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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
     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