| /* |
| * 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. |
| */ |
| |
| /* $Id$ */ |
| |
| package org.apache.fop.image.loader.batik; |
| |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import javax.xml.transform.Source; |
| |
| import org.apache.commons.io.EndianUtils; |
| import org.apache.commons.io.IOUtils; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import org.apache.batik.transcoder.wmf.WMFConstants; |
| import org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore; |
| |
| import org.apache.xmlgraphics.image.loader.ImageContext; |
| import org.apache.xmlgraphics.image.loader.ImageInfo; |
| import org.apache.xmlgraphics.image.loader.ImageSize; |
| import org.apache.xmlgraphics.image.loader.impl.AbstractImagePreloader; |
| import org.apache.xmlgraphics.image.loader.util.ImageUtil; |
| import org.apache.xmlgraphics.io.XmlSourceUtil; |
| |
| import org.apache.fop.util.UnclosableInputStream; |
| |
| /** |
| * Image preloader for WMF images (Windows Metafile). |
| */ |
| public class PreloaderWMF extends AbstractImagePreloader { |
| |
| /** Logger instance */ |
| private static Log log = LogFactory.getLog(PreloaderWMF.class); |
| |
| private boolean batikAvailable = true; |
| |
| /** {@inheritDoc} */ |
| public ImageInfo preloadImage(String uri, Source src, ImageContext context) |
| throws IOException { |
| if (!ImageUtil.hasInputStream(src)) { |
| return null; |
| } |
| ImageInfo info = null; |
| if (batikAvailable) { |
| try { |
| Loader loader = new Loader(); |
| info = loader.getImage(uri, src, context); |
| } catch (NoClassDefFoundError e) { |
| batikAvailable = false; |
| log.warn("Batik not in class path", e); |
| return null; |
| } |
| } |
| if (info != null) { |
| XmlSourceUtil.closeQuietly(src); //Image is fully read |
| } |
| return info; |
| } |
| |
| /** |
| * This method is put in another class so that the class loader does not |
| * attempt to load Batik related classes when constructing the WMFPreloader |
| * class. |
| */ |
| private final class Loader { |
| |
| private Loader() { |
| } |
| |
| private ImageInfo getImage(String uri, Source src, |
| ImageContext context) { |
| // parse document and get the size attributes of the svg element |
| |
| InputStream in = new UnclosableInputStream(XmlSourceUtil.needInputStream(src)); |
| try { |
| in.mark(4 + 1); |
| |
| DataInputStream din = new DataInputStream(in); |
| int magic = EndianUtils.swapInteger(din.readInt()); |
| din.reset(); |
| if (magic != WMFConstants.META_ALDUS_APM) { |
| IOUtils.closeQuietly(din); |
| return null; //Not a WMF file |
| } |
| |
| WMFRecordStore wmfStore = new WMFRecordStore(); |
| wmfStore.read(din); |
| IOUtils.closeQuietly(din); |
| |
| int width = wmfStore.getWidthUnits(); |
| int height = wmfStore.getHeightUnits(); |
| int dpi = wmfStore.getMetaFileUnitsPerInch(); |
| |
| ImageInfo info = new ImageInfo(uri, "image/x-wmf"); |
| ImageSize size = new ImageSize(); |
| size.setSizeInPixels(width, height); |
| size.setResolution(dpi); |
| size.calcSizeFromPixels(); |
| info.setSize(size); |
| ImageWMF img = new ImageWMF(info, wmfStore); |
| info.getCustomObjects().put(ImageInfo.ORIGINAL_IMAGE, img); |
| |
| return info; |
| } catch (NoClassDefFoundError ncdfe) { |
| try { |
| in.reset(); |
| } catch (IOException ioe) { |
| // we're more interested in the original exception |
| } |
| batikAvailable = false; |
| log.warn("Batik not in class path", ncdfe); |
| return null; |
| } catch (IOException e) { |
| // If the svg is invalid then it throws an IOException |
| // so there is no way of knowing if it is an svg document |
| |
| log.debug("Error while trying to load stream as an WMF file: " |
| + e.getMessage()); |
| // assuming any exception means this document is not svg |
| // or could not be loaded for some reason |
| try { |
| in.reset(); |
| } catch (IOException ioe) { |
| // we're more interested in the original exception |
| } |
| return null; |
| } |
| } |
| } |
| |
| } |