Finish XMLArgs processing in v3

src/request_body_processor/xml.h

@@ -16,6 +16,7 @@
 #ifdef WITH_LIBXML2
 #include <libxml/xmlschemas.h>
 #include <libxml/xpath.h>
+#include <libxml/SAX.h>
 #endif
 
 #include <string>
@@ -33,12 +34,50 @@ namespace RequestBodyProcessor {
 
 #ifdef WITH_LIBXML2
 
+/*
+* NodeData for parsing XML into args
+*/
+class NodeData {
+    public:
+        explicit NodeData();
+        ~NodeData();
+
+        bool has_child;
+};
+
+/*
+* XMLNodes for parsing XML into args
+*/
+class XMLNodes {
+    public:
+        std::vector<std::shared_ptr<NodeData>> nodes;
+        unsigned long int node_depth;
+        std::string       currpath;
+        std::string       currval;
+        Transaction      *m_transaction;
+        // need to store context - this is the same as at the xml_data
+        // need to stop parsing if the number of arguments reached the limit
+        xmlParserCtxtPtr  parsing_ctx_arg;
+
+        explicit XMLNodes (Transaction *);
+        ~XMLNodes();
+};
+
 struct xml_data {
-    xmlSAXHandler *sax_handler;
+    std::unique_ptr<xmlSAXHandler> sax_handler;
     xmlParserCtxtPtr parsing_ctx;
     xmlDocPtr doc;
 
     unsigned int well_formed;
+
+    /* error reporting and XML array flag */
+    std::string               xml_error;
+
+    /* another parser context for arguments */
+    xmlParserCtxtPtr          parsing_ctx_arg;
+
+    /* parser state for SAX parser */
+    std::unique_ptr<XMLNodes> xml_parser_state;
 };
 
 typedef struct xml_data xml_data;