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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.xslf.util;

import java.awt.Graphics2D;
import java.awt.geom.Dimension2D;
import java.awt.geom.Rectangle2D;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Collections;

import org.apache.poi.common.usermodel.GenericRecord;
import org.apache.poi.sl.draw.BitmapImageRenderer;
import org.apache.poi.sl.draw.DrawPictureShape;
import org.apache.poi.sl.draw.EmbeddedExtractor;
import org.apache.poi.sl.draw.EmbeddedExtractor.EmbeddedPart;
import org.apache.poi.sl.draw.ImageRenderer;
import org.apache.poi.sl.usermodel.PictureData;
import org.apache.poi.util.Internal;

@Internal
class EMFHandler extends MFProxy {
    private ImageRenderer imgr = null;
    private InputStream is;

    @Override
    public void parse(File file) throws IOException {
        // stream needs to be kept open until the instance is closed
        is = file.toURI().toURL().openStream();
        parse(is);
    }

    @Override
    public void parse(InputStream is) throws IOException {
        imgr = DrawPictureShape.getImageRenderer(null, getContentType());
        if (imgr instanceof BitmapImageRenderer) {
            throw new PPTX2PNG.NoScratchpadException();
        }

        // stream needs to be kept open
        imgr.loadImage(is, getContentType());

        if (ignoreParse) {
            try {
                imgr.getDimension();
            } catch (Exception e) {
//                if (!quite) {
//                    e.printStackTrace(System.err);
//                }
            }
        }
    }

    protected String getContentType() {
        return PictureData.PictureType.EMF.contentType;
    }

    @Override
    public Dimension2D getSize() {
        return imgr.getDimension();
    }

    @Override
    public String getTitle() {
        return "";
    }

    @Override
    public void draw(Graphics2D ctx) {
        Dimension2D dim = getSize();
        imgr.drawImage(ctx, new Rectangle2D.Double(0, 0, dim.getWidth(), dim.getHeight()));
    }

    @Override
    public void close() throws IOException {
        if (is != null) {
            try {
                is.close();
            } finally {
                is = null;
            }
        }
    }

    @Override
    public GenericRecord getRoot() {
        return imgr.getGenericRecord();
    }

    @Override
    public Iterable getEmbeddings(int slideNo) {
        return (imgr instanceof EmbeddedExtractor)
            ? ((EmbeddedExtractor) imgr).getEmbeddings()
            : Collections.emptyList();
    }

    @Override
    void setDefaultCharset(Charset charset) {
        imgr.setDefaultCharset(charset);
    }
}