1/*
2 * Copyright (C) 2014 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
17package dexfuzz.rawdex.formats;
18
19import dexfuzz.rawdex.DexRandomAccessFile;
20import dexfuzz.rawdex.Instruction;
21import dexfuzz.rawdex.OpcodeInfo;
22
23import java.io.IOException;
24
25public class Format22cs extends Format2 implements ContainsVRegs, ContainsPoolIndex {
26  @Override
27  public void writeToFile(DexRandomAccessFile file, Instruction insn) throws IOException {
28    throw new Error("Did not expect to have to write a 22cs instruction!");
29    // If for some reason 22cs instructions were in DEX files in the future, uncomment:
30    //file.writeByte((byte) insn.info.value);
31    //file.writeByte((byte) (insn.vreg_a | (insn.vreg_b << 4)));
32    //file.writeUShort((short) insn.vreg_c);
33    //return;
34  }
35
36  @Override
37  public long getA(byte[] raw) throws IOException {
38    return RawInsnHelper.getUnsignedLowNibbleFromByte(raw, 1);
39  }
40
41  @Override
42  public long getB(byte[] raw) throws IOException {
43    return RawInsnHelper.getUnsignedHighNibbleFromByte(raw, 1);
44  }
45
46  @Override
47  public long getC(byte[] raw) throws IOException {
48    return RawInsnHelper.getUnsignedShortFromTwoBytes(raw, 2);
49  }
50
51  @Override
52  public int getVRegCount() {
53    return 2;
54  }
55
56  @Override
57  public int getPoolIndex(Instruction insn) {
58    return (int) insn.vregC;
59  }
60
61  @Override
62  public void setPoolIndex(Instruction insn, int poolIndex) {
63    insn.vregC = poolIndex;
64  }
65
66  @Override
67  public PoolIndexKind getPoolIndexKind(OpcodeInfo info) {
68    // This should technically be a byte offset, but we should never encounter
69    // this format during DEX mutation anyway. (see writeToFile())
70    return PoolIndexKind.Field;
71  }
72}
73