1/* 2 * Copyright 2013, Google Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: 8 * 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * * Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following disclaimer 13 * in the documentation and/or other materials provided with the 14 * distribution. 15 * * Neither the name of Google Inc. nor the names of its 16 * contributors may be used to endorse or promote products derived from 17 * this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32package org.jf.dexlib2.dexbacked.raw; 33 34import org.jf.dexlib2.dexbacked.BaseDexBuffer; 35 36public class OdexHeaderItem { 37 public static final int ITEM_SIZE = 40; 38 39 public static final byte[][] MAGIC_VALUES= new byte[][] { 40 new byte[] {0x64, 0x65, 0x79, 0x0A, 0x30, 0x33, 0x35, 0x00}, // "dey\n035\0" 41 new byte[] {0x64, 0x65, 0x79, 0x0A, 0x30, 0x33, 0x36, 0x00} // "dey\n036\0" 42 }; 43 44 public static final int MAGIC_OFFSET = 0; 45 public static final int MAGIC_LENGTH = 8; 46 public static final int DEX_OFFSET = 8; 47 public static final int DEX_LENGTH_OFFSET = 12; 48 public static final int DEPENDENCIES_OFFSET = 16; 49 public static final int DEPENDENCIES_LENGTH_OFFSET = 20; 50 public static final int AUX_OFFSET = 24; 51 public static final int AUX_LENGTH_OFFSET = 28; 52 public static final int FLAGS_OFFSET = 32; 53 54 public static int getVersion(byte[] magic) { 55 if (magic.length < 8) { 56 return 0; 57 } 58 59 boolean matches = true; 60 for (int i=0; i<MAGIC_VALUES.length; i++) { 61 byte[] expected = MAGIC_VALUES[i]; 62 matches = true; 63 for (int j=0; j<8; j++) { 64 if (magic[j] != expected[j]) { 65 matches = false; 66 break; 67 } 68 } 69 if (matches) { 70 return i==0?35:36; 71 } 72 } 73 return 0; 74 } 75 76 public static boolean verifyMagic(byte[] buf) { 77 // verifies the magic value 78 return getVersion(buf) != 0; 79 } 80 81 public static int getDexOffset(byte[] buf) { 82 BaseDexBuffer bdb = new BaseDexBuffer(buf); 83 return bdb.readSmallUint(DEX_OFFSET); 84 } 85 86 public static int getDependenciesOffset(byte[] buf) { 87 BaseDexBuffer bdb = new BaseDexBuffer(buf); 88 return bdb.readSmallUint(DEPENDENCIES_OFFSET); 89 } 90} 91