Function EncodeChunkRLE

src/openrct2/sawyer_coding/SawyerCoding.cpp:258–304

* Ensure dst_buffer is bigger than src_buffer then resize afterwards * returns length of dst_buffer */

     * returns length of dst_buffer
     */
    size_t EncodeChunkRLE(const uint8_t* src_buffer, uint8_t* dst_buffer, size_t length)
    {
        const uint8_t* src = src_buffer;
        uint8_t* dst = dst_buffer;
        const uint8_t* end_src = src + length;
        uint8_t count = 0;
        const uint8_t* src_norm_start = src;

        while (src < end_src - 1)
        {
            if ((count && *src == src[1]) || count > 125)
            {
                *dst++ = count - 1;
                std::memcpy(dst, src_norm_start, count);
                dst += count;
                src_norm_start += count;
                count = 0;
            }
            if (*src == src[1])
            {
                for (; (count < 125) && ((src + count) < end_src); count++)
                {
                    if (*src != src[count])
                        break;
                }
                *dst++ = 257 - count;
                *dst++ = *src;
                src += count;
                src_norm_start = src;
                count = 0;
            }
            else
            {
                count++;
                src++;
            }
        }
        if (src == end_src - 1)
            count++;
        if (count)
        {
            *dst++ = count - 1;
            std::memcpy(dst, src_norm_start, count);
            dst += count;
        }
        return dst - dst_buffer;
    }

    size_t EncodeChunkRepeat(const uint8_t* src_buffer, uint8_t* dst_buffer, size_t length)
    {