55 lines
804 B
Go
55 lines
804 B
Go
package dnsfilter
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import (
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"strings"
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"sync/atomic"
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)
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func isValidRule(rule string) bool {
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if len(rule) < 4 {
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return false
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}
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if rule[0] == '!' {
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return false
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}
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if rule[0] == '#' {
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return false
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}
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if strings.HasPrefix(rule, "[Adblock") {
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return false
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}
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masks := []string{
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"##",
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"#@#",
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"#$#",
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"#@$#",
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"$$",
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"$@$",
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"#%#",
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"#@%#",
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}
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for _, mask := range masks {
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if strings.Contains(rule, mask) {
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return false
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}
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}
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return true
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}
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func updateMax(valuePtr *int64, maxPtr *int64) {
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for {
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current := atomic.LoadInt64(valuePtr)
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max := atomic.LoadInt64(maxPtr)
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if current <= max {
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break
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}
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swapped := atomic.CompareAndSwapInt64(maxPtr, max, current)
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if swapped {
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break
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}
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// swapping failed because value has changed after reading, try again
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}
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}
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