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"""
bilibili_api.utils.varint
变长数字字节相关。
"""
from typing import Tuple
def read_varint(stream: bytes) -> Tuple[int, int]:
"""
读取 varint。
Args:
stream (bytes): 字节流。
Returns:
Tuple[int, int]，真实值和占用长度。
"""
value = 0
position = 0
shift = 0
while True:
if position >= len(stream):
break
byte = stream[position]
value += (byte & 0b01111111) << shift
if byte & 0b10000000 == 0:
break
position += 1
shift += 7
return value, position + 1
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