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1 /* |
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2 * Copyright 1997 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 package sun.io; |
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27 |
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28 /** |
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29 * A algorithmic conversion from ASCII to Unicode |
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30 * |
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31 * @author Limin Shi |
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32 */ |
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33 public class ByteToCharASCII extends ByteToCharConverter { |
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34 |
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35 // Return the character set id |
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36 public String getCharacterEncoding() |
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37 { |
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38 return "ASCII"; |
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39 } |
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40 |
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41 public int flush(char[] output, int outStart, int outEnd) { |
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42 // This converter will not buffer any data. |
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43 byteOff = charOff = 0; |
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44 return 0; |
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45 } |
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46 |
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47 /** |
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48 * Algorithmic character conversion |
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49 */ |
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50 public int convert(byte[] input, int inOff, int inEnd, |
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51 char[] output, int outOff, int outEnd) |
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52 throws ConversionBufferFullException, UnknownCharacterException |
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53 { |
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54 byte inputByte; |
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55 |
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56 charOff = outOff; |
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57 byteOff = inOff; |
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58 |
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59 // Loop until we hit the end of the input |
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60 while(byteOff < inEnd) |
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61 { |
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62 // If we don't have room for the output, throw an exception |
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63 if (charOff >= outEnd) |
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64 throw new ConversionBufferFullException(); |
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65 |
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66 // Convert the input byte |
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67 inputByte = input[byteOff++]; |
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68 |
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69 if (inputByte >= 0) |
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70 output[charOff++] = (char)inputByte; |
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71 else { |
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72 if (subMode) |
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73 output[charOff++] = '\uFFFD'; // Replace Char |
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74 else { |
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75 badInputLength = 1; |
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76 throw new UnknownCharacterException(); |
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77 } |
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78 } |
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79 } |
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80 |
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81 // Return the length written to the output buffer |
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82 return charOff-outOff; |
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83 } |
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84 |
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85 /* |
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86 * Reset after finding bad input |
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87 */ |
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88 public void reset() { |
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89 byteOff = charOff = 0; |
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90 } |
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91 |
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92 } |