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63 lines
1.1 KiB
63 lines
1.1 KiB
package sip
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import (
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"bytes"
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)
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const (
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hexChars = "0123456789abcdef"
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)
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// tokencify removes all characters that aren't tokenc.
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func tokencify(s []byte) []byte {
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t := make([]byte, len(s))
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j := 0
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l := 0
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for i := 0; i < len(s); i++ {
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if tokenc(s[i]) {
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t[j] = s[i]
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j++
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l++
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}
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}
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return t[:l]
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}
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// quote formats an address parameter value or display name.
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//
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// Quotation marks are only added if necessary. This implementation will
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// truncate on input error.
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func quote(s []byte) []byte {
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for i := 0; i < len(s); i++ {
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if !tokenc(s[i]) && s[i] != ' ' {
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return quoteQuoted(s)
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}
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}
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return s
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}
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// quoteQuoted formats an address parameter value or display name with quotes.
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//
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// This implementation will truncate on input error.
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func quoteQuoted(s []byte) []byte {
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var b bytes.Buffer
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b.WriteByte('"')
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for i := 0; i < len(s); i++ {
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if qdtextc(s[i]) {
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if s[i] == '\r' {
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if i+2 >= len(s) || s[i+1] != '\n' ||
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!(s[i+2] == ' ' || s[i+2] == '\t') {
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break
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}
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}
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} else {
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if !qdtextesc(s[i]) {
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break
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}
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b.WriteByte('\\')
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}
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b.WriteByte(s[i])
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}
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b.WriteByte('"')
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return b.Bytes()
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}
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