Implement Pl_DCT pipeline

Additional testing is added in later commits to be supported by
additional changes in the library.

1 files changed, 70 insertions, 0 deletions

diff --git a/include/qpdf/Pl_DCT.hh b/include/qpdf/Pl_DCT.hh
new file mode 100644
index 00000000..b7415394
--- /dev/null
+++ b/include/qpdf/Pl_DCT.hh
@@ -0,0 +1,70 @@
+// Copyright (c) 2005-2015 Jay Berkenbilt
+//
+// This file is part of qpdf.  This software may be distributed under
+// the terms of version 2 of the Artistic License which may be found
+// in the source distribution.  It is provided "as is" without express
+// or implied warranty.
+
+#ifndef __PL_DCT_HH__
+#define __PL_DCT_HH__
+
+#include <qpdf/Pipeline.hh>
+#include <qpdf/Pl_Buffer.hh>
+#include <jpeglib.h>
+
+class Pl_DCT: public Pipeline
+{
+  public:
+    // Constructor for decompressing image data
+    QPDF_DLL
+    Pl_DCT(char const* identifier, Pipeline* next);
+
+    class CompressConfig
+    {
+      public:
+        CompressConfig()
+        {
+        }
+        virtual ~CompressConfig()
+        {
+        }
+        virtual void apply(jpeg_compress_struct*) = 0;
+    };
+
+    // Constructor for compressing image data
+    QPDF_DLL
+    Pl_DCT(char const* identifier, Pipeline* next,
+           JDIMENSION image_width,
+           JDIMENSION image_height,
+           int components,
+           J_COLOR_SPACE color_space,
+           CompressConfig* config_callback = 0);
+
+    QPDF_DLL
+    virtual ~Pl_DCT();
+
+    QPDF_DLL
+    virtual void write(unsigned char* data, size_t len);
+    QPDF_DLL
+    virtual void finish();
+
+  private:
+    void compress(void* cinfo, PointerHolder<Buffer>);
+    void decompress(void* cinfo, PointerHolder<Buffer>);
+
+    enum action_e { a_compress, a_decompress };
+
+    action_e action;
+    Pl_Buffer buf;
+
+    // Used for compression
+    JDIMENSION image_width;
+    JDIMENSION image_height;
+    int components;
+    J_COLOR_SPACE color_space;
+
+    CompressConfig* config_callback;
+
+};
+
+#endif // __PL_DCT_HH__