content: /*
   * Copyright (c) 2015, 2020, Oracle and/or its affiliates.
   *
   * This program is free software; you can redistribute it and/or modify it under
   * the terms of the GNU General Public License, version 2.0, as published by the
   * Free Software Foundation.
   *
   * This program is also distributed with certain software (including but not
   * limited to OpenSSL) that is licensed under separate terms, as designated in a
   * particular file or component or in included license documentation. The
   * authors of MySQL hereby grant you an additional permission to link the
   * program and your derivative works with the separately licensed software that
   * they have included with MySQL.
   *
   * Without limiting anything contained in the foregoing, this file, which is
   * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
   * version 1.0, a copy of which can be found at
   * http://oss.oracle.com/licenses/universal-foss-exception.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   * FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
   * for more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
   */
  
  package com.mysql.cj.protocol;
  
  import java.io.EOFException;
  import java.io.FilterInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  import com.mysql.cj.Messages;
  
  /**
   * InputStream wrapper that provides methods to aggregate reads of a given size. c.f. readFully(byte[],int,int).
   */
  public class FullReadInputStream extends FilterInputStream {
  
      public FullReadInputStream(InputStream underlyingStream) {
          super(underlyingStream);
      }
  
      public InputStream getUnderlyingStream() {
          return this.in;
      }
  
      public int readFully(byte[] b) throws IOException {
          return readFully(b, 0, b.length);
      }
  
      public int readFully(byte[] b, int off, int len) throws IOException {
          if (len < 0) {
              throw new IndexOutOfBoundsException();
          }
  
          int n = 0;
  
          while (n < len) {
              int count = read(b, off + n, len - n);
  
              if (count < 0) {
                  throw new EOFException(Messages.getString("MysqlIO.EOF", new Object[] { Integer.valueOf(len), Integer.valueOf(n) }));
              }
  
              n += count;
          }
  
          return n;
      }
  
      public long skipFully(long len) throws IOException {
          if (len < 0) {
              throw new IOException(Messages.getString("MysqlIO.105"));
          }
  
          long n = 0;
  
          while (n < len) {
              long count = skip(len - n);
  
              if (count < 0) {
                  throw new EOFException(Messages.getString("MysqlIO.EOF", new Object[] { Long.valueOf(len), Long.valueOf(n) }));
              }
  
              n += count;
          }
  
          return n;
      }
  
      public int skipLengthEncodedInteger() throws IOException {
          int sw = read() & 0xff;
  
          switch (sw) {
              case 252:
                  return (int) skipFully(2) + 1;
  
              case 253:
                  return (int) skipFully(3) + 1;
  
              case 254:
                  return (int) skipFully(8) + 1;
  
              default:
                  return 1;
          }
      }
  }
  