Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/InflaterDataAccess.java @ 157:d5268ca7715b

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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
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 09 Mar 2011 05:22:17 +0100
parents src/com/tmate/hgkit/fs/InflaterDataAccess.java@9429c7bd1920
children b413b16d10a5
rev   line source
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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
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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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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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
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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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 /**
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27 * DataAccess counterpart for InflaterInputStream.
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28 * XXX is it really needed to be subclass of FilterDataAccess?
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
51
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32 */
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33 public class InflaterDataAccess extends FilterDataAccess {
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34
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35 private final Inflater inflater;
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36 private final byte[] buffer;
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37 private final byte[] singleByte = new byte[1];
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38 private int decompressedPos = 0;
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39 private int decompressedLength = -1;
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40
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41 public InflaterDataAccess(DataAccess dataAccess, long offset, int length) {
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42 this(dataAccess, offset, length, new Inflater(), 512);
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43 }
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44
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45 public InflaterDataAccess(DataAccess dataAccess, long offset, int length, Inflater inflater, int bufSize) {
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46 super(dataAccess, offset, length);
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47 this.inflater = inflater;
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48 buffer = new byte[bufSize];
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49 }
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50
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51 @Override
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52 public InflaterDataAccess reset() throws IOException {
51
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53 super.reset();
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54 inflater.reset();
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55 decompressedPos = 0;
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56 return this;
51
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57 }
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58
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59 @Override
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60 protected int available() {
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61 throw new IllegalStateException("Can't tell how much uncompressed data left");
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62 }
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63
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64 @Override
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65 public boolean isEmpty() {
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66 return super.available() <= 0 && inflater.finished(); // and/or inflater.getRemaining() <= 0 ?
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67 }
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68
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69 @Override
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70 public long length() {
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71 if (decompressedLength != -1) {
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72 return decompressedLength;
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73 }
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74 int c = 0;
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75 try {
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76 int oldPos = decompressedPos;
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77 while (!isEmpty()) {
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78 readByte();
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79 c++;
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80 }
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81 decompressedLength = c + oldPos;
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82 reset();
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83 seek(oldPos);
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84 return decompressedLength;
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85 } catch (IOException ex) {
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86 ex.printStackTrace(); // FIXME log error
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87 decompressedLength = -1; // better luck next time?
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88 return 0;
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89 }
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90 }
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91
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92 @Override
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93 public void seek(long localOffset) throws IOException {
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94 if (localOffset < 0 /* || localOffset >= length() */) {
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95 throw new IllegalArgumentException();
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96 }
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97 if (localOffset >= decompressedPos) {
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98 skip((int) (localOffset - decompressedPos));
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99 } else {
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100 reset();
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101 skip((int) localOffset);
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102 }
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103 }
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104
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105 @Override
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106 public void skip(int bytes) throws IOException {
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107 if (bytes < 0) {
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108 bytes += decompressedPos;
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109 if (bytes < 0) {
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110 throw new IOException("Underflow. Rewind past start of the slice.");
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111 }
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112 reset();
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113 // fall-through
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114 }
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115 while (!isEmpty() && bytes > 0) {
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116 readByte();
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117 bytes--;
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118 }
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119 if (bytes != 0) {
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120 throw new IOException("Underflow. Rewind past end of the slice");
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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 byte readByte() throws IOException {
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126 readBytes(singleByte, 0, 1);
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127 return singleByte[0];
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128 }
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129
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130 @Override
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131 public void readBytes(byte[] b, int off, int len) throws IOException {
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132 try {
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133 int n;
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134 while (len > 0) {
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135 while ((n = inflater.inflate(b, off, len)) == 0) {
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136 // FIXME few last bytes (checksum?) may be ignored by inflater, thus inflate may return 0 in
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137 // perfectly legal conditions (when all data already expanded, but there are still some bytes
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138 // in the input stream
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139 if (inflater.finished() || inflater.needsDictionary()) {
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140 throw new EOFException();
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141 }
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142 if (inflater.needsInput()) {
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143 // fill:
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144 int toRead = super.available();
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145 if (toRead > buffer.length) {
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146 toRead = buffer.length;
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147 }
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148 super.readBytes(buffer, 0, toRead);
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149 inflater.setInput(buffer, 0, toRead);
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150 }
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151 }
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152 off += n;
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153 len -= n;
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154 decompressedPos += n;
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155 if (len == 0) {
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156 return; // filled
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157 }
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158 }
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159 } catch (DataFormatException e) {
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160 String s = e.getMessage();
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161 throw new ZipException(s != null ? s : "Invalid ZLIB data format");
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162 }
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163 }
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164 }