    /* -*- 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/lang/XMultiServiceFactory.hpp>
    #include <com/sun/star/ucb/SimpleFileAccess.hpp>
    #include <com/sun/star/embed/ElementModes.hpp>
    #include <com/sun/star/embed/StorageFormats.hpp>
    #include <com/sun/star/beans/PropertyValue.hpp>
    #include <com/sun/star/io/IOException.hpp>
    #include <com/sun/star/io/TempFile.hpp>
    #include <com/sun/star/io/XSeekable.hpp>

    #include <comphelper/processfactory.hxx>
    #include <comphelper/storagehelper.hxx>
    #include <cppuhelper/supportsservice.hxx>
    #include <osl/diagnose.h>

    #include "xfactory.hxx"
    #include "xstorage.hxx"

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

    #if OSL_DEBUG_LEVEL > 0
    #define THROW_WHERE SAL_WHERE
    #else
    #define THROW_WHERE ""
    #endif

    bool CheckPackageSignature_Impl( const uno::Reference< io::XInputStream >& xInputStream,
                                         const uno::Reference< io::XSeekable >& xSeekable )
    {
        if ( !xInputStream.is() || !xSeekable.is() )
            throw uno::RuntimeException();

        if ( xSeekable->getLength() )
        {
            uno::Sequence< sal_Int8 > aData( 4 );
            xSeekable->seek( 0 );
            sal_Int32 nRead = xInputStream->readBytes( aData, 4 );
            xSeekable->seek( 0 );

            // TODO/LATER: should the disk spanned files be supported?
            // 0x50, 0x4b, 0x07, 0x08
            return ( nRead == 4 && aData[0] == 0x50 && aData[1] == 0x4b && aData[2] == 0x03 && aData[3] == 0x04 );
        }
        else
            return true; // allow to create a storage based on empty stream
    }

    uno::Sequence< OUString > OStorageFactory::impl_staticGetSupportedServiceNames()
    {
        uno::Sequence< OUString > aRet(2);
        aRet[0] = "com.sun.star.embed.StorageFactory";
        aRet[1] = "com.sun.star.comp.embed.StorageFactory";
        return aRet;
    }

    OUString OStorageFactory::impl_staticGetImplementationName()
    {
        return OUString("com.sun.star.comp.embed.StorageFactory");
    }

    uno::Reference< uno::XInterface > OStorageFactory::impl_staticCreateSelfInstance(
                const uno::Reference< lang::XMultiServiceFactory >& xServiceManager )
    {
        return uno::Reference< uno::XInterface >( *new OStorageFactory( comphelper::getComponentContext(xServiceManager) ) );
    }

    uno::Reference< uno::XInterface > SAL_CALL OStorageFactory::createInstance()
    {
        // TODO: reimplement TempStream service to support XStream interface
        uno::Reference < io::XStream > xTempStream(
                            io::TempFile::create(m_xContext),
                            uno::UNO_QUERY_THROW );

        return uno::Reference< uno::XInterface >(
                    static_cast< OWeakObject* >( new OStorage(  xTempStream,
                                                                embed::ElementModes::READWRITE,
                                                                uno::Sequence< beans::PropertyValue >(),
                                                                m_xContext,
                                                                embed::StorageFormats::PACKAGE ) ),
                    uno::UNO_QUERY );
    }

    uno::Reference< uno::XInterface > SAL_CALL OStorageFactory::createInstanceWithArguments(
                const uno::Sequence< uno::Any >& aArguments )
    {
        // The request for storage can be done with up to three arguments

        // The first argument specifies a source for the storage
        // it can be URL, XStream, XInputStream.
        // The second value is a mode the storage should be open in.
        // And the third value is a media descriptor.

        sal_Int32 nArgNum = aArguments.getLength();
        OSL_ENSURE( nArgNum < 4, "Wrong parameter number" );

        if ( !nArgNum )
            return createInstance();

        // first try to retrieve storage open mode if any
        // by default the storage will be open in readonly mode
        sal_Int32 nStorageMode = embed::ElementModes::READ;
        if ( nArgNum >= 2 )
        {
            if( !( aArguments[1] >>= nStorageMode ) )
            {
                OSL_FAIL( "Wrong second argument!" );
                throw lang::IllegalArgumentException(); // TODO:
            }
            // it's always possible to read written storage in this implementation
            nStorageMode |= embed::ElementModes::READ;
        }

        if ( ( nStorageMode & embed::ElementModes::TRUNCATE ) == embed::ElementModes::TRUNCATE
          && ( nStorageMode & embed::ElementModes::WRITE ) != embed::ElementModes::WRITE )
            throw lang::IllegalArgumentException(); // TODO:

        // retrieve storage source stream
        OUString aURL;
        uno::Reference< io::XStream > xStream;
        uno::Reference< io::XInputStream > xInputStream;

        if ( aArguments[0] >>= aURL )
        {
            if ( aURL.isEmpty() )
            {
                OSL_FAIL( "Empty URL is provided!" );
                throw lang::IllegalArgumentException(); // TODO:
            }

            if ( aURL.startsWithIgnoreAsciiCase("vnd.sun.star.pkg:") )
            {
                OSL_FAIL( "Packages URL's are not valid for storages!" ); // ???
                throw lang::IllegalArgumentException(); // TODO:
            }

            uno::Reference < ucb::XSimpleFileAccess3 > xTempAccess(
                ucb::SimpleFileAccess::create(
                    m_xContext ) );

            if ( nStorageMode & embed::ElementModes::WRITE )
                xStream = xTempAccess->openFileReadWrite( aURL );
            else
                xInputStream = xTempAccess->openFileRead( aURL );
        }
        else if ( !( aArguments[0] >>= xStream ) && !( aArguments[0] >>= xInputStream ) )
        {
            OSL_FAIL( "Wrong first argument!" );
            throw uno::Exception("wrong first arg", nullptr); // TODO: Illegal argument
        }

        // retrieve mediadescriptor and set storage properties
        uno::Sequence< beans::PropertyValue > aDescr;
        uno::Sequence< beans::PropertyValue > aPropsToSet;

        sal_Int32 nStorageType = embed::StorageFormats::PACKAGE;

        if ( nArgNum >= 3 )
        {
            if( aArguments[2] >>= aDescr )
            {
                if ( !aURL.isEmpty() )
                {
                    aPropsToSet.realloc(1);
                    aPropsToSet[0].Name = "URL";
                    aPropsToSet[0].Value <<= aURL;
                }

                for ( sal_Int32 nInd = 0, nNumArgs = 1; nInd < aDescr.getLength(); nInd++ )
                {
                    if ( aDescr[nInd].Name == "InteractionHandler"
                      || aDescr[nInd].Name == "Password"
                      || aDescr[nInd].Name == "RepairPackage"
                      || aDescr[nInd].Name == "StatusIndicator" )
                    {
                        aPropsToSet.realloc( ++nNumArgs );
                        aPropsToSet[nNumArgs-1].Name = aDescr[nInd].Name;
                        aPropsToSet[nNumArgs-1].Value = aDescr[nInd].Value;
                    }
                    else if ( aDescr[nInd].Name == "StorageFormat" )
                    {
                        OUString aFormatName;
                        sal_Int32 nFormatID = 0;
                        if ( aDescr[nInd].Value >>= aFormatName )
                        {
                            if ( aFormatName == PACKAGE_STORAGE_FORMAT_STRING )
                                nStorageType = embed::StorageFormats::PACKAGE;
                            else if ( aFormatName == ZIP_STORAGE_FORMAT_STRING )
                                nStorageType = embed::StorageFormats::ZIP;
                            else if ( aFormatName == OFOPXML_STORAGE_FORMAT_STRING )
                                nStorageType = embed::StorageFormats::OFOPXML;
                            else
                                throw lang::IllegalArgumentException( THROW_WHERE, uno::Reference< uno::XInterface >(), 1 );
                        }
                        else if ( aDescr[nInd].Value >>= nFormatID )
                        {
                            if ( nFormatID != embed::StorageFormats::PACKAGE
                              && nFormatID != embed::StorageFormats::ZIP
                              && nFormatID != embed::StorageFormats::OFOPXML )
                                throw lang::IllegalArgumentException( THROW_WHERE, uno::Reference< uno::XInterface >(), 1 );

                            nStorageType = nFormatID;
                        }
                        else
                            throw lang::IllegalArgumentException( THROW_WHERE, uno::Reference< uno::XInterface >(), 1 );
                    }
                    else if (aDescr[nInd].Name == "NoFileSync")
                    {
                        // Forward NoFileSync to the storage.
                        aPropsToSet.realloc(++nNumArgs);
                        aPropsToSet[nNumArgs - 1].Name = aDescr[nInd].Name;
                        aPropsToSet[nNumArgs - 1].Value = aDescr[nInd].Value;
                    }
                    else
                        OSL_FAIL( "Unacceptable property, will be ignored!" );
                }
            }
            else
            {
                OSL_FAIL( "Wrong third argument!" );
                throw uno::Exception("wrong 3rd arg", nullptr); // TODO: Illegal argument
            }

        }

        // create storage based on source
        if ( xInputStream.is() )
        {
            // if xInputStream is set the storage should be open from it
            if ( nStorageMode & embed::ElementModes::WRITE )
                  throw uno::Exception("storagemode==write", nullptr); // TODO: access denied

            uno::Reference< io::XSeekable > xSeekable( xInputStream, uno::UNO_QUERY );
            if ( !xSeekable.is() )
            {
                // TODO: wrap stream to let it be seekable
                OSL_FAIL( "Nonseekable streams are not supported for now!" );
            }

            if ( !CheckPackageSignature_Impl( xInputStream, xSeekable ) )
                throw io::IOException(); // TODO: this is not a package file

            return uno::Reference< uno::XInterface >(
                        static_cast< OWeakObject* >( new OStorage( xInputStream, nStorageMode, aPropsToSet, m_xContext, nStorageType ) ),
                        uno::UNO_QUERY );
        }
        else if ( xStream.is() )
        {
            if ( ( ( nStorageMode & embed::ElementModes::WRITE ) && !xStream->getOutputStream().is() )
                 || !xStream->getInputStream().is() )
                  throw uno::Exception("access denied", nullptr); // TODO: access denied

            uno::Reference< io::XSeekable > xSeekable( xStream, uno::UNO_QUERY );
            if ( !xSeekable.is() )
            {
                // TODO: wrap stream to let it be seekable
                OSL_FAIL( "Nonseekable streams are not supported for now!" );
            }

            if ( !CheckPackageSignature_Impl( xStream->getInputStream(), xSeekable ) )
                throw io::IOException(); // TODO: this is not a package file

            return uno::Reference< uno::XInterface >(
                        static_cast< OWeakObject* >( new OStorage( xStream, nStorageMode, aPropsToSet, m_xContext, nStorageType ) ),
                        uno::UNO_QUERY );
        }

        throw uno::Exception("no input stream or regular stream", nullptr); // general error during creation
    }

    OUString SAL_CALL OStorageFactory::getImplementationName()
    {
        return impl_staticGetImplementationName();
    }

    sal_Bool SAL_CALL OStorageFactory::supportsService( const OUString& ServiceName )
    {
        return cppu::supportsService(this, ServiceName);
    }

    uno::Sequence< OUString > SAL_CALL OStorageFactory::getSupportedServiceNames()
    {
        return impl_staticGetSupportedServiceNames();
    }

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

↑ V572 It is odd that the object which was created using 'new' operator is immediately cast to another type.

↑ V572 It is odd that the object which was created using 'new' operator is immediately cast to another type.

↑ V572 It is odd that the object which was created using 'new' operator is immediately cast to another type.

↑ V1019 Compound assignment expression 'aArguments[0] >>= xInputStream' is used inside condition.