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rot13 fix and extending functionality #38

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rot13 fix and extending functionality #38

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28 changes: 16 additions & 12 deletions 015_understanding-TCP-servers/07_tcp-apps/01_rot13/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@ import (
"fmt"
"log"
"net"
"strings"
"unicode"
)

func main() {
Expand All @@ -28,23 +28,27 @@ func main() {
func handle(conn net.Conn) {
scanner := bufio.NewScanner(conn)
for scanner.Scan() {
ln := strings.ToLower(scanner.Text())
bs := []byte(ln)
r := rot13(bs)
ln := scanner.Text()
r := rot13(ln)

fmt.Fprintf(conn, "%s - %s\n\n", ln, r)
}
}

func rot13(bs []byte) []byte {
var r13 = make([]byte, len(bs))
for i, v := range bs {
// ascii 97 - 122
if v <= 109 {
r13[i] = v + 13
func rot13(ln string) string {
var r13 = make([]rune, len(ln))
for i, v := range ln {
if unicode.IsLower(v) && v < unicode.MaxASCII {
r13[i] = rotateCharacter(v, 'a')
} else if unicode.IsUpper(v) && v < unicode.MaxASCII {
r13[i] = rotateCharacter(v, 'A')
} else {
r13[i] = v - 13
r13[i] = v
}
}
return r13
return string(r13)
}

func rotateCharacter(v rune, base rune) rune {
return (v - base + 13) % 26 + base
}