Function append_final_bits

src/javascript/unishox2.js:491–542

(
  out,
  olen,
  ol,
  state,
  is_all_upper,
  usx_hcodes,
  usx_hcode_lens
)

/// Appends the terminator code depending on the state, preset and whether full terminator needs to be encoded to out or not \n
function append_final_bits(
  out,
  olen,
  ol,
  state,
  is_all_upper,
  usx_hcodes,
  usx_hcode_lens
) {
  if (usx_hcode_lens[USX_ALPHA]) {
    if (USX_NUM != state) {
      // for num state, append TERM_CODE directly
      // for other state, switch to Num Set first
      ol = append_switch_code(out, olen, ol, state);
      ol = append_bits(
        out,
        olen,
        ol,
        usx_hcodes[USX_NUM],
        usx_hcode_lens[USX_NUM]
      );
    }
    ol = append_bits(
      out,
      olen,
      ol,
      usx_vcodes[TERM_CODE & 0x1f],
      usx_vcode_lens[TERM_CODE & 0x1f]
    );
  } else {
    // preset 1, terminate at 2 or 3 SW_CODE, i.e., 4 or 6 continuous 0 bits
    // see discussion: https://github.com/siara-cc/Unishox/issues/19#issuecomment-922435580
    ol = append_bits(
      out,
      olen,
      ol,
      TERM_BYTE_PRESET_1,
      is_all_upper ? TERM_BYTE_PRESET_1_LEN_UPPER : TERM_BYTE_PRESET_1_LEN_LOWER
    );
  }

  // fill byte with the last bit
  ol = append_bits(
    out,
    olen,
    ol,
    ol == 0 || out[(ol - 1) / 8] << ((ol - 1) & 7) >= 0 ? 0 : 0xff,
    (8 - (ol % 8)) & 7
  );

  return ol;
}

function compare_arr(arr1, arr2, is_str) {
  if (is_str) return arr1 === arr2;