[jak3] Support jaextern.str, stub for blue fog fix (#3455)

decompiler/data/StrFileReader.cpp

@@ -188,6 +188,21 @@ FullName extract_name(const std::string& file_info_name) {
 
 }  // namespace
 
+std::string StrFileReader::get_chunk_art_name(int idx) const {
+  const auto& file_info_string = get_art_group_file_info_string();
+  const auto& chunk = m_chunks.at(idx);
+  int offset;
+  if (find_string_in_data(chunk.data(), int(chunk.size()), file_info_string, &offset)) {
+    offset += file_info_string.length();
+  } else {
+    ASSERT_MSG(false, fmt::format("did not find string '{}'", file_info_string));
+  }
+
+  // extract the name info as a "name" + "chunk id" + "-ag.go" format.
+  return extract_name(get_string_of_max_length((const char*)(chunk.data() + offset), 128)).name +
+         "-ag";
+}
+
 /*!
  * Look inside the chunks to determine the source file name.
  * Does a lot of checking, might not work in future versions without some updating.