Line data    Source code

       1              : /*
       2              :  *
       3              :  *    Copyright (c) 2026 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              : #pragma once
      19              : 
      20              : #include <lib/support/Span.h>
      21              : 
      22              : namespace chip {
      23              : 
      24              : /// Provides the ability to split a given span into spans of or below a given size
      25              : template <size_t kSize>
      26              : class ChunkSplitter
      27              : {
      28              : public:
      29            4 :     ChunkSplitter(CharSpan s) : span(s) {}
      30              : 
      31              :     /// Returns the next character span
      32              :     ///
      33              :     /// out - contains the next span of size at most kSize or an empty span if no more elements are available
      34              :     ///
      35              :     /// Returns true if an element is available, false otherwise.
      36           14 :     bool Next(CharSpan & out)
      37              :     {
      38           14 :         if (offset >= span.size())
      39              :         {
      40            7 :             out = CharSpan();
      41            7 :             return false; // nothing left
      42              :         }
      43              :         else
      44              :         {
      45            7 :             size_t nextSize = std::min(kSize, span.size() - offset);
      46            7 :             out             = span.SubSpan(offset, nextSize);
      47            7 :             offset += nextSize;
      48            7 :             return true;
      49              :         }
      50              :     }
      51              : 
      52              : protected:
      53              :     const CharSpan span; // the full span to split
      54              :     size_t offset = 0;   // the start of the next chunk to return
      55              : };
      56              : 
      57              : } // namespace chip