55 lines
1.5 KiB
Cython
55 lines
1.5 KiB
Cython
from cpython cimport PyBytes_AsString
|
|
|
|
#from cpython cimport PyByteArray_AsString # cython still not exports that
|
|
cdef extern from "Python.h":
|
|
char* PyByteArray_AsString(bytearray ba) except NULL
|
|
|
|
from libc.stdint cimport uint32_t, uint64_t, uintmax_t
|
|
|
|
def _websocket_mask_cython(object mask, object data):
|
|
"""Note, this function mutates its `data` argument
|
|
"""
|
|
cdef:
|
|
Py_ssize_t data_len, i
|
|
# bit operations on signed integers are implementation-specific
|
|
unsigned char * in_buf
|
|
const unsigned char * mask_buf
|
|
uint32_t uint32_msk
|
|
uint64_t uint64_msk
|
|
|
|
assert len(mask) == 4
|
|
|
|
if not isinstance(mask, bytes):
|
|
mask = bytes(mask)
|
|
|
|
if isinstance(data, bytearray):
|
|
data = <bytearray>data
|
|
else:
|
|
data = bytearray(data)
|
|
|
|
data_len = len(data)
|
|
in_buf = <unsigned char*>PyByteArray_AsString(data)
|
|
mask_buf = <const unsigned char*>PyBytes_AsString(mask)
|
|
uint32_msk = (<uint32_t*>mask_buf)[0]
|
|
|
|
# TODO: align in_data ptr to achieve even faster speeds
|
|
# does it need in python ?! malloc() always aligns to sizeof(long) bytes
|
|
|
|
if sizeof(size_t) >= 8:
|
|
uint64_msk = uint32_msk
|
|
uint64_msk = (uint64_msk << 32) | uint32_msk
|
|
|
|
while data_len >= 8:
|
|
(<uint64_t*>in_buf)[0] ^= uint64_msk
|
|
in_buf += 8
|
|
data_len -= 8
|
|
|
|
|
|
while data_len >= 4:
|
|
(<uint32_t*>in_buf)[0] ^= uint32_msk
|
|
in_buf += 4
|
|
data_len -= 4
|
|
|
|
for i in range(0, data_len):
|
|
in_buf[i] ^= mask_buf[i]
|