oxicode 0.2.1

A modern binary serialization library - successor to bincode
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
159
160
161
162
163
164
165
166
167
168
169
170
171
172

//! Variable-length encoding for unsigned integers

use super::{SINGLE_BYTE_MAX, U128_BYTE, U16_BYTE, U32_BYTE, U64_BYTE};
use crate::{config::Endianness, encode::Writer, error::Result};

/// Encode a u16 value as a varint
#[inline(always)]
pub fn varint_encode_u16<W: Writer>(writer: &mut W, endian: Endianness, val: u16) -> Result<()> {
    if val <= SINGLE_BYTE_MAX as u16 {
        writer.write(&[val as u8])
    } else {
        let val_bytes = match endian {
            Endianness::Big => val.to_be_bytes(),
            Endianness::Little => val.to_le_bytes(),
        };
        let buf = [U16_BYTE, val_bytes[0], val_bytes[1]];
        writer.write(&buf)
    }
}

/// Encode a u32 value as a varint
#[inline(always)]
pub fn varint_encode_u32<W: Writer>(writer: &mut W, endian: Endianness, val: u32) -> Result<()> {
    if val <= SINGLE_BYTE_MAX as u32 {
        writer.write(&[val as u8])
    } else if val <= u16::MAX as u32 {
        let val_bytes = match endian {
            Endianness::Big => (val as u16).to_be_bytes(),
            Endianness::Little => (val as u16).to_le_bytes(),
        };
        let buf = [U16_BYTE, val_bytes[0], val_bytes[1]];
        writer.write(&buf)
    } else {
        let val_bytes = match endian {
            Endianness::Big => val.to_be_bytes(),
            Endianness::Little => val.to_le_bytes(),
        };
        let buf = [
            U32_BYTE,
            val_bytes[0],
            val_bytes[1],
            val_bytes[2],
            val_bytes[3],
        ];
        writer.write(&buf)
    }
}

/// Encode a u64 value as a varint
#[inline(always)]
pub fn varint_encode_u64<W: Writer>(writer: &mut W, endian: Endianness, val: u64) -> Result<()> {
    if val <= SINGLE_BYTE_MAX as u64 {
        writer.write(&[val as u8])
    } else if val <= u16::MAX as u64 {
        let val_bytes = match endian {
            Endianness::Big => (val as u16).to_be_bytes(),
            Endianness::Little => (val as u16).to_le_bytes(),
        };
        let buf = [U16_BYTE, val_bytes[0], val_bytes[1]];
        writer.write(&buf)
    } else if val <= u32::MAX as u64 {
        let val_bytes = match endian {
            Endianness::Big => (val as u32).to_be_bytes(),
            Endianness::Little => (val as u32).to_le_bytes(),
        };
        let buf = [
            U32_BYTE,
            val_bytes[0],
            val_bytes[1],
            val_bytes[2],
            val_bytes[3],
        ];
        writer.write(&buf)
    } else {
        let val_bytes = match endian {
            Endianness::Big => val.to_be_bytes(),
            Endianness::Little => val.to_le_bytes(),
        };
        let buf = [
            U64_BYTE,
            val_bytes[0],
            val_bytes[1],
            val_bytes[2],
            val_bytes[3],
            val_bytes[4],
            val_bytes[5],
            val_bytes[6],
            val_bytes[7],
        ];
        writer.write(&buf)
    }
}

/// Encode a u128 value as a varint
#[inline(always)]
pub fn varint_encode_u128<W: Writer>(writer: &mut W, endian: Endianness, val: u128) -> Result<()> {
    if val <= SINGLE_BYTE_MAX as u128 {
        writer.write(&[val as u8])
    } else if val <= u16::MAX as u128 {
        let val_bytes = match endian {
            Endianness::Big => (val as u16).to_be_bytes(),
            Endianness::Little => (val as u16).to_le_bytes(),
        };
        let buf = [U16_BYTE, val_bytes[0], val_bytes[1]];
        writer.write(&buf)
    } else if val <= u32::MAX as u128 {
        let val_bytes = match endian {
            Endianness::Big => (val as u32).to_be_bytes(),
            Endianness::Little => (val as u32).to_le_bytes(),
        };
        let buf = [
            U32_BYTE,
            val_bytes[0],
            val_bytes[1],
            val_bytes[2],
            val_bytes[3],
        ];
        writer.write(&buf)
    } else if val <= u64::MAX as u128 {
        let val_bytes = match endian {
            Endianness::Big => (val as u64).to_be_bytes(),
            Endianness::Little => (val as u64).to_le_bytes(),
        };
        let buf = [
            U64_BYTE,
            val_bytes[0],
            val_bytes[1],
            val_bytes[2],
            val_bytes[3],
            val_bytes[4],
            val_bytes[5],
            val_bytes[6],
            val_bytes[7],
        ];
        writer.write(&buf)
    } else {
        let val_bytes = match endian {
            Endianness::Big => val.to_be_bytes(),
            Endianness::Little => val.to_le_bytes(),
        };
        let buf = [
            U128_BYTE,
            val_bytes[0],
            val_bytes[1],
            val_bytes[2],
            val_bytes[3],
            val_bytes[4],
            val_bytes[5],
            val_bytes[6],
            val_bytes[7],
            val_bytes[8],
            val_bytes[9],
            val_bytes[10],
            val_bytes[11],
            val_bytes[12],
            val_bytes[13],
            val_bytes[14],
            val_bytes[15],
        ];
        writer.write(&buf)
    }
}

/// Encode a usize value as a varint (encoded as u64)
#[inline(always)]
pub fn varint_encode_usize<W: Writer>(
    writer: &mut W,
    endian: Endianness,
    val: usize,
) -> Result<()> {
    varint_encode_u64(writer, endian, val as u64)
}