49 lines
1.0 KiB
Python
49 lines
1.0 KiB
Python
import asyncio
|
|
import struct
|
|
|
|
from typing import Tuple
|
|
|
|
|
|
def encode_uvarint(number: int) -> bytearray:
|
|
"""Pack `number` into varint bytes"""
|
|
buf = b""
|
|
while True:
|
|
towrite = number & 0x7F
|
|
number >>= 7
|
|
if number:
|
|
buf += bytes((towrite | 0x80,))
|
|
else:
|
|
buf += bytes((towrite,))
|
|
break
|
|
return buf
|
|
|
|
|
|
def decode_uvarint(buff: bytearray, index: int) -> Tuple[int, int]:
|
|
shift = 0
|
|
result = 0
|
|
while True:
|
|
i = buff[index]
|
|
result |= (i & 0x7F) << shift
|
|
shift += 7
|
|
if not i & 0x80:
|
|
break
|
|
index += 1
|
|
|
|
return result, index + 1
|
|
|
|
|
|
async def decode_uvarint_from_stream(
|
|
reader: asyncio.StreamReader, timeout: float
|
|
) -> int:
|
|
shift = 0
|
|
result = 0
|
|
while True:
|
|
byte = await asyncio.wait_for(reader.read(1), timeout=timeout)
|
|
i = struct.unpack(">H", b"\x00" + byte)[0]
|
|
result |= (i & 0x7F) << shift
|
|
shift += 7
|
|
if not i & 0x80:
|
|
break
|
|
|
|
return result
|