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/**
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.jpedal.org
* (C) Copyright 1997-2008, IDRsolutions and Contributors.
* Main Developer: Simon Barnett
*
* This file is part of JPedal
*
* Copyright (c) 2008, IDRsolutions
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the IDRsolutions nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY IDRsolutions ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL IDRsolutions BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Other JBIG2 image decoding implementations include
* jbig2dec (http://jbig2dec.sourceforge.net/)
* xpdf (http://www.foolabs.com/xpdf/)
*
* The final draft JBIG2 specification can be found at http://www.jpeg.org/public/fcd14492.pdf
*
* All three of the above resources were used in the writing of this software, with methodologies,
* processes and inspiration taken from all three.
*
* ---------------
* TextRegionSegment.java
* ---------------
*/
package org.jpedal.jbig2.segment.region.text;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.jpedal.jbig2.JBIG2Exception;
import org.jpedal.jbig2.decoders.HuffmanDecoder;
import org.jpedal.jbig2.decoders.JBIG2StreamDecoder;
import org.jpedal.jbig2.image.JBIG2Bitmap;
import org.jpedal.jbig2.segment.Segment;
import org.jpedal.jbig2.segment.pageinformation.PageInformationSegment;
import org.jpedal.jbig2.segment.region.RegionFlags;
import org.jpedal.jbig2.segment.region.RegionSegment;
import org.jpedal.jbig2.segment.symboldictionary.SymbolDictionarySegment;
import org.jpedal.jbig2.util.BinaryOperation;
public class TextRegionSegment extends RegionSegment {
private TextRegionFlags textRegionFlags = new TextRegionFlags();
private TextRegionHuffmanFlags textRegionHuffmanFlags = new TextRegionHuffmanFlags();
private int noOfSymbolInstances;
private boolean inlineImage;
private short[] symbolRegionAdaptiveTemplateX = new short[2], symbolRegionAdaptiveTemplateY = new short[2];
public TextRegionSegment(JBIG2StreamDecoder streamDecoder, boolean inlineImage) {
super(streamDecoder);
this.inlineImage = inlineImage;
}
public void readSegment() throws IOException, JBIG2Exception {
if (JBIG2StreamDecoder.debug)
System.out.println("==== Reading Text Region ====");
super.readSegment();
/** read text region Segment flags */
readTextRegionFlags();
short[] buff = new short[4];
decoder.readByte(buff);
noOfSymbolInstances = BinaryOperation.getInt32(buff);
if (JBIG2StreamDecoder.debug)
System.out.println("noOfSymbolInstances = " + noOfSymbolInstances);
int noOfReferredToSegments = segmentHeader.getReferredToSegmentCount();
int[] referredToSegments = segmentHeader.getReferredToSegments();
List codeTables = new ArrayList();
List segmentsReferenced = new ArrayList();
int noOfSymbols = 0;
if (JBIG2StreamDecoder.debug)
System.out.println("noOfReferredToSegments = " + noOfReferredToSegments);
for (int i = 0; i < noOfReferredToSegments; i++) {
Segment seg = decoder.findSegment(referredToSegments[i]);
int type = seg.getSegmentHeader().getSegmentType();
if (type == Segment.SYMBOL_DICTIONARY) {
segmentsReferenced.add(seg);
noOfSymbols += ((SymbolDictionarySegment) seg).getNoOfExportedSymbols();
} else if (type == Segment.TABLES) {
codeTables.add(seg);
}
}
int symbolCodeLength = 0;
int count = 1;
while (count < noOfSymbols) {
symbolCodeLength++;
count <<= 1;
}
int currentSymbol = 0;
JBIG2Bitmap[] symbols = new JBIG2Bitmap[noOfSymbols];
for (Iterator it = segmentsReferenced.iterator(); it.hasNext();) {
Segment seg = (Segment) it.next();
if (seg.getSegmentHeader().getSegmentType() == Segment.SYMBOL_DICTIONARY) {
JBIG2Bitmap[] bitmaps = ((SymbolDictionarySegment) seg).getBitmaps();
for (int j = 0; j < bitmaps.length; j++) {
symbols[currentSymbol] = bitmaps[j];
currentSymbol++;
}
}
}
int[][] huffmanFSTable = null;
int[][] huffmanDSTable = null;
int[][] huffmanDTTable = null;
int[][] huffmanRDWTable = null;
int[][] huffmanRDHTable = null;
int[][] huffmanRDXTable = null;
int[][] huffmanRDYTable = null;
int[][] huffmanRSizeTable = null;
boolean sbHuffman = textRegionFlags.getFlagValue(TextRegionFlags.SB_HUFF) != 0;
int i = 0;
if (sbHuffman) {
int sbHuffFS = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_FS);
if (sbHuffFS == 0) {
huffmanFSTable = HuffmanDecoder.huffmanTableF;
} else if (sbHuffFS == 1) {
huffmanFSTable = HuffmanDecoder.huffmanTableG;
} else {
}
int sbHuffDS = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_DS);
if (sbHuffDS == 0) {
huffmanDSTable = HuffmanDecoder.huffmanTableH;
} else if (sbHuffDS == 1) {
huffmanDSTable = HuffmanDecoder.huffmanTableI;
} else if (sbHuffDS == 2) {
huffmanDSTable = HuffmanDecoder.huffmanTableJ;
} else {
}
int sbHuffDT = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_DT);
if (sbHuffDT == 0) {
huffmanDTTable = HuffmanDecoder.huffmanTableK;
} else if (sbHuffDT == 1) {
huffmanDTTable = HuffmanDecoder.huffmanTableL;
} else if (sbHuffDT == 2) {
huffmanDTTable = HuffmanDecoder.huffmanTableM;
} else {
}
int sbHuffRDW = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDW);
if (sbHuffRDW == 0) {
huffmanRDWTable = HuffmanDecoder.huffmanTableN;
} else if (sbHuffRDW == 1) {
huffmanRDWTable = HuffmanDecoder.huffmanTableO;
} else {
}
int sbHuffRDH = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDH);
if (sbHuffRDH == 0) {
huffmanRDHTable = HuffmanDecoder.huffmanTableN;
} else if (sbHuffRDH == 1) {
huffmanRDHTable = HuffmanDecoder.huffmanTableO;
} else {
}
int sbHuffRDX = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDX);
if (sbHuffRDX == 0) {
huffmanRDXTable = HuffmanDecoder.huffmanTableN;
} else if (sbHuffRDX == 1) {
huffmanRDXTable = HuffmanDecoder.huffmanTableO;
} else {
}
int sbHuffRDY = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDY);
if (sbHuffRDY == 0) {
huffmanRDYTable = HuffmanDecoder.huffmanTableN;
} else if (sbHuffRDY == 1) {
huffmanRDYTable = HuffmanDecoder.huffmanTableO;
} else {
}
int sbHuffRSize = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_RSIZE);
if (sbHuffRSize == 0) {
huffmanRSizeTable = HuffmanDecoder.huffmanTableA;
} else {
}
}
int[][] runLengthTable = new int[36][4];
int[][] symbolCodeTable = new int[noOfSymbols + 1][4];
if (sbHuffman) {
decoder.consumeRemainingBits();
for (i = 0; i < 32; i++) {
runLengthTable[i] = new int[] { i, decoder.readBits(4), 0, 0 };
}
runLengthTable[32] = new int[] { 0x103, decoder.readBits(4), 2, 0 };
runLengthTable[33] = new int[] { 0x203, decoder.readBits(4), 3, 0 };
runLengthTable[34] = new int[] { 0x20b, decoder.readBits(4), 7, 0 };
runLengthTable[35] = new int[] { 0, 0, HuffmanDecoder.jbig2HuffmanEOT };
runLengthTable = huffmanDecoder.buildTable(runLengthTable, 35);
for (i = 0; i < noOfSymbols; i++) {
symbolCodeTable[i] = new int[] { i, 0, 0, 0 };
}
i = 0;
while (i < noOfSymbols) {
int j = huffmanDecoder.decodeInt(runLengthTable).intResult();
if (j > 0x200) {
for (j -= 0x200; j != 0 && i < noOfSymbols; j--) {
symbolCodeTable[i++][1] = 0;
}
} else if (j > 0x100) {
for (j -= 0x100; j != 0 && i < noOfSymbols; j--) {
symbolCodeTable[i][1] = symbolCodeTable[i - 1][1];
i++;
}
} else {
symbolCodeTable[i++][1] = j;
}
}
symbolCodeTable[noOfSymbols][1] = 0;
symbolCodeTable[noOfSymbols][2] = HuffmanDecoder.jbig2HuffmanEOT;
symbolCodeTable = huffmanDecoder.buildTable(symbolCodeTable, noOfSymbols);
decoder.consumeRemainingBits();
} else {
symbolCodeTable = null;
arithmeticDecoder.resetIntStats(symbolCodeLength);
arithmeticDecoder.start();
}
boolean symbolRefine = textRegionFlags.getFlagValue(TextRegionFlags.SB_REFINE) != 0;
int logStrips = textRegionFlags.getFlagValue(TextRegionFlags.LOG_SB_STRIPES);
int defaultPixel = textRegionFlags.getFlagValue(TextRegionFlags.SB_DEF_PIXEL);
int combinationOperator = textRegionFlags.getFlagValue(TextRegionFlags.SB_COMB_OP);
boolean transposed = textRegionFlags.getFlagValue(TextRegionFlags.TRANSPOSED) != 0;
int referenceCorner = textRegionFlags.getFlagValue(TextRegionFlags.REF_CORNER);
int sOffset = textRegionFlags.getFlagValue(TextRegionFlags.SB_DS_OFFSET);
int template = textRegionFlags.getFlagValue(TextRegionFlags.SB_R_TEMPLATE);
if (symbolRefine) {
arithmeticDecoder.resetRefinementStats(template, null);
}
JBIG2Bitmap bitmap = new JBIG2Bitmap(regionBitmapWidth, regionBitmapHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
bitmap.readTextRegion(sbHuffman, symbolRefine, noOfSymbolInstances, logStrips, noOfSymbols, symbolCodeTable, symbolCodeLength, symbols, defaultPixel, combinationOperator, transposed, referenceCorner, sOffset, huffmanFSTable, huffmanDSTable, huffmanDTTable, huffmanRDWTable, huffmanRDHTable, huffmanRDXTable, huffmanRDYTable, huffmanRSizeTable, template, symbolRegionAdaptiveTemplateX, symbolRegionAdaptiveTemplateY, decoder);
if (inlineImage) {
PageInformationSegment pageSegment = decoder.findPageSegement(segmentHeader.getPageAssociation());
JBIG2Bitmap pageBitmap = pageSegment.getPageBitmap();
if (JBIG2StreamDecoder.debug)
System.out.println(pageBitmap + " " + bitmap);
int externalCombinationOperator = regionFlags.getFlagValue(RegionFlags.EXTERNAL_COMBINATION_OPERATOR);
pageBitmap.combine(bitmap, regionBitmapXLocation, regionBitmapYLocation, externalCombinationOperator);
} else {
bitmap.setBitmapNumber(getSegmentHeader().getSegmentNumber());
decoder.appendBitmap(bitmap);
}
decoder.consumeRemainingBits();
}
private void readTextRegionFlags() throws IOException {
/** extract text region Segment flags */
short[] textRegionFlagsField = new short[2];
decoder.readByte(textRegionFlagsField);
int flags = BinaryOperation.getInt16(textRegionFlagsField);
textRegionFlags.setFlags(flags);
if (JBIG2StreamDecoder.debug)
System.out.println("text region Segment flags = " + flags);
boolean sbHuff = textRegionFlags.getFlagValue(TextRegionFlags.SB_HUFF) != 0;
if (sbHuff) {
/** extract text region Segment Huffman flags */
short[] textRegionHuffmanFlagsField = new short[2];
decoder.readByte(textRegionHuffmanFlagsField);
flags = BinaryOperation.getInt16(textRegionHuffmanFlagsField);
textRegionHuffmanFlags.setFlags(flags);
if (JBIG2StreamDecoder.debug)
System.out.println("text region segment Huffman flags = " + flags);
}
boolean sbRefine = textRegionFlags.getFlagValue(TextRegionFlags.SB_REFINE) != 0;
int sbrTemplate = textRegionFlags.getFlagValue(TextRegionFlags.SB_R_TEMPLATE);
if (sbRefine && sbrTemplate == 0) {
symbolRegionAdaptiveTemplateX[0] = readATValue();
symbolRegionAdaptiveTemplateY[0] = readATValue();
symbolRegionAdaptiveTemplateX[1] = readATValue();
symbolRegionAdaptiveTemplateY[1] = readATValue();
}
}
public TextRegionFlags getTextRegionFlags() {
return textRegionFlags;
}
public TextRegionHuffmanFlags getTextRegionHuffmanFlags() {
return textRegionHuffmanFlags;
}
}
