anyxml_encoding/
us_ascii.rs

1use crate::{DecodeError, Decoder, EncodeError, Encoder};
2
3/// Encoding name for US-ASCII.
4pub const US_ASCII_NAME: &str = "US-ASCII";
5
6/// Encoder for US-ASCII.
7pub struct USASCIIEncoder;
8impl Encoder for USASCIIEncoder {
9    fn name(&self) -> &'static str {
10        US_ASCII_NAME
11    }
12
13    fn encode(
14        &mut self,
15        src: &str,
16        dst: &mut [u8],
17        finish: bool,
18    ) -> Result<(usize, usize), EncodeError> {
19        if src.is_empty() {
20            return if finish {
21                Ok((0, 0))
22            } else {
23                Err(EncodeError::InputIsEmpty)
24            };
25        }
26
27        if dst.is_empty() {
28            return Err(EncodeError::OutputTooShort);
29        }
30
31        let (mut read, mut write) = (0, 0);
32        for c in src.chars() {
33            let b = c as u32;
34            read += c.len_utf8();
35            if b >= 128 {
36                return Err(EncodeError::Unmappable { read, write, c });
37            }
38            dst[write] = b as u8;
39            write += 1;
40            if write == dst.len() {
41                break;
42            }
43        }
44        Ok((read, write))
45    }
46}
47
48/// Decoder for US-ASCII.
49pub struct USASCIIDecoder;
50impl Decoder for USASCIIDecoder {
51    fn name(&self) -> &'static str {
52        US_ASCII_NAME
53    }
54
55    fn decode(
56        &mut self,
57        src: &[u8],
58        dst: &mut String,
59        finish: bool,
60    ) -> Result<(usize, usize), DecodeError> {
61        if src.is_empty() {
62            return if finish {
63                Ok((0, 0))
64            } else {
65                Err(DecodeError::InputIsEmpty)
66            };
67        }
68        let len = dst.capacity() - dst.len();
69        if len == 0 {
70            return Err(DecodeError::OutputTooShort);
71        }
72
73        let (mut read, mut write) = (0, 0);
74        for &b in src {
75            read += 1;
76            if b >= 128 {
77                return Err(DecodeError::Malformed {
78                    read,
79                    write,
80                    length: 1,
81                    offset: 0,
82                });
83            }
84            let c = b as char;
85            dst.push(c);
86            write += 1;
87            if write == len {
88                break;
89            }
90        }
91        Ok((read, write))
92    }
93}
anyxml_encoding/us_ascii.rs

anyxml_encoding/
us_ascii.rs
