text: /*
   * Copyright (c) Facebook, Inc. and its affiliates.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   */
  
  #pragma once
  
  #include <glog/logging.h>
  
  // TODO: Enable CHECK_CONSISTENCY only in debug mode or test environments (or
  // just in demand)
  #define CHECK_CONSISTENCY 1
  
  constexpr static int NULL_VALUE = 0;
  
  // Value used to verify if the data is serialized with LittleEndian order
  constexpr static int ALIGNMENT = 0xFE;
  
  using Key = uint16_t;
  
  using Byte = uint8_t;
  
  namespace facebook {
  namespace react {
  
  struct Header {
    uint16_t alignment; // alignment of serialization
    uint16_t count; // amount of items
    uint16_t bufferSize; // Size of buffer that contains Strings and Objects
  };
  
  constexpr static int KEY_SIZE = sizeof(Key);
  constexpr static int HEADER_SIZE = sizeof(Header);
  constexpr static int INT_SIZE = sizeof(int);
  constexpr static int DOUBLE_SIZE = sizeof(double);
  constexpr static int UINT8_SIZE = sizeof(uint8_t);
  constexpr static int UINT16_SIZE = sizeof(uint16_t);
  constexpr static int UINT64_SIZE = sizeof(uint64_t);
  
  // 10 bytes : 2 key + 8 value
  constexpr static int BUCKET_SIZE = KEY_SIZE + UINT64_SIZE;
  
  /**
   * Returns the offset of the key received by parameter.
   */
  inline int getKeyOffset(Key key) {
    return HEADER_SIZE + BUCKET_SIZE * key;
  }
  
  /**
   * Returns the offset of the value associated to the key received by parameter.
   */
  inline int getValueOffset(Key key) {
    return getKeyOffset(key) + KEY_SIZE;
  }
  
  inline void
  checkKeyConsistency(const Header &header, const uint8_t *data, Key key) {
  #ifdef CHECK_CONSISTENCY
    if (key >= header.count) {
      LOG(ERROR) << "Error: Key is higher than size of Map - key '" << key
                 << "' - size: '" << header.count << "'";
      exit(1);
    }
  
    Key storedKey = 0;
    memcpy(
        reinterpret_cast<Key *>(&storedKey),
        reinterpret_cast<const Key *>(data + getKeyOffset(key)),
        KEY_SIZE);
  
    if (storedKey != key) {
      LOG(ERROR) << "Error while reading key, expecting '" << key << "' found: '"
                 << storedKey << "'";
      exit(1);
    }
  #endif
  }
  
  } // namespace react
  } // namespace facebook
  