37 lines
574 B
Go
37 lines
574 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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func (rot13 *rot13Reader) Read(b []byte) (int, error) {
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n, err := rot13.r.Read(b)
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if err != nil {
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return n, err
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}
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for i, e := range b {
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b[i] = rot13shift(e)
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}
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return n, nil
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}
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func rot13shift(b byte) byte {
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switch {
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case (b >= 'A' && b <= 'M') || (b >= 'a' && b <= 'm'): b += 13
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case (b >= 'N' && b <= 'Z') || (b >= 'n' && b <= 'z'): b -= 13
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}
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return b
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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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