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# 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
from enum import Enum
import collections
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 Gzip(KaitaiStruct):
"""Gzip is a popular and standard single-file archiving format. It
essentially provides a container that stores original file name,
timestamp and a few other things (like optional comment), basic
CRCs, etc, and a file compressed by a chosen compression algorithm.
As of 2019, there is actually only one working solution for
compression algorithms, so it's typically raw DEFLATE stream
(without zlib header) in all gzipped files.
.. seealso::
Source - https://tools.ietf.org/html/rfc1952
"""
class CompressionMethods(Enum):
deflate = 8
class Oses(Enum):
fat = 0
amiga = 1
vms = 2
unix = 3
vm_cms = 4
atari_tos = 5
hpfs = 6
macintosh = 7
z_system = 8
cp_m = 9
tops_20 = 10
ntfs = 11
qdos = 12
acorn_riscos = 13
unknown = 255
SEQ_FIELDS = ["magic", "compression_method", "flags", "mod_time", "extra_flags", "os", "extras", "name", "comment", "header_crc16", "body", "body_crc32", "len_uncompressed"]
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._debug = collections.defaultdict(dict)
def _read(self):
self._debug['magic']['start'] = self._io.pos()
self.magic = self._io.ensure_fixed_contents(b"\x1F\x8B")
self._debug['magic']['end'] = self._io.pos()
self._debug['compression_method']['start'] = self._io.pos()
self.compression_method = KaitaiStream.resolve_enum(self._root.CompressionMethods, self._io.read_u1())
self._debug['compression_method']['end'] = self._io.pos()
self._debug['flags']['start'] = self._io.pos()
self.flags = self._root.Flags(self._io, self, self._root)
self.flags._read()
self._debug['flags']['end'] = self._io.pos()
self._debug['mod_time']['start'] = self._io.pos()
self.mod_time = self._io.read_u4le()
self._debug['mod_time']['end'] = self._io.pos()
self._debug['extra_flags']['start'] = self._io.pos()
_on = self.compression_method
if _on == self._root.CompressionMethods.deflate:
self.extra_flags = self._root.ExtraFlagsDeflate(self._io, self, self._root)
self.extra_flags._read()
self._debug['extra_flags']['end'] = self._io.pos()
self._debug['os']['start'] = self._io.pos()
self.os = KaitaiStream.resolve_enum(self._root.Oses, self._io.read_u1())
self._debug['os']['end'] = self._io.pos()
if self.flags.has_extra:
self._debug['extras']['start'] = self._io.pos()
self.extras = self._root.Extras(self._io, self, self._root)
self.extras._read()
self._debug['extras']['end'] = self._io.pos()
if self.flags.has_name:
self._debug['name']['start'] = self._io.pos()
self.name = self._io.read_bytes_term(0, False, True, True)
self._debug['name']['end'] = self._io.pos()
if self.flags.has_comment:
self._debug['comment']['start'] = self._io.pos()
self.comment = self._io.read_bytes_term(0, False, True, True)
self._debug['comment']['end'] = self._io.pos()
if self.flags.has_header_crc:
self._debug['header_crc16']['start'] = self._io.pos()
self.header_crc16 = self._io.read_u2le()
self._debug['header_crc16']['end'] = self._io.pos()
self._debug['body']['start'] = self._io.pos()
self.body = self._io.read_bytes(((self._io.size() - self._io.pos()) - 8))
self._debug['body']['end'] = self._io.pos()
self._debug['body_crc32']['start'] = self._io.pos()
self.body_crc32 = self._io.read_u4le()
self._debug['body_crc32']['end'] = self._io.pos()
self._debug['len_uncompressed']['start'] = self._io.pos()
self.len_uncompressed = self._io.read_u4le()
self._debug['len_uncompressed']['end'] = self._io.pos()
class Flags(KaitaiStruct):
SEQ_FIELDS = ["reserved1", "has_comment", "has_name", "has_extra", "has_header_crc", "is_text"]
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._debug = collections.defaultdict(dict)
def _read(self):
self._debug['reserved1']['start'] = self._io.pos()
self.reserved1 = self._io.read_bits_int(3)
self._debug['reserved1']['end'] = self._io.pos()
self._debug['has_comment']['start'] = self._io.pos()
self.has_comment = self._io.read_bits_int(1) != 0
self._debug['has_comment']['end'] = self._io.pos()
self._debug['has_name']['start'] = self._io.pos()
self.has_name = self._io.read_bits_int(1) != 0
self._debug['has_name']['end'] = self._io.pos()
self._debug['has_extra']['start'] = self._io.pos()
self.has_extra = self._io.read_bits_int(1) != 0
self._debug['has_extra']['end'] = self._io.pos()
self._debug['has_header_crc']['start'] = self._io.pos()
self.has_header_crc = self._io.read_bits_int(1) != 0
self._debug['has_header_crc']['end'] = self._io.pos()
self._debug['is_text']['start'] = self._io.pos()
self.is_text = self._io.read_bits_int(1) != 0
self._debug['is_text']['end'] = self._io.pos()
class ExtraFlagsDeflate(KaitaiStruct):
class CompressionStrengths(Enum):
best = 2
fast = 4
SEQ_FIELDS = ["compression_strength"]
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._debug = collections.defaultdict(dict)
def _read(self):
self._debug['compression_strength']['start'] = self._io.pos()
self.compression_strength = KaitaiStream.resolve_enum(self._root.ExtraFlagsDeflate.CompressionStrengths, self._io.read_u1())
self._debug['compression_strength']['end'] = self._io.pos()
class Subfields(KaitaiStruct):
"""Container for many subfields, constrained by size of stream.
"""
SEQ_FIELDS = ["entries"]
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._debug = collections.defaultdict(dict)
def _read(self):
self._debug['entries']['start'] = self._io.pos()
self.entries = []
i = 0
while not self._io.is_eof():
if not 'arr' in self._debug['entries']:
self._debug['entries']['arr'] = []
self._debug['entries']['arr'].append({'start': self._io.pos()})
_t_entries = self._root.Subfield(self._io, self, self._root)
_t_entries._read()
self.entries.append(_t_entries)
self._debug['entries']['arr'][len(self.entries) - 1]['end'] = self._io.pos()
i += 1
self._debug['entries']['end'] = self._io.pos()
class Subfield(KaitaiStruct):
"""Every subfield follows typical [TLV scheme](https://en.wikipedia.org/wiki/Type-length-value):
* `id` serves role of "T"ype
* `len_data` serves role of "L"ength
* `data` serves role of "V"alue
This way it's possible to for arbitrary parser to skip over
subfields it does not support.
"""
SEQ_FIELDS = ["id", "len_data", "data"]
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._debug = collections.defaultdict(dict)
def _read(self):
self._debug['id']['start'] = self._io.pos()
self.id = self._io.read_u2le()
self._debug['id']['end'] = self._io.pos()
self._debug['len_data']['start'] = self._io.pos()
self.len_data = self._io.read_u2le()
self._debug['len_data']['end'] = self._io.pos()
self._debug['data']['start'] = self._io.pos()
self.data = self._io.read_bytes(self.len_data)
self._debug['data']['end'] = self._io.pos()
class Extras(KaitaiStruct):
SEQ_FIELDS = ["len_subfields", "subfields"]
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._debug = collections.defaultdict(dict)
def _read(self):
self._debug['len_subfields']['start'] = self._io.pos()
self.len_subfields = self._io.read_u2le()
self._debug['len_subfields']['end'] = self._io.pos()
self._debug['subfields']['start'] = self._io.pos()
self._raw_subfields = self._io.read_bytes(self.len_subfields)
io = KaitaiStream(BytesIO(self._raw_subfields))
self.subfields = self._root.Subfields(io, self, self._root)
self.subfields._read()
self._debug['subfields']['end'] = self._io.pos()
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