This parser is for the RPM version 3 file format which is the current version of the file format used by RPM 2.1 and later (including RPM version 4.x, which is the current version of the RPM tool). There are historical versions of the RPM file format, as well as a currently abandoned fork (rpm5). These formats are not covered by this specification.
This page hosts a formal specification of RPM package file 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 = Rpm.from_file("path/to/local/file.rpm")
Or parse structure from a bytes:
from kaitaistruct import KaitaiStream, BytesIO
raw = b"\x00\x01\x02..."
data = Rpm(KaitaiStream(BytesIO(raw)))
After that, one can get various attributes from the structure by invoking getter methods like:
data.lead # => get lead
# 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
from enum import Enum
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 Rpm(KaitaiStruct):
"""This parser is for the RPM version 3 file format which is the current version
of the file format used by RPM 2.1 and later (including RPM version 4.x, which
is the current version of the RPM tool). There are historical versions of the
RPM file format, as well as a currently abandoned fork (rpm5). These formats
are not covered by this specification.
.. seealso::
Source - https://github.com/rpm-software-management/rpm/blob/afad3167/docs/manual/format.md
.. seealso::
Source - https://github.com/rpm-software-management/rpm/blob/afad3167/docs/manual/tags.md
.. seealso::
Source - https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/pkgformat.html
.. seealso::
Source - http://ftp.rpm.org/max-rpm/
"""
class OperatingSystems(Enum):
linux = 1
irix = 2
no_os = 255
class SignatureTags(Enum):
signatures = 62
header_immutable = 63
i18n_table = 100
bad_sha1_1_obsolete = 264
bad_sha1_2_obsolete = 265
dsa = 267
rsa = 268
sha1 = 269
long_size = 270
long_archive_size = 271
sha256 = 273
file_signatures = 274
file_signature_length = 275
verity_signatures = 276
verity_signature_algo = 277
size = 1000
le_md5_1_obsolete = 1001
pgp = 1002
le_md5_2_obsolete = 1003
md5 = 1004
gpg = 1005
pgp5_obsolete = 1006
payload_size = 1007
reserved_space = 1008
class RecordTypes(Enum):
not_implemented = 0
char = 1
uint8 = 2
uint16 = 3
uint32 = 4
uint64 = 5
string = 6
bin = 7
string_array = 8
i18n_string = 9
class HeaderTags(Enum):
signatures = 62
header_immutable = 63
i18n_table = 100
name = 1000
version = 1001
release = 1002
epoch = 1003
summary = 1004
description = 1005
build_time = 1006
build_host = 1007
install_time = 1008
size = 1009
distribution = 1010
vendor = 1011
gif_obsolete = 1012
xpm_obsolete = 1013
license = 1014
packager = 1015
group = 1016
changelog_internal = 1017
source = 1018
patch = 1019
url = 1020
os = 1021
arch = 1022
pre_install_scriptlet = 1023
post_install_scriptlet = 1024
pre_uninstall_scriptlet = 1025
post_uninstall_scriptlet = 1026
old_file_names_obsolete = 1027
file_sizes = 1028
file_states = 1029
file_modes = 1030
file_uids_internal = 1031
file_gids_internal = 1032
device_number = 1033
mtimes = 1034
file_digests = 1035
link_tos = 1036
file_flags = 1037
root_internal = 1038
file_owner = 1039
file_group = 1040
exclude_internal = 1041
exclusive_internal = 1042
icon_obsolete = 1043
source_rpm = 1044
file_verify_flags = 1045
archive_size = 1046
provide_name = 1047
require_flags = 1048
require_name = 1049
require_version = 1050
no_source = 1051
no_patch = 1052
conflict_flags = 1053
conflict_name = 1054
conflict_version = 1055
default_prefix_internal = 1056
build_root_internal = 1057
install_prefix_internal = 1058
exclude_arch = 1059
exclude_os = 1060
exclusive_arch = 1061
exclusive_os = 1062
autoreqprov_internal = 1063
rpm_version = 1064
trigger_scripts = 1065
trigger_name = 1066
trigger_version = 1067
trigger_flags = 1068
trigger_index = 1069
verify_script = 1079
changelog_time = 1080
changelog_name = 1081
changelog_text = 1082
broken_md5_internal = 1083
prereq_internal = 1084
pre_install_interpreter = 1085
post_install_interpreter = 1086
pre_uninstall_interpreter = 1087
post_uninstall_interpreter = 1088
build_archs = 1089
obsolete_name = 1090
verify_script_prog = 1091
trigger_script_prog = 1092
doc_dir_internal = 1093
cookie = 1094
file_devices = 1095
file_inodes = 1096
file_langs = 1097
prefixes = 1098
install_prefixes = 1099
trigger_install_internal = 1100
trigger_uninstall_internal = 1101
trigger_post_uninstall_internal = 1102
autoreq_internal = 1103
autoprov_internal = 1104
capability_internal = 1105
source_package = 1106
old_orig_filenames_internal = 1107
build_prereq_internal = 1108
build_requires_internal = 1109
build_conflicts_internal = 1110
build_macros_internal = 1111
provide_flags = 1112
provide_version = 1113
obsolete_flags = 1114
obsolete_version = 1115
dir_indexes = 1116
base_names = 1117
dir_names = 1118
orig_dir_indexes = 1119
orig_base_names = 1120
orig_dir_names = 1121
opt_flags = 1122
dist_url = 1123
payload_format = 1124
payload_compressor = 1125
payload_flags = 1126
install_color = 1127
install_tid = 1128
remove_tid_obsolete = 1129
sha1_rhn_internal = 1130
rhn_platform_internal = 1131
platform = 1132
patches_name_obsolete = 1133
patches_flags_obsolete = 1134
patches_version_obsolete = 1135
cache_ctime_internal = 1136
cache_pkg_path_internal = 1137
cache_pkg_size_internal = 1138
cache_pkg_mtime_internal = 1139
file_colors = 1140
file_class = 1141
class_dict = 1142
file_depends_idx = 1143
file_depends_num = 1144
depends_dict = 1145
source_pkgid = 1146
file_contexts_obsolete = 1147
fs_contexts_obsolete = 1148
re_contexts_obsolete = 1149
policies = 1150
pre_trans = 1151
post_trans = 1152
pre_trans_prog = 1153
post_trans_prog = 1154
dist_tag = 1155
old_suggests_name_obsolete = 1156
old_suggests_version_obsolete = 1157
old_suggests_flags_obsolete = 1158
old_enhances_name_obsolete = 1159
old_enhances_version_obsolete = 1160
old_enhances_flags_obsolete = 1161
priority_unimplemented = 1162
cvsid_unimplemented = 1163
blink_pkgid_unimplemented = 1164
blink_hdrid_unimplemented = 1165
blink_nevra_unimplemented = 1166
flink_pkgid_unimplemented = 1167
flink_hdrid_unimplemented = 1168
flink_nevra_unimplemented = 1169
package_origin_unimplemented = 1170
trigger_pre_install_internal = 1171
build_suggests_unimplemented = 1172
build_enhances_unimplemented = 1173
script_states_unimplemented = 1174
script_metrics_unimplemented = 1175
build_cpu_clock_unimplemented = 1176
file_digest_algos_unimplemented = 1177
variants_unimplemented = 1178
xmajor_unimplemented = 1179
xminor_unimplemented = 1180
repo_tag_unimplemented = 1181
keywords_unimplemented = 1182
build_platforms_unimplemented = 1183
package_color_unimplemented = 1184
package_pref_color_unimplemented = 1185
xattrs_dict_unimplemented = 1186
filex_attrsx_unimplemented = 1187
dep_attrs_dict_unimplemented = 1188
conflict_attrsx_unimplemented = 1189
obsolete_attrsx_unimplemented = 1190
provide_attrsx_unimplemented = 1191
require_attrsx_unimplemented = 1192
build_provides_unimplemented = 1193
build_obsoletes_unimplemented = 1194
db_instance = 1195
nvra = 1196
file_names = 5000
file_provide = 5001
file_require = 5002
fs_names_unimplemented = 5003
fs_sizes_unimplemented = 5004
trigger_conds = 5005
trigger_type = 5006
orig_file_names = 5007
long_file_sizes = 5008
long_size = 5009
file_caps = 5010
file_digest_algo = 5011
bug_url = 5012
evr = 5013
nvr = 5014
nevr = 5015
nevra = 5016
header_color = 5017
verbose = 5018
epoch_num = 5019
pre_install_flags = 5020
post_install_flags = 5021
pre_uninstall_flags = 5022
post_uninstall_flags = 5023
pre_trans_flags = 5024
post_trans_flags = 5025
verify_script_flags = 5026
trigger_script_flags = 5027
collections_unimplemented = 5029
policy_names = 5030
policy_types = 5031
policy_types_indexes = 5032
policy_flags = 5033
vcs = 5034
order_name = 5035
order_version = 5036
order_flags = 5037
mssf_manifest_unimplemented = 5038
mssf_domain_unimplemented = 5039
inst_file_names = 5040
require_nevrs = 5041
provide_nevrs = 5042
obsolete_nevrs = 5043
conflict_nevrs = 5044
file_nlinks = 5045
recommend_name = 5046
recommend_version = 5047
recommend_flags = 5048
suggest_name = 5049
suggest_version = 5050
suggest_flags = 5051
supplement_name = 5052
supplement_version = 5053
supplement_flags = 5054
enhance_name = 5055
enhance_version = 5056
enhance_flags = 5057
recommend_nevrs = 5058
suggest_nevrs = 5059
supplement_nevrs = 5060
enhance_nevrs = 5061
encoding = 5062
file_trigger_install_internal = 5063
file_trigger_uninstall_internal = 5064
file_trigger_post_uninstall_internal = 5065
file_trigger_scripts = 5066
file_trigger_script_prog = 5067
file_trigger_script_flags = 5068
file_trigger_name = 5069
file_trigger_index = 5070
file_trigger_version = 5071
file_trigger_flags = 5072
trans_file_trigger_install_internal = 5073
trans_file_trigger_uninstall_internal = 5074
trans_file_trigger_post_uninstall_internal = 5075
trans_file_trigger_scripts = 5076
trans_file_trigger_script_prog = 5077
trans_file_trigger_script_flags = 5078
trans_file_trigger_name = 5079
trans_file_trigger_index = 5080
trans_file_trigger_version = 5081
trans_file_trigger_flags = 5082
remove_path_postfixes_internal = 5083
file_trigger_priorities = 5084
trans_file_trigger_priorities = 5085
file_trigger_conds = 5086
file_trigger_type = 5087
trans_file_trigger_conds = 5088
trans_file_trigger_type = 5089
file_signatures = 5090
file_signature_length = 5091
payload_digest = 5092
payload_digest_algo = 5093
auto_installed_unimplemented = 5094
identity_unimplemented = 5095
modularity_label = 5096
payload_digest_alt = 5097
arch_suffix = 5098
spec = 5099
translation_url = 5100
upstream_releases = 5101
source_license_internal = 5102
pre_untrans = 5103
post_untrans = 5104
pre_untrans_prog = 5105
post_untrans_prog = 5106
pre_untrans_flags = 5107
post_untrans_flags = 5108
sys_users = 5109
class RpmTypes(Enum):
binary = 0
source = 1
class Architectures(Enum):
x86 = 1
alpha = 2
sparc = 3
mips = 4
ppc = 5
m68k = 6
sgi = 7
rs6000 = 8
ia64 = 9
sparc64 = 10
mips64 = 11
arm = 12
m68k_mint = 13
s390 = 14
s390x = 15
ppc64 = 16
sh = 17
xtensa = 18
aarch64 = 19
mips_r6 = 20
mips64_r6 = 21
riscv = 22
loongarch64 = 23
no_arch = 255
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.lead = Rpm.Lead(self._io, self, self._root)
self.signature = Rpm.Header(True, self._io, self, self._root)
self.signature_padding = self._io.read_bytes((-(self._io.pos()) % 8))
if self.ofs_header < 0:
self._unnamed3 = self._io.read_bytes(0)
self.header = Rpm.Header(False, self._io, self, self._root)
if self.ofs_payload < 0:
self._unnamed5 = self._io.read_bytes(0)
self.signature_tags_steps = []
for i in range(self.signature.header_record.num_index_records):
self.signature_tags_steps.append(Rpm.SignatureTagsStep(i, (-1 if i < 1 else self.signature_tags_steps[(i - 1)].size_tag_idx), self._io, self, self._root))
class RecordTypeStringArray(KaitaiStruct):
def __init__(self, num_values, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self.num_values = num_values
self._read()
def _read(self):
self.values = []
for i in range(self.num_values):
self.values.append((self._io.read_bytes_term(0, False, True, True)).decode(u"UTF-8"))
class Lead(KaitaiStruct):
"""In 2021, Panu Matilainen (a RPM developer) [described this
structure](https://github.com/kaitai-io/kaitai_struct_formats/pull/469#discussion_r718288192)
as follows:
> The lead as a structure is 25 years obsolete, the data there is
> meaningless. Seriously. Except to check for the magic to detect that
> it's an rpm file in the first place, just ignore everything in it.
> Literally everything.
The fields with `valid` constraints are important, because these are the
same validations that RPM does (which means that any valid `.rpm` file
must pass them), but otherwise you should not make decisions based on the
values given here.
"""
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(4)
if not self.magic == b"\xED\xAB\xEE\xDB":
raise kaitaistruct.ValidationNotEqualError(b"\xED\xAB\xEE\xDB", self.magic, self._io, u"/types/lead/seq/0")
self.version = Rpm.RpmVersion(self._io, self, self._root)
self.type = KaitaiStream.resolve_enum(Rpm.RpmTypes, self._io.read_u2be())
self.architecture = KaitaiStream.resolve_enum(Rpm.Architectures, self._io.read_u2be())
self.package_name = (KaitaiStream.bytes_terminate(self._io.read_bytes(66), 0, False)).decode(u"UTF-8")
self.os = KaitaiStream.resolve_enum(Rpm.OperatingSystems, self._io.read_u2be())
self.signature_type = self._io.read_u2be()
if not self.signature_type == 5:
raise kaitaistruct.ValidationNotEqualError(5, self.signature_type, self._io, u"/types/lead/seq/6")
self.reserved = self._io.read_bytes(16)
class RecordTypeString(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.values = []
for i in range(1):
self.values.append((self._io.read_bytes_term(0, False, True, True)).decode(u"UTF-8"))
class SignatureTagsStep(KaitaiStruct):
def __init__(self, idx, prev_size_tag_idx, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self.idx = idx
self.prev_size_tag_idx = prev_size_tag_idx
self._read()
def _read(self):
pass
@property
def size_tag_idx(self):
if hasattr(self, '_m_size_tag_idx'):
return self._m_size_tag_idx
self._m_size_tag_idx = (self.prev_size_tag_idx if self.prev_size_tag_idx != -1 else (self.idx if ((self._parent.signature.index_records[self.idx].signature_tag == Rpm.SignatureTags.size) and (self._parent.signature.index_records[self.idx].record_type == Rpm.RecordTypes.uint32) and (self._parent.signature.index_records[self.idx].num_values >= 1)) else -1))
return getattr(self, '_m_size_tag_idx', None)
class RecordTypeUint32(KaitaiStruct):
def __init__(self, num_values, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self.num_values = num_values
self._read()
def _read(self):
self.values = []
for i in range(self.num_values):
self.values.append(self._io.read_u4be())
class RecordTypeUint16(KaitaiStruct):
def __init__(self, num_values, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self.num_values = num_values
self._read()
def _read(self):
self.values = []
for i in range(self.num_values):
self.values.append(self._io.read_u2be())
class HeaderIndexRecord(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.tag_raw = self._io.read_u4be()
self.record_type = KaitaiStream.resolve_enum(Rpm.RecordTypes, self._io.read_u4be())
self.ofs_body = self._io.read_u4be()
self.count = self._io.read_u4be()
@property
def num_values(self):
if hasattr(self, '_m_num_values'):
return self._m_num_values
if self.record_type != Rpm.RecordTypes.bin:
self._m_num_values = self.count
return getattr(self, '_m_num_values', None)
@property
def body(self):
if hasattr(self, '_m_body'):
return self._m_body
io = self._parent.storage_section._io
_pos = io.pos()
io.seek(self.ofs_body)
_on = self.record_type
if _on == Rpm.RecordTypes.uint32:
self._m_body = Rpm.RecordTypeUint32(self.num_values, io, self, self._root)
elif _on == Rpm.RecordTypes.uint64:
self._m_body = Rpm.RecordTypeUint64(self.num_values, io, self, self._root)
elif _on == Rpm.RecordTypes.bin:
self._m_body = Rpm.RecordTypeBin(self.len_value, io, self, self._root)
elif _on == Rpm.RecordTypes.string:
self._m_body = Rpm.RecordTypeString(io, self, self._root)
elif _on == Rpm.RecordTypes.uint8:
self._m_body = Rpm.RecordTypeUint8(self.num_values, io, self, self._root)
elif _on == Rpm.RecordTypes.i18n_string:
self._m_body = Rpm.RecordTypeStringArray(self.num_values, io, self, self._root)
elif _on == Rpm.RecordTypes.uint16:
self._m_body = Rpm.RecordTypeUint16(self.num_values, io, self, self._root)
elif _on == Rpm.RecordTypes.char:
self._m_body = Rpm.RecordTypeUint8(self.num_values, io, self, self._root)
elif _on == Rpm.RecordTypes.string_array:
self._m_body = Rpm.RecordTypeStringArray(self.num_values, io, self, self._root)
io.seek(_pos)
return getattr(self, '_m_body', None)
@property
def signature_tag(self):
if hasattr(self, '_m_signature_tag'):
return self._m_signature_tag
if self._parent.is_signature:
self._m_signature_tag = KaitaiStream.resolve_enum(Rpm.SignatureTags, self.tag_raw)
return getattr(self, '_m_signature_tag', None)
@property
def len_value(self):
if hasattr(self, '_m_len_value'):
return self._m_len_value
if self.record_type == Rpm.RecordTypes.bin:
self._m_len_value = self.count
return getattr(self, '_m_len_value', None)
@property
def header_tag(self):
if hasattr(self, '_m_header_tag'):
return self._m_header_tag
if self._parent.is_header:
self._m_header_tag = KaitaiStream.resolve_enum(Rpm.HeaderTags, self.tag_raw)
return getattr(self, '_m_header_tag', None)
class RpmVersion(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.major = self._io.read_u1()
if not self.major >= 3:
raise kaitaistruct.ValidationLessThanError(3, self.major, self._io, u"/types/rpm_version/seq/0")
if not self.major <= 4:
raise kaitaistruct.ValidationGreaterThanError(4, self.major, self._io, u"/types/rpm_version/seq/0")
self.minor = self._io.read_u1()
class Dummy(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):
pass
class RecordTypeUint8(KaitaiStruct):
def __init__(self, num_values, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self.num_values = num_values
self._read()
def _read(self):
self.values = []
for i in range(self.num_values):
self.values.append(self._io.read_u1())
class RecordTypeUint64(KaitaiStruct):
def __init__(self, num_values, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self.num_values = num_values
self._read()
def _read(self):
self.values = []
for i in range(self.num_values):
self.values.append(self._io.read_u8be())
class RecordTypeBin(KaitaiStruct):
def __init__(self, len_value, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self.len_value = len_value
self._read()
def _read(self):
self.values = []
for i in range(1):
self.values.append(self._io.read_bytes(self.len_value))
class HeaderRecord(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.magic = self._io.read_bytes(4)
if not self.magic == b"\x8E\xAD\xE8\x01":
raise kaitaistruct.ValidationNotEqualError(b"\x8E\xAD\xE8\x01", self.magic, self._io, u"/types/header_record/seq/0")
self.reserved = self._io.read_bytes(4)
if not self.reserved == b"\x00\x00\x00\x00":
raise kaitaistruct.ValidationNotEqualError(b"\x00\x00\x00\x00", self.reserved, self._io, u"/types/header_record/seq/1")
self.num_index_records = self._io.read_u4be()
if not self.num_index_records >= 1:
raise kaitaistruct.ValidationLessThanError(1, self.num_index_records, self._io, u"/types/header_record/seq/2")
self.len_storage_section = self._io.read_u4be()
class Header(KaitaiStruct):
"""header structure used for both the "header" and "signature", but some tag
values have different meanings in signature and header (hence they use
different enums)
"""
def __init__(self, is_signature, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self.is_signature = is_signature
self._read()
def _read(self):
self.header_record = Rpm.HeaderRecord(self._io, self, self._root)
self.index_records = []
for i in range(self.header_record.num_index_records):
self.index_records.append(Rpm.HeaderIndexRecord(self._io, self, self._root))
self._raw_storage_section = self._io.read_bytes(self.header_record.len_storage_section)
_io__raw_storage_section = KaitaiStream(BytesIO(self._raw_storage_section))
self.storage_section = Rpm.Dummy(_io__raw_storage_section, self, self._root)
@property
def is_header(self):
if hasattr(self, '_m_is_header'):
return self._m_is_header
self._m_is_header = not (self.is_signature)
return getattr(self, '_m_is_header', None)
@property
def has_signature_size_tag(self):
if hasattr(self, '_m_has_signature_size_tag'):
return self._m_has_signature_size_tag
self._m_has_signature_size_tag = self.signature_tags_steps[-1].size_tag_idx != -1
return getattr(self, '_m_has_signature_size_tag', None)
@property
def signature_size_tag(self):
if hasattr(self, '_m_signature_size_tag'):
return self._m_signature_size_tag
if self.has_signature_size_tag:
self._m_signature_size_tag = self.signature.index_records[self.signature_tags_steps[-1].size_tag_idx]
return getattr(self, '_m_signature_size_tag', None)
@property
def len_payload(self):
if hasattr(self, '_m_len_payload'):
return self._m_len_payload
if self.has_signature_size_tag:
self._m_len_payload = (self.signature_size_tag.body.values[0] - self.len_header)
return getattr(self, '_m_len_payload', None)
@property
def payload(self):
if hasattr(self, '_m_payload'):
return self._m_payload
if self.has_signature_size_tag:
_pos = self._io.pos()
self._io.seek(self.ofs_payload)
self._m_payload = self._io.read_bytes(self.len_payload)
self._io.seek(_pos)
return getattr(self, '_m_payload', None)
@property
def len_header(self):
if hasattr(self, '_m_len_header'):
return self._m_len_header
self._m_len_header = (self.ofs_payload - self.ofs_header)
return getattr(self, '_m_len_header', None)
@property
def ofs_header(self):
if hasattr(self, '_m_ofs_header'):
return self._m_ofs_header
self._m_ofs_header = self._io.pos()
return getattr(self, '_m_ofs_header', None)
@property
def ofs_payload(self):
if hasattr(self, '_m_ofs_payload'):
return self._m_ofs_payload
self._m_ofs_payload = self._io.pos()
return getattr(self, '_m_ofs_payload', None)