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defined some constants as enums in utf16.c

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This commit is contained in:
hyunghwan.chung 2018-11-15 04:26:05 +00:00
parent e48b3ce1f6
commit 324c175956
1 changed files with 13 additions and 5 deletions
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18
moo/lib/utf16.c
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@ -28,6 +28,14 @@
/* TODO: handle different endians - UTF16BE or UTF16LE */
enum
{
HIGH_SURROGATE_START = 0xD800,
HIGH_SURROGATE_END = 0xDBFF,
LOW_SURROGATE_START = 0xDC00,
LOW_SURROGATE_END = 0xDFFF
};
moo_oow_t moo_uc_to_utf16 (moo_uch_t uc, moo_bch_t* utf16, moo_oow_t size)
{
moo_uint16_t* u16 = (moo_uint16_t*)utf16;
@ -40,8 +48,8 @@ moo_oow_t moo_uc_to_utf16 (moo_uch_t uc, moo_bch_t* utf16, moo_oow_t size)
#if (MOO_SIZEOF_UCH_T > 2)
else if (uc <= 0x10FFFF)
{
u16[0] = 0xD800 | (((uc >> 16) & 0x1F) - 1) | (uc >> 10);
u16[1] = 0xDC00 | (uc & 0x3FF);
u16[0] = HIGH_SURROGATE_START | (((uc >> 16) & 0x1F) - 1) | (uc >> 10);
u16[1] = LOW_SURROGATE_START | (uc & 0x3FF);
return 4;
}
#endif
@ -55,17 +63,17 @@ moo_oow_t moo_utf16_to_uc (const moo_bch_t* utf16, moo_oow_t size, moo_uch_t* uc
if (size < 2) return 0; /* incomplete sequence */
if (u16[0] <= 0xD7FF || u16[0] >= 0xE000)
if (u16[0] < HIGH_SURROGATE_START || u16[0] > LOW_SURROGATE_END)
{
/* BMP - U+0000 - U+D7FF, U+E000 - U+FFFF */
*uc = u16[0];
return 2;
}
#if (MOO_SIZEOF_UCH_T > 2)
else if (u16[0] >= 0xD800 && u16[0] <= 0xDBFF) /* high-surrogate */
else if (u16[0] >= HIGH_SURROGATE_START && u16[0] <= HIGH_SURROGATE_END) /* high-surrogate */
{
if (size < 4) return 0; /* incomplete */
if (u16[1] >= 0xDC00 && u16[1] <= 0xDFFF) /* low-surrogate */
if (u16[1] >= LOW_SURROGATE_START && u16[1] <= LOW_SURROGATE_END) /* low-surrogate */
{
*uc = (((u16[0] & 0x3FF) << 10) | (u16[1] & 0x3FF)) + 0x10000;
return 4;