Unit application library.

Library now used in all language modules.
Old 'nxt_app_*' code removed.

See src/test/nxt_unit_app_test.c for usage sample.

src/nxt_unit_field.h

@@ -0,0 +1,34 @@
+
+/*
+ * Copyright (C) NGINX, Inc.
+ */
+
+#ifndef _NXT_UNIT_FIELD_H_INCLUDED_
+#define _NXT_UNIT_FIELD_H_INCLUDED_
+
+
+#include <inttypes.h>
+
+#include "nxt_unit_sptr.h"
+
+enum {
+    NXT_UNIT_HASH_HOST           = 0xE6EB,
+    NXT_UNIT_HASH_CONTENT_LENGTH = 0x1EA0,
+    NXT_UNIT_HASH_CONTENT_TYPE   = 0x5F7D,
+    NXT_UNIT_HASH_COOKIE         = 0x23F2,
+};
+
+
+/* Name and Value field aka HTTP header. */
+struct nxt_unit_field_s {
+    uint16_t              hash;
+    uint8_t               skip;
+    uint8_t               name_length;
+    uint32_t              value_length;
+
+    nxt_unit_sptr_t       name;
+    nxt_unit_sptr_t       value;
+};
+
+
+#endif /* _NXT_UNIT_FIELD_H_INCLUDED_ */