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# Copyright (c) 2015 SUSE Linux GmbH. All rights reserved.
#
# This file is part of kiwi.
#
# kiwi is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# kiwi 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with kiwi. If not, see <http://www.gnu.org/licenses/>
#
import re
import math
from kiwi.exceptions import KiwiSizeError
class StringToSize:
"""
**Performs size convertions from strings to numbers**
"""
@staticmethod
def to_bytes(size_value):
"""
Convert the given string representig a size into the appropriate
number of bytes.
:param str size_value: a size in bytes or specified with m=MB or g=GB
:return: the number of bytes represented by size_value string
:rtype: int
"""
size_format = r'^(\d+)([gGmM]{0,1})$'
size = re.search(size_format, size_value)
if not size:
raise KiwiSizeError(
'unsupported size format {0}, must match {1}'.format(
size_value, size_format
)
)
size_base = int(size.group(1))
size_unit = {'g': 3, 'm': 2}.get(size.group(2).lower())
return size_base * math.pow(1024, size_unit) if size_unit \
else size_base
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