Method Seek

tools/copycallback.go:51–62

Seek wraps the underlying Seeker's "Seek" method, updating the number of bytes that have been consumed by this reader.

(offset int64, whence int)

// Seek wraps the underlying Seeker's "Seek" method, updating the number of
// bytes that have been consumed by this reader.
func (r *BodyWithCallback) Seek(offset int64, whence int) (int64, error) {
	switch whence {
	case io.SeekStart:
		r.readSize = offset
	case io.SeekCurrent:
		r.readSize += offset
	case io.SeekEnd:
		r.readSize = r.totalSize + offset
	}

	return r.ReadSeekCloser.Seek(offset, whence)
}

// ResetProgress calls the callback with a negative read size equal to the
// total number of bytes read so far, effectively "resetting" the progress.