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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#include "oox/helper/binarystreambase.hxx"
#include <osl/diagnose.h>
using ::com::sun::star::uno::Reference;
using ::com::sun::star::uno::Exception;
using ::com::sun::star::io::XSeekable;
namespace oox {
// ============================================================================
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_ENSURE( false, "BinaryXSeekableStream::getLength - exception caught" );
}
return -1;
}
sal_Int64 BinaryXSeekableStream::tell() const
{
if( mxSeekable.is() ) try
{
return mxSeekable->getPosition();
}
catch( Exception& )
{
OSL_ENSURE( false, "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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