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//
// MemoryMappedView.cs
//
// Authors:
// Marcos Henrich (marcos.henrich@gmail.com)
//
// Copyright (C) 2015, Xamarin, Inc
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.IO;
using System.Diagnostics;
using System.Collections.Generic;
using Microsoft.Win32.SafeHandles;
namespace System.IO.MemoryMappedFiles
{
internal class MemoryMappedView : IDisposable {
private SafeMemoryMappedViewHandle m_viewHandle;
private Int64 m_pointerOffset;
private Int64 m_size;
private MemoryMappedFileAccess m_access;
[System.Security.SecurityCritical]
private unsafe MemoryMappedView(SafeMemoryMappedViewHandle viewHandle, Int64 pointerOffset,
Int64 size, MemoryMappedFileAccess access) {
m_viewHandle = viewHandle;
m_pointerOffset = pointerOffset;
m_size = size;
m_access = access;
}
internal SafeMemoryMappedViewHandle ViewHandle {
[System.Security.SecurityCritical]
get {
return m_viewHandle;
}
}
internal Int64 PointerOffset {
get {
return m_pointerOffset;
}
}
internal Int64 Size {
get {
return m_size;
}
}
internal MemoryMappedFileAccess Access {
get {
return m_access;
}
}
internal unsafe static MemoryMappedView Create (IntPtr handle, long offset, long size, MemoryMappedFileAccess access)
{
IntPtr base_address;
IntPtr mmap_handle;
MemoryMapImpl.Map (handle, offset, ref size, access, out mmap_handle, out base_address);
var safe_handle = new SafeMemoryMappedViewHandle (mmap_handle, base_address, size);
// MemoryMapImpl.Map returns a base_address to the offset so MemoryMappedView is initiated
// no offset.
return new MemoryMappedView (safe_handle, 0, size, access);
}
public void Flush (IntPtr capacity)
{
m_viewHandle.Flush ();
}
protected virtual void Dispose (bool disposing)
{
if (m_viewHandle != null && !m_viewHandle.IsClosed) {
m_viewHandle.Dispose ();
}
}
public void Dispose ()
{
Dispose (true);
GC.SuppressFinalize (this);
}
internal bool IsClosed {
get {
return (m_viewHandle == null || m_viewHandle.IsClosed);
}
}
}
}
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