mirror of https://github.com/jetkvm/kvm.git
92 lines
2.1 KiB
Go
92 lines
2.1 KiB
Go
package hidrpc
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import (
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"fmt"
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"github.com/jetkvm/kvm/internal/usbgadget"
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)
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// MessageType is the type of the HID RPC message
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type MessageType byte
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const (
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TypeHandshake MessageType = 0x01
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TypeKeyboardReport MessageType = 0x02
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TypePointerReport MessageType = 0x03
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TypeWheelReport MessageType = 0x04
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TypeKeypressReport MessageType = 0x05
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TypeMouseReport MessageType = 0x06
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TypeKeyboardLedState MessageType = 0x32
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TypeKeydownState MessageType = 0x33
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)
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const (
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Version byte = 0x01 // Version of the HID RPC protocol
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)
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// ShouldUseEnqueue returns true if the message type should be enqueued to the HID queue.
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func ShouldUseEnqueue(messageType MessageType) bool {
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return messageType == TypeMouseReport
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}
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// Unmarshal unmarshals the HID RPC message from the data.
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func Unmarshal(data []byte, message *Message) error {
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l := len(data)
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if l < 1 {
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return fmt.Errorf("invalid data length: %d", l)
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}
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message.t = MessageType(data[0])
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message.d = data[1:]
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return nil
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}
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// Marshal marshals the HID RPC message to the data.
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func Marshal(message *Message) ([]byte, error) {
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if message.t == 0 {
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return nil, fmt.Errorf("invalid message type: %d", message.t)
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}
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data := make([]byte, len(message.d)+1)
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data[0] = byte(message.t)
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copy(data[1:], message.d)
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return data, nil
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}
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// NewHandshakeMessage creates a new handshake message.
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func NewHandshakeMessage() *Message {
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return &Message{
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t: TypeHandshake,
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d: []byte{Version},
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}
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}
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// NewKeyboardReportMessage creates a new keyboard report message.
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func NewKeyboardReportMessage(keys []byte, modifier uint8) *Message {
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return &Message{
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t: TypeKeyboardReport,
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d: append([]byte{modifier}, keys...),
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}
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}
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// NewKeyboardLedMessage creates a new keyboard LED message.
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func NewKeyboardLedMessage(state usbgadget.KeyboardState) *Message {
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return &Message{
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t: TypeKeyboardLedState,
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d: []byte{state.Byte()},
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}
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}
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// NewKeydownStateMessage creates a new keydown state message.
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func NewKeydownStateMessage(state usbgadget.KeysDownState) *Message {
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data := make([]byte, len(state.Keys)+1)
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data[0] = state.Modifier
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copy(data[1:], state.Keys)
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return &Message{
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t: TypeKeydownState,
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d: data,
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}
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}
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