isle/go/nebula/util.go

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package nebula
import (
"bytes"
"errors"
"fmt"
"github.com/jxskiss/base62"
)
func encodeWithPrefix(prefix []byte, b []byte) []byte {
res := make([]byte, 0, len(prefix)+len(b)*4)
res = append(res, prefix...)
res = base62.EncodeToBuf(res, b)
return res
}
func decodeWithPrefix(prefix []byte, b []byte) ([]byte, error) {
if len(b) < len(prefix) {
return nil, errors.New("input is too short")
} else if !bytes.HasPrefix(b, prefix) {
return nil, fmt.Errorf("missing expected prefix %q", prefix)
}
return base62.Decode(b[len(prefix):])
}