Cannot unarchive 7z files about unarr HOT 6 OPEN

7z t swiss_r922.7z

`7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=de_DE.UTF-8,Utf16=on,HugeFiles=on,64 bits,8 CPUs Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz (206A7),ASM,AES-NI)

Scanning the drive for archives:
1 file, 3622848 bytes (3538 KiB)

Testing archive: ../test/swiss_r922.7z
--
Path = ../test/swiss_r922.7z
Type = 7z
Physical Size = 3622848
Headers Size = 715
Method = LZMA:24 BCJ PPC
Solid = +
Blocks = 3

Everything is Ok                                                     

Folders: 11
Files: 19
Size:       33161999
Compressed: 3622848
`

Method = LZMA:24 BCJ PPC

The decompression code for 7z archives is taken from the ANSI-C implementation of the LZMA SDK. As far as I can tell, that code only includes filters for x86 and IA64 but not for PPC and other architectures, which is the reason the decompression is failing.

from unarr.

Is that to say this is an endianness issue?

from unarr.

No, this is simply a missing decompression method/filter. There is a good chance I can fix this by adding the missing method from 7z code, but I need to look into it.

from unarr.

So I just had a closer look at this and it appears the filter is not missing. The errors unarr shows indicate a problem with CRC values (Error 3) and unsupported format (Error 4).
p7zip 16.02 on my machine reports it as a valid file while the ANSI-C decoder from LZMA-SDK 19.00 reports it as unsupported. This archive was likely not created with standard parameters and I need to do a more thorough investigation what exactly is happening here.

from unarr.

Seems like the archival step has changed since this issue was created (possibly prompted by the report). emukidid/swiss-gc@db7c168

from unarr.

Thanks for the follow-up. I checked and the new files provided by swiss-gc work fine. I am not sure why the old files do not work, but this is likely due to a bug or edge case in the lzma-sdk.
Funny thing is, p7zip actually reports the same filter/compression combination for both the 'broken' and the new files on my system.

from unarr.