private void digest(MessageDigest[] algorithms, Resource r) throws Exception {
InputStream in = r.openInputStream();
byte[] data = new byte[BUFFER_SIZE];
int size = in.read(data);
while (size > 0) {
for (int a = 0; a < algorithms.length; a++) {
if (algorithms[a] != null) {
algorithms[a].update(data, 0, size);
}
}
size = in.read(data);
}
}