From 7f54c0f49224a25aa232eadf5b18656a8c53fc26 Mon Sep 17 00:00:00 2001
From: Natalia Portillo <claunia@claunia.com>
Date: Thu, 15 Sep 2016 01:54:13 +0100
Subject: [PATCH] 	* DiscImageChef.Helpers/StringHandlers.cs: 	  Adds
 support for OSTA Compressed Unicode.

	* DiscImageChef.Helpers/DateHandlers.cs:
	  Adds support for timestamps in ECMA-167 format.
---
 DiscImageChef.Filesystems/UDF.cs        | 42 +++++++++++++++++++++++++
 DiscImageChef.Helpers/DateHandlers.cs   | 26 +++++++++++++++
 DiscImageChef.Helpers/StringHandlers.cs | 34 ++++++++++++++++++++
 3 files changed, 102 insertions(+)
 create mode 100644 DiscImageChef.Filesystems/UDF.cs

diff --git a/DiscImageChef.Filesystems/UDF.cs b/DiscImageChef.Filesystems/UDF.cs
new file mode 100644
index 000000000..a2860df82
--- /dev/null
+++ b/DiscImageChef.Filesystems/UDF.cs
@@ -0,0 +1,42 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : UDF.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Component
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Description
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This library is free software; you can redistribute it and/or modify
+//     it under the terms of the GNU Lesser General Public License as
+//     published by the Free Software Foundation; either version 2.1 of the
+//     License, or (at your option) any later version.
+//
+//     This library is distributed in the hope that it will be useful, but
+//     WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+//     Lesser General Public License for more details.
+//
+//     You should have received a copy of the GNU Lesser General Public
+//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2011-2016 Natalia Portillo
+// ****************************************************************************/
+using System;
+namespace DiscImageChef.Filesystems
+{
+    public class UDF
+    {
+        public UDF()
+        {
+        }
+    }
+}
+
diff --git a/DiscImageChef.Helpers/DateHandlers.cs b/DiscImageChef.Helpers/DateHandlers.cs
index e634e713d..2a0e5fd5b 100644
--- a/DiscImageChef.Helpers/DateHandlers.cs
+++ b/DiscImageChef.Helpers/DateHandlers.cs
@@ -198,6 +198,32 @@ namespace DiscImageChef
         {
             return AppleDoubleEpoch.AddSeconds(AppleDoubleTimeStamp);
         }
+
+        public static DateTime ECMAToDateTime(ushort typeAndTimeZone, short year, byte month, byte day, byte hour, byte minute, byte second, byte centiseconds, byte hundredsOfMicroseconds, byte microseconds)
+        {
+            byte specification = (byte)((typeAndTimeZone & 0xF000) >> 12);
+            long ticks = (long)centiseconds * 100000 + (long)hundredsOfMicroseconds * 1000 + (long)microseconds * 10;
+            if(specification == 0)
+                return new DateTime(year, month, day, hour, minute, second, DateTimeKind.Utc).AddTicks(ticks);
+
+            ushort preOffset = (ushort)(typeAndTimeZone & 0xFFF);
+            short offset;
+
+            if((preOffset & 0x800) == 0x800)
+            {
+                offset = (short)(preOffset | 0xF000);
+            }
+            else
+                offset = (short)(preOffset & 0x7FF);
+
+            if(offset == -2047)
+                return new DateTime(year, month, day, hour, minute, second, DateTimeKind.Unspecified).AddTicks(ticks);
+            
+            if(offset < -1440 || offset > 1440)
+                offset = 0;
+
+            return new DateTimeOffset(year, month, day, hour, minute, second, new TimeSpan(0, offset, 0)).AddTicks(ticks).DateTime;
+        }
     }
 }
 
diff --git a/DiscImageChef.Helpers/StringHandlers.cs b/DiscImageChef.Helpers/StringHandlers.cs
index 2e43fb5bb..a17a2acbe 100644
--- a/DiscImageChef.Helpers/StringHandlers.cs
+++ b/DiscImageChef.Helpers/StringHandlers.cs
@@ -118,6 +118,40 @@ namespace DiscImageChef
 
             return length == 0 ? "" : Encoding.ASCII.GetString(SpacePaddedString, 0, length);
         }
+
+        /// <summary>
+        /// Converts an OSTA compressed unicode byte array to a C# string
+        /// </summary>
+        /// <returns>The C# string.</returns>
+        /// <param name="dstring">OSTA compressed unicode byte array.</param>
+        public static string DecompressUnicode(byte[] dstring)
+        {
+            ushort unicode;
+            byte compId = dstring[0];
+            string temp = "";
+
+            if(compId != 8 && compId != 16)
+                return null;
+
+            for(int byteIndex = 1; byteIndex < dstring.Length;)
+            {
+                if(compId == 16)
+                    unicode = (ushort)(dstring[byteIndex++] << 8);
+                else
+                    unicode = 0;
+
+                if(byteIndex < dstring.Length)
+                    unicode |= dstring[byteIndex++];
+
+                if(unicode == 0)
+                    break;
+
+                temp += Encoding.Unicode.GetString(System.BitConverter.GetBytes(unicode));
+            }
+
+            return temp;
+        }
+
     }
 }