| /* |
| * Copyright (c) 2002, 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 4507868 |
| * @summary Checks that ImageOutputStreamImpl.writeBits() advances the stream |
| * position and bit offset correctly. Also verifies that the |
| * MemoryCacheImageOutputStream.read() variants reset the bitOffset |
| * before the read actually occurs. |
| */ |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| |
| import javax.imageio.stream.ImageOutputStream; |
| import javax.imageio.stream.MemoryCacheImageOutputStream; |
| |
| public class WriteBitsTest { |
| |
| private static void verify(ImageOutputStream ios, |
| long expstreampos, int expbitoffset) |
| throws IOException, RuntimeException |
| { |
| long actstreampos = ios.getStreamPosition(); |
| int actbitoffset = ios.getBitOffset(); |
| |
| if ((actstreampos != expstreampos) || |
| (actbitoffset != expbitoffset)) |
| { |
| System.err.println("Expected stream position: " + expstreampos + |
| " Actual: " + actstreampos); |
| System.err.println("Expected bit offset: " + expbitoffset + |
| " Actual: " + actbitoffset); |
| throw new RuntimeException("Test failed."); |
| } |
| } |
| |
| public static void main(String argv[]) throws RuntimeException { |
| ByteArrayOutputStream ostream = new ByteArrayOutputStream(); |
| MemoryCacheImageOutputStream mcios = new |
| MemoryCacheImageOutputStream(ostream); |
| |
| try { |
| // verify correct writeBits() functionality |
| long streampos = 0; |
| int bitoffset = 0; |
| |
| mcios.setBitOffset(bitoffset); |
| verify(mcios, streampos, bitoffset); |
| |
| bitoffset = 3; |
| mcios.setBitOffset(bitoffset); |
| verify(mcios, streampos, bitoffset); |
| |
| for (int incr = 3; incr <= 15; incr += 12) { |
| for (int i = 0; i < 64; i += incr) { |
| mcios.writeBits(10, incr); |
| |
| bitoffset += incr; |
| |
| if (bitoffset > 7) { |
| int stroffset = bitoffset / 8; |
| bitoffset = bitoffset % 8; |
| streampos += stroffset; |
| } |
| |
| verify(mcios, streampos, bitoffset); |
| } |
| } |
| |
| // verify correct read(byte[], int, int) functionality |
| byte[] bytearr = new byte[2]; |
| mcios.seek(2); |
| mcios.setBitOffset(3); |
| int numread = mcios.read(bytearr, 0, 2); |
| if (numread != 2) { |
| throw new RuntimeException("Error in mcios.read([BII)I"); |
| } |
| verify(mcios, 4, 0); |
| |
| // verify correct read() functionality |
| mcios.setBitOffset(3); |
| mcios.read(); |
| verify(mcios, 5, 0); |
| } catch (IOException e) { |
| throw new RuntimeException("Unexpected IOException: " + e); |
| } |
| } |
| } |