package change

import "io"

func Write(changes []Change, w io.Writer) error {
	count := uint64(len(changes))
	if err := writeBin(w, count); err != nil {
		return err
	}
	for _, c := range changes {
		if err := c.writeTo(w); err != nil {
			return err
		}
	}
	return nil
}

func Read(changes []Change, r io.Reader) ([]Change, error) {
	var count uint64
	if err := readBin(r, &count); err != nil {
		return changes, err
	}

	if uint64(len(changes)) < count {
		changes = make([]Change, count)
	}
	changes = changes[:count]

	for i := range changes {
		if err := changes[i].readFrom(r); err != nil {
			return changes, err
		}
	}
	return changes, nil
}