2 // MemoryMappedViewStream.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
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
32 using Microsoft.Win32.SafeHandles;
34 namespace System.IO.MemoryMappedFiles
36 public sealed class MemoryMappedViewStream : UnmanagedMemoryStream {
40 internal MemoryMappedViewStream (IntPtr handle, long offset, long size, MemoryMappedFileAccess access) {
41 monitor = new Object ();
42 CreateStream (handle, offset, size, access);
45 public SafeMemoryMappedViewHandle SafeMemoryMappedViewHandle {
47 throw new NotImplementedException ();
51 unsafe void CreateStream (IntPtr handle, long offset, long size, MemoryMappedFileAccess access)
55 MemoryMapImpl.Map (handle, offset, ref size, access, out mmap_handle, out base_address);
59 case MemoryMappedFileAccess.ReadWrite:
60 faccess = FileAccess.ReadWrite;
62 case MemoryMappedFileAccess.Read:
63 faccess = FileAccess.Read;
65 case MemoryMappedFileAccess.Write:
66 faccess = FileAccess.Write;
69 throw new NotImplementedException ("access mode " + access + " not supported.");
71 Initialize ((byte*)base_address, size, size, faccess);
74 protected override void Dispose (bool disposing)
76 base.Dispose (disposing);
78 if (mmap_handle != (IntPtr)(-1)) {
79 MemoryMapImpl.Unmap (mmap_handle);
80 mmap_handle = (IntPtr)(-1);
85 public override void Flush ()
87 MemoryMapImpl.Flush (mmap_handle);