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limited the utf8 ranges

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hyung-hwan 2022-01-07 02:04:46 +00:00
parent d3a04da539
commit 1e87355c4c
1 changed files with 13 additions and 1 deletions
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14
qse/lib/cmn/utf8.c
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@ -26,6 +26,8 @@
#include <qse/cmn/utf8.h>
/*#define RETAIN_RFC2279 1*/
/*
* from RFC 2279 UTF-8, a transformation format of ISO 10646
*
@ -36,6 +38,12 @@
* 4:4 00010000-001FFFFF 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
* inv 00200000-03FFFFFF 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
* inv 04000000-7FFFFFFF 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
*
* RFC3629 limits the ranges like this:
* 1:2 00000000-0000007F 0xxxxxxx
* 2:2 00000080-000007FF 110xxxxx 10xxxxxx
* 3:2 00000800-0000FFFF 1110xxxx 10xxxxxx 10xxxxxx
* 4:4 00010000-0010FFFF 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
*/
struct __utf8_t
@ -55,9 +63,13 @@ static __utf8_t utf8_table[] =
{0x00000000ul, 0x0000007Ful, 0x00, 0x80, 0x7F, 1},
{0x00000080ul, 0x000007FFul, 0xC0, 0xE0, 0x1F, 2},
{0x00000800ul, 0x0000FFFFul, 0xE0, 0xF0, 0x0F, 3},
#if defined(RETAIN_RFC2279)
{0x00010000ul, 0x001FFFFFul, 0xF0, 0xF8, 0x07, 4},
{0x00200000ul, 0x03FFFFFFul, 0xF8, 0xFC, 0x03, 5},
{0x04000000ul, 0x7FFFFFFFul, 0xFC, 0xFE, 0x01, 6}
#else
{0x00010000ul, 0x0010FFFFul, 0xF0, 0xF8, 0x07, 4}
#endif
};
static QSE_INLINE __utf8_t* get_utf8_slot (qse_wchar_t uc)
@ -88,7 +100,7 @@ static QSE_INLINE __utf8_t* get_utf8_slot (qse_wchar_t uc)
qse_size_t qse_uctoutf8 (qse_wchar_t uc, qse_mchar_t* utf8, qse_size_t size)
{
__utf8_t* cur = get_utf8_slot (uc);
__utf8_t* cur = get_utf8_slot(uc);
if (cur == QSE_NULL) return 0; /* illegal character */