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
|
//! S-Expression support.
//!
//! This implements parsing of [S-Expressions] encoded using the
//! canonical and basic transport encoding.
//!
//! [S-Expressions]: https://people.csail.mit.edu/rivest/Sexp.txt
use std::cmp;
use std::io::{Read, Write};
use std::path::Path;
use buffered_reader::{self, BufferedReader};
use lalrpop_util::{lalrpop_mod, ParseError};
use crate::Error;
use crate::Result;
use crate::crypto::sexp::Sexp;
use crate::parse::Parse;
mod lexer;
use self::lexer::Lexer;
// Load the generated code.
lalrpop_mod!(#[allow(missing_docs, unused_parens)] grammar, "/parse/sexp/grammar.rs");
impl<'a> Parse<'a, Sexp> for Sexp {
fn from_reader<R: 'a + Read>(reader: R) -> Result<Sexp> {
Self::from_bytes(
buffered_reader::Generic::new(reader, None).data_eof()?)
}
fn from_file<P: AsRef<Path>>(path: P) -> Result<Sexp> {
Self::from_bytes(
buffered_reader::File::open(path)?.data_eof()?)
}
fn from_bytes<D: AsRef<[u8]> + ?Sized>(data: &'a D) -> Result<Sexp> {
Self::from_bytes_private(data.as_ref())
}
}
impl Sexp {
fn from_bytes_private(data: &[u8]) -> Result<Sexp> {
match self::grammar::SexprParser::new().parse(Lexer::new(data)) {
Ok(r) => Ok(r),
Err(err) => {
let mut msg = Vec::new();
writeln!(&mut msg, "Parsing: {:?}: {:?}", data, err)?;
if let ParseError::UnrecognizedToken {
token: (start, _, end), ..
} = err
{
writeln!(&mut msg, "Context:")?;
let chars = data.iter().enumerate()
.filter_map(|(i, c)| {
if cmp::max(8, start) - 8 <= i
&& i <= end + 8
{
Some((i, c))
} else {
None
}
});
for (i, c) in chars {
writeln!(&mut msg, "{} {} {}: {:?}",
if i == start { "*" } else { " " },
i,
*c as char,
c)?;
}
}
Err(Error::InvalidArgument(String::from_utf8_lossy(&msg)
.to_string()).into())
},
}
}
}
#[cfg(test)]
mod tests {
use crate::crypto::sexp::{Sexp, String_};
use crate::parse::Parse;
#[test]
fn basics() {
assert_eq!(Sexp::from_bytes(b"()").unwrap(),
Sexp::List(vec![]));
assert_eq!(Sexp::from_bytes(b"2:hi").unwrap(),
Sexp::String(b"hi"[..].into()));
assert_eq!(Sexp::from_bytes(b"[5:fancy]2:hi").unwrap(),
Sexp::String(String_::with_display_hint(
b"hi".to_vec(), b"fancy".to_vec())));
assert_eq!(Sexp::from_bytes(b"(2:hi2:ho)").unwrap(),
Sexp::List(vec![
Sexp::String(b"hi"[..].into()),
Sexp::String(b"ho"[..].into()),
]));
assert_eq!(Sexp::from_bytes(b"(2:hi[5:fancy]2:ho)").unwrap(),
Sexp::List(vec![
Sexp::String(b"hi"[..].into()),
Sexp::String(String_::with_display_hint(
b"ho".to_vec(), b"fancy".to_vec())),
]));
assert_eq!(Sexp::from_bytes(b"(2:hi(2:ha2:ho))").unwrap(),
Sexp::List(vec![
Sexp::String(b"hi"[..].into()),
Sexp::List(vec![
Sexp::String(b"ha"[..].into()),
Sexp::String(b"ho"[..].into()),
]),
]));
assert_eq!(Sexp::from_bytes(b"(7:sig-val(3:rsa(1:s3:abc)))").unwrap(),
Sexp::List(vec![
Sexp::String(b"sig-val"[..].into()),
Sexp::List(vec![
Sexp::String(b"rsa"[..].into()),
Sexp::List(vec![
Sexp::String(b"s"[..].into()),
Sexp::String(b"abc"[..].into()),
]),
]),
]));
assert!(Sexp::from_bytes(b"").is_err());
assert!(Sexp::from_bytes(b"(").is_err());
assert!(Sexp::from_bytes(b"(2:hi").is_err());
assert!(Sexp::from_bytes(b"(2:hi)(2:hi)").is_err());
assert!(Sexp::from_bytes(b"([2:hi])").is_err());
}
#[test]
fn signatures() {
assert!(Sexp::from_bytes(
crate::tests::file("sexp/dsa-signature.sexp")).is_ok());
assert!(Sexp::from_bytes(
crate::tests::file("sexp/ecdsa-signature.sexp")).is_ok());
assert!(Sexp::from_bytes(
crate::tests::file("sexp/eddsa-signature.sexp")).is_ok());
assert!(Sexp::from_bytes(
crate::tests::file("sexp/rsa-signature.sexp")).is_ok());
}
}
|
