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- package zioutil
- import (
- "io"
- "sync"
- )
- func SlowCopy(w io.Writer, r io.Reader, stepsize int) (n int, err error) {
- rbuf := make([]byte, stepsize)
- cnt := 0
- for {
- n, err := r.Read(rbuf)
- if n == 0 {
- continue
- }
- if err != nil {
- return cnt, err
- }
- n, err = w.Write(rbuf)
- if err != nil {
- return cnt, err
- }
- cnt += n
- }
- }
- func SlowBidiCopy(rw1, rw2 io.ReadWriter, stepsize12, stepsize21 int) (n12, n21 int, err12, err21 error) {
- wg := sync.WaitGroup{}
- wg.Add(2)
- go func() {
- n12, err12 = SlowCopy(rw2, rw1, stepsize12)
- wg.Done()
- }()
- go func() {
- n21, err21 = SlowCopy(rw1, rw2, stepsize21)
- wg.Done()
- }()
- wg.Wait()
- return
- }
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