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annotate test/org/tmatesoft/hg/test/TestInflaterDataAccess.java @ 655:bcbcc318f250

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Performance: reuse unzip output buffer
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 04 Jul 2013 18:36:38 +0200
parents 3c4db86e8c1f
children
rev   line source
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.test;
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18
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19 import java.io.ByteArrayOutputStream;
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20 import java.io.IOException;
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21 import java.nio.ByteBuffer;
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22 import java.util.zip.DeflaterOutputStream;
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23 import java.util.zip.Inflater;
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24
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25 import org.junit.Rule;
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26 import org.junit.Test;
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27 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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28 import org.tmatesoft.hg.internal.DataAccess;
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29 import org.tmatesoft.hg.internal.InflaterDataAccess;
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30
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31 /**
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32 *
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33 * @author Artem Tikhomirov
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34 * @author TMate Software Ltd.
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35 */
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36 public class TestInflaterDataAccess {
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37 @Rule
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38 public final ErrorCollectorExt errorCollector = new ErrorCollectorExt();
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39
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40 private final byte[] testContent1 = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.".getBytes();
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41
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42 private DataAccess zip(byte[] source) throws IOException {
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43 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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44 DeflaterOutputStream dos = new DeflaterOutputStream(bos);
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45 dos.write(source);
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46 dos.flush();
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47 dos.close();
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48 return new ByteArrayDataAccess(bos.toByteArray());
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49 }
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50
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51 @Test
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52 public void testSeek() throws Exception {
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53 DataAccess zip = zip(testContent1);
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54 InflaterDataAccess ida = new InflaterDataAccess(zip, 0, zip.length(), -1, new Inflater(), new byte[25], null);
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55 ida.seek(20);
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56 final int bufferCapacity = 10;
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57 ByteBuffer chunk1 = ByteBuffer.allocate(bufferCapacity);
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58 ida.readBytes(chunk1);
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59 errorCollector.assertTrue(new ByteArraySlice(testContent1, 20, bufferCapacity).equalsTo(chunk1.array()));
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60 ida.skip(-bufferCapacity);
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61 ByteBuffer chunk2 = ByteBuffer.allocate(bufferCapacity);
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62 ida.readBytes(chunk2);
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63 errorCollector.assertEquals(chunk1, chunk2);
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64 }
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65
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66 @Test
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67 public void testLength() throws Exception {
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68 DataAccess zip = zip(testContent1);
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69 InflaterDataAccess ida = new InflaterDataAccess(zip, 0, zip.length(), -1, new Inflater(), new byte[25], null);
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70 errorCollector.assertEquals("Plain #length()", testContent1.length, ida.length());
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71 //
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72 ida = new InflaterDataAccess(zip, 0, zip.length(), -1, new Inflater(), new byte[25], null);
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73 byte[] dummy = new byte[30];
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74 ida.readBytes(dummy, 0, dummy.length);
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75 errorCollector.assertEquals("#length() after readBytes()", testContent1.length, ida.length());
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76 //
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77 ida = new InflaterDataAccess(zip, 0, zip.length(), -1, new Inflater(), new byte[25], null);
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78 // consume most of the stream, so that all original compressed data is already read
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79 dummy = new byte[testContent1.length - 1];
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80 ida.readBytes(dummy, 0, dummy.length);
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81 errorCollector.assertEquals("#length() after origin was completely read", testContent1.length, ida.length());
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82 //
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83 errorCollector.assertFalse(ida.isEmpty()); // check InflaterDataAccess#available() positive
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84 }
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85
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86 @Test
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87 public void testReadBytes() throws Exception {
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88 DataAccess zip = zip(testContent1);
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89 InflaterDataAccess ida = new InflaterDataAccess(zip, 0, zip.length(), -1, new Inflater(), new byte[25], null);
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90 ida.skip(10);
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91 byte[] chunk1 = new byte[22];
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92 ida.readBytes(chunk1, 0, 20);
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93 chunk1[20] = ida.readByte();
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94 chunk1[21] = ida.readByte();
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95 ida.skip(5);
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96 byte[] chunk2 = new byte[12];
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97 chunk2[0] = ida.readByte();
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98 chunk2[1] = ida.readByte();
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99 ida.readBytes(chunk2, 2, 10);
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100 errorCollector.assertTrue(new ByteArraySlice(testContent1, 10, 22).equalsTo(chunk1));
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101 errorCollector.assertTrue(new ByteArraySlice(testContent1, 10+22+5, 12).equalsTo(chunk2));
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102 int consumed = 10+22+5+12;
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103 //
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104 // check that even when original content is completely unpacked, leftovers in the outBuffer are recognized
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105 ida.readBytes(ByteBuffer.allocate(testContent1.length - consumed - 2)); // unpack up to an end (almost)
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106 errorCollector.assertFalse(ida.isEmpty()); // check InflaterDataAccess#available() positive
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107 //
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108 ByteBuffer chunk3 = ByteBuffer.allocate(10);
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109 ida.readBytes(chunk3);
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110 errorCollector.assertEquals(2, chunk3.flip().remaining());
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111 }
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112
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113 private static class ByteArraySlice {
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114 public final byte[] array;
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115 public final int offset, length;
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116
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117 public ByteArraySlice(byte[] array, int offset, int length) {
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118 this.array = array;
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119 this.offset = offset;
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120 this.length = length;
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121 }
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122
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123 public boolean equalsTo(byte[] another) {
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124 if (another == null || another.length != length) {
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125 return false;
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126 }
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127 for (int i = 0; i < length; i++) {
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128 if (array[offset + i] != another[i]) {
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129 return false;
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130 }
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131 }
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132 return true;
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133 }
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134 }
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135 }