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annotate src/org/tmatesoft/hg/internal/InflaterDataAccess.java @ 260:61cb6724ff36

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Experimental alternative to HashMap in Pool to reduce memory footprint
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 17 Aug 2011 02:35:15 +0200
parents b413b16d10a5
children 31f67be94e71
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1 /*
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2 * Copyright (c) 2011 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 import org.tmatesoft.hg.core.HgBadStateException;
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26
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27
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28 /**
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29 * DataAccess counterpart for InflaterInputStream.
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30 * XXX is it really needed to be subclass of FilterDataAccess?
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31 *
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public class InflaterDataAccess extends FilterDataAccess {
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36
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37 private final Inflater inflater;
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38 private final byte[] buffer;
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39 private final byte[] singleByte = new byte[1];
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40 private int decompressedPos = 0;
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41 private int decompressedLength;
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42
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43 public InflaterDataAccess(DataAccess dataAccess, int offset, int compressedLength) {
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44 this(dataAccess, offset, compressedLength, -1, new Inflater(), 512);
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45 }
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46
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47 public InflaterDataAccess(DataAccess dataAccess, int offset, int compressedLength, int actualLength) {
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48 this(dataAccess, offset, compressedLength, actualLength, new Inflater(), 512);
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49 }
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51 public InflaterDataAccess(DataAccess dataAccess, int offset, int compressedLength, int actualLength, Inflater inflater, int bufSize) {
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52 super(dataAccess, offset, compressedLength);
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53 this.inflater = inflater;
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54 this.decompressedLength = actualLength;
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55 buffer = new byte[bufSize];
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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() {
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68 return length() - decompressedPos;
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69 }
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71 @Override
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72 public boolean isEmpty() {
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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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78 @Override
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79 public int length() {
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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 try {
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86 int oldPos = decompressedPos;
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87 byte[] dummy = new byte[buffer.length];
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88 int toRead;
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89 while ((toRead = super.available()) > 0) {
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90 if (toRead > buffer.length) {
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91 toRead = buffer.length;
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92 }
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93 super.readBytes(buffer, 0, toRead);
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94 inflater.setInput(buffer, 0, toRead);
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95 try {
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96 while (!inflater.needsInput()) {
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97 c += inflater.inflate(dummy, 0, dummy.length);
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98 }
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99 } catch (DataFormatException ex) {
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100 throw new HgBadStateException(ex);
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101 }
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102 }
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103 decompressedLength = c + oldPos;
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104 reset();
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105 seek(oldPos);
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106 return decompressedLength;
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107 } catch (IOException ex) {
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108 decompressedLength = -1; // better luck next time?
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109 throw new HgBadStateException(ex); // XXX perhaps, checked exception
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110 }
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111 }
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112
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113 @Override
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114 public void seek(int localOffset) throws IOException {
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115 if (localOffset < 0 /* || localOffset >= length() */) {
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116 throw new IllegalArgumentException();
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117 }
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118 if (localOffset >= decompressedPos) {
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119 skip((int) (localOffset - decompressedPos));
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120 } else {
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121 reset();
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122 skip((int) localOffset);
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123 }
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124 }
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125
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126 @Override
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127 public void skip(int bytes) throws IOException {
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128 if (bytes < 0) {
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129 bytes += decompressedPos;
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130 if (bytes < 0) {
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131 throw new IOException("Underflow. Rewind past start of the slice.");
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132 }
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133 reset();
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134 // fall-through
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135 }
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136 while (!isEmpty() && bytes > 0) {
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137 readByte();
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138 bytes--;
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139 }
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140 if (bytes != 0) {
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141 throw new IOException("Underflow. Rewind past end of the slice");
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142 }
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143 }
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144
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145 @Override
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146 public byte readByte() throws IOException {
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147 readBytes(singleByte, 0, 1);
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148 return singleByte[0];
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149 }
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150
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151 @Override
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152 public void readBytes(byte[] b, int off, int len) throws IOException {
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153 try {
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154 int n;
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155 while (len > 0) {
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156 while ((n = inflater.inflate(b, off, len)) == 0) {
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157 // FIXME few last bytes (checksum?) may be ignored by inflater, thus inflate may return 0 in
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158 // perfectly legal conditions (when all data already expanded, but there are still some bytes
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159 // in the input stream
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160 if (inflater.finished() || inflater.needsDictionary()) {
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161 throw new EOFException();
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162 }
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163 if (inflater.needsInput()) {
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164 // fill:
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165 int toRead = super.available();
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166 if (toRead > buffer.length) {
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167 toRead = buffer.length;
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168 }
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169 super.readBytes(buffer, 0, toRead);
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170 inflater.setInput(buffer, 0, toRead);
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171 }
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172 }
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173 off += n;
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174 len -= n;
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175 decompressedPos += n;
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176 if (len == 0) {
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177 return; // filled
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178 }
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179 }
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180 } catch (DataFormatException e) {
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181 String s = e.getMessage();
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182 throw new ZipException(s != null ? s : "Invalid ZLIB data format");
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183 }
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184 }
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185 }