| /* |
| * 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.beam.sdk.util; |
| |
| import static org.hamcrest.Matchers.equalTo; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertThat; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.EOFException; |
| import java.io.IOException; |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.rules.ExpectedException; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Unit tests for {@link VarInt}. */ |
| @RunWith(JUnit4.class) |
| public class VarIntTest { |
| @Rule public final ExpectedException thrown = ExpectedException.none(); |
| |
| // Long values to check for boundary cases. |
| private static final long[] LONG_VALUES = { |
| 0, |
| 1, |
| 127, |
| 128, |
| 16383, |
| 16384, |
| 2097151, |
| 2097152, |
| 268435455, |
| 268435456, |
| 34359738367L, |
| 34359738368L, |
| 9223372036854775807L, |
| -9223372036854775808L, |
| -1, |
| }; |
| |
| // VarInt encoding of the above VALUES. |
| private static final byte[][] LONG_ENCODED = { |
| // 0 |
| {0x00}, |
| // 1 |
| {0x01}, |
| // 127 |
| {0x7f}, |
| // 128 |
| {(byte) 0x80, 0x01}, |
| // 16383 |
| {(byte) 0xff, 0x7f}, |
| // 16834 |
| {(byte) 0x80, (byte) 0x80, 0x01}, |
| // 2097151 |
| {(byte) 0xff, (byte) 0xff, 0x7f}, |
| // 2097152 |
| {(byte) 0x80, (byte) 0x80, (byte) 0x80, 0x01}, |
| // 268435455 |
| {(byte) 0xff, (byte) 0xff, (byte) 0xff, 0x7f}, |
| // 268435456 |
| {(byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80, 0x01}, |
| // 34359738367 |
| {(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, 0x7f}, |
| // 34359738368 |
| {(byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80, 0x01}, |
| // 9223372036854775807 |
| { |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0x7f |
| }, |
| // -9223372036854775808L |
| { |
| (byte) 0x80, |
| (byte) 0x80, |
| (byte) 0x80, |
| (byte) 0x80, |
| (byte) 0x80, |
| (byte) 0x80, |
| (byte) 0x80, |
| (byte) 0x80, |
| (byte) 0x80, |
| 0x01 |
| }, |
| // -1 |
| { |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| 0x01 |
| } |
| }; |
| |
| // Integer values to check for boundary cases. |
| private static final int[] INT_VALUES = { |
| 0, |
| 1, |
| 127, |
| 128, |
| 16383, |
| 16384, |
| 2097151, |
| 2097152, |
| 268435455, |
| 268435456, |
| 2147483647, |
| -2147483648, |
| -1, |
| }; |
| |
| // VarInt encoding of the above VALUES. |
| private static final byte[][] INT_ENCODED = { |
| // 0 |
| {(byte) 0x00}, |
| // 1 |
| {(byte) 0x01}, |
| // 127 |
| {(byte) 0x7f}, |
| // 128 |
| {(byte) 0x80, (byte) 0x01}, |
| // 16383 |
| {(byte) 0xff, (byte) 0x7f}, |
| // 16834 |
| {(byte) 0x80, (byte) 0x80, (byte) 0x01}, |
| // 2097151 |
| {(byte) 0xff, (byte) 0xff, (byte) 0x7f}, |
| // 2097152 |
| {(byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x01}, |
| // 268435455 |
| {(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0x7f}, |
| // 268435456 |
| {(byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x01}, |
| // 2147483647 |
| {(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0x07}, |
| // -2147483648 |
| {(byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x08}, |
| // -1 |
| {(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0x0f} |
| }; |
| |
| private static byte[] encodeInt(int v) throws IOException { |
| ByteArrayOutputStream stream = new ByteArrayOutputStream(); |
| VarInt.encode(v, stream); |
| return stream.toByteArray(); |
| } |
| |
| private static byte[] encodeLong(long v) throws IOException { |
| ByteArrayOutputStream stream = new ByteArrayOutputStream(); |
| VarInt.encode(v, stream); |
| return stream.toByteArray(); |
| } |
| |
| private static int decodeInt(byte[] encoded) throws IOException { |
| ByteArrayInputStream stream = new ByteArrayInputStream(encoded); |
| return VarInt.decodeInt(stream); |
| } |
| |
| private static long decodeLong(byte[] encoded) throws IOException { |
| ByteArrayInputStream stream = new ByteArrayInputStream(encoded); |
| return VarInt.decodeLong(stream); |
| } |
| |
| @Test |
| public void decodeValues() throws IOException { |
| assertEquals(LONG_VALUES.length, LONG_ENCODED.length); |
| for (int i = 0; i < LONG_ENCODED.length; ++i) { |
| ByteArrayInputStream stream = new ByteArrayInputStream(LONG_ENCODED[i]); |
| long parsed = VarInt.decodeLong(stream); |
| assertEquals(LONG_VALUES[i], parsed); |
| assertEquals(-1, stream.read()); |
| } |
| |
| assertEquals(INT_VALUES.length, INT_ENCODED.length); |
| for (int i = 0; i < INT_ENCODED.length; ++i) { |
| ByteArrayInputStream stream = new ByteArrayInputStream(INT_ENCODED[i]); |
| int parsed = VarInt.decodeInt(stream); |
| assertEquals(INT_VALUES[i], parsed); |
| assertEquals(-1, stream.read()); |
| } |
| } |
| |
| @Test |
| public void encodeValuesAndGetLength() throws IOException { |
| assertEquals(LONG_VALUES.length, LONG_ENCODED.length); |
| for (int i = 0; i < LONG_VALUES.length; ++i) { |
| byte[] encoded = encodeLong(LONG_VALUES[i]); |
| assertThat(encoded, equalTo(LONG_ENCODED[i])); |
| assertEquals(LONG_ENCODED[i].length, VarInt.getLength(LONG_VALUES[i])); |
| } |
| |
| assertEquals(INT_VALUES.length, INT_ENCODED.length); |
| for (int i = 0; i < INT_VALUES.length; ++i) { |
| byte[] encoded = encodeInt(INT_VALUES[i]); |
| assertThat(encoded, equalTo(INT_ENCODED[i])); |
| assertEquals(INT_ENCODED[i].length, VarInt.getLength(INT_VALUES[i])); |
| } |
| } |
| |
| @Test |
| public void decodeThrowsExceptionForOverflow() throws IOException { |
| final byte[] tooLargeNumber = { |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| (byte) 0xff, |
| 0x02 |
| }; |
| |
| thrown.expect(IOException.class); |
| decodeLong(tooLargeNumber); |
| } |
| |
| @Test |
| public void decodeThrowsExceptionForIntOverflow() throws IOException { |
| byte[] encoded = encodeLong(1L << 32); |
| |
| thrown.expect(IOException.class); |
| decodeInt(encoded); |
| } |
| |
| @Test |
| public void decodeThrowsExceptionForIntUnderflow() throws IOException { |
| byte[] encoded = encodeLong(-1); |
| |
| thrown.expect(IOException.class); |
| decodeInt(encoded); |
| } |
| |
| @Test |
| public void decodeThrowsExceptionForNonterminated() throws IOException { |
| final byte[] nonTerminatedNumber = {(byte) 0xff, (byte) 0xff}; |
| |
| thrown.expect(IOException.class); |
| decodeLong(nonTerminatedNumber); |
| } |
| |
| @Test |
| public void decodeParsesEncodedValues() throws IOException { |
| ByteArrayOutputStream outStream = new ByteArrayOutputStream(); |
| for (int i = 10; i < Integer.MAX_VALUE; i = (int) (i * 1.1)) { |
| VarInt.encode(i, outStream); |
| VarInt.encode(-i, outStream); |
| } |
| for (long i = 10; i < Long.MAX_VALUE; i = (long) (i * 1.1)) { |
| VarInt.encode(i, outStream); |
| VarInt.encode(-i, outStream); |
| } |
| |
| ByteArrayInputStream inStream = new ByteArrayInputStream(outStream.toByteArray()); |
| for (int i = 10; i < Integer.MAX_VALUE; i = (int) (i * 1.1)) { |
| assertEquals(i, VarInt.decodeInt(inStream)); |
| assertEquals(-i, VarInt.decodeInt(inStream)); |
| } |
| for (long i = 10; i < Long.MAX_VALUE; i = (long) (i * 1.1)) { |
| assertEquals(i, VarInt.decodeLong(inStream)); |
| assertEquals(-i, VarInt.decodeLong(inStream)); |
| } |
| } |
| |
| @Test |
| public void endOfFileThrowsException() throws Exception { |
| ByteArrayInputStream inStream = new ByteArrayInputStream(new byte[0]); |
| thrown.expect(EOFException.class); |
| VarInt.decodeInt(inStream); |
| } |
| |
| @Test |
| public void unterminatedThrowsException() throws Exception { |
| byte[] e = encodeLong(Long.MAX_VALUE); |
| byte[] s = new byte[1]; |
| s[0] = e[0]; |
| ByteArrayInputStream inStream = new ByteArrayInputStream(s); |
| thrown.expect(IOException.class); |
| VarInt.decodeInt(inStream); |
| } |
| } |