Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | // Copyright (c) 2004 Brian Wellington (bwelling@xbill.org) |
| 2 | |
| 3 | package org.xbill.DNS; |
| 4 | |
| 5 | import java.io.*; |
| 6 | import org.xbill.DNS.utils.*; |
| 7 | |
| 8 | /** |
| 9 | * NSAP Address Record. |
| 10 | * |
| 11 | * @author Brian Wellington |
| 12 | */ |
| 13 | |
| 14 | public class NSAPRecord extends Record { |
| 15 | |
| 16 | private static final long serialVersionUID = -1037209403185658593L; |
| 17 | |
| 18 | private byte [] address; |
| 19 | |
| 20 | NSAPRecord() {} |
| 21 | |
| 22 | Record |
| 23 | getObject() { |
| 24 | return new NSAPRecord(); |
| 25 | } |
| 26 | |
| 27 | private static final byte [] |
| 28 | checkAndConvertAddress(String address) { |
| 29 | if (!address.substring(0, 2).equalsIgnoreCase("0x")) { |
| 30 | return null; |
| 31 | } |
| 32 | ByteArrayOutputStream bytes = new ByteArrayOutputStream(); |
| 33 | boolean partial = false; |
| 34 | int current = 0; |
| 35 | for (int i = 2; i < address.length(); i++) { |
| 36 | char c = address.charAt(i); |
| 37 | if (c == '.') { |
| 38 | continue; |
| 39 | } |
| 40 | int value = Character.digit(c, 16); |
| 41 | if (value == -1) { |
| 42 | return null; |
| 43 | } |
| 44 | if (partial) { |
| 45 | current += value; |
| 46 | bytes.write(current); |
| 47 | partial = false; |
| 48 | } else { |
| 49 | current = value << 4; |
| 50 | partial = true; |
| 51 | } |
| 52 | |
| 53 | } |
| 54 | if (partial) { |
| 55 | return null; |
| 56 | } |
| 57 | return bytes.toByteArray(); |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Creates an NSAP Record from the given data |
| 62 | * @param address The NSAP address. |
| 63 | * @throws IllegalArgumentException The address is not a valid NSAP address. |
| 64 | */ |
| 65 | public |
| 66 | NSAPRecord(Name name, int dclass, long ttl, String address) { |
| 67 | super(name, Type.NSAP, dclass, ttl); |
| 68 | this.address = checkAndConvertAddress(address); |
| 69 | if (this.address == null) { |
| 70 | throw new IllegalArgumentException("invalid NSAP address " + |
| 71 | address); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | void |
| 76 | rrFromWire(DNSInput in) throws IOException { |
| 77 | address = in.readByteArray(); |
| 78 | } |
| 79 | |
| 80 | void |
| 81 | rdataFromString(Tokenizer st, Name origin) throws IOException { |
| 82 | String addr = st.getString(); |
| 83 | this.address = checkAndConvertAddress(addr); |
| 84 | if (this.address == null) |
| 85 | throw st.exception("invalid NSAP address " + addr); |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Returns the NSAP address. |
| 90 | */ |
| 91 | public String |
| 92 | getAddress() { |
| 93 | return byteArrayToString(address, false); |
| 94 | } |
| 95 | |
| 96 | void |
| 97 | rrToWire(DNSOutput out, Compression c, boolean canonical) { |
| 98 | out.writeByteArray(address); |
| 99 | } |
| 100 | |
| 101 | String |
| 102 | rrToString() { |
| 103 | return "0x" + base16.toString(address); |
| 104 | } |
| 105 | |
| 106 | } |