| /* ==================================================================== |
| 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.poi.util; |
| |
| import static org.junit.jupiter.api.Assertions.assertArrayEquals; |
| import static org.junit.jupiter.api.Assertions.assertEquals; |
| import static org.junit.jupiter.api.Assertions.assertFalse; |
| import static org.junit.jupiter.api.Assertions.assertThrows; |
| import static org.junit.jupiter.api.Assertions.assertTrue; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| |
| import org.junit.jupiter.api.Test; |
| |
| /** |
| * Class to test {@link LittleEndianInputStream} and {@link LittleEndianOutputStream} |
| */ |
| final class TestLittleEndianStreams { |
| |
| @Test |
| void testRead() throws IOException { |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| try (LittleEndianOutputStream leo = new LittleEndianOutputStream(baos)) { |
| leo.writeInt(12345678); |
| leo.writeShort(12345); |
| leo.writeByte(123); |
| leo.writeShort(40000); |
| leo.writeByte(200); |
| leo.writeLong(1234567890123456789L); |
| leo.writeDouble(123.456); |
| } |
| |
| try (LittleEndianInputStream lei = new LittleEndianInputStream(new ByteArrayInputStream(baos.toByteArray()))) { |
| assertEquals(12345678, lei.readInt()); |
| assertEquals(12345, lei.readShort()); |
| assertEquals(123, lei.readByte()); |
| assertEquals(40000, lei.readUShort()); |
| assertEquals(200, lei.readUByte()); |
| assertEquals(1234567890123456789L, lei.readLong()); |
| assertEquals(123.456, lei.readDouble(), 0.0); |
| } |
| } |
| |
| /** |
| * Up until svn r836101 {@link LittleEndianByteArrayInputStream#readFully(byte[], int, int)} |
| * had an error which resulted in the data being read and written back to the source byte |
| * array. |
| */ |
| @Test |
| void testReadFully() { |
| byte[] srcBuf = HexRead.readFromString("99 88 77 66 55 44 33"); |
| LittleEndianInput lei = new LittleEndianByteArrayInputStream(srcBuf); |
| |
| // do initial read to increment the read index beyond zero |
| assertEquals(0x8899, lei.readUShort()); |
| |
| byte[] actBuf = new byte[4]; |
| lei.readFully(actBuf); |
| |
| assertFalse(actBuf[0] == 0x00 && srcBuf[0] == 0x77 && srcBuf[3] == 0x44, |
| "Identified bug in readFully() - source buffer was modified"); |
| |
| byte[] expBuf = HexRead.readFromString("77 66 55 44"); |
| assertArrayEquals(actBuf, expBuf); |
| assertEquals(0x33, lei.readUByte()); |
| assertEquals(0, lei.available()); |
| } |
| |
| @Test |
| void testBufferOverrun() { |
| byte[] srcBuf = HexRead.readFromString("99 88 77"); |
| LittleEndianInput lei = new LittleEndianByteArrayInputStream(srcBuf); |
| |
| // do initial read to increment the read index beyond zero |
| assertEquals(0x8899, lei.readUShort()); |
| |
| // only one byte left, so this should fail |
| RuntimeException ex = assertThrows(RuntimeException.class, () -> lei.readFully(new byte[4])); |
| assertTrue(ex.getMessage().contains("Buffer overrun")); |
| } |
| |
| @Test |
| void testBufferOverrunStartOffset() { |
| byte[] srcBuf = HexRead.readFromString("99 88 77 88 99"); |
| LittleEndianInput lei = new LittleEndianByteArrayInputStream(srcBuf, 2); |
| |
| // only one byte left, so this should fail |
| RuntimeException ex = assertThrows(RuntimeException.class, () -> lei.readFully(new byte[4])); |
| assertTrue(ex.getMessage().contains("Buffer overrun")); |
| } |
| |
| @Test |
| void testBufferOverrunStartOffset2() { |
| byte[] srcBuf = HexRead.readFromString("99 88 77 88 99"); |
| LittleEndianInput lei = new LittleEndianByteArrayInputStream(srcBuf, 2, 2); |
| |
| // only one byte left, so this should fail |
| RuntimeException ex = assertThrows(RuntimeException.class, () -> lei.readFully(new byte[4])); |
| assertTrue(ex.getMessage().contains("Buffer overrun")); |
| } |
| } |