1 /* 2 * Copyright (C) 2011 The Android Open Source Project 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.android.dx.util; 18 19 import com.android.dex.util.ByteArrayByteInput; 20 import com.android.dex.Leb128; 21 import java.io.IOException; 22 import java.util.Arrays; 23 import junit.framework.TestCase; 24 25 public final class Leb128UtilsTest extends TestCase { 26 27 public void testDecodeUnsignedLeb() throws IOException { 28 assertEquals(0, Leb128.readUnsignedLeb128(new ByteArrayByteInput((byte) 0))); 29 assertEquals(1, Leb128.readUnsignedLeb128(new ByteArrayByteInput((byte) 1))); 30 assertEquals(127, Leb128.readUnsignedLeb128(new ByteArrayByteInput((byte) 0x7f))); 31 assertEquals(16256, Leb128.readUnsignedLeb128( 32 new ByteArrayByteInput((byte) 0x80, (byte) 0x7f))); 33 } 34 35 public void testEncodeUnsignedLeb() throws IOException { 36 assertEquals(new byte[] { 0 }, encodeUnsignedLeb(0)); 37 assertEquals(new byte[] { 1 }, encodeUnsignedLeb(1)); 38 assertEquals(new byte[] { 0x7f }, encodeUnsignedLeb(127)); 39 assertEquals(new byte[] { (byte) 0x80, 0x7f }, encodeUnsignedLeb(16256)); 40 assertEquals(new byte[] { (byte) 0xb4, 0x07 }, encodeUnsignedLeb(0x3b4)); 41 assertEquals(new byte[] { (byte) 0x8c, 0x08 }, encodeUnsignedLeb(0x40c)); 42 assertEquals(new byte[] { (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, 0xf }, 43 encodeUnsignedLeb(0xffffffff)); 44 } 45 46 public void testDecodeSignedLeb() throws IOException { 47 assertEquals(0, Leb128.readSignedLeb128(new ByteArrayByteInput((byte) 0))); 48 assertEquals(1, Leb128.readSignedLeb128(new ByteArrayByteInput((byte) 1))); 49 assertEquals(-1, Leb128.readSignedLeb128(new ByteArrayByteInput((byte) 0x7f))); 50 assertEquals(0x3c, Leb128.readSignedLeb128(new ByteArrayByteInput((byte) 0x3c))); 51 assertEquals(-128, Leb128.readSignedLeb128( 52 new ByteArrayByteInput((byte) 0x80, (byte) 0x7f))); 53 } 54 55 public void testEncodeSignedLeb() throws IOException { 56 assertEquals(new byte[] { 0 }, encodeSignedLeb(0)); 57 assertEquals(new byte[] { 1 }, encodeSignedLeb(1)); 58 assertEquals(new byte[] { 0x7f }, encodeSignedLeb(-1)); 59 assertEquals(new byte[] { (byte) 0x80, 0x7f }, encodeSignedLeb(-128)); 60 } 61 62 private byte[] encodeSignedLeb(int value) { 63 ByteArrayAnnotatedOutput out = new ByteArrayAnnotatedOutput(5); 64 Leb128.writeSignedLeb128(out, value); 65 return out.toByteArray(); 66 } 67 68 private byte[] encodeUnsignedLeb(int value) { 69 ByteArrayAnnotatedOutput out = new ByteArrayAnnotatedOutput(5); 70 Leb128.writeUnsignedLeb128(out, value); 71 return out.toByteArray(); 72 } 73 74 private void assertEquals(byte[] expected, byte[] actual) { 75 assertTrue(Arrays.toString(actual), Arrays.equals(expected, actual)); 76 } 77 } 78
