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helper.h
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helper.h
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/*
* Copyright (c) 2016 Michal Srb <michalsrb@gmail.com>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef HELPER_H
#define HELPER_H
#include <unistd.h>
#include <system_error>
#include <gnutls/gnutls.h>
/**
* Helper function to throw std::system_error with current errno.
*/
inline void throw_errno()
{
throw std::system_error(errno, std::system_category());
}
/**
* Helper function to throw std::system_error with current errno and extra message
*/
inline void throw_errno(const char *what_arg)
{
throw std::system_error(errno, std::system_category(), what_arg);
}
/**
* Helper function to throw std::system_error with current errno and extra message
*/
inline void throw_errno(const std::string &what_arg)
{
throw std::system_error(errno, std::system_category(), what_arg);
}
/**
* EOF for Stream.
*/
class eof_exception : public std::exception {
public:
virtual const char* what() const noexcept {
return "EOF";
}
};
/**
* Helper class that can be used to assure closing of file descriptor on scope exit.
*/
class FD
{
public:
FD() {}
FD(int fd ) : m_fd(fd ) {}
FD(const FD & ) = delete;
~FD() {
if(m_fd != -1 ) {
::close(m_fd);
}
}
FD &operator=(const FD & ) = delete;
FD &operator=(int fd ) {
if(m_fd != -1 ) {
::close(m_fd);
}
m_fd = fd;
return *this;
}
operator int() const {
return m_fd;
}
void close() {
::close(m_fd);
m_fd = -1;
}
private:
int m_fd = -1;
};
/**
* Helper to do gnutls init/deinit RAII style.
*/
class GnuTlsInstance {
public:
GnuTlsInstance() {
gnutls_global_init();
}
~GnuTlsInstance() {
gnutls_global_deinit();
}
};
#endif // HELPER_H