unsigned int i = 0;
while ((i < size) && (offset < len))
{
    c = cBuffer[offset++];
    *(cOut + nOut++) = (table[(c & 0xF0U) >> 4]);  // add 1 byte for sure

    if (table[c & 0x0FU] != 0) // if table is 0 ?! it jump a byte.. ._.
    {
        *(cOut + nOut++) = table[c & 0x0FU];
    }

    i += 2; // increment 2 also if the second byte isn't added..
}