| // Copyright (c) 2004-2009 Brian Wellington (bwelling@xbill.org) |
| |
| package org.xbill.DNS; |
| |
| /** |
| * Routines for deal with the lists of types found in NSEC/NSEC3 records. |
| * |
| * @author Brian Wellington |
| */ |
| |
| import java.io.*; |
| import java.util.*; |
| |
| final class TypeBitmap implements Serializable { |
| |
| private static final long serialVersionUID = -125354057735389003L; |
| |
| private TreeSet types; |
| |
| private |
| TypeBitmap() { |
| types = new TreeSet(); |
| } |
| |
| public |
| TypeBitmap(int [] array) { |
| this(); |
| for (int i = 0; i < array.length; i++) { |
| Type.check(array[i]); |
| types.add(new Integer(array[i])); |
| } |
| } |
| |
| public |
| TypeBitmap(DNSInput in) throws WireParseException { |
| this(); |
| int lastbase = -1; |
| while (in.remaining() > 0) { |
| if (in.remaining() < 2) |
| throw new WireParseException |
| ("invalid bitmap descriptor"); |
| int mapbase = in.readU8(); |
| if (mapbase < lastbase) |
| throw new WireParseException("invalid ordering"); |
| int maplength = in.readU8(); |
| if (maplength > in.remaining()) |
| throw new WireParseException("invalid bitmap"); |
| for (int i = 0; i < maplength; i++) { |
| int current = in.readU8(); |
| if (current == 0) |
| continue; |
| for (int j = 0; j < 8; j++) { |
| if ((current & (1 << (7 - j))) == 0) |
| continue; |
| int typecode = mapbase * 256 + + i * 8 + j; |
| types.add(Mnemonic.toInteger(typecode)); |
| } |
| } |
| } |
| } |
| |
| public |
| TypeBitmap(Tokenizer st) throws IOException { |
| this(); |
| while (true) { |
| Tokenizer.Token t = st.get(); |
| if (!t.isString()) |
| break; |
| int typecode = Type.value(t.value); |
| if (typecode < 0) { |
| throw st.exception("Invalid type: " + t.value); |
| } |
| types.add(Mnemonic.toInteger(typecode)); |
| } |
| st.unget(); |
| } |
| |
| public int [] |
| toArray() { |
| int [] array = new int[types.size()]; |
| int n = 0; |
| for (Iterator it = types.iterator(); it.hasNext(); ) |
| array[n++] = ((Integer)it.next()).intValue(); |
| return array; |
| } |
| |
| public String |
| toString() { |
| StringBuffer sb = new StringBuffer(); |
| for (Iterator it = types.iterator(); it.hasNext(); ) { |
| int t = ((Integer)it.next()).intValue(); |
| sb.append(Type.string(t)); |
| if (it.hasNext()) |
| sb.append(' '); |
| } |
| return sb.toString(); |
| } |
| |
| private static void |
| mapToWire(DNSOutput out, TreeSet map, int mapbase) { |
| int arraymax = (((Integer)map.last()).intValue()) & 0xFF; |
| int arraylength = (arraymax / 8) + 1; |
| int [] array = new int[arraylength]; |
| out.writeU8(mapbase); |
| out.writeU8(arraylength); |
| for (Iterator it = map.iterator(); it.hasNext(); ) { |
| int typecode = ((Integer)it.next()).intValue(); |
| array[(typecode & 0xFF) / 8] |= (1 << ( 7 - typecode % 8)); |
| } |
| for (int j = 0; j < arraylength; j++) |
| out.writeU8(array[j]); |
| } |
| |
| public void |
| toWire(DNSOutput out) { |
| if (types.size() == 0) |
| return; |
| |
| int mapbase = -1; |
| TreeSet map = new TreeSet(); |
| |
| for (Iterator it = types.iterator(); it.hasNext(); ) { |
| int t = ((Integer)it.next()).intValue(); |
| int base = t >> 8; |
| if (base != mapbase) { |
| if (map.size() > 0) { |
| mapToWire(out, map, mapbase); |
| map.clear(); |
| } |
| mapbase = base; |
| } |
| map.add(new Integer(t)); |
| } |
| mapToWire(out, map, mapbase); |
| } |
| |
| public boolean |
| empty() { |
| return types.isEmpty(); |
| } |
| |
| public boolean |
| contains(int typecode) { |
| return types.contains(Mnemonic.toInteger(typecode)); |
| } |
| |
| } |