| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.io.compress; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| import org.junit.Test; |
| import static org.junit.Assert.*; |
| |
| public class TestBlockDecompressorStream { |
| |
| private byte[] buf; |
| private ByteArrayInputStream bytesIn; |
| private ByteArrayOutputStream bytesOut; |
| |
| @Test |
| public void testRead() throws IOException { |
| // compress empty stream |
| bytesOut = new ByteArrayOutputStream(); |
| BlockCompressorStream blockCompressorStream = |
| new BlockCompressorStream(bytesOut, |
| new FakeCompressor(), 1024, 0); |
| // close without any write |
| blockCompressorStream.close(); |
| |
| // check compressed output |
| buf = bytesOut.toByteArray(); |
| assertEquals("empty file compressed output size is not 4", 4, buf.length); |
| |
| // use compressed output as input for decompression |
| bytesIn = new ByteArrayInputStream(buf); |
| |
| // get decompression stream |
| BlockDecompressorStream blockDecompressorStream = |
| new BlockDecompressorStream(bytesIn, new FakeDecompressor(), 1024); |
| try { |
| assertEquals("return value is not -1", |
| -1 , blockDecompressorStream.read()); |
| } catch (IOException e) { |
| fail("unexpected IOException : " + e); |
| } |
| } |
| } |
| |
| /** |
| * A fake compressor |
| * Its input and output is the same. |
| */ |
| class FakeCompressor implements Compressor{ |
| |
| private boolean finish; |
| private boolean finished; |
| int nread; |
| int nwrite; |
| |
| byte [] userBuf; |
| int userBufOff; |
| int userBufLen; |
| |
| @Override |
| public int compress(byte[] b, int off, int len) throws IOException { |
| int n = Math.min(len, userBufLen); |
| if (userBuf != null && b != null) |
| System.arraycopy(userBuf, userBufOff, b, off, n); |
| userBufOff += n; |
| userBufLen -= n; |
| nwrite += n; |
| |
| if (finish && userBufLen <= 0) |
| finished = true; |
| |
| return n; |
| } |
| |
| @Override |
| public void end() { |
| // nop |
| } |
| |
| @Override |
| public void finish() { |
| finish = true; |
| } |
| |
| @Override |
| public boolean finished() { |
| return finished; |
| } |
| |
| @Override |
| public long getBytesRead() { |
| return nread; |
| } |
| |
| @Override |
| public long getBytesWritten() { |
| return nwrite; |
| } |
| |
| @Override |
| public boolean needsInput() { |
| return userBufLen <= 0; |
| } |
| |
| @Override |
| public void reset() { |
| finish = false; |
| finished = false; |
| nread = 0; |
| nwrite = 0; |
| userBuf = null; |
| userBufOff = 0; |
| userBufLen = 0; |
| } |
| |
| @Override |
| public void setDictionary(byte[] b, int off, int len) { |
| // nop |
| } |
| |
| @Override |
| public void setInput(byte[] b, int off, int len) { |
| nread += len; |
| userBuf = b; |
| userBufOff = off; |
| userBufLen = len; |
| } |
| |
| @Override |
| public void reinit(Configuration conf) { |
| // nop |
| } |
| |
| } |
| |
| /** |
| * A fake decompressor, just like FakeCompressor |
| * Its input and output is the same. |
| */ |
| class FakeDecompressor implements Decompressor { |
| |
| private boolean finish; |
| private boolean finished; |
| int nread; |
| int nwrite; |
| |
| byte [] userBuf; |
| int userBufOff; |
| int userBufLen; |
| |
| @Override |
| public int decompress(byte[] b, int off, int len) throws IOException { |
| int n = Math.min(len, userBufLen); |
| if (userBuf != null && b != null) |
| System.arraycopy(userBuf, userBufOff, b, off, n); |
| userBufOff += n; |
| userBufLen -= n; |
| nwrite += n; |
| |
| if (finish && userBufLen <= 0) |
| finished = true; |
| |
| return n; |
| } |
| |
| @Override |
| public void end() { |
| // nop |
| } |
| |
| @Override |
| public boolean finished() { |
| return finished; |
| } |
| |
| @Override |
| public boolean needsDictionary() { |
| return false; |
| } |
| |
| @Override |
| public boolean needsInput() { |
| return userBufLen <= 0; |
| } |
| |
| @Override |
| public void reset() { |
| finish = false; |
| finished = false; |
| nread = 0; |
| nwrite = 0; |
| userBuf = null; |
| userBufOff = 0; |
| userBufLen = 0; |
| } |
| |
| @Override |
| public void setDictionary(byte[] b, int off, int len) { |
| // nop |
| } |
| |
| @Override |
| public void setInput(byte[] b, int off, int len) { |
| nread += len; |
| userBuf = b; |
| userBufOff = off; |
| userBufLen = len; |
| } |
| |
| @Override |
| public int getRemaining() { |
| return 0; |
| } |
| |
| } |