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mrfade/rot13Reader.go

Created October 22, 2022 22:22
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A Tour of Go Exercise: rot13Reader
Raw
rot13Reader.go
package main
import (
"io"
"os"
"strings"
)
type rot13Reader struct {
r io.Reader
}
func (r rot13Reader) Read(b []byte) (int, error) {
n, err := r.r.Read(b)
if err != nil {
return 0, err
}
for i := 0; i < n; i++ {
if b[i] >= 'A' && b[i] <= 'Z' {
b[i] = 'A' + (b[i] - 'A' + 13) % 26
} else if b[i] >= 'a' && b[i] <= 'z' {
b[i] = 'a' + (b[i] - 'a' + 13) % 26
}
}
return n, nil
}
func main() {
s := strings.NewReader("Lbh penpxrq gur pbqr!")
r := rot13Reader{s}
io.Copy(os.Stdout, &r)
}
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