-
Notifications
You must be signed in to change notification settings - Fork 1
/
utils.rs
164 lines (140 loc) · 4.08 KB
/
utils.rs
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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
// Common utils
// IETF Protocol Numbers
pub const IPV4: u8 = 0x21;
pub const IPV6: u8 = 0x57;
pub const IPV4V6: u8 = 0x8d;
// Telephony numbering plans
pub const E164: u8 = 0x01;
pub const E212: u8 = 0x06;
// Encode string into TBCD format, return slice of bytes
pub fn tbcd_encode(number: &str) -> Vec<u8> {
let mut chr: Vec<u8> = number
.chars()
.flat_map(|c| c.to_digit(10))
.map(|x| x as u8)
.collect();
if chr.len() % 2 != 0 {
chr.push(0x0f);
}
let tbcd: Vec<u8> = chr
.iter()
.step_by(2)
.zip(chr.iter().skip(1).step_by(2))
.map(|(a, b)| (b << 4) | a)
.collect();
tbcd
}
#[test]
fn tbcd_encode_test() {
let test_number: &str = "987432101314063";
let encoded_number: [u8; 8] = [137, 71, 35, 1, 49, 65, 96, 243];
assert_eq!(tbcd_encode(test_number), encoded_number);
}
// Decode slice of bytes from TBCD to string
pub fn tbcd_decode(buffer: &[u8]) -> String {
let mut data: Vec<u8> = vec![];
for x in buffer.iter() {
data.push(x & 0b00001111);
data.push(x >> 4);
}
let result: String = data
.iter()
.flat_map(|c| char::from_digit(*c as u32, 10))
.into_iter()
.collect();
result
}
#[test]
fn tbcd_decode_test() {
let test_number: String = "987432101314063".to_string();
let encoded_number: [u8; 8] = [137, 71, 35, 1, 49, 65, 96, 243];
assert_eq!(tbcd_decode(&encoded_number), test_number);
}
// Encode MCC and MNC
pub fn mcc_mnc_encode(mcc: u16, mnc: u16) -> Vec<u8> {
let mcc_digits: Vec<u8> = to_digits(mcc);
let mnc_digits: Vec<u8> = to_digits(mnc);
let mut result: Vec<u8> = vec![];
result.push(mcc_digits[1] << 4 | mcc_digits[0]);
if mnc_digits.len() == 2 {
result.push(0b1111 << 4 | mcc_digits[2]);
} else {
result.push(mnc_digits[2] << 4 | mcc_digits[2]);
}
result.push(mnc_digits[1] << 4 | mnc_digits[0]);
result
}
#[test]
fn mcc_mnc_encode_test() {
let test_mcc: u16 = 262;
let test_mnc: u16 = 1;
let encoded_number: [u8; 3] = [0x62, 0xf2, 0x10];
assert_eq!(mcc_mnc_encode(test_mcc, test_mnc), encoded_number);
}
// Decode MCC and MNC
pub fn mcc_mnc_decode(buffer: &[u8]) -> (u16, u16) {
let mut mcc_digits: Vec<u8> = vec![];
let mut mnc_digits: Vec<u8> = vec![];
mcc_digits.push(buffer[0] & 0b1111);
mcc_digits.push(buffer[0] >> 4);
mcc_digits.push(buffer[1] & 0b00001111);
mnc_digits.push(buffer[2] & 0b1111);
mnc_digits.push(buffer[2] >> 4);
if buffer[1] >> 4 != 0b1111 {
mnc_digits.push(buffer[1] >> 4);
}
let (mut mcc, mut mnc) = (0, 0);
if let Ok(i) = mcc_digits
.iter()
.flat_map(|c| char::from_digit(*c as u32, 10))
.collect::<String>()
.parse::<u16>()
{
mcc = i;
}
if let Ok(i) = mnc_digits
.iter()
.flat_map(|c| char::from_digit(*c as u32, 10))
.collect::<String>()
.parse::<u16>()
{
mnc = i;
}
(mcc, mnc)
}
#[test]
fn mcc_mnc_decode_test() {
let test_mcc: u16 = 262;
let test_mnc: u16 = 1;
let encoded_number: [u8; 3] = [0x62, 0xf2, 0x10];
assert_eq!(mcc_mnc_decode(&encoded_number), (test_mcc, test_mnc));
}
// Convert unsigned int to vector of digits
pub fn to_digits<T: ToString>(i: T) -> Vec<u8> {
let mut result: Vec<u8> = i
.to_string()
.chars()
.flat_map(|c| c.to_digit(10))
.map(|x| x as u8)
.collect();
if result.len() == 1 {
result.insert(0, 0);
}
result
}
// Set the right size of GTP message based on buffer size
pub fn set_length(buffer: &mut Vec<u8>) {
let size = ((buffer.len() - 8) as u16).to_be_bytes();
buffer[2] = size[0];
buffer[3] = size[1];
}
// Set the right size of IE based on buffer size
pub fn set_tlv_ie_length(buffer: &mut Vec<u8>) {
let size = ((buffer.len() - 3) as u16).to_be_bytes();
buffer[1] = size[0];
buffer[2] = size[1];
}
// Check TLV IE length vs buffer size
pub fn check_tlv_ie_buffer(length: u16, buffer: &[u8]) -> bool {
(length + 3) as usize <= buffer.len()
}