Persist the original radio name, and restore it on app start if the radio name is our radio name.

PiperOrigin-RevId: 464148898

internal/platform/implementation/shared/file.cc

@@ -16,6 +16,7 @@
 
 #include <algorithm>
 #include <cstddef>
+#include <ios>
 #include <memory>
 #include <string>
 
@@ -35,9 +36,11 @@ std::unique_ptr<IOFile> IOFile::CreateInputFile(
 
 IOFile::IOFile(const absl::string_view file_path, size_t size)
     : file_(std::string(file_path.data(), file_path.size()),
-            std::ios::binary | std::ios::in),
+            std::ios::binary | std::ios::in | std::ios::ate),
       path_(file_path),
-      total_size_(size) {}
+      total_size_(file_.tellg()) {
+  file_.seekg(0);
+}
 
 std::unique_ptr<IOFile> IOFile::CreateOutputFile(const absl::string_view path) {
   return std::unique_ptr<IOFile>(new IOFile(path));