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Enso-Bot/venv/Lib/site-packages/~ebsockets/utils.py

19 lines
376 B
Python

import itertools
__all__ = ["apply_mask"]
def apply_mask(data: bytes, mask: bytes) -> bytes:
"""
Apply masking to the data of a WebSocket message.
:param data: Data to mask
:param mask: 4-bytes mask
"""
if len(mask) != 4:
raise ValueError("mask must contain 4 bytes")
return bytes(b ^ m for b, m in zip(data, itertools.cycle(mask)))