1 /* |
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package sun.io; |
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26 |
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27 import sun.nio.cs.ext.DoubleByte; |
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28 import static sun.nio.cs.CharsetMapping.*; |
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29 |
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30 public abstract class CharToByteDBCS_ASCII extends CharToByteConverter |
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31 { |
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32 |
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33 private char highHalfZoneCode; |
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34 private byte[] outputByte = new byte[2]; |
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35 |
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36 private DoubleByte.Encoder enc; |
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37 |
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38 public CharToByteDBCS_ASCII(DoubleByte.Encoder enc) { |
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39 super(); |
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40 this.enc = enc; |
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41 } |
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42 |
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43 int encodeChar(char c) { |
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44 return enc.encodeChar(c); |
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45 } |
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46 |
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47 /** |
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48 * flush out any residual data and reset the buffer state |
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49 */ |
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50 public int flush(byte [] output, int outStart, int outEnd) |
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51 throws MalformedInputException, ConversionBufferFullException |
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52 { |
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53 |
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54 if (highHalfZoneCode != 0) { |
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55 reset(); |
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56 badInputLength = 0; |
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57 throw new MalformedInputException(); |
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58 } |
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59 |
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60 reset(); |
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61 return 0; |
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62 } |
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63 |
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64 /** |
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65 * Character conversion |
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66 */ |
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67 public int convert(char[] input, int inOff, int inEnd, |
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68 byte[] output, int outOff, int outEnd) |
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69 throws UnknownCharacterException, MalformedInputException, |
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70 ConversionBufferFullException |
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71 { |
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72 char inputChar; |
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73 int inputSize; |
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74 |
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75 byteOff = outOff; |
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76 charOff = inOff; |
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77 |
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78 while(charOff < inEnd) { |
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79 int index; |
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80 int theBytes; |
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81 int spaceNeeded; |
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82 |
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83 if (highHalfZoneCode == 0) { |
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84 inputChar = input[charOff]; |
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85 inputSize = 1; |
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86 } else { |
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87 inputChar = highHalfZoneCode; |
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88 inputSize = 0; |
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89 highHalfZoneCode = 0; |
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90 } |
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91 |
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92 // Is this a high surrogate? |
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93 if (Character.isHighSurrogate(inputChar)) { |
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94 // Is this the last character of the input? |
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95 if (charOff + inputSize >= inEnd) { |
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96 highHalfZoneCode = inputChar; |
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97 charOff += inputSize; |
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98 break; |
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99 } |
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100 |
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101 // Is there a low surrogate following? |
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102 inputChar = input[charOff + inputSize]; |
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103 if (Character.isLowSurrogate(inputChar)) { |
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104 // We have a valid surrogate pair. Too bad we don't do |
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105 // surrogates. Is substitution enabled? |
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106 if (subMode) { |
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107 if (subBytes.length == 1) { |
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108 outputByte[0] = 0x00; |
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109 outputByte[1] = subBytes[0]; |
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110 } |
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111 else { |
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112 outputByte[0] = subBytes[0]; |
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113 outputByte[1] = subBytes[1]; |
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114 } |
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115 inputSize++; |
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116 } else { |
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117 badInputLength = 2; |
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118 throw new UnknownCharacterException(); |
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119 } |
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120 } else { |
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121 // We have a malformed surrogate pair |
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122 badInputLength = 1; |
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123 throw new MalformedInputException(); |
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124 } |
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125 } |
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126 // Is this an unaccompanied low surrogate? |
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127 else if (Character.isLowSurrogate(inputChar)) { |
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128 badInputLength = 1; |
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129 throw new MalformedInputException(); |
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130 } else { |
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131 |
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132 // We have a valid character, get the bytes for it |
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133 theBytes = encodeChar(inputChar); |
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134 if (theBytes == UNMAPPABLE_ENCODING) { |
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135 // if there was no mapping - look for substitution characters |
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136 if (subMode) { |
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137 if (subBytes.length == 1) { |
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138 outputByte[0] = 0x00; |
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139 outputByte[1] = subBytes[0]; |
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140 } else { |
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141 outputByte[0] = subBytes[0]; |
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142 outputByte[1] = subBytes[1]; |
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143 } |
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144 } else { |
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145 badInputLength = 1; |
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146 throw new UnknownCharacterException(); |
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147 } |
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148 } else { |
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149 outputByte[0] = (byte)(theBytes >>8); |
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150 outputByte[1] = (byte)theBytes; |
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151 } |
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152 } |
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153 if (outputByte[0] == 0x00) |
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154 spaceNeeded = 1; |
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155 else |
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156 spaceNeeded = 2; |
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157 |
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158 if (byteOff + spaceNeeded > outEnd) |
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159 throw new ConversionBufferFullException(); |
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160 |
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161 if (spaceNeeded == 1) |
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162 output[byteOff++] = outputByte[1]; |
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163 else { |
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164 output[byteOff++] = outputByte[0]; |
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165 output[byteOff++] = outputByte[1]; |
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166 } |
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167 |
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168 charOff += inputSize; |
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169 } |
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170 return byteOff - outOff; |
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171 } |
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172 |
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173 /** |
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174 * Resets converter to its initial state. |
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175 */ |
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176 public void reset() { |
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177 charOff = byteOff = 0; |
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178 highHalfZoneCode = 0; |
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179 } |
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180 |
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181 /** |
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182 * Returns the maximum number of bytes needed to convert a char. |
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183 */ |
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184 public int getMaxBytesPerChar() { |
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185 return 2; |
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186 } |
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187 |
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188 /** |
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189 * Returns true if the given character can be converted to the |
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190 * target character encoding. |
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191 */ |
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192 public boolean canConvert(char c) { |
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193 return encodeChar(c) != UNMAPPABLE_ENCODING; |
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194 } |
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195 } |
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