91 lines
3.1 KiB
Java
91 lines
3.1 KiB
Java
/*
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* Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4416800
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* @summary Checks that ImageInputStreamImpl.readBit and readBits handle the bit
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* offset correctly
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*/
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import javax.imageio.stream.FileCacheImageInputStream;
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import javax.imageio.stream.ImageInputStream;
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public class ReadBitsTest {
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public static void main(String[] args) throws IOException {
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byte[] buffer = new byte[] {(byte)169, (byte)85}; // 10101001 01010101
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InputStream ins = new ByteArrayInputStream(buffer);
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ImageInputStream in = new FileCacheImageInputStream(ins,null);
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if (in.getBitOffset() != 0) {
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throw new RuntimeException("Initial bit offset != 0!");
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}
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int bit0 = in.readBit(); // 1
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if (bit0 != 1) {
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throw new RuntimeException("First bit != 1");
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}
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if (in.getBitOffset() != 1) {
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throw new RuntimeException("Second bit offset != 1");
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}
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long bits1 = in.readBits(5); // 01010 = 10
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if (bits1 != 10) {
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throw new RuntimeException("Bits 1-5 != 10 (= " + bits1 + ")");
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}
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if (in.getBitOffset() != 6) {
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throw new RuntimeException("Third bit offset != 6");
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}
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int bit1 = in.readBit(); // 0
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if (bit1 != 0) {
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throw new RuntimeException("Bit 6 != 0");
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}
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if (in.getBitOffset() != 7) {
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throw new RuntimeException("Third bit offset != 7");
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}
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long bits2 = in.readBits(8); // 10101010 = 170
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if (bits2 != 170) {
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throw new RuntimeException("Bits 7-14 != 170 (= " + bits2 + ")");
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}
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if (in.getBitOffset() != 7) {
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throw new RuntimeException("Fourth bit offset != 7");
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}
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int bit2 = in.readBit(); // 1
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if (bit2 != 1) {
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throw new RuntimeException("Bit 15 != 1");
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}
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if (in.getBitOffset() != 0) {
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throw new RuntimeException("Fifth bit offset != 0");
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}
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in.close();
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}
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}
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