A bootloader image which only seems to have been used on a few ASUS
devices. The encoding is ASCII, because the releasetools.py script
is written using Python 2, where the default encoding is ASCII.
A test file can be found in the firmware files for the "fugu" device, which can be downloaded from https://developers.google.com/android/images
This page hosts a formal specification of ASUS Fugu bootloader.img format (version 2 and later) using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for Python generated by Kaitai Struct depends on the Python runtime library. You have to install it before you can parse data.
The Python runtime library can be installed from PyPI:
python3 -m pip install kaitaistructParse a local file and get structure in memory:
data = AndroidBootldrAsus.from_file("path/to/local/file.img")
Or parse structure from a bytes:
from kaitaistruct import KaitaiStream, BytesIO
raw = b"\x00\x01\x02..."
data = AndroidBootldrAsus(KaitaiStream(BytesIO(raw)))
After that, one can get various attributes from the structure by invoking getter methods like:
data.images # => Only three images are included: `ifwi.bin`, `droidboot.img`
and `splashscreen.img`
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
import kaitaistruct
from kaitaistruct import KaitaiStruct, KaitaiStream, BytesIO
if getattr(kaitaistruct, 'API_VERSION', (0, 9)) < (0, 9):
raise Exception("Incompatible Kaitai Struct Python API: 0.9 or later is required, but you have %s" % (kaitaistruct.__version__))
class AndroidBootldrAsus(KaitaiStruct):
"""A bootloader image which only seems to have been used on a few ASUS
devices. The encoding is ASCII, because the `releasetools.py` script
is written using Python 2, where the default encoding is ASCII.
A test file can be found in the firmware files for the "fugu" device,
which can be downloaded from <https://developers.google.com/android/images>
.. seealso::
Source - https://android.googlesource.com/device/asus/fugu/+/android-8.1.0_r5/releasetools.py
"""
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.magic = self._io.read_bytes(8)
if not self.magic == b"\x42\x4F\x4F\x54\x4C\x44\x52\x21":
raise kaitaistruct.ValidationNotEqualError(b"\x42\x4F\x4F\x54\x4C\x44\x52\x21", self.magic, self._io, u"/seq/0")
self.revision = self._io.read_u2le()
if not self.revision >= 2:
raise kaitaistruct.ValidationLessThanError(2, self.revision, self._io, u"/seq/1")
self.reserved1 = self._io.read_u2le()
self.reserved2 = self._io.read_u4le()
self.images = []
for i in range(3):
self.images.append(AndroidBootldrAsus.Image(self._io, self, self._root))
class Image(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.chunk_id = (self._io.read_bytes(8)).decode(u"ASCII")
if not ((self.chunk_id == u"IFWI!!!!") or (self.chunk_id == u"DROIDBT!") or (self.chunk_id == u"SPLASHS!")) :
raise kaitaistruct.ValidationNotAnyOfError(self.chunk_id, self._io, u"/types/image/seq/0")
self.len_body = self._io.read_u4le()
self.flags = self._io.read_u1()
_ = self.flags
if not (_ & 1) != 0:
raise kaitaistruct.ValidationExprError(self.flags, self._io, u"/types/image/seq/2")
self.reserved1 = self._io.read_u1()
self.reserved2 = self._io.read_u1()
self.reserved3 = self._io.read_u1()
self.body = self._io.read_bytes(self.len_body)
@property
def file_name(self):
if hasattr(self, '_m_file_name'):
return self._m_file_name
self._m_file_name = (u"ifwi.bin" if self.chunk_id == u"IFWI!!!!" else (u"droidboot.img" if self.chunk_id == u"DROIDBT!" else (u"splashscreen.img" if self.chunk_id == u"SPLASHS!" else u"")))
return getattr(self, '_m_file_name', None)