1 # 2 # Copyright 2018 - The Android Open Source Project 3 # 4 # Licensed under the Apache License, Version 2.0 (the "License"); 5 # you may not use this file except in compliance with the License. 6 # You may obtain a copy of the License at 7 # 8 # http://www.apache.org/licenses/LICENSE-2.0 9 # 10 # Unless required by applicable law or agreed to in writing, software 11 # distributed under the License is distributed on an "AS IS" BASIS, 12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 # See the License for the specific language governing permissions and 14 # limitations under the License. 15 16 import logging 17 import struct 18 19 OS_VERSOIN_OFFSET_BOOTIMG = 44 20 SPL_YEAR_BASE_BOOTIMG = 2000 21 SPL_YEAR_MASK_BOOTIMG = 127 << 4 22 SPL_MONTH_MASK_BOOTIMG = 15 23 24 25 def GetSPLVersionFromBootImg(img_file_path): 26 """Gets SPL version from given boot.img file path. 27 28 Args: 29 img_file_path : string, path to the boot.img file. 30 Returns: 31 A dict contains SPL version's year and date value. 32 """ 33 try: 34 fo = open(img_file_path, "rb") 35 fo.seek(OS_VERSOIN_OFFSET_BOOTIMG, 0) 36 37 os_version = fo.read(4) 38 except IOError as e: 39 logging.error(e.strerror) 40 return {} 41 42 os_version_int = struct.unpack("i", os_version)[0] 43 44 year = (os_version_int & SPL_YEAR_MASK_BOOTIMG) >> 4 45 month = os_version_int & SPL_MONTH_MASK_BOOTIMG 46 47 version_date = {} 48 version_date["year"] = SPL_YEAR_BASE_BOOTIMG + year 49 version_date["month"] = month 50 51 return version_date
