Method encodeRunLengthSingle

src/OpenLoco/src/S5/SawyerStream.cpp:273–319

}

void SawyerStreamWriter::encodeRunLengthSingle(MemoryStream& buffer, std::span<const std::byte> data)
{
    auto src = data.data();
    auto srcEnd = src + data.size();
    auto srcNormStart = src;
    uint8_t count = 0;

    while (src < srcEnd - 1)
    {
        if ((count != 0 && src[0] == src[1]) || count > 125)
        {
            buffer.writeValue(static_cast<std::byte>(count - 1));
            buffer.write(srcNormStart, count);
            srcNormStart += count;
            count = 0;
        }
        if (src[0] == src[1])
        {
            for (; count < 125 && src + count < srcEnd; count++)
            {
                if (src[0] != src[count])
                {
                    break;
                }
            }
            buffer.writeValue(static_cast<std::byte>(257 - count));
            buffer.writeValue(src[0]);
            src += count;
            srcNormStart = src;
            count = 0;
        }
        else
        {
            count++;
            src++;
        }
    }
    if (src == srcEnd - 1)
    {
        count++;
    }
    if (count != 0)
    {
        buffer.writeValue(static_cast<std::byte>(count - 1));
        buffer.write(srcNormStart, count);
    }
}

void SawyerStreamWriter::encodeRunLengthMulti(MemoryStream& buffer, std::span<const std::byte> data)
{