+ Decrypt *decrypt;
+#endif
+
+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 Dict *getDict() { return str->getDict(); }
+ virtual void ignoreLength() { str->ignoreLength(); }
+
+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();
+
+ int lookChar();
+ int getChar();
+
+private:
+
+ GBool getNextLine();
+
+ Stream *str; // base stream