func (s *Server) sendAck(block int16, client *Client) {
packet := make([]byte, 4)
packet[0] = 0
packet[1] = 4 // ACK
packet[2] = byte((block >> 8) & 0xFF)
packet[3] = byte((block) & 0xFF)
udp.WriteTo(packet, client.conn, client.remote)
}
func sendError(msg string, client *Client) {
if len(msg) > 507 {
msg = msg[0:508]
}
packet := make([]byte, 512)
packet[0] = 0
packet[1] = 5 // ERROR
packet[2] = 0
packet[3] = 1
copy(packet[4:], []byte(msg))
udp.WriteTo(packet[0:5+len(msg)+1], client.conn, client.remote)
}
func writeData(data []byte, client *Client) {
if len(data) > 512 {
data = data[0:512]
}
packet := make([]byte, 516)
// DATA PACKET
// 2 bytes opcode
// 2 bytes block #
// var data block
packet[0] = 0
packet[1] = 3
packet[2] = byte((client.block >> 8) & 0xFF)
packet[3] = byte((client.block) & 0xFF)
if len(data) > 0 {
copy(packet[4:], data)
}
udp.WriteTo(packet[0:4+len(data)], client.conn, client.remote)
}