1 files changed, 37 insertions, 0 deletions
diff --git a/third_party/rust/bincode/src/config/trailing.rs b/third_party/rust/bincode/src/config/trailing.rs
new file mode 100644
index 0000000000..6052fc7d78
--- /dev/null
+++ b/third_party/rust/bincode/src/config/trailing.rs
@@ -0,0 +1,37 @@
+use de::read::SliceReader;
+use {ErrorKind, Result};
+
+/// A trait for erroring deserialization if not all bytes were read.
+pub trait TrailingBytes {
+    /// Checks a given slice reader to determine if deserialization used all bytes in the slice.
+    fn check_end(reader: &SliceReader) -> Result<()>;
+}
+
+/// A TrailingBytes config that will allow trailing bytes in slices after deserialization.
+#[derive(Copy, Clone)]
+pub struct AllowTrailing;
+
+/// A TrailingBytes config that will cause bincode to produce an error if bytes are left over in the slice when deserialization is complete.
+
+#[derive(Copy, Clone)]
+pub struct RejectTrailing;
+
+impl TrailingBytes for AllowTrailing {
+    #[inline(always)]
+    fn check_end(_reader: &SliceReader) -> Result<()> {
+        Ok(())
+    }
+}
+
+impl TrailingBytes for RejectTrailing {
+    #[inline(always)]
+    fn check_end(reader: &SliceReader) -> Result<()> {
+        if reader.is_finished() {
+            Ok(())
+        } else {
+            Err(Box::new(ErrorKind::Custom(
+                "Slice had bytes remaining after deserialization".to_string(),
+            )))
+        }
+    }
+}