56 lines
1.4 KiB
Python
56 lines
1.4 KiB
Python
# Pyrogram - Telegram MTProto API Client Library for Python
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# Copyright (C) 2017-2018 Dan Tès <https://github.com/delivrance>
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#
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# This file is part of Pyrogram.
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#
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# Pyrogram 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
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# by 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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# Pyrogram 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 Pyrogram. If not, see <http://www.gnu.org/licenses/>.
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from base64 import b64decode, b64encode
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def decode(s: str) -> bytes:
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s = b64decode(s + "=" * (-len(s) % 4), "-_")
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r = b""
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assert s[-1] == 2
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i = 0
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while i < len(s) - 1:
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if s[i] != 0:
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r += bytes([s[i]])
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else:
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r += b"\x00" * s[i + 1]
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i += 1
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i += 1
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return r
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def encode(s: bytes) -> str:
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r = b""
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n = 0
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for i in s + bytes([2]):
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if i == 0:
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n += 1
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else:
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if n:
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r += b"\x00" + bytes([n])
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n = 0
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r += bytes([i])
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return b64encode(r, b"-_").decode().rstrip("=")
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