92 lines
2.6 KiB
Java
92 lines
2.6 KiB
Java
package de.measite.minidns.util;
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import java.io.ByteArrayOutputStream;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.net.IDN;
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import java.util.HashSet;
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import java.util.Arrays;
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public class NameUtil {
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public static int size(String name) {
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return name.length() + 2;
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}
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public static boolean idnEquals(String name1, String name2) {
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if (name1 == name2) return true; // catches null, null
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if (name1 == null) return false;
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if (name2 == null) return false;
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if (name1.equals(name2)) return true;
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try {
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return Arrays.equals(toByteArray(name1),toByteArray(name2));
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} catch (IOException e) {
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return false; // impossible
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}
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}
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public static byte[] toByteArray(String name) throws IOException {
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ByteArrayOutputStream baos = new ByteArrayOutputStream(64);
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DataOutputStream dos = new DataOutputStream(baos);
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for (String s: name.split("[.\u3002\uFF0E\uFF61]")) {
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byte[] buffer = IDN.toASCII(s).getBytes();
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dos.writeByte(buffer.length);
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dos.write(buffer);
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}
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dos.writeByte(0);
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dos.flush();
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return baos.toByteArray();
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}
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public static String parse(DataInputStream dis, byte data[])
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throws IOException
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{
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int c = dis.readUnsignedByte();
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if ((c & 0xc0) == 0xc0) {
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c = ((c & 0x3f) << 8) + dis.readUnsignedByte();
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HashSet<Integer> jumps = new HashSet<Integer>();
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jumps.add(c);
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return parse(data, c, jumps);
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}
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if (c == 0) {
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return "";
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}
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byte b[] = new byte[c];
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dis.readFully(b);
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String s = IDN.toUnicode(new String(b));
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String t = parse(dis, data);
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if (t.length() > 0) {
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s = s + "." + t;
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}
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return s;
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}
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public static String parse(
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byte data[],
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int offset,
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HashSet<Integer> jumps
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) {
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int c = data[offset] & 0xff;
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if ((c & 0xc0) == 0xc0) {
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c = ((c & 0x3f) << 8) + (data[offset + 1] & 0xff);
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if (jumps.contains(c)) {
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throw new IllegalStateException("Cyclic offsets detected.");
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}
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jumps.add(c);
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return parse(data, c, jumps);
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}
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if (c == 0) {
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return "";
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}
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String s = new String(data,offset + 1, c);
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String t = parse(data, offset + 1 + c, jumps);
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if (t.length() > 0) {
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s = s + "." + t;
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}
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return s;
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}
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}
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