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/*! \page hregions Immutable header regions in rpm-4.0.1 and later
The header data structure has changed in rpm-4.0.[12] to preserve the
original header from a package. The goal is to keep the original
header intact so that metadata can be verified separately from the
payload by the RHN up2date client and by the rpm command line verify
mode using signatures saved in the rpm database. I believe the change
is entirely forward and backward compatible, and will not require
any artifacts like changing the version number of packaging or
adding an "rpmlib(...)" tracking dependency. We'll see ...
Here's a short description of the change. An rpm header has three sections:
\verbatim
1) intro (# entries in index, # bytes of data)
2) index 16 byte entries, one per tag, big endian
3) data tag values, properly aligned, big endian
\endverbatim
Representing sections in the header (ignoring the intro) with
\verbatim
A,B,C index entries sorted by tag number
a,b,c variable length entry data
| boundary between index/data
\endverbatim
a header with 3 tag/value pairs (A,a) can be represented something like
\verbatim
ABC|abc
\endverbatim
The change is to introduce a new tag that keeps track of a contiguous
region (i.e. the original header). Representing the boundaries with
square/angle brackets, an "immutable region" in the header thus becomes
\verbatim
[ABC|abc]
\endverbatim
or more generally (spaces added for clarity)
\verbatim
[ABC> QRS | [DEF> QRS | > QRS | < QRS XYZ | QRS D |