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49 lines
947 B
49 lines
947 B
package sip
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// escapeUser escapes a URI user, which can't use quoting.
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func escapeUser(s []byte) []byte {
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return escape(s, userc)
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}
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// escapePass escapes a URI password, which can't use quoting.
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func escapePass(s []byte) []byte {
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return escape(s, passc)
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}
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// escapeParam escapes a URI parameter, which can't use quoting.
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func escapeParam(s []byte) []byte {
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return escape(s, paramc)
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}
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// escapeHeader escapes a URI header, which can't use quoting.
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func escapeHeader(s []byte) []byte {
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return escape(s, headerc)
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}
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// escape provides arbitrary URI escaping.
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func escape(s []byte, p func(byte) bool) []byte {
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hc := 0
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for i := 0; i < len(s); i++ {
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if !p(s[i]) {
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hc++
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}
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}
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if hc == 0 {
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return s
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}
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res := make([]byte, len(s)+2*hc)
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j := 0
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for i := 0; i < len(s); i++ {
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c := s[i]
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if p(c) {
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res[j] = c
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j++
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} else {
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res[j] = '%'
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res[j+1] = hexChars[c>>4]
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res[j+2] = hexChars[c%16]
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j += 3
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}
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}
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return res
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}
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