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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.DataExchange
{
public sealed class CsvOptions
{
private char m_chFieldSep = ',';
public char FieldSeparator
{
get { return m_chFieldSep; }
set { m_chFieldSep = value; }
}
private char m_chRecSep = '\n';
public char RecordSeparator
{
get { return m_chRecSep; }
set { m_chRecSep = value; }
}
private char m_chTextQual = '\"';
public char TextQualifier
{
get { return m_chTextQual; }
set { m_chTextQual = value; }
}
private bool m_bBackEscape = true;
public bool BackslashIsEscape
{
get { return m_bBackEscape; }
set { m_bBackEscape = value; }
}
private bool m_bTrimFields = true;
public bool TrimFields
{
get { return m_bTrimFields; }
set { m_bTrimFields = value; }
}
private string m_strNewLineSeq = "\r\n";
public string NewLineSequence
{
get { return m_strNewLineSeq; }
set
{
if(value == null) throw new ArgumentNullException("value");
m_strNewLineSeq = value;
}
}
}
public sealed class CsvStreamReaderEx
{
private CharStream m_sChars;
private CsvOptions m_opt;
public CsvStreamReaderEx(string strData)
{
Init(strData, null);
}
public CsvStreamReaderEx(string strData, CsvOptions opt)
{
Init(strData, opt);
}
private void Init(string strData, CsvOptions opt)
{
if(strData == null) throw new ArgumentNullException("strData");
m_opt = (opt ?? new CsvOptions());
string strInput = strData;
// Normalize to Unix "\n" right now; the new lines are
// converted back in the <c>AddField</c> method
strInput = StrUtil.NormalizeNewLines(strInput, false);
strInput = strInput.Trim(new char[] { (char)0 });
m_sChars = new CharStream(strInput);
}
public string[] ReadLine()
{
char chFirst = m_sChars.PeekChar();
if(chFirst == char.MinValue) return null;
List<string> v = new List<string>();
StringBuilder sb = new StringBuilder();
bool bInText = false;
char chFS = m_opt.FieldSeparator, chRS = m_opt.RecordSeparator;
char chTQ = m_opt.TextQualifier;
while(true)
{
char ch = m_sChars.ReadChar();
if(ch == char.MinValue) break;
Debug.Assert(ch != '\r'); // Was normalized to Unix "\n"
if((ch == '\\') && m_opt.BackslashIsEscape)
{
char chEsc = m_sChars.ReadChar();
if(chEsc == char.MinValue) break;
if(chEsc == 'n') sb.Append('\n');
else if(chEsc == 'r') sb.Append('\r');
else if(chEsc == 't') sb.Append('\t');
else if(chEsc == 'u')
{
char chNum1 = m_sChars.ReadChar();
char chNum2 = m_sChars.ReadChar();
char chNum3 = m_sChars.ReadChar();
char chNum4 = m_sChars.ReadChar();
if(chNum4 != char.MinValue) // Implies the others
{
StringBuilder sbNum = new StringBuilder();
sbNum.Append(chNum3); // Little-endian
sbNum.Append(chNum4);
sbNum.Append(chNum1);
sbNum.Append(chNum2);
byte[] pbNum = MemUtil.HexStringToByteArray(sbNum.ToString());
ushort usNum = MemUtil.BytesToUInt16(pbNum);
sb.Append((char)usNum);
}
}
else sb.Append(chEsc);
}
else if(ch == chTQ)
{
if(!bInText) bInText = true;
else // bInText
{
char chNext = m_sChars.PeekChar();
if(chNext == chTQ)
{
m_sChars.ReadChar();
sb.Append(chTQ);
}
else bInText = false;
}
}
else if((ch == chRS) && !bInText) break;
else if(bInText) sb.Append(ch);
else if(ch == chFS)
{
AddField(v, sb.ToString());
if(sb.Length > 0) sb.Remove(0, sb.Length);
}
else sb.Append(ch);
}
// Debug.Assert(!bInText);
AddField(v, sb.ToString());
return v.ToArray();
}
private void AddField(List<string> v, string strField)
{
// Escape characters might have been used to insert
// new lines that might not conform to Unix "\n"
strField = StrUtil.NormalizeNewLines(strField, false);
// Transform to final form of new lines
strField = strField.Replace("\n", m_opt.NewLineSequence);
if(m_opt.TrimFields) strField = strField.Trim();
v.Add(strField);
}
}
}
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