/*
 * 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.
 */

#include "distributedbmshost_fuzzer.h"

#include <cstddef>
#include <cstdint>

#include "distributed_bms_host.h"
#include "securec.h"

using namespace OHOS::AppExecFwk;
namespace OHOS {
constexpr size_t FOO_MAX_LEN = 1024;
constexpr size_t U32_AT_SIZE = 4;
constexpr size_t MESSAGE_SIZE = 10;

uint32_t GetU32Data(const char* ptr)
{
    return (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
}
bool DoSomethingInterestingWithMyAPI(const char* data, size_t size)
{
    uint32_t code = (GetU32Data(data) % MESSAGE_SIZE);
    MessageParcel datas;
    std::u16string descriptor = DistributedBmsHost::GetDescriptor();
    datas.WriteInterfaceToken(descriptor);
    datas.WriteBuffer(data, size);
    datas.RewindRead(0);
    MessageParcel reply;
    MessageOption option;
    DistributedBmsHost distributedBmsHost;
    distributedBmsHost.OnRemoteRequest(code, datas, reply, option);
    return true;
}
}

// Fuzzer entry point.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
    /* Run your code on data */
    if (data == nullptr) {
        return 0;
    }

    if (size < OHOS::U32_AT_SIZE) {
        return 0;
    }

    /* Validate the length of size */
    if (size > OHOS::FOO_MAX_LEN) {
        return 0;
    }

    char* ch = static_cast<char*>(malloc(size + 1));
    if (ch == nullptr) {
        return 0;
    }

    (void)memset_s(ch, size + 1, 0x00, size + 1);
    if (memcpy_s(ch, size, data, size) != EOK) {
        free(ch);
        ch = nullptr;
        return 0;
    }
    OHOS::DoSomethingInterestingWithMyAPI(ch, size);
    free(ch);
    ch = nullptr;
    return 0;
}