AOO410/main/oox/source/helper/binarystreambase.cxx

/**************************************************************
 * 
 * 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
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 *************************************************************/



#include "oox/helper/binarystreambase.hxx"

#include <com/sun/star/io/XSeekable.hpp>
#include <osl/diagnose.h>

namespace oox {

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

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

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

BinaryStreamBase::~BinaryStreamBase()
{
}

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 = size();
    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( mbSeekable && (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 ) :
    BinaryStreamBase( mxSeekable.is() ),
    mxSeekable( rxSeekable )
{
}

BinaryXSeekableStream::~BinaryXSeekableStream()
{
}

sal_Int64 BinaryXSeekableStream::size() const
{
    if( mxSeekable.is() ) try
    {
        return mxSeekable->getLength();
    }
    catch( Exception& )
    {
        OSL_ENSURE( false, "BinaryXSeekableStream::size - 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;
    }
}

void BinaryXSeekableStream::close()
{
    mxSeekable.clear();
    mbEof = true;
}

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

SequenceSeekableStream::SequenceSeekableStream( const StreamDataSequence& rData ) :
    BinaryStreamBase( true ),
    mpData( &rData ),
    mnPos( 0 )
{
}

sal_Int64 SequenceSeekableStream::size() const
{
    return mpData ? mpData->getLength() : -1;
}

sal_Int64 SequenceSeekableStream::tell() const
{
    return mpData ? mnPos : -1;
}

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

void SequenceSeekableStream::close()
{
    mpData = 0;
    mbEof = true;
}

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

} // namespace oox