| /* |
| * 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.iotdb.tsfile.encoding.bitpacking; |
| |
| import org.apache.iotdb.tsfile.utils.ReadWriteForEncodingUtils; |
| |
| import org.junit.Test; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Random; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| public class LongPackerTest { |
| |
| @Test |
| public void test() { |
| Random rand = new Random(); |
| int byteCount = 63; |
| |
| LongPacker packer = new LongPacker(byteCount); |
| ArrayList<Long> preValues = new ArrayList<>(); |
| int count = 1; |
| byte[] bb = new byte[count * byteCount]; |
| int idx = 0; |
| for (int i = 0; i < count; i++) { |
| long[] vs = new long[8]; |
| for (int j = 0; j < 8; j++) { |
| long v = rand.nextLong(); |
| vs[j] = v < 0 ? -v : v; |
| preValues.add(vs[j]); |
| } |
| |
| byte[] tb = new byte[byteCount]; |
| packer.pack8Values(vs, 0, tb); |
| for (int j = 0; j < tb.length; j++) { |
| bb[idx++] = tb[j]; |
| } |
| } |
| long[] tres = new long[count * 8]; |
| packer.unpackAllValues(bb, bb.length, tres); |
| |
| for (int i = 0; i < count * 8; i++) { |
| long v = preValues.get(i); |
| assertEquals(tres[i], v); |
| } |
| } |
| |
| @Test |
| public void testPackAll() throws IOException { |
| List<Long> bpList = new ArrayList<Long>(); |
| int bpCount = 15; |
| long bpStart = 11; |
| for (int i = 0; i < bpCount; i++) { |
| bpList.add(bpStart); |
| bpStart *= 3; |
| } |
| bpList.add(0L); |
| int bpBitWidth = ReadWriteForEncodingUtils.getLongMaxBitWidth(bpList); |
| |
| LongPacker packer = new LongPacker(bpBitWidth); |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| |
| long[] value1 = new long[8]; |
| long[] value2 = new long[8]; |
| for (int i = 0; i < 8; i++) { |
| value1[i] = bpList.get(i); |
| value2[i] = bpList.get(i + 8); |
| } |
| byte[] bytes1 = new byte[bpBitWidth]; |
| byte[] bytes2 = new byte[bpBitWidth]; |
| packer.pack8Values(value1, 0, bytes1); |
| baos.write(bytes1); |
| packer.pack8Values(value2, 0, bytes2); |
| baos.write(bytes2); |
| |
| long[] readArray = new long[16]; |
| byte[] bytes = new byte[2 * bpBitWidth]; |
| ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray()); |
| int bytesToRead = 2 * bpBitWidth; |
| bytesToRead = Math.min(bytesToRead, bais.available()); |
| new DataInputStream(bais).readFully(bytes, 0, bytesToRead); |
| |
| // save all long values in currentBuffer |
| packer.unpackAllValues(bytes, bytesToRead, readArray); |
| for (int i = 0; i < 16; i++) { |
| long v = bpList.get(i); |
| assertEquals(readArray[i], v); |
| } |
| } |
| |
| @Test |
| public void test2() { |
| for (int width = 4; width < 63; width++) { |
| long[] arr = new long[8]; |
| long[] res = new long[8]; |
| for (int i = 0; i < 8; i++) { |
| arr[i] = i; |
| } |
| LongPacker packer = new LongPacker(width); |
| byte[] buf = new byte[width]; |
| packer.pack8Values(arr, 0, buf); |
| packer.unpack8Values(buf, 0, res); |
| for (int i = 0; i < 8; i++) { |
| assertEquals(arr[i], res[i]); |
| } |
| } |
| } |
| } |