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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.hwmf.usermodel;
-
- import java.io.IOException;
- import java.util.ArrayDeque;
- import java.util.Deque;
- import java.util.Iterator;
- import java.util.NoSuchElementException;
-
- import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
- import org.apache.poi.hwmf.record.HwmfEscape;
- import org.apache.poi.hwmf.record.HwmfEscape.EscapeFunction;
- import org.apache.poi.hwmf.record.HwmfEscape.WmfEscapeEMF;
- import org.apache.poi.hwmf.record.HwmfFill.HwmfImageRecord;
- import org.apache.poi.hwmf.record.HwmfRecord;
-
- public class HwmfEmbeddedIterator implements Iterator<HwmfEmbedded> {
-
- private final Deque<Iterator<?>> iterStack = new ArrayDeque<>();
- private Object current;
-
- public HwmfEmbeddedIterator(HwmfPicture wmf) {
- this(wmf.getRecords().iterator());
- }
-
- public HwmfEmbeddedIterator(Iterator<HwmfRecord> 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 HwmfImageRecord) {
- current = obj;
- return true;
- }
- if (obj instanceof HwmfEscape && ((HwmfEscape)obj).getEscapeFunction() == EscapeFunction.META_ESCAPE_ENHANCED_METAFILE) {
- WmfEscapeEMF emfData = ((HwmfEscape)obj).getEscapeData();
- if (emfData.isValid()) {
- current = obj;
- return true;
- }
- }
- }
- iterStack.pop();
- } while (!iterStack.isEmpty());
-
- return false;
- }
-
- @Override
- public HwmfEmbedded next() {
- HwmfEmbedded emb;
- if ((emb = checkHwmfImageRecord()) != null) {
- return emb;
- }
- if ((emb = checkHwmfEscapeRecord()) != null) {
- return emb;
- }
-
- throw new NoSuchElementException("no further embedded emf records found.");
- }
-
- private HwmfEmbedded checkHwmfImageRecord() {
- if (!(current instanceof HwmfImageRecord)) {
- return null;
- }
-
- HwmfImageRecord hir = (HwmfImageRecord)current;
- current = null;
-
- HwmfEmbedded emb = new HwmfEmbedded();
- emb.setEmbeddedType(HwmfEmbeddedType.BMP);
- emb.setData(hir.getBMPData());
-
- return emb;
- }
-
-
- private HwmfEmbedded checkHwmfEscapeRecord() {
- if (!(current instanceof HwmfEscape)) {
- return null;
- }
-
- final HwmfEmbedded emb = new HwmfEmbedded();
- emb.setEmbeddedType(HwmfEmbeddedType.EMF);
-
- try (UnsynchronizedByteArrayOutputStream bos = new UnsynchronizedByteArrayOutputStream()) {
- WmfEscapeEMF img;
- do {
- final HwmfEscape esc = (HwmfEscape)current;
- assert(esc.getEscapeFunction() == EscapeFunction.META_ESCAPE_ENHANCED_METAFILE);
-
- img = esc.getEscapeData();
- assert(img.isValid());
-
- bos.write(img.getEmfData());
- current = null;
- } while (img.getRemainingBytes() > 0 && hasNext() && (current instanceof HwmfEscape));
-
- emb.setData(bos.toByteArray());
- return emb;
-
- } catch (IOException ignored) {
- // UnsynchronizedByteArrayOutputStream doesn't throw IOException
- return null;
- }
- }
- }
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