晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/fwupd/add_capsule_header.py
#!/usr/libexec/platform-python
#
# 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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