1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.server.net.watchlist; 18 19 import com.android.internal.util.HexDump; 20 21 import java.io.FileDescriptor; 22 import java.io.PrintWriter; 23 import java.util.Collections; 24 import java.util.HashSet; 25 import java.util.List; 26 import java.util.Set; 27 28 /** 29 * Helper class to store all harmful digests in memory. 30 * TODO: Optimize memory usage using byte array with binary search. 31 */ 32 class HarmfulDigests { 33 34 private final Set<String> mDigestSet; 35 36 HarmfulDigests(List<byte[]> digests) { 37 final HashSet<String> tmpDigestSet = new HashSet<>(); 38 final int size = digests.size(); 39 for (int i = 0; i < size; i++) { 40 tmpDigestSet.add(HexDump.toHexString(digests.get(i))); 41 } 42 mDigestSet = Collections.unmodifiableSet(tmpDigestSet); 43 } 44 45 public boolean contains(byte[] digest) { 46 return mDigestSet.contains(HexDump.toHexString(digest)); 47 } 48 49 public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 50 for (String digest : mDigestSet) { 51 pw.println(digest); 52 } 53 pw.println(""); 54 } 55 } 56
