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annotate src/org/tmatesoft/hg/internal/InflaterDataAccess.java @ 176:a8df7162ec75

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Extracting complete branch using remote between call to detect incoming changes is done. Arguments reorderd in remote repo to better match Hg server ideology, not my mental convenience
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 02 Apr 2011 03:01:14 +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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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 }