der/asn1/
videotex_string.rs

1//! ASN.1 `VideotexString` support.
2
3use crate::{
4    asn1::AnyRef, ord::OrdIsValueOrd, ByteSlice, DecodeValue, EncodeValue, Error, FixedTag, Header,
5    Length, Reader, Result, StrSlice, Tag, Writer,
6};
7use core::{fmt, ops::Deref, str};
8
9/// ASN.1 `VideotexString` type.
10///
11/// Supports a subset the ASCII character set (described below).
12///
13/// For UTF-8, use [`Utf8StringRef`][`crate::asn1::Utf8StringRef`] instead.
14/// For the full ASCII character set, use
15/// [`Ia5StringRef`][`crate::asn1::Ia5StringRef`].
16///
17/// This is a zero-copy reference type which borrows from the input data.
18///
19/// # Supported characters
20///
21/// For the practical purposes VideotexString is treated as IA5string, disallowing non-ASCII chars.
22///
23#[derive(Copy, Clone, Eq, PartialEq, PartialOrd, Ord)]
24pub struct VideotexStringRef<'a> {
25    /// Inner value
26    inner: StrSlice<'a>,
27}
28
29impl<'a> VideotexStringRef<'a> {
30    /// Create a new ASN.1 `VideotexString`.
31    pub fn new<T>(input: &'a T) -> Result<Self>
32    where
33        T: AsRef<[u8]> + ?Sized,
34    {
35        let input = input.as_ref();
36
37        // Validate all characters are within VideotexString's allowed set
38        // FIXME: treat as if it were IA5String
39        if input.iter().any(|&c| c > 0x7F) {
40            return Err(Self::TAG.value_error());
41        }
42
43        StrSlice::from_bytes(input)
44            .map(|inner| Self { inner })
45            .map_err(|_| Self::TAG.value_error())
46    }
47}
48
49impl<'a> Deref for VideotexStringRef<'a> {
50    type Target = StrSlice<'a>;
51
52    fn deref(&self) -> &Self::Target {
53        &self.inner
54    }
55}
56
57impl AsRef<str> for VideotexStringRef<'_> {
58    fn as_ref(&self) -> &str {
59        self.as_str()
60    }
61}
62
63impl AsRef<[u8]> for VideotexStringRef<'_> {
64    fn as_ref(&self) -> &[u8] {
65        self.as_bytes()
66    }
67}
68
69impl<'a> DecodeValue<'a> for VideotexStringRef<'a> {
70    fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> Result<Self> {
71        Self::new(ByteSlice::decode_value(reader, header)?.as_slice())
72    }
73}
74
75impl<'a> EncodeValue for VideotexStringRef<'a> {
76    fn value_len(&self) -> Result<Length> {
77        self.inner.value_len()
78    }
79
80    fn encode_value(&self, writer: &mut dyn Writer) -> Result<()> {
81        self.inner.encode_value(writer)
82    }
83}
84
85impl FixedTag for VideotexStringRef<'_> {
86    const TAG: Tag = Tag::VideotexString;
87}
88
89impl OrdIsValueOrd for VideotexStringRef<'_> {}
90
91impl<'a> From<&VideotexStringRef<'a>> for VideotexStringRef<'a> {
92    fn from(value: &VideotexStringRef<'a>) -> VideotexStringRef<'a> {
93        *value
94    }
95}
96
97impl<'a> TryFrom<AnyRef<'a>> for VideotexStringRef<'a> {
98    type Error = Error;
99
100    fn try_from(any: AnyRef<'a>) -> Result<VideotexStringRef<'a>> {
101        any.decode_into()
102    }
103}
104
105impl<'a> From<VideotexStringRef<'a>> for AnyRef<'a> {
106    fn from(printable_string: VideotexStringRef<'a>) -> AnyRef<'a> {
107        AnyRef::from_tag_and_value(Tag::VideotexString, printable_string.inner.into())
108    }
109}
110
111impl<'a> From<VideotexStringRef<'a>> for &'a [u8] {
112    fn from(printable_string: VideotexStringRef<'a>) -> &'a [u8] {
113        printable_string.as_bytes()
114    }
115}
116
117impl<'a> fmt::Display for VideotexStringRef<'a> {
118    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
119        f.write_str(self.as_str())
120    }
121}
122
123impl<'a> fmt::Debug for VideotexStringRef<'a> {
124    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
125        write!(f, "VideotexString({:?})", self.as_str())
126    }
127}
128
129#[cfg(test)]
130mod tests {
131    use super::VideotexStringRef;
132    use crate::Decode;
133
134    #[test]
135    fn parse_bytes() {
136        let example_bytes = &[
137            0x15, 0x0b, 0x54, 0x65, 0x73, 0x74, 0x20, 0x55, 0x73, 0x65, 0x72, 0x20, 0x31,
138        ];
139
140        let printable_string = VideotexStringRef::from_der(example_bytes).unwrap();
141        assert_eq!(printable_string.as_str(), "Test User 1");
142    }
143}
der/asn1/videotex_string.rs

der/asn1/
videotex_string.rs
