Move converted code to its own submodule

src/confid/mod.rs

@@ -0,0 +1,43 @@
+use std::ffi::{CStr, CString};
+
+use thiserror::Error;
+
+mod black_box;
+
+#[derive(Error, Debug)]
+pub enum ConfirmationIdError {
+    #[error("Installation ID is too short.")]
+    TooShort,
+    #[error("Installation ID is too long.")]
+    TooLarge,
+    #[error("Invalid character in installation ID.")]
+    InvalidCharacter,
+    #[error("Installation ID checksum failed. Please check that it is typed correctly.")]
+    InvalidCheckDigit,
+    #[error("Unknown installation ID version.")]
+    UnknownVersion,
+    #[error("Unable to generate valid confirmation ID.")]
+    Unlucky,
+}
+
+pub fn generate(installation_id: &str) -> Result<String, ConfirmationIdError> {
+    let inst_id = CString::new(installation_id).unwrap();
+    let conf_id = [0u8; 49];
+    let result = unsafe { black_box::Generate(inst_id.as_ptr(), conf_id.as_ptr() as *mut i8) };
+    match result {
+        0 => {}
+        1 => return Err(ConfirmationIdError::TooShort),
+        2 => return Err(ConfirmationIdError::TooLarge),
+        3 => return Err(ConfirmationIdError::InvalidCharacter),
+        4 => return Err(ConfirmationIdError::InvalidCheckDigit),
+        5 => return Err(ConfirmationIdError::UnknownVersion),
+        6 => return Err(ConfirmationIdError::Unlucky),
+        _ => panic!("Unknown error code: {}", result),
+    }
+    unsafe {
+        Ok(CStr::from_ptr(conf_id.as_ptr() as *const i8)
+            .to_str()
+            .unwrap()
+            .to_string())
+    }
+}