QQ URL detect

detect.py

import hashlib
import struct
import sqlite3

def md5hash(buf):
    return hashlib.md5(buf.encode("utf-16")[2:]).digest()

def md5cmp(buf, postfix, a1, a2, a3, a4):
    if len(buf) < postfix:
        return False
    index = 0
    while index <= (len(buf)-postfix):
        md5 = md5hash(buf[index:index+postfix])
        if md5 == struct.pack("<IIII", a1, a2, a3, a4):
            return True
        index += 1
    return False

def detect(url):
    urlbuf = url.upper()
    return md5cmp(urlbuf, 23, 0x1C6389BA, 0xF2FA5666, 0xF2A2E0D3, 0xC892E7BA) or \
           md5cmp(urlbuf, 34, 0xB829484C, 0x520F7CC3, 0x94EC8A73, 0xD808E79) or \
           md5cmp(urlbuf, 30, 0xDDA1029, 0x9E67F3BB, 0xB18ACC45, 0x597CF438) or \
           md5cmp(urlbuf, 21, 0x2564591C, 0x5B11347B, 0x846A0F72, 0xEF704A8)

conn = sqlite3.connect("History")
cursor = conn.cursor()
cursor.execute("select url from urls")
count = 0
for row in cursor:
    url = row[0]
    if detect(url):
        print('detect: ' + url)
        count += 1
if count == 0:
    print('nothing')
cursor.close()
conn.close()