Mercurial > hg > blitz_condensed
annotate src/com/go/trove/util/Deflater.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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1 /* ==================================================================== |
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2 * Trove - Copyright (c) 1997-2001 Walt Disney Internet Group |
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3 * ==================================================================== |
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4 * The Tea Software License, Version 1.1 |
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5 * |
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. |
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7 * |
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8 * Redistribution and use in source and binary forms, with or without |
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9 * modification, are permitted provided that the following conditions |
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10 * are met: |
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11 * |
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12 * 1. Redistributions of source code must retain the above copyright |
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13 * notice, this list of conditions and the following disclaimer. |
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14 * |
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15 * 2. Redistributions in binary form must reproduce the above copyright |
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16 * notice, this list of conditions and the following disclaimer in |
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17 * the documentation and/or other materials provided with the |
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18 * distribution. |
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19 * |
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20 * 3. The end-user documentation included with the redistribution, |
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21 * if any, must include the following acknowledgment: |
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22 * "This product includes software developed by the |
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23 * Walt Disney Internet Group (http://opensource.go.com/)." |
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24 * Alternately, this acknowledgment may appear in the software itself, |
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25 * if and wherever such third-party acknowledgments normally appear. |
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26 * |
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must |
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28 * not be used to endorse or promote products derived from this |
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29 * software without prior written permission. For written |
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30 * permission, please contact opensource@dig.com. |
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31 * |
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32 * 5. Products derived from this software may not be called "Tea", |
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", |
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior |
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35 * written permission of the Walt Disney Internet Group. |
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36 * |
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS |
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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48 * ==================================================================== |
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49 * |
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50 * For more information about Tea, please see http://opensource.go.com/. |
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51 */ |
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52 |
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53 package com.go.trove.util; |
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54 |
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55 /****************************************************************************** |
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56 * A zlib deflater interface that matches {@link java.util.zip.Deflater}, |
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57 * except additional flush operations are supported. This class requires native |
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58 * code support and looks for a library named "TroveZip". |
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59 * |
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60 * @author Brian S O'Neill |
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61 * @version |
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62 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/06/13 <!-- $--> |
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63 */ |
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64 public class Deflater { |
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65 public static final int |
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66 DEFLATED = 8, |
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67 NO_COMPRESSION = 0, |
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68 BEST_SPEED = 1, |
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69 BEST_COMPRESSION = 9, |
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70 DEFAULT_COMPRESSION = -1, |
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71 FILTERED = 1, |
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72 HUFFMAN_ONLY = 2, |
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73 DEFAULT_STRATEGY = 0; |
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74 |
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75 private static final int |
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76 NO_FLUSH = 0, |
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77 SYNC_FLUSH = 2, |
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78 FULL_FLUSH = 3, |
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79 FINISH = 4; |
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80 |
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81 static { |
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82 System.loadLibrary("TroveZip"); |
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83 initIDs(); |
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84 } |
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85 |
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86 // Pointer to strm used by native deflate functions. |
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87 private long mStream; |
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88 private boolean mNoWrap; |
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89 |
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90 private int mStrategy; |
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91 private int mLevel; |
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92 private boolean mSetParams; |
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93 |
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94 private int mFlushOption = NO_FLUSH; |
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95 private boolean mFinished; |
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96 |
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97 private byte[] mInputBuf; |
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98 private int mInputOffset; |
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99 private int mInputLength; |
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100 |
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101 public Deflater(int level, boolean nowrap) { |
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102 mStream = init(DEFAULT_STRATEGY, level, nowrap); |
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103 mStrategy = DEFAULT_STRATEGY; |
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104 mLevel = level; |
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105 mNoWrap = nowrap; |
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106 } |
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107 |
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108 public Deflater(int level) { |
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109 this(level, false); |
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110 } |
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111 |
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112 public Deflater() { |
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113 this(DEFAULT_COMPRESSION, false); |
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114 } |
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115 |
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116 public boolean isNoWrap() { |
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117 return mNoWrap; |
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118 } |
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119 |
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120 public synchronized void setInput(byte[] b, int off, int len) { |
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121 boundsCheck(b, off, len); |
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122 mInputLength = len; |
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123 mInputOffset = off; |
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124 mInputBuf = b; |
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125 } |
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126 |
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127 public synchronized void setInput(byte[] b) { |
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128 mInputLength = b.length; |
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129 mInputOffset = 0; |
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130 mInputBuf = b; |
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131 } |
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132 |
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133 public synchronized void setDictionary(byte[] b, int off, int len) { |
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134 boundsCheck(b, off, len); |
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135 setDictionary(mStream, b, off, len); |
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136 } |
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137 |
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138 public synchronized void setDictionary(byte[] b) { |
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139 setDictionary(mStream, b, 0, b.length); |
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140 } |
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141 |
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142 public synchronized void setStrategy(int strategy) { |
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143 mStrategy = strategy; |
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144 mSetParams = true; |
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145 } |
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146 |
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147 public synchronized void setLevel(int level) { |
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148 mLevel = level; |
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149 mSetParams = true; |
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150 } |
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151 |
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152 public boolean needsInput() { |
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153 return mInputLength <= 0; |
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154 } |
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155 |
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156 /** |
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157 * When called, indicates that the current input buffer contents should be |
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158 * flushed out when deflate is next called. |
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159 */ |
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160 public void flush() { |
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161 mFlushOption = SYNC_FLUSH; |
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162 } |
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163 |
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164 /** |
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165 * When called, indicates that the current input buffer contents should be |
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166 * flushed out when deflate is next called, but all compression information |
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167 * up to this point is cleared. |
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168 */ |
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169 public void fullFlush() { |
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170 mFlushOption = FULL_FLUSH; |
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171 } |
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172 |
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173 /** |
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174 * When called, indicates that compression should end with the current |
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175 * contents of the input buffer. Deflate must be called to get the final |
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176 * compressed bytes. |
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177 */ |
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178 public void finish() { |
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179 mFlushOption = FINISH; |
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180 } |
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181 |
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182 public synchronized boolean finished() { |
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183 return mFinished; |
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184 } |
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185 |
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186 public int deflate(byte[] b, int off, int len) { |
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187 boundsCheck(b, off, len); |
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188 return deflate0(b, off, len); |
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189 } |
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190 |
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191 public int deflate(byte[] b) { |
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192 return deflate0(b, 0, b.length); |
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193 } |
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194 |
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195 private synchronized int deflate0(byte[] b, int off, int len) { |
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196 int amt = deflate(mStream, mFlushOption, mSetParams, |
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197 mInputBuf, mInputOffset, mInputLength, |
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198 b, off, len); |
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199 if (amt < len) { |
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200 if (mFlushOption == SYNC_FLUSH || mFlushOption == FULL_FLUSH) { |
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201 mFlushOption = NO_FLUSH; |
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202 } |
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203 } |
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204 return amt; |
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205 } |
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206 |
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207 public synchronized int getAdler() { |
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208 return getAdler(mStream); |
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209 } |
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210 |
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211 public synchronized int getTotalIn() { |
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212 return getTotalIn(mStream); |
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213 } |
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214 |
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215 public synchronized int getTotalOut() { |
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216 return getTotalOut(mStream); |
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217 } |
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218 |
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219 private int mResetCount; |
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220 |
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221 public synchronized void reset() { |
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222 mFinished = false; |
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223 mFlushOption = NO_FLUSH; |
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224 mInputBuf = null; |
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225 mInputLength = 0; |
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226 reset(mStream); |
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227 } |
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228 |
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229 public synchronized void end() { |
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230 end(mStream); |
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231 } |
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232 |
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233 protected void finalize() { |
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234 end(); |
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235 } |
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236 |
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237 private void boundsCheck(byte[] b, int off, int len) { |
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238 if (off < 0 || len < 0 || off + len > b.length) { |
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239 throw new ArrayIndexOutOfBoundsException(); |
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240 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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241 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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242 |
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Dan Creswell <dan.creswell@gmail.com>
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243 private static native void initIDs(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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244 |
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245 private native long init(int strategy, int level, boolean nowrap); |
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246 |
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Dan Creswell <dan.creswell@gmail.com>
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247 private native void setDictionary(long strm, byte[] b, int off, int len); |
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248 |
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249 private native int deflate(long strm, int flushOpt, boolean setParams, |
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250 byte[] inBuf, int inOff, int inLen, |
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251 byte[] outBuf, int outOff, int outLen); |
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252 |
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Dan Creswell <dan.creswell@gmail.com>
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253 private native int getAdler(long strm); |
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254 private native int getTotalIn(long strm); |
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255 private native int getTotalOut(long strm); |
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256 private native void reset(long strm); |
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257 private native void end(long strm); |
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258 } |