Encoding integers in solidity

Question

I have 3 integers of uint256 type in my solidity code. Now I want encode these 3 integers into one single integer. How can I do it?

Answer 1

There are different ways to do this but I am going to share the method that I use.

The method I use to encode is bitshifting. What you have to do is, to encode, you have to move the numbers into sequential 32-bit section. And to decode the integer, you do the opposite. I am also sharing the code I use:

pragma solidity 0.4.24;


contract Test {

    function encodeNumbers(uint256 a, uint256 b, uint256 c) public view returns(uint256 encoded) {

        encoded |= (a << 64);

        encoded |= (b << 32);

        encoded |= (c);

        return encoded;

    }


    function decodeNumber(uint256 encoded) public view returns (uint256 a, uint256 b, uint256 c) {

        a = encoded >> 64;

        b = (encoded << 192) >> 224;

        c = (encoded << 224) >> 224;

        return;

    }

}