pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/PCEPEROSubobjectParser.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.protocol.pcep.impl;
   9
  10 import java.util.ArrayList;
  11 import java.util.List;
  12
  13 import org.opendaylight.protocol.pcep.PCEPDeserializerException;
  14 import org.opendaylight.protocol.pcep.impl.subobject.EROExplicitExclusionRouteSubobjectParser;
  15 import org.opendaylight.protocol.pcep.impl.subobject.EROLabelSubobjectParser;
  16 import org.opendaylight.protocol.pcep.impl.subobject.EROPathKeyWith128PCEIDSubobjectParser;
  17 import org.opendaylight.protocol.pcep.impl.subobject.EROPathKeyWith32PCEIDSubobjectParser;
  18 import org.opendaylight.protocol.pcep.impl.subobject.EROUnnumberedInterfaceSubobjectParser;
  19 import org.opendaylight.protocol.pcep.subobject.EROAsNumberSubobject;
  20 import org.opendaylight.protocol.pcep.subobject.EROExplicitExclusionRouteSubobject;
  21 import org.opendaylight.protocol.pcep.subobject.EROLabelSubobject;
  22 import org.opendaylight.protocol.pcep.subobject.EROPathKeyWith128PCEIDSubobject;
  23 import org.opendaylight.protocol.pcep.subobject.EROPathKeyWith32PCEIDSubobject;
  24 import org.opendaylight.protocol.pcep.subobject.EROUnnumberedInterfaceSubobject;
  25 import org.opendaylight.protocol.pcep.subobject.ExplicitRouteSubobject;
  26 import org.opendaylight.protocol.util.ByteArray;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 /**
  31  * Parser for {@link org.opendaylight.protocol.pcep.PCEPSubobject PCEPSubobject}
  32  */
  33 public class PCEPEROSubobjectParser {
  34
  35         private static final Logger logger = LoggerFactory.getLogger(PCEPEROSubobjectParser.class);
  36
  37         /**
  38          * Type identifier for {@link org.opendaylight.protocol.pcep.PCEPSubobject PCEPSubobject}
  39          */
  40         public enum PCEPSubobjectType {
  41                 IPv4_PREFIX(1), IPv6_PREFIX(2), LABEL(3), UNNUMBERED_INTERFACE_ID(4), AS_NUMBER(32), EXRS(33), PROTECTION(37), PK_32(64), PK_128(65);
  42
  43                 private final int indicator;
  44
  45                 PCEPSubobjectType(final int indicator) {
  46                         this.indicator = indicator;
  47                 }
  48
  49                 public int getIndicator() {
  50                         return this.indicator;
  51                 }
  52
  53                 public static PCEPSubobjectType getFromInt(final int type) throws PCEPDeserializerException {
  54
  55                         for (final PCEPSubobjectType type_e : PCEPSubobjectType.values()) {
  56                                 if (type_e.getIndicator() == type) {
  57                                         return type_e;
  58                                 }
  59                         }
  60
  61                         throw new PCEPDeserializerException("Unknown Subobject type. Passed: " + type + "; Known: " + PCEPSubobjectType.values() + ".");
  62                 }
  63         }
  64
  65         /*
  66          * Fields lengths in Bytes
  67          */
  68         public static final int TYPE_FLAG_F_LENGTH = 1;
  69         public static final int LENGTH_F_LENGTH = 1;
  70
  71         /*
  72          * Fields offsets in Bytes
  73          */
  74         public static final int TYPE_FLAG_F_OFFSET = 0;
  75         public static final int LENGTH_F_OFFSET = TYPE_FLAG_F_OFFSET + TYPE_FLAG_F_LENGTH;
  76         public static final int SO_CONTENTS_OFFSET = LENGTH_F_OFFSET + LENGTH_F_LENGTH;
  77
  78         public static List<ExplicitRouteSubobject> parse(final byte[] bytes) throws PCEPDeserializerException {
  79                 if (bytes == null) {
  80                         throw new IllegalArgumentException("Byte array is mandatory.");
  81                 }
  82
  83                 final List<ExplicitRouteSubobject> subobjsList = new ArrayList<ExplicitRouteSubobject>();
  84                 boolean loose_flag;
  85                 PCEPSubobjectType type;
  86                 byte[] soContentsBytes;
  87                 int length;
  88                 int offset = 0;
  89
  90                 while (offset < bytes.length) {
  91
  92                         loose_flag = ((bytes[offset + TYPE_FLAG_F_OFFSET] & (1 << 7)) != 0) ? true : false;
  93                         length = ByteArray.bytesToInt(ByteArray.subByte(bytes, offset + LENGTH_F_OFFSET, LENGTH_F_LENGTH));
  94
  95                         type = PCEPSubobjectType.getFromInt((bytes[offset + TYPE_FLAG_F_OFFSET] & 0xff) & ~(1 << 7));
  96
  97                         if (length > bytes.length - offset) {
  98                                 throw new PCEPDeserializerException("Wrong length specified. Passed: " + length + "; Expected: <= "
  99                                                 + (bytes.length - offset));
 100                         }
 101
 102                         soContentsBytes = new byte[length - SO_CONTENTS_OFFSET];
 103                         System.arraycopy(bytes, offset + SO_CONTENTS_OFFSET, soContentsBytes, 0, length - SO_CONTENTS_OFFSET);
 104
 105                         logger.debug("Attempt to parse subobject from bytes: {}", ByteArray.bytesToHexString(soContentsBytes));
 106                         final ExplicitRouteSubobject subObj = parseSpecificSubobject(type, soContentsBytes, loose_flag);
 107                         logger.debug("Subobject was parsed. {}", subObj);
 108
 109                         subobjsList.add(subObj);
 110
 111                         offset += length;
 112                 }
 113
 114                 return subobjsList;
 115         }
 116
 117         public static byte[] put(final List<ExplicitRouteSubobject> objsToSerialize) {
 118                 final List<byte[]> bytesList = new ArrayList<byte[]>(objsToSerialize.size());
 119
 120                 int length = 0;
 121                 for (final ExplicitRouteSubobject obj : objsToSerialize) {
 122                         final byte[] bytes = put(obj);
 123                         length += bytes.length;
 124                         bytesList.add(bytes);
 125                 }
 126
 127                 final byte[] retBytes = new byte[length];
 128
 129                 int offset = 0;
 130                 for (final byte[] bytes : bytesList) {
 131                         System.arraycopy(bytes, 0, retBytes, offset, bytes.length);
 132                         offset += bytes.length;
 133                 }
 134
 135                 return retBytes;
 136         }
 137
 138         public static byte[] put(final ExplicitRouteSubobject objToSerialize) {
 139                 int typeIndicator = 0;
 140
 141                 byte[] soContentsBytes = null;
 142
 143                 // if (objToSerialize instanceof EROIPPrefixSubobject<?>
 144                 // && ((EROIPPrefixSubobject<?>) objToSerialize).getPrefix() instanceof IPv4Prefix) {
 145                 // typeIndicator = PCEPSubobjectType.IPv4_PREFIX.getIndicator();
 146                 // // soContentsBytes = EROIpPrefixSubobjectParser.put(objToSerialize);
 147                 // } else if (objToSerialize instanceof EROIPPrefixSubobject<?>
 148                 // && ((EROIPPrefixSubobject<?>) objToSerialize).getPrefix() instanceof IPv6Prefix) {
 149                 // typeIndicator = PCEPSubobjectType.IPv6_PREFIX.getIndicator();
 150                 // // soContentsBytes = EROIPv6PrefixSubobjectParser.put(objToSerialize);
 151                 // } else
 152                 if (objToSerialize instanceof EROAsNumberSubobject) {
 153                         typeIndicator = PCEPSubobjectType.AS_NUMBER.getIndicator();
 154                         // soContentsBytes = EROAsNumberSubobjectParser.put(objToSerialize);
 155                 } else if (objToSerialize instanceof EROUnnumberedInterfaceSubobject) {
 156                         typeIndicator = PCEPSubobjectType.UNNUMBERED_INTERFACE_ID.getIndicator();
 157                         soContentsBytes = EROUnnumberedInterfaceSubobjectParser.put(objToSerialize);
 158                 } else if (objToSerialize instanceof EROLabelSubobject) {
 159                         typeIndicator = PCEPSubobjectType.LABEL.getIndicator();
 160                         soContentsBytes = EROLabelSubobjectParser.put((EROLabelSubobject) objToSerialize);
 161                 } else if (objToSerialize instanceof EROExplicitExclusionRouteSubobject) {
 162                         typeIndicator = PCEPSubobjectType.EXRS.getIndicator();
 163                         soContentsBytes = EROExplicitExclusionRouteSubobjectParser.put((EROExplicitExclusionRouteSubobject) objToSerialize);
 164                 } else if (objToSerialize instanceof EROPathKeyWith32PCEIDSubobject) {
 165                         typeIndicator = PCEPSubobjectType.PK_32.getIndicator();
 166                         soContentsBytes = EROPathKeyWith32PCEIDSubobjectParser.put((EROPathKeyWith32PCEIDSubobject) objToSerialize);
 167                 } else if (objToSerialize instanceof EROPathKeyWith128PCEIDSubobject) {
 168                         typeIndicator = PCEPSubobjectType.PK_128.getIndicator();
 169                         soContentsBytes = EROPathKeyWith128PCEIDSubobjectParser.put((EROPathKeyWith128PCEIDSubobject) objToSerialize);
 170                 } else {
 171                         throw new IllegalArgumentException("Unknown instance of PCEPSubobject. Passed: " + objToSerialize.getClass() + ".");
 172                 }
 173
 174                 final byte[] bytes = new byte[SO_CONTENTS_OFFSET + soContentsBytes.length];
 175
 176                 bytes[TYPE_FLAG_F_OFFSET] = (byte) (ByteArray.cutBytes(ByteArray.intToBytes(typeIndicator), (Integer.SIZE / 8) - TYPE_FLAG_F_LENGTH)[0] | (objToSerialize.isLoose() ? 1 << 7
 177                                 : 0));
 178                 bytes[LENGTH_F_OFFSET] = ByteArray.cutBytes(ByteArray.intToBytes(soContentsBytes.length + SO_CONTENTS_OFFSET), (Integer.SIZE / 8)
 179                                 - LENGTH_F_LENGTH)[0];
 180
 181                 System.arraycopy(soContentsBytes, 0, bytes, SO_CONTENTS_OFFSET, soContentsBytes.length);
 182
 183                 return bytes;
 184         }
 185
 186         private static ExplicitRouteSubobject parseSpecificSubobject(final PCEPSubobjectType type, final byte[] soContentsBytes,
 187                         final boolean loose_flag) throws PCEPDeserializerException {
 188
 189                 switch (type) {
 190                 case IPv4_PREFIX:
 191                         // return EROIpPrefixSubobjectParser.parse(soContentsBytes, loose_flag);
 192                 case IPv6_PREFIX:
 193                         // return EROIPv6PrefixSubobjectParser.parse(soContentsBytes, loose_flag);
 194                 case UNNUMBERED_INTERFACE_ID:
 195                         return EROUnnumberedInterfaceSubobjectParser.parse(soContentsBytes, loose_flag);
 196                 case AS_NUMBER:
 197                         // return EROAsNumberSubobjectParser.parse(soContentsBytes, loose_flag);
 198                 case LABEL:
 199                         return EROLabelSubobjectParser.parse(soContentsBytes, loose_flag);
 200                 case EXRS:
 201                         return EROExplicitExclusionRouteSubobjectParser.parse(soContentsBytes, loose_flag);
 202                 case PK_32:
 203                         return EROPathKeyWith32PCEIDSubobjectParser.parse(soContentsBytes, loose_flag);
 204                 case PK_128:
 205                         return EROPathKeyWith128PCEIDSubobjectParser.parse(soContentsBytes, loose_flag);
 206                 default:
 207                         throw new PCEPDeserializerException("Unknown Subobject type. Passed: " + type + ".");
 208                 }
 209         }
 210 }