rtc_datachannel/message/
message_type.rs1use super::*;
2use shared::error::{Error, Result};
3
4pub(crate) const MESSAGE_TYPE_ACK: u8 = 0x02;
6pub(crate) const MESSAGE_TYPE_OPEN: u8 = 0x03;
7pub(crate) const MESSAGE_TYPE_LEN: usize = 1;
8
9#[derive(Eq, PartialEq, Copy, Clone, Debug)]
11pub enum MessageType {
12 DataChannelAck,
13 DataChannelOpen,
14}
15
16impl MarshalSize for MessageType {
17 fn marshal_size(&self) -> usize {
18 MESSAGE_TYPE_LEN
19 }
20}
21
22impl Marshal for MessageType {
23 fn marshal_to(&self, mut buf: &mut [u8]) -> Result<usize> {
24 let b = match self {
25 MessageType::DataChannelAck => MESSAGE_TYPE_ACK,
26 MessageType::DataChannelOpen => MESSAGE_TYPE_OPEN,
27 };
28
29 buf.put_u8(b);
30
31 Ok(1)
32 }
33}
34
35impl Unmarshal for MessageType {
36 fn unmarshal<B>(buf: &mut B) -> Result<Self>
37 where
38 B: Buf,
39 {
40 let required_len = MESSAGE_TYPE_LEN;
41 if buf.remaining() < required_len {
42 return Err(Error::UnexpectedEndOfBuffer {
43 expected: required_len,
44 actual: buf.remaining(),
45 });
46 }
47
48 let b = buf.get_u8();
49
50 match b {
51 MESSAGE_TYPE_ACK => Ok(Self::DataChannelAck),
52 MESSAGE_TYPE_OPEN => Ok(Self::DataChannelOpen),
53 _ => Err(Error::InvalidMessageType(b)),
54 }
55 }
56}
57
58#[cfg(test)]
59mod tests {
60 use bytes::{Bytes, BytesMut};
61
62 use super::*;
63
64 #[test]
65 fn test_message_type_unmarshal_open_success() -> Result<()> {
66 let mut bytes = Bytes::from_static(&[0x03]);
67 let msg_type = MessageType::unmarshal(&mut bytes)?;
68
69 assert_eq!(msg_type, MessageType::DataChannelOpen);
70
71 Ok(())
72 }
73
74 #[test]
75 fn test_message_type_unmarshal_ack_success() -> Result<()> {
76 let mut bytes = Bytes::from_static(&[0x02]);
77 let msg_type = MessageType::unmarshal(&mut bytes)?;
78
79 assert_eq!(msg_type, MessageType::DataChannelAck);
80 Ok(())
81 }
82
83 #[test]
84 fn test_message_type_unmarshal_invalid() -> Result<()> {
85 let mut bytes = Bytes::from_static(&[0x01]);
86 match MessageType::unmarshal(&mut bytes) {
87 Ok(_) => panic!("expected Error, but got Ok"),
88 Err(err) => {
89 if Error::InvalidMessageType(0x01) == err {
90 return Ok(());
91 }
92 panic!(
93 "unexpected err {:?}, want {:?}",
94 err,
95 Error::InvalidMessageType(0x01)
96 );
97 }
98 }
99 }
100
101 #[test]
102 fn test_message_type_marshal_size() -> Result<()> {
103 let ack = MessageType::DataChannelAck;
104 let marshal_size = ack.marshal_size();
105
106 assert_eq!(marshal_size, MESSAGE_TYPE_LEN);
107 Ok(())
108 }
109
110 #[test]
111 fn test_message_type_marshal() -> Result<()> {
112 let mut buf = BytesMut::with_capacity(MESSAGE_TYPE_LEN);
113 buf.resize(MESSAGE_TYPE_LEN, 0u8);
114 let msg_type = MessageType::DataChannelAck;
115 let n = msg_type.marshal_to(&mut buf)?;
116 let bytes = buf.freeze();
117
118 assert_eq!(n, MESSAGE_TYPE_LEN);
119 assert_eq!(&bytes[..], &[0x02]);
120 Ok(())
121 }
122}