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Re: a few tar.xz packages are bigger than their uncompressed tar

From: Jérôme Bouat <jerome dot bouat at wanadoo dot fr>
To: cygwin at cygwin dot com
Date: Thu, 5 Oct 2017 21:10:16 +0200
Subject: Re: a few tar.xz packages are bigger than their uncompressed tar
Authentication-results: sourceware.org; auth=none
References: <cc1a2cd5-a947-624e-4473-73151794a5d7@laposte.net> <960ca9df83cf80f4321a69f2d8b8c0ba@mail.kylheku.com>

Hello

No compression method need ever increase the
size of the datum by more than one bit.

The compressed representation can begin with a header
bit which is 1 to indicate "compressed" and 0 to indicate
"stored without compression".


Does the xz format provide a checksum even if the file is stored without compression ?

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References:
- Re: a few tar.xz packages are bigger than their uncompressed tar
  - From: Kaz Kylheku

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