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51 lines
2.1 KiB
C++
51 lines
2.1 KiB
C++
#pragma once
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#include <stdexcept>
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#include <string>
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#include <cstdint>
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namespace fnd
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{
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class StringConv
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{
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public:
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static std::u16string ConvertChar8ToChar16(const std::string& in);
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static std::string ConvertChar16ToChar8(const std::u16string& in);
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private:
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static const char32_t kUtf16EncodeMax = 0x10FFFF;
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static const char32_t kUtf16NonNativeStart = 0x10000;
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static const char16_t kUtf16SurrogateBits = 10;
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static const char16_t kUtf16SurrogateMask = (1 << kUtf16SurrogateBits) - 1;
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static const char16_t kUtf16HighSurrogateStart = 0xD800;
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static const char16_t kUtf16HighSurrogateEnd = kUtf16HighSurrogateStart | kUtf16SurrogateMask;
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static const char16_t kUtf16LowSurrogateStart = 0xDC00;
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static const char16_t kUtf16LowSurrogateEnd = kUtf16LowSurrogateStart | kUtf16SurrogateMask;
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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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};
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}
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