| 170 | } |
| 171 | |
| 172 | func RandHost() string { |
| 173 | n := 8 |
| 174 | b := make([]byte, n) |
| 175 | // A rand.Int63() generates 63 random bits, enough for letterIdMax letters! |
| 176 | for i, cache, remain := n-1, randInt63(), letterIdMax; i >= 1; { |
| 177 | if remain == 0 { |
| 178 | cache, remain = randInt63(), letterIdMax |
| 179 | } |
| 180 | if idx := int(cache & letterIdMask); idx < len(letters) { |
| 181 | b[i] = letters[idx] |
| 182 | i-- |
| 183 | } |
| 184 | cache >>= letterIdBits |
| 185 | remain-- |
| 186 | } |
| 187 | |
| 188 | b[5] = byte(0x2e) |
| 189 | return *(*string)(unsafe.Pointer(&b)) |
| 190 | } |
| 191 | |
| 192 | func FilterJs(u string) bool { |
| 193 | if commonFilter(u) { |