package main import (
"io"
"os"
"strings"
"fmt"
) type rot13Reader struct {
r io.Reader
}
func (rot13 rot13Reader)Read(p []byte) (n int, err error){
n,err = rot13.r.Read(p)
for i := ; i < len(p); i++ {
if (p[i] >= 'A' && p[i] < 'N') || (p[i] >='a' && p[i] < 'n') {
p[i] +=
} else if (p[i] > 'M' && p[i] <= 'Z') || (p[i] > 'm' && p[i] <= 'z'){
p[i] -=
}
}
return
}
func main() {
s := strings.NewReader(
"Lbh penpxrq gur pbqr!")
r := rot13Reader{s}
fmt.Println(r)
io.Copy(os.Stdout, &r)
}
go官方教程的答案地址https://gist.github.com/zyxar/2317744
A common pattern is an io.Reader that wraps another io.Reader
, modifying the stream in some way.
For example, the gzip.NewReader function takes an io.Reader
(a stream of gzipped data) and returns a *gzip.Reader
that also implements io.Reader
(a stream of the decompressed data).
Implement a rot13Reader
that implements io.Reader
and reads from anio.Reader
, modifying the stream by applying the ROT13 substitution cipher to all alphabetical characters.
The rot13Reader
type is provided for you. Make it an io.Reader
by implementing its Read
method.