1 /* 2 * Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 4416800 27 * @summary Checks that ImageInputStreamImpl.readBit and readBits handle the bit 28 * offset correctly 29 */ 30 31 import java.io.ByteArrayInputStream; 32 import java.io.IOException; 33 import java.io.InputStream; 34 35 import javax.imageio.stream.FileCacheImageInputStream; 36 import javax.imageio.stream.ImageInputStream; 37 38 public class ReadBitsTest { 39 public static void main(String[] args) throws IOException { 40 byte[] buffer = new byte[] {(byte)169, (byte)85}; // 10101001 01010101 41 InputStream ins = new ByteArrayInputStream(buffer); 42 ImageInputStream in = new FileCacheImageInputStream(ins,null); 43 44 if (in.getBitOffset() != 0) { 45 throw new RuntimeException("Initial bit offset != 0!"); 46 } 47 48 int bit0 = in.readBit(); // 1 49 if (bit0 != 1) { 50 throw new RuntimeException("First bit != 1"); 51 } 52 if (in.getBitOffset() != 1) { 53 throw new RuntimeException("Second bit offset != 1"); 54 } 55 56 long bits1 = in.readBits(5); // 01010 = 10 57 if (bits1 != 10) { 58 throw new RuntimeException("Bits 1-5 != 10 (= " + bits1 + ")"); 59 } 60 if (in.getBitOffset() != 6) { 61 throw new RuntimeException("Third bit offset != 6"); 62 } 63 64 int bit1 = in.readBit(); // 0 65 if (bit1 != 0) { 66 throw new RuntimeException("Bit 6 != 0"); 67 } 68 if (in.getBitOffset() != 7) { 69 throw new RuntimeException("Third bit offset != 7"); 70 } 71 72 long bits2 = in.readBits(8); // 10101010 = 170 73 if (bits2 != 170) { 74 throw new RuntimeException("Bits 7-14 != 170 (= " + bits2 + ")"); 75 } 76 if (in.getBitOffset() != 7) { 77 throw new RuntimeException("Fourth bit offset != 7"); 78 } 79 80 int bit2 = in.readBit(); // 1 81 if (bit2 != 1) { 82 throw new RuntimeException("Bit 15 != 1"); 83 } 84 if (in.getBitOffset() != 0) { 85 throw new RuntimeException("Fifth bit offset != 0"); 86 } 87 88 in.close(); 89 } 90 }