36 lines
553 B
Go
36 lines
553 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 (r rot13Reader) Read(p []byte) (n int, err error) {
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n, err = r.r.Read(p)
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for i := range p[:n] {
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p[i] = rot13(p[i])
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}
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return
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}
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func rot13(b byte) byte {
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var a, z, A, Z byte = 'a', 'z', 'A', 'Z'
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if a < b && b < z {
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b = a + ((b - a + 13) % 26)
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} else if A < b && b < Z {
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b = A + ((b - A + 13) % 26)
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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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