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/*************************************************************************
* Copyright (C) 2017-2018 Barcelona Supercomputing Center *
* Centro Nacional de Supercomputacion *
* All rights reserved. *
* *
* This file is part of the NORNS Data Scheduler, a service that allows *
* other programs to start, track and manage asynchronous transfers of *
* data resources transfers requests between different storage backends. *
* *
* See AUTHORS file in the top level directory for information *
* regarding developers and contributors. *
* *
* The NORNS Data Scheduler 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. *
* *
* The NORNS Data Scheduler 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 the NORNS Data Scheduler. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include <string>
#include <algorithm>
#include <locale>
#include "utils.hpp"
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namespace utils {
uint64_t parse_size(const std::string& str){
const uint64_t B_FACTOR = 1;
const uint64_t KB_FACTOR = 1e3;
const uint64_t KiB_FACTOR = (1 << 10);
const uint64_t MB_FACTOR = 1e6;
const uint64_t MiB_FACTOR = (1 << 20);
const uint64_t GB_FACTOR = 1e9;
const uint64_t GiB_FACTOR = (1 << 30);
std::pair<std::string, uint64_t> conversions[] = {
{"GiB", GiB_FACTOR},
{"GB", GB_FACTOR},
{"G", GB_FACTOR},
{"MiB", MiB_FACTOR},
{"MB", MB_FACTOR},
{"M", MB_FACTOR},
{"KiB", KiB_FACTOR},
{"KB", KB_FACTOR},
{"K", KB_FACTOR},
{"B", B_FACTOR},
};
std::string scopy(str);
/* remove whitespaces from the string */
scopy.erase(std::remove_if(scopy.begin(), scopy.end(),
[](char ch){
return std::isspace<char>(ch, std::locale::classic());
}),
scopy.end() );
/* determine the units */
std::size_t pos = std::string::npos;
uint64_t factor = B_FACTOR;
for(const auto& c: conversions){
const std::string& suffix = c.first;
if((pos = scopy.find(suffix)) != std::string::npos){
/* check that the candidate is using the suffix EXACTLY
* to prevent accepting something like "GBfoo" as a valid Gigabyte unit */
if(suffix != scopy.substr(pos)){
pos = std::string::npos;
continue;
}
factor = c.second;
break;
}
}
/* this works as expected because if pos == std::string::npos, the standard
* states that all characters until the end of the string should be included.*/
std::string number_str = scopy.substr(0, pos);
/* check if it's a valid number */
if(number_str == "" || !std::all_of(number_str.begin(), number_str.end(), ::isdigit)){
throw std::invalid_argument("Not a number");
}
double value = std::stod(number_str);
return std::round(value*factor);
}
} // namespace utils