content: /*
   * Copyright (C) 2018 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.server.backup.encryption.chunking;
  
  import com.android.internal.util.Preconditions;
  
  /** Representation of a range of bytes to be downloaded. */
  final class ByteRange {
      private final long mStart;
      private final long mEnd;
  
      /** Creates a range of bytes which includes {@code mStart} and {@code mEnd}. */
      ByteRange(long start, long end) {
          Preconditions.checkArgument(start >= 0);
          Preconditions.checkArgument(end >= start);
          mStart = start;
          mEnd = end;
      }
  
      /** Returns the start of the {@code ByteRange}. The start is included in the range. */
      long getStart() {
          return mStart;
      }
  
      /** Returns the end of the {@code ByteRange}. The end is included in the range. */
      long getEnd() {
          return mEnd;
      }
  
      /** Returns the number of bytes included in the {@code ByteRange}. */
      int getLength() {
          return (int) (mEnd - mStart + 1);
      }
  
      /** Creates a new {@link ByteRange} from {@code mStart} to {@code mEnd + length}. */
      ByteRange extend(long length) {
          Preconditions.checkArgument(length > 0);
          return new ByteRange(mStart, mEnd + length);
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (!(o instanceof ByteRange)) {
              return false;
          }
  
          ByteRange byteRange = (ByteRange) o;
          return (mEnd == byteRange.mEnd && mStart == byteRange.mStart);
      }
  
      @Override
      public int hashCode() {
          int result = 17;
          result = 31 * result + (int) (mStart ^ (mStart >>> 32));
          result = 31 * result + (int) (mEnd ^ (mEnd >>> 32));
          return result;
      }
  
      @Override
      public String toString() {
          return String.format("ByteRange{mStart=%d, mEnd=%d}", mStart, mEnd);
      }
  }
  