237 lines
8.9 KiB
Java
237 lines
8.9 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hslf.blip;
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import java.awt.Dimension;
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import java.awt.Rectangle;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.zip.InflaterInputStream;
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import org.apache.poi.hslf.exceptions.HSLFException;
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import org.apache.poi.util.POILogFactory;
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import org.apache.poi.util.POILogger;
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import org.apache.poi.util.Units;
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/**
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* Represents Macintosh PICT picture data.
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*/
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public final class PICT extends Metafile {
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private static POILogger LOG = POILogFactory.getLogger(PICT.class);
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public static class NativeHeader {
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/**
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* skip the first 512 bytes - they are MAC specific crap
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*/
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public static final int PICT_HEADER_OFFSET = 512;
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public static final double DEFAULT_RESOLUTION = Units.POINT_DPI;
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private static final byte V2_HEADER[] = {
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0x00, 0x11, // v2 version opcode
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0x02, (byte)0xFF, // version number of new picture
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0x0C, 0x00, // header opcode
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(byte)0xFF, (byte)0xFE, 0x00, 0x00 // pic size dummy
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};
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public final Rectangle bounds;
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public final double hRes, vRes;
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public NativeHeader(byte data[], int offset) {
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// http://mirrors.apple2.org.za/apple.cabi.net/Graphics/PICT.and_QT.INFO/PICT.file.format.TI.txt
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// low order 16 bits of picture size - can be ignored
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offset += 2;
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// rectangular bounding box of picture, at 72 dpi
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// rect : 8 bytes (top, left, bottom, right: integer)
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int y1 = readUnsignedShort(data, offset); offset += 2;
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int x1 = readUnsignedShort(data, offset); offset += 2;
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int y2 = readUnsignedShort(data, offset); offset += 2;
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int x2 = readUnsignedShort(data, offset); offset += 2;
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// check for version 2 ... otherwise we don't read any further
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boolean isV2 = true;
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for (byte b : V2_HEADER) {
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if (b != data[offset++]) {
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isV2 = false;
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break;
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}
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}
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if (isV2) {
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// 4 bytes - fixed, horizontal resolution (dpi) of source data
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hRes = readFixedPoint(data, offset); offset += 4;
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// 4 bytes - fixed, vertical resolution (dpi) of source data
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vRes = readFixedPoint(data, offset); offset += 4;
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} else {
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hRes = DEFAULT_RESOLUTION;
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vRes = DEFAULT_RESOLUTION;
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}
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bounds = new Rectangle(x1,y1,x2-x1,y2-y1);
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}
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public Dimension getSize() {
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int height = (int)Math.round(bounds.height*DEFAULT_RESOLUTION/vRes);
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int width = (int)Math.round(bounds.width*DEFAULT_RESOLUTION/hRes);
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return new Dimension(width, height);
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}
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private static int readUnsignedShort(byte data[], int offset) {
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int b0 = data[offset] & 0xFF;
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int b1 = data[offset+1] & 0xFF;
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return b0 << 8 | b1;
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}
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private static double readFixedPoint(byte data[], int offset) {
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int b0 = data[offset] & 0xFF;
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int b1 = data[offset+1] & 0xFF;
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int b2 = data[offset+2] & 0xFF;
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int b3 = data[offset+3] & 0xFF;
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int i = (b0 << 24) | (b1 << 16) | (b2 << 8) | b3;
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return i / (double)0x10000;
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}
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}
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@Override
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public byte[] getData(){
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byte[] rawdata = getRawData();
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try {
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byte[] macheader = new byte[512];
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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out.write(macheader);
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int pos = CHECKSUM_SIZE*uidInstanceCount;
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byte[] pict = read(rawdata, pos);
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out.write(pict);
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return out.toByteArray();
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} catch (IOException e){
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throw new HSLFException(e);
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}
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}
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private byte[] read(byte[] data, int pos) throws IOException {
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ByteArrayInputStream bis = new ByteArrayInputStream(data);
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Header header = new Header();
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header.read(data, pos);
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bis.skip(pos + header.getSize());
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byte[] chunk = new byte[4096];
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ByteArrayOutputStream out = new ByteArrayOutputStream(header.getWmfSize());
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InflaterInputStream inflater = new InflaterInputStream( bis );
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try {
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int count;
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while ((count = inflater.read(chunk)) >=0 ) {
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out.write(chunk,0,count);
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// PICT zip-stream can be erroneous, so we clear the array to determine
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// the maximum of read bytes, after the inflater crashed
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bytefill(chunk, (byte)0);
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}
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} catch (Exception e) {
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int lastLen;
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for (lastLen=chunk.length-1; lastLen>=0 && chunk[lastLen] == 0; lastLen--);
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if (++lastLen > 0) {
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if (header.getWmfSize() > out.size()) {
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// sometimes the wmfsize is smaller than the amount of already successfully read bytes
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// in this case we take the lastLen as-is, otherwise we truncate it to the given size
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lastLen = Math.min(lastLen, header.getWmfSize() - out.size());
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}
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out.write(chunk,0,lastLen);
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}
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// End of picture marker for PICT is 0x00 0xFF
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LOG.log(POILogger.ERROR, "PICT zip-stream is invalid, read as much as possible. Uncompressed length of header: "+header.getWmfSize()+" / Read bytes: "+out.size(), e);
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} finally {
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inflater.close();
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}
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return out.toByteArray();
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}
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@Override
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public void setData(byte[] data) throws IOException {
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// skip the first 512 bytes - they are MAC specific crap
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final int nOffset = NativeHeader.PICT_HEADER_OFFSET;
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NativeHeader nHeader = new NativeHeader(data, nOffset);
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Header header = new Header();
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header.wmfsize = data.length - nOffset;
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byte[] compressed = compress(data, nOffset, header.wmfsize);
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header.zipsize = compressed.length;
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header.bounds = nHeader.bounds;
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Dimension nDim = nHeader.getSize();
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header.size = new Dimension(Units.toEMU(nDim.getWidth()), Units.toEMU(nDim.getHeight()));
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byte[] checksum = getChecksum(data);
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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out.write(checksum);
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if (uidInstanceCount == 2) {
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out.write(checksum);
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}
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header.write(out);
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out.write(compressed);
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setRawData(out.toByteArray());
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}
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@Override
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public PictureType getType(){
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return PictureType.PICT;
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}
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/**
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* PICT signature is {@code 0x5420} or {@code 0x5430}
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*
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* @return PICT signature ({@code 0x5420} or {@code 0x5430})
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*/
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public int getSignature(){
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return (uidInstanceCount == 1 ? 0x5420 : 0x5430);
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}
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/**
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* Sets the PICT signature - either {@code 0x5420} or {@code 0x5430}
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*/
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public void setSignature(int signature) {
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switch (signature) {
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case 0x5420:
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uidInstanceCount = 1;
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break;
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case 0x5430:
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uidInstanceCount = 2;
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break;
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default:
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throw new IllegalArgumentException(signature+" is not a valid instance/signature value for PICT");
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}
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}
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/*
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* initialize a smaller piece of the array and use the System.arraycopy
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* call to fill in the rest of the array in an expanding binary fashion
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*/
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private static void bytefill(byte[] array, byte value) {
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// http://stackoverflow.com/questions/9128737/fastest-way-to-set-all-values-of-an-array
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int len = array.length;
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if (len > 0){
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array[0] = value;
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}
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for (int i = 1; i < len; i += i) {
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System.arraycopy(array, 0, array, i, ((len - i) < i) ? (len - i) : i);
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}
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}
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}
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