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main.go
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main.go
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package main
import (
"io"
"log"
"net"
)
type Rot13Reader struct {
io.Reader
}
func (rot13 *Rot13Reader) Read(p []byte) (int, error) {
n, err := rot13.Reader.Read(p)
for i, v := range p[:n] {
if v <= 'z' && v >= 'a' {
p[i] = v + 13
if p[i] > 'z' {
p[i] -= 26
}
} else if v <= 'Z' && v >= 'A' {
p[i] = v + 13
if p[i] > 'Z' {
p[i] -= 26
}
} else {
p[i] = v
}
}
return n, err
}
func rot13(rdr io.Reader) io.Reader {
return &Rot13Reader{rdr}
}
func handleConn(conn net.Conn) {
defer conn.Close()
io.Copy(conn, rot13(conn))
}
func main() {
server, err := net.Listen("tcp", ":9000")
if err != nil {
log.Fatalln(err.Error())
}
defer server.Close()
for {
conn, err := server.Accept()
if err != nil {
log.Fatalln(err.Error())
}
go handleConn(conn)
}
}