/**
* Verify that the computed checksum is the same whether the buffer is backed by an array or not
* when the checksum is computed for only a region of the buffer (native heap buffer version).
*/
public void test_checksum05_direct() {
byte[] data = new byte[100];
r.nextBytes(data);
Adler32 adler32 = new Adler32();
adler32.update(data, 20, 100 - 10 - 20);
final int expectedChecksum = (int) adler32.getValue();
assertEquals(expectedChecksum, chk.checksum(ByteBuffer.wrap(data), 20, data.length - 10));
ByteBuffer direct = ByteBuffer.allocateDirect(data.length);
direct.put(data);
assertEquals(expectedChecksum, chk.checksum(direct, 20, data.length - 10));
}
/** Test verifies that the mark, position and limit are unchanged by the checksum operation. */
public void test_checksum03() {
byte[] data = new byte[100];
r.nextBytes(data);
ByteBuffer buf = ByteBuffer.wrap(data);
// set the limit.
buf.limit(20);
/*
* set the mark (we have to choose a mark less than the position we will
* set and test below or the mark will be discarded when we set the
* position).
*/
buf.position(9);
buf.mark();
// set the position.
buf.position(12);
chk.checksum(buf, 0, data.length);
// verify limit unchanged.
assertEquals(20, buf.limit());
// verify position unchanged.
assertEquals(12, buf.position());
// reset the buffer to the mark and verify the mark was not changed.
buf.reset();
assertEquals(9, buf.position());
}
/** Test verifies that only the specified region of the buffer is used to compute the checksum. */
public void test_checksum02() {
byte[] data = new byte[100];
r.nextBytes(data);
Adler32 adler32 = new Adler32();
adler32.update(data, 10, 90);
final int expectedChecksum = (int) adler32.getValue();
assertEquals(expectedChecksum, chk.checksum(ByteBuffer.wrap(data), 10, data.length));
}
