#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2023 Huawei Device Co., Ltd.
# 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 tarfile
import argparse
import os
import subprocess
import sys
import shutil


def untar_file(tar_file_path, extract_path):
    try:
        tar_cmd = ['tar', '-zxf', tar_file_path, '-C', extract_path]
        subprocess.run(tar_cmd, check=True)
    except Exception as e:
        print("tar error!")
        return


def move_file(src_path, dst_path):
    files = [
        "CVE-2019-6129.patch",
        "huawei_libpng_CMakeList.patch",
        "libpng-fix-arm-neon.patch",
        "libpng-multilib.patch",
        "backport-libpng-1.6.37-enable-valid.patch",
        "pnglibconf.h",
        "CVE-2018-14048.patch"
    ]
    for file in files:
        src_file = os.path.join(src_path, file)
        dst_file = os.path.join(dst_path, file)
        shutil.copy(src_file, dst_file)


def apply_patch(patch_file, target_dir):
    try:
        if not os.path.exists(target_dir):
            return
        patch_cmd = ['patch', '-p1', "--fuzz=0", "--no-backup-if-mismatch", '-i', patch_file, '-d', target_dir]
        subprocess.run(patch_cmd, check=True)
    except Exception as e:
        print("apply_patch error!")
        return


def do_patch(target_dir):
    patch_file = [
        "CVE-2019-6129.patch",
        "huawei_libpng_CMakeList.patch",
        "libpng-fix-arm-neon.patch",
        "libpng-multilib.patch",
        "backport-libpng-1.6.37-enable-valid.patch",
        "CVE-2018-14048.patch"
    ]

    for patch in patch_file:
        apply_patch(patch, target_dir)


def main():
    libpng_path = argparse.ArgumentParser()
    libpng_path.add_argument('--gen-dir', help='generate path of log', required=True)
    libpng_path.add_argument('--source-dir', help='generate path of log', required=True)
    args = libpng_path.parse_args()
    tar_file_path = os.path.join(args.source_dir, "libpng-1.6.38.tar.gz")
    target_dir = os.path.join(args.gen_dir, "libpng-1.6.38")

    untar_file(tar_file_path, args.gen_dir)
    move_file(args.source_dir, target_dir)
    do_patch(target_dir)
    return 0

if __name__ == '__main__':
    sys.exit(main())