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annotate src/org/tmatesoft/hg/internal/InflaterDataAccess.java @ 576:3c4db86e8c1f

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Issue 43: poor performance with InflaterDataAccess. Phase 2: inflate into buffer, effective skip and readByte/readBytes()
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Apr 2013 19:31:57 +0200
parents 8bf184c9d733
children ed243b668502
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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.internal;
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19 import java.io.IOException;
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20 import java.nio.ByteBuffer;
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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[] inBuffer;
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36 private final ByteBuffer outBuffer;
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37 private int inflaterPos = 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 inBuffer = buf;
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56 outBuffer = ByteBuffer.allocate(inBuffer.length * 2);
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57 outBuffer.limit(0); // there's nothing to read in the buffer
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58 }
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59
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60 @Override
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61 public InflaterDataAccess reset() throws IOException {
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62 super.reset();
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63 inflater.reset();
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64 inflaterPos = 0;
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65 outBuffer.clear().limit(0); // or flip(), to indicate nothing to read
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66 return this;
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67 }
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68
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69 @Override
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70 protected int available() throws IOException {
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71 return length() - decompressedPosition();
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72 }
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74 @Override
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75 public boolean isEmpty() throws IOException {
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76 // can't use super.available() <= 0 because even when 0 < super.count < 6(?)
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77 // decompressedPos might be already == length()
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78 return available() <= 0;
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79 }
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81 @Override
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82 public int length() throws IOException {
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83 if (decompressedLength != -1) {
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84 return decompressedLength;
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85 }
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86 decompressedLength = 0; // guard to avoid endless loop in case length() would get invoked from below.
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87 final int oldPos = decompressedPosition();
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88 final int inflatedUpTo = inflaterPos;
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89 int inflatedMore = 0, c;
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90 do {
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91 outBuffer.limit(outBuffer.position()); // pretend the buffer is consumed
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92 c = fillOutBuffer();
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93 inflatedMore += c;
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94 } while (c == outBuffer.capacity()); // once we unpacked less than capacity, input is over
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95 decompressedLength = inflatedUpTo + inflatedMore;
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96 reset();
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97 seek(oldPos);
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98 return decompressedLength;
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99 }
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101 @Override
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102 public void seek(int localOffset) throws IOException {
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103 if (localOffset < 0 /* || localOffset >= length() */) {
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104 throw new IllegalArgumentException();
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105 }
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106 int currentPos = decompressedPosition();
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107 if (localOffset >= currentPos) {
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108 skip(localOffset - currentPos);
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109 } else {
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110 reset();
420
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111 skip(localOffset);
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112 }
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113 }
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114
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115 @Override
391
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116 public void skip(final int bytesToSkip) throws IOException {
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117 int bytes = bytesToSkip;
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118 if (bytes < 0) {
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119 bytes += decompressedPosition();
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120 if (bytes < 0) {
576
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121 throw new IOException(String.format("Underflow. Rewind past start of the slice. To skip:%d, decPos:%d, decLen:%d. Left:%d", bytesToSkip, inflaterPos, decompressedLength, bytes));
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122 }
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123 reset();
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124 // fall-through
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125 }
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126 while (!isEmpty() && bytes > 0) {
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127 int fromBuffer = outBuffer.remaining();
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128 if (fromBuffer > 0) {
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129 if (fromBuffer >= bytes) {
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130 outBuffer.position(outBuffer.position() + bytes);
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131 bytes = 0;
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132 break;
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133 } else {
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134 bytes -= fromBuffer;
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135 outBuffer.limit(outBuffer.position()); // mark consumed
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136 // fall through to fill the buffer
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137 }
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138 }
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139 fillOutBuffer();
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140 }
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141 if (bytes != 0) {
576
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142 throw new IOException(String.format("Underflow. Rewind past end of the slice. To skip:%d, decPos:%d, decLen:%d. Left:%d", bytesToSkip, inflaterPos, decompressedLength, bytes));
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143 }
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144 }
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145
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146 @Override
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147 public byte readByte() throws IOException {
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148 if (!outBuffer.hasRemaining()) {
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149 fillOutBuffer();
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150 }
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151 return outBuffer.get();
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152 }
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153
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154 @Override
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155 public void readBytes(byte[] b, int off, int len) throws IOException {
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156 do {
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157 int fromBuffer = outBuffer.remaining();
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158 if (fromBuffer > 0) {
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159 if (fromBuffer >= len) {
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160 outBuffer.get(b, off, len);
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161 return;
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162 } else {
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163 outBuffer.get(b, off, fromBuffer);
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164 off += fromBuffer;
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165 len -= fromBuffer;
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166 // fall-through
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167 }
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168 }
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169 fillOutBuffer();
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170 } while (len > 0);
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171 }
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172
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173 @Override
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174 public void readBytes(ByteBuffer buf) throws IOException {
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175 int len = Math.min(available(), buf.remaining());
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176 while (len > 0) {
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177 if (outBuffer.remaining() >= len) {
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178 ByteBuffer slice = outBuffer.slice();
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179 slice.limit(len);
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180 buf.put(slice);
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181 outBuffer.position(outBuffer.position() + len);
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182 return;
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183 } else {
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184 len -= outBuffer.remaining();
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185 buf.put(outBuffer);
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186 }
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187 fillOutBuffer();
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188 }
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189 }
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190
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191 private int decompressedPosition() {
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192 assert outBuffer.remaining() <= inflaterPos;
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193 return inflaterPos - outBuffer.remaining();
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194 }
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195
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196 // after #fillOutBuffer(), outBuffer is ready for read
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197 private int fillOutBuffer() throws IOException {
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198 assert !outBuffer.hasRemaining();
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199 try {
576
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200 int inflatedBytes = 0;
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201 outBuffer.clear();
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202 int len = outBuffer.capacity();
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203 int off = 0;
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204 do {
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205 int n;
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206 while ((n = inflater.inflate(outBuffer.array(), off, len)) == 0) {
399
fdc1db8f7f61 Issue 25: Underflow in InflaterDataAccess; test and fix for hang up when reading past end of compressed data (or zero-length data)
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207 // XXX few last bytes (checksum?) may be ignored by inflater, thus inflate may return 0 in
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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208 // perfectly legal conditions (when all data already expanded, but there are still some bytes
399
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209 // in the input stream)
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210 int toRead = -1;
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211 if (inflater.needsInput() && (toRead = super.available()) > 0) {
576
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212 // fill
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213 if (toRead > inBuffer.length) {
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214 toRead = inBuffer.length;
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215 }
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216 super.readBytes(inBuffer, 0, toRead);
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217 inflater.setInput(inBuffer, 0, toRead);
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218 } else {
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219 // inflated nothing and doesn't want any more data (or no date available) - assume we're done
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220 assert inflater.finished();
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221 assert toRead <= 0;
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222 break;
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223 // prevent hang up in this cycle if no more data is available, see Issue 25
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224 // 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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225 }
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226 }
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227 off += n;
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228 len -= n;
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229 inflatedBytes += n;
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230 } while (len > 0 && !inflater.finished()); // either the buffer is filled or nothing more to unpack
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231 inflaterPos += inflatedBytes;
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232 outBuffer.limit(inflatedBytes);
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233 assert outBuffer.position() == 0; // didn't change since #clear() above
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234 return inflatedBytes;
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235 } catch (DataFormatException e) {
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236 String s = e.getMessage();
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237 throw new ZipException(s != null ? s : "Invalid ZLIB data format");
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238 }
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239 }
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240 }