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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2024 Dominik Reichl <dominik.reichl@t-online.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;
using KeePassLib.Utility;
namespace KeePassLib.Native
{
internal sealed class NativeBufferEx : IDisposable
{
// private readonly int m_cbMemory;
private IntPtr m_pbMemory; // Unaligned
private readonly int m_cbData;
private IntPtr m_pbData; // Aligned
private readonly bool m_bZeroOnDispose;
public IntPtr Data
{
get { return m_pbData; }
}
public NativeBufferEx(int cbData, bool bZeroOnConstruct,
bool bZeroOnDispose, bool bThrowExcp, int cbAlignment)
{
try
{
if(cbData < 0) throw new ArgumentOutOfRangeException("cbData");
if(cbAlignment == 0) cbAlignment = IntPtr.Size;
int cbAM1 = cbAlignment - 1;
if((cbAlignment < 0) || ((cbAlignment & cbAM1) != 0)) // Power of 2
throw new ArgumentOutOfRangeException("cbAlignment");
int cb = cbData + cbAM1;
if(cb < 0) throw new OverflowException();
IntPtr pb = Marshal.AllocCoTaskMem(cb);
if(pb == IntPtr.Zero) throw new OutOfMemoryException();
// m_cbMemory = cb;
m_pbMemory = pb;
m_cbData = cbData;
m_bZeroOnDispose = bZeroOnDispose;
if(IntPtr.Size >= 8)
{
long lAM1 = cbAM1; // '~' on Int64, not on Int32
m_pbData = new IntPtr((pb.ToInt64() + lAM1) & ~lAM1);
}
else
m_pbData = new IntPtr((pb.ToInt32() + cbAM1) & ~cbAM1);
if(bZeroOnConstruct) MemUtil.ZeroMemory(m_pbData, cbData);
}
catch(Exception)
{
Debug.Assert(false);
Dispose(true);
if(bThrowExcp) throw;
}
}
public NativeBufferEx(byte[] pbInitialData, bool bZeroOnDispose,
bool bThrowExcp, int cbAlignment) :
this(((pbInitialData != null) ? pbInitialData.Length : 0),
false, bZeroOnDispose, bThrowExcp, cbAlignment)
{
try
{
if(pbInitialData == null) throw new ArgumentNullException("pbInitialData");
if(m_pbData != IntPtr.Zero)
Marshal.Copy(pbInitialData, 0, m_pbData, m_cbData);
}
catch(Exception)
{
Debug.Assert(false);
Dispose(true);
if(bThrowExcp) throw;
}
}
~NativeBufferEx()
{
Dispose(false);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool bDisposing)
{
if(m_pbData != IntPtr.Zero)
{
if(m_bZeroOnDispose) MemUtil.ZeroMemory(m_pbData, m_cbData);
m_pbData = IntPtr.Zero;
}
if(m_pbMemory != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_pbMemory);
m_pbMemory = IntPtr.Zero;
}
}
public void CopyTo(byte[] pb)
{
if(pb == null) throw new ArgumentNullException("pb");
if(pb.Length != m_cbData) throw new ArgumentOutOfRangeException("pb");
if(m_pbData == IntPtr.Zero) throw new ObjectDisposedException(null);
Marshal.Copy(m_pbData, pb, 0, m_cbData);
}
}
}
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