Uploading hex string as bytes

[dino-rodriguez]

I'm currently trying to cast a hex string in forge to bytes and uploading it. But the string 0xaa, for example, gets uploaded as 4 bytes when it should be 1 byte. This is the approach I am taking:

bytes[] public traits = [bytes(<in memory string>)]

In hardhat this works "magically". You can pass a hex string to a solidity function that accepts bytes, and it does the right thing. e.g. 0xaa is one byte.

How do I successfully upload hex as bytes using forge?

[onbjerg]

This is a Solidity question for future reference, so you should be able to find the answer to that in the Solidity docs.

I think what you're looking for is hex"", e.g. hex"aa"

[dino-rodriguez]

Sorry, I didn't give a great example, edited it above to reflect what I am trying to do. I am aware I can do that with string literals. I am trying to do it with strings loaded in memory from a file using the foundry cheatcode. I don't think I can use hex for anything but string literals.

[onbjerg]

If you're using FFI and the output is well-formed hex starting with 0x it should give you back bytes, not a string

[dino-rodriguez]

Great, thank you. I'll give that a shot.