/*************************************************************************
 *
 *  OpenOffice.org - a multi-platform office productivity suite
 *
 *  $RCSfile: xmlstreamio.cxx,v $
 *
 *  $Revision: 1.2 $
 *
 *  last change: $Author: rt $ $Date: 2005-09-09 17:28:20 $
 *
 *  The Contents of this file are made available subject to
 *  the terms of GNU Lesser General Public License Version 2.1.
 *
 *
 *    GNU Lesser General Public License Version 2.1
 *    =============================================
 *    Copyright 2005 by Sun Microsystems, Inc.
 *    901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License version 2.1, as published by the Free Software Foundation.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *    MA  02111-1307  USA
 *
 ************************************************************************/

/*
 * Implementation of the I/O interfaces based on stream and URI binding
 */
#ifndef _XMLSTREAMIO_XMLSECIMPL_HXX_
#include "xmlstreamio.hxx"
#endif

#ifndef _RTL_USTRING_HXX_
#include <rtl/ustring.hxx>
#endif

#include <libxml/uri.h>
#include <xmlsec/io.h>

#define XMLSTREAMIO_INITIALIZED 0x01
#define XMLSTREAMIO_REGISTERED  0x02

/* Global variables */
/*-
 * Enable stream I/O or not.
 */
static char enableXmlStreamIO = 0x00 ;

::com::sun::star::uno::Reference< ::com::sun::star::xml::crypto::XUriBinding > m_xUriBinding ;

int xmlStreamMatch( const char* uri )
{
    ::com::sun::star::uno::Reference< com::sun::star::io::XInputStream > xInputStream ;

    if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
        ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
        if( uri == NULL || !m_xUriBinding.is() )
            return 0 ;

        xInputStream = m_xUriBinding->getUriBinding( ::rtl::OUString::createFromAscii( uri ) ) ;
        if( xInputStream.is() )
            return 1 ;
    }

    return 0 ;
}

void* xmlStreamOpen( const char* uri )
{
    ::com::sun::star::uno::Reference< com::sun::star::io::XInputStream > xInputStream ;
    ::com::sun::star::io::XInputStream* pInputStream ;

    if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
        ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
        if( uri == NULL || !m_xUriBinding.is() )
            return NULL ;

        xInputStream = m_xUriBinding->getUriBinding( ::rtl::OUString::createFromAscii( uri ) ) ;
        if( xInputStream.is() ) {
            pInputStream = xInputStream.get() ;
            pInputStream->acquire() ;
            return ( void* )pInputStream ;
        }
    }

    return NULL ;
}

int xmlStreamRead( void* context, char* buffer, int len )
{
    int numbers ;
    ::com::sun::star::uno::Reference< com::sun::star::io::XInputStream > xInputStream ;
    ::com::sun::star::uno::Sequence< sal_Int8 > outSeqs( len ) ;

    numbers = 0 ;
    if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
        ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
        if( context != NULL ) {
            xInputStream = ( com::sun::star::io::XInputStream* )context ;
            if( !xInputStream.is() )
                return 0 ;

            numbers = xInputStream->readBytes( outSeqs, len ) ;
            const sal_Int8* readBytes = ( const sal_Int8* )outSeqs.getArray() ;
            for( int i = 0 ; i < numbers ; i ++ )
                *( buffer + i ) = *( readBytes + i ) ;
        }
    }

    return numbers ;
}

int xmlStreamClose( void * context )
{
    ::com::sun::star::io::XInputStream* pInputStream ;

    if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
        ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
        if( context != NULL ) {
            pInputStream = ( ::com::sun::star::io::XInputStream* )context ;
            pInputStream->release() ;
        }
    }

    return 0 ;
}

int xmlEnableStreamInputCallbacks()
{
    int cbs = 0 ;

    if( !( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) ) {
        //Register the callbacks into libxml2
        //cbs = xmlRegisterInputCallbacks(
        //          xmlStreamMatch,
        //          xmlStreamOpen,
        //          xmlStreamRead,
        //          xmlStreamClose ) ;
        //if( cbs < 0 ) {
        //  return -1 ;
        //}

        //Register the callbacks into xmlSec
        //In order to make the xmlsec io finding the callbacks firstly,
        //I put the callbacks at the very begining.

        //Cleanup the older callbacks.
        //Notes: all none default callbacks will lose.
        xmlSecIOCleanupCallbacks() ;

        //Register my classbacks.
        cbs = xmlSecIORegisterCallbacks(
                    xmlStreamMatch,
                    xmlStreamOpen,
                    xmlStreamRead,
                    xmlStreamClose ) ;
        if( cbs < 0 ) {
            return -1 ;
        }

        //Register the default callbacks.
        //Notes: the error will cause xmlsec working problems.
        cbs = xmlSecIORegisterDefaultCallbacks() ;
        if( cbs < 0 ) {
            return -1 ;
        }

        enableXmlStreamIO |= XMLSTREAMIO_INITIALIZED ;
    }

    return 0 ;
}

int xmlRegisterStreamInputCallbacks(
    ::com::sun::star::uno::Reference< ::com::sun::star::xml::crypto::XUriBinding >& aUriBinding
) {
    if( !( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) ) {
        if( xmlEnableStreamInputCallbacks() < 0 )
            return -1 ;
    }

    if( !( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
        enableXmlStreamIO |= XMLSTREAMIO_REGISTERED ;
    }

    m_xUriBinding = aUriBinding ;

    return 0 ;
}

int xmlUnregisterStreamInputCallbacks( void )
{
    if( ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
        //Clear the uir-stream binding
        m_xUriBinding.clear() ;

        //disable the registered flag
        enableXmlStreamIO &= ~XMLSTREAMIO_REGISTERED ;
    }

    return 0 ;
}

void xmlDisableStreamInputCallbacks() {
    xmlUnregisterStreamInputCallbacks() ;
    enableXmlStreamIO &= ~XMLSTREAMIO_INITIALIZED ;
}