[432] | 1 | 'Classes/System/IO/StreamReader.ab
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| 2 |
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[271] | 3 | Namespace System
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| 4 | Namespace IO
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| 5 |
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[432] | 6 | /*
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| 7 | @brief ストリームから読み取りを行うTextReaderの実装。
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| 8 | @date 2008/02/25
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| 9 | @auther Egtra
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| 10 | */
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[426] | 11 | Class StreamReader
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| 12 | Inherits TextReader
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| 13 | Public
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[432] | 14 | /*
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| 15 | @date 2008/02/25
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| 16 | @auther Egtra
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| 17 | */
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[426] | 18 | Sub StreamReader(path As String)
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| 19 | init(New FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
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| 20 | End Sub
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[271] | 21 |
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[432] | 22 | /*
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| 23 | @date 2008/02/25
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| 24 | @auther Egtra
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| 25 | */
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[426] | 26 | Sub StreamReader(stream As Stream)
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| 27 | init(stream)
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| 28 | End Sub
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| 29 |
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[432] | 30 | /*
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| 31 | @date 2008/02/25
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| 32 | @auther Egtra
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| 33 | */
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[426] | 34 | Override Function Peek() As Long
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| 35 | If cur = last Then
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| 36 | last = s.Read(buf, 0, size)
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| 37 | cur = 0
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| 38 | If last = 0 Then
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| 39 | Peek = -1
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| 40 | Exit Function
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| 41 | End If
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| 42 | End If
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| 43 | Peek = buf[cur]
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| 44 | End Function
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| 45 |
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[432] | 46 | /*
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| 47 | @date 2008/02/25
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| 48 | @auther Egtra
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| 49 | */
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[426] | 50 | Override Function Read() As Long
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| 51 | Read = Peek()
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[435] | 52 | If Read <> -1 Then
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| 53 | cur++
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| 54 | End If
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[426] | 55 | End Function
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| 56 |
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[432] | 57 | /*
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| 58 | @date 2008/02/26
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| 59 | @auther Egtra
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| 60 | */
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| 61 | Override Function ReadToEnd() As String
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| 62 | Dim sb = New Text.StringBuilder(65536)
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| 63 | sb.Append(buf, cur, last - cur)
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| 64 | Do
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| 65 | Dim read = Read(buf, 0, size)
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| 66 | sb.Append(buf, 0, read)
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| 67 | If read < size Then
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| 68 | ReadToEnd = sb.ToString
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| 69 | Exit Function
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| 70 | End If
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| 71 | Loop
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| 72 | End Function
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| 73 |
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| 74 | Protected
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| 75 | /*
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| 76 | @date 2008/02/25
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| 77 | @auther Egtra
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| 78 | */
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| 79 | Override Sub Dispose(disposing As Boolean)
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| 80 | If disposing Then
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| 81 | If Not ActiveBasic.IsNothing(s) Then
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| 82 | s.Dispose(True)
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| 83 | End If
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[426] | 84 | End If
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[432] | 85 | s = Nothing
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| 86 | size = 0
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| 87 | cur = 0
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| 88 | last = 0
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| 89 | End Sub
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[426] | 90 |
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[432] | 91 | /*
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| 92 | @date 2008/02/25
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| 93 | @auther Egtra
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| 94 | */
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| 95 | Override Function ReadImpl(buffer As *StrChar, index As Long, count As Long) As Long
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[426] | 96 | Dim n = last - cur
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| 97 | If count <= n Then
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[432] | 98 | ReadImpl = ReadFromBuffer(buffer, index, count)
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[426] | 99 | Exit Function
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| 100 | End If
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| 101 | Dim p = VarPtr(buffer[index])
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[432] | 102 | ReadImpl = ReadFromBuffer(p, 0, n)
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| 103 | If ReadImpl = count Then 'バッファの中身で足りた場合
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[426] | 104 | Exit Function
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| 105 | End If
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| 106 | p = VarPtr(p[n])
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| 107 | count -= n
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| 108 | If count > size Then
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| 109 | n = (count \ size) * size 'sizeの倍数分だけは直接bufferへ読み込ませる
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| 110 | Dim read = s.Read(p, 0, n)
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| 111 | If read = 0 Then 'EOF
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| 112 | Exit Function
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| 113 | End If
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| 114 | p = VarPtr(p[n])
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[432] | 115 | ReadImpl += n
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[426] | 116 | count -= n
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| 117 | End If
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| 118 | last = s.Read(buffer, 0, size)
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| 119 | cur = 0
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| 120 | If last = 0 Then 'EOF
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| 121 | Exit Function
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| 122 | End If
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[432] | 123 | ReadImpl += ReadFromBuffer(p, 0, Math.Min(last, count))
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[426] | 124 | End Function
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| 125 |
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| 126 | Private
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[432] | 127 | /*
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| 128 | @date 2008/02/25
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| 129 | @auther Egtra
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| 130 | */
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[426] | 131 | Sub init(str As Stream)
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| 132 | s = str
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| 133 | size = 4096
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| 134 | last = 0
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| 135 | cur = 0
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| 136 | buf = GC_malloc(size)
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| 137 | End Sub
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| 138 |
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| 139 | /**
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| 140 | @brief バッファの中身から読み取る。
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[432] | 141 | @date 2008/02/25
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| 142 | @auther Egtra
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[426] | 143 | 文字数が足りなくても、元のストリームまで読みには行かない。
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| 144 | */
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| 145 | Function ReadFromBuffer(p As *StrChar, index As Long, count As Long) As Long
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| 146 | memcpy(VarPtr(p[index]), VarPtr(buf[cur]), count * SizeOf (StrChar))
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| 147 | cur += count
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| 148 | ReadFromBuffer = count
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| 149 | End Function
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| 150 |
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| 151 | s As Stream
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| 152 | size As Long
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| 153 | cur As Long
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| 154 | last As Long '中身の終わり
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[432] | 155 | buf As *SByte '暫定
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[271] | 156 | End Class
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| 157 |
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| 158 | End Namespace
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| 159 | End Namespace
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