File content as of revision 0:18ba3960b5dd:

// ArduinoJson - arduinojson.org
// Copyright Benoit Blanchon 2014-2021
// MIT License

#pragma once

#include <ArduinoJson/Namespace.hpp>

namespace ARDUINOJSON_NAMESPACE {

namespace Utf8 {
template <typename TStringBuilder>
inline void encodeCodepoint(uint32_t codepoint32, TStringBuilder& str) {
  // this function was optimize for code size on AVR

  // a buffer to store the string in reverse
  char buf[5];
  char* p = buf;

  *(p++) = 0;
  if (codepoint32 < 0x80) {
    *(p++) = char((codepoint32));
  } else {
    *(p++) = char((codepoint32 | 0x80) & 0xBF);
    uint16_t codepoint16 = uint16_t(codepoint32 >> 6);
    if (codepoint16 < 0x20) {  // 0x800
      *(p++) = char(codepoint16 | 0xC0);
    } else {
      *(p++) = char((codepoint16 | 0x80) & 0xBF);
      codepoint16 = uint16_t(codepoint16 >> 6);
      if (codepoint16 < 0x10) {  // 0x10000
        *(p++) = char(codepoint16 | 0xE0);
      } else {
        *(p++) = char((codepoint16 | 0x80) & 0xBF);
        codepoint16 = uint16_t(codepoint16 >> 6);
        *(p++) = char(codepoint16 | 0xF0);
      }
    }
  }

  while (*(--p)) {
    str.append(*p);
  }
}
}  // namespace Utf8
}  // namespace ARDUINOJSON_NAMESPACE