1 /*
2  * Copyright (c) 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 #ifndef BYTES_UTILS_H
17 #define BYTES_UTILS_H
18 
19 #include <initializer_list>
20 
21 #include "bytes.h"
22 #include "logger.h"
23 #include "objectstore_errors.h"
24 
25 namespace OHOS::ObjectStore {
26 class BytesUtils final {
27 public:
28     BytesUtils() = delete;
29     ~BytesUtils() = delete;
30 
PutNum(void * val,uint32_t offset,uint32_t valLen,Bytes & data)31     static void PutNum(void *val, uint32_t offset, uint32_t valLen, Bytes &data)
32     {
33         uint32_t len = valLen + offset;
34         if (len > sizeof(data.front()) * data.size()) {
35             data.resize(len);
36         }
37 
38         for (uint32_t i = 0; i < valLen; i++) {
39             // 8 bit = 1 byte
40             data[offset + i] = *(static_cast<uint8_t *>(val) + valLen - i - 1);
41         }
42     }
43 
GetNum(Bytes & data,uint32_t offset,void * val,uint32_t valLen)44     static uint32_t GetNum(Bytes &data, uint32_t offset, void *val, uint32_t valLen)
45     {
46         uint8_t *value = static_cast<uint8_t *>(val);
47         uint32_t len = offset + valLen;
48         uint32_t dataLen = data.size();
49         if (dataLen < len) {
50             LOG_ERROR("GetNum data.size() %{public}d, offset %{public}d, valLen %{public}d", dataLen, offset, valLen);
51             return ERR_DATA_LEN;
52         }
53         for (uint32_t i = 0; i < valLen; i++) {
54             value[i] = data[len - 1 - i];
55         }
56         return SUCCESS;
57     }
58 };
59 } // namespace OHOS::ObjectStore
60 #endif // BYTES_UTILS_H
61