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//! ASN.1 `VideotexString` support.
use crate::{asn1::AnyRef, FixedTag, Result, StrRef, Tag};
use core::{fmt, ops::Deref};
/// ASN.1 `VideotexString` type.
///
/// Supports a subset the ASCII character set (described below).
///
/// For UTF-8, use [`Utf8StringRef`][`crate::asn1::Utf8StringRef`] instead.
/// For the full ASCII character set, use
/// [`Ia5StringRef`][`crate::asn1::Ia5StringRef`].
///
/// This is a zero-copy reference type which borrows from the input data.
///
/// # Supported characters
///
/// For the practical purposes VideotexString is treated as IA5string, disallowing non-ASCII chars.
///
#[derive(Copy, Clone, Eq, PartialEq, PartialOrd, Ord)]
pub struct VideotexStringRef<'a> {
/// Inner value
inner: StrRef<'a>,
}
impl<'a> VideotexStringRef<'a> {
/// Create a new ASN.1 `VideotexString`.
pub fn new<T>(input: &'a T) -> Result<Self>
where
T: AsRef<[u8]> + ?Sized,
{
let input = input.as_ref();
// Validate all characters are within VideotexString's allowed set
// FIXME: treat as if it were IA5String
if input.iter().any(|&c| c > 0x7F) {
return Err(Self::TAG.value_error());
}
StrRef::from_bytes(input)
.map(|inner| Self { inner })
.map_err(|_| Self::TAG.value_error())
}
}
impl_string_type!(VideotexStringRef<'a>, 'a);
impl<'a> Deref for VideotexStringRef<'a> {
type Target = StrRef<'a>;
fn deref(&self) -> &Self::Target {
&self.inner
}
}
impl FixedTag for VideotexStringRef<'_> {
const TAG: Tag = Tag::VideotexString;
}
impl<'a> From<&VideotexStringRef<'a>> for VideotexStringRef<'a> {
fn from(value: &VideotexStringRef<'a>) -> VideotexStringRef<'a> {
*value
}
}
impl<'a> From<VideotexStringRef<'a>> for AnyRef<'a> {
fn from(printable_string: VideotexStringRef<'a>) -> AnyRef<'a> {
AnyRef::from_tag_and_value(Tag::VideotexString, printable_string.inner.into())
}
}
impl<'a> From<VideotexStringRef<'a>> for &'a [u8] {
fn from(printable_string: VideotexStringRef<'a>) -> &'a [u8] {
printable_string.as_bytes()
}
}
impl<'a> fmt::Debug for VideotexStringRef<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "VideotexString({:?})", self.as_str())
}
}
#[cfg(test)]
mod tests {
use super::VideotexStringRef;
use crate::Decode;
#[test]
fn parse_bytes() {
let example_bytes = &[
0x15, 0x0b, 0x54, 0x65, 0x73, 0x74, 0x20, 0x55, 0x73, 0x65, 0x72, 0x20, 0x31,
];
let printable_string = VideotexStringRef::from_der(example_bytes).unwrap();
assert_eq!(printable_string.as_str(), "Test User 1");
}
}
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