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annotate src/org/tmatesoft/hg/internal/InflaterDataAccess.java @ 575:8bf184c9d733

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Issue 43: poor performance with InflaterDataAccess. Phase 1: test existing code, fix defects found
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Apr 2013 16:59:59 +0200
parents 2a08466838d3
children 3c4db86e8c1f
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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.internal;
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18
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19 import java.io.EOFException;
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20 import java.io.IOException;
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21 import java.util.zip.DataFormatException;
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22 import java.util.zip.Inflater;
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23 import java.util.zip.ZipException;
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24
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25 /**
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26 * DataAccess counterpart for InflaterInputStream.
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27 * XXX is it really needed to be subclass of FilterDataAccess?
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public class InflaterDataAccess extends FilterDataAccess {
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33
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34 private final Inflater inflater;
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35 private final byte[] buffer;
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36 private final byte[] singleByte = new byte[1];
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37 private int decompressedPos = 0;
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38 private int decompressedLength;
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39
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40 public InflaterDataAccess(DataAccess dataAccess, long offset, int compressedLength) {
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41 this(dataAccess, offset, compressedLength, -1, new Inflater(), new byte[512]);
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42 }
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43
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44 public InflaterDataAccess(DataAccess dataAccess, long offset, int compressedLength, int actualLength) {
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45 this(dataAccess, offset, compressedLength, actualLength, new Inflater(), new byte[512]);
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46 }
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47
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48 public InflaterDataAccess(DataAccess dataAccess, long offset, int compressedLength, int actualLength, Inflater inflater, byte[] buf) {
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49 super(dataAccess, offset, compressedLength);
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50 if (inflater == null || buf == null) {
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51 throw new IllegalArgumentException();
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52 }
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53 this.inflater = inflater;
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54 this.decompressedLength = actualLength;
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55 buffer = buf;
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56 }
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57
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58 @Override
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59 public InflaterDataAccess reset() throws IOException {
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60 super.reset();
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61 inflater.reset();
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62 decompressedPos = 0;
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63 return this;
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64 }
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65
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66 @Override
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67 protected int available() throws IOException {
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68 return length() - decompressedPos;
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69 }
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70
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71 @Override
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72 public boolean isEmpty() throws IOException {
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73 // can't use super.available() <= 0 because even when 0 < super.count < 6(?)
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74 // decompressedPos might be already == length()
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75 return available() <= 0;
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76 }
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77
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78 @Override
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79 public int length() throws IOException {
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80 if (decompressedLength != -1) {
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81 return decompressedLength;
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82 }
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83 decompressedLength = 0; // guard to avoid endless loop in case length() would get invoked from below.
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84 int c = 0;
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85 int oldPos = decompressedPos;
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86 byte[] dummy = new byte[buffer.length];
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87 try {
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88 int toRead = -1;
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89 do {
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90 while (!inflater.needsInput()) {
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91 c += inflater.inflate(dummy, 0, dummy.length);
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92 }
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93 if (inflater.needsInput() && (toRead = super.available()) > 0) {
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94 // fill:
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95 if (toRead > buffer.length) {
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96 toRead = buffer.length;
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97 }
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98 super.readBytes(buffer, 0, toRead);
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99 inflater.setInput(buffer, 0, toRead);
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100 }
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101 } while(toRead > 0);
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102 } catch (DataFormatException ex) {
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103 throw new IOException(ex.toString());
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104 }
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105 decompressedLength = c + oldPos;
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106 reset();
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107 seek(oldPos);
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108 return decompressedLength;
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109 }
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111 @Override
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112 public void seek(int localOffset) throws IOException {
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113 if (localOffset < 0 /* || localOffset >= length() */) {
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114 throw new IllegalArgumentException();
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115 }
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116 if (localOffset >= decompressedPos) {
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117 skip(localOffset - decompressedPos);
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118 } else {
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119 reset();
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120 skip(localOffset);
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121 }
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122 }
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123
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124 @Override
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125 public void skip(final int bytesToSkip) throws IOException {
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126 int bytes = bytesToSkip;
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127 if (bytes < 0) {
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128 bytes += decompressedPos;
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129 if (bytes < 0) {
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130 throw new IOException(String.format("Underflow. Rewind past start of the slice. To skip:%d, decPos:%d, decLen:%d. Left:%d", bytesToSkip, decompressedPos, decompressedLength, bytes));
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131 }
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132 reset();
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133 // fall-through
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134 }
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135 while (!isEmpty() && bytes > 0) {
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136 readByte();
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137 bytes--;
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138 }
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139 if (bytes != 0) {
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140 throw new IOException(String.format("Underflow. Rewind past end of the slice. To skip:%d, decPos:%d, decLen:%d. Left:%d", bytesToSkip, decompressedPos, decompressedLength, bytes));
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141 }
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142 }
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143
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144 @Override
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145 public byte readByte() throws IOException {
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146 readBytes(singleByte, 0, 1);
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147 return singleByte[0];
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148 }
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149
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150 @Override
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151 public void readBytes(byte[] b, int off, int len) throws IOException {
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152 try {
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153 int n;
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154 while (len > 0) {
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155 while ((n = inflater.inflate(b, off, len)) == 0) {
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156 // XXX few last bytes (checksum?) may be ignored by inflater, thus inflate may return 0 in
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157 // perfectly legal conditions (when all data already expanded, but there are still some bytes
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158 // in the input stream)
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159 int toRead = -1;
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160 if (inflater.needsInput() && (toRead = super.available()) > 0) {
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161 // fill:
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162 if (toRead > buffer.length) {
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163 toRead = buffer.length;
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164 }
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165 super.readBytes(buffer, 0, toRead);
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166 inflater.setInput(buffer, 0, toRead);
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167 } else {
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168 // prevent hang up in this cycle if no more data is available, see Issue 25
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169 throw new EOFException(String.format("No more compressed data is available to satisfy request for %d bytes. [finished:%b, needDict:%b, needInp:%b, available:%d", len, inflater.finished(), inflater.needsDictionary(), inflater.needsInput(), toRead));
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170 }
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171 }
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172 off += n;
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173 len -= n;
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174 decompressedPos += n;
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175 if (len == 0) {
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176 return; // filled
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177 }
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178 }
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179 } catch (DataFormatException e) {
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180 String s = e.getMessage();
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181 throw new ZipException(s != null ? s : "Invalid ZLIB data format");
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182 }
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183 }
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184 }