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diff --git a/vendor/icu_provider/src/buf.rs b/vendor/icu_provider/src/buf.rs
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+++ b/vendor/icu_provider/src/buf.rs
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+// 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 ).
+
+//! Traits for data providers that produce opaque buffers.
+
+use crate::prelude::*;
+
+/// [`DataMarker`] for raw buffers. Returned by [`BufferProvider`].
+///
+/// The data is expected to be deserialized before it can be used; see
+/// [`DataPayload::into_deserialized`].
+#[allow(clippy::exhaustive_structs)] // marker type
+pub struct BufferMarker;
+
+impl DataMarker for BufferMarker {
+    type Yokeable = &'static [u8];
+}
+
+/// A data provider that returns opaque bytes.
+///
+/// Generally, these bytes are expected to be deserializable with Serde. To get an object
+/// implementing [`DataProvider`] via Serde, use [`as_deserializing()`], which requires
+/// enabling at least one of the Serde features.
+///
+/// Along with [`DataProvider`], this is one of the two foundational traits in this crate.
+///
+/// [`BufferProvider`] can be made into a trait object. It is used over FFI.
+///
+/// # Examples
+///
+/// ```
+/// # #[cfg(feature = "deserialize_json")] {
+/// use icu_locid::locale;
+/// use icu_provider::hello_world::*;
+/// use icu_provider::prelude::*;
+///
+/// let buffer_provider = HelloWorldProvider.into_json_provider();
+///
+/// let data_provider = buffer_provider.as_deserializing();
+///
+/// let german_hello_world: DataPayload<HelloWorldV1Marker> = data_provider
+///     .load(DataRequest {
+///         locale: &locale!("de").into(),
+///         metadata: Default::default(),
+///     })
+///     .expect("Loading should succeed")
+///     .take_payload()
+///     .expect("Data should be present");
+///
+/// assert_eq!("Hallo Welt", german_hello_world.get().message);
+/// # }
+/// ```
+///
+/// [`as_deserializing()`]: AsDeserializingBufferProvider::as_deserializing
+pub trait BufferProvider {
+    /// Loads a [`DataPayload`]`<`[`BufferMarker`]`>` according to the key and request.
+    fn load_buffer(
+        &self,
+        key: DataKey,
+        req: DataRequest,
+    ) -> Result<DataResponse<BufferMarker>, DataError>;
+}
+
+impl<T: BufferProvider + ?Sized> BufferProvider for alloc::boxed::Box<T> {
+    fn load_buffer(
+        &self,
+        key: DataKey,
+        req: DataRequest,
+    ) -> Result<DataResponse<BufferMarker>, DataError> {
+        (**self).load_buffer(key, req)
+    }
+}
+
+/// An enum expressing all Serde formats known to ICU4X.
+#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[non_exhaustive]
+pub enum BufferFormat {
+    /// Serialize using JavaScript Object Notation (JSON).
+    Json,
+    /// Serialize using Bincode version 1.
+    Bincode1,
+    /// Serialize using Postcard version 0.7.
+    Postcard1,
+}
+
+impl BufferFormat {
+    /// Returns an error if the buffer format is not enabled.
+    pub fn check_available(&self) -> Result<(), DataError> {
+        match self {
+            #[cfg(feature = "deserialize_json")]
+            BufferFormat::Json => Ok(()),
+
+            #[cfg(feature = "deserialize_bincode_1")]
+            BufferFormat::Bincode1 => Ok(()),
+
+            #[cfg(feature = "deserialize_postcard_1")]
+            BufferFormat::Postcard1 => Ok(()),
+
+            // Allowed for cases in which all features are enabled
+            #[allow(unreachable_patterns)]
+            _ => Err(DataErrorKind::UnavailableBufferFormat(*self).into_error()),
+        }
+    }
+}