content: /*
   * Copyright (C) 2016 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 com.android.apksig.internal.zip;
  
  import java.nio.ByteBuffer;
  import java.nio.ByteOrder;
  
  /**
   * ZIP End of Central Directory record.
   */
  public class EocdRecord {
      private static final int CD_RECORD_COUNT_ON_DISK_OFFSET = 8;
      private static final int CD_RECORD_COUNT_TOTAL_OFFSET = 10;
      private static final int CD_SIZE_OFFSET = 12;
      private static final int CD_OFFSET_OFFSET = 16;
  
      public static ByteBuffer createWithModifiedCentralDirectoryInfo(
              ByteBuffer original,
              int centralDirectoryRecordCount,
              long centralDirectorySizeBytes,
              long centralDirectoryOffset) {
          ByteBuffer result = ByteBuffer.allocate(original.remaining());
          result.order(ByteOrder.LITTLE_ENDIAN);
          result.put(original.slice());
          result.flip();
          ZipUtils.setUnsignedInt16(
                  result, CD_RECORD_COUNT_ON_DISK_OFFSET, centralDirectoryRecordCount);
          ZipUtils.setUnsignedInt16(
                  result, CD_RECORD_COUNT_TOTAL_OFFSET, centralDirectoryRecordCount);
          ZipUtils.setUnsignedInt32(result, CD_SIZE_OFFSET, centralDirectorySizeBytes);
          ZipUtils.setUnsignedInt32(result, CD_OFFSET_OFFSET, centralDirectoryOffset);
          return result;
      }
  }
  