47 lines
683 B
Go
47 lines
683 B
Go
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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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const capitalA = 65
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const capitalZ = 89
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const capitalMid = 77
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const A = 97
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const Z = 122
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const Mid = 109
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func (rot *rot13Reader) Read(b []byte) (n int, err error) {
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n, err = rot.r.Read(b)
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for i := 0; i < n; i++ {
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if b[i] <= capitalZ && b[i] >= capitalA {
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if b[i] <= capitalMid {
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b[i] = b[i] + 13
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} else {
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b[i] = b[i] - 13
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}
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} else if b[i] <= Z && b[i] >= A {
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if b[i] <= Mid {
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b[i] = b[i] + 13
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} else {
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b[i] = b[i] - 13
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}
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}
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}
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return
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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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