README


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Description

Xlunzip is a test tool for the lzip decompression code of my lzip patch
for linux. Xlunzip is similar to lunzip, but it uses the lzip_decompress
linux module as a backend. Xlunzip tests the module for stream,
buffer-to-buffer and mixed decompression modes, including in-place
decompression (using the same buffer for input and output). You can use
xlunzip to verify that the module produces correct results when
decompressing single member files, multimember files, or the
concatenation of two or more compressed files. Xlunzip can be used with
unzcrash to test the robustness of the module to the decompression of
corrupted data.

Note that the in-place decompression of concatenated files can't be
guaranteed to work because an arbitrarily low compression ratio of the
last part of the data can be achieved by appending enough empty
compressed members to a file, masking a high compression ratio at the
beginning of the data.

The xlunzip tarball contains a copy of the lzip_decompress module and
can be compiled and tested without downloading or applying the patch to
the kernel.
 
My lzip patch for linux can be found at
http://download.savannah.gnu.org/releases/lzip/kernel/

Lzip related components in the kernel
=====================================

The lzip_decompress module in lib/lzip_decompress.c provides a versatile
lzip decompression function able to do buffer to buffer decompression or
stream decompression with fill and flush callback functions. The usage
of the function is documented in include/linux/lzip.h.

For decompressing the kernel image, initramfs, and initrd, there is a
wrapper function in lib/decompress_lunzip.c providing the same common
interface as the other decompress_*.c files, which is defined in
include/linux/decompress/generic.h.


Copyright (C) 2016-2020 Antonio Diaz Diaz.

This file is free documentation: you have unlimited permission to copy,
distribute, and modify it.

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