1 files changed, 55 insertions, 0 deletions
diff --git a/vendor/zerovec/src/error.rs b/vendor/zerovec/src/error.rs
new file mode 100644
index 000000000..457a0d650
--- /dev/null
+++ b/vendor/zerovec/src/error.rs
@@ -0,0 +1,55 @@
+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+use core::any;
+use core::fmt;
+
+/// A generic error type to be used for decoding slices of ULE types
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[non_exhaustive]
+pub enum ZeroVecError {
+    /// Attempted to parse a buffer into a slice of the given ULE type but its
+    /// length was not compatible
+    InvalidLength { ty: &'static str, len: usize },
+    /// The byte sequence provided for `ty` failed to parse correctly
+    ParseError { ty: &'static str },
+    /// The byte buffer was not in the appropriate format for VarZeroVec
+    VarZeroVecFormatError,
+}
+
+impl fmt::Display for ZeroVecError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
+        match *self {
+            ZeroVecError::InvalidLength { ty, len } => {
+                write!(f, "Invalid length {} for slice of type {}", len, ty)
+            }
+            ZeroVecError::ParseError { ty } => {
+                write!(f, "Could not parse bytes to slice of type {}", ty)
+            }
+            ZeroVecError::VarZeroVecFormatError => {
+                write!(f, "Invalid format for VarZeroVec buffer")
+            }
+        }
+    }
+}
+
+impl ZeroVecError {
+    /// Construct a parse error for the given type
+    pub fn parse<T: ?Sized + 'static>() -> ZeroVecError {
+        ZeroVecError::ParseError {
+            ty: any::type_name::<T>(),
+        }
+    }
+
+    /// Construct an "invalid length" error for the given type and length
+    pub fn length<T: ?Sized + 'static>(len: usize) -> ZeroVecError {
+        ZeroVecError::InvalidLength {
+            ty: any::type_name::<T>(),
+            len,
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl ::std::error::Error for ZeroVecError {}