Fastest way to convert a C buffer into a python bytes object

Question

I have some C code passes data to a callback. The callback is defined as:

typedef void (*packetHandlerCb)(uint8_t *data, uint32_t len);

I want to set up a python handler for this callback, so I've done something like:

def handle_packet(packet_data, packet_len):
    return bytes(ctypes.cast(packet_data, ctypes.POINTER(ctypes.c_ubyte * packet_len))[0])

PACKET_CB = ctypes.CFUNCTYPE(None, ctypes.POINTER(ctypes.c_ubyte), ctypes.c_uint)
cb = PACKET_CB(handle_packet)

I'm curious if there is a more efficient way to convert the C buffer into a python bytes object

Answer 1

It seems like I can simply do bytes(packet_data[:packet_len]) which seems to be about 30% faster on my computer