[PATCH 5/5] lib: uncompress: add general zstd support

[Sascha Hauer]

On Thu, Jul 14, 2022 at 10:54:47AM +0200, Ahmad Fatoum wrote:
> On 14.07.22 10:45, Sascha Hauer wrote:
> > On Wed, Jul 13, 2022 at 12:09:22PM +0200, Ahmad Fatoum wrote:
> >> So far, we only supported zstd in squashfs and ubifs. Add support
> >> everywhere else: In PBL for decompressing barebox proper, in uncompress
> >> for compression arbitrary files and for bootm to decompress zstd
> >> kernel images.
> > 
> > Have you tested this with the uncompress command?
> > 
> > a zstd compressed barebox works here, but using uncompress
> > on a zstd compressed file results in:
> > 
> > ZSTD-compressed data is corrupt
> > 
> > or sometimes:
> > 
> > Out of memory while allocating ZSTD_DStream
> 
> I didn't test the uncompress command, no. How did you create
> the zstd file?

just a plain 'zstd foo' without any options.

> The Linux zstd decompression expects the size
> to be trailing the decompressed data and doesn't parse the
> zstd header. See the comment in scripts/Makefile.lib for details.

When it's expected that we can't use the uncompress command on zstd
files then we shouldn't support it.

Sascha

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |