/*
* Copyright 2013, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jf.dexlib2.dexbacked.raw;
import org.jf.dexlib2.dexbacked.BaseDexBuffer;
public class OdexHeaderItem {
public static final int ITEM_SIZE = 40;
public static final byte[][] MAGIC_VALUES= new byte[][] {
new byte[] {0x64, 0x65, 0x79, 0x0A, 0x30, 0x33, 0x35, 0x00}, // "dey\n035\0"
new byte[] {0x64, 0x65, 0x79, 0x0A, 0x30, 0x33, 0x36, 0x00} // "dey\n036\0"
};
public static final int MAGIC_OFFSET = 0;
public static final int MAGIC_LENGTH = 8;
public static final int DEX_OFFSET = 8;
public static final int DEX_LENGTH_OFFSET = 12;
public static final int DEPENDENCIES_OFFSET = 16;
public static final int DEPENDENCIES_LENGTH_OFFSET = 20;
public static final int AUX_OFFSET = 24;
public static final int AUX_LENGTH_OFFSET = 28;
public static final int FLAGS_OFFSET = 32;
public static int getVersion(byte[] magic) {
if (magic.length < 8) {
return 0;
}
boolean matches = true;
for (int i=0; i<MAGIC_VALUES.length; i++) {
byte[] expected = MAGIC_VALUES[i];
matches = true;
for (int j=0; j<8; j++) {
if (magic[j] != expected[j]) {
matches = false;
break;
}
}
if (matches) {
return i==0?35:36;
}
}
return 0;
}
public static boolean verifyMagic(byte[] buf) {
// verifies the magic value
return getVersion(buf) != 0;
}
public static int getDexOffset(byte[] buf) {
BaseDexBuffer bdb = new BaseDexBuffer(buf);
return bdb.readSmallUint(DEX_OFFSET);
}
public static int getDependenciesOffset(byte[] buf) {
BaseDexBuffer bdb = new BaseDexBuffer(buf);
return bdb.readSmallUint(DEPENDENCIES_OFFSET);
}
}