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- /* ====================================================================
- 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.IOException;
-
- import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
- import org.junit.jupiter.api.Test;
-
- /**
- * Class to test {@link LittleEndianInputStream} and {@link LittleEndianOutputStream}
- */
- final class TestLittleEndianStreams {
-
- @Test
- void testRead() throws IOException {
- UnsynchronizedByteArrayOutputStream baos = new UnsynchronizedByteArrayOutputStream();
- 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(baos.toInputStream())) {
- 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"));
- }
- }
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