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/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import jdk.test.lib.Asserts;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
import java.security.DigestInputStream;
import java.security.MessageDigest;
/**
* @test
* @bug 6587699
* @summary Document DigestInputStream behavior when skip() or mark() / reset() is used
* @library /test/lib
*/
public class TestSkipAndReset {
public static void main(String[] args) throws Exception {
byte[] data = "1234567890".getBytes(StandardCharsets.UTF_8);
MessageDigest md = MessageDigest.getInstance("SHA-256");
DigestInputStream dis = new DigestInputStream(new ByteArrayInputStream(data), md);
dis.read(); // read 1
dis.read(new byte[2], 0, 1); // read 2
dis.skip(3); // skip 3 4 5
dis.mark(10); // remember 5
dis.read(new byte[2]); // read 6 7
dis.skip(1); // skip 8
dis.read(); // read 9
dis.reset(); // back to 5
dis.readNBytes(3); // read 6 7 8
dis.reset(); // back to 5
dis.skip(2); // skip 6 7
dis.readAllBytes(); // read 8 9 0
dis.reset(); // back to 5
dis.skip(3); // skip 6 7 8
dis.transferTo(new ByteArrayOutputStream()); // read 9 0
byte[] hash = md.digest();
byte[] directHash = md.digest("1267967889090".getBytes(StandardCharsets.UTF_8));
Asserts.assertTrue(MessageDigest.isEqual(hash, directHash));
}
}
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