content: /*
   * Copyright (c) 2016, 2021, 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.a;
  
  import java.io.IOException;
  import java.util.Optional;
  
  import com.mysql.cj.Messages;
  import com.mysql.cj.protocol.MessageReader;
  import com.mysql.cj.protocol.a.NativeConstants.StringLengthDataType;
  
  /**
   * A {@link MessageReader} which reads a full packet
   * built from sequence of it's on-wire parts.
   * See http://dev.mysql.com/doc/internals/en/sending-more-than-16mbyte.html
   */
  public class MultiPacketReader implements MessageReader<NativePacketHeader, NativePacketPayload> {
  
      private MessageReader<NativePacketHeader, NativePacketPayload> packetReader;
  
      public MultiPacketReader(MessageReader<NativePacketHeader, NativePacketPayload> packetReader) {
          this.packetReader = packetReader;
      }
  
      @Override
      public NativePacketHeader readHeader() throws IOException {
          return this.packetReader.readHeader();
      }
  
      @Override
      public NativePacketHeader probeHeader() throws IOException {
          return this.packetReader.probeHeader();
      }
  
      @Override
      public NativePacketPayload readMessage(Optional<NativePacketPayload> reuse, NativePacketHeader header) throws IOException {
  
          int packetLength = header.getMessageSize();
          NativePacketPayload buf = this.packetReader.readMessage(reuse, header);
  
          if (packetLength == NativeConstants.MAX_PACKET_SIZE) { // it's a multi-packet
  
              buf.setPosition(NativeConstants.MAX_PACKET_SIZE);
  
              NativePacketPayload multiPacket = null;
              int multiPacketLength = -1;
              byte multiPacketSeq = getMessageSequence();
  
              do {
                  NativePacketHeader hdr = readHeader();
                  multiPacketLength = hdr.getMessageSize();
  
                  if (multiPacket == null) {
                      multiPacket = new NativePacketPayload(multiPacketLength);
                  }
  
                  multiPacketSeq++;
                  if (multiPacketSeq != hdr.getMessageSequence()) {
                      throw new IOException(Messages.getString("PacketReader.10"));
                  }
  
                  this.packetReader.readMessage(Optional.of(multiPacket), hdr);
  
                  buf.writeBytes(StringLengthDataType.STRING_FIXED, multiPacket.getByteBuffer(), 0, multiPacketLength);
  
              } while (multiPacketLength == NativeConstants.MAX_PACKET_SIZE);
  
              buf.setPosition(0);
          }
  
          return buf;
      }
  
      @Override
      public NativePacketPayload probeMessage(Optional<NativePacketPayload> reuse, NativePacketHeader header) throws IOException {
  
          int packetLength = header.getMessageSize();
          NativePacketPayload buf = this.packetReader.probeMessage(reuse, header);
  
          if (packetLength == NativeConstants.MAX_PACKET_SIZE) { // it's a multi-packet
  
              buf.setPosition(NativeConstants.MAX_PACKET_SIZE);
  
              NativePacketPayload multiPacket = null;
              int multiPacketLength = -1;
              byte multiPacketSeq = getMessageSequence();
  
              do {
                  NativePacketHeader hdr = readHeader();
                  multiPacketLength = hdr.getMessageSize();
  
                  if (multiPacket == null) {
                      multiPacket = new NativePacketPayload(multiPacketLength);
                  }
  
                  multiPacketSeq++;
                  if (multiPacketSeq != hdr.getMessageSequence()) {
                      throw new IOException(Messages.getString("PacketReader.10"));
                  }
  
                  this.packetReader.probeMessage(Optional.of(multiPacket), hdr);
  
                  buf.writeBytes(StringLengthDataType.STRING_FIXED, multiPacket.getByteBuffer(), 0, multiPacketLength);
  
              } while (multiPacketLength == NativeConstants.MAX_PACKET_SIZE);
  
              buf.setPosition(0);
          }
  
          return buf;
      }
  
      @Override
      public byte getMessageSequence() {
          return this.packetReader.getMessageSequence();
      }
  
      @Override
      public void resetMessageSequence() {
          this.packetReader.resetMessageSequence();
      }
  
      @Override
      public MessageReader<NativePacketHeader, NativePacketPayload> undecorateAll() {
          return this.packetReader.undecorateAll();
      }
  
      @Override
      public MessageReader<NativePacketHeader, NativePacketPayload> undecorate() {
          return this.packetReader;
      }
  
  }
  