Decoding Alphanumeric Code Into Key Values Object Using Bytes

I have a 'crosshair code' from CS:GO game: CSGO-O4Jsi-V36wY-rTMGK-9w7qF-jQ8WB I can decode some values by using this function: import BigNumber from 'bignumber.js'; // Intentional

Solution 1:

Here you go. Add this parseBytes function, modify decode as shown, and keep the rest of your code as it.

function parseBytes(bytes) {
  return {
    cl_crosshairgap: Int8Array.of(bytes[2])[0] / 10.0,

    cl_crosshair_outlinethickness: (bytes[3] & 7) / 2.0,

    cl_crosshaircolor_r: bytes[4],
    cl_crosshaircolor_g: bytes[5],
    cl_crosshaircolor_b: bytes[6],
    cl_crosshairalpha: bytes[7],
    cl_crosshair_dynamic_splitdist: bytes[8],

    cl_fixedcrosshairgap: Int8Array.of(bytes[9])[0] / 10.0,

    cl_crosshaircolor: bytes[10] & 7,
    cl_crosshair_drawoutline: bytes[10] & 8 ? 1 : 0,
    cl_crosshair_dynamic_splitalpha_innermod: ((bytes[10] & 0xF0) >> 4) / 10.0,

    cl_crosshair_dynamic_splitalpha_outermod: (bytes[11] & 0xF) / 10.0,
    cl_crosshair_dynamic_maxdist_splitratio: ((bytes[11] & 0xF0) >> 4) / 10.0,

    cl_crosshairthickness: (bytes[12] & 0x3F) / 10.0,

    cl_crosshairstyle: (bytes[13] & 0xE) >> 1,
    cl_crosshairdot: bytes[13] & 0x10 ? 1 : 0,
    cl_crosshairgap_useweaponvalue: bytes[13] & 0x20 ? 1 : 0,
    cl_crosshairusealpha: bytes[13] & 0x40 ? 1 : 0,
    cl_crosshair_t: bytes[13] & 0x80 ? 1 : 0,

    cl_crosshairsize: (((bytes[15] & 0x1f) << 8) + bytes[14]) / 10.0
  };
}

const decode = shareCode => {
  if (!shareCode.match(SHARECODE_PATTERN)) {
    throw new Error('Invalid share code');
  }

  shareCode = shareCode.replace(/CSGO|-/g, '');
  const chars = Array.from(shareCode).reverse();
  let big = new BigNumber(0);

  for (let i = 0; i < chars.length; i++) {
    big = big.multipliedBy(DICTIONARY_LENGTH).plus(DICTIONARY.indexOf(chars[i]));
  }
  
  return parseBytes(bigNumberToByteArray(big));
}