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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the examples of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include "bencodeparser.h" |
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43 |
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44 #include <QList> |
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45 #include <QMetaType> |
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46 |
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47 BencodeParser::BencodeParser() |
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48 { |
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49 } |
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50 |
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51 bool BencodeParser::parse(const QByteArray &content) |
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52 { |
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53 if (content.isEmpty()) { |
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54 errString = QString("No content"); |
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55 return false; |
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56 } |
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57 |
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58 this->content = content; |
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59 index = 0; |
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60 infoStart = 0; |
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61 infoLength = 0; |
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62 return getDictionary(&dictionaryValue); |
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63 } |
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64 |
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65 QString BencodeParser::errorString() const |
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66 { |
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67 return errString; |
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68 } |
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69 |
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70 QMap<QByteArray, QVariant> BencodeParser::dictionary() const |
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71 { |
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72 return dictionaryValue; |
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73 } |
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74 |
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75 QByteArray BencodeParser::infoSection() const |
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76 { |
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77 return content.mid(infoStart, infoLength); |
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78 } |
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79 |
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80 bool BencodeParser::getByteString(QByteArray *byteString) |
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81 { |
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82 const int contentSize = content.size(); |
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83 int size = -1; |
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84 do { |
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85 char c = content.at(index); |
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86 if (c < '0' || c > '9') { |
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87 if (size == -1) |
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88 return false; |
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89 if (c != ':') { |
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90 errString = QString("Unexpected character at pos %1: %2") |
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91 .arg(index).arg(c); |
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92 return false; |
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93 } |
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94 ++index; |
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95 break; |
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96 } |
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97 if (size == -1) |
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98 size = 0; |
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99 size *= 10; |
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100 size += c - '0'; |
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101 } while (++index < contentSize); |
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102 |
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103 if (byteString) |
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104 *byteString = content.mid(index, size); |
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105 index += size; |
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106 return true; |
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107 } |
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108 |
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109 bool BencodeParser::getInteger(qint64 *integer) |
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110 { |
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111 const int contentSize = content.size(); |
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112 if (content.at(index) != 'i') |
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113 return false; |
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114 |
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115 ++index; |
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116 qint64 num = -1; |
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117 bool negative = false; |
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118 |
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119 do { |
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120 char c = content.at(index); |
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121 if (c < '0' || c > '9') { |
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122 if (num == -1) { |
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123 if (c != '-' || negative) |
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124 return false; |
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125 negative = true; |
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126 continue; |
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127 } else { |
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128 if (c != 'e') { |
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129 errString = QString("Unexpected character at pos %1: %2") |
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130 .arg(index).arg(c); |
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131 return false; |
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132 } |
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133 ++index; |
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134 break; |
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135 } |
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136 } |
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137 if (num == -1) |
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138 num = 0; |
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139 num *= 10; |
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140 num += c - '0'; |
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141 } while (++index < contentSize); |
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142 |
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143 if (integer) |
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144 *integer = negative ? -num : num; |
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145 return true; |
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146 } |
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147 |
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148 bool BencodeParser::getList(QList<QVariant> *list) |
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149 { |
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150 const int contentSize = content.size(); |
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151 if (content.at(index) != 'l') |
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152 return false; |
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153 |
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154 QList<QVariant> tmp; |
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155 ++index; |
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156 |
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157 do { |
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158 if (content.at(index) == 'e') { |
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159 ++index; |
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160 break; |
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161 } |
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162 |
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163 qint64 number; |
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164 QByteArray byteString; |
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165 QList<QVariant> tmpList; |
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166 QMap<QByteArray, QVariant> dictionary; |
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167 |
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168 if (getInteger(&number)) |
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169 tmp << number; |
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170 else if (getByteString(&byteString)) |
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171 tmp << byteString; |
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172 else if (getList(&tmpList)) |
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173 tmp << tmpList; |
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174 else if (getDictionary(&dictionary)) |
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175 tmp << qVariantFromValue<QMap<QByteArray, QVariant> >(dictionary); |
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176 else { |
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177 errString = QString("error at index %1").arg(index); |
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178 return false; |
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179 } |
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180 } while (index < contentSize); |
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181 |
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182 if (list) |
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183 *list = tmp; |
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184 return true; |
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185 } |
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186 |
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187 bool BencodeParser::getDictionary(QMap<QByteArray, QVariant> *dictionary) |
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188 { |
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189 const int contentSize = content.size(); |
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190 if (content.at(index) != 'd') |
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191 return false; |
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192 |
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193 QMap<QByteArray, QVariant> tmp; |
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194 ++index; |
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195 |
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196 do { |
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197 if (content.at(index) == 'e') { |
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198 ++index; |
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199 break; |
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200 } |
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201 |
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202 QByteArray key; |
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203 if (!getByteString(&key)) |
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204 break; |
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205 |
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206 if (key == "info") |
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207 infoStart = index; |
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208 |
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209 qint64 number; |
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210 QByteArray byteString; |
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211 QList<QVariant> tmpList; |
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212 QMap<QByteArray, QVariant> dictionary; |
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213 |
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214 if (getInteger(&number)) |
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215 tmp.insert(key, number); |
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216 else if (getByteString(&byteString)) |
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217 tmp.insert(key, byteString); |
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218 else if (getList(&tmpList)) |
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219 tmp.insert(key, tmpList); |
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220 else if (getDictionary(&dictionary)) |
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221 tmp.insert(key, qVariantFromValue<QMap<QByteArray, QVariant> >(dictionary)); |
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222 else { |
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223 errString = QString("error at index %1").arg(index); |
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224 return false; |
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225 } |
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226 |
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227 if (key == "info") |
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228 infoLength = index - infoStart; |
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229 |
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230 } while (index < contentSize); |
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231 |
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232 if (dictionary) |
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233 *dictionary = tmp; |
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234 return true; |
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235 } |