82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
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/**
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* @file Utf8Encoder.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_UTF8ENCODER_H
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#define BADVPN_UTF8ENCODER_H
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#include <stdint.h>
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/**
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* Encodes a Unicode character into a sequence of bytes according to UTF-8.
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*
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* @param ch Unicode character to encode
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* @param out will receive the encoded bytes. Must have space for 4 bytes.
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* @return number of bytes written, 0-4, with 0 meaning the character cannot
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* be encoded
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*/
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static int Utf8Encoder_EncodeCharacter (uint32_t ch, uint8_t *out);
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int Utf8Encoder_EncodeCharacter (uint32_t ch, uint8_t *out)
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{
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if (ch <= UINT32_C(0x007F)) {
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out[0] = ch;
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return 1;
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}
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if (ch <= UINT32_C(0x07FF)) {
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out[0] = (0xC0 | (ch >> 6));
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out[1] = (0x80 | ((ch >> 0) & 0x3F));
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return 2;
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}
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if (ch <= UINT32_C(0xFFFF)) {
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// surrogates
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if (ch >= UINT32_C(0xD800) && ch <= UINT32_C(0xDFFF)) {
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return 0;
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}
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out[0] = (0xE0 | (ch >> 12));
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out[1] = (0x80 | ((ch >> 6) & 0x3F));
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out[2] = (0x80 | ((ch >> 0) & 0x3F));
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return 3;
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}
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if (ch < UINT32_C(0x10FFFF)) {
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out[0] = (0xF0 | (ch >> 18));
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out[1] = (0x80 | ((ch >> 12) & 0x3F));
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out[2] = (0x80 | ((ch >> 6) & 0x3F));
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out[3] = (0x80 | ((ch >> 0) & 0x3F));
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return 4;
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}
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return 0;
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}
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#endif
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