145 lines
3.5 KiB
C#
145 lines
3.5 KiB
C#
/*
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KeePass Password Safe - The Open-Source Password Manager
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Copyright (C) 2003-2012 Dominik Reichl <dominik.reichl@t-online.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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using System.Diagnostics;
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#if !KeePassLibSD
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using System.Security.AccessControl;
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#endif
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using KeePassLib.Utility;
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namespace KeePassLib.Serialization
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{
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public sealed class FileTransactionEx
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{
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private bool m_bTransacted;
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private IOConnectionInfo m_iocBase;
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private IOConnectionInfo m_iocTemp;
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private bool m_bMadeUnhidden = false;
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private const string StrTempSuffix = ".tmp";
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public FileTransactionEx(IOConnectionInfo iocBaseFile)
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{
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Initialize(iocBaseFile, true);
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}
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public FileTransactionEx(IOConnectionInfo iocBaseFile, bool bTransacted)
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{
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Initialize(iocBaseFile, bTransacted);
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}
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private void Initialize(IOConnectionInfo iocBaseFile, bool bTransacted)
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{
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if(iocBaseFile == null) throw new ArgumentNullException("iocBaseFile");
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m_bTransacted = bTransacted;
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m_iocBase = iocBaseFile.CloneDeep();
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if(m_bTransacted)
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{
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m_iocTemp = m_iocBase.CloneDeep();
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m_iocTemp.Path += StrTempSuffix;
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}
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else m_iocTemp = m_iocBase;
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}
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public Stream OpenWrite()
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{
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if(!m_bTransacted) m_bMadeUnhidden = UrlUtil.UnhideFile(m_iocTemp.Path);
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else // m_bTransacted
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{
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try { IOConnection.DeleteFile(m_iocTemp); }
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catch(Exception) { }
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}
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return IOConnection.OpenWrite(m_iocTemp);
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}
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public void CommitWrite()
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{
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if(m_bTransacted) CommitWriteTransaction();
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else // !m_bTransacted
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{
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if(m_bMadeUnhidden) UrlUtil.HideFile(m_iocTemp.Path, true); // Hide again
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}
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}
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private void CommitWriteTransaction()
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{
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bool bMadeUnhidden = UrlUtil.UnhideFile(m_iocBase.Path);
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#if !KeePassLibSD
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FileSecurity bkSecurity = null;
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bool bEfsEncrypted = false;
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#endif
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if(IOConnection.FileExists(m_iocBase))
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{
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#if !KeePassLibSD
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if(m_iocBase.IsLocalFile())
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{
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try
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{
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FileAttributes faBase = File.GetAttributes(m_iocBase.Path);
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bEfsEncrypted = ((long)(faBase & FileAttributes.Encrypted) != 0);
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DateTime tCreation = File.GetCreationTime(m_iocBase.Path);
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bkSecurity = File.GetAccessControl(m_iocBase.Path);
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File.SetCreationTime(m_iocTemp.Path, tCreation);
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}
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catch(Exception) { Debug.Assert(false); }
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}
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#endif
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IOConnection.DeleteFile(m_iocBase);
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}
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IOConnection.RenameFile(m_iocTemp, m_iocBase);
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#if !KeePassLibSD
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if(m_iocBase.IsLocalFile())
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{
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try
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{
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if(bEfsEncrypted)
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{
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try { File.Encrypt(m_iocBase.Path); }
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catch(Exception) { Debug.Assert(false); }
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}
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if(bkSecurity != null)
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File.SetAccessControl(m_iocBase.Path, bkSecurity);
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}
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catch(Exception) { Debug.Assert(false); }
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}
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#endif
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if(bMadeUnhidden) UrlUtil.HideFile(m_iocBase.Path, true); // Hide again
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}
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}
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}
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