mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-10 09:48:32 +00:00
Dion Moult
59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2021 Thomas Krijnen <thomas@aecgeeks.com>
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#
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# This file is part of IfcOpenShell.
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#
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# IfcOpenShell is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser 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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# IfcOpenShell 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 Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with IfcOpenShell. If not, see <http://www.gnu.org/licenses/>.
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"""Reads and writes encoded GlobalIds"""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import uuid
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import string
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from functools import reduce
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chars = string.digits + string.ascii_uppercase + string.ascii_lowercase + "_$"
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def compress(g):
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bs = [int(g[i : i + 2], 16) for i in range(0, len(g), 2)]
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def b64(v, l=4):
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return "".join([chars[(v // (64 ** i)) % 64] for i in range(l)][::-1])
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return "".join([b64(bs[0], 2)] + [b64((bs[i] << 16) + (bs[i + 1] << 8) + bs[i + 2]) for i in range(1, 16, 3)])
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def expand(g):
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def b64(v):
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return reduce(lambda a, b: a * 64 + b, map(lambda c: chars.index(c), v))
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bs = [b64(g[0:2])]
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for i in range(5):
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d = b64(g[2 + 4 * i : 6 + 4 * i])
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bs += [(d >> (8 * (2 - j))) % 256 for j in range(3)]
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return "".join(["%02x" % b for b in bs])
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def split(g):
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return "{%s-%s-%s-%s-%s}" % (g[:8], g[8:12], g[12:16], g[16:20], g[20:])
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def new():
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return compress(uuid.uuid4().hex)
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