--- a/src/http/ngx_http_script.h
+++ b/src/http/ngx_http_script.h
@@ -13,14 +13,54 @@
 #include <ngx_http.h>
 
 
-typedef u_char *(*ngx_http_script_code_pt) (ngx_http_request_t *r,
-                                            u_char *buf, void *data);
+typedef struct {
+    u_char                         *ip;
+    u_char                         *pos;
+    ngx_http_request_t             *request;
+} ngx_http_script_lite_engine_t;
+
+
+typedef struct {
+    ngx_http_script_lite_engine_t   lite;
+} ngx_http_script_engine_t;
+
+
+typedef void (*ngx_http_script_code_pt) (ngx_http_script_engine_t *e);
+typedef size_t (*ngx_http_script_len_code_pt)
+    (ngx_http_script_lite_engine_t *e);
+
+typedef ngx_int_t (*ngx_http_script_compile_lite_start_pt) (ngx_table_elt_t *h,
+    ngx_array_t *lengths, ngx_array_t *values, ngx_uint_t value);
+typedef ngx_int_t (*ngx_http_script_compile_lite_end_pt) (ngx_array_t *lengths,
+    ngx_array_t *values);
+
 
-typedef struct ngx_http_script_code_s {
-    size_t                   data_len;
-    size_t                   code_len;
-    ngx_http_script_code_pt  code;
-} ngx_http_script_code_t;
+typedef struct {
+    ngx_http_script_code_pt         code;
+    uintptr_t                       len;
+} ngx_http_script_copy_code_t;
+
+
+typedef struct {
+    ngx_http_script_code_pt         code;
+    uintptr_t                       index;
+} ngx_http_script_var_code_t;
+
+
+ngx_int_t ngx_http_script_compile_lite(ngx_conf_t *cf, ngx_array_t *sources,
+    ngx_array_t **lengths, ngx_array_t **values,
+    ngx_http_script_compile_lite_start_pt start,
+    ngx_http_script_compile_lite_end_pt end);
+
+
+static void *ngx_http_script_start_code(ngx_pool_t *pool, ngx_array_t **codes,
+    size_t size);
+
+size_t ngx_http_script_copy_len(ngx_http_script_engine_t *e);
+void ngx_http_script_copy(ngx_http_script_engine_t *e);
+size_t ngx_http_script_copy_var_len(ngx_http_script_engine_t *e);
+void ngx_http_script_copy_var(ngx_http_script_engine_t *e);
+
 
 
 #endif /* _NGX_HTTP_SCRIPT_H_INCLUDED_ */