SimpleNoter/utf8_encode.cpp at main · Magnetic-Fox/SimpleNoter · GitHub

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#include "utf8_encode.hpp"

/**

* Encode a code point using UTF-8

* @author Ondøej Hruška <ondra@ondrovo.com>

* @license MIT

* @param out - output buffer (min 5 characters), will be 0-terminated

* @param utf - code point 0-0x10FFFF

* @return number of bytes on success, 0 on failure (also produces U+FFFD, which uses 3 bytes)

int utf8_encode(char *out, uint32_t utf)

{

if (utf <= 0x7F) {

// Plain ASCII

out[0] = (char) utf;

out[1] = 0;

return 1;

}

else if (utf <= 0x07FF) {

// 2-byte unicode

out[0] = (char) (((utf >> 6) & 0x1F) | 0xC0);

out[1] = (char) (((utf >> 0) & 0x3F) | 0x80);

out[2] = 0;

return 2;

}

else if (utf <= 0xFFFF) {

// 3-byte unicode

out[0] = (char) (((utf >> 12) & 0x0F) | 0xE0);

out[1] = (char) (((utf >> 6) & 0x3F) | 0x80);

out[2] = (char) (((utf >> 0) & 0x3F) | 0x80);

out[3] = 0;

return 3;

}

else if (utf <= 0x10FFFF) {

// 4-byte unicode

out[0] = (char) (((utf >> 18) & 0x07) | 0xF0);

out[1] = (char) (((utf >> 12) & 0x3F) | 0x80);

out[2] = (char) (((utf >> 6) & 0x3F) | 0x80);

out[3] = (char) (((utf >> 0) & 0x3F) | 0x80);

out[4] = 0;

return 4;

}

else {

// error - use replacement character

out[0] = (char) 0xEF;

out[1] = (char) 0xBF;

out[2] = (char) 0xBD;

out[3] = 0;

return 0;

}

SimpleNoter/utf8_encode.cpp at main · Magnetic-Fox/SimpleNoter · GitHub

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