/* -*- 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 <sal/config.h>

#include <sal/log.hxx>

#include <com/sun/star/io/IOException.hpp>

#include <utility>

#include <osl/diagnose.h>

#include "wrapstreamforshare.hxx"

using namespace ::com::sun::star;

WrapStreamForShare::WrapStreamForShare( uno::Reference< io::XInputStream > xInStream,

                                        rtl::Reference< comphelper::RefCountedMutex > xMutexRef )

: m_xMutex(std::move( xMutexRef ))

, m_xInStream(std::move( xInStream ))

, m_nCurPos( 0 )

{

    if ( !m_xMutex.is() || !m_xInStream.is() )

    {

        OSL_FAIL( "Wrong initialization of wrapping stream!" );

        throw uno::RuntimeException();

    }

    m_xSeekable.set( m_xInStream, uno::UNO_QUERY_THROW );

    mpByteReader = dynamic_cast<comphelper::ByteReader*>(m_xInStream.get());

    assert(mpByteReader);

}

WrapStreamForShare::~WrapStreamForShare()

{

}

// XInputStream

sal_Int32 SAL_CALL WrapStreamForShare::readBytes( uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )

{

    if ( !m_xInStream.is() )

        throw io::IOException();

    m_xSeekable->seek( m_nCurPos );

    sal_Int32 nRead = m_xInStream->readBytes( aData, nBytesToRead );

    m_nCurPos += nRead;

    return nRead;

}

sal_Int32 SAL_CALL WrapStreamForShare::readSomeBytes( uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )

{

    if ( !m_xInStream.is() )

        throw io::IOException();

    m_xSeekable->seek( m_nCurPos );

    sal_Int32 nRead = m_xInStream->readSomeBytes( aData, nMaxBytesToRead );

    m_nCurPos += nRead;

    return nRead;

}

sal_Int32 WrapStreamForShare::readSomeBytes( sal_Int8* aData, sal_Int32 nMaxBytesToRead )

{

    if ( !m_xInStream.is() )

        throw io::IOException();

    m_xSeekable->seek( m_nCurPos );

    sal_Int32 nRead = mpByteReader->readSomeBytes( aData, nMaxBytesToRead );

    m_nCurPos += nRead;

    return nRead;

}

void SAL_CALL WrapStreamForShare::skipBytes( sal_Int32 nBytesToSkip )

{

    ::osl::MutexGuard aGuard( m_xMutex->GetMutex() );

    if ( !m_xInStream.is() )

        throw io::IOException();

    m_xSeekable->seek( m_nCurPos );

    m_xInStream->skipBytes( nBytesToSkip );

    m_nCurPos = m_xSeekable->getPosition();

}

sal_Int32 SAL_CALL WrapStreamForShare::available()

{

    ::osl::MutexGuard aGuard( m_xMutex->GetMutex() );

    if ( !m_xInStream.is() )

        throw io::IOException();

    return m_xInStream->available();

}

void SAL_CALL WrapStreamForShare::closeInput()

{

    ::osl::MutexGuard aGuard( m_xMutex->GetMutex() );

    if ( !m_xInStream.is() )

        throw io::IOException();

    // the package is the owner so it will close the stream

    // m_xInStream->closeInput();

    m_xInStream.clear();

    m_xSeekable.clear();

    mpByteReader = nullptr;

}

// XSeekable

void SAL_CALL WrapStreamForShare::seek( sal_Int64 location )

{

    ::osl::MutexGuard aGuard( m_xMutex->GetMutex() );

    if ( !m_xInStream.is() )

        throw io::IOException();

    // let stream implementation do all the checking

    m_xSeekable->seek( location );

    m_nCurPos = m_xSeekable->getPosition();

}

sal_Int64 SAL_CALL WrapStreamForShare::getPosition()

{

    ::osl::MutexGuard aGuard( m_xMutex->GetMutex() );

    if ( !m_xInStream.is() )

        throw io::IOException();

    return m_nCurPos;

}

sal_Int64 SAL_CALL WrapStreamForShare::getLength()

{

    ::osl::MutexGuard aGuard( m_xMutex->GetMutex() );

    if ( !m_xInStream.is() )

        throw io::IOException();

    return m_xSeekable->getLength();

}

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