poppler/JBIG2Stream.h

//========================================================================
//
// JBIG2Stream.h
//
// Copyright 2002-2003 Glyph & Cog, LLC
//
//========================================================================

//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2009 David Benjamin <davidben@mit.edu>
// Copyright (C) 2013 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2015 Suzuki Toshiya <mpsuzuki@hiroshima-u.ac.jp>
// Copyright (C) 2019 Oliver Sander <oliver.sander@tu-dresden.de>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================

#ifndef JBIG2STREAM_H
#define JBIG2STREAM_H

#include "Object.h"
#include "Stream.h"

class JBIG2Segment;
class JBIG2Bitmap;
class JArithmeticDecoder;
class JArithmeticDecoderStats;
class JBIG2HuffmanDecoder;
struct JBIG2HuffmanTable;
class JBIG2MMRDecoder;

//------------------------------------------------------------------------

class JBIG2Stream: public FilterStream {
public:

  JBIG2Stream(Stream *strA, Object &&globalsStreamA, Object *globalsStreamRefA);
  ~JBIG2Stream();
  StreamKind getKind() override { return strJBIG2; }
  void reset() override;
  void close() override;
  Goffset getPos() override;
  int getChar() override;
  int lookChar() override;
  GooString *getPSFilter(int psLevel, const char *indent) override;
  bool isBinary(bool last = true) override;
  virtual Object *getGlobalsStream() { return &globalsStream; }
  virtual Ref getGlobalsStreamRef() { return globalsStreamRef; }

private:
  bool hasGetChars() override { return true; }
  int getChars(int nChars, unsigned char *buffer) override;

  void readSegments();
  bool readSymbolDictSeg(unsigned int segNum, unsigned int length,
			  unsigned int *refSegs, unsigned int nRefSegs);
  void readTextRegionSeg(unsigned int segNum, bool imm,
			 bool lossless, unsigned int length,
			 unsigned int *refSegs, unsigned int nRefSegs);
  JBIG2Bitmap *readTextRegion(bool huff, bool refine,
			      int w, int h,
			      unsigned int numInstances,
			      unsigned int logStrips,
			      int numSyms,
			      JBIG2HuffmanTable *symCodeTab,
			      unsigned int symCodeLen,
			      JBIG2Bitmap **syms,
			      unsigned int defPixel, unsigned int combOp,
			      unsigned int transposed, unsigned int refCorner,
			      int sOffset,
			      JBIG2HuffmanTable *huffFSTable,
			      JBIG2HuffmanTable *huffDSTable,
			      JBIG2HuffmanTable *huffDTTable,
			      JBIG2HuffmanTable *huffRDWTable,
			      JBIG2HuffmanTable *huffRDHTable,
			      JBIG2HuffmanTable *huffRDXTable,
			      JBIG2HuffmanTable *huffRDYTable,
			      JBIG2HuffmanTable *huffRSizeTable,
			      unsigned int templ,
			      int *atx, int *aty);
  void readPatternDictSeg(unsigned int segNum, unsigned int length);
  void readHalftoneRegionSeg(unsigned int segNum, bool imm,
			     bool lossless, unsigned int length,
			     unsigned int *refSegs, unsigned int nRefSegs);
  void readGenericRegionSeg(unsigned int segNum, bool imm,
			    bool lossless, unsigned int length);
  void mmrAddPixels(int a1, int blackPixels,
		    int *codingLine, int *a0i, int w);
  void mmrAddPixelsNeg(int a1, int blackPixels,
		       int *codingLine, int *a0i, int w);
  JBIG2Bitmap *readGenericBitmap(bool mmr, int w, int h,
				 int templ, bool tpgdOn,
				 bool useSkip, JBIG2Bitmap *skip,
				 int *atx, int *aty,
				 int mmrDataLength);
  void readGenericRefinementRegionSeg(unsigned int segNum, bool imm,
				      bool lossless, unsigned int length,
				      unsigned int *refSegs,
				      unsigned int nRefSegs);
  JBIG2Bitmap *readGenericRefinementRegion(int w, int h,
					   int templ, bool tpgrOn,
					   JBIG2Bitmap *refBitmap,
					   int refDX, int refDY,
					   int *atx, int *aty);
  void readPageInfoSeg(unsigned int length);
  void readEndOfStripeSeg(unsigned int length);
  void readProfilesSeg(unsigned int length);
  void readCodeTableSeg(unsigned int segNum, unsigned int length);
  void readExtensionSeg(unsigned int length);
  JBIG2Segment *findSegment(unsigned int segNum);
  void discardSegment(unsigned int segNum);
  void resetGenericStats(unsigned int templ,
			 JArithmeticDecoderStats *prevStats);
  void resetRefinementStats(unsigned int templ,
			    JArithmeticDecoderStats *prevStats);
  void resetIntStats(int symCodeLen);
  bool readUByte(unsigned int *x);
  bool readByte(int *x);
  bool readUWord(unsigned int *x);
  bool readULong(unsigned int *x);
  bool readLong(int *x);

  Object globalsStream;
  Ref globalsStreamRef;
  unsigned int pageW, pageH, curPageH;
  unsigned int pageDefPixel;
  JBIG2Bitmap *pageBitmap;
  unsigned int defCombOp;
  std::vector<JBIG2Segment*> *segments;
  std::vector<JBIG2Segment*> *globalSegments;
  Stream *curStr;
  unsigned char *dataPtr;
  unsigned char *dataEnd;

  JArithmeticDecoder *arithDecoder;
  JArithmeticDecoderStats *genericRegionStats;
  JArithmeticDecoderStats *refinementRegionStats;
  JArithmeticDecoderStats *iadhStats;
  JArithmeticDecoderStats *iadwStats;
  JArithmeticDecoderStats *iaexStats;
  JArithmeticDecoderStats *iaaiStats;
  JArithmeticDecoderStats *iadtStats;
  JArithmeticDecoderStats *iaitStats;
  JArithmeticDecoderStats *iafsStats;
  JArithmeticDecoderStats *iadsStats;
  JArithmeticDecoderStats *iardxStats;
  JArithmeticDecoderStats *iardyStats;
  JArithmeticDecoderStats *iardwStats;
  JArithmeticDecoderStats *iardhStats;
  JArithmeticDecoderStats *iariStats;
  JArithmeticDecoderStats *iaidStats;
  JBIG2HuffmanDecoder *huffDecoder;
  JBIG2MMRDecoder *mmrDecoder;
};

#endif