1use alloc::vec::Vec;
2
3#[cfg(feature = "std")]
4use std::io::{self, Write};
5
6#[inline]
7pub(crate) fn write_hex_to_vec(e: u8, output: &mut Vec<u8>) {
8 output.reserve(6);
9
10 let length = output.len();
11
12 unsafe {
13 output.set_len(length + 6);
14 }
15
16 let output = &mut output[length..];
17
18 output[0] = b'&';
19 output[1] = b'#';
20 output[2] = b'x';
21 output[5] = b';';
22
23 let he = e >> 4;
24 let le = e & 0xF;
25
26 output[3] = if he >= 10 {
27 b'A' - 10 + he
28 } else {
29 b'0' + he
30 };
31
32 output[4] = if le >= 10 {
33 b'A' - 10 + le
34 } else {
35 b'0' + le
36 };
37}
38
39#[cfg(feature = "std")]
40#[inline]
41pub(crate) fn write_hex_to_writer<W: Write>(e: u8, output: &mut W) -> Result<(), io::Error> {
42 output.write_fmt(args:format_args!("&#x{e:02X};"))
43}
44
45#[inline]
46pub(crate) fn write_html_entity_to_vec(e: u8, output: &mut Vec<u8>) {
47 match e {
48 b'&' => output.extend_from_slice(b"&amp;"),
49 b'<' => output.extend_from_slice(b"&lt;"),
50 b'>' => output.extend_from_slice(b"&gt;"),
51 b'"' => output.extend_from_slice(b"&quot;"),
52 _ => write_hex_to_vec(e, output),
53 }
54}
55
56#[cfg(feature = "std")]
57#[inline]
58pub(crate) fn write_html_entity_to_writer<W: Write>(
59 e: u8,
60 output: &mut W,
61) -> Result<(), io::Error> {
62 match e {
63 b'&' => output.write_all(buf:b"&amp;"),
64 b'<' => output.write_all(buf:b"&lt;"),
65 b'>' => output.write_all(buf:b"&gt;"),
66 b'"' => output.write_all(buf:b"&quot;"),
67 _ => write_hex_to_writer(e, output),
68 }
69}
70
71#[inline]
72pub(crate) fn write_char_to_vec(c: char, output: &mut Vec<u8>) {
73 let width: usize = c.len_utf8();
74
75 output.reserve(additional:width);
76
77 let current_length: usize = output.len();
78
79 unsafe {
80 output.set_len(new_len:current_length + width);
81 }
82
83 c.encode_utf8(&mut output[current_length..]);
84}
85
86#[cfg(feature = "std")]
87#[inline]
88pub(crate) fn write_char_to_writer<W: Write>(c: char, output: &mut W) -> Result<(), io::Error> {
89 let mut buffer: [u8; 4] = [0u8; 4];
90 let length: usize = c.encode_utf8(&mut buffer).len();
91
92 output.write_all(&buffer[..length])
93}
94