Mercurial > hg > blitz_stable

annotate src/com/go/trove/util/Deflater.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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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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241 }
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242
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243 private static native void initIDs();
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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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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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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 }