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.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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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 {
40 SafeMemoryMappedViewHandle safe_handle;
42 internal MemoryMappedViewAccessor (IntPtr handle, long offset, long size, MemoryMappedFileAccess access)
44 Create (handle, offset, size, access);
47 static FileAccess ToFileAccess (MemoryMappedFileAccess access)
50 case MemoryMappedFileAccess.CopyOnWrite:
51 case MemoryMappedFileAccess.ReadWrite:
52 case MemoryMappedFileAccess.ReadWriteExecute:
53 return FileAccess.ReadWrite;
55 case MemoryMappedFileAccess.Write:
56 return FileAccess.Write;
58 case MemoryMappedFileAccess.ReadExecute:
59 case MemoryMappedFileAccess.Read:
61 return FileAccess.Read;
65 unsafe void Create (IntPtr handle, long offset, long size, MemoryMappedFileAccess access)
69 MemoryMapImpl.Map (handle, offset, ref size, access, out mmap_handle, out base_address);
70 safe_handle = new SafeMemoryMappedViewHandle (mmap_handle, base_address, size);
72 Initialize (safe_handle, 0, size, ToFileAccess (access));
75 public SafeMemoryMappedViewHandle SafeMemoryMappedViewHandle {
81 protected override void Dispose (bool disposing)
83 base.Dispose (disposing);
86 void IDisposable.Dispose () {
92 MemoryMapImpl.Flush (mmap_handle);