new file mode 100644
--- /dev/null
+++ b/src/core/ngx_hash.h
@@ -0,0 +1,37 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#ifndef _NGX_HASH_H_INCLUDED_
+#define _NGX_HASH_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+typedef struct {
+    void        **buckets;
+    ngx_uint_t    hash_size;
+
+    ngx_uint_t    max_size;
+    ngx_uint_t    bucket_limit;
+    size_t        bucket_size;
+    char         *name;
+    ngx_uint_t    min_buckets;
+} ngx_hash_t;
+
+
+typedef struct {
+    ngx_uint_t  hash;
+    ngx_str_t   key;
+    ngx_str_t   value;
+} ngx_table_elt_t;
+
+
+ngx_int_t ngx_hash_init(ngx_hash_t *hash, ngx_pool_t *pool, void *names);
+
+
+#endif /* _NGX_HASH_H_INCLUDED_ */