Java IO.pdf - Nguyen Dang Binh

}
}
else if (args[firstFile].equals("-password")) {
password = args[firstFile+1];
firstFile++;
}
Java I/O
for (int i = firstFile; i < args.length; i++) {
try {
InputStream in = new FileInputStream(args[i]);
dump(in, System.out, mode, bigEndian, deflated, gzipped, password);
}
if (i < args.length-1) { // more files to dump
System.out.println();
System.out.println("--------------------------------------");
System.out.println();
}
}
catch (IOException e) {
System.err.println(e);
e.printStackTrace();
}
public static void dump(InputStream in, OutputStream out, int mode,
boolean bigEndian, boolean deflated, boolean gzipped, String password)
throws IOException {
// The reference variable in may point to several different objects
// within the space of the next few lines.
if (password != null) {
// Create a key.
try {
byte[] desKeyData = password.getBytes();
DESKeySpec desKeySpec = new DESKeySpec(desKeyData);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey desKey = keyFactory.generateSecret(desKeySpec);
// Use Data Encryption Standard.
Cipher des = Cipher.getInstance("DES/ECB/PKCS5Padding");
des.init(Cipher.DECRYPT_MODE, desKey);
in = new CipherInputStream(in, des);
}
catch (GeneralSecurityException e) {
throw new IOException(e.getMessage());
}
}
if (deflated) {
in = new InflaterInputStream(in);
}
else if (gzipped) {
in = new GZIPInputStream(in);
}
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