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use crate::*;
use alloc::borrow::Cow;
use alloc::string::{String, ToString};
use alloc::vec::Vec;
#[derive(Debug, PartialEq)]
pub struct BmpString<'a> {
pub(crate) data: Cow<'a, str>,
}
impl<'a> BmpString<'a> {
pub const fn new(s: &'a str) -> Self {
BmpString {
data: Cow::Borrowed(s),
}
}
pub fn string(&self) -> String {
self.data.to_string()
}
}
impl<'a> AsRef<str> for BmpString<'a> {
fn as_ref(&self) -> &str {
&self.data
}
}
impl<'a> From<&'a str> for BmpString<'a> {
fn from(s: &'a str) -> Self {
Self::new(s)
}
}
impl From<String> for BmpString<'_> {
fn from(s: String) -> Self {
Self {
data: alloc::borrow::Cow::Owned(s),
}
}
}
impl<'a> core::convert::TryFrom<Any<'a>> for BmpString<'a> {
type Error = Error;
fn try_from(any: Any<'a>) -> Result<BmpString<'a>> {
any.tag().assert_eq(Self::TAG)?;
let v = &any
.data
.chunks(2)
.map(|s| match s {
[a, b] => ((*a as u16) << 8) | (*b as u16),
[a] => *a as u16,
_ => unreachable!(),
})
.collect::<Vec<_>>();
let s = String::from_utf16(v)?;
let data = Cow::Owned(s);
Ok(BmpString { data })
}
}
impl<'a> CheckDerConstraints for BmpString<'a> {
fn check_constraints(any: &Any) -> Result<()> {
any.header.assert_primitive()?;
Ok(())
}
}
impl DerAutoDerive for BmpString<'_> {}
impl<'a> Tagged for BmpString<'a> {
const TAG: Tag = Tag::BmpString;
}
impl<'a> TestValidCharset for BmpString<'a> {
fn test_valid_charset(i: &[u8]) -> Result<()> {
if i.len() % 2 != 0 {
return Err(Error::StringInvalidCharset);
}
let iter = i.chunks(2).map(|s| ((s[0] as u16) << 8) | (s[1] as u16));
for c in char::decode_utf16(iter) {
if c.is_err() {
return Err(Error::StringInvalidCharset);
}
}
Ok(())
}
}
#[cfg(feature = "std")]
impl ToDer for BmpString<'_> {
fn to_der_len(&self) -> Result<usize> {
let sz = self.data.encode_utf16().count() * 2;
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 l = self.data.encode_utf16().count() * 2;
let header = Header::new(Class::Universal, false, Self::TAG, Length::Definite(l));
header.write_der_header(writer).map_err(Into::into)
}
fn write_der_content(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
let mut v = Vec::new();
for u in self.data.encode_utf16() {
v.push((u >> 8) as u8);
v.push((u & 0xff) as u8);
}
writer.write(&v).map_err(Into::into)
}
}