86 lines
2.4 KiB
Python
86 lines
2.4 KiB
Python
|
# Copyright 2021 The Android Open Source Project
|
||
|
|
#
|
||
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
# you may not use this file except in compliance with the License.
|
||
|
|
# You may obtain a copy of the License at
|
||
|
|
#
|
||
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
#
|
||
|
|
# Unless required by applicable law or agreed to in writing, software
|
||
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
# See the License for the specific language governing permissions and
|
||
|
|
# limitations under the License.
|
||
|
|
#
|
||
|
|
import struct
|
||
|
|
from packedstruct import PackedStruct
|
||
|
|
from collections import OrderedDict
|
||
|
|
|
||
|
|
FBPACK_MAGIC = 0x4b504246 # "FBPK" FastBook PacK
|
||
|
|
FBPACK_VERSION = 2
|
||
|
|
FBPACK_DEFAULT_DATA_ALIGN = 16
|
||
|
|
|
||
|
|
FBPACK_PARTITION_TABLE = 0
|
||
|
|
FBPACK_PARTITION_DATA = 1
|
||
|
|
FBPACK_SIDELOAD_DATA = 2
|
||
|
|
|
||
|
|
|
||
|
|
class PackEntry(PackedStruct):
|
||
|
|
"""Pack entry info."""
|
||
|
|
|
||
|
|
_FIELDS = OrderedDict([
|
||
|
|
('type', 'I'),
|
||
|
|
('name', '36s'),
|
||
|
|
('product', '40s'),
|
||
|
|
('offset', 'Q'),
|
||
|
|
('size', 'Q'),
|
||
|
|
('slotted', 'I'),
|
||
|
|
('crc32', 'I'),
|
||
|
|
])
|
||
|
|
|
||
|
|
def __init__(self, type_=0, name=b'', prod=b'', offset=0, size=0, slotted=0, crc32=0):
|
||
|
|
super(PackEntry, self).__init__(type_, name, prod, offset, size, slotted, crc32)
|
||
|
|
|
||
|
|
|
||
|
|
class PackHeader(PackedStruct):
|
||
|
|
""" A packed image representation """
|
||
|
|
|
||
|
|
_FIELDS = OrderedDict([
|
||
|
|
('magic', 'I'),
|
||
|
|
('version', 'I'),
|
||
|
|
('header_size', 'I'),
|
||
|
|
('entry_header_size', 'I'),
|
||
|
|
('platform', '16s'),
|
||
|
|
('pack_version', '64s'),
|
||
|
|
('slot_type', 'I'),
|
||
|
|
('data_align', 'I'),
|
||
|
|
('total_entries', 'I'),
|
||
|
|
('total_size', 'I'),
|
||
|
|
])
|
||
|
|
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
magic=FBPACK_MAGIC,
|
||
|
|
version=FBPACK_VERSION,
|
||
|
|
header_size=0,
|
||
|
|
entry_header_size=len(PackEntry()),
|
||
|
|
platform=b'',
|
||
|
|
pack_version=b'',
|
||
|
|
slot_type=0,
|
||
|
|
data_align=FBPACK_DEFAULT_DATA_ALIGN,
|
||
|
|
total_entries=0,
|
||
|
|
total_size=0):
|
||
|
|
super(PackHeader, self).__init__(
|
||
|
|
magic,
|
||
|
|
version,
|
||
|
|
header_size,
|
||
|
|
entry_header_size,
|
||
|
|
platform,
|
||
|
|
pack_version,
|
||
|
|
slot_type,
|
||
|
|
data_align,
|
||
|
|
total_entries,
|
||
|
|
total_size)
|
||
|
|
# update header size once we know all fields
|
||
|
|
self.header_size = len(self)
|