2 // MemoryMappedViewAccessor.cs
5 // Zoltan Varga (vargaz@gmail.com)
7 // Copyright (C) 2009, Novell, Inc (http://www.novell.com)
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
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22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 using System.Collections.Generic;
34 using Microsoft.Win32.SafeHandles;
36 namespace System.IO.MemoryMappedFiles
38 public sealed class MemoryMappedViewAccessor : UnmanagedMemoryAccessor, IDisposable {
41 SafeMemoryMappedViewHandle handle;
43 internal MemoryMappedViewAccessor (int file_handle, long offset, long size, MemoryMappedFileAccess access)
45 this.file_handle = file_handle;
46 Create (offset, size, access);
49 static FileAccess ToFileAccess (MemoryMappedFileAccess access)
52 case MemoryMappedFileAccess.CopyOnWrite:
53 case MemoryMappedFileAccess.ReadWrite:
54 case MemoryMappedFileAccess.ReadWriteExecute:
55 return FileAccess.ReadWrite;
57 case MemoryMappedFileAccess.Write:
58 return FileAccess.Write;
60 case MemoryMappedFileAccess.ReadExecute:
61 case MemoryMappedFileAccess.Read:
63 return FileAccess.Read;
67 unsafe void Create (long offset, long size, MemoryMappedFileAccess access)
71 MemoryMapImpl.Map (file_handle, offset, ref size, access, out mmap_addr, out offset_diff);
73 handle = new SafeMemoryMappedViewHandle ((IntPtr)((long)mmap_addr + offset_diff), size);
74 Initialize (handle, 0, size, ToFileAccess (access));
77 public SafeMemoryMappedViewHandle SafeMemoryMappedViewHandle {
83 protected override void Dispose (bool disposing)
85 base.Dispose (disposing);
88 void IDisposable.Dispose () {
94 MemoryMapImpl.Flush (file_handle);