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1 /* |
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2 * Copyright 2002-2006 Sun Microsystems, Inc. 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. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any questions. |
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24 */ |
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25 |
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26 /* |
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27 */ |
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28 |
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29 package sun.nio.cs.ext; |
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30 |
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31 import java.nio.ByteBuffer; |
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32 import java.nio.CharBuffer; |
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33 import java.nio.charset.Charset; |
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34 import java.nio.charset.CharsetEncoder; |
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35 import java.nio.charset.CoderResult; |
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36 import sun.nio.cs.Surrogate; |
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37 |
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38 public abstract class DoubleByteEncoder |
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39 extends CharsetEncoder |
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40 { |
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41 |
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42 private short index1[]; |
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43 private String index2[]; |
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44 |
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45 private final Surrogate.Parser sgp = new Surrogate.Parser(); |
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46 |
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47 protected DoubleByteEncoder(Charset cs, |
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48 short[] index1, String[] index2) |
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49 { |
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50 super(cs, 2.0f, 2.0f); |
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51 this.index1 = index1; |
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52 this.index2 = index2; |
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53 } |
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54 |
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55 protected DoubleByteEncoder(Charset cs, |
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56 short[] index1, String[] index2, |
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57 float avg, float max) |
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58 { |
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59 super(cs, avg, max); |
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60 this.index1 = index1; |
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61 this.index2 = index2; |
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62 } |
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63 |
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64 protected DoubleByteEncoder(Charset cs, |
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65 short[] index1, String[] index2, byte[] repl) |
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66 { |
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67 super(cs, 2.0f, 2.0f, repl); |
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68 this.index1 = index1; |
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69 this.index2 = index2; |
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70 } |
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71 |
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72 |
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73 protected DoubleByteEncoder(Charset cs, |
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74 short[] index1, String[] index2, |
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75 byte[] repl, float avg, float max) |
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76 { |
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77 super(cs, avg, max,repl); |
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78 this.index1 = index1; |
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79 this.index2 = index2; |
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80 } |
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81 |
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82 public boolean canEncode(char c) { |
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83 return (encodeSingle(c) != -1 || |
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84 encodeDouble(c) != 0); |
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85 } |
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86 |
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87 private CoderResult encodeArrayLoop(CharBuffer src, ByteBuffer dst) { |
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88 char[] sa = src.array(); |
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89 int sp = src.arrayOffset() + src.position(); |
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90 int sl = src.arrayOffset() + src.limit(); |
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91 byte[] da = dst.array(); |
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92 int dp = dst.arrayOffset() + dst.position(); |
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93 int dl = dst.arrayOffset() + dst.limit(); |
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94 |
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95 try { |
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96 while (sp < sl) { |
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97 char c = sa[sp]; |
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98 if (Surrogate.is(c)) { |
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99 if (sgp.parse(c, sa, sp, sl) < 0) |
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100 return sgp.error(); |
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101 if (sl - sp < 2) |
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102 return CoderResult.UNDERFLOW; |
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103 char c2 = sa[sp + 1]; |
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104 |
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105 byte[] outputBytes = new byte[2]; |
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106 outputBytes = encodeSurrogate(c, c2); |
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107 |
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108 if (outputBytes == null) { |
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109 return sgp.unmappableResult(); |
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110 } |
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111 else { |
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112 if (dl - dp < 2) |
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113 return CoderResult.OVERFLOW; |
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114 da[dp++] = outputBytes[0]; |
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115 da[dp++] = outputBytes[1]; |
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116 sp += 2; |
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117 continue; |
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118 } |
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119 } |
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120 if (c >= '\uFFFE') |
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121 return CoderResult.unmappableForLength(1); |
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122 |
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123 int b = encodeSingle(c); |
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124 if (b != -1) { // Single Byte |
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125 if (dl - dp < 1) |
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126 return CoderResult.OVERFLOW; |
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127 da[dp++] = (byte)b; |
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128 sp++; |
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129 continue; |
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130 } |
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131 |
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132 int ncode = encodeDouble(c); |
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133 if (ncode != 0 && c != '\u0000' ) { |
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134 if (dl - dp < 2) |
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135 return CoderResult.OVERFLOW; |
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136 da[dp++] = (byte) ((ncode & 0xff00) >> 8); |
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137 da[dp++] = (byte) (ncode & 0xff); |
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138 sp++; |
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139 continue; |
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140 } |
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141 return CoderResult.unmappableForLength(1); |
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142 } |
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143 return CoderResult.UNDERFLOW; |
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144 } finally { |
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145 src.position(sp - src.arrayOffset()); |
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146 dst.position(dp - dst.arrayOffset()); |
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147 } |
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148 } |
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149 |
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150 private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) { |
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151 int mark = src.position(); |
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152 |
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153 try { |
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154 while (src.hasRemaining()) { |
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155 char c = src.get(); |
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156 if (Surrogate.is(c)) { |
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157 int surr; |
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158 if ((surr = sgp.parse(c, src)) < 0) |
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159 return sgp.error(); |
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160 char c2 = Surrogate.low(surr); |
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161 byte[] outputBytes = new byte[2]; |
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162 outputBytes = encodeSurrogate(c, c2); |
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163 |
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164 if (outputBytes == null) { |
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165 return sgp.unmappableResult(); |
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166 } else { |
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167 if (dst.remaining() < 2) |
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168 return CoderResult.OVERFLOW; |
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169 mark += 2; |
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170 dst.put(outputBytes[0]); |
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171 dst.put(outputBytes[1]); |
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172 continue; |
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173 } |
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174 } |
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175 if (c >= '\uFFFE') |
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176 return CoderResult.unmappableForLength(1); |
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177 int b = encodeSingle(c); |
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178 |
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179 if (b != -1) { // Single-byte character |
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180 if (dst.remaining() < 1) |
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181 return CoderResult.OVERFLOW; |
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182 mark++; |
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183 dst.put((byte)b); |
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184 continue; |
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185 } |
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186 // Double Byte character |
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187 |
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188 int ncode = encodeDouble(c); |
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189 if (ncode != 0 && c != '\u0000') { |
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190 if (dst.remaining() < 2) |
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191 return CoderResult.OVERFLOW; |
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192 mark++; |
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193 dst.put((byte) ((ncode & 0xff00) >> 8)); |
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194 dst.put((byte) ncode); |
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195 continue; |
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196 } |
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197 return CoderResult.unmappableForLength(1); |
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198 } |
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199 |
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200 return CoderResult.UNDERFLOW; |
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201 } finally { |
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202 src.position(mark); |
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203 } |
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204 } |
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205 |
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206 protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) { |
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207 if (true && src.hasArray() && dst.hasArray()) |
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208 return encodeArrayLoop(src, dst); |
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209 else |
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210 return encodeBufferLoop(src, dst); |
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211 } |
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212 |
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213 /* |
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214 * Can be changed by subclass |
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215 */ |
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216 protected int encodeDouble(char ch) { |
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217 int offset = index1[((ch & 0xff00) >> 8 )] << 8; |
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218 return index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff)); |
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219 } |
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220 |
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221 /* |
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222 * Can be changed by subclass |
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223 */ |
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224 protected int encodeSingle(char inputChar) { |
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225 if (inputChar < 0x80) |
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226 return (byte)inputChar; |
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227 else |
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228 return -1; |
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229 } |
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230 |
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231 /** |
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232 * Protected method which should be overridden by concrete DBCS |
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233 * CharsetEncoder classes which included supplementary characters |
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234 * within their mapping coverage. |
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235 * null return value indicates surrogate values could not be |
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236 * handled or encoded. |
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237 */ |
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238 protected byte[] encodeSurrogate(char highSurrogate, char lowSurrogate) { |
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239 return null; |
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240 } |
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241 } |