| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 |
| * |
| * https://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 org.apache.directory.api.ldap.codec.api; |
| |
| |
| import java.io.InputStream; |
| import java.nio.ByteBuffer; |
| |
| import org.apache.directory.api.asn1.DecoderException; |
| import org.apache.directory.api.asn1.ber.Asn1Decoder; |
| import org.apache.directory.api.asn1.ber.tlv.TLVStateEnum; |
| import org.apache.directory.api.i18n.I18n; |
| import org.apache.directory.api.ldap.model.message.Message; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * The LdapDecoder decodes ASN.1 BER encoded PDUs into LDAP messages |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class LdapDecoder |
| { |
| /** The logger */ |
| private static final Logger LOG = LoggerFactory.getLogger( LdapDecoder.class ); |
| |
| /** The name of the LdapSession's attribute for the LDAP container used during the decoding */ |
| public static final String MESSAGE_CONTAINER_ATTR = "LDAP-container"; |
| |
| /** The maximum PDU size, stored into the LDAPSession's attribute */ |
| public static final String MAX_PDU_SIZE_ATTR = "LDAP-maxPduSize"; |
| |
| |
| /** |
| * Creates an instance of a Ldap Decoder implementation. |
| */ |
| public LdapDecoder() |
| { |
| } |
| |
| |
| /** |
| * Decodes a PDU from an input stream into a Ldap message container. We can only |
| * decode one complete message. |
| * |
| * @param in The input stream to read and decode PDU bytes from |
| * @param container The LdapMessageContainer containing the message to decode |
| * @return return The decoded message |
| * @throws DecoderException If the decoding failed |
| */ |
| public Message decode( InputStream in, LdapMessageContainer<? extends Message> container ) |
| throws DecoderException |
| { |
| try |
| { |
| int amount; |
| |
| while ( in.available() > 0 ) |
| { |
| byte[] buf = new byte[in.available()]; |
| |
| amount = in.read( buf ); |
| |
| if ( amount == -1 ) |
| { |
| break; |
| } |
| |
| Asn1Decoder.decode( ByteBuffer.wrap( buf, 0, amount ), container ); |
| } |
| } |
| catch ( Exception e ) |
| { |
| String message = I18n.err( I18n.ERR_05204_LDAP_DECODER_FAILURE, e.getLocalizedMessage() ); |
| LOG.error( message ); |
| throw new DecoderException( message, e ); |
| } |
| |
| if ( container.getState() == TLVStateEnum.PDU_DECODED ) |
| { |
| if ( LOG.isDebugEnabled() ) |
| { |
| LOG.debug( I18n.msg( I18n.MSG_5200_DECODED_LDAP_MESSAGE, container ) ); |
| } |
| |
| return container.getMessage(); |
| } |
| else |
| { |
| LOG.error( I18n.err( I18n.ERR_05205_PDU_DOES_NOT_CONTAIN_ENOUGH_DATA ) ); |
| throw new DecoderException( I18n.err( I18n.ERR_05206_INPUT_STREAM_TOO_SHORT_PDU ) ); |
| } |
| } |
| } |