1/*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#include "diff_patch/diff_patch_interface.h"
17
18#include <array>
19#include <cstddef>
20#include <cstdint>
21#include <iostream>
22#include <string>
23#include <vector>
24#include <fstream>
25#include <cstdio>
26#include "log/log.h"
27#include <fuzzer/FuzzedDataProvider.h>
28
29using namespace Updater;
30namespace OHOS {
31    bool WriteDataToFile(const char* data, size_t size, const char* filePath, bool isAppend = false)
32    {
33        std::ofstream ofs;
34        if (isAppend) {
35            ofs.open(filePath, std::ios::app | std::ios::binary);
36        } else {
37            ofs.open(filePath, std::ios::ate | std::ios::binary);
38        }
39        if (!ofs.is_open()) {
40            LOG(ERROR) << "open " << filePath << " failed";
41            return false;
42        }
43        ofs.write(data, size);
44        ofs.close();
45        return true;
46    }
47
48    void FuzzApplyPatch(const uint8_t* data, size_t size)
49    {
50        FuzzedDataProvider fdp(data, size);
51        const int magicNumSize = 4;
52        const char* bspatchPath = "/data/applyPatchfuzzBspatch";
53        const char* imgpatchPath = "/data/applyPatchfuzzImgpatch";
54        const char* oldFilePath = "/data/applyPatchfuzzOldFile";
55        const char* newFilePath = "/data/applyPatchfuzzNewFile";
56        bool isPkgFormat = false;
57        bool ret = WriteDataToFile(reinterpret_cast<const char*>(data), size, oldFilePath);
58        isPkgFormat = fdp.ConsumeBool();
59        if (isPkgFormat) {
60            ret &= WriteDataToFile("BSDIFF40", magicNumSize, bspatchPath);
61            ret &= WriteDataToFile(reinterpret_cast<const char*>(data), size, bspatchPath, true);
62            ApplyPatch(bspatchPath, oldFilePath, newFilePath);
63        } else {
64            ret &= WriteDataToFile("PKGDIFF0", magicNumSize, imgpatchPath);
65            ret &= WriteDataToFile(reinterpret_cast<const char*>(data), size, imgpatchPath, true);
66            ApplyPatch(imgpatchPath, oldFilePath, newFilePath);
67        }
68        if (!ret) {
69            LOG(ERROR) << "an invalid fuzztest due to input file creation failure";
70        }
71    }
72}
73
74/* Fuzzer entry point */
75extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
76{
77    /* Run your code on data */
78    OHOS::FuzzApplyPatch(data, size);
79    return 0;
80}
81