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 com.android.server.net.watchlist;
  
  import com.android.internal.util.HexDump;
  
  import java.io.FileDescriptor;
  import java.io.PrintWriter;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  /**
   * Helper class to store all harmful digests in memory.
   * TODO: Optimize memory usage using byte array with binary search.
   */
  class HarmfulDigests {
  
      private final Set<String> mDigestSet;
  
      HarmfulDigests(List<byte[]> digests) {
          final HashSet<String> tmpDigestSet = new HashSet<>();
          final int size = digests.size();
          for (int i = 0; i < size; i++) {
              tmpDigestSet.add(HexDump.toHexString(digests.get(i)));
          }
          mDigestSet = Collections.unmodifiableSet(tmpDigestSet);
      }
  
      public boolean contains(byte[] digest) {
          return mDigestSet.contains(HexDump.toHexString(digest));
      }
  
      public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
          for (String digest : mDigestSet) {
              pw.println(digest);
          }
          pw.println("");
      }
  }
  