Unescape XML before sending messages over IRC

src/xmpp/xmpp_stanza.cpp

@@ -4,6 +4,8 @@
 
 #include <iostream>
 
+#include <string.h>
+
 std::string xml_escape(const std::string& data)
 {
   std::string res;
@@ -35,6 +37,49 @@ std::string xml_escape(const std::string& data)
   return res;
 }
 
+std::string xml_unescape(const std::string& data)
+{
+  std::string res;
+  res.reserve(data.size());
+  const char* str = data.c_str();
+  while (str && *str && (str - data.c_str()) < data.size())
+    {
+      if (*str == '&')
+        {
+          if (strncmp(str+1, "amp;", 4) == 0)
+            {
+              res += "&";
+              str += 4;
+            }
+          else if (strncmp(str+1, "lt;", 3) == 0)
+            {
+              res += "<";
+              str += 3;
+            }
+          else if (strncmp(str+1, "gt;", 3) == 0)
+            {
+              res += ">";
+              str += 3;
+            }
+          else if (strncmp(str+1, "quot;", 5) == 0)
+            {
+              res += "\"";
+              str += 5;
+            }
+          else if (strncmp(str+1, "apos;", 5) == 0)
+            {
+              res += "'";
+              str += 5;
+            }
+          else
+            res += "&";
+        }
+      else
+        res += *str;
+      str++;
+    }
+  return res;
+}
 
 XmlNode::XmlNode(const std::string& name, XmlNode* parent):
   name(name),
@@ -89,12 +134,12 @@ void XmlNode::add_to_inner(const std::string& data)
 
 std::string XmlNode::get_inner() const
 {
-  return this->inner;
+  return xml_unescape(this->inner);
 }
 
 std::string XmlNode::get_tail() const
 {
-  return this->tail;
+  return xml_unescape(this->tail);
 }
 
 XmlNode* XmlNode::get_child(const std::string& name) const