1 files changed, 101 insertions, 0 deletions
diff --git a/src/libgit2/offmap.c b/src/libgit2/offmap.c
new file mode 100644
index 000000000..be9eb66d8
--- /dev/null
+++ b/src/libgit2/offmap.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "offmap.h"
+
+#define kmalloc git__malloc
+#define kcalloc git__calloc
+#define krealloc git__realloc
+#define kreallocarray git__reallocarray
+#define kfree git__free
+#include "khash.h"
+
+__KHASH_TYPE(off, off64_t, void *)
+
+__KHASH_IMPL(off, static kh_inline, off64_t, void *, 1, kh_int64_hash_func, kh_int64_hash_equal)
+
+
+int git_offmap_new(git_offmap **out)
+{
+	*out = kh_init(off);
+	GIT_ERROR_CHECK_ALLOC(*out);
+
+	return 0;
+}
+
+void git_offmap_free(git_offmap *map)
+{
+	kh_destroy(off, map);
+}
+
+void git_offmap_clear(git_offmap *map)
+{
+	kh_clear(off, map);
+}
+
+size_t git_offmap_size(git_offmap *map)
+{
+	return kh_size(map);
+}
+
+void *git_offmap_get(git_offmap *map, const off64_t key)
+{
+	size_t idx = kh_get(off, map, key);
+	if (idx == kh_end(map) || !kh_exist(map, idx))
+		return NULL;
+	return kh_val(map, idx);
+}
+
+int git_offmap_set(git_offmap *map, const off64_t key, void *value)
+{
+	size_t idx;
+	int rval;
+
+	idx = kh_put(off, map, key, &rval);
+	if (rval < 0)
+		return -1;
+
+	if (rval == 0)
+		kh_key(map, idx) = key;
+
+	kh_val(map, idx) = value;
+
+	return 0;
+}
+
+int git_offmap_delete(git_offmap *map, const off64_t key)
+{
+	khiter_t idx = kh_get(off, map, key);
+	if (idx == kh_end(map))
+		return GIT_ENOTFOUND;
+	kh_del(off, map, idx);
+	return 0;
+}
+
+int git_offmap_exists(git_offmap *map, const off64_t key)
+{
+	return kh_get(off, map, key) != kh_end(map);
+}
+
+int git_offmap_iterate(void **value, git_offmap *map, size_t *iter, off64_t *key)
+{
+	size_t i = *iter;
+
+	while (i < map->n_buckets && !kh_exist(map, i))
+		i++;
+
+	if (i >= map->n_buckets)
+		return GIT_ITEROVER;
+
+	if (key)
+		*key = kh_key(map, i);
+	if (value)
+		*value = kh_value(map, i);
+	*iter = ++i;
+
+	return 0;
+}