'''MAVLink X25 CRC code'''
from builtins import object

# MAVLINK_MESSAGE_CRCS = [50, 124, 137, 0, 237, 217, 104, 119, 0, 0, 0, 89, 0, 0, 0, 0, 0, 0, 0, 0, 214, 159, 220, 168, 24, 23, 170, 144, 67, 115, 39, 246, 185, 104, 237, 244, 222, 212, 9, 254, 230, 28, 28, 132, 221, 232, 11, 153, 41, 39, 78, 196, 0, 0, 15, 3, 0, 0, 0, 0, 0, 167, 183, 119, 191, 118, 148, 21, 0, 243, 124, 0, 0, 38, 20, 158, 152, 143, 0, 0, 0, 106, 49, 22, 143, 140, 5, 150, 0, 231, 183, 63, 54, 47, 0, 0, 0, 0, 0, 0, 175, 102, 158, 208, 56, 93, 138, 108, 32, 185, 84, 34, 174, 124, 237, 4, 76, 128, 56, 116, 134, 237, 203, 250, 87, 203, 220, 25, 226, 46, 29, 223, 85, 6, 229, 203, 1, 195, 109, 168, 181, 47, 72, 131, 127, 0, 103, 154, 178, 200, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 163, 154, 51, 94, 2, 97, 3, 0, 0, 0, 129, 0, 127, 114, 80, 72, 85, 47, 24, 4, 201, 30, 110, 51, 85, 255, 107, 227, 42, 137, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 163, 105, 151, 35, 150, 0, 0, 0, 0, 0, 0, 90, 104, 85, 95, 130, 184, 81, 8, 204, 49, 170, 44, 83, 46, 0]
MAVLINK_MESSAGE_CRCS = [50, 124, 137, 0, 237, 217, 104, 119, 0, 0, 0, 89, 0, 0, 0, 0, 0, 0, 0, 0, 214, 159, 220, 168, 24, 23, 170, 144, 67, 115, 39, 246, 185, 104, 237, 244, 222, 212, 9, 254, 230, 28, 28, 132, 221, 232, 11, 153, 41, 39, 78, 196, 0, 0, 15, 3, 0, 0, 0, 0, 0, 167, 183, 119, 191, 118, 148, 21, 0, 243, 124, 0, 0, 38, 20, 158, 152, 143, 0, 0, 0, 106, 49, 22, 143, 140, 5, 150, 0, 231, 183, 63, 54, 47, 0, 0, 0, 0, 0, 0, 175, 102, 158, 208, 56, 93, 138, 108, 32, 185, 84, 34, 174, 124, 237, 4, 76, 128, 56, 116, 134, 237, 203, 250, 87, 203, 220, 25, 226, 46, 29, 223, 85, 6, 229, 203, 1, 195, 109, 168, 181, 47, 72, 131, 127, 0, 103, 154, 178, 200, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 163, 154, 51, 94, 10, 141, 3, 0, 0, 0, 129, 0, 127, 114, 80, 72, 85, 235, 24, 254, 201, 30, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 163, 105, 151, 35, 150, 0, 0, 0, 0, 0, 0, 90, 104, 85, 95, 130, 184, 81, 8, 204, 49, 170, 44, 83, 46, 0]

class x25crc(object):
    '''x25 CRC - based on checksum.h from mavlink library'''
    def __init__(self, buf=None):
        self.crc = 0xffff
        if buf is not None:
            if isinstance(buf, str):
                self.accumulate_str(buf)
            else:
                self.accumulate(buf)

    def accumulate(self, buf):
        '''add in some more bytes'''
        accum = self.crc
        for b in buf:
            tmp = b ^ (accum & 0xff)
            tmp = (tmp ^ (tmp<<4)) & 0xFF
            accum = (accum>>8) ^ (tmp<<8) ^ (tmp<<3) ^ (tmp>>4)
        self.crc = accum

    def accumulate_str(self, buf):
        '''add in some more bytes'''
        accum = self.crc
        import array
        bytes = array.array('B')
        bytes.fromstring(buf)
        self.accumulate(bytes)