jerrykan

#!/usr/bin/env python3

BACKUP_FILE = 'backup.ab'

# Constants
# ref: https://github.com/omnirom/android_bootable_recovery/blob/android-7.1/adbbu/twadbstream.h
TWRP = b'TWRP' + b'\x00\x00\x00\x00'

TWSTREAMHDR = b'twstreamheader'
TWFN = b'twfilename'

AlD

inf = open('backup.ab', 'rb')

out = open('backup.tar', 'wb')

buf = inf.read(512)

while buf != '':
    if buf[:8] == 'TWRP\x00\x00\x00\x00':
        print "Skipping %r" % buf[:16]
        buf = inf.read(512)