/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */


#include <biginteger.hxx>

#include <com/sun/star/uno/Sequence.hxx>
#include <xmlsec/xmlsec.h>
#include <xmlsec/bn.h>

#include <comphelper/sequence.hxx>

using namespace ::com::sun::star::uno ;

namespace xmlsecurity
{
Sequence< sal_Int8 > numericStringToBigInteger ( std::u16string_view numeral )
{
    xmlChar* chNumeral ;
    const xmlSecByte* bnInteger ;
    xmlSecSize length ;
    xmlSecBn bn ;

    OString onumeral = OUStringToOString( numeral , RTL_TEXTENCODING_ASCII_US ) ;

    chNumeral = xmlStrndup( reinterpret_cast<const xmlChar*>(onumeral.getStr()), static_cast<int>(onumeral.getLength()) ) ;

    if( xmlSecBnInitialize( &bn, 0 ) < 0 ) {
        xmlFree( chNumeral ) ;
        return Sequence< sal_Int8 >();
    }

    if( xmlSecBnFromDecString( &bn, chNumeral ) < 0 ) {
        xmlFree( chNumeral ) ;
        xmlSecBnFinalize( &bn ) ;
        return Sequence< sal_Int8 >();
    }

    xmlFree( chNumeral ) ;

    length = xmlSecBnGetSize( &bn ) ;
    if( length <= 0 ) {
        xmlSecBnFinalize( &bn ) ;
        return Sequence< sal_Int8 >();
    }

    bnInteger = xmlSecBnGetData( &bn ) ;
    if( bnInteger == nullptr ) {
        xmlSecBnFinalize( &bn ) ;
        return Sequence< sal_Int8 >();
    }

    Sequence< sal_Int8 > integer = comphelper::arrayToSequence<sal_Int8>(bnInteger, length);

    xmlSecBnFinalize( &bn ) ;
    return integer ;
}

OUString bigIntegerToNumericString ( const Sequence< sal_Int8 >& integer )
{
    OUString aRet ;

    if( integer.hasElements() ) {
        xmlSecBn bn ;
        xmlChar* chNumeral ;

        if( xmlSecBnInitialize( &bn, 0 ) < 0 )
            return aRet ;

        if( xmlSecBnSetData( &bn, reinterpret_cast<const unsigned char*>(integer.getConstArray()), integer.getLength() ) < 0 ) {
            xmlSecBnFinalize( &bn ) ;
            return aRet ;
        }

        chNumeral = xmlSecBnToDecString( &bn ) ;
        if( chNumeral == nullptr ) {
            xmlSecBnFinalize( &bn ) ;
            return aRet ;
        }

        aRet = OUString::createFromAscii( reinterpret_cast<char*>(chNumeral) ) ;

        xmlSecBnFinalize( &bn ) ;
        xmlFree( chNumeral ) ;
    }

    return aRet ;
}
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
