libreoffice/xmlhelp/source/cxxhelp/provider/inputstream.cxx

/*************************************************************************
 *
 *  OpenOffice.org - a multi-platform office productivity suite
 *
 *  $RCSfile: inputstream.cxx,v $
 *
 *  $Revision: 1.4 $
 *
 *  last change: $Author: obo $ $Date: 2006-09-17 01:16:59 $
 *
 *  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
 *
 ************************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_xmlhelp.hxx"
#ifndef _INPUSTREAM_HXX_
#include "inputstream.hxx"
#endif


using namespace chelp;
using namespace com::sun::star;
using namespace com::sun::star::ucb;



XInputStream_impl::XInputStream_impl( const rtl::OUString& aUncPath )
    : m_bIsOpen( false ),
      m_aFile( aUncPath )
{
    m_bIsOpen = ( osl::FileBase::E_None == m_aFile.open( OpenFlag_Read ) );
}


XInputStream_impl::~XInputStream_impl()
{
    closeInput();
}


bool SAL_CALL XInputStream_impl::CtorSuccess()
{
    return m_bIsOpen;
};


uno::Any SAL_CALL
XInputStream_impl::queryInterface(
    const uno::Type& rType )
    throw( uno::RuntimeException)
{
    uno::Any aRet = cppu::queryInterface( rType,
                                          SAL_STATIC_CAST( io::XInputStream*,this ),
                                          SAL_STATIC_CAST( io::XSeekable*,this ) );
    return aRet.hasValue() ? aRet : OWeakObject::queryInterface( rType );
}


void SAL_CALL
XInputStream_impl::acquire(
    void )
    throw()
{
    OWeakObject::acquire();
}


void SAL_CALL
XInputStream_impl::release(
    void )
    throw()
{
    OWeakObject::release();
}



sal_Int32 SAL_CALL
XInputStream_impl::readBytes(
                 uno::Sequence< sal_Int8 >& aData,
                 sal_Int32 nBytesToRead )
    throw( io::NotConnectedException,
           io::BufferSizeExceededException,
           io::IOException,
           uno::RuntimeException)
{
    if( ! m_bIsOpen )
        throw io::IOException();

    aData.realloc(nBytesToRead);
    //TODO! translate memory exhaustion (if it were detectable...) into
    // io::BufferSizeExceededException

    sal_uInt64 nrc;
    m_aFile.read( aData.getArray(),sal_uInt64(nBytesToRead),nrc );

    // Shrink aData in case we read less than nBytesToRead (XInputStream
    // documentation does not tell whether this is required, and I do not know
    // if any code relies on this, so be conservative---SB):
    if (nrc != sal::static_int_cast<sal_uInt64>( nBytesToRead) )
        aData.realloc(sal_Int32(nrc));
    return ( sal_Int32 ) nrc;
}

sal_Int32 SAL_CALL
XInputStream_impl::readSomeBytes(
    uno::Sequence< sal_Int8 >& aData,
    sal_Int32 nMaxBytesToRead )
    throw( io::NotConnectedException,
           io::BufferSizeExceededException,
           io::IOException,
           uno::RuntimeException)
{
    return readBytes( aData,nMaxBytesToRead );
}


void SAL_CALL
XInputStream_impl::skipBytes(
    sal_Int32 nBytesToSkip )
    throw( io::NotConnectedException,
           io::BufferSizeExceededException,
           io::IOException,
           uno::RuntimeException)
{
    m_aFile.setPos( osl_Pos_Current, sal_uInt64( nBytesToSkip ) );
}


sal_Int32 SAL_CALL
XInputStream_impl::available(
    void )
    throw( io::NotConnectedException,
           io::IOException,
           uno::RuntimeException)
{
    return 0;
}


void SAL_CALL
XInputStream_impl::closeInput(
    void )
    throw( io::NotConnectedException,
           io::IOException,
           uno::RuntimeException )
{
    if( m_bIsOpen )
    {
        osl::FileBase::RC err = m_aFile.close();
        if( err != osl::FileBase::E_None )
            throw io::IOException();
        m_bIsOpen = false;
    }
}


void SAL_CALL
XInputStream_impl::seek(
    sal_Int64 location )
    throw( lang::IllegalArgumentException,
           io::IOException,
           uno::RuntimeException )
{
    if( location < 0 )
        throw lang::IllegalArgumentException();
    if( osl::FileBase::E_None != m_aFile.setPos( Pos_Absolut, sal_uInt64( location ) ) )
        throw io::IOException();
}


sal_Int64 SAL_CALL
XInputStream_impl::getPosition(
    void )
    throw( io::IOException,
           uno::RuntimeException )
{
    sal_uInt64 uPos;
    if( osl::FileBase::E_None != m_aFile.getPos( uPos ) )
        throw io::IOException();
    return sal_Int64( uPos );
}

sal_Int64 SAL_CALL
XInputStream_impl::getLength(
    void )
    throw( io::IOException,
           uno::RuntimeException )
{
    osl::FileBase::RC   err;
    sal_uInt64          uCurrentPos, uEndPos;

    err = m_aFile.getPos( uCurrentPos );
    if( err != osl::FileBase::E_None )
        throw io::IOException();

    err = m_aFile.setPos( Pos_End, 0 );
    if( err != osl::FileBase::E_None )
        throw io::IOException();

    err = m_aFile.getPos( uEndPos );
    if( err != osl::FileBase::E_None )
        throw io::IOException();

    err = m_aFile.setPos( Pos_Absolut, uCurrentPos );
    if( err != osl::FileBase::E_None )
        throw io::IOException();
    else
        return sal_Int64( uEndPos );
}