1 files changed, 61 insertions, 0 deletions
diff --git a/third_party/git/oidmap.c b/third_party/git/oidmap.c
new file mode 100644
index 000000000000..423aa014a33e
--- /dev/null
+++ b/third_party/git/oidmap.c
@@ -0,0 +1,61 @@
+#include "cache.h"
+#include "oidmap.h"
+
+static int oidmap_neq(const void *hashmap_cmp_fn_data,
+		      const struct hashmap_entry *e1,
+		      const struct hashmap_entry *e2,
+		      const void *keydata)
+{
+	const struct oidmap_entry *a, *b;
+
+	a = container_of(e1, const struct oidmap_entry, internal_entry);
+	b = container_of(e2, const struct oidmap_entry, internal_entry);
+
+	if (keydata)
+		return !oideq(&a->oid, (const struct object_id *) keydata);
+	return !oideq(&a->oid, &b->oid);
+}
+
+void oidmap_init(struct oidmap *map, size_t initial_size)
+{
+	hashmap_init(&map->map, oidmap_neq, NULL, initial_size);
+}
+
+void oidmap_free(struct oidmap *map, int free_entries)
+{
+	if (!map)
+		return;
+
+	/* TODO: make oidmap itself not depend on struct layouts */
+	hashmap_free_(&map->map, free_entries ? 0 : -1);
+}
+
+void *oidmap_get(const struct oidmap *map, const struct object_id *key)
+{
+	if (!map->map.cmpfn)
+		return NULL;
+
+	return hashmap_get_from_hash(&map->map, oidhash(key), key);
+}
+
+void *oidmap_remove(struct oidmap *map, const struct object_id *key)
+{
+	struct hashmap_entry entry;
+
+	if (!map->map.cmpfn)
+		oidmap_init(map, 0);
+
+	hashmap_entry_init(&entry, oidhash(key));
+	return hashmap_remove(&map->map, &entry, key);
+}
+
+void *oidmap_put(struct oidmap *map, void *entry)
+{
+	struct oidmap_entry *to_put = entry;
+
+	if (!map->map.cmpfn)
+		oidmap_init(map, 0);
+
+	hashmap_entry_init(&to_put->internal_entry, oidhash(&to_put->oid));
+	return hashmap_put(&map->map, &to_put->internal_entry);
+}