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-// ============================================================================
-// gzstream, C++ iostream classes wrapping the zlib compression library.
-// Copyright (C) 2001 Deepak Bandyopadhyay, Lutz Kettner
-//
-// This library is free software; you can redistribute it and/or
-// modify it under the terms of the GNU Lesser General Public
-// License as published by the Free Software Foundation; either
-// version 2.1 of the License, or (at your option) any later version.
-//
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-// Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public
-// License along with this library; if not, write to the Free Software
-// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-// ============================================================================
-//
-// File : gzstream.h
-// Revision : $Revision: 1.5 $
-// Revision_date : $Date: 2002/04/26 23:30:15 $
-// Author(s) : Deepak Bandyopadhyay, Lutz Kettner
-//
-// Standard streambuf implementation following Nicolai Josuttis, "The
-// Standard C++ Library".
-// ============================================================================
-
-#ifndef GZSTREAM_H
-#define GZSTREAM_H 1
-
-// standard C++ with new header file names and std:: namespace
-#include <iostream>
-#include <fstream>
-#include <zlib.h>
-
-#ifdef GZSTREAM_NAMESPACE
-namespace GZSTREAM_NAMESPACE {
-#endif
-
-// ----------------------------------------------------------------------------
-// Internal classes to implement gzstream. See below for user classes.
-// ----------------------------------------------------------------------------
-
-class gzstreambuf : public std::streambuf {
-private:
- static const int bufferSize = 47+(1024*256); // size of data buff
- // totals 512 bytes under g++ for igzstream at the end.
-
- gzFile file; // file handle for compressed file
- char buffer[bufferSize]; // data buffer
- char opened; // open/close state of stream
- int mode; // I/O mode
-
- int flush_buffer();
- void handle_gzerror(); // throws exception
-public:
-#if defined(_WIN32) && !defined(CYGWIN) && !defined(EOF)
- enum {
- EOF = -1
- };
-#endif
- gzstreambuf() : opened(0) {
- setp( buffer, buffer + (bufferSize-1));
- setg( buffer + 4, // beginning of putback area
- buffer + 4, // read position
- buffer + 4); // end position
- // ASSERT: both input & output capabilities will not be used together
- }
- int is_open() { return opened; }
- gzstreambuf* open( const char* name, int open_mode);
- gzstreambuf* close();
- ~gzstreambuf() { close(); }
-
- virtual int overflow( int c = EOF);
- virtual int underflow();
- virtual int sync();
-};
-
-class gzstreambase : virtual public std::ios {
-protected:
- gzstreambuf buf;
-public:
- gzstreambase() { init(&buf); }
- gzstreambase( const char* name, int open_mode);
- ~gzstreambase();
- void open( const char* name, int open_mode);
- void close();
- gzstreambuf* rdbuf() { return &buf; }
-};
-
-// ----------------------------------------------------------------------------
-// User classes. Use igzstream and ogzstream analogously to ifstream and
-// ofstream respectively. They read and write files based on the gz*
-// function interface of the zlib. Files are compatible with gzip compression.
-// ----------------------------------------------------------------------------
-
-class igzstream : public gzstreambase, public std::istream {
-public:
- igzstream() : std::istream( &buf) {}
- igzstream( const char* name, int open_mode = std::ios::in)
- : gzstreambase( name, std::ios::in | open_mode), std::istream( &buf) {}
- gzstreambuf* rdbuf() { return gzstreambase::rdbuf(); }
- void open( const char* name, int open_mode = std::ios::in) {
- gzstreambase::open( name, open_mode);
- }
-};
-
-class ogzstream : public gzstreambase, public std::ostream {
-public:
- ogzstream() : std::ostream( &buf) {}
- ogzstream( const char* name, int mode = std::ios::out)
- : gzstreambase( name, mode), std::ostream( &buf) {}
- gzstreambuf* rdbuf() { return gzstreambase::rdbuf(); }
- void open( const char* name, int open_mode = std::ios::out) {
- gzstreambase::open( name, open_mode);
- }
-};
-
-#ifdef GZSTREAM_NAMESPACE
-} // namespace GZSTREAM_NAMESPACE
-#endif
-
-#endif // GZSTREAM_H
-// ============================================================================
-// EOF //
-