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1 | /* |
2 | * Copyright (c) 2009 Nicira Networks. | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | ||
19 | #include "unicode.h" | |
20 | ||
21 | /* Returns the unicode code point corresponding to leading surrogate 'leading' | |
22 | * and trailing surrogate 'trailing'. The return value will not make any | |
23 | * sense if 'leading' or 'trailing' are not in the correct ranges for leading | |
24 | * or trailing surrogates. */ | |
25 | int | |
26 | utf16_decode_surrogate_pair(int leading, int trailing) | |
27 | { | |
28 | /* | |
29 | * Leading surrogate: 110110wwwwxxxxxx | |
30 | * Trailing surrogate: 110111xxxxxxxxxx | |
31 | * Code point: 000uuuuuxxxxxxxxxxxxxxxx | |
32 | */ | |
33 | int w = (leading >> 6) & 0xf; | |
34 | int u = w + 1; | |
35 | int x0 = leading & 0x3f; | |
36 | int x1 = trailing & 0x3ff; | |
37 | return (u << 16) | (x0 << 10) | x1; | |
38 | } |