go/src/cmd/internal/pgo/deserialize.go

// IsSerialized returns true if r is a serialized Profile.
//
// IsSerialized only peeks at r, so seeking back after calling is not
// necessary.
func IsSerialized(r *bufio.Reader) (bool, error) { … }

// FromSerialized parses a profile from serialization output of Profile.WriteTo.
func FromSerialized(r io.Reader) (*Profile, error) { … }