[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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[627] | 30 | Public
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[432] | 31 | /*
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[627] | 32 | @brief 基になるストリームを取得する
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| 33 | @date 2008/09/02
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| 34 | @auther NoWest
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| 35 | */
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| 36 | Function BaseStream () As Stream
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| 37 | Return s
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| 38 | End Function
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| 39 |
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[426] | 40 |
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[432] | 41 | Protected
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| 42 | /*
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| 43 | @date 2008/02/25
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| 44 | @auther Egtra
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| 45 | */
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| 46 | Override Sub Dispose(disposing As Boolean)
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| 47 | If disposing Then
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| 48 | If Not ActiveBasic.IsNothing(s) Then
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| 49 | s.Dispose(True)
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| 50 | End If
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[426] | 51 | End If
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[432] | 52 | s = Nothing
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| 53 | End Sub
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[426] | 54 |
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[432] | 55 | /*
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[665] | 56 | @date 2008/12/27
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[432] | 57 | @auther Egtra
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| 58 | */
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[665] | 59 | Override Function Underflow() As Boolean
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[673] | 60 | Dim nextRead As *Byte
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| 61 | Dim readSize = s.Read(mbBuf + bufSize, 0, bufCapacity - bufSize)
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| 62 | If readSize = 0 Then
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| 63 | If bufSize <> 0 Then
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| 64 | #ifdef UNCODE
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| 65 | Buffer.Append(&hfffd As WCHAR)
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| 66 | #else
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| 67 | Buffer.Append("?")
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| 68 | #endif
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| 69 | End If
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[665] | 70 | Underflow = False
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[426] | 71 | Exit Function
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| 72 | End If
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[673] | 73 | Dim mbLen = bufSize + readSize
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| 74 | '文字全体が揃っている部分を抽出する。
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| 75 | Dim pNext = mbBuf
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[665] | 76 | Do
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[673] | 77 | Dim q = e.NextChar(pNext, ((mbBuf + mbLen) - pNext) As Long)
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[665] | 78 | If q = pNext Then
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| 79 | Exit Do
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| 80 | End If
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[673] | 81 | pNext = q
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[665] | 82 | Loop
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[673] | 83 | '文字全体が揃っている部分を変換しTextReaderのバッファに送る。
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| 84 | Dim wcBufCapacity = e.GetMaxCharCount(mbLen)
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| 85 | Dim wcBuf = GC_malloc_atomic(wcBufCapacity * SizeOf (WCHAR)) As *WCHAR
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| 86 | Dim wcLen = e.GetChars(mbBuf, (pNext - mbBuf) As Long, wcBuf, wcBufCapacity)
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| 87 | Dim appendStr As PCTSTR
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| 88 | Dim appendLen = GetStr(wcBuf, wcLen As SIZE_T, appendStr)
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| 89 | Dim readerBuffer = Buffer
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| 90 | readerBuffer.Append(appendStr, 0, appendLen)
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| 91 | 'マルチバイトの揃っていない部分を手前に連れてくる。
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| 92 | bufSize = ((mbBuf + mbLen) - pNext) As Long
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| 93 | If bufSize <> 0 Then
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| 94 | memmove(mbBuf, mbBuf + mbLen, bufSize)
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[426] | 95 | End If
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[665] | 96 | Underflow = True
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[426] | 97 | End Function
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[665] | 98 | Private
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[426] | 99 |
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[432] | 100 | /*
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| 101 | @date 2008/02/25
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| 102 | @auther Egtra
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| 103 | */
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[426] | 104 | Sub init(str As Stream)
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| 105 | s = str
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[673] | 106 | e = New Text.Detail.WindowsCodePageEncoding(CP_ACP) '暫定。
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| 107 | bufCapacity = 8192
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| 108 | mbBuf = GC_malloc_atomic(bufCapacity) As *Byte
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| 109 | bufSize = 0
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[426] | 110 | End Sub
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| 111 |
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| 112 | s As Stream
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[673] | 113 | e As Text.Encoding
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| 114 | mbBuf As *Byte
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| 115 | bufSize As Long
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| 116 | bufCapacity As Long
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[271] | 117 | End Class
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| 118 |
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| 119 | End Namespace
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| 120 | End Namespace
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