Line data    Source code

       1             : /*
       2             :  *
       3             :  *    Copyright (c) 2021 Project CHIP Authors
       4             :  *    All rights reserved.
       5             :  *
       6             :  *    Licensed under the Apache License, Version 2.0 (the "License");
       7             :  *    you may not use this file except in compliance with the License.
       8             :  *    You may obtain a copy of the License at
       9             :  *
      10             :  *        http://www.apache.org/licenses/LICENSE-2.0
      11             :  *
      12             :  *    Unless required by applicable law or agreed to in writing, software
      13             :  *    distributed under the License is distributed on an "AS IS" BASIS,
      14             :  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      15             :  *    See the License for the specific language governing permissions and
      16             :  *    limitations under the License.
      17             :  */
      18             : 
      19             : #pragma once
      20             : 
      21             : #include <app/StatusResponse.h>
      22             : #include <system/SystemPacketBuffer.h>
      23             : #include <system/TLVPacketBufferBackingStore.h>
      24             : 
      25             : namespace chip {
      26             : namespace app {
      27             : 
      28         962 : static CHIP_ERROR InitWriterWithSpaceReserved(System::PacketBufferTLVWriter & aWriter, uint32_t aReserveSpace)
      29             : {
      30         962 :     System::PacketBufferHandle msgBuf = System::PacketBufferHandle::New(kMaxSecureSduLengthBytes);
      31         962 :     VerifyOrReturnError(!msgBuf.IsNull(), CHIP_ERROR_NO_MEMORY);
      32         962 :     uint16_t reservedSize = 0;
      33             : 
      34         962 :     if (msgBuf->AvailableDataLength() > kMaxSecureSduLengthBytes)
      35             :     {
      36           0 :         reservedSize = static_cast<uint16_t>(msgBuf->AvailableDataLength() - kMaxSecureSduLengthBytes);
      37             :     }
      38             : 
      39         962 :     reservedSize = static_cast<uint16_t>(reservedSize + Crypto::CHIP_CRYPTO_AEAD_MIC_LENGTH_BYTES + aReserveSpace);
      40         962 :     aWriter.Init(std::move(msgBuf));
      41         962 :     ReturnErrorOnFailure(aWriter.ReserveBuffer(reservedSize));
      42         962 :     return CHIP_NO_ERROR;
      43         962 : };
      44             : } // namespace app
      45             : } // namespace chip