DexBackedArrayEncodedValue.java revision dc9e5455bc40510088daa43ec6a3bca77ffc48bc 
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
32package org.jf.dexlib2.dexbacked.value;
33
34import org.jf.dexlib2.dexbacked.DexFileBuffer;
35import org.jf.dexlib2.dexbacked.DexFileReader;
36import org.jf.dexlib2.ValueType;
37import org.jf.dexlib2.dexbacked.util.VariableSizeList;
38import org.jf.dexlib2.iface.value.ArrayEncodedValue;
39import org.jf.dexlib2.iface.value.EncodedValue;
40
41import javax.annotation.Nonnull;
42import java.util.List;
43
44public class DexBackedArrayEncodedValue implements ArrayEncodedValue {
45    @Nonnull public final DexFileBuffer dexFile;
46    private final int encodedArrayOffset;
47
48    public DexBackedArrayEncodedValue(@Nonnull DexFileReader dexFileReader) {
49        this.dexFile = dexFileReader.getDexFile();
50        this.encodedArrayOffset = dexFileReader.getOffset();
51        skipFrom(dexFileReader);
52    }
53
54    public static void skipFrom(@Nonnull DexFileReader reader) {
55        int elementCount = reader.readSmallUleb128();
56        for (int i=0; i<elementCount; i++) {
57            DexBackedEncodedValue.skipFrom(reader);
58        }
59    }
60
61    @Override public int getValueType() { return ValueType.ARRAY; }
62
63    @Nonnull
64    @Override
65    public List<? extends EncodedValue> getValue() {
66        DexFileReader reader = dexFile.readerAt(encodedArrayOffset);
67        final int size = reader.readSmallUleb128();
68
69        return new VariableSizeList<EncodedValue>(dexFile, reader.getOffset()) {
70            @Nonnull
71            @Override
72            protected EncodedValue readItem(@Nonnull DexFileReader dexFileReader, int index) {
73                return DexBackedEncodedValue.readFrom(dexFileReader);
74            }
75
76            @Override public int size() { return size;}
77        };
78    }
79}
80