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//========================================================================
//
// Stream.h
//
// Copyright 1996-2003 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) 2005 Jeff Muizelaar <jeff@infidigm.net>
// Copyright (C) 2008 Julien Rebetez <julien@fhtagn.net>
// Copyright (C) 2008, 2010 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2009 Carlos Garcia Campos <carlosgc@gnome.org>
// Copyright (C) 2009 Stefan Thomas <thomas@eload24.com>
// Copyright (C) 2010 Hib Eris <hib@hiberis.nl>
//
// 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 STREAM_H
#define STREAM_H
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
#include <stdio.h>
#include "goo/gtypes.h"
#include "Object.h"
class BaseStream;
class CachedFile;
//------------------------------------------------------------------------
enum StreamKind {
strFile,
strCachedFile,
strASCIIHex,
strASCII85,
strLZW,
strRunLength,
strCCITTFax,
strDCT,
strFlate,
strJBIG2,
strJPX,
strWeird // internal-use stream types
};
enum StreamColorSpaceMode {
streamCSNone,
streamCSDeviceGray,
streamCSDeviceRGB,
streamCSDeviceCMYK
};
//------------------------------------------------------------------------
// This is in Stream.h instead of Decrypt.h to avoid really annoying
// include file dependency loops.
enum CryptAlgorithm {
cryptRC4,
cryptAES
};
//------------------------------------------------------------------------
typedef struct _ByteRange {
Guint offset;
Guint length;
} ByteRange;
//------------------------------------------------------------------------
// Stream (base class)
//------------------------------------------------------------------------
class Stream {
public:
// Constructor.
Stream();
// Destructor.
virtual ~Stream();
// Reference counting.
int incRef() { return ++ref; }
int decRef() { return --ref; }
// Get kind of stream.
virtual StreamKind getKind() = 0;
// Reset stream to beginning.
virtual void reset() = 0;
// Close down the stream.
virtual void close();
inline int doGetChars(int nChars, Guchar *buffer)
{
if (hasGetChars()) {
return getChars(nChars, buffer);
} else {
for (int i = 0; i < nChars; ++i) {
const int c = getChar();
if (likely(c != EOF)) buffer[i] = c;
else return i;
}
return nChars;
}
}
inline void fillGooString(GooString *s)
{
Guchar readBuf[4096];
int readChars;
reset();
while ((readChars = doGetChars(4096, readBuf)) != 0) {
s->append((const char *)readBuf, readChars);
}
}
inline Guchar *toUnsignedChars(int *length, int initialSize = 4096, int sizeIncrement = 4096)
{
int readChars;
Guchar *buf = (Guchar *)gmalloc(initialSize);
int size = initialSize;
*length = 0;
int charsToRead = initialSize;
bool continueReading = true;
reset();
while (continueReading && (readChars = doGetChars(charsToRead, &buf[*length])) != 0) {
*length += readChars;
if (readChars == charsToRead) {
if (lookChar() != EOF) {
size += sizeIncrement;
charsToRead = sizeIncrement;
buf = (Guchar *)grealloc(buf, size);
} else {
continueReading = false;
}
} else {
continueReading = false;
}
}
return buf;
}
// Get next char from stream.
virtual int getChar() = 0;
// Peek at next char in stream.
virtual int lookChar() = 0;
// Get next char from stream without using the predictor.
// This is only used by StreamPredictor.
virtual int getRawChar();
virtual void getRawChars(int nChars, int *buffer);
// Get next char directly from stream source, without filtering it
virtual int getUnfilteredChar () = 0;
// Resets the stream without reading anything (even not the headers)
// WARNING: Reading the stream with something else than getUnfilteredChar
// may lead to unexcepted behaviour until you call reset ()
virtual void unfilteredReset () = 0;
// Get next line from stream.
virtual char *getLine(char *buf, int size);
// Get current position in file.
virtual int getPos() = 0;
// Go to a position in the stream. If <dir> is negative, the
// position is from the end of the file; otherwise the position is
// from the start of the file.
virtual void setPos(Guint pos, int dir = 0) = 0;
// Get PostScript command for the filter(s).
virtual GooString *getPSFilter(int psLevel, char *indent);
// Does this stream type potentially contain non-printable chars?
virtual GBool isBinary(GBool last = gTrue) = 0;
// Get the BaseStream of this stream.
virtual BaseStream *getBaseStream() = 0;
// Get the stream after the last decoder (this may be a BaseStream
// or a DecryptStream).
virtual Stream *getUndecodedStream() = 0;
// Get the dictionary associated with this stream.
virtual Dict *getDict() = 0;
// Is this an encoding filter?
virtual GBool isEncoder() { return gFalse; }
// Get image parameters which are defined by the stream contents.
virtual void getImageParams(int * /*bitsPerComponent*/,
StreamColorSpaceMode * /*csMode*/) {}
// Return the next stream in the "stack".
virtual Stream *getNextStream() { return NULL; }
// Add filters to this stream according to the parameters in <dict>.
// Returns the new stream.
Stream *addFilters(Object *dict);
private:
virtual GBool hasGetChars() { return false; }
virtual int getChars(int nChars, Guchar *buffer);
Stream *makeFilter(char *name, Stream *str, Object *params);
int ref; // reference count
};
//------------------------------------------------------------------------
// OutStream
//
// This is the base class for all streams that output to a file
//------------------------------------------------------------------------
class OutStream {
public:
// Constructor.
OutStream ();
// Desctructor.
virtual ~OutStream ();
// Reference counting.
int incRef() { return ++ref; }
int decRef() { return --ref; }
// Close the stream
virtual void close() = 0;
// Return position in stream
virtual int getPos() = 0;
// Put a char in the stream
virtual void put (char c) = 0;
//FIXME
// Printf-like function 2,3 because the first arg is class instance ?
virtual void printf (const char *format, ...) = 0 ; //__attribute__((format(printf, 2,3))) = 0;
private:
int ref; // reference count
};
//------------------------------------------------------------------------
// FileOutStream
//------------------------------------------------------------------------
class FileOutStream : public OutStream {
public:
FileOutStream (FILE* fa, Guint startA);
virtual ~FileOutStream ();
virtual void close();
virtual int getPos();
virtual void put (char c);
virtual void printf (const char *format, ...);
private:
FILE *f;
Guint start;
};
//------------------------------------------------------------------------
// BaseStream
//
// This is the base class for all streams that read directly from a file.
//------------------------------------------------------------------------
class BaseStream: public Stream {
public:
BaseStream(Object *dictA, Guint lengthA);
virtual ~BaseStream();
virtual Stream *makeSubStream(Guint start, GBool limited,
Guint length, Object *dict) = 0;
virtual void setPos(Guint pos, int dir = 0) = 0;
virtual GBool isBinary(GBool last = gTrue) { return last; }
virtual BaseStream *getBaseStream() { return this; }
virtual Stream *getUndecodedStream() { return this; }
virtual Dict *getDict() { return dict.getDict(); }
virtual GooString *getFileName() { return NULL; }
virtual Guint getLength() { return length; }
// Get/set position of first byte of stream within the file.
virtual Guint getStart() = 0;
virtual void moveStart(int delta) = 0;
protected:
Guint length;
private:
Object dict;
};
//------------------------------------------------------------------------
// FilterStream
//
// This is the base class for all streams that filter another stream.
//------------------------------------------------------------------------
class FilterStream: public Stream {
public:
FilterStream(Stream *strA);
virtual ~FilterStream();
virtual void close();
virtual int getPos() { return str->getPos(); }
virtual void setPos(Guint pos, int dir = 0);
virtual BaseStream *getBaseStream() { return str->getBaseStream(); }
virtual Stream *getUndecodedStream() { return str->getUndecodedStream(); }
virtual Dict *getDict() { return str->getDict(); }
virtual Stream *getNextStream() { return str; }
virtual int getUnfilteredChar () { return str->getUnfilteredChar(); }
virtual void unfilteredReset () { str->unfilteredReset(); }
protected:
Stream *str;
};
//------------------------------------------------------------------------
// ImageStream
//------------------------------------------------------------------------
class ImageStream {
public:
// Create an image stream object for an image with the specified
// parameters. Note that these are the actual image parameters,
// which may be different from the predictor parameters.
ImageStream(Stream *strA, int widthA, int nCompsA, int nBitsA);
~ImageStream();
// Reset the stream.
void reset();
// Close the stream previously reset
void close();
// Gets the next pixel from the stream. <pix> should be able to hold
// at least nComps elements. Returns false at end of file.
GBool getPixel(Guchar *pix);
// Returns a pointer to the next line of pixels. Returns NULL at
// end of file.
Guchar *getLine();
// Skip an entire line from the image.
void skipLine();
private:
Stream *str; // base stream
int width; // pixels per line
int nComps; // components per pixel
int nBits; // bits per component
int nVals; // components per line
Guchar *imgLine; // line buffer
int imgIdx; // current index in imgLine
};
//------------------------------------------------------------------------
// StreamPredictor
//------------------------------------------------------------------------
class StreamPredictor {
public:
// Create a predictor object. Note that the parameters are for the
// predictor, and may not match the actual image parameters.
StreamPredictor(Stream *strA, int predictorA,
int widthA, int nCompsA, int nBitsA);
~StreamPredictor();
GBool isOk() { return ok; }
int lookChar();
int getChar();
int getChars(int nChars, Guchar *buffer);
private:
GBool getNextLine();
inline int doGetChar() {
if (predIdx >= rowBytes) {
if (!getNextLine()) {
return EOF;
}
}
return predLine[predIdx++];
}
Stream *str; // base stream
int predictor; // predictor
int width; // pixels per line
int nComps; // components per pixel
int nBits; // bits per component
int nVals; // components per line
int pixBytes; // bytes per pixel
int rowBytes; // bytes per line
Guchar *predLine; // line buffer
int predIdx; // current index in predLine
GBool ok;
};
//------------------------------------------------------------------------
// FileStream
//------------------------------------------------------------------------
#define fileStreamBufSize 256
class FileStream: public BaseStream {
public:
FileStream(FILE *fA, Guint startA, GBool limitedA,
Guint lengthA, Object *dictA);
virtual ~FileStream();
virtual Stream *makeSubStream(Guint startA, GBool limitedA,
Guint lengthA, Object *dictA);
virtual StreamKind getKind() { return strFile; }
virtual void reset();
virtual void close();
virtual int getChar()
{ return doGetChar(); }
virtual int lookChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr & 0xff); }
virtual int getPos() { return bufPos + (bufPtr - buf); }
virtual void setPos(Guint pos, int dir = 0);
virtual Guint getStart() { return start; }
virtual void moveStart(int delta);
virtual int getUnfilteredChar () { return getChar(); }
virtual void unfilteredReset () { reset(); }
private:
GBool fillBuf();
inline int doGetChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); }
virtual GBool hasGetChars() { return true; }
virtual int getChars(int nChars, Guchar *buffer)
{
for (int i = 0; i < nChars; ++i) {
const int c = doGetChar();
if (likely(c != EOF)) buffer[i] = c;
else return i;
}
return nChars;
}
FILE *f;
Guint start;
GBool limited;
char buf[fileStreamBufSize];
char *bufPtr;
char *bufEnd;
Guint bufPos;
int savePos;
GBool saved;
};
//------------------------------------------------------------------------
// CachedFileStream
//------------------------------------------------------------------------
#define cachedStreamBufSize 1024
class CachedFileStream: public BaseStream {
public:
CachedFileStream(CachedFile *ccA, Guint startA, GBool limitedA,
Guint lengthA, Object *dictA);
virtual ~CachedFileStream();
virtual Stream *makeSubStream(Guint startA, GBool limitedA,
Guint lengthA, Object *dictA);
virtual StreamKind getKind() { return strCachedFile; }
virtual void reset();
virtual void close();
virtual int getChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); }
virtual int lookChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr & 0xff); }
virtual int getPos() { return bufPos + (bufPtr - buf); }
virtual void setPos(Guint pos, int dir = 0);
virtual Guint getStart() { return start; }
virtual void moveStart(int delta);
virtual int getUnfilteredChar () { return getChar(); }
virtual void unfilteredReset () { reset(); }
private:
GBool fillBuf();
CachedFile *cc;
Guint start;
GBool limited;
char buf[cachedStreamBufSize];
char *bufPtr;
char *bufEnd;
Guint bufPos;
int savePos;
GBool saved;
};
//------------------------------------------------------------------------
// MemStream
//------------------------------------------------------------------------
class MemStream: public BaseStream {
public:
MemStream(char *bufA, Guint startA, Guint lengthA, Object *dictA);
virtual ~MemStream();
virtual Stream *makeSubStream(Guint start, GBool limited,
Guint lengthA, Object *dictA);
virtual StreamKind getKind() { return strWeird; }
virtual void reset();
virtual void close();
virtual int getChar()
{ return (bufPtr < bufEnd) ? (*bufPtr++ & 0xff) : EOF; }
virtual int lookChar()
{ return (bufPtr < bufEnd) ? (*bufPtr & 0xff) : EOF; }
virtual int getPos() { return (int)(bufPtr - buf); }
virtual void setPos(Guint pos, int dir = 0);
virtual Guint getStart() { return start; }
virtual void moveStart(int delta);
//if needFree = true, the stream will delete buf when it is destroyed
//otherwise it will not touch it. Default value is false
virtual void setNeedFree (GBool val) { needFree = val; }
virtual int getUnfilteredChar () { return getChar(); }
virtual void unfilteredReset () { reset (); }
private:
char *buf;
Guint start;
char *bufEnd;
char *bufPtr;
GBool needFree;
};
//------------------------------------------------------------------------
// EmbedStream
//
// This is a special stream type used for embedded streams (inline
// images). It reads directly from the base stream -- after the
// EmbedStream is deleted, reads from the base stream will proceed where
// the BaseStream left off. Note that this is very different behavior
// that creating a new FileStream (using makeSubStream).
//------------------------------------------------------------------------
class EmbedStream: public BaseStream {
public:
EmbedStream(Stream *strA, Object *dictA, GBool limitedA, Guint lengthA);
virtual ~EmbedStream();
virtual Stream *makeSubStream(Guint start, GBool limitedA,
Guint lengthA, Object *dictA);
virtual StreamKind getKind() { return str->getKind(); }
virtual void reset() {}
virtual int getChar();
virtual int lookChar();
virtual int getPos() { return str->getPos(); }
virtual void setPos(Guint pos, int dir = 0);
virtual Guint getStart();
virtual void moveStart(int delta);
virtual int getUnfilteredChar () { return str->getUnfilteredChar(); }
virtual void unfilteredReset () { str->unfilteredReset(); }
private:
Stream *str;
GBool limited;
};
//------------------------------------------------------------------------
// ASCIIHexStream
//------------------------------------------------------------------------
class ASCIIHexStream: public FilterStream {
public:
ASCIIHexStream(Stream *strA);
virtual ~ASCIIHexStream();
virtual StreamKind getKind() { return strASCIIHex; }
virtual void reset();
virtual int getChar()
{ int c = lookChar(); buf = EOF; return c; }
virtual int lookChar();
virtual GooString *getPSFilter(int psLevel, char *indent);
virtual GBool isBinary(GBool last = gTrue);
private:
int buf;
GBool eof;
};
//------------------------------------------------------------------------
// ASCII85Stream
//------------------------------------------------------------------------
class ASCII85Stream: public FilterStream {
public:
ASCII85Stream(Stream *strA);
virtual ~ASCII85Stream();
virtual StreamKind getKind() { return strASCII85; }
virtual void reset();
virtual int getChar()
{ int ch = lookChar(); ++index; return ch; }
virtual int lookChar();
virtual GooString *getPSFilter(int psLevel, char *indent);
virtual GBool isBinary(GBool last = gTrue);
private:
int c[5];
int b[4];
int index, n;
GBool eof;
};
//------------------------------------------------------------------------
// LZWStream
//------------------------------------------------------------------------
class LZWStream: public FilterStream {
public:
LZWStream(Stream *strA, int predictor, int columns, int colors,
int bits, int earlyA);
virtual ~LZWStream();
virtual StreamKind getKind() { return strLZW; }
virtual void reset();
virtual int getChar();
virtual int lookChar();
virtual int getRawChar();
virtual void getRawChars(int nChars, int *buffer);
virtual GooString *getPSFilter(int psLevel, char *indent);
virtual GBool isBinary(GBool last = gTrue);
private:
inline int doGetRawChar() {
if (eof) {
return EOF;
}
if (seqIndex >= seqLength) {
if (!processNextCode()) {
return EOF;
}
}
return seqBuf[seqIndex++];
}
StreamPredictor *pred; // predictor
int early; // early parameter
GBool eof; // true if at eof
int inputBuf; // input buffer
int inputBits; // number of bits in input buffer
struct { // decoding table
int length;
int head;
Guchar tail;
} table[4097];
int nextCode; // next code to be used
int nextBits; // number of bits in next code word
int prevCode; // previous code used in stream
int newChar; // next char to be added to table
Guchar seqBuf[4097]; // buffer for current sequence
int seqLength; // length of current sequence
int seqIndex; // index into current sequence
GBool first; // first code after a table clear
GBool processNextCode();
void clearTable();
int getCode();
};
//------------------------------------------------------------------------
// RunLengthStream
//------------------------------------------------------------------------
class RunLengthStream: public FilterStream {
public:
RunLengthStream(Stream *strA);
virtual ~RunLengthStream();
virtual StreamKind getKind() { return strRunLength; }
virtual void reset();
virtual int getChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); }
virtual int lookChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr & 0xff); }
virtual GooString *getPSFilter(int psLevel, char *indent);
virtual GBool isBinary(GBool last = gTrue);
private:
char buf[128]; // buffer
char *bufPtr; // next char to read
char *bufEnd; // end of buffer
GBool eof;
GBool fillBuf();
};
//------------------------------------------------------------------------
// CCITTFaxStream
//------------------------------------------------------------------------
struct CCITTCodeTable;
class CCITTFaxStream: public FilterStream {
public:
CCITTFaxStream(Stream *strA, int encodingA, GBool endOfLineA,
GBool byteAlignA, int columnsA, int rowsA,
GBool endOfBlockA, GBool blackA);
virtual ~CCITTFaxStream();
virtual StreamKind getKind() { return strCCITTFax; }
virtual void reset();
virtual int getChar()
{ int c = lookChar(); buf = EOF; return c; }
virtual int lookChar();
virtual GooString *getPSFilter(int psLevel, char *indent);
virtual GBool isBinary(GBool last = gTrue);
virtual void unfilteredReset ();
private:
int encoding; // 'K' parameter
GBool endOfLine; // 'EndOfLine' parameter
GBool byteAlign; // 'EncodedByteAlign' parameter
int columns; // 'Columns' parameter
int rows; // 'Rows' parameter
GBool endOfBlock; // 'EndOfBlock' parameter
GBool black; // 'BlackIs1' parameter
GBool eof; // true if at eof
GBool nextLine2D; // true if next line uses 2D encoding
int row; // current row
int inputBuf; // input buffer
int inputBits; // number of bits in input buffer
int *codingLine; // coding line changing elements
int *refLine; // reference line changing elements
int a0i; // index into codingLine
GBool err; // error on current line
int outputBits; // remaining ouput bits
int buf; // character buffer
void addPixels(int a1, int black);
void addPixelsNeg(int a1, int black);
short getTwoDimCode();
short getWhiteCode();
short getBlackCode();
short lookBits(int n);
void eatBits(int n) { if ((inputBits -= n) < 0) inputBits = 0; }
};
#ifndef ENABLE_LIBJPEG
//------------------------------------------------------------------------
// DCTStream
//------------------------------------------------------------------------
// DCT component info
struct DCTCompInfo {
int id; // component ID
int hSample, vSample; // horiz/vert sampling resolutions
int quantTable; // quantization table number
int prevDC; // DC coefficient accumulator
};
struct DCTScanInfo {
GBool comp[4]; // comp[i] is set if component i is
// included in this scan
int numComps; // number of components in the scan
int dcHuffTable[4]; // DC Huffman table numbers
int acHuffTable[4]; // AC Huffman table numbers
int firstCoeff, lastCoeff; // first and last DCT coefficient
int ah, al; // successive approximation parameters
};
// DCT Huffman decoding table
struct DCTHuffTable {
Guchar firstSym[17]; // first symbol for this bit length
Gushort firstCode[17]; // first code for this bit length
Gushort numCodes[17]; // number of codes of this bit length
Guchar sym[256]; // symbols
};
class DCTStream: public FilterStream {
public:
DCTStream(Stream *strA, int colorXformA);
virtual ~DCTStream();
virtual StreamKind getKind() { return strDCT; }
virtual void reset();
virtual void close();
virtual int getChar();
virtual int lookChar();
virtual GooString *getPSFilter(int psLevel, char *indent);
virtual GBool isBinary(GBool last = gTrue);
Stream *getRawStream() { return str; }
virtual void unfilteredReset();
private:
GBool progressive; // set if in progressive mode
GBool interleaved; // set if in interleaved mode
int width, height; // image size
int mcuWidth, mcuHeight; // size of min coding unit, in data units
int bufWidth, bufHeight; // frameBuf size
DCTCompInfo compInfo[4]; // info for each component
DCTScanInfo scanInfo; // info for the current scan
int numComps; // number of components in image
int colorXform; // color transform: -1 = unspecified
// 0 = none
// 1 = YUV/YUVK -> RGB/CMYK
GBool gotJFIFMarker; // set if APP0 JFIF marker was present
GBool gotAdobeMarker; // set if APP14 Adobe marker was present
int restartInterval; // restart interval, in MCUs
Gushort quantTables[4][64]; // quantization tables
int numQuantTables; // number of quantization tables
DCTHuffTable dcHuffTables[4]; // DC Huffman tables
DCTHuffTable acHuffTables[4]; // AC Huffman tables
int numDCHuffTables; // number of DC Huffman tables
int numACHuffTables; // number of AC Huffman tables
Guchar *rowBuf[4][32]; // buffer for one MCU (non-progressive mode)
int *frameBuf[4]; // buffer for frame (progressive mode)
int comp, x, y, dy; // current position within image/MCU
int restartCtr; // MCUs left until restart
int restartMarker; // next restart marker
int eobRun; // number of EOBs left in the current run
int inputBuf; // input buffer for variable length codes
int inputBits; // number of valid bits in input buffer
void restart();
GBool readMCURow();
void readScan();
GBool readDataUnit(DCTHuffTable *dcHuffTable,
DCTHuffTable *acHuffTable,
int *prevDC, int data[64]);
GBool readProgressiveDataUnit(DCTHuffTable *dcHuffTable,
DCTHuffTable *acHuffTable,
int *prevDC, int data[64]);
void decodeImage();
void transformDataUnit(Gushort *quantTable,
int dataIn[64], Guchar dataOut[64]);
int readHuffSym(DCTHuffTable *table);
int readAmp(int size);
int readBit();
GBool readHeader();
GBool readBaselineSOF();
GBool readProgressiveSOF();
GBool readScanInfo();
GBool readQuantTables();
GBool readHuffmanTables();
GBool readRestartInterval();
GBool readJFIFMarker();
GBool readAdobeMarker();
GBool readTrailer();
int readMarker();
int read16();
};
#endif
#ifndef ENABLE_ZLIB
//------------------------------------------------------------------------
// FlateStream
//------------------------------------------------------------------------
#define flateWindow 32768 // buffer size
#define flateMask (flateWindow-1)
#define flateMaxHuffman 15 // max Huffman code length
#define flateMaxCodeLenCodes 19 // max # code length codes
#define flateMaxLitCodes 288 // max # literal codes
#define flateMaxDistCodes 30 // max # distance codes
// Huffman code table entry
struct FlateCode {
Gushort len; // code length, in bits
Gushort val; // value represented by this code
};
struct FlateHuffmanTab {
FlateCode *codes;
int maxLen;
};
// Decoding info for length and distance code words
struct FlateDecode {
int bits; // # extra bits
int first; // first length/distance
};
class FlateStream: public FilterStream {
public:
FlateStream(Stream *strA, int predictor, int columns,
int colors, int bits);
virtual ~FlateStream();
virtual StreamKind getKind() { return strFlate; }
virtual void reset();
virtual int getChar();
virtual int lookChar();
virtual int getRawChar();
virtual void getRawChars(int nChars, int *buffer);
virtual GooString *getPSFilter(int psLevel, char *indent);
virtual GBool isBinary(GBool last = gTrue);
virtual void unfilteredReset ();
private:
inline int doGetRawChar() {
int c;
while (remain == 0) {
if (endOfBlock && eof)
return EOF;
readSome();
}
c = buf[index];
index = (index + 1) & flateMask;
--remain;
return c;
}
inline int doGetChar() {
if (pred) {
return pred->getChar();
}
return doGetRawChar();
}
virtual GBool hasGetChars() { return true; }
virtual int getChars(int nChars, Guchar *buffer);
StreamPredictor *pred; // predictor
Guchar buf[flateWindow]; // output data buffer
int index; // current index into output buffer
int remain; // number valid bytes in output buffer
int codeBuf; // input buffer
int codeSize; // number of bits in input buffer
int // literal and distance code lengths
codeLengths[flateMaxLitCodes + flateMaxDistCodes];
FlateHuffmanTab litCodeTab; // literal code table
FlateHuffmanTab distCodeTab; // distance code table
GBool compressedBlock; // set if reading a compressed block
int blockLen; // remaining length of uncompressed block
GBool endOfBlock; // set when end of block is reached
GBool eof; // set when end of stream is reached
static int // code length code reordering
codeLenCodeMap[flateMaxCodeLenCodes];
static FlateDecode // length decoding info
lengthDecode[flateMaxLitCodes-257];
static FlateDecode // distance decoding info
distDecode[flateMaxDistCodes];
static FlateHuffmanTab // fixed literal code table
fixedLitCodeTab;
static FlateHuffmanTab // fixed distance code table
fixedDistCodeTab;
void readSome();
GBool startBlock();
void loadFixedCodes();
GBool readDynamicCodes();
void compHuffmanCodes(int *lengths, int n, FlateHuffmanTab *tab);
int getHuffmanCodeWord(FlateHuffmanTab *tab);
int getCodeWord(int bits);
};
#endif
//------------------------------------------------------------------------
// EOFStream
//------------------------------------------------------------------------
class EOFStream: public FilterStream {
public:
EOFStream(Stream *strA);
virtual ~EOFStream();
virtual StreamKind getKind() { return strWeird; }
virtual void reset() {}
virtual int getChar() { return EOF; }
virtual int lookChar() { return EOF; }
virtual GooString *getPSFilter(int /*psLevel*/, char * /*indent*/) { return NULL; }
virtual GBool isBinary(GBool /*last = gTrue*/) { return gFalse; }
};
//------------------------------------------------------------------------
// FixedLengthEncoder
//------------------------------------------------------------------------
class FixedLengthEncoder: public FilterStream {
public:
FixedLengthEncoder(Stream *strA, int lengthA);
~FixedLengthEncoder();
virtual StreamKind getKind() { return strWeird; }
virtual void reset();
virtual int getChar();
virtual int lookChar();
virtual GooString *getPSFilter(int /*psLevel*/, char * /*indent*/) { return NULL; }
virtual GBool isBinary(GBool /*last = gTrue*/);
virtual GBool isEncoder() { return gTrue; }
private:
int length;
int count;
};
//------------------------------------------------------------------------
// ASCIIHexEncoder
//------------------------------------------------------------------------
class ASCIIHexEncoder: public FilterStream {
public:
ASCIIHexEncoder(Stream *strA);
virtual ~ASCIIHexEncoder();
virtual StreamKind getKind() { return strWeird; }
virtual void reset();
virtual int getChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); }
virtual int lookChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr & 0xff); }
virtual GooString *getPSFilter(int /*psLevel*/, char * /*indent*/) { return NULL; }
virtual GBool isBinary(GBool /*last = gTrue*/) { return gFalse; }
virtual GBool isEncoder() { return gTrue; }
private:
char buf[4];
char *bufPtr;
char *bufEnd;
int lineLen;
GBool eof;
GBool fillBuf();
};
//------------------------------------------------------------------------
// ASCII85Encoder
//------------------------------------------------------------------------
class ASCII85Encoder: public FilterStream {
public:
ASCII85Encoder(Stream *strA);
virtual ~ASCII85Encoder();
virtual StreamKind getKind() { return strWeird; }
virtual void reset();
virtual int getChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); }
virtual int lookChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr & 0xff); }
virtual GooString *getPSFilter(int /*psLevel*/, char * /*indent*/) { return NULL; }
virtual GBool isBinary(GBool /*last = gTrue*/) { return gFalse; }
virtual GBool isEncoder() { return gTrue; }
private:
char buf[8];
char *bufPtr;
char *bufEnd;
int lineLen;
GBool eof;
GBool fillBuf();
};
//------------------------------------------------------------------------
// RunLengthEncoder
//------------------------------------------------------------------------
class RunLengthEncoder: public FilterStream {
public:
RunLengthEncoder(Stream *strA);
virtual ~RunLengthEncoder();
virtual StreamKind getKind() { return strWeird; }
virtual void reset();
virtual int getChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); }
virtual int lookChar()
{ return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr & 0xff); }
virtual GooString *getPSFilter(int /*psLevel*/, char * /*indent*/) { return NULL; }
virtual GBool isBinary(GBool /*last = gTrue*/) { return gTrue; }
virtual GBool isEncoder() { return gTrue; }
private:
char buf[131];
char *bufPtr;
char *bufEnd;
char *nextEnd;
GBool eof;
GBool fillBuf();
};
#endif
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