Mercurial > hg4j
annotate src/org/tmatesoft/hg/internal/NewlineFilter.java @ 113:67ae317408c9
Filter implementation for newline translation
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Wed, 02 Feb 2011 21:19:02 +0100 |
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children | 46291ec605a0 |
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 |
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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@svnkit.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 static org.tmatesoft.hg.internal.Filter.Direction.FromRepo; |
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20 import static org.tmatesoft.hg.internal.Filter.Direction.ToRepo; |
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21 import static org.tmatesoft.hg.internal.KeywordFilter.copySlice; |
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22 |
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23 import java.io.File; |
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24 import java.io.FileInputStream; |
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25 import java.io.FileOutputStream; |
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26 import java.nio.ByteBuffer; |
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27 |
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28 import org.tmatesoft.hg.core.Path; |
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29 import org.tmatesoft.hg.repo.HgRepository; |
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30 |
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31 /** |
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32 * |
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33 * @author Artem Tikhomirov |
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34 * @author TMate Software Ltd. |
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35 */ |
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36 public class NewlineFilter implements Filter { |
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37 |
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38 // if allowInconsistent is true, filter simply pass incorrect newline characters (single \r or \r\n on *nix and single \n on Windows) as is, |
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39 // i.e. doesn't try to convert them into appropriate newline characters. XXX revisit if Keyword extension behaves differently |
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40 private final boolean allowInconsistent; |
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41 private final boolean winToNix; |
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42 |
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43 private NewlineFilter(boolean failIfInconsistent, int transform) { |
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44 winToNix = transform == 0; |
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45 allowInconsistent = !failIfInconsistent; |
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46 } |
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47 |
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48 public ByteBuffer filter(ByteBuffer src) { |
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49 if (winToNix) { |
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50 return win2nix(src); |
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51 } else { |
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52 return nix2win(src); |
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53 } |
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54 } |
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55 |
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56 private ByteBuffer win2nix(ByteBuffer src) { |
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57 int x = src.position(); // source index |
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58 int lookupStart = x; |
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59 ByteBuffer dst = null; |
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60 while (x < src.limit()) { |
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61 // x, lookupStart, ir and in are absolute positions within src buffer, which is never read with modifying operations |
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62 int ir = indexOf('\r', src, lookupStart); |
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63 int in = indexOf('\n', src, lookupStart); |
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64 if (ir == -1) { |
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65 if (in == -1 || allowInconsistent) { |
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66 if (dst != null) { |
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67 copySlice(src, x, src.limit(), dst); |
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68 x = src.limit(); // consumed all |
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69 } |
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70 break; |
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71 } else { |
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72 fail(src, in); |
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73 } |
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74 } |
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75 // in == -1 while ir != -1 may be valid case if ir is the last char of the buffer, we check below for that |
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76 if (in != -1 && in != ir+1 && !allowInconsistent) { |
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77 fail(src, in); |
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78 } |
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79 if (dst == null) { |
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80 dst = ByteBuffer.allocate(src.remaining()); |
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81 } |
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82 copySlice(src, x, ir, dst); |
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83 if (ir+1 == src.limit()) { |
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84 // last char of the buffer - |
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85 // consume src till that char and let next iteration work on it |
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86 x = ir; |
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87 break; |
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88 } |
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89 if (in != ir + 1) { |
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90 x = ir+1; // generally in, but if allowInconsistent==true and \r is not followed by \n, then |
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91 // cases like "one \r two \r\n three" shall be processed correctly (second pair would be ignored if x==in) |
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92 lookupStart = ir+1; |
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93 } else { |
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94 x = in; |
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95 lookupStart = x+1; // skip \n for next lookup |
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96 } |
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97 } |
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98 src.position(x); // mark we've consumed up to x |
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99 return dst == null ? src : (ByteBuffer) dst.flip(); |
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100 } |
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101 |
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102 private ByteBuffer nix2win(ByteBuffer src) { |
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103 int x = src.position(); |
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104 ByteBuffer dst = null; |
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105 while (x < src.limit()) { |
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106 int in = indexOf('\n', src, x); |
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107 int ir = indexOf('\r', src, x, in == -1 ? src.limit() : in); |
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108 if (in == -1) { |
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109 if (ir == -1 || allowInconsistent) { |
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110 break; |
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111 } else { |
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112 fail(src, ir); |
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113 } |
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114 } else if (ir != -1 && !allowInconsistent) { |
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115 fail(src, ir); |
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116 } |
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117 |
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118 // x <= in < src.limit |
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119 // allowInconsistent && x <= ir < in || ir == -1 |
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120 if (dst == null) { |
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121 // buffer full of \n grows as much as twice in size |
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122 dst = ByteBuffer.allocate(src.remaining() * 2); |
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123 } |
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124 copySlice(src, x, in, dst); |
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125 if (ir == -1 || ir+1 != in) { |
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126 dst.put((byte) '\r'); |
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127 } // otherwise (ir!=-1 && ir+1==in) we found \r\n pair, don't convert to \r\r\n |
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128 // we may copy \n at src[in] on the next iteration, but would need extra lookupIndex variable then. |
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129 dst.put((byte) '\n'); |
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130 x = in+1; |
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131 } |
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132 src.position(x); |
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133 return dst == null ? src : (ByteBuffer) dst.flip(); |
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134 } |
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135 |
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136 |
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137 private void fail(ByteBuffer b, int pos) { |
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138 throw new RuntimeException(String.format("Inconsistent newline characters in the stream (char 0x%x, local index:%d)", b.get(pos), pos)); |
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139 } |
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140 |
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141 private static int indexOf(char ch, ByteBuffer b, int from) { |
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142 return indexOf(ch, b, from, b.limit()); |
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143 } |
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144 |
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145 // looks up in buf[from..to) |
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146 private static int indexOf(char ch, ByteBuffer b, int from, int to) { |
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147 for (int i = from; i < to; i++) { |
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148 byte c = b.get(i); |
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149 if (ch == c) { |
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150 return i; |
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151 } |
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152 } |
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153 return -1; |
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154 } |
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155 |
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156 public static class Factory implements Filter.Factory { |
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157 private final boolean localIsWin = File.separatorChar == '\\'; // FIXME |
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158 private final boolean failIfInconsistent = true; |
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159 |
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160 public Filter create(HgRepository hgRepo, Path path, Options opts) { |
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161 if (opts.getDirection() == FromRepo) { |
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162 } else if (opts.getDirection() == ToRepo) { |
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163 } |
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164 return new NewlineFilter(failIfInconsistent, 1); |
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165 } |
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166 } |
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167 |
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168 public static void main(String[] args) throws Exception { |
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169 FileInputStream fis = new FileInputStream(new File("/temp/design.lf.txt")); |
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170 FileOutputStream fos = new FileOutputStream(new File("/temp/design.newline.out")); |
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171 ByteBuffer b = ByteBuffer.allocate(12); |
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172 NewlineFilter nlFilter = new NewlineFilter(true, 1); |
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173 while (fis.getChannel().read(b) != -1) { |
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174 b.flip(); // get ready to be read |
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175 ByteBuffer f = nlFilter.filter(b); |
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176 fos.getChannel().write(f); // XXX in fact, f may not be fully consumed |
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177 if (b.hasRemaining()) { |
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178 b.compact(); |
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179 } else { |
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180 b.clear(); |
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181 } |
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182 } |
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183 fis.close(); |
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184 fos.flush(); |
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185 fos.close(); |
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186 } |
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187 |
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188 } |