✨ feat(integration decoders): http and glimpse_detector

compile pass, todo test

decoders/http/http_decoder_string.h

@@ -0,0 +1,74 @@
+#ifndef _HTTP_DECODER_STRING_H_
+#define _HTTP_DECODER_STRING_H_
+
+#include "stellar/http.h"
+
+enum string_state {
+    STRING_STATE_INIT,
+    STRING_STATE_REFER,
+    STRING_STATE_CACHE,
+    STRING_STATE_COMMIT,
+};
+
+/* state transition diagram
+ *       +----------+
+ *       |          |
+ *      \|/         |
+ *    +------+      |
+ *    | init |      |
+ *    +------+      |
+ *       |          |
+ * +---->|          |
+ * |    \|/         |
+ * |  +-------+     |
+ * |  | refer |--+  |
+ * |  +-------+  |  |
+ * |     |       |  |
+ * |    \|/      |  |
+ * |  +-------+  |  |
+ * +--| cache |  |  |
+ *    +-------+  |  |
+ *       |       |  |
+ *       |<------+  |
+ *      \|/         |
+ *    +--------+    |
+ *    | commit |    |
+ *    +--------+    |
+ *       |          |
+ *      \|/         |
+ *    +--------+    |
+ *    | reset  |----+
+ *    +--------+
+ */
+
+
+//http decoder string
+struct http_decoder_string {
+    hstring refer; // shallow copy
+    hstring cache; // deep copy
+    hstring commit;
+
+    enum string_state state;
+    size_t max_cache_size;
+};
+
+void http_decoder_string_refer(struct http_decoder_string *rstr,
+                               const char *at, size_t length);
+
+void http_decoder_string_cache(struct http_decoder_string *rstr);
+
+void http_decoder_string_commit(struct http_decoder_string *rstr);
+
+void http_decoder_string_reset(struct http_decoder_string *rstr);
+
+void http_decoder_string_init(struct http_decoder_string *rstr,
+                              size_t max_cache_size);
+
+void http_decoder_string_reinit(struct http_decoder_string *rstr);
+
+enum string_state http_decoder_string_state(const struct http_decoder_string *rstr);
+
+int http_decoder_string_get(const struct http_decoder_string *rstr, hstring *out);
+
+void http_decoder_string_dump(struct http_decoder_string *rstr, const char *desc);
+#endif