typescriptDecode

Typescript code to store/read binary files in Starknet :

Launch starknet-devnet

deployement of the contract :

npx ts-node ./src/1.declareDeployContract.ts

After creation of the king.json file with the file2felts tool, you send the data in a new smart-contract.

This contract is already declared in Tesnet with this Class_hash And has been deployed first here

You can deploy your own contract (including your own binary file), using this class.

use of the contract with Starknet.js :

npx ts-node ./src/2.CallInvokeContract.ts

You ask to the contract to send you the content of the binary file, the result is kingRead.json.

Recover the binary file in your computer :

npx ts-node ./src/3.decodeJson.ts

A file kingRecovered.gif is created, identical to the original king.gif.
Then you can use this result in your DAPP.
Typical use case is a non upgradable NFT smart-contract, that includes a tiny picture of the NFT. It's an ultra strong proof that this picture belong to this NFT.