ThorstenB
77f73a79df
Apparently a 4K buf isn't enough. 64K seem much better ;-). Real solution may be an adaptive buffer size in gzfilebuf.
159 lines
3.6 KiB
C++
159 lines
3.6 KiB
C++
/**
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* \file zfstream.hxx
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* A C++ I/O streams interface to the zlib gz* functions.
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*/
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// Written by Bernie Bright, 1998
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// Based on zlib/contrib/iostream/ by Kevin Ruland <kevin@rodin.wustl.edu>
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//
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// Copyright (C) 1998 Bernie Bright - bbright@c031.aone.net.au
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//
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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 Library 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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//
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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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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifndef _zfstream_hxx
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#define _zfstream_hxx
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#include <simgear/compiler.h>
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#include <zlib.h>
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#include <streambuf>
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#include <istream>
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#define ios_openmode std::ios_base::openmode
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#define ios_in std::ios_base::in
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#define ios_out std::ios_base::out
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#define ios_app std::ios_base::app
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#define ios_binary std::ios_base::binary
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#define ios_seekdir std::ios_base::seekdir
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#define ios_badbit std::ios_base::badbit
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#define ios_failbit std::ios_base::failbit
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/**
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* A C++ I/O streams interface to the zlib gz* functions.
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*/
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#ifdef SG_NEED_STREAMBUF_HACK
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class gzfilebuf : public __streambuf {
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typedef __streambuf parent;
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#else
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class gzfilebuf : public std::streambuf {
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typedef std::streambuf parent;
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#endif
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public:
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/** Constructor */
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gzfilebuf();
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/** Destructor */
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virtual ~gzfilebuf();
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/**
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* Open a stream
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* @param name file name
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* @param io_mode mode flags
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* @return file stream
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*/
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gzfilebuf* open( const char* name, ios_openmode io_mode );
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/**
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* Attach to an existing file descriptor
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* @param file_descriptor file descriptor
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* @param io_mode mode flags
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* @return file stream
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*/
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gzfilebuf* attach( int file_descriptor, ios_openmode io_mode );
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/** Close stream */
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gzfilebuf* close();
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int setcompressionlevel( int comp_level );
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int setcompressionstrategy( int comp_strategy );
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/** @return true if open, false otherwise */
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bool is_open() const { return (file != NULL); }
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/** @return stream position */
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virtual std::streampos seekoff( std::streamoff off, ios_seekdir way, ios_openmode which );
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/** sync the stream */
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virtual int sync();
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protected:
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virtual int_type underflow();
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virtual int_type overflow( int_type c = parent::traits_type::eof() );
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bool out_waiting();
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char* base() {return obuffer;}
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int blen() {return obuf_size;}
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char allocate();
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private:
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int_type flushbuf();
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int fillbuf();
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// Convert io_mode to "rwab" string.
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void cvt_iomode( char* mode_str, ios_openmode io_mode );
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private:
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gzFile file;
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ios_openmode mode;
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bool own_file_descriptor;
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// Get (input) buffer.
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int ibuf_size;
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char* ibuffer;
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// Put (output) buffer.
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int obuf_size;
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char* obuffer;
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enum { page_size = 65536 };
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private:
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// Not defined
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gzfilebuf( const gzfilebuf& );
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void operator= ( const gzfilebuf& );
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};
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/**
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* document me
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*/
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struct gzifstream_base
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{
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gzifstream_base() {}
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gzfilebuf gzbuf;
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};
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/**
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* document me too
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*/
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struct gzofstream_base
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{
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gzofstream_base() {}
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gzfilebuf gzbuf;
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};
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#endif // _zfstream_hxx
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