Andes Firmware Image layout as seen in MT76 Wifi Chipsets: Python parsing library

Firmware image found with MediaTek MT76xx wifi chipsets.

Application

Firmware Image wifi chipset

KS implementation details

License: CC0-1.0

This page hosts a formal specification of Andes Firmware Image layout as seen in MT76 Wifi Chipsets using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.

Usage

Parse a local file and get structure in memory:

data = AndesFirmware.from_file("path/to/local/file.Andes Firmware Image layout as seen in MT76 Wifi Chipsets")

Or parse structure from a bytes:

from kaitaistruct import KaitaiStream, BytesIO

raw = b"\x00\x01\x02..."
data = AndesFirmware(KaitaiStream(BytesIO(raw)))

After that, one can get various attributes from the structure by invoking getter methods like:

data.imageHeader # => get image header

Python source code to parse Andes Firmware Image layout as seen in MT76 Wifi Chipsets

andes_firmware.py

# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild

from pkg_resources import parse_version
from kaitaistruct import __version__ as ks_version, KaitaiStruct, KaitaiStream, BytesIO


if parse_version(ks_version) < parse_version('0.7'):
    raise Exception("Incompatible Kaitai Struct Python API: 0.7 or later is required, but you have %s" % (ks_version))

class AndesFirmware(KaitaiStruct):
    """Firmware image found with MediaTek MT76xx wifi chipsets."""
    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._raw_image_header = self._io.read_bytes(32)
        io = KaitaiStream(BytesIO(self._raw_image_header))
        self.image_header = self._root.ImageHeader(io, self, self._root)
        self.ilm = self._io.read_bytes(self.image_header.ilm_len)
        self.dlm = self._io.read_bytes(self.image_header.dlm_len)

    class ImageHeader(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.ilm_len = self._io.read_u4le()
            self.dlm_len = self._io.read_u4le()
            self.fw_ver = self._io.read_u2le()
            self.build_ver = self._io.read_u2le()
            self.extra = self._io.read_u4le()
            self.build_time = (self._io.read_bytes(16)).decode(u"UTF-8")