libreoffice/oox/source/helper/binarystreambase.cxx

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 *
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
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 * <http://www.openoffice.org/license.html>
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#include "oox/helper/binarystreambase.hxx"

#include <osl/diagnose.h>

namespace oox {

// ============================================================================

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

// ============================================================================

BinaryStreamBase::~BinaryStreamBase()
{
}

bool BinaryStreamBase::isSeekable() const
{
    return false;
}

sal_Int64 BinaryStreamBase::getLength() const
{
    return -1;
}

sal_Int64 BinaryStreamBase::tell() const
{
    return -1;
}

void BinaryStreamBase::seek( sal_Int64 )
{
}

sal_Int64 BinaryStreamBase::getRemaining() const
{
    // do not use isSeekable(), implementations may provide stream position and size even if not seekable
    sal_Int64 nPos = tell();
    sal_Int64 nLen = getLength();
    return ((nPos >= 0) && (nLen >= 0)) ? ::std::max< sal_Int64 >( nLen - nPos, 0 ) : -1;
}

void BinaryStreamBase::alignToBlock( sal_Int32 nBlockSize, sal_Int64 nAnchorPos )
{
    sal_Int64 nStrmPos = tell();
    // nothing to do, if stream is at anchor position
    if( isSeekable() && (0 <= nAnchorPos) && (nAnchorPos != nStrmPos) && (nBlockSize > 1) )
    {
        // prevent modulo with negative arguments...
        sal_Int64 nSkipSize = (nAnchorPos < nStrmPos) ?
            (nBlockSize - ((nStrmPos - nAnchorPos - 1) % nBlockSize) - 1) :
            ((nAnchorPos - nStrmPos) % nBlockSize);
        seek( nStrmPos + nSkipSize );
    }
}

// ============================================================================

BinaryXSeekableStream::BinaryXSeekableStream( const Reference< XSeekable >& rxSeekable ) :
    mxSeekable( rxSeekable )
{
}

bool BinaryXSeekableStream::isSeekable() const
{
    return mxSeekable.is();
}

sal_Int64 BinaryXSeekableStream::getLength() const
{
    if( mxSeekable.is() ) try
    {
        return mxSeekable->getLength();
    }
    catch( Exception& )
    {
        OSL_FAIL( "BinaryXSeekableStream::getLength - exception caught" );
    }
    return -1;
}

sal_Int64 BinaryXSeekableStream::tell() const
{
    if( mxSeekable.is() ) try
    {
        return mxSeekable->getPosition();
    }
    catch( Exception& )
    {
        OSL_FAIL( "BinaryXSeekableStream::tell - exception caught" );
    }
    return -1;
}

void BinaryXSeekableStream::seek( sal_Int64 nPos )
{
    if( mxSeekable.is() ) try
    {
        mbEof = false;
        mxSeekable->seek( nPos );
    }
    catch( Exception& )
    {
        mbEof = true;
    }
}

// ============================================================================

bool SequenceSeekableStream::isSeekable() const
{
    return true;
}

sal_Int64 SequenceSeekableStream::getLength() const
{
    return mrData.getLength();
}

sal_Int64 SequenceSeekableStream::tell() const
{
    return mnPos;
}

void SequenceSeekableStream::seek( sal_Int64 nPos )
{
    mnPos = getLimitedValue< sal_Int32, sal_Int64 >( nPos, 0, mrData.getLength() );
    mbEof = mnPos != nPos;
}

// ============================================================================

} // namespace oox

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