1 | Namespace System
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2 | Namespace IO
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3 |
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4 | Class TextReader
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5 | Implements System.IDisposable
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6 | Public
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7 | Virtual Sub ~TextReader()
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8 | Dispose(False)
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9 | End Sub
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10 |
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11 | ' Static Null = StreamReader.Null As TextReader
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12 |
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13 | Public
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14 | Sub Close()
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15 | Dispose(True)
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16 | End Sub
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17 |
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18 | Sub Dispose()
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19 | Dispose(True)
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20 | End Sub
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21 |
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22 | Virtual Function Peek() As Long
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23 | If pos >= buf.Length Then
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24 | buf.Length = 0
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25 | pos = 0
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26 | Underflow()
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27 | If buf.Length = 0 Then
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28 | Peek = -1
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29 | Exit Function
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30 | End If
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31 | End If
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32 | Peek = buf[pos]
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33 | End Function
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34 |
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35 | Virtual Function Read() As Long
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36 | Read = Peek()
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37 | pos++
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38 | End Function
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39 | /*
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40 | @date 2008/02/26
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41 | @auther Egtra
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42 | */
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43 | Virtual Function Read(buffer As *Char, index As Long, count As Long) As Long
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44 | If buffer = 0 Then
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45 | Throw New ArgumentNullException("buffer")
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46 | ElseIf index < 0 Then
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47 | Throw New ArgumentOutOfRangeException("index")
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48 | ElseIf count < 0 Then
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49 | Throw New ArgumentOutOfRangeException("count")
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50 | End If
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51 | Read = ReadImpl(VarPtr(buffer[index]), count)
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52 | End Function
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53 |
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54 | Static Function Synchronized(reader As TextReader) As TextReader
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55 | Synchronized = New Detail.SynchronizedTextReader(reader)
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56 | End Function
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57 |
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58 | /*
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59 | @date 2008/02/26
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60 | @auther Egtra
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61 | @retval Nothing EOFに達しているとき
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62 | @retval 有効なStringインスタンス 読み取った1行
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63 | */
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64 | Virtual Function ReadLine() As String
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65 | If Peek() = -1 Then
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66 | Exit Function
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67 | End If
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68 | Dim sb = New Text.StringBuilder
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69 | Dim isLead = FALSE
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70 | Do
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71 | Dim ch = Read()
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72 | If ch = -1 Then Exit Do
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73 | If isLead = FALSE Then
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74 | If ch = &h0D Then
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75 | If Peek() = &h0A Then
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76 | Read() 'CR LFの場合
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77 | End If
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78 | Exit Do
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79 | End If
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80 | Select Case ch
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81 | Case -1 'EOF
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82 | Exit Do
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83 | Case &h0A 'LF
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84 | Exit Do
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85 | Case &h0B 'VT
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86 | Exit Do
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87 | Case &h0C 'FF
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88 | Exit Do
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89 | Case &h0D 'CR
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90 | Exit Do
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91 | #ifdef UNICODE
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92 | Case &h85 'NEL
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93 | Exit Do
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94 | Case &h2028 'LS
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95 | Exit Do
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96 | Case &h2029 'PS
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97 | Exit Do
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98 | #endif
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99 | End Select
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100 | End If
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101 | sb.Append(ch As Char)
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102 | #ifndef UNICODE
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103 | isLead = IsDBCSLeadByte(ch As Byte)
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104 | #endif
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105 | Loop
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106 | ReadLine = sb.ToString()
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107 | End Function
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108 |
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109 | /*!
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110 | @brief 現在位置からストリームの終わりまで読み込む。
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111 | @date 2008/02/26
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112 | @auther Egtra
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113 | */
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114 | Virtual Function ReadToEnd() As String
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115 | buf.Remove(0, pos)
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116 | While Underflow()
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117 | Wend
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118 | ReadToEnd = buf.ToString()
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119 | buf.Length = 0
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120 | pos = 0
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121 | End Function
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122 |
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123 | Protected
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124 | Sub TextReader()
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125 | buf = New Text.StringBuilder
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126 | pos = 0
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127 | End Sub
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128 |
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129 | Virtual Sub Dispose(disposing As Boolean)
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130 | End Sub
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131 |
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132 | /*!
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133 | @brief バッファが足りなくなったときに呼ばれる。
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134 | @date 2008/12/27
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135 | @auther Egtra
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136 | @retval True まだEOFに達していない場合
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137 | @retval False EOFに達した場合
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138 | */
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139 | Virtual Function Underflow() As Boolean
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140 | Underflow = False
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141 | End Function
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142 |
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143 | /*!
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144 | @brief 内部バッファを返す
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145 | @date 2008/12/27
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146 | @auther Egtra
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147 | @return 内部バッファ
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148 | 内部バッファの既存の要素は、一切の変更をしないこと。また、空であるという仮定を置かないこと。
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149 | */
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150 | Function Buffer() As Text.StringBuilder
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151 | Buffer = buf
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152 | End Function
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153 |
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154 | /*!
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155 | @date 2008/02/26
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156 | @auther Egtra
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157 | */
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158 | Function ReadImpl(buffer As *Char, count As Long) As Long
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159 | 'ToDo 適当なところでバッファの読み取り済みの部分を除去する処理を入れる(現在Peekのみ)。
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160 | Dim p = StrPtr(buf)
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161 | While buf.Length - pos < count
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162 | If Underflow() = False Then Exit While
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163 | Wend
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164 | ReadImpl = Math.Min(buf.Length - pos, count)
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165 | ActiveBasic.Strings.ChrCopy(buffer, VarPtr(p[pos]) As *Char, ReadImpl As SIZE_T)
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166 | pos += ReadImpl
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167 | End Function
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168 |
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169 | Private
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170 | buf As Text.StringBuilder
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171 | pos As Long
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172 | End Class
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173 |
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174 | Namespace Detail
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175 |
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176 | Class SynchronizedTextReader
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177 | Inherits TextReader
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178 | Public
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179 | Sub SynchronizedTextReader(reader As TextReader)
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180 | cs = New ActiveBasic.Windows.CriticalSection
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181 | base = reader
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182 | End Sub
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183 |
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184 | Override Function Peek() As Long
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185 | ' Using lock = cs.Lock()
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186 | Peek = base.Peek()
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187 | ' End Using
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188 | End Function
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189 |
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190 | Override Function Read() As Long
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191 | ' Using lock = cs.Lock()
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192 | Read = base.Read()
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193 | ' End Using
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194 | End Function
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195 |
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196 | Override Function Read(buffer As *Char, index As Long, count As Long) As Long
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197 | ' Using lock = cs.Lock()
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198 | Read = base.Read(buffer, index, count)
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199 | ' End Using
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200 | End Function
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201 |
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202 | Override Function ReadToEnd() As String
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203 | ' Using lock = cs.Lock
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204 | ReadToEnd = base.ReadToEnd
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205 | ' End Using
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206 | End Function
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207 |
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208 | Protected
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209 | Override Sub Dispose(disposing As Boolean)
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210 | Dim s = Nothing As Stream
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211 | SetPointer(VarPtr(s) As *VoidPtr, InterlockedExchangePointer(ByVal VarPtr(base) As *VoidPtr, 0))
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212 | If disposing Then
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213 | If Not ActiveBasic.IsNothing(s) Then
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214 | s.Dispose()
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215 | End If
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216 | cs.Dispose()
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217 | End If
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218 | End Sub
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219 |
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220 | Private
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221 | cs As ActiveBasic.Windows.CriticalSection
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222 | base As TextReader
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223 | End Class
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224 |
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225 | End Namespace
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226 |
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227 | End Namespace
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228 | End Namespace
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