Add Pl_TIFFPredictor

1 files changed, 39 insertions, 0 deletions

diff --git a/libqpdf/qpdf/Pl_TIFFPredictor.hh b/libqpdf/qpdf/Pl_TIFFPredictor.hh
new file mode 100644
index 00000000..235068ee
--- /dev/null
+++ b/libqpdf/qpdf/Pl_TIFFPredictor.hh
@@ -0,0 +1,39 @@
+#ifndef __PL_TIFFPREDICTOR_HH__
+#define __PL_TIFFPREDICTOR_HH__
+
+// This pipeline reverses the application of a TIFF predictor as
+// described in the TIFF specification.
+
+#include <qpdf/Pipeline.hh>
+
+class Pl_TIFFPredictor: public Pipeline
+{
+  public:
+    enum action_e { a_encode, a_decode };
+
+    QPDF_DLL
+    Pl_TIFFPredictor(char const* identifier, Pipeline* next,
+                     action_e action, unsigned int columns,
+                     unsigned int samples_per_pixel = 1,
+                     unsigned int bits_per_sample = 8);
+    QPDF_DLL
+    virtual ~Pl_TIFFPredictor();
+
+    QPDF_DLL
+    virtual void write(unsigned char* data, size_t len);
+    QPDF_DLL
+    virtual void finish();
+
+  private:
+    void processRow();
+
+    action_e action;
+    unsigned int columns;
+    unsigned int bytes_per_row;
+    unsigned int samples_per_pixel;
+    unsigned int bits_per_sample;
+    unsigned char* cur_row;
+    size_t pos;
+};
+
+#endif // __PL_TIFFPREDICTOR_HH__