Re: [Bug-tar] added support for lz4 and zstd

[Sven C. Dack]

Hello,

I'm sending you an updated patch against the current git master. Note, 
in addition to supporting lz4 and zstd does it add a single 'break;' 
into tar.c at line 1130:

     case LZOP_OPTION:
       s = xasprintf (_("filter the archive through %s"), LZOP_PROGRAM);
+      break;

which previously caused the case to fall-through and for the --help 
option to print a wrong message regarding what gets filter through which 
compression tool. Because it's a single, missing break-statement did I 
not create an extra patch for it.

Regards,

Sven




On 05/08/17 15:25, Sven C. Dack wrote:
> Hello,
>
> I've created a patch for tar, which adds support for lz4 and zstd 
> compression. Both compression tools have become increasingly popular 
> and offer high-speed compression and decompression, making them 
> interesting alternatives to previous compression tools.
>
> lz4 is similar to lzo, but offers faster decompression. zstd is 
> similar to gzip, but offers much faster compression and decompression.
>
> See also:
>
>     http://lz4.github.io/lz4/
>
>     http://facebook.github.io/zstd/
>
> For example, creating an archive from a directory of 1.12 GB 
> containing binary and ASCII files ("/usr/local/gnu/"):
>
> Compression
>
> name         time     size       ratio
> gnu.tar.gz     57.2s  534077354  44.3%
> gnu.tar.bz2  1:53.9s  509401491  42.3%
> gnu.tar.xz   7:15.6s  423886520  35.2%
> gnu.tar.lz   7:37.2s  425162846  35.3%
> gnu.tar.lzo     4.7s  676569472  56.2%
> gnu.tar.lz4     4.9s  676600069  56.2%
> gnu.tar.zst    10.7s  517897416  43.0%
>
> Decompression
>
> name         time
> gnu.tar.gz    7.1s
> gnu.tar.bz2  45.2s
> gnu.tar.xz   26.3s
> gnu.tar.lz   30.4s
> gnu.tar.lzo   3.5s
> gnu.tar.lz4   2.0s
> gnu.tar.zst   3.2s
>
> A second example using the Linux kernel source code (4.12.4), 
> containing 697 MB of data:
>
> Compression
>
> name           time     size       ratio
> linux.tar.gz     28.2s  156988489  21.4%
> linux.tar.bz2  1:05.5s  120659282  16.5%
> linux.tar.xz   4:26.9s  102214892  13.9%
> linux.tar.lz   4:18.4s  104105244  14.2%
> linux.tar.lzo     3.6s  261745137  35.7%
> linux.tar.lz4     3.9s  252707015  34.5%
> linux.tar.zst     5.9s  150448272  20.5%
>
> Decompression
>
> name           time
> linux.tar.gz    3.6s
> linux.tar.bz2  19.4s
> linux.tar.xz    7.2s
> linux.tar.lz    8.1s
> linux.tar.lzo   2.5s
> linux.tar.lz4   1.5s
> linux.tar.zst   2.1s
>
> (The tools were used with their default arguments. The hardware used 
> was an AMD FX8350 4GHz.)
>
> Attached files are:
>
> patch-part-1 - diffs of buffer.c config.h.in configure.ac suffix.c tar.c
> patch-part-2 - diffs of tar.texi tar.1 cs.po de.po fi.po ga.po id.po 
> ru.po sl.po zh_CN.po
>
> Cheers

lz4+zstd.patch
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