1 /* 2 * Copyright (c) 2025 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 DISTRIBUTEDDATAMGR_PASTEBOARD_TLV_BUFFER_H 17 #define DISTRIBUTEDDATAMGR_PASTEBOARD_TLV_BUFFER_H 18 19 #include <vector> 20 21 #include "unified_meta.h" 22 23 namespace OHOS::MiscServices { 24 #pragma pack(1) 25 struct TLVHead { 26 uint16_t tag; 27 uint32_t len; 28 std::uint8_t value[0]; 29 }; 30 #pragma pack() 31 32 /* 33 * Common tag definitions. 34 * Product should use after TAG_BUFF 35 **/ 36 enum COMMON_TAG : uint16_t { 37 TAG_VECTOR_ITEM = 0x0000, 38 TAG_MAP_KEY, 39 TAG_MAP_VALUE, // std::vector<uint8_t> 40 TAG_MAP_VALUE_TYPE, 41 TAG_VARIANT_INDEX, 42 TAG_VARIANT_VALUE, 43 TAG_BUFF = 0x0100, 44 }; 45 46 using ValueType = std::variant<int32_t, int64_t, bool, double, std::string, std::vector<uint8_t>>; 47 using Details = std::map<std::string, ValueType>; 48 49 using EntryValue = UDMF::ValueType; 50 using Object = UDMF::Object; 51 52 struct TLVBuffer { 53 public: TLVBufferTLVBuffer54 TLVBuffer() : total_(0), cursor_(0) {} TLVBufferTLVBuffer55 explicit TLVBuffer(size_t total) : total_(total), cursor_(0) {} 56 virtual ~TLVBuffer() = default; 57 SkipTLVBuffer58 inline bool Skip(size_t len) 59 { 60 if (len > total_ - cursor_) { 61 return false; 62 } 63 cursor_ += len; 64 return true; 65 } 66 IsEnoughTLVBuffer67 inline bool IsEnough() const 68 { 69 return cursor_ < total_; 70 } 71 HasExpectBufferTLVBuffer72 inline bool HasExpectBuffer(uint32_t expectLen) const 73 { 74 return total_ >= cursor_ && total_ - cursor_ >= expectLen; 75 } 76 77 protected: 78 size_t total_ = 0; 79 size_t cursor_ = 0; 80 }; 81 } // namespace OHOS::MiscServices 82 #endif // DISTRIBUTEDDATAMGR_PASTEBOARD_TLV_BUFFER_H 83