Adds initial support to @detectXSS

Libinject was recently updated to support XSS detection. This commit adds
initial support to it.

apache2/libinjection/libinjection_html5.h

@@ -0,0 +1,54 @@
+#ifndef LIBINJECTION_HTML5
+#define LIBINJECTION_HTML5
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* pull in size_t */
+
+#include <strings.h>
+
+enum html5_type {
+    DATA_TEXT
+    , TAG_NAME_OPEN
+    , TAG_NAME_CLOSE
+    , TAG_NAME_SELFCLOSE
+    , TAG_DATA
+    , TAG_CLOSE
+    , ATTR_NAME
+    , ATTR_VALUE
+    , TAG_COMMENT
+    , DOCTYPE
+};
+
+enum html5_flags {
+  DATA_STATE
+  , VALUE_NO_QUOTE
+  , VALUE_SINGLE_QUOTE
+  , VALUE_DOUBLE_QUOTE
+  , VALUE_BACK_QUOTE
+};
+
+struct h5_state;
+typedef int (*ptr_html5_state)(struct h5_state*);
+
+typedef struct h5_state {
+    const char* s;
+    size_t len;
+    size_t pos;
+    int is_close;
+    ptr_html5_state state;
+    const char* token_start;
+    size_t token_len;
+    enum html5_type token_type;
+} h5_state_t;
+
+
+void libinjection_h5_init(h5_state_t* hs, const char* s, size_t len, enum html5_flags);
+int libinjection_h5_next(h5_state_t* hs);
+
+#ifdef __cplusplus
+}
+#endif
+#endif