mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-12-05 02:40:16 +00:00
bc8df6de31
* [pre-commit.ci] pre-commit autoupdate updates: - [github.com/astral-sh/ruff-pre-commit: v0.2.2 → v0.3.2](https://github.com/astral-sh/ruff-pre-commit/compare/v0.2.2...v0.3.2) - [github.com/pre-commit/mirrors-mypy: v1.8.0 → v1.9.0](https://github.com/pre-commit/mirrors-mypy/compare/v1.8.0...v1.9.0) * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
"""
|
|
Base32 encoding and decoding
|
|
|
|
https://en.wikipedia.org/wiki/Base32
|
|
"""
|
|
|
|
B32_CHARSET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"
|
|
|
|
|
|
def base32_encode(data: bytes) -> bytes:
|
|
"""
|
|
>>> base32_encode(b"Hello World!")
|
|
b'JBSWY3DPEBLW64TMMQQQ===='
|
|
>>> base32_encode(b"123456")
|
|
b'GEZDGNBVGY======'
|
|
>>> base32_encode(b"some long complex string")
|
|
b'ONXW2ZJANRXW4ZZAMNXW24DMMV4CA43UOJUW4ZY='
|
|
"""
|
|
binary_data = "".join(bin(ord(d))[2:].zfill(8) for d in data.decode("utf-8"))
|
|
binary_data = binary_data.ljust(5 * ((len(binary_data) // 5) + 1), "0")
|
|
b32_chunks = map("".join, zip(*[iter(binary_data)] * 5))
|
|
b32_result = "".join(B32_CHARSET[int(chunk, 2)] for chunk in b32_chunks)
|
|
return bytes(b32_result.ljust(8 * ((len(b32_result) // 8) + 1), "="), "utf-8")
|
|
|
|
|
|
def base32_decode(data: bytes) -> bytes:
|
|
"""
|
|
>>> base32_decode(b'JBSWY3DPEBLW64TMMQQQ====')
|
|
b'Hello World!'
|
|
>>> base32_decode(b'GEZDGNBVGY======')
|
|
b'123456'
|
|
>>> base32_decode(b'ONXW2ZJANRXW4ZZAMNXW24DMMV4CA43UOJUW4ZY=')
|
|
b'some long complex string'
|
|
"""
|
|
binary_chunks = "".join(
|
|
bin(B32_CHARSET.index(_d))[2:].zfill(5)
|
|
for _d in data.decode("utf-8").strip("=")
|
|
)
|
|
binary_data = list(map("".join, zip(*[iter(binary_chunks)] * 8)))
|
|
return bytes("".join([chr(int(_d, 2)) for _d in binary_data]), "utf-8")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import doctest
|
|
|
|
doctest.testmod()
|