/* -*- 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 .
 */

#ifndef INCLUDED_UNOTOOLS_STREAMHELPER_HXX
#define INCLUDED_UNOTOOLS_STREAMHELPER_HXX

#include <unotools/unotoolsdllapi.h>
#include <com/sun/star/io/XInputStream.hpp>
#include <com/sun/star/io/XSeekable.hpp>
#include <osl/mutex.hxx>
#include <cppuhelper/implbase.hxx>
#include <tools/stream.hxx>

namespace utl
{

/**
 * The helper implementation for a using input streams based on SvLockBytes.
 */
class UNOTOOLS_DLLPUBLIC OInputStreamHelper final : public cppu::WeakImplHelper<css::io::XInputStream, css::io::XSeekable>
{
    ::osl::Mutex    m_aMutex;
    SvLockBytesRef  m_xLockBytes;
    sal_uInt64      m_nActPos;
    sal_Int32 const       m_nAvailable;   // this is typically the chunk(buffer) size

public:
    OInputStreamHelper(const SvLockBytesRef& _xLockBytes,
                       sal_uInt32 _nAvailable)
        :m_xLockBytes(_xLockBytes)
        ,m_nActPos(0)
        ,m_nAvailable(_nAvailable){}

// css::io::XInputStream
    virtual sal_Int32 SAL_CALL readBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead ) override;
    virtual sal_Int32 SAL_CALL readSomeBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead ) override;
    virtual void SAL_CALL skipBytes( sal_Int32 nBytesToSkip ) override;
    virtual sal_Int32 SAL_CALL available(  ) override;
    virtual void SAL_CALL closeInput(  ) override;

    virtual void SAL_CALL seek( sal_Int64 location ) override;
    virtual sal_Int64 SAL_CALL getPosition(  ) override;
    virtual sal_Int64 SAL_CALL getLength(  ) override;
};

}   // namespace utl

#endif // _UNOTOOLS_STREAM_WRAPPER_HXX_

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