Mozilla ARchive file is Mozilla's own archive format to distribute software updates. Test files can be found on Mozilla's FTP site, for example:
This page hosts a formal specification of Mozilla ARchive 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 = MozillaMar.from_file("path/to/local/file.mar")
Or parse structure from a bytes:
from kaitaistruct import KaitaiStream, BytesIO
raw = b"\x00\x01\x02..."
data = MozillaMar(KaitaiStream(BytesIO(raw)))
After that, one can get various attributes from the structure by invoking getter methods like:
data.magic # => get magic
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
# type: ignore
import kaitaistruct
from kaitaistruct import KaitaiStruct, KaitaiStream, BytesIO
from enum import IntEnum
if getattr(kaitaistruct, 'API_VERSION', (0, 9)) < (0, 11):
raise Exception("Incompatible Kaitai Struct Python API: 0.11 or later is required, but you have %s" % (kaitaistruct.__version__))
class MozillaMar(KaitaiStruct):
"""Mozilla ARchive file is Mozilla's own archive format to distribute software updates.
Test files can be found on Mozilla's FTP site, for example:
<http://ftp.mozilla.org/pub/firefox/nightly/partials/>
.. seealso::
Source - https://wiki.mozilla.org/Software_Update:MAR
"""
class BlockIdentifiers(IntEnum):
product_information = 1
class SignatureAlgorithms(IntEnum):
rsa_pkcs1_sha1 = 1
rsa_pkcs1_sha384 = 2
def __init__(self, _io, _parent=None, _root=None):
super(MozillaMar, self).__init__(_io)
self._parent = _parent
self._root = _root or self
self._read()
def _read(self):
self.magic = self._io.read_bytes(4)
if not self.magic == b"\x4D\x41\x52\x31":
raise kaitaistruct.ValidationNotEqualError(b"\x4D\x41\x52\x31", self.magic, self._io, u"/seq/0")
self.ofs_index = self._io.read_u4be()
self.file_size = self._io.read_u8be()
self.len_signatures = self._io.read_u4be()
self.signatures = []
for i in range(self.len_signatures):
self.signatures.append(MozillaMar.Signature(self._io, self, self._root))
self.len_additional_sections = self._io.read_u4be()
self.additional_sections = []
for i in range(self.len_additional_sections):
self.additional_sections.append(MozillaMar.AdditionalSection(self._io, self, self._root))
def _fetch_instances(self):
pass
for i in range(len(self.signatures)):
pass
self.signatures[i]._fetch_instances()
for i in range(len(self.additional_sections)):
pass
self.additional_sections[i]._fetch_instances()
_ = self.index
if hasattr(self, '_m_index'):
pass
self._m_index._fetch_instances()
class AdditionalSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
super(MozillaMar.AdditionalSection, self).__init__(_io)
self._parent = _parent
self._root = _root
self._read()
def _read(self):
self.len_block = self._io.read_u4be()
self.block_identifier = KaitaiStream.resolve_enum(MozillaMar.BlockIdentifiers, self._io.read_u4be())
_on = self.block_identifier
if _on == MozillaMar.BlockIdentifiers.product_information:
pass
self._raw_bytes = self._io.read_bytes((self.len_block - 4) - 4)
_io__raw_bytes = KaitaiStream(BytesIO(self._raw_bytes))
self.bytes = MozillaMar.ProductInformationBlock(_io__raw_bytes, self, self._root)
else:
pass
self.bytes = self._io.read_bytes((self.len_block - 4) - 4)
def _fetch_instances(self):
pass
_on = self.block_identifier
if _on == MozillaMar.BlockIdentifiers.product_information:
pass
self.bytes._fetch_instances()
else:
pass
class IndexEntries(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
super(MozillaMar.IndexEntries, self).__init__(_io)
self._parent = _parent
self._root = _root
self._read()
def _read(self):
self.index_entry = []
i = 0
while not self._io.is_eof():
self.index_entry.append(MozillaMar.IndexEntry(self._io, self, self._root))
i += 1
def _fetch_instances(self):
pass
for i in range(len(self.index_entry)):
pass
self.index_entry[i]._fetch_instances()
class IndexEntry(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
super(MozillaMar.IndexEntry, self).__init__(_io)
self._parent = _parent
self._root = _root
self._read()
def _read(self):
self.ofs_content = self._io.read_u4be()
self.len_content = self._io.read_u4be()
self.flags = self._io.read_u4be()
self.file_name = (self._io.read_bytes_term(0, False, True, True)).decode(u"UTF-8")
def _fetch_instances(self):
pass
_ = self.body
if hasattr(self, '_m_body'):
pass
@property
def body(self):
if hasattr(self, '_m_body'):
return self._m_body
io = self._root._io
_pos = io.pos()
io.seek(self.ofs_content)
self._m_body = io.read_bytes(self.len_content)
io.seek(_pos)
return getattr(self, '_m_body', None)
class MarIndex(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
super(MozillaMar.MarIndex, self).__init__(_io)
self._parent = _parent
self._root = _root
self._read()
def _read(self):
self.len_index = self._io.read_u4be()
self._raw_index_entries = self._io.read_bytes(self.len_index)
_io__raw_index_entries = KaitaiStream(BytesIO(self._raw_index_entries))
self.index_entries = MozillaMar.IndexEntries(_io__raw_index_entries, self, self._root)
def _fetch_instances(self):
pass
self.index_entries._fetch_instances()
class ProductInformationBlock(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
super(MozillaMar.ProductInformationBlock, self).__init__(_io)
self._parent = _parent
self._root = _root
self._read()
def _read(self):
self.mar_channel_name = (KaitaiStream.bytes_terminate(self._io.read_bytes(64), 0, False)).decode(u"UTF-8")
self.product_version = (KaitaiStream.bytes_terminate(self._io.read_bytes(32), 0, False)).decode(u"UTF-8")
def _fetch_instances(self):
pass
class Signature(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
super(MozillaMar.Signature, self).__init__(_io)
self._parent = _parent
self._root = _root
self._read()
def _read(self):
self.algorithm = KaitaiStream.resolve_enum(MozillaMar.SignatureAlgorithms, self._io.read_u4be())
self.len_signature = self._io.read_u4be()
self.signature = self._io.read_bytes(self.len_signature)
def _fetch_instances(self):
pass
@property
def index(self):
if hasattr(self, '_m_index'):
return self._m_index
_pos = self._io.pos()
self._io.seek(self.ofs_index)
self._m_index = MozillaMar.MarIndex(self._io, self, self._root)
self._io.seek(_pos)
return getattr(self, '_m_index', None)