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      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 
     32 package org.jf.dexlib2;
     33 
     34 import com.google.common.collect.Maps;
     35 
     36 import javax.annotation.Nullable;
     37 import java.util.HashMap;
     38 
     39 public class Opcodes {
     40     private final Opcode[] opcodesByValue;
     41     private final HashMap<String, Opcode> opcodesByName;
     42 
     43     public Opcodes(int api) {
     44         opcodesByValue = new Opcode[256];
     45         opcodesByName = Maps.newHashMap();
     46 
     47         for (Opcode opcode: Opcode.values()) {
     48             if (!opcode.format.isPayloadFormat) {
     49                 if (api <= opcode.getMaxApi() && api >= opcode.getMinApi()) {
     50                     opcodesByValue[opcode.value] = opcode;
     51                     opcodesByName.put(opcode.name.toLowerCase(), opcode);
     52                 }
     53             }
     54         }
     55     }
     56 
     57     @Nullable
     58     public Opcode getOpcodeByName(String opcodeName) {
     59         return opcodesByName.get(opcodeName.toLowerCase());
     60     }
     61 
     62     @Nullable
     63     public Opcode getOpcodeByValue(int opcodeValue) {
     64         switch (opcodeValue) {
     65             case 0x100:
     66                 return Opcode.PACKED_SWITCH_PAYLOAD;
     67             case 0x200:
     68                 return Opcode.SPARSE_SWITCH_PAYLOAD;
     69             case 0x300:
     70                 return Opcode.ARRAY_PAYLOAD;
     71             default:
     72                 if (opcodeValue >= 0 && opcodeValue < opcodesByValue.length) {
     73                     return opcodesByValue[opcodeValue];
     74                 }
     75                 return null;
     76         }
     77     }
     78 }
     79