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 22 import junit.framework.TestCase; 23 24 import java.io.ByteArrayInputStream; 25 import java.io.ByteArrayOutputStream; 26 import java.io.DataInput; 27 import java.io.DataInputStream; 28 import java.io.IOException; 29 30 /** 31 * Test class for {@link LittleEndianDataOutputStream}. 32 * 33 * @author Keith Bottner 34 */ 35 public class LittleEndianDataOutputStreamTest extends TestCase { 36 37 private ByteArrayOutputStream baos = new ByteArrayOutputStream(); 38 private LittleEndianDataOutputStream out = new LittleEndianDataOutputStream(baos); 39 40 public void testWriteLittleEndian() throws IOException { 41 42 /* Write out various test values in LITTLE ENDIAN FORMAT */ 43 out.write(new byte[] { -100, 100 }); 44 out.writeBoolean(true); 45 out.writeBoolean(false); 46 out.writeByte(100); 47 out.writeByte(-100); 48 out.writeByte((byte) 200); 49 out.writeChar('a'); 50 out.writeShort((short) -30000); 51 out.writeShort((short) 50000); 52 out.writeInt(0xCAFEBABE); 53 out.writeLong(0xDEADBEEFCAFEBABEL); 54 out.writeUTF("Herby Derby"); 55 out.writeFloat(Float.intBitsToFloat(0xCAFEBABE)); 56 out.writeDouble(Double.longBitsToDouble(0xDEADBEEFCAFEBABEL)); 57 58 byte[] data = baos.toByteArray(); 59 60 /* Setup input streams */ 61 DataInput in = new DataInputStream(new ByteArrayInputStream(data)); 62 63 /* Read in various values NORMALLY */ 64 byte[] b = new byte[2]; 65 in.readFully(b); 66 assertEquals(-100, b[0]); 67 assertEquals(100, b[1]); 68 assertEquals(true, in.readBoolean()); 69 assertEquals(false, in.readBoolean()); 70 assertEquals(100, in.readByte()); 71 assertEquals(-100, in.readByte()); 72 assertEquals(200, in.readUnsignedByte()); 73 assertEquals('\u6100', in.readChar()); 74 assertEquals(-12150, in.readShort()); 75 assertEquals(20675, in.readUnsignedShort()); 76 assertEquals(0xBEBAFECA, in.readInt()); 77 assertEquals(0xBEBAFECAEFBEADDEL, in.readLong()); 78 assertEquals("Herby Derby", in.readUTF()); 79 assertEquals(0xBEBAFECA, Float.floatToIntBits(in.readFloat())); 80 assertEquals(0xBEBAFECAEFBEADDEL, Double.doubleToLongBits(in.readDouble())); 81 } 82 83 @SuppressWarnings("deprecation") // testing a deprecated method 84 public void testWriteBytes() throws IOException { 85 86 /* Write out various test values in LITTLE ENDIAN FORMAT */ 87 out.writeBytes("r\u00C9sum\u00C9"); 88 89 byte[] data = baos.toByteArray(); 90 91 /* Setup input streams */ 92 DataInput in = new DataInputStream(new ByteArrayInputStream(data)); 93 94 /* Read in various values NORMALLY */ 95 byte[] b = new byte[6]; 96 in.readFully(b); 97 assertEquals("r\u00C9sum\u00C9".getBytes(Charsets.ISO_8859_1), b); 98 } 99 100 @SuppressWarnings("deprecation") // testing a deprecated method 101 public void testWriteBytes_discardHighOrderBytes() throws IOException { 102 103 /* Write out various test values in LITTLE ENDIAN FORMAT */ 104 out.writeBytes("\uAAAA\uAABB\uAACC"); 105 106 byte[] data = baos.toByteArray(); 107 108 /* Setup input streams */ 109 DataInput in = new DataInputStream(new ByteArrayInputStream(data)); 110 111 /* Read in various values NORMALLY */ 112 byte[] b = new byte[3]; 113 in.readFully(b); 114 byte[] expected = {(byte) 0xAA, (byte) 0xBB, (byte) 0xCC}; 115 assertEquals(expected, b); 116 } 117 118 public void testWriteChars() throws IOException { 119 120 /* Write out various test values in LITTLE ENDIAN FORMAT */ 121 out.writeChars("r\u00C9sum\u00C9"); 122 123 byte[] data = baos.toByteArray(); 124 125 /* Setup input streams */ 126 DataInput in = new DataInputStream(new ByteArrayInputStream(data)); 127 128 /* Read in various values NORMALLY */ 129 byte[] actual = new byte[12]; 130 in.readFully(actual); 131 assertEquals('r', actual[0]); 132 assertEquals(0, actual[1]); 133 assertEquals((byte) 0xC9, actual[2]); 134 assertEquals(0, actual[3]); 135 assertEquals('s', actual[4]); 136 assertEquals(0, actual[5]); 137 assertEquals('u', actual[6]); 138 assertEquals(0, actual[7]); 139 assertEquals('m', actual[8]); 140 assertEquals(0, actual[9]); 141 assertEquals((byte) 0xC9, actual[10]); 142 assertEquals(0, actual[11]); 143 } 144 145 private static void assertEquals(byte[] expected, byte[] actual) { 146 assertEquals(Bytes.asList(expected), Bytes.asList(actual)); 147 } 148 } 149
