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Sun, May 26, 00:15

gzfstream.hh
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/**
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
*
* @section LICENSE
*
* Copyright (©) 2016 EPFL (Ecole Polytechnique Fédérale de
* Lausanne) Laboratory (LSMS - Laboratoire de Simulation en Mécanique des
* Solides)
*
* Tamaas 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 3 of the License, or (at your option) any
* later version.
*
* Tamaas 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 Tamaas. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef __GZFSTREAM_HH__
#define __GZFSTREAM_HH__
/* -------------------------------------------------------------------------- */
#include <string>
#include <sstream>
#include <zlib.h>
/* -------------------------------------------------------------------------- */
__BEGIN_TAMAAS__
class GZfstream {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
inline GZfstream();
inline virtual ~GZfstream();
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
inline void open(const std::string & filename,std::ios_base::openmode mode);
inline void flush();
inline void precision(int i);
inline void getline(std::string & str);
template <typename T>
inline GZfstream & operator << (const T& value);
template <typename T>
inline GZfstream & operator >> (T& value);
inline GZfstream & operator << (std::ostream& (*op)(std::ostream&));
bool & getFlagBinary(){return flag_binary;};
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
private:
bool flag_binary;
gzFile gzfile;
std::stringstream buffer;
bool opened;
};
/* -------------------------------------------------------------------------- */
inline GZfstream::GZfstream(){
opened = false;
flag_binary = false;
}
/* -------------------------------------------------------------------------- */
inline void GZfstream::flush(){
gzwrite(gzfile,buffer.str().c_str(),buffer.str().length());
// cout << "flushing " << buffer.str() << endl;
buffer.str("");
}
/* -------------------------------------------------------------------------- */
inline GZfstream::~GZfstream(){
if (opened){
flush();
gzclose(gzfile);
}
}
/* -------------------------------------------------------------------------- */
inline void GZfstream::precision(int p){
buffer.precision(p);
}
/* -------------------------------------------------------------------------- */
inline void GZfstream::open(const std::string & filename,std::ios_base::openmode mode){
std::string _mode = "";
if (mode & std::ios::app) _mode += "a+";
if (mode & std::ios::ate) _mode += "a+";
if (mode & std::ios::in) _mode += "r";
if (mode & std::ios::out) _mode += "w+";
if (mode & std::ios::trunc) _mode += "w";
// string fn = filename + ".gz";
std::string fn = filename;
std::cout << "opening " << fn << std::endl;
gzfile = NULL;
gzfile = gzopen(fn.c_str(),_mode.c_str());
if (gzfile) opened = true;
}
/* -------------------------------------------------------------------------- */
template <typename T>
inline GZfstream & GZfstream::operator << (const T& value){
buffer << value;
if (buffer.str().length() > 1024) flush();
return (*this);
}
/* -------------------------------------------------------------------------- */
template <>
inline GZfstream & GZfstream::operator << (const Real& value){
if(flag_binary){
gzwrite(gzfile,&value,sizeof(Real));
}
else{
buffer << value;
if (buffer.str().length() > 1024) flush();
}
return (*this);
}
/* -------------------------------------------------------------------------- */
template <typename T>
inline GZfstream & GZfstream::operator >> (T& value){
std::cout << "not working" << std::endl;
exit (EXIT_FAILURE);
return (*this);
}
/* -------------------------------------------------------------------------- */
template <>
inline GZfstream & GZfstream::operator >> (Real& value){
if(flag_binary){
int ret = gzread(gzfile,&value,sizeof(Real));
if (ret == 0){
std::cout << "end of file" << std::endl;
exit(EXIT_FAILURE);
}
if (ret == -1){
std::cout << "error" << std::endl;
exit(EXIT_FAILURE);
}
}
return (*this);
}
/* -------------------------------------------------------------------------- */
inline GZfstream & GZfstream::operator << (std::ostream & (*op)(std::ostream&)){
(*op)(buffer);
flush();
return (*this);
}
/* -------------------------------------------------------------------------- */
inline void GZfstream::getline(std::string & str){
if (!opened) {
std::cout << "file not opened" << std::endl;
exit(EXIT_FAILURE);
}
int len = 512;
char buf[len];
char * read = gzgets(gzfile,buf,len);
if (read){
str = buf;
}
else {
std::cout << "could not read the content" << std::endl;
exit(EXIT_FAILURE);
}
}
/* -------------------------------------------------------------------------- */
void getline(GZfstream & file,std::string & str){
file.getline(str);
}
/* -------------------------------------------------------------------------- */
__END_TAMAAS__
#endif /* __GZFSTREAM_HH__ */

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