLength; len++, s++) {
+ if (*s == 0)
+ break;
+ }
+ return len;
+ }
+
+ unsafe void ReadZoneTab (int zoneTabOffset, int zoneTabSize)
+ {
+ byte[] zoneTab = new byte [zoneTabSize];
+
+ data.Position = zoneTabOffset;
+
+ int r;
+ if ((r = data.Read (zoneTab, 0, zoneTab.Length)) < zoneTab.Length)
+ throw new InvalidOperationException (
+ string.Format ("Error reading zonetab: read {0} bytes, expected {1}", r, zoneTabSize));
+
+ this.zoneTab = Encoding.ASCII.GetString (zoneTab, 0, zoneTab.Length);
+ }
+
+ public IEnumerable<string> GetAvailableIds ()
+ {
+ return ids;
+ }
+
+ public byte[] GetTimeZoneData (string id)
+ {
+ int i = Array.BinarySearch (ids, id, StringComparer.Ordinal);
+ if (i < 0)
+ return null;
+
+ int offset = byteOffsets [i];
+ int length = lengths [i];
+ var buffer = new byte [length];
+
+ lock (data) {
+ data.Position = offset;
+ int r;
+ if ((r = data.Read (buffer, 0, buffer.Length)) < buffer.Length)
+ throw new InvalidOperationException (
+ string.Format ("Unable to fully read from file '{0}' at offset {1} length {2}; read {3} bytes expected {4}.",
+ tzdataPath, offset, length, r, buffer.Length));
+ }
+
+ return buffer;
+ }
+ }
+
partial class TimeZoneInfo {
/*
- * Android Timezone support infrastructure.
+ * Android < v4.3 Timezone support infrastructure.
*
* This is a C# port of org.apache.harmony.luni.internal.util.ZoneInfoDB:
*
* which succinctly describes why we can't just use the LIBC implementation in
* TimeZoneInfo.cs -- the "standard Unixy" directory structure is NOT used.
*/
- static class ZoneInfoDB {
+ sealed class ZoneInfoDB : IAndroidTimeZoneDB {
const int TimeZoneNameLength = 40;
const int TimeZoneIntSize = 4;
- static readonly string ZoneDirectoryName = Environment.GetEnvironmentVariable ("ANDROID_ROOT") + "/usr/share/zoneinfo/";
- static readonly string ZoneFileName = ZoneDirectoryName + "zoneinfo.dat";
- static readonly string IndexFileName = ZoneDirectoryName + "zoneinfo.idx";
- const string DefaultVersion = "2007h";
- static readonly string VersionFileName = ZoneDirectoryName + "zoneinfo.version";
+ internal static readonly string ZoneDirectoryName = Environment.GetEnvironmentVariable ("ANDROID_ROOT") + "/usr/share/zoneinfo/";
- static readonly object _lock = new object ();
+ const string ZoneFileName = "zoneinfo.dat";
+ const string IndexFileName = "zoneinfo.idx";
+ const string DefaultVersion = "2007h";
+ const string VersionFileName = "zoneinfo.version";
- static readonly string version;
- static readonly string[] names;
- static readonly int[] starts;
- static readonly int[] lengths;
- static readonly int[] offsets;
+ readonly string zoneRoot;
+ readonly string version;
+ readonly string[] names;
+ readonly int[] starts;
+ readonly int[] lengths;
+ readonly int[] offsets;
- static ZoneInfoDB ()
+ public ZoneInfoDB (string zoneInfoDB = null)
{
+ zoneRoot = zoneInfoDB ?? ZoneDirectoryName;
try {
- version = ReadVersion ();
+ version = ReadVersion (Path.Combine (zoneRoot, VersionFileName));
} catch {
version = DefaultVersion;
}
try {
- ReadDatabase (out names, out starts, out lengths, out offsets);
+ ReadDatabase (Path.Combine (zoneRoot, IndexFileName), out names, out starts, out lengths, out offsets);
} catch {
names = new string [0];
starts = new int [0];
}
}
- static string ReadVersion ()
+ static string ReadVersion (string path)
{
- using (var file = new StreamReader (VersionFileName, Encoding.GetEncoding ("iso-8859-1"))) {
+ using (var file = new StreamReader (path, Encoding.GetEncoding ("iso-8859-1"))) {
return file.ReadToEnd ().Trim ();
}
}
- static void ReadDatabase (out string[] names, out int[] starts, out int[] lengths, out int[] offsets)
+ void ReadDatabase (string path, out string[] names, out int[] starts, out int[] lengths, out int[] offsets)
{
- using (var file = File.OpenRead (IndexFileName)) {
+ using (var file = File.OpenRead (path)) {
var nbuf = new byte [TimeZoneNameLength];
int numEntries = (int) (file.Length / (TimeZoneNameLength + 3*TimeZoneIntSize));
static void Fill (Stream stream, byte[] nbuf, int required)
{
- int read, offset = 0;
+ int read = 0, offset = 0;
while (offset < required && (read = stream.Read (nbuf, offset, required - offset)) > 0)
offset += read;
if (read != required)
((nbuf [2] & 0xff) << 8) + (nbuf [3] & 0xff);
}
- internal static string Version {
+ internal string Version {
get {return version;}
}
- internal static IEnumerable<string> GetAvailableIds ()
+ public IEnumerable<string> GetAvailableIds ()
{
return GetAvailableIds (0, false);
}
- internal static IEnumerable<string> GetAvailableIds (int rawOffset)
+ IEnumerable<string> GetAvailableIds (int rawOffset)
{
return GetAvailableIds (rawOffset, true);
}
- static IEnumerable<string> GetAvailableIds (int rawOffset, bool checkOffset)
+ IEnumerable<string> GetAvailableIds (int rawOffset, bool checkOffset)
{
for (int i = 0; i < offsets.Length; ++i) {
if (!checkOffset || offsets [i] == rawOffset)
}
}
- static TimeZoneInfo _GetTimeZone (string name)
+ public byte[] GetTimeZoneData (string id)
{
int start, length;
- using (var stream = GetTimeZoneData (name, out start, out length)) {
+ using (var stream = GetTimeZoneData (id, out start, out length)) {
if (stream == null)
return null;
byte[] buf = new byte [length];
Fill (stream, buf, buf.Length);
- return TimeZoneInfo.ParseTZBuffer (name, buf, length);
+ return buf;
}
}
- static FileStream GetTimeZoneData (string name, out int start, out int length)
+ FileStream GetTimeZoneData (string name, out int start, out int length)
{
- var f = new FileInfo (Path.Combine (ZoneDirectoryName, name));
+ var f = new FileInfo (Path.Combine (zoneRoot, name));
if (f.Exists) {
start = 0;
length = (int) f.Length;
start = length = 0;
- int i = Array.BinarySearch (names, name);
+ int i = Array.BinarySearch (names, name, StringComparer.Ordinal);
if (i < 0)
return null;
start = starts [i];
length = lengths [i];
- var stream = File.OpenRead (ZoneFileName);
+ var stream = File.OpenRead (Path.Combine (zoneRoot, ZoneFileName));
stream.Seek (start, SeekOrigin.Begin);
return stream;
}
+ }
+
+ static class AndroidTimeZones {
+
+ static IAndroidTimeZoneDB db;
+
+ static AndroidTimeZones ()
+ {
+ db = GetDefaultTimeZoneDB ();
+ }
+
+ static IAndroidTimeZoneDB GetDefaultTimeZoneDB ()
+ {
+ foreach (var p in AndroidTzData.Paths)
+ if (File.Exists (p))
+ return new AndroidTzData (AndroidTzData.Paths);
+ if (Directory.Exists (ZoneInfoDB.ZoneDirectoryName))
+ return new ZoneInfoDB ();
+ return null;
+ }
+
+ internal static IEnumerable<string> GetAvailableIds ()
+ {
+ return db == null
+ ? new string [0]
+ : db.GetAvailableIds ();
+ }
+
+ static TimeZoneInfo _GetTimeZone (string name)
+ {
+ if (db == null)
+ return null;
+ byte[] buffer = db.GetTimeZoneData (name);
+ if (buffer == null)
+ return null;
+ return TimeZoneInfo.ParseTZBuffer (name, buffer, buffer.Length);
+ }
internal static TimeZoneInfo GetTimeZone (string id)
{
try {
return _GetTimeZone (id);
- } catch (Exception e) {
+ } catch (Exception) {
return null;
}
}
return sign * (hour * 60) * 60;
}
+ static readonly object _lock = new object ();
+
static TimeZoneInfo defaultZone;
internal static TimeZoneInfo Default {
get {
return buf.ToString ();
return null;
}
+
+#if SELF_TEST
+ /*
+ * Compile:
+ * mcs /out:tzi.exe /unsafe "/d:INSIDE_CORLIB;MONODROID;NET_4_0;LIBC;SELF_TEST" System/TimeZone*.cs ../../build/common/Consts.cs ../Mono.Options/Mono.Options/Options.cs
+ * Prep:
+ * mkdir -p usr/share/zoneinfo
+ * android_root=`adb shell echo '$ANDROID_ROOT' | tr -d "\r"`
+ * adb pull $android_root/usr/share/zoneinfo usr/share/zoneinfo
+ * Run:
+ * ANDROID_ROOT=`pwd` mono tzi.exe
+ */
+ static void Main (string[] args)
+ {
+ Func<IAndroidTimeZoneDB> c = () => GetDefaultTimeZoneDB ();
+ Mono.Options.OptionSet p = null;
+ p = new Mono.Options.OptionSet () {
+ { "T=", "Create AndroidTzData from {PATH}.", v => {
+ c = () => new AndroidTzData (v);
+ } },
+ { "Z=", "Create ZoneInfoDB from {DIR}.", v => {
+ c = () => new ZoneInfoDB (v);
+ } },
+ { "help", "Show this message and exit", v => {
+ p.WriteOptionDescriptions (Console.Out);
+ Environment.Exit (0);
+ } },
+ };
+ p.Parse (args);
+ AndroidTimeZones.db = c ();
+ Console.WriteLine ("DB type: {0}", AndroidTimeZones.db.GetType ().FullName);
+ foreach (var id in GetAvailableIds ()) {
+ Console.Write ("name={0,-40}", id);
+ try {
+ TimeZoneInfo zone = _GetTimeZone (id);
+ if (zone != null)
+ Console.Write (" {0}", zone);
+ else {
+ Console.Write (" ERROR:null");
+ }
+ } catch (Exception e) {
+ Console.WriteLine ();
+ Console.Write ("ERROR: {0}", e);
+ }
+ Console.WriteLine ();
+ }
+ }
+#endif
}
}
}
projects / mono.git / blobdiff