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/* -*- Mode: c++ -*- */
/***************************************************************************
* bytesize_parser.cc
*
* Sat Mar 4 18:00:12 CET 2017
* Copyright 2017 Goran Mekić
* meka@tilda.center
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo 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.
*
* DrumGizmo 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 DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "bytesizeparser.h"
#include <iostream>
#include <stdexcept>
namespace {
std::size_t suffixToSize(const char& suffix)
{
constexpr std::size_t kilo{10};
constexpr std::size_t mega{20};
constexpr std::size_t giga{30};
std::size_t size{1};
switch(suffix)
{
case 'k':
size <<= kilo;
break;
case 'M':
size <<= mega;
break;
case 'G':
size <<= giga;
break;
default:
size = 0;
break;
}
return size;
}
}
std::size_t byteSizeParser(const std::string& argument)
{
std::string::size_type suffix_index{};
std::size_t size{};
std::string suffix;
bool error{false};
if(argument.find('-') != std::string::npos)
{
error = true;
}
try
{
size = std::stoi(argument, &suffix_index);
}
catch(std::invalid_argument&)
{
std::cerr << "Invalid argument for diskstreamsize\n";
error = true;
}
catch(std::out_of_range&)
{
std::cerr << "Number too big. Try using bigger suffix for diskstreamsize\n";
error = true;
}
if(!error)
{
suffix = argument.substr(suffix_index);
if (suffix.length() > 1)
{
error = true;
}
}
if(!error && !suffix.empty())
{
const std::size_t suffix_size = suffixToSize(suffix[0]);
size *= suffix_size;
}
if(error)
{
return 0;
}
return size;
}
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