120ca87015
git-svn-id: https://free-cad.svn.sourceforge.net/svnroot/free-cad/trunk@5000 e8eeb9e2-ec13-0410-a4a9-efa5cf37419d
110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
#ifndef DEFLATEOUTPUTSTREAMBUF_H
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#define DEFLATEOUTPUTSTREAMBUF_H
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#include "zipios-config.h"
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#include "meta-iostreams.h"
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#include <vector>
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#include <zlib.h>
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#include "filteroutputstreambuf.h"
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#include "ziphead.h"
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#include "zipios_defs.h"
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namespace zipios {
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using std::vector ;
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/** DeflateOutputStreambuf is an output stream filter, that deflates
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the data that is written to it before it passes it on to the
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output stream it is attached to. Deflation/Inflation is a
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compression/decompression method used in gzip and zip. The zlib
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library is used to perform the actual deflation, this class only
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wraps the functionality in an output stream filter. */
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class BaseExport DeflateOutputStreambuf : public FilterOutputStreambuf {
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public:
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/** DeflateOutputStreambuf constructor.
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@param outbuf the streambuf to use for output.
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@param user_init If false user must invoke init() before writing any data.
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(ZipOutputStreambuf needs to do this)
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@param del_outbuf if true is specified outbuf will be deleted, when
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the DeflateOutputStreambuf is destructed. */
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explicit DeflateOutputStreambuf( streambuf *outbuf, bool user_init = false,
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bool del_outbuf = false ) ;
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/** Destructor. */
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virtual ~DeflateOutputStreambuf() ;
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bool init( int comp_level = 6 ) ;
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bool closeStream() ;
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/** Returns the CRC32 for the current stream. The returned value is
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the CRC for the data that has been compressed already (due to a
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call to overflow()). As DeflateOutputStreambuf may buffer an
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arbitrary amount of bytes until closeStream() has been invoked,
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the returned value is not very useful before closeStream() has
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been called. */
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uint32 getCrc32() const { return _crc32 ; }
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/** Returns the number of bytes written to the streambuf, that has
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been processed from the input buffer by the compressor. After
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closeStream() has been called this number is the total number of
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bytes written to the stream. */
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uint32 getCount() const { return _overflown_bytes ; }
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protected:
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virtual int overflow( int c = EOF ) ;
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virtual int sync() ;
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/** Flushes _outvec and updates _zs.next_out and _zs.avail_out. */
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bool flushOutvec() ;
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/** Flushes the remaining data in the zlib buffers, after which the
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only possible operations are deflateEnd() or deflateReset(). */
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void endDeflation() ;
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private:
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z_stream _zs ;
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bool _zs_initialized ;
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protected: // FIXME: reconsider design?
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const int _invecsize ;
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vector< char > _invec ;
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const int _outvecsize ;
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vector< char > _outvec ;
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uint32 _crc32 ;
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uint32 _overflown_bytes ;
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};
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} // namespace
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#endif
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/** \file
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Header file that defines DeflateOutputStreambuf.
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*/
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/*
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Zipios++ - a small C++ library that provides easy access to .zip files.
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Copyright (C) 2000 Thomas S<>ndergaard
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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