82 lines
1.4 KiB
Go
82 lines
1.4 KiB
Go
package dnsfilter
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import (
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"fmt"
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"path"
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"runtime"
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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 == true {
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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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//
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// helper functions for debugging and testing
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//
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func _Func() string {
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pc := make([]uintptr, 10) // at least 1 entry needed
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runtime.Callers(2, pc)
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f := runtime.FuncForPC(pc[0])
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return path.Base(f.Name())
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}
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func trace(format string, args ...interface{}) {
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pc := make([]uintptr, 10) // at least 1 entry needed
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runtime.Callers(2, pc)
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f := runtime.FuncForPC(pc[0])
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var buf strings.Builder
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buf.WriteString(fmt.Sprintf("%s(): ", path.Base(f.Name())))
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text := fmt.Sprintf(format, args...)
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buf.WriteString(text)
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if len(text) == 0 || text[len(text)-1] != '\n' {
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buf.WriteRune('\n')
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}
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fmt.Print(buf.String())
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}
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