desert_core 0.1.5

Binary serialization library for Rust (core crate)
Documentation 
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

use crate::Error;
use bytes::{BufMut, BytesMut};
use flate2::read::DeflateEncoder;
use flate2::Compression;
use std::io::Read;

use crate::error::Result;

pub trait BinaryOutput {
    fn write_u8(&mut self, value: u8);
    fn write_bytes(&mut self, bytes: &[u8]);

    fn write_i8(&mut self, value: i8) {
        self.write_u8(value as u8);
    }

    fn write_u16(&mut self, value: u16) {
        self.write_bytes(&value.to_be_bytes())
    }

    fn write_i16(&mut self, value: i16) {
        self.write_bytes(&value.to_be_bytes())
    }

    fn write_u32(&mut self, value: u32) {
        self.write_bytes(&value.to_be_bytes())
    }

    fn write_i32(&mut self, value: i32) {
        self.write_bytes(&value.to_be_bytes())
    }

    fn write_u64(&mut self, value: u64) {
        self.write_bytes(&value.to_be_bytes())
    }

    fn write_i64(&mut self, value: i64) {
        self.write_bytes(&value.to_be_bytes())
    }

    fn write_u128(&mut self, value: u128) {
        self.write_bytes(&value.to_be_bytes())
    }

    fn write_i128(&mut self, value: i128) {
        self.write_bytes(&value.to_be_bytes())
    }

    fn write_f32(&mut self, value: f32) {
        self.write_bytes(&value.to_be_bytes())
    }

    fn write_f64(&mut self, value: f64) {
        self.write_bytes(&value.to_be_bytes())
    }

    fn write_var_u32(&mut self, value: u32) {
        if value < 0x80 {
            self.write_u8(value as u8);
        } else if value < 0x4000 {
            let buf = [((value & 0x7F) | 0x80) as u8, (value >> 7) as u8];
            self.write_bytes(&buf);
        } else if value < 0x200000 {
            let buf = [
                ((value & 0x7F) | 0x80) as u8,
                ((value >> 7) | 0x80) as u8,
                (value >> 14) as u8,
            ];
            self.write_bytes(&buf);
        } else if value < 0x10000000 {
            let buf = [
                ((value & 0x7F) | 0x80) as u8,
                ((value >> 7) | 0x80) as u8,
                ((value >> 14) | 0x80) as u8,
                (value >> 21) as u8,
            ];
            self.write_bytes(&buf);
        } else {
            let buf = [
                ((value & 0x7F) | 0x80) as u8,
                ((value >> 7) | 0x80) as u8,
                ((value >> 14) | 0x80) as u8,
                ((value >> 21) | 0x80) as u8,
                (value >> 28) as u8,
            ];
            self.write_bytes(&buf);
        }
    }

    fn write_var_i32(&mut self, value: i32) {
        let adjusted = ((value << 1) ^ (value >> 31)) as u32;
        self.write_var_u32(adjusted);
    }

    fn write_compressed(&mut self, bytes: &[u8], opts: Compression) -> Result<()> {
        let mut deflater = DeflateEncoder::new(bytes, opts);
        let mut compressed = Vec::new();
        deflater
            .read_to_end(&mut compressed)
            .map_err(|err| Error::CompressionFailure(format!("{err}")))?;
        self.write_var_u32(bytes.len() as u32);
        self.write_var_u32(compressed.len() as u32);
        self.write_bytes(&compressed);
        Ok(())
    }
}

impl BinaryOutput for BytesMut {
    fn write_u8(&mut self, value: u8) {
        self.put_u8(value);
    }

    fn write_bytes(&mut self, bytes: &[u8]) {
        self.put_slice(bytes);
    }
}

impl BinaryOutput for Vec<u8> {
    #[inline(always)]
    fn write_u8(&mut self, value: u8) {
        self.push(value);
    }

    #[inline(always)]
    fn write_bytes(&mut self, bytes: &[u8]) {
        self.extend_from_slice(bytes);
    }
}

pub struct SizeCalculator {
    size: usize,
}

impl SizeCalculator {
    pub fn new() -> Self {
        SizeCalculator { size: 0 }
    }

    pub fn size(&self) -> usize {
        self.size
    }
}

impl Default for SizeCalculator {
    fn default() -> Self {
        Self::new()
    }
}

impl BinaryOutput for SizeCalculator {
    fn write_u8(&mut self, _value: u8) {
        self.size += 1;
    }

    fn write_bytes(&mut self, bytes: &[u8]) {
        self.size += bytes.len();
    }
}