Created
January 6, 2014 02:24
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Rot13 en/de-coder in Go
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| // ROT13 reader | |
| // See: http://en.wikipedia.org/wiki/Rot13 | |
| package main | |
| import ( | |
| "bytes" | |
| "io" | |
| "os" | |
| "strings" | |
| ) | |
| type rot13Reader struct { | |
| r io.Reader | |
| } | |
| func rot13(r rune) rune { | |
| switch { | |
| case r >= 'a' && r <= 'z': | |
| return 'a' + ((r - 'a' + 13) % 26) | |
| case r >= 'A' && r <= 'Z': | |
| return 'A' + ((r - 'A' + 13) % 26) | |
| } | |
| return r | |
| } | |
| func (rot *rot13Reader) Read(p []byte) (n int, err error) { | |
| n, err = rot.r.Read(p) | |
| n = copy(p, bytes.Map(rot13, p[:n])) | |
| return n, err | |
| } | |
| func main() { | |
| s := strings.NewReader( | |
| "Lbh penpxrq gur pbqr!\n") | |
| r := &rot13Reader{s} | |
| io.Copy(os.Stdout, r) | |
| } |
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