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use crate::{
asn1::AnyRef, ord::OrdIsValueOrd, ByteSlice, DecodeValue, EncodeValue, Error, FixedTag, Header,
Length, Reader, Result, StrSlice, Tag, Writer,
};
use core::{fmt, str};
#[derive(Copy, Clone, Eq, PartialEq, PartialOrd, Ord)]
pub struct PrintableStringRef<'a> {
inner: StrSlice<'a>,
}
impl<'a> PrintableStringRef<'a> {
pub fn new<T>(input: &'a T) -> Result<Self>
where
T: AsRef<[u8]> + ?Sized,
{
let input = input.as_ref();
for &c in input.iter() {
match c {
b'A'..=b'Z'
| b'a'..=b'z'
| b'0'..=b'9'
| b' '
| b'\''
| b'('
| b')'
| b'+'
| b','
| b'-'
| b'.'
| b'/'
| b':'
| b'='
| b'?' => (),
_ => return Err(Self::TAG.value_error()),
}
}
StrSlice::from_bytes(input)
.map(|inner| Self { inner })
.map_err(|_| Self::TAG.value_error())
}
pub fn as_str(&self) -> &'a str {
self.inner.as_str()
}
pub fn as_bytes(&self) -> &'a [u8] {
self.inner.as_bytes()
}
pub fn len(&self) -> Length {
self.inner.len()
}
pub fn is_empty(&self) -> bool {
self.inner.is_empty()
}
}
impl AsRef<str> for PrintableStringRef<'_> {
fn as_ref(&self) -> &str {
self.as_str()
}
}
impl AsRef<[u8]> for PrintableStringRef<'_> {
fn as_ref(&self) -> &[u8] {
self.as_bytes()
}
}
impl<'a> DecodeValue<'a> for PrintableStringRef<'a> {
fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> Result<Self> {
Self::new(ByteSlice::decode_value(reader, header)?.as_slice())
}
}
impl<'a> EncodeValue for PrintableStringRef<'a> {
fn value_len(&self) -> Result<Length> {
self.inner.value_len()
}
fn encode_value(&self, writer: &mut dyn Writer) -> Result<()> {
self.inner.encode_value(writer)
}
}
impl FixedTag for PrintableStringRef<'_> {
const TAG: Tag = Tag::PrintableString;
}
impl OrdIsValueOrd for PrintableStringRef<'_> {}
impl<'a> From<&PrintableStringRef<'a>> for PrintableStringRef<'a> {
fn from(value: &PrintableStringRef<'a>) -> PrintableStringRef<'a> {
*value
}
}
impl<'a> TryFrom<AnyRef<'a>> for PrintableStringRef<'a> {
type Error = Error;
fn try_from(any: AnyRef<'a>) -> Result<PrintableStringRef<'a>> {
any.decode_into()
}
}
impl<'a> From<PrintableStringRef<'a>> for AnyRef<'a> {
fn from(printable_string: PrintableStringRef<'a>) -> AnyRef<'a> {
AnyRef::from_tag_and_value(Tag::PrintableString, printable_string.inner.into())
}
}
impl<'a> From<PrintableStringRef<'a>> for &'a [u8] {
fn from(printable_string: PrintableStringRef<'a>) -> &'a [u8] {
printable_string.as_bytes()
}
}
impl<'a> fmt::Display for PrintableStringRef<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(self.as_str())
}
}
impl<'a> fmt::Debug for PrintableStringRef<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "PrintableString({:?})", self.as_str())
}
}
#[cfg(test)]
mod tests {
use super::PrintableStringRef;
use crate::Decode;
#[test]
fn parse_bytes() {
let example_bytes = &[
0x13, 0x0b, 0x54, 0x65, 0x73, 0x74, 0x20, 0x55, 0x73, 0x65, 0x72, 0x20, 0x31,
];
let printable_string = PrintableStringRef::from_der(example_bytes).unwrap();
assert_eq!(printable_string.as_str(), "Test User 1");
}
}