/* -*- 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 .

 */

#pragma once

#include <sal/config.h>

#include <memory>

#include <sal/types.h>

#include <rtl/string.hxx>

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

namespace sax_expatwrap {

class Text2UnicodeConverter

{

public:

    Text2UnicodeConverter( const OString & sEncoding );

    ~Text2UnicodeConverter();

    css::uno::Sequence < sal_Unicode > convert( const css::uno::Sequence<sal_Int8> & );

    bool canContinue() const { return m_bCanContinue; }

private:

    void init( rtl_TextEncoding encoding );

    rtl_TextToUnicodeConverter   m_convText2Unicode;

    rtl_TextToUnicodeContext     m_contextText2Unicode;

    bool                         m_bCanContinue;

    bool                         m_bInitialized;

    css::uno::Sequence<sal_Int8> m_seqSource;

};

/*----------------------------------------

*

* Unicode2TextConverter

*

**-----------------------------------------*/

class Unicode2TextConverter

{

public:

    Unicode2TextConverter( rtl_TextEncoding encoding );

    ~Unicode2TextConverter();

    css::uno::Sequence<sal_Int8> convert( const sal_Unicode * , sal_Int32 nLength );

private:

    rtl_UnicodeToTextConverter      m_convUnicode2Text;

    rtl_UnicodeToTextContext        m_contextUnicode2Text;

    css::uno::Sequence<sal_Unicode> m_seqSource;

};

/*----------------------------------------

*

* XMLFile2UTFConverter

*

**-----------------------------------------*/

class XMLFile2UTFConverter

{

public:

    XMLFile2UTFConverter( ):

        m_bStarted( false )

        {}

    void setInputStream( css::uno::Reference< css::io::XInputStream > const &r ) { m_in = r; }

    void setEncoding( const OString &s ) { m_sEncoding = s; }

    // @param nMaxToRead The number of chars, that should be read. Note that this is no exact number. There

    //                   may be returned less or more bytes than ordered.

    /// @throws css::io::IOException

    /// @throws css::io::NotConnectedException

    /// @throws css::io::BufferSizeExceededException

    /// @throws css::uno::RuntimeException

    sal_Int32 readAndConvert( css::uno::Sequence<sal_Int8> &seq , sal_Int32 nMaxToRead );

private:

    // Called only on first Sequence of bytes. Tries to figure out file format and encoding information.

    // @return TRUE, when encoding information could be retrieved

    // @return FALSE, when no encoding information was found in file

    bool scanForEncoding( css::uno::Sequence<sal_Int8> &seq );

    // Called only on first Sequence of bytes. Tries to figure out

    // if enough data is available to scan encoding

    // @return TRUE, when encoding is retrievable

    // @return FALSE, when more data is needed

    static bool isEncodingRecognizable( const css::uno::Sequence< sal_Int8 > & seq );

    // When encoding attribute is within the text (in the first line), it is removed.

    static void removeEncoding( css::uno::Sequence<sal_Int8> &seq );

    // Initializes decoding depending on m_sEncoding setting

    void initializeDecoding();

private:

    css::uno::Reference< css::io::XInputStream >  m_in;

    bool m_bStarted;

    OString m_sEncoding;

    std::unique_ptr<Text2UnicodeConverter> m_pText2Unicode;

    std::unique_ptr<Unicode2TextConverter> m_pUnicode2Text;

};

}

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