Remove unnecessary GZCodec derivation

Change-Id: Id710a1fe4a3c1593add69bb2a7014d26f9499e87

filter/source/svg/svgfilter.cxx

@@ -370,8 +370,8 @@ OUString SAL_CALL SVGFilter::detect(Sequence<PropertyValue>& rDescriptor) throw
             return OUString();
         xSeek->seek(0);
 
-        GZCodec aCodec;
-        aCodec.BeginCompression();
+        ZCodec aCodec;
+        aCodec.BeginCompression(ZCODEC_DEFAULT_COMPRESSION, false, true);
         aCodec.Decompress(*aStream.get(), *pMemoryStream);
         aCodec.EndCompression();
         pMemoryStream->Seek(STREAM_SEEK_TO_BEGIN);

filter/source/svg/svgimport.cxx

@@ -67,8 +67,8 @@ bool SVGFilter::implImport( const Sequence< PropertyValue >& rDescriptor )
             return false;
 
         SvStream* pMemoryStream = new SvMemoryStream;
-        GZCodec aCodec;
-        aCodec.BeginCompression();
+        ZCodec aCodec;
+        aCodec.BeginCompression(ZCODEC_DEFAULT_COMPRESSION, false, true);
         aCodec.Decompress(*aStream.get(), *pMemoryStream);
         aCodec.EndCompression();
         pMemoryStream->Seek(STREAM_SEEK_TO_BEGIN);

include/tools/zcodec.hxx

@@ -52,10 +52,10 @@ private:
 
 public:
                     ZCodec( sal_uIntPtr nInBuf = 0x8000UL, sal_uIntPtr nOutBuf = 0x8000UL );
-    virtual         ~ZCodec();
+                    ~ZCodec();
 
-    virtual void    BeginCompression( int nCompressLevel = ZCODEC_DEFAULT_COMPRESSION, bool updateCrc = false, bool gzLib = false );
-    virtual long    EndCompression();
+    void            BeginCompression( int nCompressLevel = ZCODEC_DEFAULT_COMPRESSION, bool updateCrc = false, bool gzLib = false );
+    long            EndCompression();
     bool            IsFinished () const { return mbFinish; }
 
     long            Compress( SvStream& rIStm, SvStream& rOStm );
@@ -72,17 +72,6 @@ public:
     sal_uIntPtr     GetCRC();
 };
 
-class GZCodec : public ZCodec
-{
-public:
-                    GZCodec(){};
-                    virtual ~GZCodec(){};
-    virtual void    BeginCompression( int nCompressLevel = ZCODEC_DEFAULT_COMPRESSION, bool updateCrc = false, bool gzLib = true ) SAL_OVERRIDE
-    {
-        ZCodec::BeginCompression( nCompressLevel, updateCrc, gzLib );
-    };
-};
-
 #endif
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

vcl/source/filter/graphicfilter.cxx

@@ -655,9 +655,9 @@ static bool ImpPeekGraphicFormat( SvStream& rStream, OUString& rFormatExtension,
         // check if it is gzipped -> svgz
         if(sFirstBytes[0] == 0x1F && sFirstBytes[1] == 0x8B)
         {
-            GZCodec aCodec;
+            ZCodec aCodec;
             rStream.Seek(nStreamPos);
-            aCodec.BeginCompression();
+            aCodec.BeginCompression(ZCODEC_DEFAULT_COMPRESSION, false, true);
             nDecompressedSize = aCodec.Read(rStream, sExtendedOrDecompressedFirstBytes, 2048);
             nCheckSize = nDecompressedSize < 256 ? nDecompressedSize : 256;
             aCodec.EndCompression();
@@ -1517,10 +1517,10 @@ sal_uInt16 GraphicFilter::ImportGraphic( Graphic& rGraphic, const OUString& rPat
                 if(aTwoBytes[0] == 0x1F && aTwoBytes[1] == 0x8B)
                 {
                     SvMemoryStream aMemStream;
-                    GZCodec aCodec;
+                    ZCodec aCodec;
                     long nMemoryLength;
 
-                    aCodec.BeginCompression();
+                    aCodec.BeginCompression(ZCODEC_DEFAULT_COMPRESSION, false, true);
                     nMemoryLength = aCodec.Decompress(rIStream, aMemStream);
                     aCodec.EndCompression();