mirror of https://github.com/CalyxOS/scripts
106 lines
2.9 KiB
Python
106 lines
2.9 KiB
Python
# Copyright 2021 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import collections
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#from google3.third_party.devsite.androidsource.en.docs.core.architecture.bootloader.tools.pixel.fw_unpack import packedstruct
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import packedstruct
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FBPACK_MAGIC = 0x4b504246 # "FBPK" FastBook PacK
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FBPACK_VERSION = 2
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FBPACK_DEFAULT_DATA_ALIGN = 16
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FBPACK_PARTITION_TABLE = 0
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FBPACK_PARTITION_DATA = 1
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FBPACK_SIDELOAD_DATA = 2
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class PackEntry(packedstruct.PackedStruct):
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"""Pack entry info."""
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type: int
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name: bytes
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product: bytes
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offset: int
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size: int
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slotted: int
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crc32: int
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_FIELDS = collections.OrderedDict([
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('type', 'I'),
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('name', '36s'),
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('product', '40s'),
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('offset', 'Q'),
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('size', 'Q'),
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('slotted', 'I'),
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('crc32', 'I'),
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])
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# Provide defaults.
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# pylint: disable=useless-super-delegation
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def __init__(self,
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type_=0,
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name=b'',
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prod=b'',
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offset=0,
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size=0,
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slotted=0,
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crc32=0):
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super(PackEntry, self).__init__(type_, name, prod, offset, size, slotted,
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crc32)
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class PackHeader(packedstruct.PackedStruct):
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""" A packed image representation"""
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magic: int
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version: int
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header_size: int
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entry_header_size: int
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platform: bytes
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pack_version: bytes
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slot_type: int
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data_align: int
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total_entries: int
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total_size: int
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_FIELDS = collections.OrderedDict([
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('magic', 'I'),
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('version', 'I'),
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('header_size', 'I'),
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('entry_header_size', 'I'),
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('platform', '16s'),
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('pack_version', '64s'),
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('slot_type', 'I'),
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('data_align', 'I'),
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('total_entries', 'I'),
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('total_size', 'I'),
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])
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def __init__(self,
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magic=FBPACK_MAGIC,
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version=FBPACK_VERSION,
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header_size=0,
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entry_header_size=len(PackEntry()),
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platform=b'',
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pack_version=b'',
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slot_type=0,
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data_align=FBPACK_DEFAULT_DATA_ALIGN,
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total_entries=0,
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total_size=0):
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super(PackHeader,
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self).__init__(magic, version, header_size, entry_header_size,
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platform, pack_version, slot_type, data_align,
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total_entries, total_size)
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# update header size once we know all fields
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self.header_size = len(self)
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