/**************************************************************
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_xmlsecurity.hxx"

#include <xmlsecurity/biginteger.hxx>

#include <sal/types.h>
//For reasons that escape me, this is what xmlsec does when size_t is not 4
#if SAL_TYPES_SIZEOFPOINTER != 4
#    define XMLSEC_NO_SIZE_T
#endif
#include <xmlsec/xmlsec.h>
#include <xmlsec/bn.h>
#include <com/sun/star/uno/Sequence.hxx>

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

Sequence< sal_Int8 > numericStringToBigInteger ( OUString numeral )
{
	if( numeral.getStr() != NULL )
	{
		xmlChar* chNumeral ;
		const xmlSecByte* bnInteger ;
		xmlSecSize length ;
		xmlSecBn bn ;

		rtl::OString onumeral = rtl::OUStringToOString( numeral , RTL_TEXTENCODING_ASCII_US ) ;

		chNumeral = xmlStrndup( ( const xmlChar* )onumeral.getStr(), ( 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 == NULL ) {
			xmlSecBnFinalize( &bn ) ;
			return Sequence< sal_Int8 >();
		}

		Sequence< sal_Int8 > integer( length ) ;
		for( unsigned int i = 0 ; i < length ; i ++ )
		{
			integer[i] = *( bnInteger + i ) ;
		}

		xmlSecBnFinalize( &bn ) ;
		return integer ;
	}

	return Sequence< sal_Int8 >();
}

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

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

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

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

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

		aRet = OUString::createFromAscii( ( const char* )chNumeral ) ;

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

	return aRet ;
}