| /* ==================================================================== |
| 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.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.util.zip.InflaterInputStream; |
| |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| import org.apache.poi.hslf.exceptions.HSLFException; |
| import org.apache.poi.sl.image.ImageHeaderPICT; |
| import org.apache.poi.util.IOUtils; |
| import org.apache.poi.util.Units; |
| |
| import static org.apache.logging.log4j.util.Unbox.box; |
| |
| /** |
| * Represents Macintosh PICT picture data. |
| */ |
| public final class PICT extends Metafile { |
| private static final Logger LOG = LogManager.getLogger(PICT.class); |
| |
| |
| @Override |
| public byte[] getData(){ |
| byte[] rawdata = getRawData(); |
| try { |
| byte[] macheader = new byte[512]; |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| out.write(macheader); |
| int pos = CHECKSUM_SIZE*getUIDInstanceCount(); |
| byte[] pict = read(rawdata, pos); |
| out.write(pict); |
| return out.toByteArray(); |
| } catch (IOException e){ |
| throw new HSLFException(e); |
| } |
| } |
| |
| private byte[] read(byte[] data, int pos) throws IOException { |
| ByteArrayInputStream bis = new ByteArrayInputStream(data); |
| Header header = new Header(); |
| header.read(data, pos); |
| long bs_exp = (long)pos + header.getSize(); |
| long bs_act = IOUtils.skipFully(bis, bs_exp); |
| if (bs_exp != bs_act) { |
| throw new EOFException(); |
| } |
| byte[] chunk = new byte[4096]; |
| ByteArrayOutputStream out = new ByteArrayOutputStream(header.getWmfSize()); |
| try (InflaterInputStream inflater = new InflaterInputStream(bis)) { |
| int count; |
| while ((count = inflater.read(chunk)) >= 0) { |
| out.write(chunk, 0, count); |
| // PICT zip-stream can be erroneous, so we clear the array to determine |
| // the maximum of read bytes, after the inflater crashed |
| bytefill(chunk, (byte) 0); |
| } |
| } catch (Exception e) { |
| int lastLen; |
| for (lastLen = chunk.length - 1; lastLen >= 0 && chunk[lastLen] == 0; lastLen--) ; |
| if (++lastLen > 0) { |
| if (header.getWmfSize() > out.size()) { |
| // sometimes the wmfsize is smaller than the amount of already successfully read bytes |
| // in this case we take the lastLen as-is, otherwise we truncate it to the given size |
| lastLen = Math.min(lastLen, header.getWmfSize() - out.size()); |
| } |
| out.write(chunk, 0, lastLen); |
| } |
| // End of picture marker for PICT is 0x00 0xFF |
| LOG.atError().withThrowable(e).log("PICT zip-stream is invalid, read as much as possible. Uncompressed length of header: {} / Read bytes: {}", box(header.getWmfSize()),box(out.size())); |
| } |
| return out.toByteArray(); |
| } |
| |
| @Override |
| public void setData(byte[] data) throws IOException { |
| // skip the first 512 bytes - they are MAC specific crap |
| final int nOffset = ImageHeaderPICT.PICT_HEADER_OFFSET; |
| ImageHeaderPICT nHeader = new ImageHeaderPICT(data, nOffset); |
| |
| Header header = new Header(); |
| int wmfSize = data.length - nOffset; |
| header.setWmfSize(wmfSize); |
| byte[] compressed = compress(data, nOffset, wmfSize); |
| header.setZipSize(compressed.length); |
| header.setBounds(nHeader.getBounds()); |
| Dimension nDim = nHeader.getSize(); |
| header.setDimension(new Dimension(Units.toEMU(nDim.getWidth()), Units.toEMU(nDim.getHeight()))); |
| |
| byte[] checksum = getChecksum(data); |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| out.write(checksum); |
| if (getUIDInstanceCount() == 2) { |
| out.write(checksum); |
| } |
| header.write(out); |
| out.write(compressed); |
| |
| setRawData(out.toByteArray()); |
| } |
| |
| @Override |
| public PictureType getType(){ |
| return PictureType.PICT; |
| } |
| |
| /** |
| * PICT signature is {@code 0x5420} or {@code 0x5430} |
| * |
| * @return PICT signature ({@code 0x5420} or {@code 0x5430}) |
| */ |
| public int getSignature(){ |
| return (getUIDInstanceCount() == 1 ? 0x5420 : 0x5430); |
| } |
| |
| /** |
| * Sets the PICT signature - either {@code 0x5420} or {@code 0x5430} |
| */ |
| public void setSignature(int signature) { |
| switch (signature) { |
| case 0x5420: |
| setUIDInstanceCount(1); |
| break; |
| case 0x5430: |
| setUIDInstanceCount(2); |
| break; |
| default: |
| throw new IllegalArgumentException(signature+" is not a valid instance/signature value for PICT"); |
| } |
| } |
| |
| |
| /* |
| * initialize a smaller piece of the array and use the System.arraycopy |
| * call to fill in the rest of the array in an expanding binary fashion |
| */ |
| private static void bytefill(byte[] array, byte value) { |
| // http://stackoverflow.com/questions/9128737/fastest-way-to-set-all-values-of-an-array |
| int len = array.length; |
| |
| if (len > 0){ |
| array[0] = value; |
| } |
| |
| for (int i = 1; i < len; i += i) { |
| System.arraycopy(array, 0, array, i, Math.min(len - i, i)); |
| } |
| } |
| } |