Method codepoint

src/cpp/encoding/Encodings.cpp:368–406

}

char32_t cpp::encoding::Utf8::codepoint(const cpp::marshal::View<uint8_t>& buffer)
{
    auto b0 = static_cast<char32_t>(buffer[0]);

    if ((b0 & 0x80) == 0)
    {
        return b0;
    }
    else if ((b0 & 0xE0) == 0xC0)
    {
        return (static_cast<char32_t>(b0 & 0x1F) << 6) | static_cast<char32_t>(buffer.slice(1)[0] & 0x3F);
    }
    else if ((b0 & 0xF0) == 0xE0)
    {
        auto staging = std::array<uint8_t, 2>();
        auto dst     = View<uint8_t>(staging.data(), staging.size());

        buffer.slice(1, staging.size()).copyTo(dst);

        return (static_cast<char32_t>(b0 & 0x0F) << 12) | (static_cast<char32_t>(staging[0] & 0x3F) << 6) | static_cast<char32_t>(staging[1] & 0x3F);
    }
    else if ((b0 & 0xF8) == 0xF0)
    {
        auto staging = std::array<uint8_t, 3>();
        auto dst     = View<uint8_t>(staging.data(), staging.size());

        buffer.slice(1, staging.size()).copyTo(dst);

        return
            (static_cast<char32_t>(b0 & 0x07) << 18) |
            (static_cast<char32_t>(staging[0] & 0x3F) << 12) |
            (static_cast<char32_t>(staging[1] & 0x3F) << 6) |
            static_cast<char32_t>(staging[2] & 0x3F);
    }
    else
    {
        return int{ hx::Throw(HX_CSTRING("Failed to read codepoint")) };
    }
}

namespace
{