[Rpm-maint] [rpm-software-management/rpm] Updated v3 and v4 package + header format documentation (PR #2861)

[Daniel Alley]

@dralley commented on this pull request.



> +
+Field   | Value
+--------|------
+tag     | Must equal the Index Entry (ie 62 or 63)
+type    | BIN
+offset  | Size of the region entries in the Index
+count   | 16
+
+The number of entries in the region (aka region index length) can thus be
+calculated as `ril = -offset / sizeof(struct index_entry)`.
+
+When reading a package from disk, the number of region entries is expected
+to be the same as the index length in the Intro. However when a package
+is installed, extra data such as the install time is added to the header,
+that data falls outside the otherwise invisible region line in the index.
+These tags outside the immutable region are called "dribbles" in the RPM

This happens to satisfy https://github.com/rpm-software-management/rpm/issues/2462, so thanks for that! Feel free to close it or mark it to be closed automatically on merge of the commit.

I do also have a side remark under that issue, and I'm wondering if that should be tracked as a brand new issue, or discussion, etc. https://github.com/rpm-software-management/rpm/issues/2462#issuecomment-1493217258



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