refactor: consolidate platform engines into senbei-engine

senbei-engine/src/android/restore/error.rs

@@ -0,0 +1,35 @@
+use std::path::{Path, PathBuf};
+
+/// ELF restoration failure.
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("{action} `{path}`: {source}")]
+    Io {
+        action: &'static str,
+        path: PathBuf,
+        #[source]
+        source: std::io::Error,
+    },
+    #[error("cannot parse module index: {0}")]
+    Json(#[from] serde_json::Error),
+    #[error(transparent)]
+    Crypto(#[from] senbei_crypto::android::Error),
+    #[error("{0}")]
+    Invalid(String),
+}
+
+impl Error {
+    pub(crate) fn io(action: &'static str, path: &Path, source: std::io::Error) -> Self {
+        Self::Io {
+            action,
+            path: path.to_path_buf(),
+            source,
+        }
+    }
+}
+
+pub(crate) type Result<T> = std::result::Result<T, Error>;
+
+pub(crate) fn invalid<T>(message: impl Into<String>) -> Result<T> {
+    Err(Error::Invalid(message.into()))
+}