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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.awt.Dimension;
- import java.awt.Graphics2D;
- import java.awt.geom.AffineTransform;
- import java.awt.geom.Rectangle2D;
- import java.io.BufferedInputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.util.ArrayList;
- import java.util.Collections;
- import java.util.List;
-
- import org.apache.poi.hwmf.draw.HwmfGraphics;
- import org.apache.poi.hwmf.record.HwmfHeader;
- import org.apache.poi.hwmf.record.HwmfPlaceableHeader;
- import org.apache.poi.hwmf.record.HwmfRecord;
- import org.apache.poi.hwmf.record.HwmfRecordType;
- import org.apache.poi.hwmf.record.HwmfWindowing.WmfSetWindowExt;
- import org.apache.poi.hwmf.record.HwmfWindowing.WmfSetWindowOrg;
- import org.apache.poi.util.IOUtils;
- import org.apache.poi.util.LittleEndianInputStream;
- import org.apache.poi.util.POILogFactory;
- import org.apache.poi.util.POILogger;
- import org.apache.poi.util.RecordFormatException;
- import org.apache.poi.util.Units;
-
- public class HwmfPicture {
- /** Max. record length - processing longer records will throw an exception */
- public static final int MAX_RECORD_LENGTH = 50_000_000;
-
- private static final POILogger logger = POILogFactory.getLogger(HwmfPicture.class);
-
- final List<HwmfRecord> records = new ArrayList<>();
- final HwmfPlaceableHeader placeableHeader;
- final HwmfHeader header;
-
- public HwmfPicture(InputStream inputStream) throws IOException {
-
- try (LittleEndianInputStream leis = new LittleEndianInputStream(inputStream)) {
- placeableHeader = HwmfPlaceableHeader.readHeader(leis);
- header = new HwmfHeader(leis);
-
- for (;;) {
- long recordSize;
- int recordFunction;
- try {
- // recordSize in DWORDs
- long recordSizeLong = leis.readUInt()*2;
- if (recordSizeLong > Integer.MAX_VALUE) {
- throw new RecordFormatException("record size can't be > "+Integer.MAX_VALUE);
- } else if (recordSizeLong < 0L) {
- throw new RecordFormatException("record size can't be < 0");
- }
- recordSize = (int)recordSizeLong;
- recordFunction = leis.readShort();
- } catch (Exception e) {
- logger.log(POILogger.ERROR, "unexpected eof - wmf file was truncated");
- break;
- }
- // 4 bytes (recordSize) + 2 bytes (recordFunction)
- int consumedSize = 6;
- HwmfRecordType wrt = HwmfRecordType.getById(recordFunction);
- if (wrt == null) {
- throw new IOException("unexpected record type: "+recordFunction);
- }
- if (wrt == HwmfRecordType.eof) {
- break;
- }
- if (wrt.constructor == null) {
- throw new IOException("unsupported record type: "+recordFunction);
- }
-
- final HwmfRecord wr = wrt.constructor.get();
- records.add(wr);
-
- consumedSize += wr.init(leis, recordSize, recordFunction);
- int remainingSize = (int)(recordSize - consumedSize);
- if (remainingSize < 0) {
- throw new RecordFormatException("read too many bytes. record size: "+recordSize + "; comsumed size: "+consumedSize);
- } else if(remainingSize > 0) {
- long skipped = IOUtils.skipFully(leis, remainingSize);
- if (skipped != (long)remainingSize) {
- throw new RecordFormatException("Tried to skip "+remainingSize + " but skipped: "+skipped);
- }
- }
- }
- }
- }
-
- public List<HwmfRecord> getRecords() {
- return Collections.unmodifiableList(records);
- }
-
- public void draw(Graphics2D ctx) {
- Dimension dim = getSize();
- int width = Units.pointsToPixel(dim.getWidth());
- // keep aspect ratio for height
- int height = Units.pointsToPixel(dim.getHeight());
- Rectangle2D bounds = new Rectangle2D.Double(0,0,width,height);
- draw(ctx, bounds);
- }
-
- public void draw(Graphics2D ctx, Rectangle2D graphicsBounds) {
- AffineTransform at = ctx.getTransform();
- try {
- Rectangle2D wmfBounds = getBounds();
- // scale output bounds to image bounds
- ctx.translate(graphicsBounds.getX(), graphicsBounds.getY());
- ctx.scale(graphicsBounds.getWidth()/wmfBounds.getWidth(), graphicsBounds.getHeight()/wmfBounds.getHeight());
-
- HwmfGraphics g = new HwmfGraphics(ctx, wmfBounds);
- for (HwmfRecord r : records) {
- r.draw(g);
- }
- } finally {
- ctx.setTransform(at);
- }
- }
-
- /**
- * Returns the bounding box in device-independent units. Usually this is taken from the placeable header.
- *
- * @return the bounding box
- */
- public Rectangle2D getBounds() {
- if (placeableHeader != null) {
- return placeableHeader.getBounds();
- } else {
- WmfSetWindowOrg wOrg = null;
- WmfSetWindowExt wExt = null;
- for (HwmfRecord r : getRecords()) {
- if (wOrg != null && wExt != null) {
- break;
- }
- if (r instanceof WmfSetWindowOrg) {
- wOrg = (WmfSetWindowOrg)r;
- } else if (r instanceof WmfSetWindowExt) {
- wExt = (WmfSetWindowExt)r;
- }
- }
- if (wOrg == null || wExt == null) {
- throw new RuntimeException("invalid wmf file - window records are incomplete.");
- }
- return new Rectangle2D.Double(wOrg.getX(), wOrg.getY(), wExt.getSize().getWidth(), wExt.getSize().getHeight());
- }
- }
-
- public HwmfPlaceableHeader getPlaceableHeader() {
- return placeableHeader;
- }
-
- public HwmfHeader getHeader() {
- return header;
- }
-
- /**
- * Return the image size in points
- *
- * @return the image size in points
- */
- public Dimension getSize() {
- double inch = (placeableHeader == null) ? 1440 : placeableHeader.getUnitsPerInch();
- Rectangle2D bounds = getBounds();
-
- //coefficient to translate from WMF dpi to 72dpi
- double coeff = Units.POINT_DPI/inch;
- return new Dimension((int)Math.round(bounds.getWidth()*coeff), (int)Math.round(bounds.getHeight()*coeff));
- }
- }
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