Function append_code

src/javascript/unishox2.js:169–218

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

}

function append_code(out, olen, ol, code, state, usx_hcodes, usx_hcode_lens) {
  var hcode = code >> 5;
  var vcode = code & 0x1f;
  if (usx_hcode_lens[hcode] == 0 && hcode != USX_ALPHA) return [ol, state];
  switch (hcode) {
    case USX_ALPHA:
      if (state != USX_ALPHA) {
        ol = append_switch_code(out, olen, ol, state);
        ol = append_bits(
          out,
          olen,
          ol,
          usx_hcodes[USX_ALPHA],
          usx_hcode_lens[USX_ALPHA]
        );
        state = USX_ALPHA;
      }
      break;
    case USX_SYM:
      ol = append_switch_code(out, olen, ol, state);
      ol = append_bits(
        out,
        olen,
        ol,
        usx_hcodes[USX_SYM],
        usx_hcode_lens[USX_SYM]
      );
      break;
    case USX_NUM:
      if (state != USX_NUM) {
        ol = append_switch_code(out, olen, ol, state);
        ol = append_bits(
          out,
          olen,
          ol,
          usx_hcodes[USX_NUM],
          usx_hcode_lens[USX_NUM]
        );
        if (
          usx_sets[hcode].charCodeAt(vcode) >= 48 &&
          usx_sets[hcode].charCodeAt(vcode) <= 57
        )
          state = USX_NUM;
      }
  }
  return [
    append_bits(out, olen, ol, usx_vcodes[vcode], usx_vcode_lens[vcode]),
    state,
  ];
}

const count_bit_lens = new Uint8Array([2, 4, 7, 11, 16]);
const count_adder = [4, 20, 148, 2196, 67732];