31 lines
473 B
Go
31 lines
473 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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func (r rot13Reader) Read(b []byte) (int, error) {
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n, err := r.r.Read(b)
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for i := 0; i < n; i++ {
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switch {
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case 'A' <= b[i] && 'Z' >= b[i]:
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b[i] = 'A' + (b[i]-'A'+13)%26
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case 'a' <= b[i] && 'z' >= b[i]:
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b[i] = 'a' + (b[i]-'a'+13)%26
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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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