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scripts: add cameo image header generator
The cameo header is a 0x40-byte header used by D-Link DGS 1210 switches and Apresia ApresiaLightGS series. cameo-imghdr.py is a clean-room reimplementation of imghdr present in the DGS-1210-28-GPL package. Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> [fix board_version argument's help text] Signed-off-by: Sander Vanheule <sander@svanheule.net>
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#!/usr/bin/python3 | ||
# SPDX-License-Identifier: GPL-2.0-or-later | ||
# | ||
# Copyright (C) 2022 Luiz Angelo Daros de Luca <luizluca@gmail.com> | ||
# | ||
# Cameo Image header geneator, used by some D-Link DGS-1210 switches | ||
# and APRESIA ApresiaLightGS series | ||
# | ||
import argparse | ||
import pathlib | ||
import socket | ||
import struct | ||
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MODEL_LEN = 20 | ||
SIGNATURE_LEN = 16 | ||
LINUXLOAD_LEN = 10 | ||
BUFSIZE = 4096 | ||
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parser = argparse.ArgumentParser(description='Generate Cameo firmware header.') | ||
parser.add_argument('source_file', type=argparse.FileType('rb')) | ||
parser.add_argument('dest_file', type=argparse.FileType('wb')) | ||
parser.add_argument('model') | ||
parser.add_argument('signature') | ||
parser.add_argument('partition', type=int, choices=range(0,10), | ||
metavar="partition=[0-9]",help="partition id") | ||
parser.add_argument('customer_signature', type=int, choices=range(0,10), | ||
metavar="customer_signature=[0-9]", | ||
help="customer signature") | ||
parser.add_argument('board_version', type=int, choices=range(0,2**32), | ||
metavar="board_version=[0-4294967295]", | ||
help="board version") | ||
parser.add_argument('linux_loadaddr', nargs='?', | ||
help="Kernel start address in 0xFFFFFFFF format") | ||
args = parser.parse_args() | ||
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if len(args.model) > MODEL_LEN: | ||
raise ValueError(f"Model '{args.model}' is greater than {MODEL_LEN} bytes") | ||
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if len(args.signature) > SIGNATURE_LEN: | ||
raise ValueError(f"Signature '{args.signature}' is greater than" | ||
f"{SIGNATURE_LEN} bytes") | ||
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if args.signature == "os": | ||
if args.linux_loadaddr: | ||
if len(args.linux_loadaddr) > LINUXLOAD_LEN: | ||
raise ValueError(f"linux_loadaddr '{args.linux_loadaddr}' is greater" | ||
f"than {LINUXLOAD_LEN} bytes") | ||
if (args.linux_loadaddr[0:2] != "0x"): | ||
raise ValueError(f"linux_loadaddr '{args.linux_loadaddr}' must use" | ||
f"the 0x789ABCDE format") | ||
int(args.linux_loadaddr[2:],16) | ||
else: | ||
raise ValueError(f"linux_loadaddr is required for signature 'os'") | ||
else: | ||
args.linux_loadaddr = "" | ||
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checksum = 0 | ||
size = 0 | ||
while True: | ||
buf = args.source_file.read(BUFSIZE) | ||
if not buf: | ||
break | ||
checksum = sum(iter(buf),checksum) % (1<<32) | ||
size += len(buf) | ||
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args.dest_file.write(struct.pack('!I', checksum)) | ||
args.dest_file.write(struct.pack(f'{MODEL_LEN}s', | ||
args.model.encode("ascii"))) | ||
args.dest_file.write(struct.pack(f'{SIGNATURE_LEN}s', | ||
args.signature.encode("ascii"))) | ||
args.dest_file.write(struct.pack('!B', args.partition)) | ||
args.dest_file.write(struct.pack('!B', 0x40)) # ??? This header size? | ||
args.dest_file.write(struct.pack('!B', 0x00)) # ??? Encrypted? | ||
args.dest_file.write(struct.pack('!B', args.customer_signature)) | ||
args.dest_file.write(struct.pack('!I', args.board_version)) | ||
args.dest_file.write(struct.pack('!I', size)) | ||
args.dest_file.write(struct.pack(f'{LINUXLOAD_LEN}s', | ||
args.linux_loadaddr.encode("ascii"))) | ||
args.dest_file.write(struct.pack('!2x')) | ||
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args.source_file.seek(0) | ||
while True: | ||
buf = args.source_file.read(BUFSIZE) | ||
if not buf: | ||
break | ||
args.dest_file.write(buf) |