| /* |
| * |
| * Copyright (c) 2020 Project CHIP Authors |
| * |
| * 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. |
| */ |
| |
| #pragma once |
| |
| #include <string.h> |
| |
| #include <lib/dnssd/minimal_mdns/records/ResourceRecord.h> |
| |
| namespace mdns { |
| namespace Minimal { |
| |
| class TxtResourceRecord : public ResourceRecord |
| { |
| public: |
| static constexpr uint64_t kDefaultTtl = 4500; // 75 minutes |
| |
| TxtResourceRecord(const FullQName & qName, const char ** entries, size_t entryCount) : |
| ResourceRecord(QType::TXT, qName), mEntries(entries), mEntryCount(entryCount) |
| { |
| SetTtl(kDefaultTtl); |
| } |
| |
| template <size_t N> |
| TxtResourceRecord(const FullQName & qName, const char * (&entries)[N]) : |
| ResourceRecord(QType::TXT, qName), mEntries(entries), mEntryCount(N) |
| { |
| SetTtl(kDefaultTtl); |
| } |
| |
| // A FullQName is a holder of a string array. |
| TxtResourceRecord(const FullQName & qName, FullQName entries) : |
| ResourceRecord(QType::TXT, qName), mEntries(entries.names), mEntryCount(entries.nameCount) |
| { |
| SetTtl(kDefaultTtl); |
| } |
| size_t GetNumEntries() const { return mEntryCount; } |
| const char * const * GetEntries() const { return mEntries; } |
| |
| protected: |
| bool WriteData(RecordWriter & out) const override |
| { |
| for (size_t i = 0; i < mEntryCount; i++) |
| { |
| size_t len = strlen(mEntries[i]); |
| if (len > kMaxTxtRecordLength) |
| { |
| return false; |
| } |
| |
| out.Put8(static_cast<uint8_t>(len)).PutString(mEntries[i]); |
| } |
| return out.Fit(); |
| } |
| |
| private: |
| const char * const * mEntries; |
| const size_t mEntryCount; |
| |
| static constexpr size_t kMaxTxtRecordLength = 63; |
| }; |
| |
| } // namespace Minimal |
| } // namespace mdns |