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1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 /* |
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18 * Licensed to the Apache Software Foundation (ASF) under one or more |
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19 * contributor license agreements. See the NOTICE file distributed with |
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20 * this work for additional information regarding copyright ownership. |
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21 * The ASF licenses this file to You under the Apache License, Version 2.0 |
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22 * (the "License"); you may not use this file except in compliance with |
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23 * the License. You may obtain a copy of the License at |
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24 * |
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25 * http://www.apache.org/licenses/LICENSE-2.0 |
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26 * |
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27 * Unless required by applicable law or agreed to in writing, software |
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28 * distributed under the License is distributed on an "AS IS" BASIS, |
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29 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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30 * See the License for the specific language governing permissions and |
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31 * limitations under the License. |
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32 */ |
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33 |
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34 /* |
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35 * $Id: XML256TableTranscoder.hpp 568078 2007-08-21 11:43:25Z amassari $ |
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36 */ |
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37 |
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38 |
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39 #ifndef XML256TABLETRANSCODER_HPP |
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40 #define XML256TABLETRANSCODER_HPP |
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41 |
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42 #include <xercesc/util/TransService.hpp> |
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43 |
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44 XERCES_CPP_NAMESPACE_BEGIN |
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45 |
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46 // |
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47 // This class implements the functionality of a common type of transcoder |
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48 // for an 8 bit, single byte encoding based on a set of 'to' and 'from' |
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49 // translation tables. Actual derived classes are trivial and just have to |
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50 // provide us with pointers to their tables and we do all the work. |
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51 // |
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52 class XMLUTIL_EXPORT XML256TableTranscoder : public XMLTranscoder |
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53 { |
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54 public : |
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55 // ----------------------------------------------------------------------- |
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56 // Public constructors and destructor |
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57 // ----------------------------------------------------------------------- |
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58 virtual ~XML256TableTranscoder(); |
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59 |
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60 |
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61 // ----------------------------------------------------------------------- |
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62 // The virtual transcoding interface |
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63 // ----------------------------------------------------------------------- |
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64 virtual unsigned int transcodeFrom |
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65 ( |
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66 const XMLByte* const srcData |
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67 , const unsigned int srcCount |
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68 , XMLCh* const toFill |
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69 , const unsigned int maxChars |
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70 , unsigned int& bytesEaten |
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71 , unsigned char* const charSizes |
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72 ); |
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73 |
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74 virtual unsigned int transcodeTo |
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75 ( |
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76 const XMLCh* const srcData |
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77 , const unsigned int srcCount |
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78 , XMLByte* const toFill |
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79 , const unsigned int maxBytes |
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80 , unsigned int& charsEaten |
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81 , const UnRepOpts options |
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82 ); |
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83 |
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84 virtual bool canTranscodeTo |
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85 ( |
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86 const unsigned int toCheck |
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87 ) const; |
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88 |
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89 |
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90 protected : |
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91 // ----------------------------------------------------------------------- |
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92 // Hidden constructors |
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93 // ----------------------------------------------------------------------- |
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94 XML256TableTranscoder |
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95 ( |
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96 const XMLCh* const encodingName |
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97 , const unsigned int blockSize |
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98 , const XMLCh* const fromTable |
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99 , const XMLTransService::TransRec* const toTable |
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100 , const unsigned int toTableSize |
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101 , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager |
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102 ); |
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103 |
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104 |
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105 // ----------------------------------------------------------------------- |
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106 // Protected helper methods |
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107 // ----------------------------------------------------------------------- |
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108 XMLByte xlatOneTo |
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109 ( |
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110 const XMLCh toXlat |
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111 ) const; |
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112 |
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113 |
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114 private : |
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115 // ----------------------------------------------------------------------- |
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116 // Unimplemented constructors and operators |
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117 // ----------------------------------------------------------------------- |
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118 XML256TableTranscoder(); |
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119 XML256TableTranscoder(const XML256TableTranscoder&); |
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120 XML256TableTranscoder& operator=(const XML256TableTranscoder&); |
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121 |
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122 |
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123 // ----------------------------------------------------------------------- |
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124 // Private data members |
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125 // |
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126 // fFromTable |
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127 // This is the 'from' table that we were given during construction. |
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128 // It is a 256 entry table of XMLCh chars. Each entry is the |
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129 // Unicode code point for the external encoding point of that value. |
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130 // So fFromTable[N] is the Unicode translation of code point N of |
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131 // the source encoding. |
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132 // |
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133 // We don't own this table, we just refer to it. It is assumed that |
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134 // the table is static, for performance reasons. |
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135 // |
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136 // fToSize |
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137 // The 'to' table is variable sized. This indicates how many records |
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138 // are in it. |
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139 // |
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140 // fToTable |
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141 // This is a variable sized table of TransRec structures. It must |
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142 // be sorted by the intCh field, i.e. the XMLCh field. It is searched |
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143 // binarily to find the record for a particular Unicode char. Then |
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144 // that record's extch field is the translation record. |
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145 // |
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146 // We don't own this table, we just refer to it. It is assumed that |
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147 // the table is static, for performance reasons. |
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148 // |
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149 // NOTE: There may be dups of the extCh field, since there might be |
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150 // multiple Unicode code points which map to the same external code |
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151 // point. Normally this won't happen, since the parser assumes that |
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152 // internalization is normalized, but we have to be prepared to do |
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153 // the right thing if some client code gives us non-normalized data |
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154 // itself. |
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155 // ----------------------------------------------------------------------- |
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156 const XMLCh* fFromTable; |
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157 unsigned int fToSize; |
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158 const XMLTransService::TransRec* fToTable; |
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159 }; |
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160 |
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161 XERCES_CPP_NAMESPACE_END |
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162 |
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163 #endif |