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kgzipfilter.h

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00001 /* This file is part of the KDE libraries
00002    Copyright (C) 2000, 2009 David Faure <faure@kde.org>
00003 
00004    This library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Library General Public
00006    License as published by the Free Software Foundation; either
00007    version 2 of the License, or (at your option) any later version.
00008 
00009    This library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Library General Public License for more details.
00013 
00014    You should have received a copy of the GNU Library General Public License
00015    along with this library; see the file COPYING.LIB.  If not, write to
00016    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017    Boston, MA 02110-1301, USA.
00018 */
00019 
00020 #ifndef __kgzipfilter__h
00021 #define __kgzipfilter__h
00022 
00023 #include "kfilterbase.h"
00024 
00032 class KDECORE_EXPORT KGzipFilter : public KFilterBase
00033 {
00034 public:
00035     KGzipFilter();
00036     virtual ~KGzipFilter();
00037 
00038 
00039     virtual void init(int mode);
00040 
00041     // The top of zlib.h explains it: there are three cases.
00042     // - Raw deflate, no header (e.g. inside a ZIP file)
00043     // - Thin zlib header (1) (which is normally what HTTP calls "deflate" (2))
00044     // - Gzip header, implemented here by readHeader
00045     //
00046     // (1) as written out by compress()/compress2()
00047     // (2) see http://www.zlib.net/zlib_faq.html#faq39
00048     enum Flag {
00049         RawDeflate = 0, // raw deflate data
00050         ZlibHeader = 1, // zlib headers (HTTP deflate)
00051         GZipHeader = 2
00052     };
00053     void init(int mode, Flag flag); // for direct users of KGzipFilter
00054     virtual int mode() const;
00055     virtual void terminate();
00056     virtual void reset();
00057     virtual bool readHeader(); // this is about the GZIP header
00058     virtual bool writeHeader( const QByteArray & fileName );
00059     void writeFooter();
00060     virtual void setOutBuffer( char * data, uint maxlen );
00061     virtual void setInBuffer( const char * data, uint size );
00062     virtual int  inBufferAvailable() const;
00063     virtual int  outBufferAvailable() const;
00064     virtual Result uncompress();
00065     virtual Result compress( bool finish );
00066 
00067 private:
00068     Result uncompress_noop();
00069     class Private;
00070     Private* const d;
00071 };
00072 
00073 #endif

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