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jakcron
39 lines
1.5 KiB
C++
39 lines
1.5 KiB
C++
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/**
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* @file utf8.h
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* @brief Declaration of UTF-8 constants and macros
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* @author Jack (jakcron)
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* @version 0.2
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* @date 2021/01/26
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*/
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#pragma once
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#include <tc/types.h>
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namespace tc { namespace string { namespace detail {
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static const char32_t kUtf8AsciiStart = 0x00;
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static const char32_t kUtf8AsciiEnd = 0x7F;
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static const char32_t kUtf82ByteStart = 0x80;
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static const char32_t kUtf82ByteEnd = 0x7FF;
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static const char32_t kUtf83ByteStart = 0x800;
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static const char32_t kUtf83ByteEnd = 0x7FFF;
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static const char32_t kUtf84ByteStart = 0x8000;
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static const char32_t kUtf84ByteEnd = 0x10FFFF;
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static inline uint8_t make_utf8_prefix(uint8_t prefix_bits) { return ((uint8_t)(-1)) << (8 - prefix_bits); }
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static inline uint8_t make_utf8_mask(uint8_t prefix_bits) { return ((uint8_t)(-1)) >> (prefix_bits + 1); }
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static inline uint8_t make_utf8(uint8_t prefix_bits, uint8_t data) { return make_utf8_prefix(prefix_bits) | (data & make_utf8_mask(prefix_bits)); }
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static inline uint8_t get_utf8_data(uint8_t prefix_bits, uint8_t utf8_chr) { return utf8_chr & make_utf8_mask(prefix_bits); }
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static inline bool utf8_has_prefix(uint8_t prefix_bits, uint8_t utf8_chr) { return ((utf8_chr & make_utf8_prefix(prefix_bits)) == make_utf8_prefix(prefix_bits)) && ((utf8_chr & ~make_utf8_mask(prefix_bits)) == make_utf8_prefix(prefix_bits)); }
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static inline uint8_t get_utf8_prefix(uint8_t utf8_chr)
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{
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uint8_t prefix = 0;
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while ((utf8_chr & (1 << 7)) != 0)
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{
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utf8_chr <<= 1;
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prefix++;
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}
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return prefix;
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}
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}}} // namespace tc::string::detail
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