/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   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 .
 */

#include "oox/helper/binarystreambase.hxx"
#include <oox/helper/helper.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( rxSeekable.is() ),
    mxSeekable( rxSeekable )
{
}

BinaryXSeekableStream::~BinaryXSeekableStream()
{
}

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

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 = nullptr;
    mbEof = true;
}

} // namespace oox

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