Checks if files with given hashes are present in the file store.

  Args:
    hash_ids: A list of SHA256HashID objects.

  Returns:
    A dict where SHA256HashID objects are keys. Corresponding values
    may be False (if hash id is not present) or True if it is not present.

def CheckHashes(hash_ids):
  """Checks if files with given hashes are present in the file store.

  Args:
    hash_ids: A list of SHA256HashID objects.

  Returns:
    A dict where SHA256HashID objects are keys. Corresponding values
    may be False (if hash id is not present) or True if it is not present.
  """
  return {
      k: bool(v)
      for k, v in data_store.REL_DB.ReadHashBlobReferences(hash_ids).items()
  }