Function EscapeString

Libs/flatbuffers/util.h:589–657

#endif  // !FLATBUFFERS_PREFER_PRINTF

inline bool EscapeString(const char *s, size_t length, std::string *_text,
                         bool allow_non_utf8, bool natural_utf8) {
  std::string &text = *_text;
  text += "\"";
  for (uoffset_t i = 0; i < length; i++) {
    char c = s[i];
    switch (c) {
      case '\n': text += "\\n"; break;
      case '\t': text += "\\t"; break;
      case '\r': text += "\\r"; break;
      case '\b': text += "\\b"; break;
      case '\f': text += "\\f"; break;
      case '\"': text += "\\\""; break;
      case '\\': text += "\\\\"; break;
      default:
        if (c >= ' ' && c <= '~') {
          text += c;
        } else {
          // Not printable ASCII data. Let's see if it's valid UTF-8 first:
          const char *utf8 = s + i;
          int ucc = FromUTF8(&utf8);
          if (ucc < 0) {
            if (allow_non_utf8) {
              text += "\\x";
              text += IntToStringHex(static_cast<uint8_t>(c), 2);
            } else {
              // There are two cases here:
              //
              // 1) We reached here by parsing an IDL file. In that case,
              // we previously checked for non-UTF-8, so we shouldn't reach
              // here.
              //
              // 2) We reached here by someone calling GenerateText()
              // on a previously-serialized flatbuffer. The data might have
              // non-UTF-8 Strings, or might be corrupt.
              //
              // In both cases, we have to give up and inform the caller
              // they have no JSON.
              return false;
            }
          } else {
            if (natural_utf8) {
              // utf8 points to past all utf-8 bytes parsed
              text.append(s + i, static_cast<size_t>(utf8 - s - i));
            } else if (ucc <= 0xFFFF) {
              // Parses as Unicode within JSON's \uXXXX range, so use that.
              text += "\\u";
              text += IntToStringHex(ucc, 4);
            } else if (ucc <= 0x10FFFF) {
              // Encode Unicode SMP values to a surrogate pair using two \u
              // escapes.
              uint32_t base = ucc - 0x10000;
              auto high_surrogate = (base >> 10) + 0xD800;
              auto low_surrogate = (base & 0x03FF) + 0xDC00;
              text += "\\u";
              text += IntToStringHex(high_surrogate, 4);
              text += "\\u";
              text += IntToStringHex(low_surrogate, 4);