github.com/google/syzkaller@v0.0.0-20240517125934-c0f1611a36d6/executor/_include/flatbuffers/buffer_ref.h (about)

     1  /*
     2   * Copyright 2021 Google Inc. All rights reserved.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  #ifndef FLATBUFFERS_BUFFER_REF_H_
    18  #define FLATBUFFERS_BUFFER_REF_H_
    19  
    20  #include "flatbuffers/base.h"
    21  #include "flatbuffers/verifier.h"
    22  
    23  namespace flatbuffers {
    24  
    25  // Convenient way to bundle a buffer and its length, to pass it around
    26  // typed by its root.
    27  // A BufferRef does not own its buffer.
    28  struct BufferRefBase {};  // for std::is_base_of
    29  
    30  template<typename T> struct BufferRef : BufferRefBase {
    31    BufferRef() : buf(nullptr), len(0), must_free(false) {}
    32    BufferRef(uint8_t *_buf, uoffset_t _len)
    33        : buf(_buf), len(_len), must_free(false) {}
    34  
    35    ~BufferRef() {
    36      if (must_free) free(buf);
    37    }
    38  
    39    const T *GetRoot() const { return flatbuffers::GetRoot<T>(buf); }
    40  
    41    bool Verify() {
    42      Verifier verifier(buf, len);
    43      return verifier.VerifyBuffer<T>(nullptr);
    44    }
    45  
    46    uint8_t *buf;
    47    uoffset_t len;
    48    bool must_free;
    49  };
    50  
    51  }  // namespace flatbuffers
    52  
    53  #endif  // FLATBUFFERS_BUFFER_REF_H_