extracted file back to rpm

if u wanna extract rpm u simply use rpm2cpio ...
what should i do if i wanna make this extracted file convert backwards into rpm?

I'm not sure it is possible.
To create an rpm file, you usually start from a source code. You add a spec file, and package that into a .srpm file. You can the dreate the rpm package with rpmbuild.

I never saw a method to create an rpm file from a binary package.

HTH
Flupke

what do you mean by extracted file?
like a .tar or .bz2 file? or what?