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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2021 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.Text;
using KeePassLib.Utility;
namespace KeePass.Util.Spr
{
internal sealed class SprRefCache
{
private sealed class SprRefCacheItem
{
public readonly string Ref;
public readonly string Value;
public readonly uint Context;
public SprRefCacheItem(string strRef, string strValue, uint uContext)
{
this.Ref = strRef;
this.Value = strValue;
this.Context = uContext;
}
}
private List<SprRefCacheItem> m_l = new List<SprRefCacheItem>();
public SprRefCache()
{
}
/// <summary>
/// Hash all settings of <paramref name="ctx" /> that may
/// affect the encoded value of a field reference.
/// </summary>
private static uint HashContext(SprContext ctx)
{
if(ctx == null) { Debug.Assert(false); return 0; }
uint u = 0;
if(ctx.ForcePlainTextPasswords) u |= 1;
if(ctx.EncodeForCommandLine) u |= 2;
if(ctx.EncodeAsAutoTypeSequence) u |= 4;
return u;
}
public void Clear()
{
m_l.Clear();
}
private string Get(string strRef, uint uCtx)
{
if(strRef == null) { Debug.Assert(false); return null; }
foreach(SprRefCacheItem ci in m_l)
{
if(ci.Context != uCtx) continue;
if(string.Equals(strRef, ci.Ref, StrUtil.CaseIgnoreCmp))
return ci.Value;
}
return null;
}
public bool Add(string strRef, string strValue, SprContext ctx)
{
if(strRef == null) throw new ArgumentNullException("strRef");
if(strValue == null) throw new ArgumentNullException("strValue");
uint uCtx = HashContext(ctx);
if(Get(strRef, uCtx) != null)
{
Debug.Assert(false);
return false; // Exists already, do not overwrite
}
m_l.Add(new SprRefCacheItem(strRef, strValue, uCtx));
return true;
}
public string Fill(string strText, SprContext ctx)
{
if(strText == null) { Debug.Assert(false); return string.Empty; }
string str = strText;
uint uCtx = HashContext(ctx);
foreach(SprRefCacheItem ci in m_l)
{
if(ci.Context != uCtx) continue;
// str = str.Replace(ci.Ref, ci.Value);
str = StrUtil.ReplaceCaseInsensitive(str, ci.Ref, ci.Value);
}
return str;
}
}
}
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