cleaned the RS link code, factorized the parsing into a single class. Still missing: copy/paste of multiple links

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@2514 b45a01b8-16f6-495d-af2f-9b41ad6348cc

retroshare-gui/src/gui/RetroShareLink.cpp

@@ -0,0 +1,143 @@
+/***************************************************************************
+ *   Copyright (C) 2009                                                    *
+ *                                                                         *
+ *   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.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#include <iostream>
+#include <QStringList>
+#include "RetroShareLink.h"
+
+#define DEBUG_RSLINK 1
+
+const QString RetroShareLink::HEADER_NAME("retroshare://file");
+
+RetroShareLink::RetroShareLink(const QString & url)
+{
+	// parse
+#ifdef DEBUG_RSLINK
+	std::cerr << "got new RS link \"" << url.toStdString() << "\"" << std::endl ;
+#endif
+	QStringList urlList = url.split ("\n");
+
+	if(urlList.isEmpty ())
+		goto bad_link ;
+
+	{
+		QStringList list = urlList[0].split ("|");
+
+		bool ok ;
+
+		_name = list[1] ;
+		_size = list[2].toULongLong(&ok) ;
+		_hash = list[3].left(40) ;	// normally not necessary, but it's a security.
+
+		if(!ok)
+			goto bad_link ;
+#ifdef DEBUG_RSLINK
+		std::cerr << "New RetroShareLink forged:" << std::endl ;
+		std::cerr << "  name = \"" << _name.toStdString() << "\"" << std::endl ;
+		std::cerr << "  hash = \"" << _hash.toStdString() << "\"" << std::endl ;
+		std::cerr << "  size = " << _size << std::endl ;
+#endif
+	}
+
+	 check() ;
+
+	 return ;
+bad_link:
+#ifdef DEBUG_RSLINK
+	 std::cerr << "Wrongly formed RS link. Can't process." << std::endl ;
+#endif
+	 _hash = "" ;
+	 _size = 0 ;
+	 _name = "" ;
+}
+
+RetroShareLink::RetroShareLink(const QString & name, uint64_t size, const QString & hash)
+	: _name(name),_size(size),_hash(hash)
+{
+	check() ;
+}
+
+void RetroShareLink::check()
+{
+	bool valid = true ;
+
+	if(_size > (((uint64_t)1)<<40))	// 1TB. Who has such large files?
+		valid = false ;
+
+	if(!checkName(_name))
+		valid = false ;
+
+	if(!checkHash(_hash))
+		valid = false ;
+
+	if(!valid) // we should throw an exception instead of this crap, but drbob doesn't like exceptions. Why ???
+	{
+		_hash = "" ;
+		_name = "" ;
+		_size = 0 ;
+	}
+}
+
+QString RetroShareLink::toString() const
+{
+	return HEADER_NAME + "|" + _name + "|" + QString::number(_size) + "|" + _hash ;
+}
+
+bool RetroShareLink::checkName(const QString& name)
+{
+	if(name == "") 
+		return false ;
+
+	for(int i=0;i<name.length();++i)
+	{
+		QChar::Category cat( name[i].category() ) ;
+
+		if(	cat == QChar::Separator_Line
+			|| cat == QChar::Other_NotAssigned
+			)
+		{
+#ifdef DEBUG_RSLINK
+			std::cerr <<"Unwanted category " << cat << " at place " << i << " in string \"" << name.toStdString() << "\"" << std::endl ;
+#endif
+			return false ;
+		}
+	}
+
+	return true ;
+}
+
+bool RetroShareLink::checkHash(const QString& hash)
+{
+	if(hash.length() != 40)
+		return false ;
+
+	QByteArray qb(hash.toAscii()) ;
+
+	for(int i=0;i<qb.length();++i)
+	{
+		unsigned char b(qb[i]) ;
+
+		if(!((b>47 && b<58) || (b>96 && b<103)))
+			return false ;
+	}
+
+	return true ;
+}
+
+