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27 lines
819 B
27 lines
819 B
// 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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func unhex(b byte) byte {
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switch {
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case '0' <= b && b <= '9':
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return b - '0'
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case 'a' <= b && b <= 'f':
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return b - 'a' + 10
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case 'A' <= b && b <= 'F':
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return b - 'A' + 10
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}
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return 0
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}
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