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https://github.com/openvswitch/ovs
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39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
/*
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* Copyright (c) 2009 Nicira Networks.
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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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*/
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#include <config.h>
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#include "unicode.h"
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/* Returns the unicode code point corresponding to leading surrogate 'leading'
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* and trailing surrogate 'trailing'. The return value will not make any
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* sense if 'leading' or 'trailing' are not in the correct ranges for leading
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* or trailing surrogates. */
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int
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utf16_decode_surrogate_pair(int leading, int trailing)
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{
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/*
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* Leading surrogate: 110110wwwwxxxxxx
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* Trailing surrogate: 110111xxxxxxxxxx
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* Code point: 000uuuuuxxxxxxxxxxxxxxxx
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*/
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int w = (leading >> 6) & 0xf;
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int u = w + 1;
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int x0 = leading & 0x3f;
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int x1 = trailing & 0x3ff;
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return (u << 16) | (x0 << 10) | x1;
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}
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