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-rw-r--r--src/bytesizeparser.cc99
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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>
+
+
+static std::size_t suffixToSize(const char& suffix)
+{
+ int size = 1;
+ switch(suffix)
+ {
+ case 'k':
+ size <<= 10;
+ break;
+ case 'M':
+ size <<= 20;
+ break;
+ case 'G':
+ size <<= 30;
+ break;
+ default:
+ size = 0;
+ break;
+ }
+ return size;
+}
+
+
+std::size_t byteSizeParser(const std::string& argument)
+{
+ std::string::size_type suffix_index;
+ std::size_t stream_size;
+ std::string suffix;
+ bool error = false;
+
+ try
+ {
+ stream_size = std::stoi(argument, &suffix_index);
+ }
+ catch(std::invalid_argument)
+ {
+ std::cerr << "Invalid option for diskstreamsize" << std::endl;
+ error = true;
+ }
+ catch(std::out_of_range)
+ {
+ std::cerr << "Number too big. Try using bigger suffix for diskstreamsize" << std::endl;
+ error = true;
+ }
+ if(!error)
+ {
+ suffix = argument.substr(suffix_index);
+ if (suffix.length() > 1)
+ {
+ error = true;
+ }
+ }
+ if(!error)
+ {
+ std::size_t suffix_size = suffixToSize(suffix[0]);
+ if (suffix_size)
+ {
+ stream_size *= suffix_size;
+ }
+ }
+ if(error)
+ {
+ std::cerr << "Stream size should be in <number>[suffix] format ";
+ std::cerr << "where [suffix] is k, M, or G." << std::endl;
+ std::cerr << "Example: 10M which is 10 * 1024 * 1024 bytes" << std::endl;
+ return 0;
+ }
+ return stream_size;
+}