#include "gtypes.h"
#include "Object.h"
+class BaseStream;
+
//------------------------------------------------------------------------
enum StreamKind {
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);
// 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;
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:
+
+ Stream *str;
+};
+
//------------------------------------------------------------------------
// ImageStream
//------------------------------------------------------------------------
// 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()
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:
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;
};
// 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;
// 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 int getChar();
virtual int lookChar();
virtual int getRawChar();
- 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
StreamPredictor *pred; // predictor
int early; // early parameter
char zCmd[256]; // uncompress command
// 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();
{ 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
struct CCITTCodeTable;
-class CCITTFaxStream: public Stream {
+class CCITTFaxStream: public FilterStream {
public:
CCITTFaxStream(Stream *str, int encoding, GBool endOfLine,
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
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 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 int getChar();
virtual int lookChar();
virtual int getRawChar();
- 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
StreamPredictor *pred; // predictor
Guchar buf[flateWindow]; // output data buffer
int index; // current index into output buffer
// 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;
};
// 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();
{ 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;
// 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();
{ 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;
https://www.fi.muni.cz/~kas/git / evince.git / blobdiff