When un7zip size of 100GB.7z and 10GB.7z files report an error ：'unarr: No valid RAR, ZIP, 7Z or TAR archive'

[haoyutc]

Use dd create 1GB 10GB 100GB file
dd if=/dev/random of=data1GB.bin bs=40m count=25
dd if=/dev/random of=data10GB.bin bs=400m count=25
dd if=/dev/random of=data100GB.bin bs=4000m count=25
and use command '7z a' archive to data1GB.7z data10GB.7z data100GB.7z
When un7zip size of 100GB.7z and 10GB.7z files report an error ：'unarr: No valid RAR, ZIP, 7Z or TAR archive'
But, un7zip size under 1GB file successfully!!!

Last，I test 2GB / 3GB / 4GB /5GB ,only 2GB file success, and above 2GB file failed!

OS : macOS 12.4
GOVERSION="go1.18.3"

gen2brain/go-unarr#32

[selmf]

The 7z lzma-sdk is limited to 2GiB when running on a 32 bit system but should have no problems processing larger files when running on 64bit systems. Since you use macOS 12.4, it is save to assume you are running a 64bit CPU.

I am not familiar with the build process go-unarr uses, but since it is a custom build my guess is that large file support is not enabled.

More information is available on Wikipedia.

@gen2brain are you setting _FILE_OFFSET_BITS=64 in the C flags for Unix/MingW builds?

[gen2brain]

@selfm Thanks for the info, that is probably the issue, I did add defines I found in the old Makefile that was Windows only if I remember correctly. I will check when I get to a computer.

[gen2brain]

Fixed in gen2brain/go-unarr@db3833a. Thanks.