text: /*
   * Copyright (C) 2021 Huawei Device Co., Ltd.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  #ifndef HAP_RANDOM_ACCESS_FILE_H
  #define HAP_RANDOM_ACCESS_FILE_H
  
  #include "common/export_define.h"
  #include "common/hap_byte_buffer.h"
  #include "util/hap_verify_openssl_utils.h"
  
  namespace OHOS {
  namespace Security {
  namespace Verify {
  struct MmapInfo {
      long long mmapPosition;
      int readMoreLen;
      int mmapSize;
      char* mapAddr;
  };
  
  class RandomAccessFile {
  public:
      DLL_EXPORT RandomAccessFile();
      DLL_EXPORT ~RandomAccessFile();
      DLL_EXPORT bool Init(const std::string& filePath);
      DLL_EXPORT long long GetLength() const;
      DLL_EXPORT long long ReadFileFullyFromOffset(HapByteBuffer& buffer, long long offset);
      DLL_EXPORT long long ReadFileFullyFromOffset(char buf[], long long offset, int bufCapacity);
      bool ReadFileFromOffsetAndDigestUpdate(const DigestParameter& digestParam, int chunkSize, long long offset);
  
  private:
      long long DoMMap(int bufCapacity, long long offset, MmapInfo& mmapInfo);
  
      static const int FILE_OPEN_FAIL_ERROR_NUM;
      static int memoryPageSize;
      int fd;
      long long fileLength;
  };
  } // namespace Verify
  } // namespace Security
  } // namespace OHOS
  #endif // HAP_RANDOM_ACCESS_FILE_H
  