sqlx_mysql/io/
buf_mut.rs

1use bytes::BufMut;
2
3pub trait MySqlBufMutExt: BufMut {
4    fn put_uint_lenenc(&mut self, v: u64);
5
6    fn put_str_lenenc(&mut self, v: &str);
7
8    fn put_bytes_lenenc(&mut self, v: &[u8]);
9}
10
11impl MySqlBufMutExt for Vec<u8> {
12    fn put_uint_lenenc(&mut self, v: u64) {
13        // https://dev.mysql.com/doc/internals/en/integer.html
14        // https://mariadb.com/kb/en/library/protocol-data-types/#length-encoded-integers
15
16        let encoded_le = v.to_le_bytes();
17
18        match v {
19            0..=250 => self.push(encoded_le[0]),
20            251..=0xFF_FF => {
21                self.push(0xfc);
22                self.extend_from_slice(&encoded_le[..2]);
23            }
24            0x1_00_00..=0xFF_FF_FF => {
25                self.push(0xfd);
26                self.extend_from_slice(&encoded_le[..3]);
27            }
28            _ => {
29                self.push(0xfe);
30                self.extend_from_slice(&encoded_le);
31            }
32        }
33    }
34
35    fn put_str_lenenc(&mut self, v: &str) {
36        self.put_bytes_lenenc(v.as_bytes());
37    }
38
39    fn put_bytes_lenenc(&mut self, v: &[u8]) {
40        self.put_uint_lenenc(v.len() as u64);
41        self.extend(v);
42    }
43}
44
45#[test]
46fn test_encodes_int_lenenc_u8() {
47    let mut buf = Vec::with_capacity(1024);
48    buf.put_uint_lenenc(0xFA as u64);
49
50    assert_eq!(&buf[..], b"\xFA");
51}
52
53#[test]
54fn test_encodes_int_lenenc_u16() {
55    let mut buf = Vec::with_capacity(1024);
56    buf.put_uint_lenenc(std::u16::MAX as u64);
57
58    assert_eq!(&buf[..], b"\xFC\xFF\xFF");
59}
60
61#[test]
62fn test_encodes_int_lenenc_u24() {
63    let mut buf = Vec::with_capacity(1024);
64    buf.put_uint_lenenc(0xFF_FF_FF as u64);
65
66    assert_eq!(&buf[..], b"\xFD\xFF\xFF\xFF");
67}
68
69#[test]
70fn test_encodes_int_lenenc_u64() {
71    let mut buf = Vec::with_capacity(1024);
72    buf.put_uint_lenenc(std::u64::MAX);
73
74    assert_eq!(&buf[..], b"\xFE\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF");
75}
76
77#[test]
78fn test_encodes_int_lenenc_fb() {
79    let mut buf = Vec::with_capacity(1024);
80    buf.put_uint_lenenc(0xFB as u64);
81
82    assert_eq!(&buf[..], b"\xFC\xFB\x00");
83}
84
85#[test]
86fn test_encodes_int_lenenc_fc() {
87    let mut buf = Vec::with_capacity(1024);
88    buf.put_uint_lenenc(0xFC as u64);
89
90    assert_eq!(&buf[..], b"\xFC\xFC\x00");
91}
92
93#[test]
94fn test_encodes_int_lenenc_fd() {
95    let mut buf = Vec::with_capacity(1024);
96    buf.put_uint_lenenc(0xFD as u64);
97
98    assert_eq!(&buf[..], b"\xFC\xFD\x00");
99}
100
101#[test]
102fn test_encodes_int_lenenc_fe() {
103    let mut buf = Vec::with_capacity(1024);
104    buf.put_uint_lenenc(0xFE as u64);
105
106    assert_eq!(&buf[..], b"\xFC\xFE\x00");
107}
108
109#[test]
110fn test_encodes_int_lenenc_ff() {
111    let mut buf = Vec::with_capacity(1024);
112    buf.put_uint_lenenc(0xFF as u64);
113
114    assert_eq!(&buf[..], b"\xFC\xFF\x00");
115}
116
117#[test]
118fn test_encodes_string_lenenc() {
119    let mut buf = Vec::with_capacity(1024);
120    buf.put_str_lenenc("random_string");
121
122    assert_eq!(&buf[..], b"\x0Drandom_string");
123}
124
125#[test]
126fn test_encodes_byte_lenenc() {
127    let mut buf = Vec::with_capacity(1024);
128    buf.put_bytes_lenenc(b"random_string");
129
130    assert_eq!(&buf[..], b"\x0Drandom_string");
131}
sqlx_mysql/io/buf_mut.rs

sqlx_mysql/io/
buf_mut.rs
