fdiostream.h

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// -*- mode: c++; c-basic-offset:4 -*-
 
// This file is part of libdap, A C++ implementation of the OPeNDAP Data
// Access Protocol.
 
// Copyright (c) 2009 OPeNDAP, Inc.
// Author: James Gallagher <jgallagher@opendap.org>
//
// 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
//
// Portions of this code were taken verbatim from  Josuttis,
// "The C++ Standard Library," p.672
 
#ifndef _fdiostream_h
#define _fdiostream_h
 
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
 
#include <algorithm>
#include <cstdio>
#include <iostream>
#include <streambuf>
 
namespace libdap {

class fdoutbuf : public std::streambuf {
protected:
    int fd; // file descriptor
    bool close;
    static const int bufferSize = 4096; // Size of the data buffer
    char buffer[bufferSize];            // data buffer
 
public:
    fdoutbuf(int _fd, bool _close);
    virtual ~fdoutbuf();
 
protected:
    int flushBuffer();
 
    virtual int overflow(int c);
    virtual int sync();
    virtual std::streamsize xsputn(const char *s, std::streamsize num);
};

class fdostream : public std::ostream {
protected:
    fdoutbuf buf;
 
public:
    fdostream(int _fd, bool _close = false) : std::ostream(&buf), buf(_fd, _close) {}
};

class fdinbuf : public std::streambuf {
protected:
    int fd; // file descriptor
    bool close;
    static const int bufferSize = 4096; // Size of the data buffer
    static const int putBack = 128;
    char buffer[bufferSize]; // data buffer
 
public:
    fdinbuf(int _fd, bool close);
    virtual ~fdinbuf();
 
protected:
    virtual int underflow();
};

class fdistream : public std::istream {
protected:
    fdinbuf buf;
 
public:
    fdistream(int fd, bool close = false) : std::istream(&buf), buf(fd, close) {}
};

class fpinbuf : public std::streambuf {
protected:
    FILE *fp; // FILE *
    bool close;
    static const int bufferSize = 4096; // Size of the data buffer
    static const int putBack = 128;
    char buffer[bufferSize]; // data buffer
 
public:
    fpinbuf(FILE *_fp, bool _close);
    virtual ~fpinbuf();
 
protected:
    virtual int underflow();
};

class fpistream : public std::istream {
protected:
    fpinbuf buf;
 
public:
    fpistream(FILE *fp, bool close = false) : std::istream(&buf), buf(fp, close) {}
};
 
} // namespace libdap
 
#endif