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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.dexbacked.raw;
33 
34 import org.jf.dexlib2.dexbacked.DexBackedDexFile;
35 import org.jf.dexlib2.dexbacked.raw.util.DexAnnotator;
36 import org.jf.dexlib2.util.AnnotatedBytes;
37 
38 import javax.annotation.Nonnull;
39 import javax.annotation.Nullable;
40 
41 public class FieldIdItem {
42     public static final int ITEM_SIZE = 8;
43 
44     public static final int CLASS_OFFSET = 0;
45     public static final int TYPE_OFFSET = 2;
46     public static final int NAME_OFFSET = 4;
47 
48     @Nonnull
makeAnnotator(@onnull DexAnnotator annotator, @Nonnull MapItem mapItem)49     public static SectionAnnotator makeAnnotator(@Nonnull DexAnnotator annotator, @Nonnull MapItem mapItem) {
50         return new SectionAnnotator(annotator, mapItem) {
51             @Nonnull @Override public String getItemName() {
52                 return "field_id_item";
53             }
54 
55             @Override
56             protected void annotateItem(@Nonnull AnnotatedBytes out, int itemIndex, @Nullable String itemIdentity) {
57                 int classIndex = dexFile.readUshort(out.getCursor());
58                 out.annotate(2, "class_idx = %s", TypeIdItem.getReferenceAnnotation(dexFile, classIndex));
59 
60                 int typeIndex = dexFile.readUshort(out.getCursor());
61                 out.annotate(2, "return_type_idx = %s", TypeIdItem.getReferenceAnnotation(dexFile, typeIndex));
62 
63                 int nameIndex = dexFile.readSmallUint(out.getCursor());
64                 out.annotate(4, "name_idx = %s", StringIdItem.getReferenceAnnotation(dexFile, nameIndex));
65             }
66         };
67     }
68 
69     @Nonnull
70     public static String asString(@Nonnull DexBackedDexFile dexFile, int fieldIndex) {
71         int fieldOffset = dexFile.getFieldIdItemOffset(fieldIndex);
72         int classIndex = dexFile.readUshort(fieldOffset + CLASS_OFFSET);
73         String classType = dexFile.getType(classIndex);
74 
75         int typeIndex = dexFile.readUshort(fieldOffset + TYPE_OFFSET);
76         String fieldType = dexFile.getType(typeIndex);
77 
78         int nameIndex = dexFile.readSmallUint(fieldOffset + NAME_OFFSET);
79         String fieldName = dexFile.getString(nameIndex);
80 
81         return String.format("%s->%s:%s", classType, fieldName, fieldType);
82     }
83 
84     @Nonnull
85     public static String getReferenceAnnotation(@Nonnull DexBackedDexFile dexFile, int fieldIndex) {
86         try {
87             String fieldString = asString(dexFile, fieldIndex);
88             return String.format("field_id_item[%d]: %s", fieldIndex, fieldString);
89         } catch (Exception ex) {
90             ex.printStackTrace(System.err);
91         }
92         return String.format("field_id_item[%d]", fieldIndex);
93     }
94 
95     public static String[] getFields(@Nonnull RawDexFile dexFile) {
96         MapItem mapItem = dexFile.getMapItemForSection(ItemType.FIELD_ID_ITEM);
97         if (mapItem == null) {
98             return new String[0];
99         }
100 
101         int fieldCount = mapItem.getItemCount();
102         String[] ret = new String[fieldCount];
103         for (int i=0; i<fieldCount; i++) {
104             ret[i] = asString(dexFile, i);
105         }
106         return ret;
107     }
108 }
109