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add_capsule_header.py
#!/usr/bin/python3 # # Copyright (C) 2019 Richard Hughes <richard@hughsie.com> # # SPDX-License-Identifier: LGPL-2.1+ import sys import uuid import argparse import ctypes CAPSULE_FLAGS_PERSIST_ACROSS_RESET = 0x00010000 CAPSULE_FLAGS_POPULATE_SYSTEM_TABLE = 0x00020000 CAPSULE_FLAGS_INITIATE_RESET = 0x00040000 def add_header(infile, outfile, gd, fl=None): # parse GUID from command line try: guid = uuid.UUID(gd) except ValueError as e: print(e) return 1 import struct try: with open(infile, 'rb') as f: bin_data = f.read() except FileNotFoundError as e: print(e) return 1 # check if already has header hdrsz = struct.calcsize('<16sIII') if len(bin_data) >= hdrsz: hdr = struct.unpack('<16sIII', bin_data[:hdrsz]) imgsz = hdr[3] if imgsz == len(bin_data): print('Replacing existing CAPSULE_HEADER of:') guid_mixed = uuid.UUID(bytes_le=hdr[0]) hdrsz_old = hdr[1] flags = hdr[2] print('GUID: %s' % guid_mixed) print('HdrSz: 0x%04x' % hdrsz_old) print('Flags: 0x%04x' % flags) print('PayloadSz: 0x%04x' % imgsz) bin_data = bin_data[hdrsz_old:] # set header flags flags = ( CAPSULE_FLAGS_PERSIST_ACROSS_RESET | CAPSULE_FLAGS_INITIATE_RESET | CAPSULE_FLAGS_POPULATE_SYSTEM_TABLE ) if fl: flags = int(fl, 16) # build update capsule header hdrsz = 4096 imgsz = hdrsz + len(bin_data) hdr = ctypes.create_string_buffer(hdrsz) struct.pack_into('<16sIII', hdr, 0, guid.bytes_le, hdrsz, flags, imgsz) with open(outfile, 'wb') as f: f.write(hdr) f.write(bin_data) print('Wrote capsule %s' % outfile) print('GUID: %s' % guid) print('HdrSz: 0x%04x' % hdrsz) print('Flags: 0x%04x' % flags) print('PayloadSz: 0x%04x' % imgsz) return 0 if __name__ == '__main__': parser = argparse.ArgumentParser(description='Add capsule header on firmware') parser.add_argument('--guid', help='GUID of the device', required=True) parser.add_argument('--bin', help='Path to the .bin file', required=True) parser.add_argument('--cap', help='Output capsule file path', required=True) parser.add_argument('--flags', help='Flags, e.g. 0x40000', default=None) args = parser.parse_args() sys.exit(add_header(args.bin, args.cap, args.guid, args.flags))
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