Merging upstream version 1.70.0+dfsg2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 55 insertions, 0 deletions

diff --git a/vendor/gix-pack/src/cache/mod.rs b/vendor/gix-pack/src/cache/mod.rs
new file mode 100644
index 000000000..cf4b94df8
--- /dev/null
+++ b/vendor/gix-pack/src/cache/mod.rs
@@ -0,0 +1,55 @@
+use std::ops::DerefMut;
+
+use gix_object::Kind;
+
+/// A trait to model putting objects at a given pack `offset` into a cache, and fetching them.
+///
+/// It is used to speed up [pack traversals][crate::index::File::traverse()].
+pub trait DecodeEntry {
+    /// Store a fully decoded object at `offset` of `kind` with `compressed_size` and `data` in the cache.
+    ///
+    /// It is up to the cache implementation whether that actually happens or not.
+    fn put(&mut self, pack_id: u32, offset: u64, data: &[u8], kind: gix_object::Kind, compressed_size: usize);
+    /// Attempt to fetch the object at `offset` and store its decoded bytes in `out`, as previously stored with [`DecodeEntry::put()`], and return
+    /// its (object `kind`, `decompressed_size`)
+    fn get(&mut self, pack_id: u32, offset: u64, out: &mut Vec<u8>) -> Option<(gix_object::Kind, usize)>;
+}
+
+/// A cache that stores nothing and retrieves nothing, thus it _never_ caches.
+#[derive(Default)]
+pub struct Never;
+
+impl DecodeEntry for Never {
+    fn put(&mut self, _pack_id: u32, _offset: u64, _data: &[u8], _kind: gix_object::Kind, _compressed_size: usize) {}
+    fn get(&mut self, _pack_id: u32, _offset: u64, _out: &mut Vec<u8>) -> Option<(gix_object::Kind, usize)> {
+        None
+    }
+}
+
+impl<T: DecodeEntry + ?Sized> DecodeEntry for Box<T> {
+    fn put(&mut self, pack_id: u32, offset: u64, data: &[u8], kind: Kind, compressed_size: usize) {
+        self.deref_mut().put(pack_id, offset, data, kind, compressed_size)
+    }
+
+    fn get(&mut self, pack_id: u32, offset: u64, out: &mut Vec<u8>) -> Option<(Kind, usize)> {
+        self.deref_mut().get(pack_id, offset, out)
+    }
+}
+
+/// A way of storing and retrieving entire objects to and from a cache.
+pub trait Object {
+    /// Put the object going by `id` of `kind` with `data` into the cache.
+    fn put(&mut self, id: gix_hash::ObjectId, kind: gix_object::Kind, data: &[u8]);
+
+    /// Try to retrieve the object named `id` and place its data into `out` if available and return `Some(kind)` if found.
+    fn get(&mut self, id: &gix_hash::ObjectId, out: &mut Vec<u8>) -> Option<gix_object::Kind>;
+}
+
+/// Various implementations of [`DecodeEntry`] using least-recently-used algorithms.
+#[cfg(any(feature = "pack-cache-lru-dynamic", feature = "pack-cache-lru-static"))]
+pub mod lru;
+
+pub mod object;
+
+///
+pub(crate) mod delta;