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/*
 * Copyright (C) 2014 Square, Inc.
 *
 * 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.squareup.okhttp.internal.okio;


final class Util {
  /** A cheap and type-safe constant for the UTF-8 Charset. */
  public static final String UTF_8 = "UTF-8";

  private Util() {
  }

  public static void checkOffsetAndCount(long arrayLength, long offset, long count) {
    if ((offset | count) < 0 || offset > arrayLength || arrayLength - offset < count) {
      throw new ArrayIndexOutOfBoundsException();
    }
  }

  public static int reverseBytesShort(short s) {
    int i = s & 0xffff;
    return (i & 0xff00) >>> 8
        |  (i & 0x00ff) << 8;
  }

  public static int reverseBytesInt(int i) {
    return (i & 0xff000000) >>> 24
        |  (i & 0x00ff0000) >>> 8
        |  (i & 0x0000ff00) << 8
        |  (i & 0x000000ff) << 24;
  }

  /**
   * Throws {@code t}, even if the declared throws clause doesn't permit it.
   * This is a terrible – but terribly convenient – hack that makes it easy to
   * catch and rethrow exceptions after cleanup. See Java Puzzlers #43.
   */
  public static void sneakyRethrow(Throwable t) {
    Util.sneakyThrow2(t);
  }

  @SuppressWarnings("unchecked")
  private static  void sneakyThrow2(Throwable t) throws T {
    throw (T) t;
  }
}