Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/InflaterDataAccess.java @ 158:b413b16d10a5
Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Wed, 09 Mar 2011 13:16:37 +0100 |
parents | d5268ca7715b |
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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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50 |
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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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70 |
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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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77 |
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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) { |
157
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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 } |