1 files changed, 99 insertions, 0 deletions
diff --git a/src/bytesizeparser.cc b/src/bytesizeparser.cc
new file mode 100644
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--- /dev/null
+++ b/src/bytesizeparser.cc
@@ -0,0 +1,99 @@
+/* -*- 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;
+}