tools/dexfuzz/src/dexfuzz/rawdex/TypeList.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package dexfuzz.rawdex;

import java.io.IOException;

public class TypeList implements RawDexObject {
  public int size;
  public TypeItem[] list;

  @Override
  public void read(DexRandomAccessFile file) throws IOException {
    file.alignForwards(4);
    file.getOffsetTracker().getNewOffsettable(file, this);
    size = file.readUInt();
    list = new TypeItem[size];
    for (int i = 0; i < size; i++) {
      (list[i] = new TypeItem()).read(file);
    }
  }

  @Override
  public void write(DexRandomAccessFile file) throws IOException {
    file.alignForwards(4);
    file.getOffsetTracker().updatePositionOfNextOffsettable(file);
    file.writeUInt(size);
    for (TypeItem typeItem : list) {
      typeItem.write(file);
    }
  }

  @Override
  public void incrementIndex(IndexUpdateKind kind, int insertedIdx) {
    for (TypeItem type : list) {
      type.incrementIndex(kind, insertedIdx);
    }
  }

  /**
   * Returns if this TypeList comes before the provided TypeList, considering the legal
   * ordering of TypeLists in DEX files.
   */
  public boolean comesBefore(TypeList other) {
    int checkSize = Math.min(size, other.size);
    for (int i = 0; i < checkSize; i++) {
      if (list[i].typeIdx < other.list[i].typeIdx) {
        return true;
      } else if (list[i].typeIdx > other.list[i].typeIdx) {
        return false;
      }
    }
    if (size == other.size) {
      return false;
    }
    return true;
  }
}