| bufio | Package bufio implements buffered I/O. It wraps an io.Reader or io.Writer object, creating another object (Reader or Writer) that also implements the interface but provides buffering and some help for textual I/O. |
| bytes | Package bytes implements functions for the manipulation of byte slices. |
| encoding/binary | Package binary implements simple translation between numbers and byte sequences and encoding and decoding of varints. |
| image | Package image implements a basic 2-D image library. |
| image/draw | Package draw provides image composition functions. |
| image/png | Package png implements a PNG image decoder and encoder. |
| io | Package io provides basic interfaces to I/O primitives. |