Function SafeCopyRootAtIndex

encoding/bytesutil/bytes.go:61–72

SafeCopyRootAtIndex takes a copy of an 32-byte slice in a slice of byte slices. Returns error if index out of range.

(input [][]byte, idx uint64)

// SafeCopyRootAtIndex takes a copy of an 32-byte slice in a slice of byte slices. Returns error if index out of range.
func SafeCopyRootAtIndex(input [][]byte, idx uint64) ([]byte, error) {
	if input == nil {
		return nil, nil
	}

	if uint64(len(input)) <= idx {
		return nil, fmt.Errorf("index %d out of range", idx)
	}
	item := make([]byte, 32)
	copy(item, input[idx])
	return item, nil
}

// SafeCopyBytes will copy and return a non-nil byte slice, otherwise it returns nil.
func SafeCopyBytes(cp []byte) []byte {