io: Impl Truncate/Length for refs

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- **Truncate**: `impl<T: Truncate> Truncate for &mut T` ([PR](https://github.com/Serial-ATA/lofty-rs/pull/384))
+- **Length**: `impl<T: Length> Truncate for &T` ([PR](https://github.com/Serial-ATA/lofty-rs/pull/384))
+
 ## [0.19.0] - 2024-04-21
 
 ### Added

lofty/src/util/io.rs

@@ -89,6 +89,17 @@ where
 	}
 }
 
+impl<T> Truncate for &mut T
+where
+	T: Truncate,
+{
+	type Error = <T as Truncate>::Error;
+
+	fn truncate(&mut self, new_len: u64) -> Result<(), Self::Error> {
+		(**self).truncate(new_len)
+	}
+}
+
 /// Provides a method to get the length of a storage object
 ///
 /// This is one component of the [`FileLike`] trait, which is used to provide implementors access to any
@@ -154,6 +165,17 @@ where
 	}
 }
 
+impl<T> Length for &T
+where
+	T: Length,
+{
+	type Error = <T as Length>::Error;
+
+	fn len(&self) -> Result<u64, Self::Error> {
+		Length::len(*self)
+	}
+}
+
 /// Provides a set of methods to read and write to a file-like object
 ///
 /// This is a combination of the [`Read`], [`Write`], [`Seek`], [`Truncate`], and [`Length`] traits.