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+//========================================================================
+//
+// Stream.h
+//
+// Copyright 1996-2003 Glyph & Cog, LLC
+//
+//========================================================================
+
+#ifndef STREAM_H
+#define STREAM_H
+
+#include <aconf.h>
+
+#ifdef USE_GCC_PRAGMAS
+#pragma interface
+#endif
+
+#include <stdio.h>
+#include "gtypes.h"
+#include "Object.h"
+
+class BaseStream;
+
+//------------------------------------------------------------------------
+
+enum StreamKind {
+ strFile,
+ 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
+};
+
+//------------------------------------------------------------------------
+// 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();
+
+ // 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();
+
+ // 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 GString *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:
+
+ Stream *makeFilter(char *name, Stream *str, Object *params);
+
+ int ref; // reference count
+};
+
+//------------------------------------------------------------------------
+// BaseStream
+//
+// This is the base class for all streams that read directly from a file.
+//------------------------------------------------------------------------
+
+class BaseStream: public Stream {
+public:
+
+ BaseStream(Object *dictA);
+ 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 GString *getFileName() { return NULL; }
+
+ // Get/set position of first byte of stream within the file.
+ virtual Guint getStart() = 0;
+ virtual void moveStart(int delta) = 0;
+
+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; }
+
+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();
+
+ // 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();
+
+private:
+
+ GBool getNextLine();
+
+ 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 (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);
+
+private:
+
+ GBool fillBuf();
+
+ FILE *f;
+ Guint start;
+ GBool limited;
+ Guint length;
+ char buf[fileStreamBufSize];
+ 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);
+
+private:
+
+ char *buf;
+ Guint start;
+ Guint length;
+ 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);
+
+private:
+
+ Stream *str;
+ GBool limited;
+ Guint length;
+};
+
+//------------------------------------------------------------------------
+// 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 GString *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 GString *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 GString *getPSFilter(int psLevel, char *indent);
+ virtual GBool isBinary(GBool last = gTrue);
+
+private:
+
+ 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 GString *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 GString *getPSFilter(int psLevel, char *indent);
+ virtual GBool isBinary(GBool last = gTrue);
+
+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; }
+};
+
+//------------------------------------------------------------------------
+// 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 GString *getPSFilter(int psLevel, char *indent);
+ virtual GBool isBinary(GBool last = gTrue);
+ Stream *getRawStream() { return str; }
+
+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();
+};
+
+//------------------------------------------------------------------------
+// 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 GString *getPSFilter(int psLevel, char *indent);
+ virtual GBool isBinary(GBool last = gTrue);
+
+private:
+
+ 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);
+};
+
+//------------------------------------------------------------------------
+// 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 GString *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 GString *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 GString *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 GString *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 GString *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
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-19 03:51:10 +0000