Mercurial > hg4j

annotate src/com/tmate/hgkit/fs/InflaterDataAccess.java @ 53:a6f39e595b2b wrap-data-access

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 16 Jan 2011 01:40:38 +0100
parents 9429c7bd1920
children
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51
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 /*
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2 * Copyright (c) 2011 Artem Tikhomirov
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3 */
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4 package com.tmate.hgkit.fs;
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5
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6 import java.io.EOFException;
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7 import java.io.IOException;
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8 import java.util.zip.DataFormatException;
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9 import java.util.zip.Inflater;
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10 import java.util.zip.ZipException;
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11
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12 /**
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13 * DataAccess counterpart for InflaterInputStream.
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14 * XXX is it really needed to be subclass of FilterDataAccess?
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15 * @author artem
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16 */
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17 public class InflaterDataAccess extends FilterDataAccess {
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18
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19 private final Inflater inflater;
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20 private final byte[] buffer;
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21 private final byte[] singleByte = new byte[1];
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22 private int decompressedPos = 0;
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23 private int decompressedLength = -1;
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24
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25 public InflaterDataAccess(DataAccess dataAccess, long offset, int length) {
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26 this(dataAccess, offset, length, new Inflater(), 512);
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27 }
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28
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29 public InflaterDataAccess(DataAccess dataAccess, long offset, int length, Inflater inflater, int bufSize) {
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30 super(dataAccess, offset, length);
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31 this.inflater = inflater;
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32 buffer = new byte[bufSize];
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33 }
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34
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35 @Override
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36 public void reset() throws IOException {
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37 super.reset();
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38 inflater.reset();
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39 decompressedPos = 0;
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40 }
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41
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42 @Override
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43 protected int available() {
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44 throw new IllegalStateException("Can't tell how much uncompressed data left");
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45 }
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46
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47 @Override
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48 public boolean isEmpty() {
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49 return super.available() <= 0 && inflater.finished(); // and/or inflater.getRemaining() <= 0 ?
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50 }
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51
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52 @Override
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53 public long length() {
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54 if (decompressedLength != -1) {
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55 return decompressedLength;
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56 }
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57 int c = 0;
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58 try {
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59 int oldPos = decompressedPos;
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60 while (!isEmpty()) {
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61 readByte();
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62 c++;
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63 }
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64 decompressedLength = c + oldPos;
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65 reset();
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66 seek(oldPos);
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67 return decompressedLength;
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68 } catch (IOException ex) {
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69 ex.printStackTrace(); // FIXME log error
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70 decompressedLength = -1; // better luck next time?
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71 return 0;
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72 }
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73 }
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74
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75 @Override
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76 public void seek(long localOffset) throws IOException {
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77 System.out.println("Seek: " + localOffset);
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78 if (localOffset < 0 /* || localOffset >= length() */) {
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79 throw new IllegalArgumentException();
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80 }
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81 if (localOffset >= decompressedPos) {
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82 skip((int) (localOffset - decompressedPos));
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83 } else {
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84 reset();
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85 skip((int) localOffset);
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86 }
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87 }
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88
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89 @Override
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90 public void skip(int bytes) throws IOException {
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91 if (bytes < 0) {
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92 bytes += decompressedPos;
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93 if (bytes < 0) {
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94 throw new IOException("Underflow. Rewind past start of the slice.");
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95 }
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96 reset();
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97 // fall-through
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98 }
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99 while (!isEmpty() && bytes > 0) {
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100 readByte();
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101 bytes--;
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102 }
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103 if (bytes != 0) {
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104 throw new IOException("Underflow. Rewind past end of the slice");
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105 }
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106 }
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107
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108 @Override
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109 public byte readByte() throws IOException {
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110 readBytes(singleByte, 0, 1);
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111 return singleByte[0];
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112 }
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113
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114 @Override
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115 public void readBytes(byte[] b, int off, int len) throws IOException {
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116 try {
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117 int n;
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118 while (len > 0) {
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119 while ((n = inflater.inflate(b, off, len)) == 0) {
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120 if (inflater.finished() || inflater.needsDictionary()) {
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121 throw new EOFException();
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122 }
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123 if (inflater.needsInput()) {
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124 // fill:
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125 int toRead = super.available();
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126 if (toRead > buffer.length) {
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127 toRead = buffer.length;
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128 }
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129 super.readBytes(buffer, 0, toRead);
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130 inflater.setInput(buffer, 0, toRead);
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131 }
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132 }
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133 off += n;
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134 len -= n;
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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135 decompressedPos += n;
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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136 if (len == 0) {
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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137 return; // filled
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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138 }
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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139 }
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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140 } catch (DataFormatException e) {
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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141 String s = e.getMessage();
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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142 throw new ZipException(s != null ? s : "Invalid ZLIB data format");
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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143 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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144 }
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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145 }