1 /* 2 * Copyright (C) 2010 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.io; 18 19 import com.google.common.base.Charsets; 20 import com.google.common.primitives.Bytes; 21 import java.io.ByteArrayInputStream; 22 import java.io.ByteArrayOutputStream; 23 import java.io.DataInput; 24 import java.io.DataInputStream; 25 import java.io.IOException; 26 import junit.framework.TestCase; 27 28 /** 29 * Test class for {@link LittleEndianDataOutputStream}. 30 * 31 * @author Keith Bottner 32 */ 33 public class LittleEndianDataOutputStreamTest extends TestCase { 34 35 private ByteArrayOutputStream baos = new ByteArrayOutputStream(); 36 private LittleEndianDataOutputStream out = new LittleEndianDataOutputStream(baos); 37 testWriteLittleEndian()38 public void testWriteLittleEndian() throws IOException { 39 40 /* Write out various test values in LITTLE ENDIAN FORMAT */ 41 out.write(new byte[] {-100, 100}); 42 out.writeBoolean(true); 43 out.writeBoolean(false); 44 out.writeByte(100); 45 out.writeByte(-100); 46 out.writeByte((byte) 200); 47 out.writeChar('a'); 48 out.writeShort((short) -30000); 49 out.writeShort((short) 50000); 50 out.writeInt(0xCAFEBABE); 51 out.writeLong(0xDEADBEEFCAFEBABEL); 52 out.writeUTF("Herby Derby"); 53 out.writeFloat(Float.intBitsToFloat(0xCAFEBABE)); 54 out.writeDouble(Double.longBitsToDouble(0xDEADBEEFCAFEBABEL)); 55 56 byte[] data = baos.toByteArray(); 57 58 /* Setup input streams */ 59 DataInput in = new DataInputStream(new ByteArrayInputStream(data)); 60 61 /* Read in various values NORMALLY */ 62 byte[] b = new byte[2]; 63 in.readFully(b); 64 assertEquals(-100, b[0]); 65 assertEquals(100, b[1]); 66 assertEquals(true, in.readBoolean()); 67 assertEquals(false, in.readBoolean()); 68 assertEquals(100, in.readByte()); 69 assertEquals(-100, in.readByte()); 70 assertEquals(200, in.readUnsignedByte()); 71 assertEquals('\u6100', in.readChar()); 72 assertEquals(-12150, in.readShort()); 73 assertEquals(20675, in.readUnsignedShort()); 74 assertEquals(0xBEBAFECA, in.readInt()); 75 assertEquals(0xBEBAFECAEFBEADDEL, in.readLong()); 76 assertEquals("Herby Derby", in.readUTF()); 77 assertEquals(0xBEBAFECA, Float.floatToIntBits(in.readFloat())); 78 assertEquals(0xBEBAFECAEFBEADDEL, Double.doubleToLongBits(in.readDouble())); 79 } 80 81 @SuppressWarnings("deprecation") // testing a deprecated method testWriteBytes()82 public void testWriteBytes() throws IOException { 83 84 /* Write out various test values in LITTLE ENDIAN FORMAT */ 85 out.writeBytes("r\u00C9sum\u00C9"); 86 87 byte[] data = baos.toByteArray(); 88 89 /* Setup input streams */ 90 DataInput in = new DataInputStream(new ByteArrayInputStream(data)); 91 92 /* Read in various values NORMALLY */ 93 byte[] b = new byte[6]; 94 in.readFully(b); 95 assertEquals("r\u00C9sum\u00C9".getBytes(Charsets.ISO_8859_1), b); 96 } 97 98 @SuppressWarnings("deprecation") // testing a deprecated method testWriteBytes_discardHighOrderBytes()99 public void testWriteBytes_discardHighOrderBytes() throws IOException { 100 101 /* Write out various test values in LITTLE ENDIAN FORMAT */ 102 out.writeBytes("\uAAAA\uAABB\uAACC"); 103 104 byte[] data = baos.toByteArray(); 105 106 /* Setup input streams */ 107 DataInput in = new DataInputStream(new ByteArrayInputStream(data)); 108 109 /* Read in various values NORMALLY */ 110 byte[] b = new byte[3]; 111 in.readFully(b); 112 byte[] expected = {(byte) 0xAA, (byte) 0xBB, (byte) 0xCC}; 113 assertEquals(expected, b); 114 } 115 testWriteChars()116 public void testWriteChars() throws IOException { 117 118 /* Write out various test values in LITTLE ENDIAN FORMAT */ 119 out.writeChars("r\u00C9sum\u00C9"); 120 121 byte[] data = baos.toByteArray(); 122 123 /* Setup input streams */ 124 DataInput in = new DataInputStream(new ByteArrayInputStream(data)); 125 126 /* Read in various values NORMALLY */ 127 byte[] actual = new byte[12]; 128 in.readFully(actual); 129 assertEquals('r', actual[0]); 130 assertEquals(0, actual[1]); 131 assertEquals((byte) 0xC9, actual[2]); 132 assertEquals(0, actual[3]); 133 assertEquals('s', actual[4]); 134 assertEquals(0, actual[5]); 135 assertEquals('u', actual[6]); 136 assertEquals(0, actual[7]); 137 assertEquals('m', actual[8]); 138 assertEquals(0, actual[9]); 139 assertEquals((byte) 0xC9, actual[10]); 140 assertEquals(0, actual[11]); 141 } 142 assertEquals(byte[] expected, byte[] actual)143 private static void assertEquals(byte[] expected, byte[] actual) { 144 assertEquals(Bytes.asList(expected), Bytes.asList(actual)); 145 } 146 } 147