fill reads a new chunk into the buffer.
()
| 23 | |
| 24 | // fill reads a new chunk into the buffer. |
| 25 | func (r *reader) fill() { |
| 26 | // Slide existing data to beginning. |
| 27 | if r.r > 0 { |
| 28 | copy(r.buf[:], r.buf[r.r:r.w]) |
| 29 | r.w -= r.r |
| 30 | r.r = 0 |
| 31 | } |
| 32 | if r.w >= len(r.buf) { |
| 33 | panic("tried to fill full buffer") |
| 34 | } |
| 35 | // Read new data: try a limited number of times. |
| 36 | for i := 100; i > 0; i-- { |
| 37 | n, err := r.rd.Read(r.buf[r.w:]) |
| 38 | if n < 0 { |
| 39 | panic("reader returned negative count from Read") |
| 40 | } |
| 41 | r.w += n |
| 42 | if err != nil { |
| 43 | r.err = err |
| 44 | return |
| 45 | } |
| 46 | if n > 0 { |
| 47 | return |
| 48 | } |
| 49 | } |
| 50 | r.err = io.ErrNoProgress |
| 51 | } |
| 52 | |
| 53 | func (r *reader) buffered() []byte { |
| 54 | return r.buf[r.r:r.w] |