Convert sparse filesystem images (.img) into sparse Android data images (.dat)
This binary requires Python 3 or newer installed on your system.
img2sdat.py <partition_img> [-o outdir] [-v version]
<partition_img>= input partition image[-o outdir]= output directory (current directory by default)[-v version]= transfer list version number (3 - 6.0, 4 - 7.0, more info on xda thread)
This is a simple example on a Linux system:
~$ ./img2sdat.py system.img -o tmp -v 4
It will create system.new.dat, system.patch.dat and system.transfer.list in the tmp directory.
For more information about this binary, visit it's XDA page.