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Re: [Lzip-bug] Tarball indexing and plzip

From: Antonio Diaz Diaz
Subject: Re: [Lzip-bug] Tarball indexing and plzip
Date: Tue, 12 Mar 2019 15:37:41 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv: Gecko/20110420 SeaMonkey/2.0.14

Hi Dennis,

Dennis Katsonis wrote:
The difference is when decompressing a single file from near the end of
the archive.

I expect tarlz to become as fast as pixz in this case as soon as parallel extraction is implemented in tarlz, with the advantage that tarlz produces standard .lz files while pixz uses a non-standard extension to the xz format (trailing data).

The difficulty would be supporting the different tar formats (ustar,
xustar, exustar, etc).

I do not plan to support anything but a cleaned-up variant of the pax format in tarlz. Here you may see why:

Note that the tarlz format is mainly ustar. Extended pax headers are used only when needed because the length of a filename or link name, or the size of a file exceed the limits of the ustar format.

Perhaps indexing could be abstracted in a particular way, so that
anyone using the library could use this for their own compressed file

Indexing in tarlz is provided by the lzip format itself. It is not generalizable to other compressed formats.

Best regards,

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