mirror of
https://github.com/google/pebble.git
synced 2025-03-15 00:31:21 +00:00
60 lines
1.9 KiB
Python
60 lines
1.9 KiB
Python
#!/usr/bin/env python
|
|
# Copyright 2024 Google LLC
|
|
#
|
|
# 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.
|
|
|
|
|
|
from waflib import Logs
|
|
from zlib import crc32
|
|
from shutil import copyfile
|
|
import struct
|
|
from elftools.elf.elffile import ELFFile
|
|
|
|
TEXT_SECTION_NAME = ".text"
|
|
TEXT_CRC32_SECTION_NAME = ".text_crc32"
|
|
|
|
def wafrule(task):
|
|
in_file = task.inputs[0].abspath()
|
|
out_file = task.outputs[0].abspath()
|
|
|
|
text_data = get_text_section_data_from_file(in_file)
|
|
if not text_data:
|
|
error = 'Unable to get {} section from {}'.format(TEXT_SECTION_NAME, in_file)
|
|
Logs.pprint('RED', error)
|
|
return error
|
|
|
|
crc = crc32(text_data) & 0xFFFFFFFF
|
|
|
|
offset = get_text_crc32_section_offset_from_file(in_file)
|
|
if not offset:
|
|
error = 'Unable to get {} section from {}'.format(TEXT_CRC32_SECTION_NAME, in_file)
|
|
Logs.pprint('RED', error)
|
|
return error
|
|
|
|
copyfile(in_file, out_file)
|
|
|
|
with open(out_file, 'rb+') as file:
|
|
file.seek(offset)
|
|
file.write(struct.pack('<I', crc))
|
|
|
|
|
|
def get_text_section_data_from_file(filename):
|
|
with open(filename, 'rb') as file:
|
|
section = ELFFile(file).get_section_by_name(TEXT_SECTION_NAME)
|
|
return section.data() if section is not None else None
|
|
|
|
def get_text_crc32_section_offset_from_file(filename):
|
|
with open(filename, 'rb') as file:
|
|
section = ELFFile(file).get_section_by_name(TEXT_CRC32_SECTION_NAME)
|
|
return section['sh_offset'] if section is not None else None
|
|
|