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use crate::*;
use alloc::borrow::Cow;
use alloc::string::{String, ToString};
use alloc::vec::Vec;
use core::convert::TryFrom;
use core::iter::FromIterator;
#[derive(Debug, PartialEq)]
pub struct UniversalString<'a> {
pub(crate) data: Cow<'a, str>,
}
impl<'a> UniversalString<'a> {
pub const fn new(s: &'a str) -> Self {
UniversalString {
data: Cow::Borrowed(s),
}
}
pub fn string(&self) -> String {
self.data.to_string()
}
}
impl<'a> AsRef<str> for UniversalString<'a> {
fn as_ref(&self) -> &str {
&self.data
}
}
impl<'a> From<&'a str> for UniversalString<'a> {
fn from(s: &'a str) -> Self {
Self::new(s)
}
}
impl From<String> for UniversalString<'_> {
fn from(s: String) -> Self {
Self {
data: alloc::borrow::Cow::Owned(s),
}
}
}
impl<'a> TryFrom<Any<'a>> for UniversalString<'a> {
type Error = Error;
fn try_from(any: Any<'a>) -> Result<UniversalString<'a>> {
TryFrom::try_from(&any)
}
}
impl<'a, 'b> TryFrom<&'b Any<'a>> for UniversalString<'a> {
type Error = Error;
fn try_from(any: &'b Any<'a>) -> Result<UniversalString<'a>> {
any.tag().assert_eq(Self::TAG)?;
if any.data.len() % 4 != 0 {
return Err(Error::StringInvalidCharset);
}
let v = &any
.data
.chunks(4)
.map(|s| match s {
[a, b, c, d] => {
let u32_val = ((*a as u32) << 24)
| ((*b as u32) << 16)
| ((*c as u32) << 8)
| (*d as u32);
char::from_u32(u32_val)
}
_ => unreachable!(),
})
.collect::<Option<Vec<_>>>()
.ok_or(Error::StringInvalidCharset)?;
let s = String::from_iter(v);
let data = Cow::Owned(s);
Ok(UniversalString { data })
}
}
impl<'a> CheckDerConstraints for UniversalString<'a> {
fn check_constraints(any: &Any) -> Result<()> {
any.header.assert_primitive()?;
Ok(())
}
}
impl DerAutoDerive for UniversalString<'_> {}
impl<'a> Tagged for UniversalString<'a> {
const TAG: Tag = Tag::UniversalString;
}
#[cfg(feature = "std")]
impl ToDer for UniversalString<'_> {
fn to_der_len(&self) -> Result<usize> {
let sz = self.data.as_bytes().len() * 4;
if sz < 127 {
Ok(2 + sz)
} else {
let n = Length::Definite(sz).to_der_len()?;
Ok(1 + n + sz)
}
}
fn write_der_header(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
let header = Header::new(
Class::Universal,
false,
Self::TAG,
Length::Definite(self.data.as_bytes().len() * 4),
);
header.write_der_header(writer).map_err(Into::into)
}
fn write_der_content(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
self.data
.chars()
.try_for_each(|c| writer.write(&(c as u32).to_be_bytes()[..]).map(|_| ()))?;
Ok(self.data.as_bytes().len() * 4)
}
}