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         1096 : static CHIP_ERROR InitWriterWithSpaceReserved(System::PacketBufferTLVWriter & aWriter, uint32_t aReserveSpace)
      29              : {
      30         1096 :     System::PacketBufferHandle msgBuf = System::PacketBufferHandle::New(kMaxSecureSduLengthBytes);
      31         1096 :     VerifyOrReturnError(!msgBuf.IsNull(), CHIP_ERROR_NO_MEMORY);
      32         1096 :     uint16_t reservedSize = 0;
      33              : 
      34         1096 :     if (msgBuf->AvailableDataLength() > kMaxSecureSduLengthBytes)
      35              :     {
      36            0 :         reservedSize = static_cast<uint16_t>(msgBuf->AvailableDataLength() - kMaxSecureSduLengthBytes);
      37              :     }
      38              : 
      39         1096 :     reservedSize = static_cast<uint16_t>(reservedSize + Crypto::CHIP_CRYPTO_AEAD_MIC_LENGTH_BYTES + aReserveSpace);
      40         1096 :     aWriter.Init(std::move(msgBuf));
      41         1096 :     ReturnErrorOnFailure(aWriter.ReserveBuffer(reservedSize));
      42         1096 :     return CHIP_NO_ERROR;
      43         1096 : };
      44              : } // namespace app
      45              : } // namespace chip