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73 lines
1.3 KiB
73 lines
1.3 KiB
package common
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import (
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"bytes"
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)
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// Fingerprint returns the first 6 bytes of a byte slice.
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// If the slice is less than 6 bytes, the fingerprint
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// contains trailing zeroes.
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func Fingerprint(slice []byte) []byte {
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fingerprint := make([]byte, 6)
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copy(fingerprint, slice)
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return fingerprint
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}
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func IsZeros(slice []byte) bool {
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for _, byt := range slice {
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if byt != byte(0) {
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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 RightPadBytes(slice []byte, l int) []byte {
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if l < len(slice) {
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return slice
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}
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padded := make([]byte, l)
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copy(padded[0:len(slice)], slice)
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return padded
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}
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func LeftPadBytes(slice []byte, l int) []byte {
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if l < len(slice) {
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return slice
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}
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padded := make([]byte, l)
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copy(padded[l-len(slice):], slice)
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return padded
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}
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func TrimmedString(b []byte) string {
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trimSet := string([]byte{0})
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return string(bytes.TrimLeft(b, trimSet))
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}
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// PrefixEndBytes returns the end byteslice for a noninclusive range
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// that would include all byte slices for which the input is the prefix
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func PrefixEndBytes(prefix []byte) []byte {
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if prefix == nil {
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return nil
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}
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end := make([]byte, len(prefix))
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copy(end, prefix)
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finished := false
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for !finished {
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if end[len(end)-1] != byte(255) {
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end[len(end)-1]++
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finished = true
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} else {
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end = end[:len(end)-1]
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if len(end) == 0 {
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end = nil
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finished = true
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}
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}
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}
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return end
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}
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