[SOLVED] gunzip is unable to open a gz file

Aquarius_Girl · 10-07-2020, 04:36 AM

https://github.com/vanvught/h3dmx512..._ltc_smpte.zip

Code:

$ ls orangepi_zero.uImage.gz  
orangepi_zero.uImage.gz 

$ file orangepi_zero.uImage.gz  
orangepi_zero.uImage.gz: u-boot legacy uImage, http://www.orangepi-dmx.org, Firmware/ARM, Standalone Program (gzip), 105148 bytes, Fri Jul 31 16:26:39 2020, Load Address: 0x40000000, Entry Point: 0x40000000, Header CRC: 0xBE3C29C9, Data CRC: 0x5914EA8E 

$ gunzip orangepi_zero.uImage.gz  
gzip: orangepi_zero.uImage.gz: not in gzip format

It is saying that the file is not in gzip format. What do I have to use to open a .gz file?

Does it mean that the file is corrupted?

pan64 · 10-07-2020, 05:12 AM

that is not a gzip file, it is already uncompressed. So you can rename it to orangepi_zero.uImage (if you wish).

Aquarius_Girl · 10-07-2020, 05:16 AM

Oh, so it is some kind of image called uimage?

hazel · 10-07-2020, 05:21 AM

Looks like an OS image for an Orange Pi designed to boot from UBoot.

jefro · 10-07-2020, 03:22 PM

But they tend to be compressed in modern distro's. I assume the compression method is not in your version of gunzip. gzip -d file.gz tar, zcat or 7zip may be used but be sure you need to change it. It's unusual that a compressed file is further offered in a .gz format unless they wish to preserver some minimal data integrity.

Aquarius_Girl · 10-07-2020, 10:08 PM

Quote:

Originally Posted by jefro

But they tend to be compressed in modern distro's. I assume the compression method is not in your version of gunzip. gzip -d file.gz tar, zcat or 7zip may be used but be sure you need to change it. It's unusual that a compressed file is further offered in a .gz format unless they wish to preserver some minimal data integrity.

But I do hope that the conclusion that this is just an image and not any piece of code is correct.

I was interested in unzipping it in a hope that it might be some code.

pan64 · 10-08-2020, 12:53 AM

this is not zipped, therefore it cannot be unzipped.
And if you want to check the content better to go for the sources.

hazel · 10-08-2020, 04:22 AM

Quote:

Originally Posted by TheIndependentAquarius

But I do hope that the conclusion that this is just an image and not any piece of code is correct.

I was interested in unzipping it in a hope that it might be some code.

Well, if it's an OS or an OS stub, then it is code, but it will be binary code so you won't be able to read it. My guess is that it's a real-mode binary that acts as a high level bootloader for your final system, something like GRUB's core.img.

The term "image" is often used of compressed operating systems, the kind of thing a bootloader can load.

jefro · 10-08-2020, 02:59 PM

https://stackoverflow.com/questions/...mage-vs-uimage