Fix script bytebuffer vector preallocation

We guesstimate the size of the buffer based on the initial script size. Not very accurate, but better than the alternatives.

Author: Foereaper

ElunaLoader.cpp

@@ -166,7 +166,6 @@ void ElunaLoader::LoadScripts()
 
 int ElunaLoader::LoadBytecodeChunk(lua_State* /*L*/, uint8* bytes, size_t len, BytecodeBuffer* buffer)
 {
-    buffer->reserve(buffer->size() + len);
     buffer->insert(buffer->end(), bytes, bytes + len);
     return 0;
 }
@@ -231,7 +230,8 @@ void ElunaLoader::ReadFiles(lua_State* L, std::string path)
 
                 // was file, try add
                 std::string filename = dir_iter->path().filename().generic_string();
-                ProcessScript(L, filename, fullpath, mapId);
+                size_t filesize = fs::file_size(dir_iter->path());
+                ProcessScript(L, filename, filesize, fullpath, mapId);
             }
         }
     }
@@ -272,7 +272,7 @@ bool ElunaLoader::CompileScript(lua_State* L, LuaScript& script)
     return true;
 }
 
-void ElunaLoader::ProcessScript(lua_State* L, std::string filename, const std::string& fullpath, int32 mapId)
+void ElunaLoader::ProcessScript(lua_State* L, std::string filename, const size_t& filesize, const std::string& fullpath, int32 mapId)
 {
     ELUNA_LOG_DEBUG("[Eluna]: ProcessScript checking file `%s`", fullpath.c_str());
 
@@ -293,6 +293,7 @@ void ElunaLoader::ProcessScript(lua_State* L, std::string filename, const std::s
     script.filename = filename;
     script.filepath = fullpath;
     script.modulepath = fullpath.substr(0, fullpath.length() - filename.length() - ext.length());
+    script.bytecode.reserve(filesize);
     script.mapId = mapId;
 
     // if compilation fails, we don't add the script 

ElunaLoader.h

@@ -69,7 +69,7 @@ class ElunaLoader
     void ReloadScriptCache();
     void ReadFiles(lua_State* L, std::string path);
     void CombineLists();
-    void ProcessScript(lua_State* L, std::string filename, const std::string& fullpath, int32 mapId);
+    void ProcessScript(lua_State* L, std::string filename, const size_t& filesize, const std::string& fullpath, int32 mapId);
     bool CompileScript(lua_State* L, LuaScript& script);
     static int LoadBytecodeChunk(lua_State* L, uint8* bytes, size_t len, BytecodeBuffer* buffer);