Restored support for setting monster ID offset on monsters tag

Apparently this was supported before, but support for that was lost in
bd1fdd87eed48ba3ffcc413936d6a6a60a429a97.

Fixes #46

5 files changed, 28 insertions, 4 deletions

diff --git a/src/resources/monsterdb.cpp b/src/resources/monsterdb.cpp
index 5fd74c24..c4abeecf 100644
--- a/src/resources/monsterdb.cpp
+++ b/src/resources/monsterdb.cpp
@@ -53,11 +53,15 @@ void MonsterDB::init()
     if (mLoaded)
         unload();
 
-    // This used to be read from offset attribute of monsters root tag, however
-    // I couldn't find any place it was used, so for now the default values are set
+    // This can be overridden by an 'offset' attribute on a 'monsters' root tag.
     mMonsterIdOffset = Net::getNetworkType() == ServerInfo::TMWATHENA ? OLD_TMWATHENA_OFFSET : 0;
 }
 
+void MonsterDB::setMonsterIdOffset(int offset)
+{
+    mMonsterIdOffset = offset;
+}
+
 /**
  * Read <monster> node from settings.
  */
diff --git a/src/resources/monsterdb.h b/src/resources/monsterdb.h
index 5b2f3c2d..dc8b50cb 100644
--- a/src/resources/monsterdb.h
+++ b/src/resources/monsterdb.h
@@ -33,6 +33,8 @@ namespace MonsterDB
 {
     void init();
 
+    void setMonsterIdOffset(int offset);
+
     void readMonsterNode(xmlNodePtr node, const std::string &filename);
 
     void checkStatus();
diff --git a/src/resources/settingsmanager.cpp b/src/resources/settingsmanager.cpp
index b307d565..f4a40577 100644
--- a/src/resources/settingsmanager.cpp
+++ b/src/resources/settingsmanager.cpp
@@ -121,6 +121,14 @@ namespace SettingsManager
             return false;
         }
 
+        if (xmlStrEqual(node->name, BAD_CAST "monsters"))
+        {
+            if (XML::hasProperty(node, "offset"))
+            {
+                MonsterDB::setMonsterIdOffset(XML::getProperty(node, "offset", 0));
+            }
+        }
+
         // go through every node
         for_each_xml_child_node(childNode, node)
         {
diff --git a/src/utils/xml.cpp b/src/utils/xml.cpp
index d0f51230..2fb9d66b 100644
--- a/src/utils/xml.cpp
+++ b/src/utils/xml.cpp
@@ -92,6 +92,11 @@ namespace XML
         return mDoc ? xmlDocGetRootElement(mDoc) : nullptr;
     }
 
+    bool hasProperty(xmlNodePtr node, const char *name)
+    {
+        return xmlHasProp(node, BAD_CAST name) != nullptr;
+    }
+
     int getProperty(xmlNodePtr node, const char* name, int def)
     {
         int &ret = def;
diff --git a/src/utils/xml.h b/src/utils/xml.h
index 60355aa6..df8dd1bd 100644
--- a/src/utils/xml.h
+++ b/src/utils/xml.h
@@ -60,9 +60,9 @@ namespace XML
     };
 
     /**
-     * Gets an floating point property from an xmlNodePtr.
+     * Returns whether a certain property is present.
      */
-    double getFloatProperty(xmlNodePtr node, const char *name, double def);
+    bool hasProperty(xmlNodePtr node, const char *name);
 
     /**
      * Gets an integer property from an xmlNodePtr.
@@ -70,6 +70,11 @@ namespace XML
     int getProperty(xmlNodePtr node, const char *name, int def);
 
     /**
+     * Gets an floating point property from an xmlNodePtr.
+     */
+    double getFloatProperty(xmlNodePtr node, const char *name, double def);
+
+    /**
      * Gets a string property from an xmlNodePtr.
      */
     std::string getProperty(xmlNodePtr node, const char *name,