1/*
2 * Copyright (c) 2022-2022 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 "datachannelstub_fuzzer.h"
17
18#include <cstddef>
19#include <cstdint>
20
21#include "global.h"
22#include "input_data_channel_stub.h"
23#include "message_parcel.h"
24
25using namespace OHOS::MiscServices;
26namespace OHOS {
27constexpr size_t THRESHOLD = 10;
28constexpr int32_t OFFSET = 4;
29const std::u16string DATACHANNEL_INTERFACE_TOKEN = u"ohos.miscservices.inputmethod.IInputDataChannel";
30
31uint32_t ConvertToUint32(const uint8_t *ptr)
32{
33    if (ptr == nullptr) {
34        return 0;
35    }
36    uint32_t bigVar = (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
37    return bigVar;
38}
39bool FuzzDataChannelStub(const uint8_t *rawData, size_t size)
40{
41    uint32_t code = ConvertToUint32(rawData);
42    rawData = rawData + OFFSET;
43    size = size - OFFSET;
44
45    MessageParcel data;
46    data.WriteInterfaceToken(DATACHANNEL_INTERFACE_TOKEN);
47    data.WriteBuffer(rawData, size);
48    data.RewindRead(0);
49    MessageParcel reply;
50    MessageOption option;
51
52    sptr<InputDataChannelStub> channelStub = new InputDataChannelStub();
53    channelStub->OnRemoteRequest(code, data, reply, option);
54
55    return true;
56}
57} // namespace OHOS
58/* Fuzzer entry point */
59extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
60{
61    if (size < OHOS::THRESHOLD) {
62        return 0;
63    }
64    /* Run your code on data */
65    OHOS::FuzzDataChannelStub(data, size);
66    return 0;
67}