9.1.2 utf-8 encoder 
@constructor
@implements {Encoder}
@param {{fatal: boolean}} options
519926
function UTF8Encoder(options) {
    var fatal = options.fatal;
    /**
     * @param {Stream} stream Input stream.
     * @param {number} code_point Next code point read from the stream.
     * @return {(number|!Array.<number>)} Byte(s) to emit.
     */
    this.handler = function(stream, code_point) {
      // 1. If code point is end-of-stream, return finished.
      if (code_point === end_of_stream)
        return finished;

      // 2. If code point is in the range U+0000 to U+007F, return a
      // byte whose value is code point.
      if (inRange(code_point, 0x0000, 0x007f))
        return code_point;

      // 3. Set count and offset based on the range code point is in:
      var count, offset;
      // U+0080 to U+07FF, inclusive:
      if (inRange(code_point, 0x0080, 0x07FF)) {
        // 1 and 0xC0
        count = 1;
        offset = 0xC0;
      }
      // U+0800 to U+FFFF, inclusive:
      else if (inRange(code_point, 0x0800, 0xFFFF)) {
        // 2 and 0xE0
        count = 2;
        offset = 0xE0;
      }
      // U+10000 to U+10FFFF, inclusive:
      else if (inRange(code_point, 0x10000, 0x10FFFF)) {
        // 3 and 0xF0
        count = 3;
        offset = 0xF0;
      }

      // 4.Let bytes be a byte sequence whose first byte is (code
      // point >> (6 × count)) + offset.
      var bytes = [(code_point >> (6 * count)) + offset];

      // 5. Run these substeps while count is greater than 0:
      while (count > 0) {

        // 1. Set temp to code point >> (6 × (count − 1)).
        var temp = code_point >> (6 * (count - 1));

        // 2. Append to bytes 0x80 | (temp & 0x3F).
        bytes.push(0x80 | (temp & 0x3F));

        // 3. Decrease count by one.
        count -= 1;
      }

      // 6. Return bytes bytes, in order.
      return bytes;
    };
  }
969344
function encodeBool(value) {
    let buffer = new ByteBuffer();
    if (value === null) {
        return buffer;
    }
    if (typeof value === 'string') {
        return buffer.writeVarint32(value.toLowerCase() === 'false' ? 0 : Boolean(value));
    }
    return buffer.writeVarint32(value ? 1 : 0);
}
1336319
function(value) {
      var s = '';
      var i = 1;
      var len = value.length - 1;
      var c, c2, hex, n, index, length;

      while (i < len) {
        c = value.charAt(i++);

        if (c === '\\') {
          if (i < len) {
            c2 = value.charCodeAt(i);
            if (isLineTerminator(c2)) {
              i++;
              if (c2 === 0x0D && i < len && value.charCodeAt(i) === 0x0A) {
                i++;
              }
              continue;
            }
          }

          c = value.charAt(i++);
          switch (c) {
            case 'b':
              c = '\b';
              break;
            case 't':
              c = '\t';
              break;
            case 'r':
              c = '\r';
              break;
            case 'n':
              c = '\n';
              break;
            case 'v':
              c = '\x0B';
              break;
            case 'f':
              c = '\f';
              break;
            case 'u':
            case 'x':
              if (c === 'u' && i < len && value.charAt(i) === '{') {
                i++;
                index = value.indexOf('}', i);
                if (!~index) {
                  this.unexpected();
                }
                hex = value.substring(i, index);
                i = index + 1;
              } else {
                length = c === 'u' ? 4 : 2;
                hex = value.substr(i, length);
                i += length;
              }
              c = fromCodePoint(parseInt(hex, 16));
              break;
            default:
              if (isOctalDigit(c)) {
                n = c;
                do {
                  c = value.charAt(i);
                  if (!isOctalDigit(c)) {
                    break;
                  }
                  n += c;
                } while (i++ < len && n.length < 3);

                if (n.length > 0 && n.charAt(0) === '0') {
                  n = n.substring(1);
                }
                c = fromCharCode(parseInt(n, 8));
              }
          }
        }
        s += c;
      }

      return s;
    }
436343
function IconvHtmlStream(options) {
    this.buff = new Buffer([]);
    this.isBuffering = true;
    this.conv = null;
    options = options || {};
    this.rewrite = (options.rewrite !== false);
    this.inputEncoding = 'utf8';
    this.encoding = options.encoding = 'utf8'; // this is the *output* encoding
    this.conv = iconv.getEncoder(this.inputEncoding);
    Transform.call(this, options);
}
973952
function Parser(options) {
  this.options = merge({}, {
    headers: {
      included: false,
      downcase: true,
      upcase: true
    },
    delimiter: 'tab',
    decimalSign: 'comma'
  }, options);
}
856406
function EUCKREncoder(options) {
    var fatal = options.fatal;
    /**
     * @param {Stream} stream Input stream.
     * @param {number} code_point Next code point read from the stream.
     * @return {(number|!Array.<number>)} Byte(s) to emit.
     */
    this.handler = function(stream, code_point) {
      // 1. If code point is end-of-stream, return finished.
      if (code_point === end_of_stream)
        return finished;

      // 2. If code point is an ASCII code point, return a byte whose
      // value is code point.
      if (isASCIICodePoint(code_point))
        return code_point;

      // 3. Let pointer be the index pointer for code point in index
      // euc-kr.
      var pointer = indexPointerFor(code_point, index('euc-kr'));

      // 4. If pointer is null, return error with code point.
      if (pointer === null)
        return encoderError(code_point);

      // 5. Let lead be floor(pointer / 190) + 0x81.
      var lead = floor(pointer / 190) + 0x81;

      // 6. Let trail be pointer % 190 + 0x41.
      var trail = (pointer % 190) + 0x41;

      // 7. Return two bytes whose values are lead and trail.
      return [lead, trail];
    };
  }
890352
function json (options) {
  var opts = options || {}

  var limit = typeof opts.limit !== 'number'
    ? bytes.parse(opts.limit || '100kb')
    : opts.limit
  var inflate = opts.inflate !== false
  var reviver = opts.reviver
  var strict = opts.strict !== false
  var type = opts.type || 'application/json'
  var verify = opts.verify || false

  if (verify !== false && typeof verify !== 'function') {
    throw new TypeError('option verify must be function')
  }

  // create the appropriate type checking function
  var shouldParse = typeof type !== 'function'
    ? typeChecker(type)
    : type

  function parse (body) {
    if (body.length === 0) {
      // special-case empty json body, as it's a common client-side mistake
      // TODO: maybe make this configurable or part of "strict" option
      return {}
    }

    if (strict) {
      var first = firstchar(body)

      if (first !== '{' && first !== '[') {
        debug('strict violation')
        throw new SyntaxError('Unexpected token ' + first)
      }
    }

    debug('parse json')
    return JSON.parse(body, reviver)
  }

  return function jsonParser (req, res, next) {
    if (req._body) {
      debug('body already parsed')
      next()
      return
    }

    req.body = req.body || {}

    // skip requests without bodies
    if (!typeis.hasBody(req)) {
      debug('skip empty body')
      next()
      return
    }

    debug('content-type %j', req.headers['content-type'])

    // determine if request should be parsed
    if (!shouldParse(req)) {
      debug('skip parsing')
      next()
      return
    }

    // assert charset per RFC 7159 sec 8.1
    var charset = getCharset(req) || 'utf-8'
    if (charset.substr(0, 4) !== 'utf-') {
      debug('invalid charset')
      next(createError(415, 'unsupported charset "' + charset.toUpperCase() + '"', {
        charset: charset
      }))
      return
    }

    // read
    read(req, res, next, parse, debug, {
      encoding: charset,
      inflate: inflate,
      limit: limit,
      verify: verify
    })
  }
}
966366
function UTF16Encoder(utf16_be, options) {
    var fatal = options.fatal;
    /**
     * @param {Stream} stream Input stream.
     * @param {number} code_point Next code point read from the stream.
     * @return {(number|!Array.<number>)} Byte(s) to emit.
     */
    this.handler = function(stream, code_point) {
      // 1. If code point is end-of-stream, return finished.
      if (code_point === end_of_stream)
        return finished;

      // 2. If code point is in the range U+0000 to U+FFFF, return the
      // sequence resulting of converting code point to bytes using
      // utf-16be encoder flag.
      if (inRange(code_point, 0x0000, 0xFFFF))
        return convertCodeUnitToBytes(code_point, utf16_be);

      // 3. Let lead be ((code point − 0x10000) >> 10) + 0xD800,
      // converted to bytes using utf-16be encoder flag.
      var lead = convertCodeUnitToBytes(
        ((code_point - 0x10000) >> 10) + 0xD800, utf16_be);

      // 4. Let trail be ((code point − 0x10000) & 0x3FF) + 0xDC00,
      // converted to bytes using utf-16be encoder flag.
      var trail = convertCodeUnitToBytes(
        ((code_point - 0x10000) & 0x3FF) + 0xDC00, utf16_be);

      // 5. Return a byte sequence of lead followed by trail.
      return lead.concat(trail);
    };
  }
1137167
function EUCKRDecoder(options) {
  var fatal = options.fatal;
  var /** @type {number} */ euckr_lead = 0x00;
  /**
   * @param {ByteInputStream} byte_pointer The byte stream to decode.
   * @return {?number} The next code point decoded, or null if not enough
   *     data exists in the input stream to decode a complete code point.
   */
  this.decode = function(byte_pointer) {
    var bite = byte_pointer.get();
    if (bite === EOF_byte && euckr_lead === 0) {
      return EOF_code_point;
    }
    if (bite === EOF_byte && euckr_lead !== 0) {
      euckr_lead = 0x00;
      return decoderError(fatal);
    }
    byte_pointer.offset(1);
    if (euckr_lead !== 0x00) {
      var lead = euckr_lead;
      var pointer = null;
      euckr_lead = 0x00;

      if (inRange(lead, 0x81, 0xC6)) {
        var temp = (26 + 26 + 126) * (lead - 0x81);
        if (inRange(bite, 0x41, 0x5A)) {
          pointer = temp + bite - 0x41;
        } else if (inRange(bite, 0x61, 0x7A)) {
          pointer = temp + 26 + bite - 0x61;
        } else if (inRange(bite, 0x81, 0xFE)) {
          pointer = temp + 26 + 26 + bite - 0x81;
        }
      }

      if (inRange(lead, 0xC7, 0xFD) && inRange(bite, 0xA1, 0xFE)) {
        pointer = (26 + 26 + 126) * (0xC7 - 0x81) + (lead - 0xC7) * 94 +
            (bite - 0xA1);
      }

      var code_point = (pointer === null) ? null :
          indexCodePointFor(pointer, indexes['euc-kr']);
      if (pointer === null) {
        byte_pointer.offset(-1);
      }
      if (code_point === null) {
        return decoderError(fatal);
      }
      return code_point;
    }

    if (inRange(bite, 0x00, 0x7F)) {
      return bite;
    }

    if (inRange(bite, 0x81, 0xFD)) {
      euckr_lead = bite;
      return null;
    }

    return decoderError(fatal);
  };
}
1028047
function encode (n) {
  var o = ''
  var i = 0
  var i1, i2, i3, e1, e2, e3, e4
  n = utf8Encode(n)
  while (i < n.length) {
    i1 = n.charCodeAt(i++)
    i2 = n.charCodeAt(i++)
    i3 = n.charCodeAt(i++)
    e1 = (i1 >> 2)
    e2 = (((i1 & 3) << 4) | (i2 >> 4))
    e3 = (isNaN(i2) ? 64 : ((i2 & 15) << 2) | (i3 >> 6))
    e4 = (isNaN(i2) || isNaN(i3)) ? 64 : i3 & 63
    o = o + m.charAt(e1) + m.charAt(e2) + m.charAt(e3) + m.charAt(e4)
  }
  return o
}
805133
function encodeString(string) {
	//it actually accepts any kind of object as input
	if (string === null) {
		return values.NULL;
	} else if (string === "") {
		return values.EMPTY;
	} else {//0 false undefined NaN will pass from here
		return encodeURIComponent(string)
		.replace(/%20/g, "+");
	}
}
1177909
function charCodesToString(charCodes) {
  // Use these methods to be able to convert large strings
  if (hasProperty('Buffer')) {
    return Buffer.from(charCodes).toString(STR_ENCODING)
  } else if (hasProperty('TextDecoder')) {
    return new TextDecoder(STR_ENCODING) // eslint-disable-line no-undef
      .decode(new Int8Array(charCodes))
  }

  // Fallback method
  let str = ''

  for (let i = 0; i < charCodes.length; i += STR_SLICE_SIZE) {
    str += String.fromCharCode.apply(
      null,
      charCodes.slice(i, i + STR_SLICE_SIZE)
    )
  }

  return str
}
891496
function encodeEntities(value) {
    return value.replace(/&/g, '&amp;')
        .replace(SURROGATE_PAIR_REGEXP, function (match) {
        var /** @type {?} */ hi = match.charCodeAt(0);
        var /** @type {?} */ low = match.charCodeAt(1);
        return '&#' + (((hi - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000) + ';';
    })
        .replace(NON_ALPHANUMERIC_REGEXP, function (match) { return '&#' + match.charCodeAt(0) + ';'; })
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;');
}
622422
function urlencoded (options) {
  var opts = options || {}

  // notice because option default will flip in next major
  if (opts.extended === undefined) {
    deprecate('undefined extended: provide extended option')
  }

  var extended = opts.extended !== false
  var inflate = opts.inflate !== false
  var limit = typeof opts.limit !== 'number'
    ? bytes.parse(opts.limit || '100kb')
    : opts.limit
  var type = opts.type || 'application/x-www-form-urlencoded'
  var verify = opts.verify || false

  if (verify !== false && typeof verify !== 'function') {
    throw new TypeError('option verify must be function')
  }

  // create the appropriate query parser
  var queryparse = extended
    ? extendedparser(opts)
    : simpleparser(opts)

  // create the appropriate type checking function
  var shouldParse = typeof type !== 'function'
    ? typeChecker(type)
    : type

  function parse (body) {
    return body.length
      ? queryparse(body)
      : {}
  }

  return function urlencodedParser (req, res, next) {
    if (req._body) {
      debug('body already parsed')
      next()
      return
    }

    req.body = req.body || {}

    // skip requests without bodies
    if (!typeis.hasBody(req)) {
      debug('skip empty body')
      next()
      return
    }

    debug('content-type %j', req.headers['content-type'])

    // determine if request should be parsed
    if (!shouldParse(req)) {
      debug('skip parsing')
      next()
      return
    }

    // assert charset
    var charset = getCharset(req) || 'utf-8'
    if (charset !== 'utf-8') {
      debug('invalid charset')
      next(createError(415, 'unsupported charset "' + charset.toUpperCase() + '"', {
        charset: charset
      }))
      return
    }

    // read
    read(req, res, next, parse, debug, {
      debug: debug,
      encoding: charset,
      inflate: inflate,
      limit: limit,
      verify: verify
    })
  }
}
1020231
function(data, encoding) {
      if (encoding == null) {
        encoding = 'hex';
      }
      if (Array.isArray(data)) {
        return data;
      }
      switch (encoding) {
        case 'base64':
          return Gibberish.base64.decode(data);
        case 'hex':
          return Gibberish.h2a(data);
        case 'utf8':
          return Gibberish.s2a(data);
        default:
          throw new Error("Encoding not supported");
      }
    }
411946
function EUCKRDecoder(options) {
    var fatal = options.fatal;

    // euc-kr's decoder has an associated euc-kr lead (initially 0x00).
    var /** @type {number} */ euckr_lead = 0x00;
    /**
     * @param {Stream} stream The stream of bytes being decoded.
     * @param {number} bite The next byte read from the stream.
     * @return {?(number|!Array.<number>)} The next code point(s)
     *     decoded, or null if not enough data exists in the input
     *     stream to decode a complete code point.
     */
    this.handler = function(stream, bite) {
      // 1. If byte is end-of-stream and euc-kr lead is not 0x00, set
      // euc-kr lead to 0x00 and return error.
      if (bite === end_of_stream && euckr_lead !== 0) {
        euckr_lead = 0x00;
        return decoderError(fatal);
      }

      // 2. If byte is end-of-stream and euc-kr lead is 0x00, return
      // finished.
      if (bite === end_of_stream && euckr_lead === 0)
        return finished;

      // 3. If euc-kr lead is not 0x00, let lead be euc-kr lead, let
      // pointer be null, set euc-kr lead to 0x00, and then run these
      // substeps:
      if (euckr_lead !== 0x00) {
        var lead = euckr_lead;
        var pointer = null;
        euckr_lead = 0x00;

        // 1. If byte is in the range 0x41 to 0xFE, set pointer to
        // (lead − 0x81) × 190 + (byte − 0x41).
        if (inRange(bite, 0x41, 0xFE))
          pointer = (lead - 0x81) * 190 + (bite - 0x41);

        // 2. Let code point be null, if pointer is null, and the
        // index code point for pointer in index euc-kr otherwise.
        var code_point = (pointer === null)
              ? null : indexCodePointFor(pointer, index('euc-kr'));

        // 3. If code point is null and byte is an ASCII byte, prepend
        // byte to stream.
        if (pointer === null && isASCIIByte(bite))
          stream.prepend(bite);

        // 4. If code point is null, return error.
        if (code_point === null)
          return decoderError(fatal);

        // 5. Return a code point whose value is code point.
        return code_point;
      }

      // 4. If byte is an ASCII byte, return a code point whose value
      // is byte.
      if (isASCIIByte(bite))
        return bite;

      // 5. If byte is in the range 0x81 to 0xFE, set euc-kr lead to
      // byte and return continue.
      if (inRange(bite, 0x81, 0xFE)) {
        euckr_lead = bite;
        return null;
      }

      // 6. Return error.
      return decoderError(fatal);
    };
  }
1068364
function IconvLiteEncoderStream(conv, options) {
    this.conv = conv;
    options = options || {};
    options.decodeStrings = false; // We accept only strings, so we don't need to decode them.
    Transform.call(this, options);
}