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ICU-1129 implement macros to get surrogate values

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X-SVN-Rev: 5728
This commit is contained in:
Markus Scherer 2001-09-11 01:27:34 +00:00
parent ab88ec67e6
commit a3c3b270f4
1 changed files with 21 additions and 0 deletions
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21
icu4c/source/common/unicode/utf16.h
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@ -46,6 +46,27 @@
#define UTF16_GET_PAIR_VALUE(first, second) \
(((first)<<10UL)+(second)-UTF_SURROGATE_OFFSET)
/* get the first and second surrogates for a supplementary code point */
/**
* Takes a supplementary code point (0x10000..0x10ffff)
* and computes the first surrogate (0xd800..0xdbff)
* for UTF-16 encoding.
*/
#define UTF_FIRST_SURROGATE(supplementary) (UChar)(((supplementary)>>10)+0xd7c0)
/**
* Takes a supplementary code point (0x10000..0x10ffff)
* and computes the second surrogate (0xdc00..0xdfff)
* for UTF-16 encoding.
*/
#define UTF_SECOND_SURROGATE(supplementary) (UChar)(((supplementary)&0x3ff)|0xdc00)
/** alias for UTF_FIRST_SURROGATE */
#define UTF16_LEAD(supplementary) UTF_FIRST_SURROGATE(supplementary)
/** alias for UTF_SECOND_SURROGATE */
#define UTF16_TRAIL(supplementary) UTF_SECOND_SURROGATE(supplementary)
/* classes of code unit values */
#define UTF16_IS_SINGLE(uchar) !UTF_IS_SURROGATE(uchar)
#define UTF16_IS_LEAD(uchar) UTF_IS_FIRST_SURROGATE(uchar)