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1 /*
2  * Copyright (c) 2021-2023 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 #ifndef OHOS_CAMERA_METADATA_UTILS_H
17 #define OHOS_CAMERA_METADATA_UTILS_H
18 
19 #include <iostream>
20 #include <list>
21 #include <map>
22 #include <vector>
23 
24 #include "camera_metadata_info.h"
25 #include "message_parcel.h"
26 
27 namespace OHOS::Camera {
28 class MetadataUtils {
29 public:
30     static bool EncodeCameraMetadata(const std::shared_ptr<CameraMetadata> &metadata,
31                                      MessageParcel &data);
32     static void DecodeCameraMetadata(MessageParcel &data, std::shared_ptr<CameraMetadata> &metadata);
33 
34     static void ReadCameraMetadata(MessageParcel &data, common_metadata_header_t *meta, uint32_t tagCount);
35     static bool WriteCameraMetadata(const common_metadata_header_t* meta, MessageParcel &data);
36     static std::string EncodeToString(std::shared_ptr<CameraMetadata> metadata);
37     static std::shared_ptr<CameraMetadata> DecodeFromString(std::string setting);
38     static bool ConvertMetadataToVec(const std::shared_ptr<CameraMetadata> &metadata,
39         std::vector<uint8_t>& cameraAbility);
40     static void ConvertVecToMetadata(const std::vector<uint8_t>& cameraAbility,
41         std::shared_ptr<CameraMetadata> &metadata);
42     static void FreeMetadataBuffer(camera_metadata_item_t &entry);
43 
44     template <class T> static void WriteData(T data, std::vector<uint8_t>& cameraAbility);
45     template <class T> static void ReadData(T &data, int32_t &index, const std::vector<uint8_t>& cameraAbility);
46 private:
47     static bool WriteMetadata(const camera_metadata_item_t &item, MessageParcel &data);
48     static bool ReadMetadata(camera_metadata_item_t &item, MessageParcel &data);
49     static void ItemDataToBuffer(const camera_metadata_item_t &item, void **buffer);
50     static void WriteMetadataDataToVec(const camera_metadata_item_t &entry, std::vector<uint8_t>& cameraAbility);
51     static void ReadMetadataDataFromVec(int32_t &index, camera_metadata_item_t &entry,
52         const std::vector<uint8_t>& cameraAbility);
53     static int copyEncodeToStringMem(common_metadata_header_t *meta, char *encodeData, int32_t encodeDataLen);
54     static int copyDecodeFromStringMem(common_metadata_header_t *meta, char *decodeData,
55         char *decodeMetadataData, uint32_t totalLen);
56 };
57 
58 template <class T>
WriteData(T data,std::vector<uint8_t> & cameraAbility)59 void MetadataUtils::WriteData(T data, std::vector<uint8_t>& cameraAbility)
60 {
61     T dataTemp = data;
62     uint8_t *dataPtr = reinterpret_cast<uint8_t *>(&dataTemp);
63     for (size_t j = 0; j < sizeof(T); j++) {
64         cameraAbility.push_back(*(dataPtr + j));
65     }
66 }
67 
68 template <class T>
ReadData(T & data,int32_t & index,const std::vector<uint8_t> & cameraAbility)69 void MetadataUtils::ReadData(T &data, int32_t &index, const std::vector<uint8_t>& cameraAbility)
70 {
71     constexpr uint32_t typeLen = sizeof(T);
72     uint8_t array[typeLen] = {0};
73     T *ptr = nullptr;
74     for (size_t j = 0; j < sizeof(T); j++) {
75         array[j] = cameraAbility.at(index++);
76     }
77     ptr = reinterpret_cast<T *>(array);
78     data = *ptr;
79 }
80 } // namespace Camera
81 #endif // OHOS_CAMERA_METADATA_UTILS_H
82