You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gres_http_file.go
    path of file: ./repos/gf/os/gres
    
    the code of the file until where you have to start completion: // Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed wit
    
func (f *File) Seek(offset int64, whence int) (n int64, err error) {
	reader, err := f.getReader()
	if err != nil {
		return 0, err
	}
	if n, err = reader.Seek(offset, whence); err != nil {
		err = gerror.Wrapf(err, `seek failed for offset %d, whence %d`, offset, whence)
	}
	return
}