> The rpm payload format isn't modified, although there's a slight "bending" of
> the cpio/newc spec to use the filename field for padding. zstandard frames
> making up the compressed rpm payload explicitly carry both compressed and
> uncompressed lengths, to allow detection of filesystem-supported I/O sizes.
Note that the cpio/newc format is on its way out, you don't want to design too
much around that. In rpm v4 it's used for packages where all contained files
are below 4GB, but v6 will always use the newer rpm-specific format which
doesn't carry any file metadata in the payload:
https://rpm-software-management.github.io/rpm/manual/format_v6.html#payload
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