|
Commons IO example source code file (EndianUtilsTest.java)
The Commons IO EndianUtilsTest.java source code/* * 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.commons.io; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.EOFException; import java.io.IOException; import junit.framework.TestCase; /** * @version $Revision: 1021989 $ $Date: 2010-10-13 04:51:27 +0100 (Wed, 13 Oct 2010) $ */ public class EndianUtilsTest extends TestCase { public EndianUtilsTest(String name) { super(name); } public void testCtor() throws IOException { new EndianUtils(); // Constructor does not blow up. } public void testEOFException() throws IOException { ByteArrayInputStream input = new ByteArrayInputStream(new byte[] {}); try { EndianUtils.readSwappedDouble(input); fail("Expected EOFException"); } catch (EOFException e) { // expected } } public void testSwapShort() { assertEquals( (short) 0, EndianUtils.swapShort( (short) 0 ) ); assertEquals( (short) 0x0201, EndianUtils.swapShort( (short) 0x0102 ) ); assertEquals( (short) 0xffff, EndianUtils.swapShort( (short) 0xffff ) ); assertEquals( (short) 0x0102, EndianUtils.swapShort( (short) 0x0201 ) ); } public void testSwapInteger() { assertEquals( 0, EndianUtils.swapInteger( 0 ) ); assertEquals( 0x04030201, EndianUtils.swapInteger( 0x01020304 ) ); assertEquals( 0x01000000, EndianUtils.swapInteger( 0x00000001 ) ); assertEquals( 0x00000001, EndianUtils.swapInteger( 0x01000000 ) ); assertEquals( 0x11111111, EndianUtils.swapInteger( 0x11111111 ) ); assertEquals( 0xabcdef10, EndianUtils.swapInteger( 0x10efcdab ) ); assertEquals( 0xab, EndianUtils.swapInteger( 0xab000000 ) ); } public void testSwapLong() { assertEquals( 0, EndianUtils.swapLong( 0 ) ); assertEquals( 0x0807060504030201L, EndianUtils.swapLong( 0x0102030405060708L ) ); assertEquals( 0xffffffffffffffffL, EndianUtils.swapLong( 0xffffffffffffffffL ) ); assertEquals( 0xab, EndianUtils.swapLong( 0xab00000000000000L ) ); } public void testSwapFloat() { assertEquals( 0.0f, EndianUtils.swapFloat( 0.0f ), 0.0 ); float f1 = Float.intBitsToFloat( 0x01020304 ); float f2 = Float.intBitsToFloat( 0x04030201 ); assertEquals( f2, EndianUtils.swapFloat( f1 ), 0.0 ); } public void testSwapDouble() { assertEquals( 0.0, EndianUtils.swapDouble( 0.0 ), 0.0 ); double d1 = Double.longBitsToDouble( 0x0102030405060708L ); double d2 = Double.longBitsToDouble( 0x0807060504030201L ); assertEquals( d2, EndianUtils.swapDouble( d1 ), 0.0 ); } /** * Tests all swapXxxx methods for symmetry when going from one endian * to another and back again. */ public void testSymmetry() { assertEquals( (short) 0x0102, EndianUtils.swapShort( EndianUtils.swapShort( (short) 0x0102 ) ) ); assertEquals( 0x01020304, EndianUtils.swapInteger( EndianUtils.swapInteger( 0x01020304 ) ) ); assertEquals( 0x0102030405060708L, EndianUtils.swapLong( EndianUtils.swapLong( 0x0102030405060708L ) ) ); float f1 = Float.intBitsToFloat( 0x01020304 ); assertEquals( f1, EndianUtils.swapFloat( EndianUtils.swapFloat( f1 ) ), 0.0 ); double d1 = Double.longBitsToDouble( 0x0102030405060708L ); assertEquals( d1, EndianUtils.swapDouble( EndianUtils.swapDouble( d1 ) ), 0.0 ); } public void testReadSwappedShort() throws IOException { byte[] bytes = new byte[] { 0x02, 0x01 }; assertEquals( 0x0102, EndianUtils.readSwappedShort( bytes, 0 ) ); ByteArrayInputStream input = new ByteArrayInputStream(bytes); assertEquals( 0x0102, EndianUtils.readSwappedShort( input ) ); } public void testWriteSwappedShort() throws IOException { byte[] bytes = new byte[2]; EndianUtils.writeSwappedShort( bytes, 0, (short) 0x0102 ); assertEquals( 0x02, bytes[0] ); assertEquals( 0x01, bytes[1] ); ByteArrayOutputStream baos = new ByteArrayOutputStream(2); EndianUtils.writeSwappedShort( baos, (short) 0x0102 ); bytes = baos.toByteArray(); assertEquals( 0x02, bytes[0] ); assertEquals( 0x01, bytes[1] ); } public void testReadSwappedUnsignedShort() throws IOException { byte[] bytes = new byte[] { 0x02, 0x01 }; assertEquals( 0x00000102, EndianUtils.readSwappedUnsignedShort( bytes, 0 ) ); ByteArrayInputStream input = new ByteArrayInputStream(bytes); assertEquals( 0x00000102, EndianUtils.readSwappedUnsignedShort( input ) ); } public void testReadSwappedInteger() throws IOException { byte[] bytes = new byte[] { 0x04, 0x03, 0x02, 0x01 }; assertEquals( 0x01020304, EndianUtils.readSwappedInteger( bytes, 0 ) ); ByteArrayInputStream input = new ByteArrayInputStream(bytes); assertEquals( 0x01020304, EndianUtils.readSwappedInteger( input ) ); } public void testWriteSwappedInteger() throws IOException { byte[] bytes = new byte[4]; EndianUtils.writeSwappedInteger( bytes, 0, 0x01020304 ); assertEquals( 0x04, bytes[0] ); assertEquals( 0x03, bytes[1] ); assertEquals( 0x02, bytes[2] ); assertEquals( 0x01, bytes[3] ); ByteArrayOutputStream baos = new ByteArrayOutputStream(4); EndianUtils.writeSwappedInteger( baos, 0x01020304 ); bytes = baos.toByteArray(); assertEquals( 0x04, bytes[0] ); assertEquals( 0x03, bytes[1] ); assertEquals( 0x02, bytes[2] ); assertEquals( 0x01, bytes[3] ); } public void testReadSwappedUnsignedInteger() throws IOException { byte[] bytes = new byte[] { 0x04, 0x03, 0x02, 0x01 }; assertEquals( 0x0000000001020304L, EndianUtils.readSwappedUnsignedInteger( bytes, 0 ) ); ByteArrayInputStream input = new ByteArrayInputStream(bytes); assertEquals( 0x0000000001020304L, EndianUtils.readSwappedUnsignedInteger( input ) ); } public void testReadSwappedLong() throws IOException { byte[] bytes = new byte[] { 0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01 }; assertEquals( 0x0102030405060708L, EndianUtils.readSwappedLong( bytes, 0 ) ); ByteArrayInputStream input = new ByteArrayInputStream(bytes); assertEquals( 0x0102030405060708L, EndianUtils.readSwappedLong( input ) ); } public void testWriteSwappedLong() throws IOException { byte[] bytes = new byte[8]; EndianUtils.writeSwappedLong( bytes, 0, 0x0102030405060708L ); assertEquals( 0x08, bytes[0] ); assertEquals( 0x07, bytes[1] ); assertEquals( 0x06, bytes[2] ); assertEquals( 0x05, bytes[3] ); assertEquals( 0x04, bytes[4] ); assertEquals( 0x03, bytes[5] ); assertEquals( 0x02, bytes[6] ); assertEquals( 0x01, bytes[7] ); ByteArrayOutputStream baos = new ByteArrayOutputStream(8); EndianUtils.writeSwappedLong( baos, 0x0102030405060708L ); bytes = baos.toByteArray(); assertEquals( 0x08, bytes[0] ); assertEquals( 0x07, bytes[1] ); assertEquals( 0x06, bytes[2] ); assertEquals( 0x05, bytes[3] ); assertEquals( 0x04, bytes[4] ); assertEquals( 0x03, bytes[5] ); assertEquals( 0x02, bytes[6] ); assertEquals( 0x01, bytes[7] ); } public void testReadSwappedFloat() throws IOException { byte[] bytes = new byte[] { 0x04, 0x03, 0x02, 0x01 }; float f1 = Float.intBitsToFloat( 0x01020304 ); float f2 = EndianUtils.readSwappedFloat( bytes, 0 ); assertEquals( f1, f2, 0.0 ); ByteArrayInputStream input = new ByteArrayInputStream(bytes); assertEquals( f1, EndianUtils.readSwappedFloat( input ), 0.0 ); } public void testWriteSwappedFloat() throws IOException { byte[] bytes = new byte[4]; float f1 = Float.intBitsToFloat( 0x01020304 ); EndianUtils.writeSwappedFloat( bytes, 0, f1 ); assertEquals( 0x04, bytes[0] ); assertEquals( 0x03, bytes[1] ); assertEquals( 0x02, bytes[2] ); assertEquals( 0x01, bytes[3] ); ByteArrayOutputStream baos = new ByteArrayOutputStream(4); EndianUtils.writeSwappedFloat( baos, f1 ); bytes = baos.toByteArray(); assertEquals( 0x04, bytes[0] ); assertEquals( 0x03, bytes[1] ); assertEquals( 0x02, bytes[2] ); assertEquals( 0x01, bytes[3] ); } public void testReadSwappedDouble() throws IOException { byte[] bytes = new byte[] { 0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01 }; double d1 = Double.longBitsToDouble( 0x0102030405060708L ); double d2 = EndianUtils.readSwappedDouble( bytes, 0 ); assertEquals( d1, d2, 0.0 ); ByteArrayInputStream input = new ByteArrayInputStream(bytes); assertEquals( d1, EndianUtils.readSwappedDouble( input ), 0.0 ); } public void testWriteSwappedDouble() throws IOException { byte[] bytes = new byte[8]; double d1 = Double.longBitsToDouble( 0x0102030405060708L ); EndianUtils.writeSwappedDouble( bytes, 0, d1 ); assertEquals( 0x08, bytes[0] ); assertEquals( 0x07, bytes[1] ); assertEquals( 0x06, bytes[2] ); assertEquals( 0x05, bytes[3] ); assertEquals( 0x04, bytes[4] ); assertEquals( 0x03, bytes[5] ); assertEquals( 0x02, bytes[6] ); assertEquals( 0x01, bytes[7] ); ByteArrayOutputStream baos = new ByteArrayOutputStream(8); EndianUtils.writeSwappedDouble( baos, d1 ); bytes = baos.toByteArray(); assertEquals( 0x08, bytes[0] ); assertEquals( 0x07, bytes[1] ); assertEquals( 0x06, bytes[2] ); assertEquals( 0x05, bytes[3] ); assertEquals( 0x04, bytes[4] ); assertEquals( 0x03, bytes[5] ); assertEquals( 0x02, bytes[6] ); assertEquals( 0x01, bytes[7] ); } // tests #IO-101 public void testSymmetryOfLong() { double[] tests = new double[] {34.345, -345.5645, 545.12, 10.043, 7.123456789123}; for (int i = 0; i< tests.length ;i++) { // testing the real problem byte[] buffer = new byte[8]; long ln1 = Double.doubleToLongBits( tests[i] ); EndianUtils.writeSwappedLong(buffer, 0, ln1); long ln2 = EndianUtils.readSwappedLong(buffer, 0); assertEquals( ln1, ln2 ); // testing the bug report buffer = new byte[8]; EndianUtils.writeSwappedDouble(buffer, 0, tests[i]); double val = EndianUtils.readSwappedDouble(buffer, 0); assertEquals( tests[i], val, 0 ); } } // tests #IO-117 public void testUnsignedOverrun() throws Exception { byte[] target = new byte[] { 0, 0, 0, (byte)0x80 }; long expected = 0x80000000L; long actual = EndianUtils.readSwappedUnsignedInteger(target, 0); assertEquals("readSwappedUnsignedInteger(byte[], int) was incorrect", expected, actual); ByteArrayInputStream in = new ByteArrayInputStream(target); actual = EndianUtils.readSwappedUnsignedInteger(in); assertEquals("readSwappedUnsignedInteger(InputStream) was incorrect", expected, actual); } } Other Commons IO examples (source code examples)Here is a short list of links related to this Commons IO EndianUtilsTest.java source code file: |
... this post is sponsored by my books ... | |
#1 New Release! |
FP Best Seller |
Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.