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|
//! ASN.1 `TeletexString` support.
//!
use crate::{asn1::AnyRef, FixedTag, Result, StrRef, Tag};
use core::{fmt, ops::Deref};
macro_rules! impl_teletex_string {
($type: ty) => {
impl_teletex_string!($type,);
};
($type: ty, $($li: lifetime)?) => {
impl_string_type!($type, $($li),*);
impl<$($li),*> FixedTag for $type {
const TAG: Tag = Tag::TeletexString;
}
impl<$($li),*> fmt::Debug for $type {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "TeletexString({:?})", self.as_str())
}
}
};
}
/// ASN.1 `TeletexString` 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
///
/// The standard defines a complex character set allowed in this type. However, quoting the ASN.1
/// mailing list, "a sizable volume of software in the world treats TeletexString (T61String) as a
/// simple 8-bit string with mostly Windows Latin 1 (superset of iso-8859-1) encoding".
///
#[derive(Copy, Clone, Eq, PartialEq, PartialOrd, Ord)]
pub struct TeletexStringRef<'a> {
/// Inner value
inner: StrRef<'a>,
}
impl<'a> TeletexStringRef<'a> {
/// Create a new ASN.1 `TeletexString`.
pub fn new<T>(input: &'a T) -> Result<Self>
where
T: AsRef<[u8]> + ?Sized,
{
let input = input.as_ref();
// FIXME: support higher part of the charset
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_teletex_string!(TeletexStringRef<'a>, 'a);
impl<'a> Deref for TeletexStringRef<'a> {
type Target = StrRef<'a>;
fn deref(&self) -> &Self::Target {
&self.inner
}
}
impl<'a> From<&TeletexStringRef<'a>> for TeletexStringRef<'a> {
fn from(value: &TeletexStringRef<'a>) -> TeletexStringRef<'a> {
*value
}
}
impl<'a> From<TeletexStringRef<'a>> for AnyRef<'a> {
fn from(teletex_string: TeletexStringRef<'a>) -> AnyRef<'a> {
AnyRef::from_tag_and_value(Tag::TeletexString, teletex_string.inner.into())
}
}
#[cfg(feature = "alloc")]
pub use self::allocation::TeletexString;
#[cfg(feature = "alloc")]
mod allocation {
use super::TeletexStringRef;
use crate::{
asn1::AnyRef,
referenced::{OwnedToRef, RefToOwned},
BytesRef, Error, FixedTag, Result, StrOwned, Tag,
};
use alloc::string::String;
use core::{fmt, ops::Deref};
/// ASN.1 `TeletexString` 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`].
///
/// # Supported characters
///
/// The standard defines a complex character set allowed in this type. However, quoting the ASN.1
/// mailing list, "a sizable volume of software in the world treats TeletexString (T61String) as a
/// simple 8-bit string with mostly Windows Latin 1 (superset of iso-8859-1) encoding".
///
#[derive(Clone, Eq, PartialEq, PartialOrd, Ord)]
pub struct TeletexString {
/// Inner value
inner: StrOwned,
}
impl TeletexString {
/// Create a new ASN.1 `TeletexString`.
pub fn new<T>(input: &T) -> Result<Self>
where
T: AsRef<[u8]> + ?Sized,
{
let input = input.as_ref();
TeletexStringRef::new(input)?;
StrOwned::from_bytes(input)
.map(|inner| Self { inner })
.map_err(|_| Self::TAG.value_error())
}
}
impl_teletex_string!(TeletexString);
impl Deref for TeletexString {
type Target = StrOwned;
fn deref(&self) -> &Self::Target {
&self.inner
}
}
impl<'a> From<TeletexStringRef<'a>> for TeletexString {
fn from(value: TeletexStringRef<'a>) -> TeletexString {
let inner =
StrOwned::from_bytes(value.inner.as_bytes()).expect("Invalid TeletexString");
Self { inner }
}
}
impl<'a> From<&'a TeletexString> for AnyRef<'a> {
fn from(teletex_string: &'a TeletexString) -> AnyRef<'a> {
AnyRef::from_tag_and_value(
Tag::TeletexString,
BytesRef::new(teletex_string.inner.as_bytes()).expect("Invalid TeletexString"),
)
}
}
impl<'a> RefToOwned<'a> for TeletexStringRef<'a> {
type Owned = TeletexString;
fn ref_to_owned(&self) -> Self::Owned {
TeletexString {
inner: self.inner.ref_to_owned(),
}
}
}
impl OwnedToRef for TeletexString {
type Borrowed<'a> = TeletexStringRef<'a>;
fn owned_to_ref(&self) -> Self::Borrowed<'_> {
TeletexStringRef {
inner: self.inner.owned_to_ref(),
}
}
}
impl TryFrom<String> for TeletexString {
type Error = Error;
fn try_from(input: String) -> Result<Self> {
TeletexStringRef::new(&input)?;
StrOwned::new(input)
.map(|inner| Self { inner })
.map_err(|_| Self::TAG.value_error())
}
}
}
#[cfg(test)]
mod tests {
use super::TeletexStringRef;
use crate::Decode;
use crate::SliceWriter;
#[test]
fn parse_bytes() {
let example_bytes = &[
0x14, 0x0b, 0x54, 0x65, 0x73, 0x74, 0x20, 0x55, 0x73, 0x65, 0x72, 0x20, 0x31,
];
let teletex_string = TeletexStringRef::from_der(example_bytes).unwrap();
assert_eq!(teletex_string.as_str(), "Test User 1");
let mut out = [0_u8; 30];
let mut writer = SliceWriter::new(&mut out);
writer.encode(&teletex_string).unwrap();
let encoded = writer.finish().unwrap();
assert_eq!(encoded, example_bytes);
}
}
|
