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
|
use crate::{DeserializeResult, DeserializeErr, Deserialized};
#[inline]
pub fn read_one_byte(data: &[u8]) -> DeserializeResult<u8> {
match data.split_first() {
Some((byte, rest)) => Deserialized::ok(*byte, rest),
None => Err(DeserializeErr::Eof)
}
}
#[inline]
pub const fn take(amount: usize) -> impl for<'b> Fn(&'b [u8]) -> DeserializeResult<'b, &'b [u8]> {
move |data| {
if data.len() < amount {
Err(DeserializeErr::Eof)
} else {
Ok(data.split_at(amount).into())
}
}
}
#[inline]
pub fn read_long(data: &[u8]) -> DeserializeResult<u64> {
Ok(take(8)(data)?.map(move |bytes| {
(bytes[0] as u64) << 56 |
(bytes[1] as u64) << 48 |
(bytes[2] as u64) << 40 |
(bytes[3] as u64) << 32 |
(bytes[4] as u64) << 24 |
(bytes[5] as u64) << 16 |
(bytes[6] as u64) << 8 |
(bytes[7] as u64)
}))
}
#[inline]
pub fn write_long(v: u64) -> [u8; 8] {
[
(v >> 56) as u8,
(v >> 48) as u8,
(v >> 40) as u8,
(v >> 32) as u8,
(v >> 24) as u8,
(v >> 16) as u8,
(v >> 8) as u8,
v as u8,
]
}
#[inline]
pub fn read_int(data: &[u8]) -> DeserializeResult<u32> {
Ok(take(4)(data)?.map(move |bytes| {
(bytes[0] as u32) << 24 |
(bytes[1] as u32) << 16 |
(bytes[2] as u32) << 8 |
(bytes[3] as u32)
}))
}
#[inline]
pub fn write_int(v: u32) -> [u8; 4] {
[(v >> 24) as u8, (v >> 16) as u8, (v >> 8) as u8, v as u8]
}
#[inline]
pub fn read_short(data: &[u8]) -> DeserializeResult<u16> {
Ok(take(2)(data)?.map(move |bytes| {
(bytes[0] as u16) << 8 | (bytes[1] as u16)
}))
}
#[inline]
pub fn write_short(v: u16) -> [u8; 2] {
[(v >> 8) as u8, v as u8]
}
#[inline]
pub fn hex(data: &[u8]) -> String {
let mut str = String::with_capacity(data.len() * 2);
for byte_ref in data {
let byte = *byte_ref;
str.push(hex_char_for(byte >> 4));
str.push(hex_char_for(byte & 0xF));
}
str
}
const ZERO_ASCII_CODE: u8 = 48;
const LOWER_A_ASCII_CODE: u8 = 97;
#[inline]
fn hex_char_for(half: u8) -> char {
if half > 0xF {
panic!("not defined for > 0xF (operates on half a byte)");
}
if half < 10 {
(half + ZERO_ASCII_CODE) as char
} else {
(half + (LOWER_A_ASCII_CODE - 10)) as char
}
}
#[inline]
pub fn parse_hex_char(data: u8) -> Option<u8> {
const UPPER_A_ASCII_CODE: u8 = 65;
const LOWER_F_ASCII_CODE: u8 = 102;
const UPPER_F_ASCII_CODE: u8 = 70;
const NINE_ASCII_CODE: u8 = 57;
if data >= LOWER_A_ASCII_CODE {
if data > LOWER_F_ASCII_CODE {
None
} else {
Some(10 + (data - LOWER_A_ASCII_CODE))
}
} else if data >= UPPER_A_ASCII_CODE {
if data > UPPER_F_ASCII_CODE {
None
} else {
Some(10 + (data - UPPER_A_ASCII_CODE))
}
} else if data >= ZERO_ASCII_CODE {
if data > NINE_ASCII_CODE {
None
} else {
Some(data - ZERO_ASCII_CODE)
}
} else {
None
}
}
|
