Home/ Questions/Q 8124899
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-06T06:37:20+00:00

I’m sending from server to clients base64 strings with decoded coordinates of some objects.

  • 0

I’m sending from server to clients base64 strings with decoded coordinates of some objects. There are ~20 objects with x;y pair, 2 bytes per integer. This coords changes with time but some of them saves same values for about 2-3 sending calls.

Any ways to calculate the difference and send it instead of full base64 each time? The network traffic is very important here.

Here is the example of 2 strings made with 100ms pause:

AFg7IP+SAAJg/ana/zAA52BJO/D/9wAxIFkAIABIABQBSADtAFEAMGlLctX/
AFo7IP+SAAJgAKnb/0EA6GBJO/D//wA0IFkAIABIABQBSADtAEoAYmlLctX/
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    First, pack the data efficiently in bytes, then encode if necessary. As @twall says, you should try hard to eliminate the base 64 because it expands the size of the data by 33% at least. Here is one way to pack it, if there are exactly 20 x,y pairs:

    Bytes 1-3: bitset. Each bit represents an x,y pair. If set, there is an updated value for that pair in this message. Last 4 bits of 3rd byte unused.

    Bytes 5&6 x coord of first point
    Bytes 7&8 y coord of first point

    … up to 19 more points

    Max of 83 bytes, min of 3 bytes (no coords updated)

    • 0