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- package de.tudarmstadt.informatik.hostage.protocol.smbutils;
- import de.tudarmstadt.informatik.hostage.commons.HelperUtils;
- /**
- * Used to encode and decode a String into a byte array so that they can be used in NetBIOS.
- * @author Wulf Pfeiffer
- */
- public class NMBStringCoder {
- /**
- * Decodes a netbios name as byte array to its proper String value.
- * @param name bytes.
- * @return String.
- */
- public static String decodeNBNSName(byte[] name) {
- byte a_ascii = (byte) 'A';
- byte[] reducedA = new byte[name.length];
- for (int i = 0; i < name.length; i++) {
- reducedA[i] = (byte) (name[i] - a_ascii);
- }
- byte[] converted = new byte[reducedA.length / 2];
- for (int i = 0, j = 0; i < name.length && j < converted.length; i += 2, j++) {
- byte b1 = (byte) (reducedA[i] << 4);
- byte b2 = reducedA[i + 1];
- converted[j] = (byte) (b1 | b2);
- }
- return new String(converted);
- }
- /**
- * Encodes a String into its netbios name as byte array.
- * @param name.
- * @return netbios name.
- */
- public static byte[] encodeNBNSName(byte[] name) {
- byte a_ascii = (byte) 'A';
- byte[] bytes = name;
- byte[] converted = new byte[bytes.length * 2];
- for (int i = 0, j = 0; i < bytes.length && j < converted.length; i++, j += 2) {
- converted[j] = (byte) (bytes[i] >> 4);
- converted[j + 1] = (byte) (bytes[i] & 0x0F);
- }
- byte[] addedA = new byte[converted.length];
- for (int i = 0; i < converted.length; i++) {
- addedA[i] = (byte) (converted[i] + a_ascii);
- }
- return addedA;
- }
- /**
- * Wraps a NetBIOS name with the required start and end bytes and some more informations.
- * @param name netbios name.
- * @param service NBNDSService.
- * @return wrapped content.
- */
- public static byte[] wrapNBNSName(byte[] name, int service) {
- byte[] nameStart = { 0x20 };
- byte[] namePadding = null;
- if (name.length < 32) {
- int paddingLen = 32 - name.length;
- namePadding = new byte[paddingLen];
- for (int i = 0; i < namePadding.length; i += 2) {
- if (i == namePadding.length - 2) {
- byte[] serviceBytes = NBNSService.getServiceBytes(service);
- namePadding[i] = serviceBytes[0];
- namePadding[i + 1] = serviceBytes[1];
- } else {
- namePadding[i] = 0x43;
- namePadding[i + 1] = 0x041;
- }
- }
- }
- byte[] nameEnd = { 0x00 };
- return HelperUtils.concat(nameStart, name, namePadding, nameEnd);
- }
- }
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