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80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*
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Copyright (c) 2018 MariaDB Corporation
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _CTYPE_UTF16_H
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#define _CTYPE_UTF16_H
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/*
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D800..DB7F - Non-provate surrogate high (896 pages)
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DB80..DBFF - Private surrogate high (128 pages)
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DC00..DFFF - Surrogate low (1024 codes in a page)
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*/
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#define MY_UTF16_SURROGATE_HIGH_FIRST 0xD800
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#define MY_UTF16_SURROGATE_HIGH_LAST 0xDBFF
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#define MY_UTF16_SURROGATE_LOW_FIRST 0xDC00
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#define MY_UTF16_SURROGATE_LOW_LAST 0xDFFF
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#define MY_UTF16_HIGH_HEAD(x) ((((uchar) (x)) & 0xFC) == 0xD8)
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#define MY_UTF16_LOW_HEAD(x) ((((uchar) (x)) & 0xFC) == 0xDC)
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/* Test if a byte is a leading byte of a high or low surrogate head: */
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#define MY_UTF16_SURROGATE_HEAD(x) ((((uchar) (x)) & 0xF8) == 0xD8)
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/* Test if a Unicode code point is a high or low surrogate head */
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#define MY_UTF16_SURROGATE(x) (((x) & 0xF800) == 0xD800)
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#define MY_UTF16_WC2(a, b) ((a << 8) + b)
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/*
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a= 110110?? (<< 18)
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b= ???????? (<< 10)
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c= 110111?? (<< 8)
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d= ???????? (<< 0)
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*/
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#define MY_UTF16_WC4(a, b, c, d) (((a & 3) << 18) + (b << 10) + \
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((c & 3) << 8) + d + 0x10000)
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static inline int
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my_mb_wc_utf16_quick(my_wc_t *pwc, const uchar *s, const uchar *e)
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{
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if (s + 2 > e)
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return MY_CS_TOOSMALL2;
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/*
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High bytes: 0xD[89AB] = B'110110??'
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Low bytes: 0xD[CDEF] = B'110111??'
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Surrogate mask: 0xFC = B'11111100'
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*/
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if (MY_UTF16_HIGH_HEAD(*s)) /* Surrogate head */
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{
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if (s + 4 > e)
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return MY_CS_TOOSMALL4;
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if (!MY_UTF16_LOW_HEAD(s[2])) /* Broken surrigate pair */
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return MY_CS_ILSEQ;
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*pwc= MY_UTF16_WC4(s[0], s[1], s[2], s[3]);
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return 4;
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}
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if (MY_UTF16_LOW_HEAD(*s)) /* Low surrogate part without high part */
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return MY_CS_ILSEQ;
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*pwc= MY_UTF16_WC2(s[0], s[1]);
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return 2;
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}
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#endif /* _CTYPE_UTF16_H */
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