pstruebi/bumble_fork
1
0
Fork 0
forked from auracaster/bumble_mirror
Code Pull Requests Activity

L2CAP: FCS Implementation

Browse Source
This commit is contained in:
Josh Wu
2025-09-26 21:59:56 +08:00
parent 57e05781ad
commit 456cb59b48
6 changed files with 335 additions and 170 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
bumble/utils.py
View File

@@ -533,3 +533,20 @@ class IntConvertible(Protocol):
def __init__(self, value: int) -> None: ...
def __int__(self) -> int: ...
# -----------------------------------------------------------------------------
def crc_16(data: bytes) -> int:
"""Calculate CRC-16-IBM of given data.
Polynomial = x^16 + x^15 + x^2 + 1 = 0x8005 or 0xA001(Reversed)
"""
crc = 0x0000
for byte in data:
crc ^= byte
for _ in range(8):
if (crc & 0x0001) > 0:
crc = (crc >> 1) ^ 0xA001
else:
crc = crc >> 1
return crc