diff --git a/common/rfb/Decoder.cxx b/common/rfb/Decoder.cxx
index e201821..9982c93 100644
--- a/common/rfb/Decoder.cxx
+++ b/common/rfb/Decoder.cxx
@@ -27,6 +27,10 @@
 
 using namespace rfb;
 
+Decoder::Decoder(CMsgReader* reader_) : reader(reader_)
+{
+}
+
 Decoder::~Decoder()
 {
 }
diff --git a/common/rfb/Decoder.h b/common/rfb/Decoder.h
index 025d63f..842491f 100644
--- a/common/rfb/Decoder.h
+++ b/common/rfb/Decoder.h
@@ -27,11 +27,14 @@
 
   class Decoder {
   public:
+    Decoder(CMsgReader* reader);
     virtual ~Decoder();
     virtual void readRect(const Rect& r, CMsgHandler* handler)=0;
 
     static bool supported(int encoding);
     static Decoder* createDecoder(int encoding, CMsgReader* reader);
+  protected:
+    CMsgReader* reader;
   };
 }
 
diff --git a/common/rfb/Encoder.cxx b/common/rfb/Encoder.cxx
index 1733c8e..6b2321c 100644
--- a/common/rfb/Encoder.cxx
+++ b/common/rfb/Encoder.cxx
@@ -25,9 +25,14 @@
 #include <rfb/HextileEncoder.h>
 #include <rfb/ZRLEEncoder.h>
 #include <rfb/TightEncoder.h>
+#include <rfb/SMsgWriter.h>
 
 using namespace rfb;
 
+Encoder::Encoder(SMsgWriter* writer_) : writer(writer_)
+{
+}
+
 Encoder::~Encoder()
 {
 }
diff --git a/common/rfb/Encoder.h b/common/rfb/Encoder.h
index 8712c09..485b850 100644
--- a/common/rfb/Encoder.h
+++ b/common/rfb/Encoder.h
@@ -29,6 +29,7 @@
 
   class Encoder {
   public:
+    Encoder(SMsgWriter* writer);
     virtual ~Encoder();
 
     virtual void setCompressLevel(int level) {};
@@ -43,6 +44,9 @@
 
     static bool supported(int encoding);
     static Encoder* createEncoder(int encoding, SMsgWriter* writer);
+
+  protected:
+    SMsgWriter* writer;
   };
 }
 
diff --git a/common/rfb/HextileDecoder.cxx b/common/rfb/HextileDecoder.cxx
index ae61267..04ef956 100644
--- a/common/rfb/HextileDecoder.cxx
+++ b/common/rfb/HextileDecoder.cxx
@@ -34,7 +34,7 @@
 #include <rfb/hextileDecode.h>
 #undef BPP
 
-HextileDecoder::HextileDecoder(CMsgReader* reader_) : reader(reader_)
+HextileDecoder::HextileDecoder(CMsgReader* reader) : Decoder(reader)
 {
 }
 
diff --git a/common/rfb/HextileDecoder.h b/common/rfb/HextileDecoder.h
index 95a7f8a..287b49d 100644
--- a/common/rfb/HextileDecoder.h
+++ b/common/rfb/HextileDecoder.h
@@ -27,8 +27,6 @@
     HextileDecoder(CMsgReader* reader);
     virtual ~HextileDecoder();
     virtual void readRect(const Rect& r, CMsgHandler* handler);
-  private:
-    CMsgReader* reader;
   };
 }
 #endif
diff --git a/common/rfb/HextileEncoder.cxx b/common/rfb/HextileEncoder.cxx
index 19fb1a3..c31e608 100644
--- a/common/rfb/HextileEncoder.cxx
+++ b/common/rfb/HextileEncoder.cxx
@@ -45,7 +45,7 @@
 #include <rfb/hextileEncodeBetter.h>
 #undef BPP
 
-HextileEncoder::HextileEncoder(SMsgWriter* writer_) : writer(writer_)
+HextileEncoder::HextileEncoder(SMsgWriter* writer_) : Encoder(writer_)
 {
 }
 
diff --git a/common/rfb/HextileEncoder.h b/common/rfb/HextileEncoder.h
index 5540c64..705cbc6 100644
--- a/common/rfb/HextileEncoder.h
+++ b/common/rfb/HextileEncoder.h
@@ -27,8 +27,6 @@
     HextileEncoder(SMsgWriter* writer);
     virtual ~HextileEncoder();
     virtual void writeRect(const Rect& r, TransImageGetter* ig);
-  private:
-    SMsgWriter* writer;
   };
 }
 #endif
diff --git a/common/rfb/RREDecoder.cxx b/common/rfb/RREDecoder.cxx
index b81a4a8..97d7a71 100644
--- a/common/rfb/RREDecoder.cxx
+++ b/common/rfb/RREDecoder.cxx
@@ -34,7 +34,7 @@
 #include <rfb/rreDecode.h>
 #undef BPP
 
-RREDecoder::RREDecoder(CMsgReader* reader_) : reader(reader_)
+RREDecoder::RREDecoder(CMsgReader* reader) : Decoder(reader)
 {
 }
 
diff --git a/common/rfb/RREDecoder.h b/common/rfb/RREDecoder.h
index 98abf98..bee634f 100644
--- a/common/rfb/RREDecoder.h
+++ b/common/rfb/RREDecoder.h
@@ -27,8 +27,6 @@
     RREDecoder(CMsgReader* reader);
     virtual ~RREDecoder();
     virtual void readRect(const Rect& r, CMsgHandler* handler);
-  private:
-    CMsgReader* reader;
   };
 }
 #endif
diff --git a/common/rfb/RREEncoder.cxx b/common/rfb/RREEncoder.cxx
index 09702cf..b37b758 100644
--- a/common/rfb/RREEncoder.cxx
+++ b/common/rfb/RREEncoder.cxx
@@ -33,7 +33,7 @@
 #include <rfb/rreEncode.h>
 #undef BPP
 
-RREEncoder::RREEncoder(SMsgWriter* writer_) : writer(writer_)
+RREEncoder::RREEncoder(SMsgWriter* writer) : Encoder(writer)
 {
 }
 
diff --git a/common/rfb/RREEncoder.h b/common/rfb/RREEncoder.h
index 4b990f5..c5e6556 100644
--- a/common/rfb/RREEncoder.h
+++ b/common/rfb/RREEncoder.h
@@ -29,7 +29,6 @@
     virtual ~RREEncoder();
     virtual void writeRect(const Rect& r, TransImageGetter* ig);
   private:
-    SMsgWriter* writer;
     rdr::MemOutStream mos;
   };
 }
diff --git a/common/rfb/RawDecoder.cxx b/common/rfb/RawDecoder.cxx
index 5fd3b7c..eab92e5 100644
--- a/common/rfb/RawDecoder.cxx
+++ b/common/rfb/RawDecoder.cxx
@@ -22,7 +22,7 @@
 
 using namespace rfb;
 
-RawDecoder::RawDecoder(CMsgReader* reader_) : reader(reader_)
+RawDecoder::RawDecoder(CMsgReader* reader) : Decoder(reader)
 {
 }
 
diff --git a/common/rfb/RawDecoder.h b/common/rfb/RawDecoder.h
index e09cca2..9d0dc30 100644
--- a/common/rfb/RawDecoder.h
+++ b/common/rfb/RawDecoder.h
@@ -27,8 +27,6 @@
     RawDecoder(CMsgReader* reader);
     virtual ~RawDecoder();
     virtual void readRect(const Rect& r, CMsgHandler* handler);
-  private:
-    CMsgReader* reader;
   };
 }
 #endif
diff --git a/common/rfb/RawEncoder.cxx b/common/rfb/RawEncoder.cxx
index b4e38db..2fc5741 100644
--- a/common/rfb/RawEncoder.cxx
+++ b/common/rfb/RawEncoder.cxx
@@ -23,7 +23,7 @@
 
 using namespace rfb;
 
-RawEncoder::RawEncoder(SMsgWriter* writer_) : writer(writer_)
+RawEncoder::RawEncoder(SMsgWriter* writer) : Encoder(writer)
 {
 }
 
diff --git a/common/rfb/RawEncoder.h b/common/rfb/RawEncoder.h
index 628f32f..42d3850 100644
--- a/common/rfb/RawEncoder.h
+++ b/common/rfb/RawEncoder.h
@@ -27,8 +27,6 @@
     RawEncoder(SMsgWriter* writer);
     virtual ~RawEncoder();
     virtual void writeRect(const Rect& r, TransImageGetter* ig);
-  private:
-    SMsgWriter* writer;
   };
 }
 #endif
diff --git a/common/rfb/TightDecoder.cxx b/common/rfb/TightDecoder.cxx
index d4ee877..83e84f7 100644
--- a/common/rfb/TightDecoder.cxx
+++ b/common/rfb/TightDecoder.cxx
@@ -37,7 +37,7 @@
 #include <rfb/tightDecode.h>
 #undef BPP
 
-TightDecoder::TightDecoder(CMsgReader* reader_) : reader(reader_)
+TightDecoder::TightDecoder(CMsgReader* reader) : Decoder(reader)
 {
 }
 
diff --git a/common/rfb/TightDecoder.h b/common/rfb/TightDecoder.h
index 8200d2b..0b915f9 100644
--- a/common/rfb/TightDecoder.h
+++ b/common/rfb/TightDecoder.h
@@ -54,7 +54,6 @@
     void directFillRect16(const Rect& r, Pixel pix);
     void directFillRect32(const Rect& r, Pixel pix);
 
-    CMsgReader* reader;
     CMsgHandler* handler;
     rdr::InStream* is;
     rdr::ZlibInStream zis[4];
diff --git a/common/rfb/TightEncoder.cxx b/common/rfb/TightEncoder.cxx
index f4633f8..622dc3d 100644
--- a/common/rfb/TightEncoder.cxx
+++ b/common/rfb/TightEncoder.cxx
@@ -93,7 +93,7 @@
 #include <rfb/tightEncode.h>
 #undef BPP
 
-TightEncoder::TightEncoder(SMsgWriter* writer_) : writer(writer_)
+TightEncoder::TightEncoder(SMsgWriter* writer) : Encoder(writer)
 {
   setCompressLevel(defaultCompressLevel);
   setQualityLevel(-1);
diff --git a/common/rfb/TightEncoder.h b/common/rfb/TightEncoder.h
index a499783..e2fa96e 100644
--- a/common/rfb/TightEncoder.h
+++ b/common/rfb/TightEncoder.h
@@ -142,7 +142,6 @@
     void encodeJpegRect32(rdr::U32 *buf, int stride, const Rect& r,
                           rdr::OutStream *os);
 
-    SMsgWriter* writer;
     rdr::MemOutStream mos;
     rdr::ZlibOutStream zos[4];
     JpegCompressor jc;
diff --git a/common/rfb/ZRLEDecoder.cxx b/common/rfb/ZRLEDecoder.cxx
index 111e2de..20fe853 100644
--- a/common/rfb/ZRLEDecoder.cxx
+++ b/common/rfb/ZRLEDecoder.cxx
@@ -40,7 +40,7 @@
 #undef CPIXEL
 #undef BPP
 
-ZRLEDecoder::ZRLEDecoder(CMsgReader* reader_) : reader(reader_)
+ZRLEDecoder::ZRLEDecoder(CMsgReader* reader) : Decoder(reader)
 {
 }
 
diff --git a/common/rfb/ZRLEDecoder.h b/common/rfb/ZRLEDecoder.h
index 2128ab9..dee2068 100644
--- a/common/rfb/ZRLEDecoder.h
+++ b/common/rfb/ZRLEDecoder.h
@@ -29,7 +29,6 @@
     virtual ~ZRLEDecoder();
     virtual void readRect(const Rect& r, CMsgHandler* handler);
   private:
-    CMsgReader* reader;
     rdr::ZlibInStream zis;
   };
 }
diff --git a/common/rfb/ZRLEEncoder.cxx b/common/rfb/ZRLEEncoder.cxx
index 7e00fad..df7cfbd 100644
--- a/common/rfb/ZRLEEncoder.cxx
+++ b/common/rfb/ZRLEEncoder.cxx
@@ -46,8 +46,8 @@
 #undef CPIXEL
 #undef BPP
 
-ZRLEEncoder::ZRLEEncoder(SMsgWriter* writer_)
-  : writer(writer_), zos(0,0,zlibLevel), mos(129*1024)
+ZRLEEncoder::ZRLEEncoder(SMsgWriter* writer)
+  : Encoder(writer), zos(0,0,zlibLevel), mos(129*1024)
 {
 }
 
diff --git a/common/rfb/ZRLEEncoder.h b/common/rfb/ZRLEEncoder.h
index acc6d36..9679887 100644
--- a/common/rfb/ZRLEEncoder.h
+++ b/common/rfb/ZRLEEncoder.h
@@ -30,7 +30,6 @@
     virtual ~ZRLEEncoder();
     virtual void writeRect(const Rect& r, TransImageGetter* ig);
   private:
-    SMsgWriter* writer;
     rdr::ZlibOutStream zos;
     rdr::MemOutStream mos;
   };