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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/* ====================================================================
   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

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */
package org.apache.poi.xssf.binary;

import org.apache.poi.util.Internal;

/**
 * @since 3.16-beta3
 */
@Internal
class XSSFBHeaderFooters {

    public static XSSFBHeaderFooters parse(byte[] data) {
        //parse these at some point.
        boolean diffOddEven = false;
        boolean diffFirst = false;
        boolean scaleWDoc = false;
        boolean alignMargins = false;

        int offset = 2;
        XSSFBHeaderFooters xssfbHeaderFooter = new XSSFBHeaderFooters();
        xssfbHeaderFooter.header = new XSSFBHeaderFooter("header", true);
        xssfbHeaderFooter.footer = new XSSFBHeaderFooter("footer", false);
        xssfbHeaderFooter.headerEven = new XSSFBHeaderFooter("evenHeader", true);
        xssfbHeaderFooter.footerEven = new XSSFBHeaderFooter("evenFooter", false);
        xssfbHeaderFooter.headerFirst = new XSSFBHeaderFooter("firstHeader", true);
        xssfbHeaderFooter.footerFirst = new XSSFBHeaderFooter("firstFooter", false);
        offset += readHeaderFooter(data, offset, xssfbHeaderFooter.header);
        offset += readHeaderFooter(data, offset, xssfbHeaderFooter.footer);
        offset += readHeaderFooter(data, offset, xssfbHeaderFooter.headerEven);
        offset += readHeaderFooter(data, offset, xssfbHeaderFooter.footerEven);
        offset += readHeaderFooter(data, offset, xssfbHeaderFooter.headerFirst);
        readHeaderFooter(data, offset, xssfbHeaderFooter.footerFirst);
        return xssfbHeaderFooter;
    }

    private static int readHeaderFooter(byte[] data, int offset, XSSFBHeaderFooter headerFooter) {
        if (offset + 4 >= data.length) {
            return 0;
        }
        StringBuilder sb = new StringBuilder();
        int bytesRead = XSSFBUtils.readXLNullableWideString(data, offset, sb);
        headerFooter.setRawString(sb.toString());
        return bytesRead;
    }

    private XSSFBHeaderFooter header;
    private XSSFBHeaderFooter footer;
    private XSSFBHeaderFooter headerEven;
    private XSSFBHeaderFooter footerEven;
    private XSSFBHeaderFooter headerFirst;
    private XSSFBHeaderFooter footerFirst;

    public XSSFBHeaderFooter getHeader() {
        return header;
    }

    public XSSFBHeaderFooter getFooter() {
        return footer;
    }

    public XSSFBHeaderFooter getHeaderEven() {
        return headerEven;
    }

    public XSSFBHeaderFooter getFooterEven() {
        return footerEven;
    }

    public XSSFBHeaderFooter getHeaderFirst() {
        return headerFirst;
    }

    public XSSFBHeaderFooter getFooterFirst() {
        return footerFirst;
    }
}