53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
/**
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* \file utf8.cc
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* \brief Implementation for UTF-8 related functions
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*/
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#include "utf8.hh"
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#include <string>
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using FILE = std::FILE;
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using uint8_t = std::uint8_t;
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using uint32_t = std::uint32_t;
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using ustring = std::basic_string<uint8_t>; // chaine non encodée
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/**
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* Les caractères \c passés en argument sont écrit dans le fichier de sortie au
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* format UTF-8
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*
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* \param[in] out Fichier de sortie
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* \param[in] c Caractères à écrire dans \p out
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*/
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void write_utf8(FILE* t_out, uint32_t t_c) {
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if(t_c < 128) {
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fwrite(&t_c, sizeof(unsigned char), 1, t_out);
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return;
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}
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size_t loops = 0;
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unsigned char header = 0;
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if (t_c < 2048) {
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loops = 1;
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header = 0xC0;
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} else if (t_c < 65536) {
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loops = 2;
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header = 0xE0;
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} else if (t_c < 2097152) {
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loops = 3;
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header = 0xF0;
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} else if (t_c < 67108864) {
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loops = 4;
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header = 0xF8;
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} else {
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loops = 5;
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header = 0xFC;
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}
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ustring str(loops + 1, 0);
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for (size_t i = 0; i <= loops; ++i) {
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str[i] = static_cast<unsigned char>(
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((t_c & ((i == loops) ? 0x3F : 0xFF)) >> ((loops - i) * 6)) +
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((i == 0) ? header : 0x80));
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}
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fwrite(str.data(), sizeof(unsigned char), str.size(), t_out);
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}
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