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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.usermodel;

import java.io.IOException;

import org.apache.poi.ooxml.POIXMLDocumentPart;
import org.apache.poi.ooxml.POIXMLException;
import org.apache.poi.ooxml.POIXMLRelation;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.ss.usermodel.PictureData;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.util.IOUtils;

/**
 * Raw picture data, normally attached to a SpreadsheetML Drawing.
 * As a rule, pictures are stored in the /xl/media/ part of a SpreadsheetML package.
 */
public class XSSFPictureData extends POIXMLDocumentPart implements PictureData {

    /**
     * Relationships for each known picture type
     */
    protected static final POIXMLRelation[] RELATIONS;
    static {
        RELATIONS = new POIXMLRelation[13];
        RELATIONS[Workbook.PICTURE_TYPE_EMF] = XSSFRelation.IMAGE_EMF;
        RELATIONS[Workbook.PICTURE_TYPE_WMF] = XSSFRelation.IMAGE_WMF;
        RELATIONS[Workbook.PICTURE_TYPE_PICT] = XSSFRelation.IMAGE_PICT;
        RELATIONS[Workbook.PICTURE_TYPE_JPEG] = XSSFRelation.IMAGE_JPEG;
        RELATIONS[Workbook.PICTURE_TYPE_PNG] = XSSFRelation.IMAGE_PNG;
        RELATIONS[Workbook.PICTURE_TYPE_DIB] = XSSFRelation.IMAGE_DIB;
        RELATIONS[XSSFWorkbook.PICTURE_TYPE_GIF] = XSSFRelation.IMAGE_GIF;
        RELATIONS[XSSFWorkbook.PICTURE_TYPE_TIFF] = XSSFRelation.IMAGE_TIFF;
        RELATIONS[XSSFWorkbook.PICTURE_TYPE_EPS] = XSSFRelation.IMAGE_EPS;
        RELATIONS[XSSFWorkbook.PICTURE_TYPE_BMP] = XSSFRelation.IMAGE_BMP;
        RELATIONS[XSSFWorkbook.PICTURE_TYPE_WPG] = XSSFRelation.IMAGE_WPG;
    }

    /**
     * Create a new XSSFPictureData node
     *
     * @see org.apache.poi.xssf.usermodel.XSSFWorkbook#addPicture(byte[], int)
     */
    protected XSSFPictureData() {
        super();
    }

    /**
     * Construct XSSFPictureData from a package part
     *
     * @param part the package part holding the drawing data,
     * 
     * @since POI 3.14-Beta1
     */
    protected XSSFPictureData(PackagePart part) {
        super(part);
    }
    
    /**
     * Gets the picture data as a byte array.
     * 
     * Note, that this call might be expensive since all the picture data is copied into a temporary byte array.
     * You can grab the picture data directly from the underlying package part as follows:
     * 

     * 
     * InputStream is = getPackagePart().getInputStream();
     * 
     * 
     *
     * @return the picture data.
     */
    public byte[] getData() {
        try {
            return IOUtils.toByteArray(getPackagePart().getInputStream());
        } catch(IOException e) {
            throw new POIXMLException(e);
        }
    }

    /**
     * Suggests a file extension for this image.
     *
     * @return the file extension.
     */
    public String suggestFileExtension() {
        return getPackagePart().getPartName().getExtension();
    }

    /**
     * Return an integer constant that specifies type of this picture
     *
     * @return an integer constant that specifies type of this picture 
     * @see org.apache.poi.ss.usermodel.Workbook#PICTURE_TYPE_EMF
     * @see org.apache.poi.ss.usermodel.Workbook#PICTURE_TYPE_WMF
     * @see org.apache.poi.ss.usermodel.Workbook#PICTURE_TYPE_PICT
     * @see org.apache.poi.ss.usermodel.Workbook#PICTURE_TYPE_JPEG
     * @see org.apache.poi.ss.usermodel.Workbook#PICTURE_TYPE_PNG
     * @see org.apache.poi.ss.usermodel.Workbook#PICTURE_TYPE_DIB
     */
    public int getPictureType(){
        String contentType = getPackagePart().getContentType();
        for (int i = 0; i < RELATIONS.length; i++) {
            if(RELATIONS[i] == null) continue;

            if(RELATIONS[i].getContentType().equals(contentType)){
                return i;
            }
        }
        return 0;
    }

    public String getMimeType() {
        return getPackagePart().getContentType();
    }

    /**
     * *PictureData objects store the actual content in the part directly without keeping a 
     * copy like all others therefore we need to handle them differently.
     */
    @Override
    protected void prepareForCommit() {
        // do not clear the part here
    }
}