2019-12-13 04:29:58 +00:00
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/*
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2020-04-16 03:42:30 +00:00
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Copyright (c) 2006-2020 Chung, Hyung-Hwan. All rights reserved.
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2019-12-13 04:29:58 +00:00
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "hawk-prv.h"
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/* TODO: handle different endians - UTF16BE or UTF16LE */
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enum
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{
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HIGH_SURROGATE_START = 0xD800,
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HIGH_SURROGATE_END = 0xDBFF,
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LOW_SURROGATE_START = 0xDC00,
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LOW_SURROGATE_END = 0xDFFF
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};
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hawk_oow_t hawk_uc_to_utf16 (hawk_uch_t uc, hawk_bch_t* utf16, hawk_oow_t size)
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{
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hawk_uint16_t* u16 = (hawk_uint16_t*)utf16;
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2024-05-02 13:47:30 +00:00
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if (uc <= 0xFFFF)
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2019-12-13 04:29:58 +00:00
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{
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u16[0] = (hawk_uint16_t)uc;
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return 2;
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}
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#if (HAWK_SIZEOF_UCH_T > 2)
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2024-05-02 13:47:30 +00:00
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else if (uc <= 0x10FFFF)
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2019-12-13 04:29:58 +00:00
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{
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u16[0] = HIGH_SURROGATE_START | (((uc >> 16) & 0x1F) - 1) | (uc >> 10);
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u16[1] = LOW_SURROGATE_START | (uc & 0x3FF);
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return 4;
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}
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#endif
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return 0; /* illegal character */
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}
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hawk_oow_t hawk_utf16_to_uc (const hawk_bch_t* utf16, hawk_oow_t size, hawk_uch_t* uc)
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{
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const hawk_uint16_t* u16 = (const hawk_uint16_t*)utf16;
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if (size < 2) return 0; /* incomplete sequence */
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2024-05-02 13:47:30 +00:00
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if (u16[0] < HIGH_SURROGATE_START || u16[0] > LOW_SURROGATE_END)
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2019-12-13 04:29:58 +00:00
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{
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/* BMP - U+0000 - U+D7FF, U+E000 - U+FFFF */
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*uc = u16[0];
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return 2;
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}
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#if (HAWK_SIZEOF_UCH_T > 2)
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else if (u16[0] >= HIGH_SURROGATE_START && u16[0] <= HIGH_SURROGATE_END) /* high-surrogate */
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{
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if (size < 4) return 0; /* incomplete */
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if (u16[1] >= LOW_SURROGATE_START && u16[1] <= LOW_SURROGATE_END) /* low-surrogate */
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{
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*uc = (((u16[0] & 0x3FF) << 10) | (u16[1] & 0x3FF)) + 0x10000;
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return 4;
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}
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}
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#endif
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return 0;
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}
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