From db198936be1a80f1735731d9e95eb6f4c48a5329 Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Thu, 17 Jan 2019 02:05:52 +0000
Subject: Add the Error enum and the Result<T> typedef

The Error enum is a wrapper for the possible error types (currently only
CommandError).  Result<T> is defined as Result<T, Error>.
---
 src/error.rs | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

(limited to 'src/error.rs')

diff --git a/src/error.rs b/src/error.rs
index dcaa4d2..89c4c82 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -2,8 +2,41 @@ use std::borrow;
 use std::error;
 use std::fmt;
 use std::os::raw;
+use std::result;
 
-/// Error types returned by Nitrokey device or by the library.
+/// An error returned by the nitrokey crate.
+#[derive(Debug)]
+pub enum Error {
+    /// An error reported by the Nitrokey device in the response packet.
+    CommandError(CommandError),
+}
+
+impl From<CommandError> for Error {
+    fn from(err: CommandError) -> Self {
+        Error::CommandError(err)
+    }
+}
+
+impl error::Error for Error {
+    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+        match *self {
+            Error::CommandError(ref err) => Some(err),
+        }
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            Error::CommandError(ref err) => write!(f, "Command error: {}", err),
+        }
+    }
+}
+
+/// A result returned by the nitrokey crate.
+pub type Result<T> = result::Result<T, Error>;
+
+/// An error reported by the Nitrokey device in the response packet.
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub enum CommandError {
     /// A packet with a wrong checksum has been sent or received.
-- 
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