84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
|
|
Copyright (c) 2006-2020 Chung, Hyung-Hwan. All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
1. Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
2. Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
|
|
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "hawk-prv.h"
|
|
|
|
/* TODO: handle different endians - UTF16BE or UTF16LE */
|
|
|
|
enum
|
|
{
|
|
HIGH_SURROGATE_START = 0xD800,
|
|
HIGH_SURROGATE_END = 0xDBFF,
|
|
LOW_SURROGATE_START = 0xDC00,
|
|
LOW_SURROGATE_END = 0xDFFF
|
|
};
|
|
|
|
hawk_oow_t hawk_uc_to_utf16 (hawk_uch_t uc, hawk_bch_t* utf16, hawk_oow_t size)
|
|
{
|
|
hawk_uint16_t* u16 = (hawk_uint16_t*)utf16;
|
|
|
|
if (uc <= 0xFFFF)
|
|
{
|
|
u16[0] = (hawk_uint16_t)uc;
|
|
return 2;
|
|
}
|
|
#if (HAWK_SIZEOF_UCH_T > 2)
|
|
else if (uc <= 0x10FFFF)
|
|
{
|
|
u16[0] = HIGH_SURROGATE_START | (((uc >> 16) & 0x1F) - 1) | (uc >> 10);
|
|
u16[1] = LOW_SURROGATE_START | (uc & 0x3FF);
|
|
return 4;
|
|
}
|
|
#endif
|
|
|
|
return 0; /* illegal character */
|
|
}
|
|
|
|
hawk_oow_t hawk_utf16_to_uc (const hawk_bch_t* utf16, hawk_oow_t size, hawk_uch_t* uc)
|
|
{
|
|
const hawk_uint16_t* u16 = (const hawk_uint16_t*)utf16;
|
|
|
|
if (size < 2) return 0; /* incomplete sequence */
|
|
|
|
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 (HAWK_SIZEOF_UCH_T > 2)
|
|
else if (u16[0] >= HIGH_SURROGATE_START && u16[0] <= HIGH_SURROGATE_END) /* high-surrogate */
|
|
{
|
|
if (size < 4) return 0; /* incomplete */
|
|
if (u16[1] >= LOW_SURROGATE_START && u16[1] <= LOW_SURROGATE_END) /* low-surrogate */
|
|
{
|
|
*uc = (((u16[0] & 0x3FF) << 10) | (u16[1] & 0x3FF)) + 0x10000;
|
|
return 4;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|