/**
* Converts a token to a sequence of codepoints.
*
* @param token token
* @return codepoints
*/
public static int[] cps(final byte[] token) {
int pos = 0;
final int len = token.length;
final int[] cp = new int[len];
for (int i = 0; i < len; i += cl(token, i)) cp[pos++] = cp(token, i);
return pos < len ? Arrays.copyOf(cp, pos) : cp;
}
/**
* Ecrit la piece donnée dans le fichier temporaire sur le disque
*
* @param piece : pièce à écrire
* @param num : numéros de la pièce
*/
private synchronized void writePieceTmpFile(byte[] piece, int num) {
if (num < 0 || num >= this.nbPieces()) {
throw new IllegalArgumentException();
}
if (piece.length > _piecesize) {
throw new IllegalArgumentException();
}
try {
RandomAccessFile writer_tmp = new RandomAccessFile(this, "rw");
FileChannel writer = writer_tmp.getChannel();
int index_piece = ((int) this.length() - this.headerSize()) / _piecesize;
if (piece.length < _piecesize) {
piece = Arrays.copyOf(piece, _piecesize);
}
Tools.write(writer, 4 + _key.length() + 4 + 4 + 4 * num, index_piece);
Tools.write(writer, this.headerSize() + _piecesize * index_piece, piece);
writer.force(true);
writer_tmp.close();
} catch (Exception e) {
System.out.println("Unable to write tmp file piece");
e.printStackTrace();
}
}
/**
* Initialises the Ciphers for both encryption and decryption using the generated or supplied
* secret key.
*
* @param algorithm
* @param secret
* @throws Exception
*/
private void initSymCiphers(String algorithm, SecretKey secret) throws Exception {
log.debug("initializing symmetric ciphers (pool size=%d)", cipher_pool_size);
for (int i = 0; i < cipher_pool_size; i++) {
encoding_ciphers[i] =
symProvider != null && !symProvider.trim().isEmpty()
? Cipher.getInstance(algorithm, symProvider)
: Cipher.getInstance(algorithm);
encoding_ciphers[i].init(Cipher.ENCRYPT_MODE, secret);
decoding_ciphers[i] =
symProvider != null && !symProvider.trim().isEmpty()
? Cipher.getInstance(algorithm, symProvider)
: Cipher.getInstance(algorithm);
decoding_ciphers[i].init(Cipher.DECRYPT_MODE, secret);
encoding_locks[i] = new ReentrantLock();
decoding_locks[i] = new ReentrantLock();
}
// set the version
MessageDigest digest = MessageDigest.getInstance("MD5");
digest.reset();
digest.update(secret.getEncoded());
byte[] tmp = digest.digest();
symVersion = Arrays.copyOf(tmp, tmp.length);
// symVersion = byteArrayToHexString(digest.digest());
log.debug("initialized symmetric ciphers with secret key (" + symVersion.length + " bytes)");
}
/**
* Chops a token to the specified length and adds dots.
*
* @param token token to be chopped
* @param max maximum length
* @return chopped token
*/
public static byte[] chop(final byte[] token, final int max) {
if (token.length <= max) return token;
final byte[] tt = Arrays.copyOf(token, max);
if (max > 2) tt[max - 3] = '.';
if (max > 1) tt[max - 2] = '.';
if (max > 0) tt[max - 1] = '.';
return tt;
}
/**
* Normalizes all whitespace occurrences from the specified token.
*
* @param token token
* @return normalized token
*/
public static byte[] norm(final byte[] token) {
final int l = token.length;
final byte[] tmp = new byte[l];
int c = 0;
boolean ws1 = true;
for (final byte t : token) {
final boolean ws2 = ws(t);
if (ws2 && ws1) continue;
tmp[c++] = ws2 ? (byte) ' ' : t;
ws1 = ws2;
}
if (c > 0 && ws(tmp[c - 1])) --c;
return c == l ? tmp : Arrays.copyOf(tmp, c);
}
private void setSymVersion(byte[] symVersion) {
this.symVersion = Arrays.copyOf(symVersion, symVersion.length);
}