BinaryReader: add a way to seek into the file.

src/UESaveFile/BinaryReader.cpp

@@ -45,6 +45,10 @@ auto BinaryReader::position() -> Long {
     return _ftelli64(_file);
 }
 
+auto BinaryReader::seek(Long position) -> bool {
+    return _fseeki64(_file, position, SEEK_SET) == 0;
+}
+
 void BinaryReader::closeFile() {
     std::fclose(_file);
     _file = nullptr;

src/UESaveFile/BinaryReader.h

@@ -36,6 +36,8 @@ class BinaryReader {
         auto eof() -> bool;
         auto position() -> Long;
 
+        auto seek(Long position) -> bool;
+
         void closeFile();
 
         auto readChar(char& value) -> bool;