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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.
/* ====================================================================
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.hemf.usermodel;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Iterator;
import java.util.NoSuchElementException;
import javax.imageio.ImageIO;
import org.apache.poi.hemf.record.emf.HemfComment;
import org.apache.poi.hemf.record.emf.HemfComment.EmfComment;
import org.apache.poi.hemf.record.emf.HemfComment.EmfCommentDataFormat;
import org.apache.poi.hemf.record.emf.HemfComment.EmfCommentDataGeneric;
import org.apache.poi.hemf.record.emf.HemfComment.EmfCommentDataMultiformats;
import org.apache.poi.hemf.record.emf.HemfComment.EmfCommentDataPlus;
import org.apache.poi.hemf.record.emf.HemfComment.EmfCommentDataWMF;
import org.apache.poi.hemf.record.emf.HemfRecord;
import org.apache.poi.hemf.record.emfplus.HemfPlusImage.EmfPlusBitmapDataType;
import org.apache.poi.hemf.record.emfplus.HemfPlusImage.EmfPlusImage;
import org.apache.poi.hemf.record.emfplus.HemfPlusObject.EmfPlusObject;
import org.apache.poi.hemf.record.emfplus.HemfPlusObject.EmfPlusObjectType;
import org.apache.poi.hwmf.record.HwmfBitmapDib;
import org.apache.poi.hwmf.record.HwmfFill;
import org.apache.poi.hwmf.usermodel.HwmfEmbedded;
import org.apache.poi.hwmf.usermodel.HwmfEmbeddedType;
import org.apache.poi.poifs.filesystem.FileMagic;
import org.apache.poi.util.IOUtils;
public class HemfEmbeddedIterator implements Iterator {
//arbitrarily selected; may need to increase
private static final int MAX_RECORD_LENGTH = 100_000_000;
private final Deque> iterStack = new ArrayDeque<>();
private Object current;
public HemfEmbeddedIterator(HemfPicture emf) {
this(emf.getRecords().iterator());
}
public HemfEmbeddedIterator(Iterator recordIterator) {
iterStack.add(recordIterator);
}
@Override
public boolean hasNext() {
if (iterStack.isEmpty()) {
return false;
}
if (current != null) {
// don't search twice and potentially skip items
return true;
}
Iterator iter;
do {
iter = iterStack.peek();
while (iter.hasNext()) {
Object obj = iter.next();
if (obj instanceof EmfComment) {
HemfComment.EmfCommentData cd = ((EmfComment)obj).getCommentData();
if (
cd instanceof EmfCommentDataWMF ||
cd instanceof EmfCommentDataGeneric
) {
current = obj;
return true;
}
if (cd instanceof EmfCommentDataMultiformats) {
Iterator iter2 = ((EmfCommentDataMultiformats)cd).getFormats().iterator();
if (iter2.hasNext()) {
iterStack.push(iter2);
continue;
}
}
if (cd instanceof EmfCommentDataPlus) {
Iterator iter2 = ((EmfCommentDataPlus)cd).getRecords().iterator();
if (iter2.hasNext()) {
iter = iter2;
iterStack.push(iter2);
continue;
}
}
}
if (obj instanceof EmfCommentDataFormat) {
current = obj;
return true;
}
if (obj instanceof EmfPlusObject && ((EmfPlusObject)obj).getObjectType() == EmfPlusObjectType.IMAGE) {
current = obj;
return true;
}
if (obj instanceof HwmfFill.WmfStretchDib) {
HwmfBitmapDib bitmap = ((HwmfFill.WmfStretchDib) obj).getBitmap();
if (bitmap.isValid()) {
current = obj;
return true;
}
}
}
iterStack.pop();
} while (!iterStack.isEmpty());
return false;
}
@Override
public HwmfEmbedded next() {
HwmfEmbedded emb;
if ((emb = checkEmfCommentDataWMF()) != null) {
return emb;
}
if ((emb = checkEmfCommentDataGeneric()) != null) {
return emb;
}
if ((emb = checkEmfCommentDataFormat()) != null) {
return emb;
}
if ((emb = checkEmfPlusObject()) != null) {
return emb;
}
if ((emb = checkWmfStretchDib()) != null) {
return emb;
}
throw new NoSuchElementException("no further embedded wmf records found.");
}
private HwmfEmbedded checkEmfCommentDataWMF() {
if (!(current instanceof EmfComment && ((EmfComment)current).getCommentData() instanceof EmfCommentDataWMF)) {
return null;
}
EmfCommentDataWMF wmf = (EmfCommentDataWMF)((EmfComment)current).getCommentData();
HwmfEmbedded emb = new HwmfEmbedded();
emb.setEmbeddedType(HwmfEmbeddedType.WMF);
emb.setData(wmf.getWMFData());
current = null;
return emb;
}
private HwmfEmbedded checkEmfCommentDataGeneric() {
if (!(current instanceof EmfComment && ((EmfComment)current).getCommentData() instanceof EmfCommentDataGeneric)) {
return null;
}
EmfCommentDataGeneric cdg = (EmfCommentDataGeneric)((EmfComment)current).getCommentData();
HwmfEmbedded emb = new HwmfEmbedded();
emb.setEmbeddedType(HwmfEmbeddedType.UNKNOWN);
emb.setData(cdg.getPrivateData());
current = null;
return emb;
}
private HwmfEmbedded checkEmfCommentDataFormat() {
if (!(current instanceof EmfCommentDataFormat)) {
return null;
}
EmfCommentDataFormat cdf = (EmfCommentDataFormat)current;
HwmfEmbedded emb = new HwmfEmbedded();
boolean isEmf = (cdf.getSignature() == HemfComment.EmfFormatSignature.ENHMETA_SIGNATURE);
emb.setEmbeddedType(isEmf ? HwmfEmbeddedType.EMF : HwmfEmbeddedType.EPS);
emb.setData(cdf.getRawData());
current = null;
return emb;
}
private HwmfEmbedded checkWmfStretchDib() {
if (!(current instanceof HwmfFill.WmfStretchDib)) {
return null;
}
HwmfEmbedded emb = new HwmfEmbedded();
emb.setData(((HwmfFill.WmfStretchDib) current).getBitmap().getBMPData());
emb.setEmbeddedType(HwmfEmbeddedType.BMP);
current = null;
return emb;
}
private HwmfEmbedded checkEmfPlusObject() {
if (!(current instanceof EmfPlusObject)) {
return null;
}
EmfPlusObject epo = (EmfPlusObject)current;
assert(epo.getObjectType() == EmfPlusObjectType.IMAGE);
EmfPlusImage img = epo.getObjectData();
assert(img.getImageDataType() != null);
final HwmfEmbedded emb = getEmfPlusImageData();
if (emb == null) {
return null;
}
final HwmfEmbeddedType et;
switch (img.getImageDataType()) {
case BITMAP:
if (img.getBitmapType() == EmfPlusBitmapDataType.COMPRESSED) {
switch (FileMagic.valueOf(emb.getRawData())) {
case JPEG:
et = HwmfEmbeddedType.JPEG;
break;
case GIF:
et = HwmfEmbeddedType.GIF;
break;
case PNG:
et = HwmfEmbeddedType.PNG;
break;
case TIFF:
et = HwmfEmbeddedType.TIFF;
break;
default:
et = HwmfEmbeddedType.BITMAP;
break;
}
} else {
et = HwmfEmbeddedType.PNG;
compressGDIBitmap(img, emb, et);
}
break;
case METAFILE:
assert(img.getMetafileType() != null);
switch (img.getMetafileType()) {
case Wmf:
case WmfPlaceable:
et = HwmfEmbeddedType.WMF;
break;
case Emf:
case EmfPlusDual:
case EmfPlusOnly:
et = HwmfEmbeddedType.EMF;
break;
default:
et = HwmfEmbeddedType.UNKNOWN;
break;
}
break;
default:
et = HwmfEmbeddedType.UNKNOWN;
break;
}
emb.setEmbeddedType(et);
return emb;
}
/**
* Compress GDIs internal format to something useful
*/
private void compressGDIBitmap(EmfPlusImage img, HwmfEmbedded emb, HwmfEmbeddedType et) {
BufferedImage bi = img.readGDIImage(emb.getRawData());
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
// use HwmfEmbeddedType literal for conversion
ImageIO.write(bi, et.toString(), bos);
emb.setData(bos.toByteArray());
} catch (IOException e) {
// TODO: throw appropriate exception
throw new RuntimeException(e);
}
}
private HwmfEmbedded getEmfPlusImageData() {
EmfPlusObject epo = (EmfPlusObject)current;
assert(epo.getObjectType() == EmfPlusObjectType.IMAGE);
final int objectId = epo.getObjectId();
HwmfEmbedded emb = new HwmfEmbedded();
EmfPlusImage img = epo.getObjectData();
assert(img.getImageDataType() != null);
int totalSize = epo.getTotalObjectSize();
IOUtils.safelyAllocateCheck(totalSize, MAX_RECORD_LENGTH);
ByteArrayOutputStream bos = new ByteArrayOutputStream(epo.getTotalObjectSize());
try {
for (;;) {
bos.write(img.getImageData());
current = null;
//noinspection ConstantConditions
if (hasNext() &&
(current instanceof EmfPlusObject) &&
((epo = (EmfPlusObject) current).getObjectId() == objectId) &&
bos.size() < totalSize-16
) {
img = epo.getObjectData();
} else {
return emb;
}
}
} catch (IOException e) {
// ByteArrayOutputStream doesn't throw IOException
return null;
} finally {
emb.setData(bos.toByteArray());
}
}
}