1 | 'Classes/System/IO/StreamReader.ab
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2 |
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3 | Namespace System
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4 | Namespace IO
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5 |
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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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11 | Class StreamReader
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12 | Inherits TextReader
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13 | Public
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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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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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21 |
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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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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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30 | Public
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31 | /*
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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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40 |
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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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51 | End If
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52 | s = Nothing
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53 | End Sub
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54 |
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55 | /*
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56 | @date 2008/12/27
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57 | @auther Egtra
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58 | */
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59 | Override Function Underflow() As Boolean
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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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70 | Underflow = False
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71 | Exit Function
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72 | End If
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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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76 | Do
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77 | Dim q = e.NextChar(pNext, ((mbBuf + mbLen) - pNext) As Long)
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78 | If q = pNext Then
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79 | Exit Do
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80 | End If
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81 | pNext = q
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82 | Loop
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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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95 | End If
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96 | Underflow = True
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97 | End Function
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98 | Private
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99 |
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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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104 | Sub init(str As Stream)
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105 | s = str
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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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110 | End Sub
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111 |
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112 | s As Stream
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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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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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