+// Based on https://github.com/n7tae/mrefd/blob/master/Packet-Description.md
+// and the main M17 specification
+
+use crate::protocol::LsfFrame;
+
+macro_rules! impl_stream_id {
+ ($t:ty, $from:tt) => {
+ impl $t {
+ pub fn stream_id(&self) -> u16 {
+ u16::from_be_bytes([self.0[$from], self.0[$from + 1]])
+ }
+ }
+ };
+}
+
+macro_rules! impl_link_setup {
+ ($t:ty, $from:tt) => {
+ impl $t {
+ pub fn link_setup_frame(&self) -> LsfFrame {
+ let mut frame = LsfFrame([0; 30]);
+ frame.0[0..28].copy_from_slice(&self.0[$from..($from + 28)]);
+ frame.recalculate_crc();
+ frame
+ }
+ }
+ };
+}
+
+macro_rules! impl_link_setup_frame {
+ ($t:ty, $from:tt) => {
+ impl $t {
+ pub fn link_setup_frame(&self) -> LsfFrame {
+ let mut frame = LsfFrame([0; 30]);
+ frame.0[..].copy_from_slice(&self.0[$from..($from + 30)]);
+ frame
+ }
+ }
+ };
+}
+
+macro_rules! impl_frame_number {
+ ($t:ty, $from:tt) => {
+ impl $t {
+ pub fn frame_number(&self) -> u16 {
+ let frame_num = u16::from_be_bytes([self.0[$from], self.0[$from + 1]]);
+ frame_num & 0x7fff
+ }
+
+ pub fn is_end_of_stream(&self) -> bool {
+ let frame_num = u16::from_be_bytes([self.0[$from], self.0[$from + 1]]);
+ (frame_num & 0x8000) > 0
+ }
+ }
+ };
+}
+
+macro_rules! impl_payload {
+ ($t:ty, $from:tt, $to:tt) => {
+ impl $t {
+ pub fn payload(&self) -> &[u8] {
+ &self.0[$from..$to]
+ }
+ }
+ };
+}
+
+macro_rules! impl_modules {
+ ($t:ty, $from:tt, $to:tt) => {
+ impl $t {
+ pub fn modules(&self) -> ModulesIterator {
+ ModulesIterator::new(&self.0[$from..$to])
+ }
+ }
+ };
+}
+
+macro_rules! impl_module {
+ ($t:ty, $at:tt) => {
+ impl $t {
+ pub fn module(&self) -> char {
+ self.0[$at] as char
+ }
+ }
+ };
+}
+
+macro_rules! impl_address {
+ ($t:ty, $from:tt) => {
+ impl $t {
+ pub fn address(&self) -> crate::address::Address {
+ crate::address::decode_address(self.0[$from..($from + 6)].try_into().unwrap())
+ }
+ }
+ };
+}
+
+macro_rules! impl_trailing_crc_verify {
+ ($t:ty) => {
+ impl $t {
+ pub fn verify_integrity(&self) -> bool {
+ crate::crc::m17_crc(&self.0) == 0
+ }
+ }
+ };
+}
+
+macro_rules! impl_internal_crc {
+ ($t:ty, $from:tt, $to:tt) => {
+ impl $t {
+ pub fn verify_integrity(&self) -> bool {
+ crate::crc::m17_crc(&self.0[$from..$to]) == 0
+ }
+ }
+ };
+}
+
+macro_rules! impl_is_relayed {
+ ($t:ty) => {
+ impl $t {
+ pub fn is_relayed(&self) -> bool {
+ self.0[self.0.len() - 1] != 0
+ }
+ }
+ };
+}
+
+pub struct ModulesIterator<'a> {
+ modules: &'a [u8],
+ idx: usize,
+}
+
+impl<'a> ModulesIterator<'a> {
+ fn new(modules: &'a [u8]) -> Self {
+ Self { modules, idx: 0 }
+ }
+}
+
+impl Iterator for ModulesIterator<'_> {
+ type Item = char;
+
+ fn next(&mut self) -> Option<Self::Item> {
+ if self.modules[self.idx] == 0 {
+ return None;
+ }
+ if self.idx < self.modules.len() {
+ self.idx += 1;
+ return Some(self.modules[self.idx - 1] as char);
+ }
+ None
+ }
+}
+
+pub const MAGIC_VOICE: &[u8] = b"M17 ";
+pub const MAGIC_VOICE_HEADER: &[u8] = b"M17H";
+pub const MAGIC_VOICE_DATA: &[u8] = b"M17D";
+pub const MAGIC_PACKET: &[u8] = b"M17P";
+pub const MAGIC_ACKNOWLEDGE: &[u8] = b"ACKN";
+pub const MAGIC_CONNECT: &[u8] = b"CONN";
+pub const MAGIC_DISCONNECT: &[u8] = b"DISC";
+pub const MAGIC_LISTEN: &[u8] = b"LSTN";
+pub const MAGIC_NACK: &[u8] = b"NACK";
+pub const MAGIC_PING: &[u8] = b"PING";
+pub const MAGIC_PONG: &[u8] = b"PONG";
+
+/// Messages sent from a station/client to a reflector
+#[allow(clippy::large_enum_variant)]
+pub enum ClientMessage {
+ VoiceFull(VoiceFull),
+ VoiceHeader(VoiceHeader),
+ VoiceData(VoiceData),
+ Packet(Packet),
+ Pong(Pong),
+ Connect(Connect),
+ Listen(Listen),
+ Disconnect(Disconnect),
+}
+
+/// Messages sent from a reflector to a station/client
+#[allow(clippy::large_enum_variant)]
+pub enum ServerMessage {
+ VoiceFull(VoiceFull),
+ VoiceHeader(VoiceHeader),
+ VoiceData(VoiceData),
+ Packet(Packet),
+ Ping(Ping),
+ DisconnectAcknowledge(DisconnectAcknowledge),
+ ForceDisconnect(ForceDisconnect),
+ ConnectAcknowledge(ConnectAcknowledge),
+ ConnectNack(ConnectNack),
+}
+
+/// Messages sent and received between reflectors
+#[allow(clippy::large_enum_variant)]
+pub enum InterlinkMessage {
+ VoiceInterlink(VoiceInterlink),
+ VoiceHeaderInterlink(VoiceHeaderInterlink),
+ VoiceDataInterlink(VoiceDataInterlink),
+ PacketInterlink(PacketInterlink),
+ Ping(Ping),
+ ConnectInterlink(ConnectInterlink),
+ ConnectInterlinkAcknowledge(ConnectInterlinkAcknowledge),
+ ConnectNack(ConnectNack),
+ DisconnectInterlink(DisconnectInterlink),
+}
+
+pub struct VoiceFull(pub [u8; 54]);
+impl_stream_id!(VoiceFull, 4);
+impl_link_setup!(VoiceFull, 6);
+impl_frame_number!(VoiceFull, 34);
+impl_payload!(VoiceFull, 36, 52);
+impl_trailing_crc_verify!(VoiceFull);
+
+pub struct VoiceHeader(pub [u8; 36]);
+impl_stream_id!(VoiceHeader, 4);
+impl_link_setup!(VoiceHeader, 6);
+impl_trailing_crc_verify!(VoiceHeader);
+
+pub struct VoiceData(pub [u8; 26]);
+impl_stream_id!(VoiceData, 4);
+impl_frame_number!(VoiceData, 6);
+impl_payload!(VoiceData, 8, 24);
+impl_trailing_crc_verify!(VoiceData);
+
+pub struct Packet(pub [u8; 859]);
+impl_link_setup_frame!(Packet, 4);
+
+impl Packet {
+ pub fn payload(&self) -> &[u8] {
+ &self.0[34..]
+ }
+
+ pub fn verify_integrity(&self) -> bool {
+ self.link_setup_frame().check_crc() == 0
+ && self.payload().len() >= 4
+ && crate::crc::m17_crc(self.payload()) == 0
+ }
+}
+
+pub struct Pong(pub [u8; 10]);
+impl_address!(Pong, 4);
+
+pub struct Connect(pub [u8; 11]);
+impl_address!(Connect, 4);
+impl_module!(Connect, 10);
+
+pub struct Listen(pub [u8; 11]);
+impl_address!(Listen, 4);
+impl_module!(Listen, 10);
+
+pub struct Disconnect(pub [u8; 10]);
+impl_address!(Disconnect, 4);
+
+pub struct Ping(pub [u8; 10]);
+impl_address!(Ping, 4);
+
+pub struct DisconnectAcknowledge(pub [u8; 4]);
+
+pub struct ForceDisconnect(pub [u8; 10]);
+impl_address!(ForceDisconnect, 4);
+
+pub struct ConnectAcknowledge(pub [u8; 4]);
+
+pub struct ConnectNack(pub [u8; 4]);
+
+pub struct VoiceInterlink(pub [u8; 55]);
+impl_stream_id!(VoiceInterlink, 4);
+impl_link_setup!(VoiceInterlink, 6);
+impl_frame_number!(VoiceInterlink, 34);
+impl_payload!(VoiceInterlink, 36, 52);
+impl_internal_crc!(VoiceInterlink, 0, 54);
+impl_is_relayed!(VoiceInterlink);
+
+pub struct VoiceHeaderInterlink(pub [u8; 37]);
+impl_stream_id!(VoiceHeaderInterlink, 4);
+impl_link_setup!(VoiceHeaderInterlink, 6);
+impl_internal_crc!(VoiceHeaderInterlink, 0, 36);
+impl_is_relayed!(VoiceHeaderInterlink);
+
+pub struct VoiceDataInterlink(pub [u8; 27]);
+impl_stream_id!(VoiceDataInterlink, 4);
+impl_frame_number!(VoiceDataInterlink, 6);
+impl_payload!(VoiceDataInterlink, 8, 24);
+impl_internal_crc!(VoiceDataInterlink, 0, 24);
+impl_is_relayed!(VoiceDataInterlink);
+
+pub struct PacketInterlink(pub [u8; 860]);
+impl_link_setup_frame!(PacketInterlink, 4);
+impl_is_relayed!(PacketInterlink);
+
+impl PacketInterlink {
+ pub fn payload(&self) -> &[u8] {
+ &self.0[34..(self.0.len() - 1)]
+ }
+
+ pub fn verify_integrity(&self) -> bool {
+ self.link_setup_frame().check_crc() == 0
+ && self.payload().len() >= 4
+ && crate::crc::m17_crc(self.payload()) == 0
+ }
+}
+
+pub struct ConnectInterlink(pub [u8; 37]);
+impl_address!(ConnectInterlink, 4);
+impl_modules!(ConnectInterlink, 10, 37);
+
+pub struct ConnectInterlinkAcknowledge(pub [u8; 37]);
+impl_address!(ConnectInterlinkAcknowledge, 4);
+impl_modules!(ConnectInterlinkAcknowledge, 10, 37);
+
+pub struct DisconnectInterlink(pub [u8; 10]);
+impl_address!(DisconnectInterlink, 4);
projects / m17rt / commitdiff