def calculate_checksum()

in tools/warmcookie/warmcookie_http.py [0:0]

• 14 lines of code
• 6 McCabe index (conditional complexity)

def calculate_checksum(str_input, i):
    if i == 0:
        i = 0xFFFFFFFF
    if i == -1:
        i = 0

    for idx in range(0, len(str_input), 2):
        v6 = str_input[idx] | (str_input[idx + 1] << 8)
        for _ in range(16):
            if (v6 ^ i) & 1:
                i = ((i >> 1) ^ 0xEDB88320) & 0xFFFFFFFF
            else:
                i = (i >> 1) & 0xFFFFFFFF
            v6 >>= 1

    return ~i & 0xFFFFFFFF