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 <cstddef>
17#include <cstdint>
18#include "hdf_log.h"
19#include "usb_fuzzer.h"
20#include "v1_0/usb_interface_stub.h"
21
22using namespace OHOS::HDI::Usb::V1_0;
23
24namespace OHOS {
25constexpr size_t THRESHOLD = 10;
26constexpr int32_t OFFSET = 4;
27constexpr int32_t ZERO_BIT = 0;
28constexpr int32_t FIRST_BIT = 1;
29constexpr int32_t SECOND_BIT = 2;
30constexpr int32_t THIRD_BIT = 3;
31constexpr int32_t ZERO_MOVE_LEN = 24;
32constexpr int32_t FIRST_MOVE_LEN = 16;
33constexpr int32_t SECOND_MOVE_LEN = 8;
34const std::u16string USB_INTERFACE_TOKEN = u"ohos.hdi.usb.v1_0.IUsbInterface";
35
36uint32_t Convert2Uint32(const uint8_t *ptr)
37{
38    if (ptr == nullptr) {
39        HDF_LOGE("%{public}s: ptr is null", __func__);
40        return 0;
41    }
42    /*
43     * Move the 0th digit 24 to the left, the first digit 16 to the left, the second digit 8 to the left,
44     * and the third digit no left
45     */
46    return (ptr[ZERO_BIT] << ZERO_MOVE_LEN) | (ptr[FIRST_BIT] << FIRST_MOVE_LEN) | (ptr[SECOND_BIT] <<
47        SECOND_MOVE_LEN) | (ptr[THIRD_BIT]);
48}
49
50bool DoSomethingInterestingWithMyAPI(const uint8_t *rawData, size_t size)
51{
52    if (rawData == nullptr) {
53        HDF_LOGE("%{public}s: rawData is null", __func__);
54        return false;
55    }
56    uint32_t code = Convert2Uint32(rawData);
57    rawData = rawData + OFFSET;
58    size = size - OFFSET;
59
60    MessageParcel data;
61    data.WriteInterfaceToken(USB_INTERFACE_TOKEN);
62    data.WriteBuffer(rawData, size);
63    data.RewindRead(0);
64    MessageParcel reply;
65    MessageOption option;
66    sptr<IUsbInterface> usbInterface = IUsbInterface::Get(false);
67    if (usbInterface == nullptr) {
68        HDF_LOGE("%{public}s: get usbInterface failed", __func__);
69        return false;
70    }
71    sptr<UsbInterfaceStub> interfaceStub = new UsbInterfaceStub(usbInterface);
72    if (interfaceStub == nullptr) {
73        HDF_LOGE("%{public}s: new interfaceStub failed", __func__);
74        return false;
75    }
76    interfaceStub->OnRemoteRequest(code, data, reply, option);
77
78    return true;
79}
80} // namespace OHOS
81
82/* Fuzzer entry point */
83extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
84{
85    if (size < OHOS::THRESHOLD) {
86        return 0;
87    }
88
89    /* Run your code on data */
90    OHOS::DoSomethingInterestingWithMyAPI(data, size);
91    return 0;
92}
93