der/asn1/
videotex_string.rs

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1//! ASN.1 `VideotexString` support.
2
3use crate::{asn1::AnyRef, FixedTag, Result, StrRef, Tag};
4use core::{fmt, ops::Deref};
5
6/// ASN.1 `VideotexString` type.
7///
8/// Supports a subset the ASCII character set (described below).
9///
10/// For UTF-8, use [`Utf8StringRef`][`crate::asn1::Utf8StringRef`] instead.
11/// For the full ASCII character set, use
12/// [`Ia5StringRef`][`crate::asn1::Ia5StringRef`].
13///
14/// This is a zero-copy reference type which borrows from the input data.
15///
16/// # Supported characters
17///
18/// For the practical purposes VideotexString is treated as IA5string, disallowing non-ASCII chars.
19///
20#[derive(Copy, Clone, Eq, PartialEq, PartialOrd, Ord)]
21pub struct VideotexStringRef<'a> {
22    /// Inner value
23    inner: StrRef<'a>,
24}
25
26impl<'a> VideotexStringRef<'a> {
27    /// Create a new ASN.1 `VideotexString`.
28    pub fn new<T>(input: &'a T) -> Result<Self>
29    where
30        T: AsRef<[u8]> + ?Sized,
31    {
32        let input = input.as_ref();
33
34        // Validate all characters are within VideotexString's allowed set
35        // FIXME: treat as if it were IA5String
36        if input.iter().any(|&c| c > 0x7F) {
37            return Err(Self::TAG.value_error());
38        }
39
40        StrRef::from_bytes(input)
41            .map(|inner| Self { inner })
42            .map_err(|_| Self::TAG.value_error())
43    }
44}
45
46impl_string_type!(VideotexStringRef<'a>, 'a);
47
48impl<'a> Deref for VideotexStringRef<'a> {
49    type Target = StrRef<'a>;
50
51    fn deref(&self) -> &Self::Target {
52        &self.inner
53    }
54}
55
56impl FixedTag for VideotexStringRef<'_> {
57    const TAG: Tag = Tag::VideotexString;
58}
59
60impl<'a> From<&VideotexStringRef<'a>> for VideotexStringRef<'a> {
61    fn from(value: &VideotexStringRef<'a>) -> VideotexStringRef<'a> {
62        *value
63    }
64}
65
66impl<'a> From<VideotexStringRef<'a>> for AnyRef<'a> {
67    fn from(printable_string: VideotexStringRef<'a>) -> AnyRef<'a> {
68        AnyRef::from_tag_and_value(Tag::VideotexString, printable_string.inner.into())
69    }
70}
71
72impl<'a> From<VideotexStringRef<'a>> for &'a [u8] {
73    fn from(printable_string: VideotexStringRef<'a>) -> &'a [u8] {
74        printable_string.as_bytes()
75    }
76}
77
78impl<'a> fmt::Debug for VideotexStringRef<'a> {
79    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
80        write!(f, "VideotexString({:?})", self.as_str())
81    }
82}
83
84#[cfg(test)]
85mod tests {
86    use super::VideotexStringRef;
87    use crate::Decode;
88
89    #[test]
90    fn parse_bytes() {
91        let example_bytes = &[
92            0x15, 0x0b, 0x54, 0x65, 0x73, 0x74, 0x20, 0x55, 0x73, 0x65, 0x72, 0x20, 0x31,
93        ];
94
95        let printable_string = VideotexStringRef::from_der(example_bytes).unwrap();
96        assert_eq!(printable_string.as_str(), "Test User 1");
97    }
98}
der/asn1/videotex_string.rs

der/asn1/
videotex_string.rs
