X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=blobdiff_plain;f=pdf%2Fxpdf%2FStream.h;h=e4c70c9db8be36422dc5ee40f41ba420f0249714;hb=e4328aef245464741c6d742bfc5aef4ee579ef23;hp=409d2ae495e5e88ffb3ba2927bddff8857545710;hpb=d9f9a6449f377b4c933b75d57541b19c6d088994;p=evince.git diff --git a/pdf/xpdf/Stream.h b/pdf/xpdf/Stream.h index 409d2ae4..e4c70c9d 100644 --- a/pdf/xpdf/Stream.h +++ b/pdf/xpdf/Stream.h @@ -17,6 +17,8 @@ #include "gtypes.h" #include "Object.h" +class BaseStream; + //------------------------------------------------------------------------ enum StreamKind { @@ -54,33 +56,24 @@ public: // Reset stream to beginning. virtual void reset() = 0; - // Reset stream and allocate buffers for use by getPixel(). - // The image has pixels per line, components per - // pixel, and bits per component. - virtual void resetImage(int width1, int nComps1, int nBits1); - // 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); - // Gets the next pixel from the stream. (resetImage() must be called - // first.) should be able to hold at least nComps elements. - // Returns false at end of file. - virtual GBool getImagePixel(Guchar *pix); - - // Skip an entire line from the image. - virtual void skipImageLine(); - // Get current position in file. virtual int getPos() = 0; // Go to a position in the stream. - virtual void setPos(int pos1); + virtual void setPos(int pos1) = 0; // Get PostScript command for the filter(s). virtual GString *getPSFilter(char *indent); @@ -88,11 +81,8 @@ public: // Does this stream type potentially contain non-printable chars? virtual GBool isBinary(GBool last = gTrue) = 0; - // Get the base FileStream or SubStream of this stream. - virtual Stream *getBaseStream() = 0; - - // Get the base file of this stream. - virtual FILE *getFile() = 0; + // Get the BaseStream or EmbedStream of this stream. + virtual BaseStream *getBaseStream() = 0; // Get the dictionary associated with this stream. virtual Dict *getDict() = 0; @@ -109,10 +99,111 @@ 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 *dict); + virtual ~BaseStream(); + virtual Stream *makeSubStream(int start, int length, Object *dict) = 0; + virtual void setPos(int pos1) = 0; + virtual BaseStream *getBaseStream() { return this; } + virtual Dict *getDict() { return dict.getDict(); } + + // Get/set position of first byte of stream within the file. + virtual int 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 *str); + virtual ~FilterStream(); + virtual int getPos() { return str->getPos(); } + virtual void setPos(int pos); + virtual BaseStream *getBaseStream() { return str->getBaseStream(); } + virtual Dict *getDict() { return str->getDict(); } protected: - //----- image stuff + 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 *str, int width, int nComps, int nBits); + + ~ImageStream(); + + // Reset the stream. + void reset(); + + // Gets the next pixel from the stream. should be able to hold + // at least nComps elements. Returns false at end of file. + GBool getPixel(Guchar *pix); + + // 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 *str, int predictor, + int width, int nComps, int nBits); + + ~StreamPredictor(); + + int lookChar(); + int getChar(); + +private: + + GBool getNextLine(); + + Stream *str; // base stream int predictor; // predictor int width; // pixels per line int nComps; // components per pixel @@ -120,20 +211,20 @@ protected: int nVals; // components per line int pixBytes; // bytes per pixel int rowBytes; // bytes per line - Guchar *rawLine; // raw line buffer - Guchar *pixLine; // pixel line buffer - int pixIdx; // current index in line buffer + Guchar *predLine; // line buffer + int predIdx; // current index in predLine }; //------------------------------------------------------------------------ // FileStream //------------------------------------------------------------------------ -class FileStream: public Stream { +class FileStream: public BaseStream { public: - FileStream(FILE *f1, int start1, int length1, Object *dict1); + FileStream(FILE *f, int start, int length, Object *dict); virtual ~FileStream(); + virtual Stream *makeSubStream(int start, int length, Object *dict); virtual StreamKind getKind() { return strFile; } virtual void reset(); virtual int getChar() @@ -143,16 +234,8 @@ public: virtual int getPos() { return bufPos + (bufPtr - buf); } virtual void setPos(int pos1); virtual GBool isBinary(GBool last = gTrue) { return last; } - virtual Stream *getBaseStream() { return this; } - virtual FILE *getFile() { return f; } - virtual Dict *getDict() { return dict.getDict(); } - - // Check for a PDF header on this stream. Skip past some garbage - // if necessary. - GBool checkHeader(); - - // Get position of first byte of stream within the file. - int getStart() { return start; } + virtual int getStart() { return start; } + virtual void moveStart(int delta); private: @@ -166,58 +249,58 @@ private: char *bufEnd; int bufPos; int savePos; - Object dict; }; //------------------------------------------------------------------------ -// SubStream +// 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 SubStream: public Stream { +class EmbedStream: public BaseStream { public: - SubStream(Stream *str1, Object *dict1); - virtual ~SubStream(); + EmbedStream(Stream *str, Object *dict); + virtual ~EmbedStream(); + virtual Stream *makeSubStream(int start, int length, Object *dict); virtual StreamKind getKind() { return str->getKind(); } virtual void reset() {} virtual int getChar() { return str->getChar(); } virtual int lookChar() { return str->lookChar(); } virtual int getPos() { return str->getPos(); } + virtual void setPos(int pos); virtual GBool isBinary(GBool last = gTrue) { return last; } - virtual Stream *getBaseStream() { return this; } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return dict.getDict(); } + virtual int getStart(); + virtual void moveStart(int delta); private: Stream *str; - Object dict; }; //------------------------------------------------------------------------ // ASCIIHexStream //------------------------------------------------------------------------ -class ASCIIHexStream: public Stream { +class ASCIIHexStream: public FilterStream { public: - ASCIIHexStream(Stream *str1); + ASCIIHexStream(Stream *str); virtual ~ASCIIHexStream(); virtual StreamKind getKind() { return strASCIIHex; } virtual void reset(); virtual int getChar() { int c = lookChar(); buf = EOF; return c; } virtual int lookChar(); - virtual int getPos() { return str->getPos(); } virtual GString *getPSFilter(char *indent); virtual GBool isBinary(GBool last = gTrue); - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } private: - Stream *str; int buf; GBool eof; }; @@ -226,26 +309,21 @@ private: // ASCII85Stream //------------------------------------------------------------------------ -class ASCII85Stream: public Stream { +class ASCII85Stream: public FilterStream { public: - ASCII85Stream(Stream *str1); + ASCII85Stream(Stream *str); virtual ~ASCII85Stream(); virtual StreamKind getKind() { return strASCII85; } virtual void reset(); virtual int getChar() { int ch = lookChar(); ++index; return ch; } virtual int lookChar(); - virtual int getPos() { return str->getPos(); } virtual GString *getPSFilter(char *indent); virtual GBool isBinary(GBool last = gTrue); - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } private: - Stream *str; int c[5]; int b[4]; int index, n; @@ -256,26 +334,23 @@ private: // LZWStream //------------------------------------------------------------------------ -class LZWStream: public Stream { +class LZWStream: public FilterStream { public: - LZWStream(Stream *str1, int predictor1, int columns1, int colors1, + LZWStream(Stream *str, int predictor1, int columns1, int colors1, int bits1, int early1); virtual ~LZWStream(); virtual StreamKind getKind() { return strLZW; } virtual void reset(); virtual int getChar(); virtual int lookChar(); - virtual int getPos() { return str->getPos(); } + virtual int getRawChar(); virtual GString *getPSFilter(char *indent); virtual GBool isBinary(GBool last = gTrue); - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } private: - Stream *str; // stream + StreamPredictor *pred; // predictor int early; // early parameter char zCmd[256]; // uncompress command FILE *zPipe; // uncompress pipe @@ -296,10 +371,10 @@ private: // RunLengthStream //------------------------------------------------------------------------ -class RunLengthStream: public Stream { +class RunLengthStream: public FilterStream { public: - RunLengthStream(Stream *str1); + RunLengthStream(Stream *str); virtual ~RunLengthStream(); virtual StreamKind getKind() { return strRunLength; } virtual void reset(); @@ -307,16 +382,11 @@ public: { return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); } virtual int lookChar() { return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr & 0xff); } - virtual int getPos() { return str->getPos(); } virtual GString *getPSFilter(char *indent); virtual GBool isBinary(GBool last = gTrue); - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } private: - Stream *str; char buf[128]; // buffer char *bufPtr; // next char to read char *bufEnd; // end of buffer @@ -331,34 +401,33 @@ private: struct CCITTCodeTable; -class CCITTFaxStream: public Stream { +class CCITTFaxStream: public FilterStream { public: - CCITTFaxStream(Stream *str1, int encoding1, GBool byteAlign1, - int columns1, int rows1, GBool black1); + CCITTFaxStream(Stream *str, int encoding, GBool endOfLine, + GBool byteAlign, int columns, int rows, + GBool endOfBlock, GBool black); virtual ~CCITTFaxStream(); virtual StreamKind getKind() { return strCCITTFax; } virtual void reset(); virtual int getChar() { int c = lookChar(); buf = EOF; return c; } virtual int lookChar(); - virtual int getPos() { return str->getPos(); } virtual GString *getPSFilter(char *indent); virtual GBool isBinary(GBool last = gTrue); - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } private: - Stream *str; // stream 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 short *refLine; // reference line changing elements @@ -371,8 +440,8 @@ private: short getTwoDimCode(); short getWhiteCode(); short getBlackCode(); - short look13Bits(); - void eatBits(int bits) { inputBits -= bits; } + short lookBits(int n); + void eatBits(int n) { inputBits -= n; } }; //------------------------------------------------------------------------ @@ -397,31 +466,27 @@ struct DCTHuffTable { Guchar sym[256]; // symbols }; -class DCTStream: public Stream { +class DCTStream: public FilterStream { public: - DCTStream(Stream *str1); + DCTStream(Stream *str); virtual ~DCTStream(); virtual StreamKind getKind() { return strDCT; } virtual void reset(); virtual int getChar(); virtual int lookChar(); - virtual int getPos() { return str->getPos(); } virtual GString *getPSFilter(char *indent); virtual GBool isBinary(GBool last = gTrue); - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } Stream *getRawStream() { return str; } private: - Stream *str; // stream int width, height; // image size int mcuWidth, mcuHeight; // size of min coding unit, in data units DCTCompInfo compInfo[4]; // info for each component int numComps; // number of components in image int colorXform; // need YCbCr-to-RGB transform? + GBool gotAdobeMarker; // set if APP14 Adobe marker was present int restartInterval; // restart interval, in MCUs Guchar quantTables[4][64]; // quantization tables int numQuantTables; // number of quantization tables @@ -485,26 +550,23 @@ struct FlateDecode { int first; // first length/distance }; -class FlateStream: public Stream { +class FlateStream: public FilterStream { public: - FlateStream(Stream *str1, int predictor1, int columns1, + FlateStream(Stream *str, int predictor1, int columns1, int colors1, int bits1); virtual ~FlateStream(); virtual StreamKind getKind() { return strFlate; } virtual void reset(); virtual int getChar(); virtual int lookChar(); - virtual int getPos() { return str->getPos(); } + virtual int getRawChar(); virtual GString *getPSFilter(char *indent); virtual GBool isBinary(GBool last = gTrue); - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } private: - Stream *str; // stream + StreamPredictor *pred; // predictor Guchar buf[flateWindow]; // output data buffer int index; // current index into output buffer int remain; // number valid bytes in output buffer @@ -539,51 +601,38 @@ private: // EOFStream //------------------------------------------------------------------------ -class EOFStream: public Stream { +class EOFStream: public FilterStream { public: - EOFStream(Stream *str1); + EOFStream(Stream *str); virtual ~EOFStream(); virtual StreamKind getKind() { return strWeird; } virtual void reset() {} virtual int getChar() { return EOF; } virtual int lookChar() { return EOF; } - virtual int getPos() { return str->getPos(); } virtual GString *getPSFilter(char *indent) { return NULL; } virtual GBool isBinary(GBool last = gTrue) { return gFalse; } - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } - -private: - - Stream *str; }; //------------------------------------------------------------------------ // FixedLengthEncoder //------------------------------------------------------------------------ -class FixedLengthEncoder: public Stream { +class FixedLengthEncoder: public FilterStream { public: - FixedLengthEncoder(Stream *str1, int length1); + FixedLengthEncoder(Stream *str, int length1); ~FixedLengthEncoder(); virtual StreamKind getKind() { return strWeird; } virtual void reset(); virtual int getChar(); virtual int lookChar(); - virtual int getPos() { return str->getPos(); } virtual GString *getPSFilter(char *indent) { return NULL; } virtual GBool isBinary(GBool last = gTrue) { return gFalse; } - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } virtual GBool isEncoder() { return gTrue; } private: - Stream *str; int length; int count; }; @@ -592,10 +641,10 @@ private: // ASCII85Encoder //------------------------------------------------------------------------ -class ASCII85Encoder: public Stream { +class ASCII85Encoder: public FilterStream { public: - ASCII85Encoder(Stream *str1); + ASCII85Encoder(Stream *str); virtual ~ASCII85Encoder(); virtual StreamKind getKind() { return strWeird; } virtual void reset(); @@ -603,17 +652,12 @@ public: { return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); } virtual int lookChar() { return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr & 0xff); } - virtual int getPos() { return str->getPos(); } virtual GString *getPSFilter(char *indent) { return NULL; } virtual GBool isBinary(GBool last = gTrue) { return gFalse; } - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } virtual GBool isEncoder() { return gTrue; } private: - Stream *str; char buf[8]; char *bufPtr; char *bufEnd; @@ -627,10 +671,10 @@ private: // RunLengthEncoder //------------------------------------------------------------------------ -class RunLengthEncoder: public Stream { +class RunLengthEncoder: public FilterStream { public: - RunLengthEncoder(Stream *str1); + RunLengthEncoder(Stream *str); virtual ~RunLengthEncoder(); virtual StreamKind getKind() { return strWeird; } virtual void reset(); @@ -638,17 +682,12 @@ public: { return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); } virtual int lookChar() { return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr & 0xff); } - virtual int getPos() { return str->getPos(); } virtual GString *getPSFilter(char *indent) { return NULL; } virtual GBool isBinary(GBool last = gTrue) { return gFalse; } - virtual Stream *getBaseStream() { return str->getBaseStream(); } - virtual FILE *getFile() { return str->getFile(); } - virtual Dict *getDict() { return str->getDict(); } virtual GBool isEncoder() { return gTrue; } private: - Stream *str; char buf[131]; char *bufPtr; char *bufEnd;