43 lines
835 B
Go
43 lines
835 B
Go
package main
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import (
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"io"
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"os"
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"strings"
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)
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type rot13Reader struct {
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r io.Reader
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}
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var rot13Input []byte = []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")
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var rot13Output []byte = []byte("NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm")
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func indexOf(s []byte, b byte) int {
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for i, v := range s {
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if v == b {
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return i
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}
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}
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return -1
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}
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func (r rot13Reader) Read(b []byte) (n int, err error) {
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n, err = r.r.Read(b)
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if err == nil {
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for i := 0; i < n; i++ {
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c := b[i]
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if j := indexOf(rot13Input, c); j > -1 {
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b[i] = rot13Output[j]
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}
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}
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}
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return n, err
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}
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func main() {
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s := strings.NewReader("Lbh penpxrq gur pbqr!")
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r := rot13Reader{s}
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io.Copy(os.Stdout, &r)
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}
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