content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * 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.
   */
  
  package android.util.apk;
  
  import java.io.IOException;
  import java.security.DigestException;
  
  /** Source of data to be digested. */
  interface DataSource {
  
      /**
       * Returns the size (in bytes) of the data offered by this source.
       */
      long size();
  
      /**
       * Feeds the specified region of this source's data into the provided digester.
       *
       * @param offset offset of the region inside this data source.
       * @param size size (in bytes) of the region.
       */
      void feedIntoDataDigester(DataDigester md, long offset, int size)
              throws IOException, DigestException;
  }
  