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/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2017 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* LZW.java
* ---------------
*/
package org.jpedal.io.filter;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.util.Map;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.sun.LZWDecoder;
/**
* LZW
*/
public class LZW extends BaseFilter implements PdfFilter {
// default values
private int predictor = 1;
private int EarlyChange = 1;
private int colors = 1;
private int bitsPerComponent = 8;
private int rows;
private int columns;
public LZW(final PdfObject decodeParms, final int width, final int height) {
super(decodeParms);
rows = height;
columns = width;
if (decodeParms != null) {
final int newBitsPerComponent = decodeParms.getInt(PdfDictionary.BitsPerComponent);
if (newBitsPerComponent != -1) {
bitsPerComponent = newBitsPerComponent;
}
final int newColors = decodeParms.getInt(PdfDictionary.Colors);
if (newColors != -1) {
colors = newColors;
}
final int columnsSet = decodeParms.getInt(PdfDictionary.Columns);
if (columnsSet != -1) {
columns = columnsSet;
}
EarlyChange = decodeParms.getInt(PdfDictionary.EarlyChange);
predictor = decodeParms.getInt(PdfDictionary.Predictor);
final int rowsSet = decodeParms.getInt(PdfDictionary.Rows);
if (rowsSet != -1) {
rows = rowsSet;
}
}
}
@Override
public byte[] decode(byte[] data) throws Exception {
if (rows * columns == 1) {
if (data != null) {
final int bitsPerComponent1 = 8;
final byte[] processed_data = new byte[bitsPerComponent1 * rows
* ((columns + 7) >> 3)]; // will be resized if needed
// 9allow for not a full 8
// bits
final TiffLZW lzw_decode = new TiffLZW();
lzw_decode.decompress(data, processed_data);
return applyPredictor(predictor, processed_data, colors, bitsPerComponent1, columns);
}
} else { // version for no parameters
if (data != null) {
final ByteArrayOutputStream processed = new ByteArrayOutputStream();
final LZWDecoder lzw = new LZWDecoder();
lzw.decode(data, processed, EarlyChange == 1);
processed.close();
data = processed.toByteArray();
}
data = applyPredictor(predictor, data, colors, bitsPerComponent, columns);
}
return data;
}
@Override
public void decode(final BufferedInputStream bis, final BufferedOutputStream streamCache, final String cacheName, final Map cachedObjects) throws Exception {
if (rows * columns != 1) {
// decompress cached object
if (bis != null) {
final TiffLZWBuffer lzw2 = new TiffLZWBuffer();
lzw2.decompress(streamCache, bis);
}
if (predictor != 1 && predictor != 10) {
streamCache.flush();
streamCache.close();
if (cacheName != null) {
setupCachedObjectForDecoding(cacheName);
}
}
applyPredictor(predictor, null, colors, bitsPerComponent, columns);
}
}
}
