NetworkingPeer.DeltaCompressionWrite C# (CSharp) Method

    private bool DeltaCompressionWrite(PhotonView view, Hashtable data)
    {
        if (view.lastOnSerializeDataSent == null)
        {
            return true; // all has to be sent
        }

        // We can compress as we sent a full update previously (readers can re-use previous values)
        object[] lastData = view.lastOnSerializeDataSent;
        object[] currentContent = data[(byte)1] as object[];

        if (currentContent == null)
        {
            // no data to be sent
            return false;
        }

        if (lastData.Length != currentContent.Length)
        {
            // if new data isn't same length as before, we send the complete data-set uncompressed
            return true;
        }

        object[] compressedContent = new object[currentContent.Length];
        int compressedValues = 0;

        List<int> valuesThatAreChangedToNull = new List<int>();
        for (int index = 0; index < compressedContent.Length; index++)
        {
            object newObj = currentContent[index];
            object oldObj = lastData[index];
            if (this.ObjectIsSameWithInprecision(newObj, oldObj))
            {
                // compress (by using null, instead of value, which is same as before)
                compressedValues++;
                // compressedContent[index] is already null (initialized)
            }
            else
            {
                compressedContent[index] = currentContent[index];

                // value changed, we don't replace it with null
                // new value is null (like a compressed value): we have to mark it so it STAYS null instead of being replaced with previous value
                if (newObj == null)
                {
                    valuesThatAreChangedToNull.Add(index);
                }
            }
        }

        // Only send the list of compressed fields if we actually compressed 1 or more fields.
        if (compressedValues > 0)
        {
            data.Remove((byte)1); // remove the original data (we only send compressed data)

            if (compressedValues == currentContent.Length)
            {
                // all values are compressed to null, we have nothing to send
                return false;
            }

            data[(byte)2] = compressedContent; // current, compressted data is moved to key 2 to mark it as compressed
            if (valuesThatAreChangedToNull.Count > 0)
            {
                data[(byte)3] = valuesThatAreChangedToNull.ToArray(); // data that is actually null (not just cause we didn't want to send it)
            }
        }

        return true;    // some data was compressed but we need to send something
    }