| /* ==================================================================== |
| 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.hslf.blip; |
| |
| import java.awt.Dimension; |
| import java.awt.Rectangle; |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.zip.InflaterInputStream; |
| |
| import org.apache.poi.hslf.exceptions.HSLFException; |
| import org.apache.poi.util.LittleEndian; |
| import org.apache.poi.util.LocaleUtil; |
| import org.apache.poi.util.Units; |
| |
| /** |
| * Represents EMF (Windows Enhanced Metafile) picture data. |
| */ |
| public final class EMF extends Metafile { |
| |
| public static class NativeHeader { |
| // rectangular inclusive-inclusive bounds, in device units, of the smallest |
| // rectangle that can be drawn around the image stored in the metafile. |
| private final Rectangle deviceBounds; |
| |
| private final static String EMF_SIGNATURE = " EMF"; // 0x464D4520 (LE) |
| |
| public NativeHeader(byte data[], int offset) { |
| int type = (int)LittleEndian.getUInt(data, offset); offset += 4; |
| if (type != 1) { |
| throw new HSLFException("Invalid EMF picture"); |
| } |
| // ignore header size |
| offset += 4; |
| int left = LittleEndian.getInt(data, offset); offset += 4; |
| int top = LittleEndian.getInt(data, offset); offset += 4; |
| int right = LittleEndian.getInt(data, offset); offset += 4; |
| int bottom = LittleEndian.getInt(data, offset); offset += 4; |
| deviceBounds = new Rectangle(left, top, right-left, bottom-top); |
| // ignore frame bounds |
| offset += 16; |
| String signature = new String(data, offset, EMF_SIGNATURE.length(), LocaleUtil.CHARSET_1252); |
| if (!EMF_SIGNATURE.equals(signature)) { |
| throw new HSLFException("Invalid EMF picture"); |
| } |
| } |
| |
| public Dimension getSize() { |
| return deviceBounds.getSize(); |
| } |
| } |
| |
| @Override |
| public byte[] getData(){ |
| try { |
| byte[] rawdata = getRawData(); |
| |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| InputStream is = new ByteArrayInputStream( rawdata ); |
| Header header = new Header(); |
| header.read(rawdata, CHECKSUM_SIZE); |
| long len = is.skip(header.getSize() + CHECKSUM_SIZE); |
| assert(len == header.getSize() + CHECKSUM_SIZE); |
| |
| InflaterInputStream inflater = new InflaterInputStream( is ); |
| byte[] chunk = new byte[4096]; |
| int count; |
| while ((count = inflater.read(chunk)) >=0 ) { |
| out.write(chunk,0,count); |
| } |
| inflater.close(); |
| return out.toByteArray(); |
| } catch (IOException e){ |
| throw new HSLFException(e); |
| } |
| } |
| |
| @Override |
| public void setData(byte[] data) throws IOException { |
| byte[] compressed = compress(data, 0, data.length); |
| |
| NativeHeader nHeader = new NativeHeader(data, 0); |
| |
| Header header = new Header(); |
| header.wmfsize = data.length; |
| header.bounds = nHeader.deviceBounds; |
| Dimension nDim = nHeader.getSize(); |
| header.size = new Dimension(Units.toEMU(nDim.getWidth()), Units.toEMU(nDim.getHeight())); |
| header.zipsize = compressed.length; |
| |
| byte[] checksum = getChecksum(data); |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| out.write(checksum); |
| if (uidInstanceCount == 2) { |
| out.write(checksum); |
| } |
| header.write(out); |
| out.write(compressed); |
| |
| setRawData(out.toByteArray()); |
| } |
| |
| @Override |
| public PictureType getType(){ |
| return PictureType.EMF; |
| } |
| |
| /** |
| * EMF signature is {@code 0x3D40} or {@code 0x3D50} |
| * |
| * @return EMF signature ({@code 0x3D40} or {@code 0x3D50}) |
| */ |
| public int getSignature(){ |
| return (uidInstanceCount == 1 ? 0x3D40 : 0x3D50); |
| } |
| |
| /** |
| * Sets the EMF signature - either {@code 0x3D40} or {@code 0x3D50} |
| */ |
| public void setSignature(int signature) { |
| switch (signature) { |
| case 0x3D40: |
| uidInstanceCount = 1; |
| break; |
| case 0x3D50: |
| uidInstanceCount = 2; |
| break; |
| default: |
| throw new IllegalArgumentException(signature+" is not a valid instance/signature value for EMF"); |
| } |
| } |
| } |