Method HasDuplicates

internal/http2/frame.go:839–867

HasDuplicates reports whether f contains any duplicate setting IDs.

()

// HasDuplicates reports whether f contains any duplicate setting IDs.
func (f *SettingsFrame) HasDuplicates() bool {
	num := f.NumSettings()
	if num == 0 {
		return false
	}
	// If it's small enough (the common case), just do the n^2
	// thing and avoid a map allocation.
	if num < 10 {
		for i := 0; i < num; i++ {
			idi := f.Setting(i).ID
			for j := i + 1; j < num; j++ {
				idj := f.Setting(j).ID
				if idi == idj {
					return true
				}
			}
		}
		return false
	}
	seen := map[http2.SettingID]bool{}
	for i := 0; i < num; i++ {
		id := f.Setting(i).ID
		if seen[id] {
			return true
		}
		seen[id] = true
	}
	return false
}

// ForeachSetting runs fn for each setting.
// It stops and returns the first error.