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      1 /*
      2  * Copyright 2012, 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 
     32 package org.jf.dexlib2.dexbacked.instruction;
     33 
     34 import org.jf.dexlib2.Opcode;
     35 import org.jf.dexlib2.dexbacked.DexBackedDexFile;
     36 import org.jf.dexlib2.iface.instruction.formats.Instruction22s;
     37 import org.jf.util.NibbleUtils;
     38 
     39 import javax.annotation.Nonnull;
     40 
     41 public class DexBackedInstruction22s extends DexBackedInstruction implements Instruction22s {
     42     public DexBackedInstruction22s(@Nonnull DexBackedDexFile dexFile,
     43                                    @Nonnull Opcode opcode,
     44                                    int instructionStart) {
     45         super(dexFile, opcode, instructionStart);
     46     }
     47 
     48     @Override
     49     public int getRegisterA() {
     50         return NibbleUtils.extractLowUnsignedNibble(dexFile.readByte(instructionStart + 1));
     51     }
     52 
     53     @Override
     54     public int getRegisterB() {
     55         return NibbleUtils.extractHighUnsignedNibble(dexFile.readByte(instructionStart + 1));
     56     }
     57 
     58     @Override public int getNarrowLiteral() { return dexFile.readShort(instructionStart + 2); }
     59     @Override public long getWideLiteral() { return getNarrowLiteral(); }
     60 }
     61