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#
# Copyright 2018 - 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 logging
import struct
OS_VERSOIN_OFFSET_BOOTIMG = 44
SPL_YEAR_BASE_BOOTIMG = 2000
SPL_YEAR_MASK_BOOTIMG = 127 << 4
SPL_MONTH_MASK_BOOTIMG = 15
def GetSPLVersionFromBootImg(img_file_path):
"""Gets SPL version from given boot.img file path.
Args:
img_file_path : string, path to the boot.img file.
Returns:
A dict contains SPL version's year and date value.
"""
try:
fo = open(img_file_path, "rb")
fo.seek(OS_VERSOIN_OFFSET_BOOTIMG, 0)
os_version = fo.read(4)
except IOError as e:
logging.error(e.strerror)
return {}
os_version_int = struct.unpack("i", os_version)[0]
year = (os_version_int & SPL_YEAR_MASK_BOOTIMG) >> 4
month = os_version_int & SPL_MONTH_MASK_BOOTIMG
version_date = {}
version_date["year"] = SPL_YEAR_BASE_BOOTIMG + year
version_date["month"] = month
return version_date
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