/* -*- 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/log.hxx>

#include <tools/stream.hxx>

#include <tools/vcompat.hxx>

#include <utility>

#include <vcl/graph.hxx>

#include <vcl/gfxlink.hxx>

#include <vcl/graphicfilter.hxx>

#include <memory>

#include <o3tl/hash_combine.hxx>

GfxLink::GfxLink()

    : meType(GfxLinkType::NONE)

    , mnUserId(0)

    , maHash(0)

    , mbPrefMapModeValid(false)

    , mbPrefSizeValid(false)

{

}

GfxLink::GfxLink(BinaryDataContainer aDataConainer, GfxLinkType nType)

    : meType(nType)

    , mnUserId(0)

    , maDataContainer(std::move(aDataConainer))

    , maHash(0)

    , mbPrefMapModeValid(false)

    , mbPrefSizeValid(false)

{

}

size_t GfxLink::GetHash() const

{

    if (!maHash)

    {

        std::size_t seed = maDataContainer.calculateHash();

        o3tl::hash_combine(seed, meType);

        maHash = seed;

    }

    return maHash;

}

bool GfxLink::operator==( const GfxLink& rGfxLink ) const

{

    if (GetDataSize() != rGfxLink.GetDataSize()

        || meType != rGfxLink.meType

        || GetHash() != rGfxLink.GetHash())

        return false;

    const sal_uInt8* pSource = GetData();

    const sal_uInt8* pDestination = rGfxLink.GetData();

    if (pSource == pDestination)

        return true;

    sal_uInt32 nSourceSize = GetDataSize();

    sal_uInt32 nDestSize = rGfxLink.GetDataSize();

    if (pSource && pDestination && (nSourceSize == nDestSize))

        return memcmp(pSource, pDestination, nSourceSize) == 0;

    return false;

}

bool GfxLink::IsNative() const

{

    return meType >= GfxLinkType::NativeFirst && meType <= GfxLinkType::NativeLast;

}

const sal_uInt8* GfxLink::GetData() const

{

    return maDataContainer.getData();

}

void GfxLink::SetPrefSize( const Size& rPrefSize )

{

    maPrefSize = rPrefSize;

    mbPrefSizeValid = true;

}

void GfxLink::SetPrefMapMode( const MapMode& rPrefMapMode )

{

    maPrefMapMode = rPrefMapMode;

    mbPrefMapModeValid = true;

}

bool GfxLink::LoadNative(Graphic& rGraphic, sal_Int32 nPageNum) const

{

    bool bRet = false;

    if (IsNative() && !maDataContainer.isEmpty())

    {

        const sal_uInt8* pData = GetData();

        if (pData)

        {

            SvMemoryStream aMemoryStream(const_cast<sal_uInt8*>(pData), GetDataSize(), StreamMode::READ | StreamMode::WRITE);

            OUString aShortName;

            switch (meType)

            {

                case GfxLinkType::NativeGif: aShortName = GIF_SHORTNAME; break;

                case GfxLinkType::NativeJpg: aShortName = JPG_SHORTNAME; break;

                case GfxLinkType::NativePng: aShortName = PNG_SHORTNAME; break;

                case GfxLinkType::NativeTif: aShortName = TIF_SHORTNAME; break;

                case GfxLinkType::NativeWmf: aShortName = WMF_SHORTNAME; break;

                case GfxLinkType::NativeMet: aShortName = MET_SHORTNAME; break;

                case GfxLinkType::NativePct: aShortName = PCT_SHORTNAME; break;

                case GfxLinkType::NativeSvg: aShortName = SVG_SHORTNAME; break;

                case GfxLinkType::NativeBmp: aShortName = BMP_SHORTNAME; break;

                case GfxLinkType::NativePdf: aShortName = PDF_SHORTNAME; break;

                case GfxLinkType::NativeWebp: aShortName = WEBP_SHORTNAME; break;

                default: break;

            }

            if (!aShortName.isEmpty())

            {

                GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();

                sal_uInt16 nFormat = rFilter.GetImportFormatNumberForShortName(aShortName);

                ErrCode nResult

                    = rFilter.ImportGraphic(rGraphic, u"", aMemoryStream, nFormat, nullptr,

                                            GraphicFilterImportFlags::NONE, nPageNum);

                if (nResult == ERRCODE_NONE)

                    bRet = true;

            }

        }

    }

    return bRet;

}

bool GfxLink::ExportNative( SvStream& rOStream ) const

{

    if( GetDataSize() )

    {

        auto pData = GetData();

        if (pData)

            rOStream.WriteBytes(pData, GetDataSize());

    }

    return ( rOStream.GetError() == ERRCODE_NONE );

}

bool GfxLink::IsEMF() const

{

    const sal_uInt8* pGraphicAry = GetData();

    if ((GetType() == GfxLinkType::NativeWmf) && pGraphicAry && (GetDataSize() > 0x2c))

    {

        // check the magic number

        if ((pGraphicAry[0x28] == 0x20) && (pGraphicAry[0x29] == 0x45)

            && (pGraphicAry[0x2a] == 0x4d) && (pGraphicAry[0x2b] == 0x46))

        {

            //emf detected

            return true;

        }

    }

    return false;

}

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