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Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. Guava has only one code dependency - javax.annotation, per the JSR-305 spec.

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/*
 * Copyright (C) 2009 The Guava Authors
 *
 * 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.google.common.io;

import java.io.DataInput;
import java.io.IOException;

/**
 * An extension of {@code DataInput} for reading from in-memory byte arrays; its
 * methods offer identical functionality but do not throw {@link IOException}.
 *
 * Warning: The caller is responsible for not attempting to read past
 * the end of the array. If any method encounters the end of the array
 * prematurely, it throws {@link IllegalStateException} to signify programmer
 * error. This behavior is a technical violation of the supertype's
 * contract, which specifies a checked exception.
 *
 * @author Kevin Bourrillion
 * @since 1.0
 */
public interface ByteArrayDataInput extends DataInput {
  void readFully(byte b[]);

  void readFully(byte b[], int off, int len);

  int skipBytes(int n);

  boolean readBoolean();

  byte readByte();

  int readUnsignedByte();

  short readShort();

  int readUnsignedShort();

  char readChar();

  int readInt();

  long readLong();

  float readFloat();

  double readDouble();

  String readLine();

  String readUTF();
}