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-rw-r--r--oidmap.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/oidmap.c b/oidmap.c
new file mode 100644
index 0000000000..6db4fffcdb
--- /dev/null
+++ b/oidmap.c
@@ -0,0 +1,51 @@
+#include "cache.h"
+#include "oidmap.h"
+
+static int cmpfn(const void *hashmap_cmp_fn_data,
+ const void *entry, const void *entry_or_key,
+ const void *keydata)
+{
+ const struct oidmap_entry *entry_ = entry;
+ if (keydata)
+ return oidcmp(&entry_->oid, (const struct object_id *) keydata);
+ return oidcmp(&entry_->oid,
+ &((const struct oidmap_entry *) entry_or_key)->oid);
+}
+
+static int hash(const struct object_id *oid)
+{
+ int hash;
+ memcpy(&hash, oid->hash, sizeof(hash));
+ return hash;
+}
+
+void oidmap_init(struct oidmap *map, size_t initial_size)
+{
+ hashmap_init(&map->map, cmpfn, NULL, initial_size);
+}
+
+void oidmap_free(struct oidmap *map, int free_entries)
+{
+ if (!map)
+ return;
+ hashmap_free(&map->map, free_entries);
+}
+
+void *oidmap_get(const struct oidmap *map, const struct object_id *key)
+{
+ return hashmap_get_from_hash(&map->map, hash(key), key);
+}
+
+void *oidmap_remove(struct oidmap *map, const struct object_id *key)
+{
+ struct hashmap_entry entry;
+ hashmap_entry_init(&entry, hash(key));
+ return hashmap_remove(&map->map, &entry, key);
+}
+
+void *oidmap_put(struct oidmap *map, void *entry)
+{
+ struct oidmap_entry *to_put = entry;
+ hashmap_entry_init(&to_put->internal_entry, hash(&to_put->oid));
+ return hashmap_put(&map->map, to_put);
+}