How can I read files(ex: .mp3 files) in hex-base and modify/append it?

Hello everyone,

My request is reading files in hex-base in phone storage, appending each files together and then putting a header in front of it. I have look up on internet and it seemed that there's no suggestion or relative article about it. Does anyone have an idea? Thanks in advance!


Hello Ian

Do you mean you actually want to join the files together to make one file?