stringencoding/src/EUCKRDecoder.js

Encode to/from Typed Array buffers

  /**
   * @constructor
   * @param {{fatal: boolean}} options
   */
  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);
    };
  }