Merge pull request #3 from tmthecoder/add-repr-c

Add `#[repr(C)]` as a feature

Author: tmthecoder

Cargo.toml

@@ -10,6 +10,10 @@ authors = ["Tejas Mehta <[email protected]>"]
 version = "0.2.0"
 edition = "2021"
 
+[features]
+default = []
+ffi = []
+
 [dependencies]
 hmac = "0.12.0"
 sha-1 = "0.10.0"

src/hotp.rs

@@ -16,6 +16,7 @@ use crate::util::{base32_decode, get_code, hash_generic, MacDigest};
 /// [RFC4226]: https://datatracker.ietf.org/doc/html/rfc4226
 
 #[derive(Debug, Clone, Hash)]
+#[cfg_attr(feature = "ffi", repr(C))]
 pub struct HOTP {
     /// The secret key used in the HMAC process.
     ///

src/totp.rs

@@ -15,6 +15,7 @@ use crate::util::{base32_decode, get_code, hash_generic, MacDigest};
 ///
 /// [RFC6238]: https://datatracker.ietf.org/doc/html/rfc6238
 #[derive(Debug, Clone, Hash)]
+#[cfg_attr(feature = "ffi", repr(C))]
 pub struct TOTP {
     /// The secret key used in the HMAC process.
     ///

src/util.rs

@@ -19,7 +19,9 @@ use crate::totp::TOTP;
 /// may not support other digest algorithms.
 ///
 /// [RFC6238]: https://datatracker.ietf.org/doc/html/rfc6238
+
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
+#[cfg_attr(feature = "ffi", repr(C))]
 pub enum MacDigest {
     SHA1,
     SHA256,
@@ -77,13 +79,15 @@ pub(crate) fn base32_decode(data: &str) -> Option<Vec<u8>> {
 ///
 /// It's either a TOTP or a HOTP with its current counter.
 #[derive(Debug)]
+#[cfg_attr(feature = "ffi", repr(C))]
 pub enum ParseResult {
     TOTP(TOTP),
     HOTP(HOTP, u64),
 }
 
 /// Different error types of the optauth URI parsing.
 #[derive(Debug)]
+#[cfg_attr(feature = "ffi", repr(C))]
 pub enum ParseError {
     UriParseError(url::ParseError),
     WrongScheme(String),