The documentation for Debian and the dpkg package managment system explains the debian/control files are meta data for packages, e.g. these docs explain:
The control file contains the information that the package manager (such as apt-get, synaptic, and adept) uses, build-time dependencies, maintainer information, and much more.
On ubuntu the file
/var/lib/dpkg/status contains the contents of installed packages control files, but when ever I have extracted packages I have never seen a control file in the package itself.
My understanding the APT/DPKG system that ubuntu and debian uses is that the
apt-get update command will connect to all defined repositories and pull down a
package.gz file for each repo.
In that case does the data defined in each packages control file get stored in the
package.gz so that it is available to the
apt-cache system - rather than directly to dpkg.
This makes sense to me because that would supply the meta data for a package to the
apt-cache showpkg command without having to install the package.
If this is not the case then where are the debian control files stored?