Implement error type for library

Cargo.lock

@@ -405,6 +405,7 @@ dependencies = [
  "binrw",
  "chrono",
  "substring",
+ "thiserror",
  "urlencoding",
 ]
 
@@ -697,6 +698,26 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "611040a08a0439f8248d1990b111c95baa9c704c805fa1f62104b39655fd7f90"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "090198534930841fab3a5d1bb637cde49e339654e606195f8d9c76eeb081dc96"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.27",
+]
+
 [[package]]
 name = "time"
 version = "0.1.45"

crates/save/Cargo.toml

@@ -10,6 +10,7 @@ crate-type = ["cdylib", "rlib"]
 
 
 [dependencies]
+thiserror = "1.0"
 binrw = "0.11"
 chrono = "0.4"
 urlencoding = "2.1"

crates/save/src/lib.rs

@@ -33,6 +33,19 @@ pub const LEVEL_NAMES: [&str; 12] = [
 ];
 
 
+pub type Result<T, E = Error> = std::result::Result<T, E>;
+
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("Failed to deserialize savefile")]
+    DeserializationFailed(binrw::Error),
+
+    #[error("Failed to serialize savefile")]
+    SerializationFailed(binrw::Error),
+}
+
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum RobeColor {
     Red,
@@ -111,19 +124,18 @@ pub struct Savefile {
 }
 
 impl Savefile {
-    pub fn from_reader<R>(mut reader: R) -> binrw::BinResult<Self>
+    pub fn from_reader<R>(mut reader: R) -> Result<Self>
     where
         R: Read + BinReaderExt,
     {
-        // TODO: implement error type
-        Ok(reader.read_le()?)
+        Ok(reader.read_le().map_err(Error::DeserializationFailed)?)
     }
 
-    pub fn write<W>(&self, mut writer: W) -> binrw::BinResult<()>
+    pub fn write<W>(&self, mut writer: W) -> Result<()>
     where
         W: Write + BinWriterExt,
     {
-        writer.write_le(self)?;
+        writer.write_le(self).map_err(Error::SerializationFailed)?;
 
         Ok(())
     }