annotate src/org/eclipse/jetty/io/ByteArrayBuffer.java @ 1046:a8c92b0a08ed

add JBuffer
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 07 Nov 2016 22:39:39 -0700
parents dd71a59fcf72
children
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.io;
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20
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21 import java.io.IOException;
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22 import java.io.InputStream;
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23 import java.io.OutputStream;
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24 import java.io.UnsupportedEncodingException;
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25
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26 import org.eclipse.jetty.util.StringUtil;
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27
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28
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29 public class ByteArrayBuffer extends AbstractBuffer
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30 {
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31 // Set a maximum size to a write for the writeTo method, to ensure that very large content is not
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32 // written as a single write (which may fall foul to write timeouts if consumed slowly).
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33 final static int MAX_WRITE=Integer.getInteger("org.eclipse.jetty.io.ByteArrayBuffer.MAX_WRITE",128*1024);
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34 final protected byte[] _bytes;
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35
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36 protected ByteArrayBuffer(int size, int access)
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37 {
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38 this(new byte[size],0,0,access);
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39 }
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40
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41 public ByteArrayBuffer(byte[] bytes)
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42 {
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43 this(bytes, 0, bytes.length, READWRITE);
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44 }
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45
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46 public ByteArrayBuffer(byte[] bytes, int index, int length)
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47 {
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48 this(bytes, index, length, READWRITE);
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49 }
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50
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51 public ByteArrayBuffer(byte[] bytes, int index, int length, int access)
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52 {
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53 super(access);
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54 _bytes = bytes;
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55 setPutIndex(index + length);
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56 setGetIndex(index);
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57 }
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58
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59 public ByteArrayBuffer(int size)
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60 {
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61 this(new byte[size], 0, 0, READWRITE);
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62 setPutIndex(0);
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63 }
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64
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65 public ByteArrayBuffer(String value)
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66 {
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67 super(READONLY);
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68 _bytes = StringUtil.getBytes(value);
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69 setGetIndex(0);
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70 setPutIndex(_bytes.length);
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71 }
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72
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73 @Override
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74 public final byte[] array()
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75 {
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76 return _bytes;
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77 }
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78
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79 @Override
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80 public final int capacity()
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81 {
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82 return _bytes.length;
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83 }
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84
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85 @Override
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86 public final void compact()
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87 {
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88 if (isReadOnly())
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89 throw new IllegalStateException(__READONLY);
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90 int s = getIndex();
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91 if (s > 0)
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92 {
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93 int length = putIndex() - s;
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94 if (length > 0)
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95 {
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96 System.arraycopy(_bytes, s,_bytes, 0, length);
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97 }
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98 setGetIndex(getIndex() - s);
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99 setPutIndex(putIndex() - s);
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100 }
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101 }
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102
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103
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104 @Override
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105 public final boolean equals(Object obj)
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106 {
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107 if (obj==this)
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108 return true;
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109
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110 if (obj == null || !(obj instanceof Buffer))
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111 return false;
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112
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113
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114 Buffer b = (Buffer) obj;
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115
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116 // reject different lengths
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117 if (b.remaining() != remaining())
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118 return false;
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119
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120 // reject AbstractBuffer with different hash value
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121 if (_hash != 0 && obj instanceof AbstractBuffer)
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122 {
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123 AbstractBuffer ab = (AbstractBuffer) obj;
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124 if (ab._hash != 0 && _hash != ab._hash)
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125 return false;
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126 }
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127
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128 // Nothing for it but to do the hard grind.
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129 int get=getIndex();
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130 int bi=b.putIndex();
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131 for (int i = putIndex(); i-->get;)
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132 {
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133 byte b1 = _bytes[i];
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134 byte b2 = b.peek(--bi);
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135 if (b1 != b2) return false;
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136 }
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137 return true;
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138 }
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139
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140 @Override
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141 public final byte get()
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142 {
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143 return _bytes[_get++];
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144 }
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145
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146 @Override
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147 public final int hashCode()
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148 {
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149 if (_hash == 0 || _hashGet!=_get || _hashPut!=_put)
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150 {
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151 int get=getIndex();
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152 for (int i = putIndex(); i-- >get;)
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153 {
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154 byte b = _bytes[i];
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155 if ('a' <= b && b <= 'z')
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156 b = (byte) (b - 'a' + 'A');
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157 _hash = 31 * _hash + b;
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158 }
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159 if (_hash == 0)
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160 _hash = -1;
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161 _hashGet=_get;
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162 _hashPut=_put;
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163 }
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164 return _hash;
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165 }
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166
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167
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168 @Override
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169 public final byte peek(int index)
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170 {
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171 return _bytes[index];
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172 }
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173
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174 @Override
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175 public final int peek(int index, byte[] b, int offset, int length)
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176 {
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177 int l = length;
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178 if (index + l > capacity())
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179 {
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180 l = capacity() - index;
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181 if (l==0)
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182 return -1;
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183 }
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184
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185 if (l < 0)
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186 return -1;
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187
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188 System.arraycopy(_bytes, index, b, offset, l);
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189 return l;
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190 }
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191
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192 @Override
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193 public final void poke(int index, byte b)
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194 {
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195 /*
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196 if (isReadOnly())
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197 throw new IllegalStateException(__READONLY);
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198
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199 if (index < 0)
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200 throw new IllegalArgumentException("index<0: " + index + "<0");
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201 if (index > capacity())
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202 throw new IllegalArgumentException("index>capacity(): " + index + ">" + capacity());
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203 */
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204 _bytes[index] = b;
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205 }
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206
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207 @Override
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208 public final int poke(int index, Buffer src)
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209 {
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210 _hash=0;
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211
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212 /*
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213 if (isReadOnly())
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214 throw new IllegalStateException(__READONLY);
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215 if (index < 0)
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216 throw new IllegalArgumentException("index<0: " + index + "<0");
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217 */
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218
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219 int length=src.remaining();
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220 if (index + length > capacity())
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221 {
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222 length=capacity()-index;
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223 /*
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224 if (length<0)
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225 throw new IllegalArgumentException("index>capacity(): " + index + ">" + capacity());
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226 */
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227 }
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228
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229 byte[] src_array = src.array();
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230 if (src_array != null)
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231 System.arraycopy(src_array, src.getIndex(), _bytes, index, length);
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232 else
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233 {
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234 int s=src.getIndex();
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235 for (int i=0;i<length;i++)
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236 _bytes[index++]=src.peek(s++);
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237 }
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238
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239 return length;
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240 }
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241
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242
1010
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243 @Override
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244 public final int poke(int index, byte[] b, int offset, int length)
1010
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245 {
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246 _hash=0;
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247 /*
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248 if (isReadOnly())
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249 throw new IllegalStateException(__READONLY);
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250 if (index < 0)
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251 throw new IllegalArgumentException("index<0: " + index + "<0");
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252 */
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253
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254 if (index + length > capacity())
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255 {
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256 length=capacity()-index;
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257 /* if (length<0)
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258 throw new IllegalArgumentException("index>capacity(): " + index + ">" + capacity());
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259 */
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260 }
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261
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262 System.arraycopy(b, offset, _bytes, index, length);
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263
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264 return length;
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265 }
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266
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267 @Override
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268 public final int readFrom(InputStream in,int max) throws IOException
1010
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269 {
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270 if (max<0||max>space())
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271 max=space();
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272 int p = putIndex();
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273
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274 int len=0, total=0, available=max;
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275 while (total<max)
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276 {
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277 len=in.read(_bytes,p,available);
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278 if (len<0)
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279 break;
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280 else if (len>0)
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281 {
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282 p += len;
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283 total += len;
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284 available -= len;
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285 setPutIndex(p);
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286 }
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287 if (in.available()<=0)
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288 break;
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289 }
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290 if (len<0 && total==0)
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291 return -1;
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292 return total;
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293 }
802
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294
1010
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295 @Override
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296 public final int space()
1010
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297 {
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298 return _bytes.length - _put;
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299 }
802
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300
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301 }