topin89/lbf_extractor.py

## lbf_extractor.py
# For modern LG backup files use a script from here:  https://github.com/Mysak0CZ/LBFtool
# with details from there https://forum.xda-developers.com/android/general/tool-lg-restore-com-lge-bnr-lbf-file-t4053579

# Fair warning, this script was designed for really old version of LGBackup and won't work on with new devices
# So, if you don't get what you wanted, try to use every data carving tools you can get
#
# Also, good person with nickname SEVENTY ONE recommends ExtractJPEG( https://www.gunamoi.com.au/soft/extractjpeg/download.html )
# To, well, extract JPG Images from a backup

# 0. You will need 7-zip context menu "Extract here".
# 1. Edit filename to your backup file
# 2. Run this script from same folder
# 3. Select all *.brokenscript and choose 7-zip > Extract here
# 4. On overwrite request, choose either "Yes to all" or "No to all", id doesn't matter
# 5. Ta-da! You just got your files.
# 6. Most .db files are in fact SQLite DBs, you can open 'em with SQLiteStudio
# 7. Sms/sms.vmsg you can read here: http://sms-vmsg.org/sms-reader-app/free-app/
# 8. Guess you can import SMS and MMS to your phone with this app (I don't know, It was friend's backup) https://play.google.com/store/apps/details?id=com.aoe.vmgconverter&hl=ru
# 9. All else, I don't know
# 10. May google be with you


import mmap
index=0

filename=f"LGBackup_xxxxxx.lbf"


def read_in_chunks(file_object, chunk_size=1024):
    """Lazy function (generator) to read a file piece by piece.
    Default chunk size: 1k."""
    while True:
        data = file_object.read(chunk_size)
        if not data:
            break
        yield data

def find_in_file(f,signature, startpos):
    prev=b''
    chunk_size=2**20
    for i,cur in enumerate(read_in_chunks(f,chunk_size)):
        searchee=prev+cur
        pos=searchee.find(signature)
        if pos>=0:
            return i*chunk_size+pos-len(prev)+startpos
        prev=cur
    else:
        return -1

with open(filename,"rb") as backup:
    starpos=0
    while True:
        pos=find_in_file(backup, b'PK\x03\x04',starpos)
        if pos<0:
            break

        print(backup.tell())
        backup.seek(pos)
        print(backup.tell())

        index+=1
        filename=f"{index}.brokenzip"
        with open(filename,"wb") as nextfile:
            for chunk in read_in_chunks(backup,2**20):
                nextfile.write(chunk)

        starpos=pos+1
        backup.seek(starpos)
        print(backup.tell())
        print()

## lbf_extractor_unpacker.py
# For modern LG backup files use a script from here:  https://github.com/Mysak0CZ/LBFtool
# with details from there https://forum.xda-developers.com/android/general/tool-lg-restore-com-lge-bnr-lbf-file-t4053579

# Fair warning, this script was designed for really old version of LGBackup and won't work on with new devices
# So, if you don't get what you wanted, try to use every data carving tools you can get
#
# Also, good person with nickname SEVENTY ONE recommends ExtractJPEG( https://www.gunamoi.com.au/soft/extractjpeg/download.html )
# To, well, extract JPG Images from a backup

# 0. You will need 7-zip.
# 1. Find 7z.exe in a 7-zip folder in Program Files (or whenever you install it) and copy it to a folder with the script
# 2. Edit filename to your backup file
# 3. Run this script from same folder
# 4. Wait a bit (maybe a lot). New subfolder "restored" should appear.
# 5. Ta-da! You just got your files.
# 6. Most .db files are in fact SQLite DBs, you can open 'em with SQLiteStudio
# 7. Sms/sms.vmsg you can read here: http://sms-vmsg.org/sms-reader-app/free-app/
# 8. Guess you can import SMS and MMS to your phone with this app (I don't know, It was friend's backup) https://play.google.com/store/apps/details?id=com.aoe.vmgconverter&hl=ru
# 9. All else, I don't know
# 10. May google be with you


import mmap
from os import system, remove

filename=f"LGBackup_xxxxxx.lbf"
filename_output=f"one_and_only.brokenzip"

def read_in_chunks(file_object, chunk_size=1024):
    """Lazy function (generator) to read a file piece by piece.
    Default chunk size: 1k."""
    while True:
        data = file_object.read(chunk_size)
        if not data:
            break
        yield data

def find_in_file(f,signature, startpos):
    prev=b''
    chunk_size=2**20
    for i,cur in enumerate(read_in_chunks(f,chunk_size)):
        searchee=prev+cur
        pos=searchee.find(signature)
        if pos>=0:
            return i*chunk_size+pos-len(prev)+startpos
        prev=cur
    else:
        return -1

def unpack_brokenzip(filename_output):
    system(f"7z x -aou -orestored {filename_output}")

with open(filename,"rb") as backup:
    starpos=0
    while True:
        pos=find_in_file(backup, b'PK\x03\x04',starpos)
        if pos<0:
            break

        backup.seek(pos)
        print(backup.tell())

        with open(filename_output,"wb") as nextfile:
            for chunk in read_in_chunks(backup,2**20):
                nextfile.write(chunk)

        unpack_brokenzip(filename_output)

        starpos=pos+1
        backup.seek(starpos)

remove(filename_output)

## zip_anonymizer.py
# For modern LG backup files use a script from here:  https://github.com/Mysak0CZ/LBFtool
# with details from there https://forum.xda-developers.com/android/general/tool-lg-restore-com-lge-bnr-lbf-file-t4053579

filename="LGBackup_xxxxxx.lbf"
filename_out="LGBackup_xxxxxx_headers_only.lbf"

CHUNK_LENGTH=4096
HEADER=b'PK\x03\x04'

with open(filename,"rb") as backup, open(filename_out,"wb") as newfile:
    window=bytearray(backup.read(CHUNK_LENGTH*2))
    while window:
        header_pos=window.find(HEADER)
        if header_pos > -1:
            newfile.write(b'0'*header_pos+HEADER)
            del window[:header_pos+4]
        elif len(window)>CHUNK_LENGTH:
            newfile.write(b'0'*CHUNK_LENGTH)
            del window[:CHUNK_LENGTH]
        else:
            newfile.write(b'0'*len(window))
            del window[:]
        window+=bytearray(backup.read(CHUNK_LENGTH))
	# For modern LG backup files use a script from here: https://github.com/Mysak0CZ/LBFtool
	# with details from there https://forum.xda-developers.com/android/general/tool-lg-restore-com-lge-bnr-lbf-file-t4053579

	# Fair warning, this script was designed for really old version of LGBackup and won't work on with new devices
	# So, if you don't get what you wanted, try to use every data carving tools you can get
	#
	# Also, good person with nickname SEVENTY ONE recommends ExtractJPEG( https://www.gunamoi.com.au/soft/extractjpeg/download.html )
	# To, well, extract JPG Images from a backup

	# 0. You will need 7-zip context menu "Extract here".
	# 1. Edit filename to your backup file
	# 2. Run this script from same folder
	# 3. Select all *.brokenscript and choose 7-zip > Extract here
	# 4. On overwrite request, choose either "Yes to all" or "No to all", id doesn't matter
	# 5. Ta-da! You just got your files.
	# 6. Most .db files are in fact SQLite DBs, you can open 'em with SQLiteStudio
	# 7. Sms/sms.vmsg you can read here: http://sms-vmsg.org/sms-reader-app/free-app/
	# 8. Guess you can import SMS and MMS to your phone with this app (I don't know, It was friend's backup) https://play.google.com/store/apps/details?id=com.aoe.vmgconverter&hl=ru
	# 9. All else, I don't know
	# 10. May google be with you


	import mmap
	index=0

	filename=f"LGBackup_xxxxxx.lbf"


	def read_in_chunks(file_object, chunk_size=1024):
	"""Lazy function (generator) to read a file piece by piece.
	Default chunk size: 1k."""
	while True:
	data = file_object.read(chunk_size)
	if not data:
	break
	yield data

	def find_in_file(f,signature, startpos):
	prev=b''
	chunk_size=2**20
	for i,cur in enumerate(read_in_chunks(f,chunk_size)):
	searchee=prev+cur
	pos=searchee.find(signature)
	if pos>=0:
	return i*chunk_size+pos-len(prev)+startpos
	prev=cur
	else:
	return -1

	with open(filename,"rb") as backup:
	starpos=0
	while True:
	pos=find_in_file(backup, b'PK\x03\x04',starpos)
	if pos<0:
	break

	print(backup.tell())
	backup.seek(pos)
	print(backup.tell())

	index+=1
	filename=f"{index}.brokenzip"
	with open(filename,"wb") as nextfile:
	for chunk in read_in_chunks(backup,2**20):
	nextfile.write(chunk)

	starpos=pos+1
	backup.seek(starpos)
	print(backup.tell())
	print()
	# For modern LG backup files use a script from here: https://github.com/Mysak0CZ/LBFtool
	# with details from there https://forum.xda-developers.com/android/general/tool-lg-restore-com-lge-bnr-lbf-file-t4053579

	filename="LGBackup_xxxxxx.lbf"
	filename_out="LGBackup_xxxxxx_headers_only.lbf"

	CHUNK_LENGTH=4096
	HEADER=b'PK\x03\x04'

	with open(filename,"rb") as backup, open(filename_out,"wb") as newfile:
	window=bytearray(backup.read(CHUNK_LENGTH*2))
	while window:
	header_pos=window.find(HEADER)
	if header_pos > -1:
	newfile.write(b'0'*header_pos+HEADER)
	del window[:header_pos+4]
	elif len(window)>CHUNK_LENGTH:
	newfile.write(b'0'*CHUNK_LENGTH)
	del window[:CHUNK_LENGTH]
	else:
	newfile.write(b'0'*len(window))
	del window[:]
	window+=bytearray(backup.read(CHUNK_LENGTH))