1 files changed, 143 insertions, 0 deletions
diff --git a/src/asn1/videotex_string.rs b/src/asn1/videotex_string.rs
new file mode 100644
index 0000000..b758a22
--- /dev/null
+++ b/src/asn1/videotex_string.rs
@@ -0,0 +1,143 @@
+//! ASN.1 `VideotexString` support.
+
+use crate::{
+    asn1::AnyRef, ord::OrdIsValueOrd, ByteSlice, DecodeValue, EncodeValue, Error, FixedTag, Header,
+    Length, Reader, Result, StrSlice, Tag, Writer,
+};
+use core::{fmt, ops::Deref, str};
+
+/// 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: StrSlice<'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());
+        }
+
+        StrSlice::from_bytes(input)
+            .map(|inner| Self { inner })
+            .map_err(|_| Self::TAG.value_error())
+    }
+}
+
+impl<'a> Deref for VideotexStringRef<'a> {
+    type Target = StrSlice<'a>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.inner
+    }
+}
+
+impl AsRef<str> for VideotexStringRef<'_> {
+    fn as_ref(&self) -> &str {
+        self.as_str()
+    }
+}
+
+impl AsRef<[u8]> for VideotexStringRef<'_> {
+    fn as_ref(&self) -> &[u8] {
+        self.as_bytes()
+    }
+}
+
+impl<'a> DecodeValue<'a> for VideotexStringRef<'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 VideotexStringRef<'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 VideotexStringRef<'_> {
+    const TAG: Tag = Tag::VideotexString;
+}
+
+impl OrdIsValueOrd for VideotexStringRef<'_> {}
+
+impl<'a> From<&VideotexStringRef<'a>> for VideotexStringRef<'a> {
+    fn from(value: &VideotexStringRef<'a>) -> VideotexStringRef<'a> {
+        *value
+    }
+}
+
+impl<'a> TryFrom<AnyRef<'a>> for VideotexStringRef<'a> {
+    type Error = Error;
+
+    fn try_from(any: AnyRef<'a>) -> Result<VideotexStringRef<'a>> {
+        any.decode_into()
+    }
+}
+
+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::Display for VideotexStringRef<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(self.as_str())
+    }
+}
+
+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");
+    }
+}