5 // Marcos Henrich (marcos.henrich@gmail.com)
7 // Copyright (C) 2015, Xamarin, Inc
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 System.Diagnostics;
33 using System.Collections.Generic;
34 using Microsoft.Win32.SafeHandles;
36 namespace System.IO.MemoryMappedFiles
38 internal class MemoryMappedView : IDisposable {
39 private SafeMemoryMappedViewHandle m_viewHandle;
40 private Int64 m_pointerOffset;
42 private MemoryMappedFileAccess m_access;
44 [System.Security.SecurityCritical]
45 private unsafe MemoryMappedView(SafeMemoryMappedViewHandle viewHandle, Int64 pointerOffset,
46 Int64 size, MemoryMappedFileAccess access) {
48 m_viewHandle = viewHandle;
49 m_pointerOffset = pointerOffset;
54 internal SafeMemoryMappedViewHandle ViewHandle {
55 [System.Security.SecurityCritical]
61 internal Int64 PointerOffset {
63 return m_pointerOffset;
73 internal MemoryMappedFileAccess Access {
79 internal unsafe static MemoryMappedView Create (IntPtr handle, long offset, long size, MemoryMappedFileAccess access)
84 MemoryMapImpl.Map (handle, offset, ref size, access, out mmap_handle, out base_address);
86 var safe_handle = new SafeMemoryMappedViewHandle (mmap_handle, base_address, size);
88 // MemoryMapImpl.Map returns a base_address to the offset so MemoryMappedView is initiated
90 return new MemoryMappedView (safe_handle, 0, size, access);
93 public void Flush (IntPtr capacity)
95 MemoryMapImpl.Flush (m_viewHandle.DangerousGetHandle ());
98 protected virtual void Dispose (bool disposing)
100 if (m_viewHandle != null && !m_viewHandle.IsClosed) {
101 m_viewHandle.Dispose ();
105 public void Dispose ()
108 GC.SuppressFinalize (this);
111 internal bool IsClosed {
113 return (m_viewHandle == null || m_viewHandle.IsClosed);