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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2025 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.UI
{
internal sealed class AccessKeyManagerEx
{
private readonly bool[] m_vUsedLetters = new bool[26];
private readonly bool[] m_vUsedDigits = new bool[10];
#if DEBUG
private static readonly char[] g_vKeybDep = new char[] {
'\u00C4', '\u00D6', '\u00DC', '\u00E4', '\u00F6', '\u00FC'
};
#endif
private bool IsFree(char ch, out bool[] vUsed, out int iUsed)
{
if((ch >= 'A') && (ch <= 'Z'))
{
vUsed = m_vUsedLetters;
iUsed = ch - 'A';
}
else if((ch >= 'a') && (ch <= 'z'))
{
vUsed = m_vUsedLetters;
iUsed = ch - 'a';
}
else if((ch >= '0') && (ch <= '9'))
{
vUsed = m_vUsedDigits;
iUsed = ch - '0';
}
else
{
vUsed = null;
iUsed = -1;
return false;
}
return !vUsed[iUsed];
}
public string CreateText(string strText, bool bEncode)
{
return CreateText(strText, bEncode, 0);
}
private string CreateText(string strText, bool bEncode, int iPrefStart)
{
if(string.IsNullOrEmpty(strText)) { Debug.Assert(false); return string.Empty; }
if(bEncode) strText = StrUtil.EncodeMenuText(strText);
else { Debug.Assert(strText.Replace("&&", string.Empty).IndexOf('&') < 0); }
bool[] vUsed;
int iUsed, i = iPrefStart, n = strText.Length;
if((i < 0) || (i >= n)) { Debug.Assert(false); i = 0; iPrefStart = 0; }
if(n == 0) { Debug.Assert(false); return string.Empty; }
do
{
if(IsFree(strText[i], out vUsed, out iUsed))
{
vUsed[iUsed] = true;
return strText.Insert(i, "&");
}
if(++i == n) i = 0;
}
while(i != iPrefStart);
return strText;
}
public string CreateText(string strText, bool bEncode, string strParamPlh,
string strParamValue)
{
if(string.IsNullOrEmpty(strText)) { Debug.Assert(false); return string.Empty; }
if(string.IsNullOrEmpty(strParamPlh)) strParamPlh = "{PARAM}";
if(strParamValue == null) { Debug.Assert(false); strParamValue = string.Empty; }
int iParam = strText.IndexOf(strParamPlh);
string str = strText.Replace(strParamPlh, strParamValue);
return CreateText(str, bEncode, iParam);
}
public string RegisterText(string strText)
{
if(string.IsNullOrEmpty(strText)) { Debug.Assert(false); return string.Empty; }
Debug.Assert(StrUtil.Count(strText.Replace("&&", string.Empty), "&") == 1);
bool[] vUsed;
int iUsed, iOffset = 0, n = strText.Length;
do
{
int i = strText.IndexOf('&', iOffset);
if(i < iOffset) { Debug.Assert(false); break; } // No access key
int iNext = i + 1;
if(iNext == n) { Debug.Assert(false); break; } // Lonely '&' at end
char chNext = strText[iNext];
if(chNext != '&')
{
if(IsFree(chNext, out vUsed, out iUsed))
vUsed[iUsed] = true;
#if DEBUG
else if(Array.IndexOf(g_vKeybDep, chNext) >= 0) { }
else { Debug.Assert(false); } // Unknown or duplicate char.
#endif
break;
}
iOffset = iNext + 1;
}
while(iOffset < n);
return strText;
}
}
}
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