51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
# Copyright (c) 2015 SUSE Linux GmbH. All rights reserved.
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#
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# This file is part of kiwi.
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#
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# kiwi is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# kiwi is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with kiwi. If not, see <http://www.gnu.org/licenses/>
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#
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import re
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import math
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from kiwi.exceptions import KiwiSizeError
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class StringToSize:
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"""
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**Performs size convertions from strings to numbers**
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"""
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@staticmethod
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def to_bytes(size_value):
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"""
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Convert the given string representig a size into the appropriate
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number of bytes.
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:param str size_value: a size in bytes or specified with m=MB or g=GB
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:return: the number of bytes represented by size_value string
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:rtype: int
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"""
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size_format = r'^(\d+)([gGmM]{0,1})$'
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size = re.search(size_format, size_value)
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if not size:
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raise KiwiSizeError(
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'unsupported size format {0}, must match {1}'.format(
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size_value, size_format
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)
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)
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size_base = int(size.group(1))
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size_unit = {'g': 3, 'm': 2}.get(size.group(2).lower())
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return size_base * math.pow(1024, size_unit) if size_unit \
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else size_base
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