fix copied filepos

stepmania/src/RageFile.cpp

@@ -66,14 +66,17 @@ RageFile::RageFile( const CString& path, RageFile::OpenMode mode )
 
 RageFile::RageFile( const RageFile &cpy )
 {
+	ResetBuf();
+
+	/* This will copy the file driver, including its internal file pointer. */
 	m_File = cpy.m_File->Copy( *this );
 	m_Path = cpy.m_Path;
 	m_Mode = cpy.m_Mode;
 	m_Error = cpy.m_Error;
 	m_EOF = cpy.m_EOF;
 	m_FilePos = cpy.m_FilePos;
-
-	ResetBuf();
+	memcpy( this->m_Buffer, cpy.m_Buffer, cpy.m_BufUsed );
+	m_BufUsed = cpy.m_BufUsed;
 }
 
 CString RageFile::GetPath() const

stepmania/src/RageFileDriverDirect.cpp

@@ -246,6 +246,8 @@ RageFileObj *RageFileObjDirect::Copy( RageFile &p ) const
 	if( ret == NULL )
 		RageException::Throw("Couldn't reopen \"%s\": %s", path.c_str(), strerror(err) );
 
+	ret->Seek( parent.Tell() );
+
 	return ret;
 }