/*

* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Implements ODTInputStream

 *

*/

package com.nokia.tools.themeinstaller.odtconverter;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.Enumeration;

/**

 * Implements ODTInputStream

 */

public class ODTInputStream extends InputStream

    {

    /** ODTDocument */

    ODTDocument iODTDocument;

    /** ByteArrayOutputStream for binary representations */

    ByteArrayOutputStream iBaos;

    /** ODTDataOutputStream for writing data to stream */

    ODTDataOutputStream iODTDos;

    /** byte array for read */

    byte[] iByteArray = null;

    /** index for reading byte array */

    int iIndex = 0;

    /* Literal delimiter is used in separation of theme header and

    other data in ODT-streaming. */

    private static final char DELIM = '#';

    // Symbian CDirectFileStore needs these

    private static final int WRITE_ONCE_FILE_STORE_UID = 268435511;

    private static final int UNKNOWN_MEDIA_UID = 73066445;

   /**

    * Constructor

    * @param aODTDocument

    * @throws ODTException

    */

    public ODTInputStream( ODTDocument aODTDocument ) throws ODTException

        {

        iODTDocument = aODTDocument;

        iBaos = new ByteArrayOutputStream();

        iODTDos = new ODTDataOutputStream( iBaos );

        getBinaryRepresentations();

        }

    /**

     * gets binary representations of ODTHeader, ODTResources and DOMDocument

     * @throws ODTException

     */

    private void getBinaryRepresentations() throws ODTException

        {

        // first write stuff needed by Symbian CDirectFileStore, then

        // get and write ODT material

        try

            {

            // write first uid

            iODTDos.writeInt32( WRITE_ONCE_FILE_STORE_UID );

            // write two 0, for keeping stream valid in native side

            iODTDos.writeInt( 0 );

            iODTDos.writeInt( 0 );

            // write second uid

            iODTDos.writeInt32( UNKNOWN_MEDIA_UID );

            // write index where ODT header starts

            iODTDos.writeInt32( 20 );

            // get and write ODT header

            iBaos.write( iODTDocument.getODTHeader().getBinaryODTHeader() );

            // write delimiter

            iODTDos.writeInt16( DELIM );

            // write resource count

            int resCount = iODTDocument.getODTResources().size();

            iODTDos.writeInt32( resCount );

            // get and write ODTResources

            for ( Enumeration resources = iODTDocument.getODTResources()

                    .elements(); resources.hasMoreElements(); )

                {

                ODTResource odtResource = ( ODTResource ) resources

                        .nextElement();

                iBaos.write( odtResource.getBinaryODTResource() );

                }

            // get and write DOMDocument

            DOMExternalizer domExt =

                          new DOMExternalizer( iODTDocument.getDOMDocument() );

            iBaos.write( domExt.getByteArray() );

            }

        catch( IOException e )

            {

            throw new ODTException( e.getMessage() );

            }

        }

    /* (non-Javadoc)

     * @see java.io.InputStream#close()

     */

    public void close() throws IOException

        {

        iODTDos.close();

        iBaos.close();

        }

    /* (non-Javadoc)

     * @see java.io.InputStream#read()

     */

    public int read() throws IOException

        {

        if( iByteArray == null )

            {

            iByteArray = iBaos.toByteArray();

            }

        if( iIndex >= iByteArray.length )

            {

            iByteArray = null;

            return -1;

            }

        byte b = iByteArray[iIndex++];

        // because 0xff byte is -1, which is used as end of stream value,

        // we must return 0xff int which is 255.

        if( b == (byte)0xff )

            {

            return 0xff;

            }

        return b;

        }

    }