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Diffstat (limited to 'LibWinUsb/Internal/SafeOverlapped.cs')
| -rw-r--r-- | LibWinUsb/Internal/SafeOverlapped.cs | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/LibWinUsb/Internal/SafeOverlapped.cs b/LibWinUsb/Internal/SafeOverlapped.cs new file mode 100644 index 0000000..dae0f4e --- /dev/null +++ b/LibWinUsb/Internal/SafeOverlapped.cs @@ -0,0 +1,115 @@ +// Copyright © 2006-2010 Travis Robinson. All rights reserved.
+//
+// website: http://sourceforge.net/projects/libusbdotnet
+// e-mail: libusbdotnet@gmail.com
+//
+// This program is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program 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 General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. or
+// visit www.gnu.org.
+//
+//
+using System;
+using System.Runtime.InteropServices;
+using System.Threading;
+
+namespace LibUsbDotNet.Internal
+{
+ internal class SafeOverlapped : IDisposable
+ {
+ // Find the structural starting positions in the NativeOverlapped structure.
+ private static readonly int FieldOffsetEventHandle = Marshal.OffsetOf(typeof (NativeOverlapped), "EventHandle").ToInt32();
+ private static readonly int FieldOffsetInternalHigh = Marshal.OffsetOf(typeof (NativeOverlapped), "InternalHigh").ToInt32();
+ private static readonly int FieldOffsetInternalLow = Marshal.OffsetOf(typeof (NativeOverlapped), "InternalLow").ToInt32();
+ private static readonly int FieldOffsetOffsetHigh = Marshal.OffsetOf(typeof (NativeOverlapped), "OffsetHigh").ToInt32();
+ private static readonly int FieldOffsetOffsetLow = Marshal.OffsetOf(typeof (NativeOverlapped), "OffsetLow").ToInt32();
+ private IntPtr mPtrOverlapped = IntPtr.Zero;
+
+ public SafeOverlapped()
+ {
+ // Globally allocated the memory for the overlapped structure
+ mPtrOverlapped = Marshal.AllocHGlobal(Marshal.SizeOf(typeof (NativeOverlapped)));
+ }
+
+ public IntPtr InternalLow
+ {
+ get { return Marshal.ReadIntPtr(mPtrOverlapped, FieldOffsetInternalLow); }
+ set { Marshal.WriteIntPtr(mPtrOverlapped, FieldOffsetInternalLow, value); }
+ }
+
+ public IntPtr InternalHigh
+ {
+ get { return Marshal.ReadIntPtr(mPtrOverlapped, FieldOffsetInternalHigh); }
+ set { Marshal.WriteIntPtr(mPtrOverlapped, FieldOffsetInternalHigh, value); }
+ }
+
+ public int OffsetLow
+ {
+ get { return Marshal.ReadInt32(mPtrOverlapped, FieldOffsetOffsetLow); }
+ set { Marshal.WriteInt32(mPtrOverlapped, FieldOffsetOffsetLow, value); }
+ }
+
+ public int OffsetHigh
+ {
+ get { return Marshal.ReadInt32(mPtrOverlapped, FieldOffsetOffsetHigh); }
+ set { Marshal.WriteInt32(mPtrOverlapped, FieldOffsetOffsetHigh, value); }
+ }
+
+ /// <summary>
+ /// The overlapped event wait hande.
+ /// </summary>
+ public IntPtr EventHandle
+ {
+ get { return Marshal.ReadIntPtr(mPtrOverlapped, FieldOffsetEventHandle); }
+ set { Marshal.WriteIntPtr(mPtrOverlapped, FieldOffsetEventHandle, value); }
+ }
+
+ /// <summary>
+ /// Pass this into the DeviceIoControl and GetOverlappedResult APIs
+ /// </summary>
+ public IntPtr GlobalOverlapped
+ {
+ get { return mPtrOverlapped; }
+ }
+
+ #region IDisposable Members
+
+ public void Dispose()
+ {
+ if (mPtrOverlapped != IntPtr.Zero)
+ {
+ Marshal.FreeHGlobal(mPtrOverlapped);
+ mPtrOverlapped = IntPtr.Zero;
+ }
+ }
+
+ #endregion
+
+ /// <summary>
+ /// Set the overlapped wait handle and clear out the rest of the structure.
+ /// </summary>
+ /// <param name="hEventOverlapped"></param>
+ public void ClearAndSetEvent(IntPtr hEventOverlapped)
+ {
+ EventHandle = hEventOverlapped;
+ InternalLow = IntPtr.Zero;
+ InternalHigh = IntPtr.Zero;
+ OffsetLow = 0;
+ OffsetHigh = 0;
+ }
+
+
+ // Clean up the globally allocated memory.
+ ~SafeOverlapped() { Dispose(); }
+ }
+}
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