fix regression on writing txt files into lsts

writing txt files to lst failed because the trailing null character was missing

Author: Flow86

.gitignore

@@ -1 +1,3 @@
-build
+/build
+/out
+/.vs

src/ArchivItem_Text.cpp

@@ -140,8 +140,8 @@ int libsiedler2::ArchivItem_Text::write(std::ostream& file, bool conversion) con
     if(text_.empty())
         return ErrorCode::NONE;
 
-    std::string convText = getFileText(conversion);
-    if(!file.write(&convText[0], convText.size()))
+    const std::string convText = getFileText(conversion);
+    if(!file.write(convText.data(), convText.size()))
         return ErrorCode::UNEXPECTED_EOF;
 
     return ErrorCode::NONE;

src/WriteTXT.cpp

@@ -73,7 +73,8 @@ int libsiedler2::loader::WriteTXT(const boost::filesystem::path& filepath, const
             if(item && !item->getText().empty())
             {
                 starts[i] = size;
-                size += static_cast<uint32_t>(item->getFileText(conversion).size());
+                // add necessary trailing NULL
+                size += static_cast<uint32_t>(item->getFileText(conversion).size() + 1);
             }
         }
 
@@ -88,6 +89,8 @@ int libsiedler2::loader::WriteTXT(const boost::filesystem::path& filepath, const
             {
                 if(int ec = item->write(fs.getStream(), conversion))
                     return ec;
+                // add necessary trailing NULL
+                fs << '\0';
             }
         }
     }