package de.measite.minidns.util; import java.io.ByteArrayOutputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.net.IDN; import java.util.HashSet; public class NameUtil { public static int size(String name) { return name.length() + 2; } public static byte[] toByteArray(String name) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(64); DataOutputStream dos = new DataOutputStream(baos); for (String s: name.split("[.\u3002\uFF0E\uFF61]")) { byte[] buffer = IDN.toASCII(s).getBytes(); dos.writeByte(buffer.length); dos.write(buffer); } dos.writeByte(0); dos.flush(); return baos.toByteArray(); } public static String parse(DataInputStream dis, byte data[]) throws IOException { int c = dis.readUnsignedByte(); if ((c & 0xc0) == 0xc0) { c = ((c & 0x3f) << 8) + dis.readUnsignedByte(); HashSet jumps = new HashSet(); jumps.add(c); return parse(data, c, jumps); } if (c == 0) { return ""; } byte b[] = new byte[c]; dis.readFully(b); String s = IDN.toUnicode(new String(b)); String t = parse(dis, data); if (t.length() > 0) { s = s + "." + t; } return s; } public static String parse( byte data[], int offset, HashSet jumps ) { int c = data[offset] & 0xff; if ((c & 0xc0) == 0xc0) { c = ((c & 0x3f) << 8) + data[offset + 1]; if (jumps.contains(c)) { throw new IllegalStateException("Cyclic offsets detected."); } jumps.add(c); return parse(data, c, jumps); } if (c == 0) { return ""; } String s = new String(data,offset + 1, c); String t = parse(data, offset + 1 + c, jumps); if (t.length() > 0) { s = s + "." + t; } return s; } }