1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
#[macro_use]
extern crate serde_derive;
extern crate serde_cbor;
extern crate byteorder;
use std::io::{Read, Cursor, Error};
use byteorder::{BigEndian, WriteBytesExt, ReadBytesExt};
#[derive(Serialize, Deserialize, Debug)]
pub enum KeyUser {
Key (u64),
User (String)
}
#[derive(Serialize, Deserialize, Debug)]
pub struct Msg {
pub keyuser: KeyUser,
pub channel: String,
pub message: Vec<u8>,
}
pub fn message_encode(msg: &Msg) -> Vec<u8> {
let encoded = serde_cbor::to_vec(msg);
match encoded {
Ok(encoded) => encoded,
Err(err) => {
println!("Error on encode: {}", err);
Vec::new()
}
}
}
pub fn message_decode(slice: &[u8]) -> Msg {
let value = serde_cbor::from_slice(slice);
match value {
Ok(value) => value,
Err(err) => {
println!("Error on decode: {}", err);
Msg { keyuser: KeyUser::User("".to_string()), channel: "".to_string(), message: Vec::new() }
}
}
}
pub fn read_n<R>(reader: R, bytes_to_read: u64) -> (Result<usize, Error>, Vec<u8>)
where R: Read,
{
let mut buf = vec![];
let mut chunk = reader.take(bytes_to_read);
let status = chunk.read_to_end(&mut buf);
(status, buf)
}
pub fn read_hdr_type(hdr: &[u8]) -> u32 {
let mut buf = Cursor::new(&hdr[..]);
let num = buf.read_u32::<BigEndian>().unwrap();
num >> 24
}
pub fn read_hdr_len(hdr: &[u8]) -> usize {
let mut buf = Cursor::new(&hdr[..]);
let num = buf.read_u32::<BigEndian>().unwrap();
(num & 0xfff) as usize
}
pub fn write_hdr(len: usize) -> Vec<u8> {
let hdr = (('M' as u32) << 24) | len as u32;
let mut msgv = vec![];
msgv.write_u32::<BigEndian>(hdr).unwrap();
msgv
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_encode_decode_msg() {
let orig_msg = Msg { keyuser: KeyUser::User("User".to_string()), channel: "Channel".to_string(), message: "a test msg".to_string().into_bytes() };
let orig_user = match orig_msg.keyuser {
KeyUser::User(user) => user,
_ => "".to_string(),
};
let msg = Msg { keyuser: KeyUser::User("User".to_string()), channel: "Channel".to_string(), message: "a test msg".to_string().into_bytes() };
let cbor_msg = message_encode(&msg);
let decoded_msg = message_decode(&cbor_msg);
let decoded_user = match decoded_msg.keyuser {
KeyUser::User(user) => user,
_ => "".to_string(),
};
assert_eq!(decoded_user, orig_user);
assert_eq!(decoded_msg.channel, orig_msg.channel);
assert_eq!(decoded_msg.message, orig_msg.message);
}
}