| /* |
| * Copyright (c) 2001, 2017, 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. |
| */ |
| |
| /* |
| * @test |
| * @bug 4416800 |
| * @summary Checks that ImageInputStreamImpl.readBit and readBits handle the bit |
| * offset correctly |
| */ |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import javax.imageio.stream.FileCacheImageInputStream; |
| import javax.imageio.stream.ImageInputStream; |
| |
| public class ReadBitsTest { |
| public static void main(String[] args) throws IOException { |
| byte[] buffer = new byte[] {(byte)169, (byte)85}; // 10101001 01010101 |
| InputStream ins = new ByteArrayInputStream(buffer); |
| ImageInputStream in = new FileCacheImageInputStream(ins,null); |
| |
| if (in.getBitOffset() != 0) { |
| throw new RuntimeException("Initial bit offset != 0!"); |
| } |
| |
| int bit0 = in.readBit(); // 1 |
| if (bit0 != 1) { |
| throw new RuntimeException("First bit != 1"); |
| } |
| if (in.getBitOffset() != 1) { |
| throw new RuntimeException("Second bit offset != 1"); |
| } |
| |
| long bits1 = in.readBits(5); // 01010 = 10 |
| if (bits1 != 10) { |
| throw new RuntimeException("Bits 1-5 != 10 (= " + bits1 + ")"); |
| } |
| if (in.getBitOffset() != 6) { |
| throw new RuntimeException("Third bit offset != 6"); |
| } |
| |
| int bit1 = in.readBit(); // 0 |
| if (bit1 != 0) { |
| throw new RuntimeException("Bit 6 != 0"); |
| } |
| if (in.getBitOffset() != 7) { |
| throw new RuntimeException("Third bit offset != 7"); |
| } |
| |
| long bits2 = in.readBits(8); // 10101010 = 170 |
| if (bits2 != 170) { |
| throw new RuntimeException("Bits 7-14 != 170 (= " + bits2 + ")"); |
| } |
| if (in.getBitOffset() != 7) { |
| throw new RuntimeException("Fourth bit offset != 7"); |
| } |
| |
| int bit2 = in.readBit(); // 1 |
| if (bit2 != 1) { |
| throw new RuntimeException("Bit 15 != 1"); |
| } |
| if (in.getBitOffset() != 0) { |
| throw new RuntimeException("Fifth bit offset != 0"); |
| } |
| |
| in.close(); |
| } |
| } |