Line data    Source code

       1              : /*
       2              :  *    Copyright (c) 2025 Project CHIP Authors
       3              :  *    All rights reserved.
       4              :  *
       5              :  *    Licensed under the Apache License, Version 2.0 (the "License");
       6              :  *    you may not use this file except in compliance with the License.
       7              :  *    You may obtain a copy of the License at
       8              :  *
       9              :  *        http://www.apache.org/licenses/LICENSE-2.0
      10              :  *
      11              :  *    Unless required by applicable law or agreed to in writing, software
      12              :  *    distributed under the License is distributed on an "AS IS" BASIS,
      13              :  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      14              :  *    See the License for the specific language governing permissions and
      15              :  *    limitations under the License.
      16              :  */
      17              : #include <app/data-model/StructDecodeIterator.h>
      18              : 
      19              : namespace chip {
      20              : namespace app {
      21              : namespace Clusters {
      22              : namespace detail {
      23              : 
      24        11327 : CHIP_ERROR StructDecodeIterator::Next(uint8_t & context_tag)
      25              : {
      26        11327 :     if (!mEntered)
      27              :     {
      28         3391 :         VerifyOrReturnError(TLV::kTLVType_Structure == mReader.GetType(), CHIP_ERROR_WRONG_TLV_TYPE);
      29         3390 :         ReturnErrorOnFailure(mReader.EnterContainer(mOuter));
      30         3390 :         mEntered = true;
      31              :     }
      32              : 
      33              :     while (true)
      34              :     {
      35        11326 :         CHIP_ERROR err = mReader.Next();
      36        11326 :         if (err != CHIP_NO_ERROR)
      37              :         {
      38        11326 :             VerifyOrReturnError(err == CHIP_ERROR_END_OF_TLV, err);
      39         3388 :             break;
      40              :         }
      41              : 
      42         7938 :         const TLV::Tag tag = mReader.GetTag();
      43         7938 :         if (!TLV::IsContextTag(tag))
      44              :         {
      45            0 :             continue;
      46              :         }
      47              : 
      48              :         // we know context tags are 8-bit
      49         7938 :         context_tag = static_cast<uint8_t>(TLV::TagNumFromTag(tag));
      50         7938 :         return CHIP_NO_ERROR;
      51            0 :     }
      52              : 
      53              :     // we get here IFF error is CHIP_ERROR_END_OF_TLV. We exit the container but
      54              :     // forward the the `end of tlv` as a final marker
      55         3388 :     ReturnErrorOnFailure(mReader.ExitContainer(mOuter));
      56         3388 :     return CHIP_ERROR_END_OF_TLV;
      57              : }
      58              : 
      59              : } // namespace detail
      60              : } // namespace Clusters
      61              : } // namespace app
      62              : } // namespace chip