| /* ==================================================================== |
| 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.util.zip.InflaterInputStream; |
| |
| import org.apache.poi.hslf.exceptions.HSLFException; |
| import org.apache.poi.util.POILogFactory; |
| import org.apache.poi.util.POILogger; |
| import org.apache.poi.util.Units; |
| |
| /** |
| * Represents Macintosh PICT picture data. |
| */ |
| public final class PICT extends Metafile { |
| private static final POILogger LOG = POILogFactory.getLogger(PICT.class); |
| |
| public static class NativeHeader { |
| /** |
| * skip the first 512 bytes - they are MAC specific crap |
| */ |
| public static final int PICT_HEADER_OFFSET = 512; |
| |
| public static final double DEFAULT_RESOLUTION = Units.POINT_DPI; |
| |
| private static final byte V2_HEADER[] = { |
| 0x00, 0x11, // v2 version opcode |
| 0x02, (byte)0xFF, // version number of new picture |
| 0x0C, 0x00, // header opcode |
| (byte)0xFF, (byte)0xFE, 0x00, 0x00 // pic size dummy |
| }; |
| |
| public final Rectangle bounds; |
| public final double hRes, vRes; |
| |
| public NativeHeader(byte data[], int offset) { |
| // http://mirrors.apple2.org.za/apple.cabi.net/Graphics/PICT.and_QT.INFO/PICT.file.format.TI.txt |
| |
| // low order 16 bits of picture size - can be ignored |
| offset += 2; |
| // rectangular bounding box of picture, at 72 dpi |
| // rect : 8 bytes (top, left, bottom, right: integer) |
| int y1 = readUnsignedShort(data, offset); offset += 2; |
| int x1 = readUnsignedShort(data, offset); offset += 2; |
| int y2 = readUnsignedShort(data, offset); offset += 2; |
| int x2 = readUnsignedShort(data, offset); offset += 2; |
| |
| // check for version 2 ... otherwise we don't read any further |
| boolean isV2 = true; |
| for (byte b : V2_HEADER) { |
| if (b != data[offset++]) { |
| isV2 = false; |
| break; |
| } |
| } |
| |
| if (isV2) { |
| // 4 bytes - fixed, horizontal resolution (dpi) of source data |
| hRes = readFixedPoint(data, offset); offset += 4; |
| // 4 bytes - fixed, vertical resolution (dpi) of source data |
| vRes = readFixedPoint(data, offset); offset += 4; |
| } else { |
| hRes = DEFAULT_RESOLUTION; |
| vRes = DEFAULT_RESOLUTION; |
| } |
| |
| bounds = new Rectangle(x1,y1,x2-x1,y2-y1); |
| } |
| |
| public Dimension getSize() { |
| int height = (int)Math.round(bounds.height*DEFAULT_RESOLUTION/vRes); |
| int width = (int)Math.round(bounds.width*DEFAULT_RESOLUTION/hRes); |
| return new Dimension(width, height); |
| } |
| |
| private static int readUnsignedShort(byte data[], int offset) { |
| int b0 = data[offset] & 0xFF; |
| int b1 = data[offset+1] & 0xFF; |
| return b0 << 8 | b1; |
| } |
| |
| private static double readFixedPoint(byte data[], int offset) { |
| int b0 = data[offset] & 0xFF; |
| int b1 = data[offset+1] & 0xFF; |
| int b2 = data[offset+2] & 0xFF; |
| int b3 = data[offset+3] & 0xFF; |
| int i = (b0 << 24) | (b1 << 16) | (b2 << 8) | b3; |
| return i / (double)0x10000; |
| } |
| } |
| |
| @Override |
| public byte[] getData(){ |
| byte[] rawdata = getRawData(); |
| try { |
| byte[] macheader = new byte[512]; |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| out.write(macheader); |
| int pos = CHECKSUM_SIZE*uidInstanceCount; |
| 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); |
| bis.skip(pos + header.getSize()); |
| byte[] chunk = new byte[4096]; |
| ByteArrayOutputStream out = new ByteArrayOutputStream(header.getWmfSize()); |
| InflaterInputStream inflater = new InflaterInputStream( bis ); |
| try { |
| 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.log(POILogger.ERROR, "PICT zip-stream is invalid, read as much as possible. Uncompressed length of header: "+header.getWmfSize()+" / Read bytes: "+out.size(), e); |
| } finally { |
| inflater.close(); |
| } |
| return out.toByteArray(); |
| } |
| |
| @Override |
| public void setData(byte[] data) throws IOException { |
| // skip the first 512 bytes - they are MAC specific crap |
| final int nOffset = NativeHeader.PICT_HEADER_OFFSET; |
| NativeHeader nHeader = new NativeHeader(data, nOffset); |
| |
| Header header = new Header(); |
| header.wmfsize = data.length - nOffset; |
| byte[] compressed = compress(data, nOffset, header.wmfsize); |
| header.zipsize = compressed.length; |
| header.bounds = nHeader.bounds; |
| Dimension nDim = nHeader.getSize(); |
| header.size = new Dimension(Units.toEMU(nDim.getWidth()), Units.toEMU(nDim.getHeight())); |
| |
| 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.PICT; |
| } |
| |
| /** |
| * PICT signature is {@code 0x5420} or {@code 0x5430} |
| * |
| * @return PICT signature ({@code 0x5420} or {@code 0x5430}) |
| */ |
| public int getSignature(){ |
| return (uidInstanceCount == 1 ? 0x5420 : 0x5430); |
| } |
| |
| /** |
| * Sets the PICT signature - either {@code 0x5420} or {@code 0x5430} |
| */ |
| public void setSignature(int signature) { |
| switch (signature) { |
| case 0x5420: |
| uidInstanceCount = 1; |
| break; |
| case 0x5430: |
| uidInstanceCount = 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, ((len - i) < i) ? (len - i) : i); |
| } |
| } |
| } |