mirror of https://github.com/nealey/vail.git
71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
package main
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import (
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"bytes"
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"encoding/binary"
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"log"
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)
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// VailMessage is a single Vail message.
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type Message struct {
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// Relative time in ms of this message.
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// These timestamps need to be consistent, but the offset can be anything.
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// ECMAScript `performance.now()` is ideal.
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Timestamp uint64
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// Message timing in ms.
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// Timings alternate between tone and silence.
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// For example, `A` could be sent as [80, 80, 240]
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Duration []uint8
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}
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func (m Message) MarshalBinary() ([]byte, error) {
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var w bytes.Buffer
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if err := binary.Write(&w, binary.BigEndian, m.Timestamp); err != nil {
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return nil, err
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}
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dlen := uint16(len(m.Duration))
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if err := binary.Write(&w, binary.BigEndian, dlen); err != nil {
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return nil, err
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}
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if err := binary.Write(&w, binary.BigEndian, m.Duration); err != nil {
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return nil, err
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}
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return w.Bytes(), nil
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}
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func (m *Message) UnmarshalBinary(data []byte) error {
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r := bytes.NewReader(data)
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if err := binary.Read(r, binary.BigEndian, &m.Timestamp); err != nil {
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return err
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}
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log.Printf("timestamp %x", m.Timestamp)
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var dlen uint16
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if err := binary.Read(r, binary.BigEndian, &dlen); err != nil {
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return err
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}
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m.Duration = make([]uint8, dlen)
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if err := binary.Read(r, binary.BigEndian, &m.Duration); err != nil {
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return err
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}
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return nil
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}
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func (m Message) Equal(m2 Message) bool {
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if m.Timestamp != m2.Timestamp {
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return false
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}
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if len(m.Duration) != len(m2.Duration) {
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return false
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}
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for i := range m.Duration {
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if m.Duration[i] != m2.Duration[i] {
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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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