mirror of https://github.com/LeOS-GSI/LeOS-Genesis
114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/**
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* @file Utf16Decoder.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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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 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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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY 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 THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef BADVPN_UTF16DECODER_H
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#define BADVPN_UTF16DECODER_H
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#include <stdint.h>
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#include <misc/debug.h>
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/**
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* Decodes UTF-16 data into Unicode characters.
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*/
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typedef struct {
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int cont;
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uint32_t ch;
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} Utf16Decoder;
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/**
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* Initializes the UTF-16 decoder.
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*
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* @param o the object
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*/
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static void Utf16Decoder_Init (Utf16Decoder *o);
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/**
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* Inputs a 16-bit value to the decoder.
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*
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* @param o the object
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* @param b 16-bit value to input
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* @param out_ch will receive a Unicode character if this function returns 1.
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* If written, the character will be in the range 0 - 0x10FFFF,
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* excluding the surrogate range 0xD800 - 0xDFFF.
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* @return 1 if a Unicode character has been written to *out_ch, 0 if not
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*/
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static int Utf16Decoder_Input (Utf16Decoder *o, uint16_t b, uint32_t *out_ch);
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void Utf16Decoder_Init (Utf16Decoder *o)
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{
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o->cont = 0;
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}
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int Utf16Decoder_Input (Utf16Decoder *o, uint16_t b, uint32_t *out_ch)
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{
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// high surrogate
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if (b >= UINT16_C(0xD800) && b <= UINT16_C(0xDBFF)) {
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// set continuation state
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o->cont = 1;
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// add high bits
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o->ch = (uint32_t)(b - UINT16_C(0xD800)) << 10;
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return 0;
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}
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// low surrogate
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if (b >= UINT16_C(0xDC00) && b <= UINT16_C(0xDFFF)) {
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// check continuation
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if (!o->cont) {
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return 0;
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}
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// add low bits
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o->ch |= (b - UINT16_C(0xDC00));
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// reset state
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o->cont = 0;
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// don't report surrogates
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if (o->ch >= UINT32_C(0xD800) && o->ch <= UINT32_C(0xDFFF)) {
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return 0;
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}
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// return character
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*out_ch = o->ch;
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return 1;
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}
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// reset state
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o->cont = 0;
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// return character
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*out_ch = b;
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return 1;
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}
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#endif
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