Created
April 21, 2013 07:28
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Golang tour #60
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| package main | |
| import ( | |
| "io" | |
| "os" | |
| "strings" | |
| ) | |
| type rot13Reader struct { | |
| r io.Reader | |
| } | |
| func (r rot13Reader) Read(p []byte) (int, error){ | |
| n, err := r.r.Read(p) | |
| if err != nil || n == 0 { | |
| return 0, io.EOF | |
| } | |
| for i,c := range p { | |
| switch { | |
| case (c >= 'n' && c <= 'z') || (c >= 'N' && c <= 'Z'): | |
| p[i] -= 13 | |
| case (c >= 'a' && c < 'n') || (c >= 'A' && c < 'N'): | |
| p[i] += 13 | |
| } | |
| } | |
| return n, nil | |
| } | |
| func main() { | |
| s := strings.NewReader( | |
| "Lbh penpxrq gur pbqr!") | |
| r := rot13Reader{s} | |
| io.Copy(os.Stdout, &r) | |
| } |
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