// Copyright 2020 Justine Alexandra Roberts Tunney
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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// appendEscaped appends while URL encoding bytes that don't match the predicate..
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func appendEscaped(b *bytes.Buffer, s []byte, p func(byte) bool) {
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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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b.WriteByte(c)
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} else {
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b.WriteByte('%')
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b.WriteByte(hexChars[c>>4])
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b.WriteByte(hexChars[c%16])
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}
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}
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}
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