func ExampleIsPrint() {
c := strconv.IsPrint('\u263a')
fmt.Println(c)
bel := strconv.IsPrint('\007')
fmt.Println(bel)
// Output:
// true
// false
}
func appendQuoted(buf []byte, s string) []byte {
var runeTmp [utf8.UTFMax]byte
for width := 0; len(s) > 0; s = s[width:] {
r := rune(s[0])
width = 1
if r >= utf8.RuneSelf {
r, width = utf8.DecodeRuneInString(s)
}
if width == 1 && r == utf8.RuneError {
buf = append(buf, `\x`...)
buf = append(buf, lowerhex[s[0]>>4])
buf = append(buf, lowerhex[s[0]&0xF])
continue
}
if r == rune('"') || r == '\\' { // always backslashed
buf = append(buf, '\\')
buf = append(buf, byte(r))
continue
}
if strconv.IsPrint(r) {
n := utf8.EncodeRune(runeTmp[:], r)
buf = append(buf, runeTmp[:n]...)
continue
}
buf = appendRune(buf, s, r)
}
return buf
}
func (s sliceExpr) ProgString() string {
var b bytes.Buffer
// If it's all Char, we can do a prettier job.
if s.allChars() {
b.WriteRune('\'')
for _, v := range s {
c := rune(v.(value.Char))
esc := charEscape[c]
if esc != "" {
b.WriteString(esc)
continue
}
if !strconv.IsPrint(c) {
if c <= 0xFFFF {
fmt.Fprintf(&b, "\\u%04x", c)
} else {
fmt.Fprintf(&b, "\\U%08x", c)
}
continue
}
b.WriteRune(c)
}
b.WriteRune('\'')
} else {
for i, v := range s {
if i > 0 {
b.WriteRune(' ')
}
b.WriteString(v.ProgString())
}
}
return b.String()
}
func (this *Handler) HandleRegister(login string, password string) string {
result := map[string]string{"result": "ok"}
salt := time.Now().Unix()
fmt.Println("register salt: ", salt)
hash := GetMD5Hash(password + strconv.Itoa(int(salt)))
passHasInvalidChars := false
for i := 0; i < len(password); i++ {
if strconv.IsPrint(rune(password[i])) == false {
passHasInvalidChars = true
break
}
}
isExist, _, _, _ := IsExist(login)
if isExist == true {
result["result"] = "loginExists"
} else if !MatchRegexp("^[a-zA-Z0-9]{2,36}$", login) {
result["result"] = "badLogin"
} else if !MatchRegexp("^.{6,36}$", password) && !passHasInvalidChars {
result["result"] = "badPassword"
} else {
db := connect.DBConnect()
query := connect.DBInsert("users", []string{"login", "password", "salt"})
stmt, err := db.Prepare(query)
utils.HandleErr("[HandleRegister] Prepare error :", err)
defer stmt.Close()
_, err = stmt.Exec(login, hash, salt)
utils.HandleErr("[HandleRegister] Query error :", err)
}
response, err := json.Marshal(result)
utils.HandleErr("[HandleRegister] json.Marshal: ", err)
return string(response)
}
func (this *RegistrationController) Register(login, password, email, role string) (result string, regId int) {
result = "ok"
salt := strconv.Itoa(int(time.Now().Unix()))
pass := utils.GetMD5Hash(password + salt)
passHasInvalidChars := false
for i := 0; i < len(password); i++ {
if strconv.IsPrint(rune(password[i])) == false {
passHasInvalidChars = true
break
}
}
if db.IsExists("users", []string{"login"}, []interface{}{login}) == true {
result = "loginExists"
} else if !utils.MatchRegexp("^[a-zA-Z0-9]{2,36}$", login) {
result = "badLogin"
} else if !utils.MatchRegexp("^.{6,36}$", password) || passHasInvalidChars {
result = "badPassword"
// } else if bad email {
} else {
token := utils.GetRandSeq(HASH_SIZE)
if !mailer.SendConfirmEmail(login, email, token) {
return "badEmail", -1
}
var userId int
this.GetModel("users").
LoadModelData(map[string]interface{}{
"login": login,
"pass": pass,
"salt": salt,
"role": role,
"token": token,
"enabled": false}).
QueryInsert("RETURNING id").
Scan(&userId)
var faceId int
this.GetModel("faces").
LoadModelData(map[string]interface{}{"user_id": userId}).
QueryInsert("RETURNING id").
Scan(&faceId)
this.GetModel("registrations").
LoadModelData(map[string]interface{}{"face_id": faceId, "event_id": 1, "status": false}).
QueryInsert("RETURNING id").
Scan(®Id)
return result, regId
}
return result, -1
}
// cprotect returns its argument if printable, else a backslash form.
func cprotect(r rune) string {
if strconv.IsPrint(r) {
return string(r)
} else {
s := strconv.QuoteRune(r)
return s[1 : len(s)-1]
}
}
/*
Returns true when the string is entirely made of printable runes, false otherwise.
*/
func isPrintableString(str string) bool {
for _, runeValue := range str {
if !strconv.IsPrint(runeValue) {
return false
}
}
return true
}
func (v *OctetString) String() string {
for _, c := range v.Value {
if !strconv.IsPrint(rune(c)) {
return toHexStr(v.Value, ":")
}
}
return string(v.Value)
}
func isValueBinary(value []byte) bool {
for _, r := range value {
if strconv.IsPrint(rune(r)) == false {
return true
}
}
return false
}
func isPrint(s string) bool {
for _, c := range s {
if !strconv.IsPrint(c) {
return false
}
}
return true
}
// fmt_unicode formats a uint64 as "U+0078" or with f.sharp set as "U+0078 'x'".
func (f *fmt) fmt_unicode(u uint64) {
buf := f.intbuf[0:]
// With default precision set the maximum needed buf length is 18
// for formatting -1 with %#U ("U+FFFFFFFFFFFFFFFF") which fits
// into the already allocated intbuf with a capacity of 68 bytes.
prec := 4
if f.precPresent && f.prec > 4 {
prec = f.prec
// Compute space needed for "U+" , number, " '", character, "'".
width := 2 + prec + 2 + utf8.UTFMax + 1
if width > len(buf) {
buf = make([]byte, width)
}
}
// Format into buf, ending at buf[i]. Formatting numbers is easier right-to-left.
i := len(buf)
// For %#U we want to add a space and a quoted character at the end of the buffer.
if f.sharp && u <= utf8.MaxRune && strconv.IsPrint(rune(u)) {
i--
buf[i] = '\''
i -= utf8.RuneLen(rune(u))
utf8.EncodeRune(buf[i:], rune(u))
i--
buf[i] = '\''
i--
buf[i] = ' '
}
// Format the Unicode code point u as a hexadecimal number.
for u >= 16 {
i--
buf[i] = udigits[u&0xF]
prec--
u >>= 4
}
i--
buf[i] = udigits[u]
prec--
// Add zeros in front of the number until requested precision is reached.
for prec > 0 {
i--
buf[i] = '0'
prec--
}
// Add a leading "U+".
i--
buf[i] = '+'
i--
buf[i] = 'U'
oldZero := f.zero
f.zero = false
f.pad(buf[i:])
f.zero = oldZero
}
func (v *SnmpOctetString) IsPrintable() bool {
isPrintable := true
for _, c := range []byte(*v) {
if !strconv.IsPrint(rune(c)) {
isPrintable = false
break
}
}
return isPrintable
}
func quote(b byte) string {
switch b {
case '\'', '"', '`':
return string(rune(b))
}
if b < utf8.RuneSelf && strconv.IsPrint(rune(b)) {
return strconv.QuoteRune(rune(b))
}
return fmt.Sprintf(`%.2x`, b)
}
// _isPrint() returns true if str is printable
//
// @private method
func _isPrint(str string) bool {
for _, c := range str {
if !strconv.IsPrint(rune(c)) {
return false
}
}
return true
}
func (c *asciiChunk) prepareBuf() {
for i := 0; i < len(c.buf); i++ {
for {
c.nextAscii = (c.nextAscii + 1) % 128
if strconv.IsPrint(rune(c.nextAscii)) && c.nextAscii != '\n' {
break
}
}
c.buf[i] = c.nextAscii
}
}
// Print a graph in DOT format given the start node.
//
// $ dot -Tps input.dot -o output.ps
func writeDotGraph(outf *os.File, start *node, id string) {
done := make(map[*node]bool)
var show func(*node)
show = func(u *node) {
if u.accept {
fmt.Fprintf(outf, " %v[style=filled,color=green];\n", u.n)
}
done[u] = true
for _, e := range u.e {
// We use -1 to denote the dead end node in DFAs.
if e.dst.n == -1 {
continue
}
label := ""
runeToDot := func(r rune) string {
if strconv.IsPrint(r) {
return fmt.Sprintf("%v", string(r))
}
return fmt.Sprintf("U+%X", int(r))
}
switch e.kind {
case kRune:
label = fmt.Sprintf("[label=%q]", runeToDot(e.r))
case kWild:
label = "[color=blue]"
case kClass:
label = "[label=\"["
if e.negate {
label += "^"
}
for i := 0; i < len(e.lim); i += 2 {
label += runeToDot(e.lim[i])
if e.lim[i] != e.lim[i+1] {
label += "-" + runeToDot(e.lim[i+1])
}
}
label += "]\"]"
}
fmt.Fprintf(outf, " %v -> %v%v;\n", u.n, e.dst.n, label)
}
for _, e := range u.e {
if !done[e.dst] {
show(e.dst)
}
}
}
fmt.Fprintf(outf, "digraph %v {\n 0[shape=box];\n", id)
show(start)
fmt.Fprintln(outf, "}")
}
// Returns an escaped version of rune. Escaping letters that produce control
// codes (n => \n) will produce undesirable results.
//
// Modified version of strconv/quote.go:quoteWith
func escape(r rune) string {
if r == utf8.RuneError {
return `\uFFFD`
}
if strconv.IsPrint(r) {
// Printable characters just a get a backslash prepended. Lowercase ascii characters that are used when escaping control codes
return `\` + string(r)
}
switch r {
case '\a':
return `\a`
case '\b':
return `\b`
case '\f':
return `\f`
case '\n':
return `\n`
case '\r':
return `\r`
case '\t':
return `\t`
case '\v':
return `\v`
default:
switch {
case r < ' ':
buf := make([]byte, 0, 4)
buf = append(buf, `\x`...)
buf = append(buf, lowerhex[r>>4])
buf = append(buf, lowerhex[r&0xF])
return string(buf)
case r > utf8.MaxRune:
return string(utf8.RuneError)
case r < 0x10000:
buf := make([]byte, 0, 6)
buf = append(buf, `\u`...)
for s := 12; s >= 0; s -= 4 {
buf = append(buf, lowerhex[r>>uint(s)&0xF])
}
return string(buf)
default:
buf := make([]byte, 0, 10)
buf = append(buf, `\U`...)
for s := 28; s >= 0; s -= 4 {
buf = append(buf, lowerhex[r>>uint(s)&0xF])
}
return string(buf)
}
}
}
// rewrite rewrites a subname to having only printable characters and no white
// space.
func rewrite(s string) string {
b := []byte{}
for _, r := range s {
switch {
case isSpace(r):
b = append(b, '_')
case !strconv.IsPrint(r):
s := strconv.QuoteRune(r)
b = append(b, s[1:len(s)-1]...)
default:
b = append(b, string(r)...)
}
}
return string(b)
}
// Escape stdout/stderr so the Jenkins YAMLish parser doesn't barf on
// it. This escaping is crude (it masks all colons as something humans
// will hopefully see as a colon, for instance), but it should get the
// job done without pulling in a whole YAML package.
func escapeOutput(s string) (out string) {
for _, r := range s {
switch {
case r == '\n':
out += string(r)
case !strconv.IsPrint(r):
out += " "
case r == ':':
out += "\ua789" // "꞉", modifier letter colon
default:
out += string(r)
}
}
return
}
// Currency in computer parsable form
func (c Currency) Machine() string {
switch c.Type() {
case CT_XRP:
return "XRP"
case CT_STANDARD:
// Check for unprintable characters
for _, r := range string(c[12:15]) {
if !strconv.IsPrint(r) {
return string(b2h(c[:]))
}
}
return string(c[12:15])
default:
return string(b2h(c[:]))
}
}
func main() {
c := strconv.IsPrint('\u263a')
fmt.Println(c)
bel := strconv.IsPrint('\007')
fmt.Println(bel)
fmt.Println(strconv.IsPrint(' '))
fmt.Println(strconv.IsPrint('\t'))
fmt.Println(strconv.IsPrint('\n'))
fmt.Println(strconv.IsPrint('\r'))
}
// Write writes the sections and options to the io.Writer in INI format.
func (c *Config) Write(out io.Writer) error {
for _, cmt := range c.comments {
fmt.Fprintln(out, "; "+cmt)
}
if len(c.comments) > 0 {
fmt.Fprintln(out)
}
for _, sect := range c.sections {
fmt.Fprintf(out, "[%s]\n", sect.name)
for _, cmt := range sect.comments {
fmt.Fprintln(out, "; "+cmt)
}
for _, opt := range sect.options {
val := opt.value
if len(val) == 0 {
continue
}
// Quote the string if it begins or ends with space
needsQuoting := val[0] == ' ' || val[len(val)-1] == ' '
if !needsQuoting {
// Quote the string if it contains any unprintable characters
for _, r := range val {
if !strconv.IsPrint(r) {
needsQuoting = true
break
}
}
}
if needsQuoting {
val = strconv.Quote(val)
}
fmt.Fprintf(out, "%s=%s\n", opt.name, val)
}
fmt.Fprintln(out)
}
return nil
}
func main() {
log.SetFlags(0)
args := os.Args[1:]
if len(args) < 2 {
log.Fatal("usage: roxor <file> <crib>")
}
filename := args[0]
crib := []byte(args[1])
if len(crib) < 2 {
log.Fatal("error: crib too short")
}
ciphertext, err := ioutil.ReadFile(filename)
if err != nil {
log.Fatal(err)
}
if len(ciphertext) < len(crib) {
log.Fatal("error: ciphertext too short")
}
attackCipher(ciphertext, crib, func(m Match) {
fmt.Printf("Found text at 0x%x (XOR key 0x%02x)\n", m.offset, m.key)
fmt.Printf(" preview: ")
for i, ch := range ciphertext[m.offset:] {
if i >= PreviewSize {
break
}
ch ^= m.key
if !strconv.IsPrint(rune(ch)) {
ch = '.'
}
fmt.Printf("%c", ch)
}
fmt.Println()
})
}
// return ui8v field as a string
func union_ui8v_string(cbytes [8]byte, value_len _Ctype_gsize) (result string) {
var ptr uint64
var err error
buf := bytes.NewBuffer(cbytes[:])
if err = binary.Read(buf, binary.LittleEndian, &ptr); err != nil { // read bytes as uint64
return
}
up := (unsafe.Pointer(uintptr(ptr))) // convert the uint64 into a pointer
length := (_Ctype_int)(value_len)
gobytes := C.GoBytes(up, length)
for i := 0; i < int(length); i++ {
if !strconv.IsPrint(rune(gobytes[i])) {
// can't pass gobytes & length to union_ui8v_hexstring() -
// it's also used for TYPE_OPAQUE
return union_ui8v_hexstring(cbytes, value_len)
}
}
return string(gobytes)
}
// bodyRepr returns representation of body depending on content type.
// It may be indented, shortened or returned as is.
// It returns nil for empty body.
func bodyRepr(contentType string, body []byte) []byte {
if len(body) == 0 {
return nil
}
switch {
case strings.Contains(contentType, "json"):
return []byte(jsons.ParseBytes(body).Indent())
default:
for _, r := range string(body) {
switch {
case r == '\n':
continue
case strconv.IsPrint(r):
continue
default:
return []byte(fmt.Sprintf("[%d bytes data]", len(body)))
}
}
return body
}
}
func appendQuoted(buf []byte, s string) []byte {
var runeTmp [utf8.UTFMax]byte
for width := 0; len(s) > 0; s = s[width:] {
r := rune(s[0])
width = 1
if r >= utf8.RuneSelf {
r, width = utf8.DecodeRuneInString(s)
}
if width == 1 && r == utf8.RuneError {
buf = append(buf, `\x`...)
buf = append(buf, lowerhex[s[0]>>4])
buf = append(buf, lowerhex[s[0]&0xF])
continue
}
if r == rune('"') || r == '\\' { // always backslashed
buf = append(buf, '\\')
buf = append(buf, byte(r))
continue
}
if strconv.IsPrint(r) {
n := utf8.EncodeRune(runeTmp[:], r)
buf = append(buf, runeTmp[:n]...)
continue
}
switch r {
case '\a':
buf = append(buf, `\a`...)
case '\b':
buf = append(buf, `\b`...)
case '\f':
buf = append(buf, `\f`...)
case '\n':
buf = append(buf, `\n`...)
case '\r':
buf = append(buf, `\r`...)
case '\t':
buf = append(buf, `\t`...)
case '\v':
buf = append(buf, `\v`...)
default:
switch {
case r < ' ':
buf = append(buf, `\x`...)
buf = append(buf, lowerhex[s[0]>>4])
buf = append(buf, lowerhex[s[0]&0xF])
case r > utf8.MaxRune:
r = 0xFFFD
fallthrough
case r < 0x10000:
buf = append(buf, `\u`...)
for s := 12; s >= 0; s -= 4 {
buf = append(buf, lowerhex[r>>uint(s)&0xF])
}
default:
buf = append(buf, `\U`...)
for s := 28; s >= 0; s -= 4 {
buf = append(buf, lowerhex[r>>uint(s)&0xF])
}
}
}
}
return buf
}
// integer; interprets prec but not wid. Once formatted, result is sent to pad()
// and then flags are cleared.
func (f *fmt) integer(a int64, base uint64, signedness bool, digits string) {
// precision of 0 and value of 0 means "print nothing"
if f.precPresent && f.prec == 0 && a == 0 {
return
}
negative := signedness == signed && a < 0
if negative {
a = -a
}
var buf []byte = f.intbuf[0:]
if f.widPresent || f.precPresent || f.plus || f.space {
width := f.wid + f.prec // Only one will be set, both are positive; this provides the maximum.
if base == 16 && f.sharp {
// Also adds "0x".
width += 2
}
if f.unicode {
// Also adds "U+".
width += 2
if f.uniQuote {
// Also adds " 'x'".
width += 1 + 1 + utf8.UTFMax + 1
}
}
if negative || f.plus || f.space {
width++
}
if width > nByte {
// We're going to need a bigger boat.
buf = make([]byte, width)
}
}
// two ways to ask for extra leading zero digits: %.3d or %03d.
// apparently the first cancels the second.
prec := 0
if f.precPresent {
prec = f.prec
f.zero = false
} else if f.zero && f.widPresent && !f.minus && f.wid > 0 {
prec = f.wid
if negative || f.plus || f.space {
prec-- // leave room for sign
}
}
// format a into buf, ending at buf[i]. (printing is easier right-to-left.)
// a is made into unsigned ua. we could make things
// marginally faster by splitting the 32-bit case out into a separate
// block but it's not worth the duplication, so ua has 64 bits.
i := len(buf)
ua := uint64(a)
// use constants for the division and modulo for more efficient code.
// switch cases ordered by popularity.
switch base {
case 10:
for ua >= 10 {
i--
next := ua / 10
buf[i] = byte('0' + ua - next*10)
ua = next
}
case 16:
for ua >= 16 {
i--
buf[i] = digits[ua&0xF]
ua >>= 4
}
case 8:
for ua >= 8 {
i--
buf[i] = byte('0' + ua&7)
ua >>= 3
}
case 2:
for ua >= 2 {
i--
buf[i] = byte('0' + ua&1)
ua >>= 1
}
default:
panic("fmt: unknown base; can't happen")
}
i--
buf[i] = digits[ua]
for i > 0 && prec > len(buf)-i {
i--
buf[i] = '0'
}
// Various prefixes: 0x, -, etc.
if f.sharp {
switch base {
case 8:
if buf[i] != '0' {
i--
buf[i] = '0'
}
case 16:
// Add a leading 0x or 0X.
i--
buf[i] = digits[16]
i--
buf[i] = '0'
}
}
if f.unicode {
i--
buf[i] = '+'
i--
buf[i] = 'U'
}
if negative {
i--
buf[i] = '-'
} else if f.plus {
i--
buf[i] = '+'
} else if f.space {
i--
buf[i] = ' '
}
// If we want a quoted char for %#U, move the data up to make room.
if f.unicode && f.uniQuote && a >= 0 && a <= utf8.MaxRune && strconv.IsPrint(rune(a)) {
runeWidth := utf8.RuneLen(rune(a))
width := 1 + 1 + runeWidth + 1 // space, quote, rune, quote
copy(buf[i-width:], buf[i:]) // guaranteed to have enough room.
i -= width
// Now put " 'x'" at the end.
j := len(buf) - width
buf[j] = ' '
j++
buf[j] = '\''
j++
utf8.EncodeRune(buf[j:], rune(a))
j += runeWidth
buf[j] = '\''
}
f.pad(buf[i:])
}
// integer; interprets prec but not wid. Once formatted, result is sent to pad()
// and then flags are cleared.
func (f *fmt) integer(a int64, base uint64, signedness bool, digits string) {
// precision of 0 and value of 0 means "print nothing"
if f.precPresent && f.prec == 0 && a == 0 {
return
}
var buf []byte = f.intbuf[0:]
negative := signedness == signed && a < 0
if negative {
a = -a
}
// two ways to ask for extra leading zero digits: %.3d or %03d.
// apparently the first cancels the second.
prec := 0
if f.precPresent {
prec = f.prec
f.zero = false
} else if f.zero && f.widPresent && !f.minus && f.wid > 0 {
prec = f.wid
if negative || f.plus || f.space {
prec-- // leave room for sign
}
}
// format a into buf, ending at buf[i]. (printing is easier right-to-left.)
// a is made into unsigned ua. we could make things
// marginally faster by splitting the 32-bit case out into a separate
// block but it's not worth the duplication, so ua has 64 bits.
i := len(f.intbuf)
ua := uint64(a)
for ua >= base {
i--
buf[i] = digits[ua%base]
ua /= base
}
i--
buf[i] = digits[ua]
for i > 0 && prec > nByte-i {
i--
buf[i] = '0'
}
// Various prefixes: 0x, -, etc.
if f.sharp {
switch base {
case 8:
if buf[i] != '0' {
i--
buf[i] = '0'
}
case 16:
i--
buf[i] = 'x' + digits[10] - 'a'
i--
buf[i] = '0'
}
}
if f.unicode {
i--
buf[i] = '+'
i--
buf[i] = 'U'
}
if negative {
i--
buf[i] = '-'
} else if f.plus {
i--
buf[i] = '+'
} else if f.space {
i--
buf[i] = ' '
}
// If we want a quoted char for %#U, move the data up to make room.
if f.unicode && f.uniQuote && a >= 0 && a <= utf8.MaxRune && strconv.IsPrint(rune(a)) {
runeWidth := utf8.RuneLen(rune(a))
width := 1 + 1 + runeWidth + 1 // space, quote, rune, quote
copy(buf[i-width:], buf[i:]) // guaranteed to have enough room.
i -= width
// Now put " 'x'" at the end.
j := len(buf) - width
buf[j] = ' '
j++
buf[j] = '\''
j++
utf8.EncodeRune(buf[j:], rune(a))
j += runeWidth
buf[j] = '\''
}
f.pad(buf[i:])
}
func printMsg(msg *mangos.Message) {
if printFormat == "no" {
return
}
bw := bufio.NewWriter(os.Stdout)
switch printFormat {
case "raw":
bw.Write(msg.Body)
case "ascii":
for i := 0; i < len(msg.Body); i++ {
if strconv.IsPrint(rune(msg.Body[i])) {
bw.WriteByte(msg.Body[i])
} else {
bw.WriteByte('.')
}
}
bw.WriteString("\n")
case "quoted":
for i := 0; i < len(msg.Body); i++ {
switch msg.Body[i] {
case '\n':
bw.WriteString("\\n")
case '\r':
bw.WriteString("\\r")
case '\\':
bw.WriteString("\\\\")
case '"':
bw.WriteString("\\\"")
default:
if strconv.IsPrint(rune(msg.Body[i])) {
bw.WriteByte(msg.Body[i])
} else {
bw.WriteString(fmt.Sprintf("\\x%02x",
msg.Body[i]))
}
}
}
bw.WriteString("\n")
case "msgpack":
enc := make([]byte, 5)
switch {
case len(msg.Body) < 256:
enc = enc[:2]
enc[0] = 0xc4
enc[1] = byte(len(msg.Body))
case len(msg.Body) < 65536:
enc = enc[:3]
enc[0] = 0xc5
binary.BigEndian.PutUint16(enc[1:], uint16(len(msg.Body)))
default:
enc = enc[:5]
enc[0] = 0xc6
binary.BigEndian.PutUint32(enc[1:], uint32(len(msg.Body)))
}
bw.Write(enc)
bw.Write(msg.Body)
}
bw.Flush()
}
func quoteWith(s string, quote byte) string {
var runeTmp [utf8.UTFMax]byte
buf := make([]byte, 0, 3*len(s)/2) // Try to avoid more allocations.
buf = append(buf, quote)
for width := 0; len(s) > 0; s = s[width:] {
r := rune(s[0])
width = 1
if r >= utf8.RuneSelf {
r, width = utf8.DecodeRuneInString(s)
}
if width == 1 && r == utf8.RuneError {
buf = append(buf, `\x`...)
buf = append(buf, lowerhex[s[0]>>4])
buf = append(buf, lowerhex[s[0]&0xF])
continue
}
if r == rune(quote) {
buf = append(buf, byte(r))
buf = append(buf, byte(r))
continue
}
if r == '\\' { // always backslashed
buf = append(buf, '\\')
buf = append(buf, byte(r))
continue
}
if strconv.IsPrint(r) {
n := utf8.EncodeRune(runeTmp[:], r)
buf = append(buf, runeTmp[:n]...)
continue
}
switch r {
case '\a':
buf = append(buf, `\a`...)
case '\b':
buf = append(buf, `\b`...)
case '\f':
buf = append(buf, `\f`...)
case '\n':
buf = append(buf, `\n`...)
case '\r':
buf = append(buf, `\r`...)
case '\t':
buf = append(buf, `\t`...)
case '\v':
buf = append(buf, `\v`...)
default:
switch {
case r < ' ':
buf = append(buf, `\x`...)
buf = append(buf, lowerhex[s[0]>>4])
buf = append(buf, lowerhex[s[0]&0xF])
case r > utf8.MaxRune:
r = 0xFFFD
fallthrough
case r < 0x10000:
buf = append(buf, `\u`...)
for s := 12; s >= 0; s -= 4 {
buf = append(buf, lowerhex[r>>uint(s)&0xF])
}
default:
buf = append(buf, `\U`...)
for s := 28; s >= 0; s -= 4 {
buf = append(buf, lowerhex[r>>uint(s)&0xF])
}
}
}
}
buf = append(buf, quote)
return string(buf)
}
