1 | Namespace System
|
---|
2 | Namespace IO
|
---|
3 |
|
---|
4 | Class StreamReader
|
---|
5 | Inherits TextReader
|
---|
6 | Public
|
---|
7 | Sub StreamReader(path As String)
|
---|
8 | init(New FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
|
---|
9 | End Sub
|
---|
10 |
|
---|
11 | Sub StreamReader(stream As Stream)
|
---|
12 | init(stream)
|
---|
13 | End Sub
|
---|
14 |
|
---|
15 | Override Sub Dispose(disposing As Boolean)
|
---|
16 | s.Dispose(disposing)
|
---|
17 | size = 0
|
---|
18 | cur = 0
|
---|
19 | last = 0
|
---|
20 | End Sub
|
---|
21 |
|
---|
22 | Override Function Peek() As Long
|
---|
23 | If cur = last Then
|
---|
24 | last = s.Read(buf, 0, size)
|
---|
25 | cur = 0
|
---|
26 | If last = 0 Then
|
---|
27 | Peek = -1
|
---|
28 | Exit Function
|
---|
29 | End If
|
---|
30 | End If
|
---|
31 | Peek = buf[cur]
|
---|
32 | End Function
|
---|
33 |
|
---|
34 | Override Function Read() As Long
|
---|
35 | Read = Peek()
|
---|
36 | cur++
|
---|
37 | End Function
|
---|
38 |
|
---|
39 | Override Function Read(buffer As *StrChar, index As Long, count As Long) As Long
|
---|
40 | If buffer = 0 Then
|
---|
41 | ElseIf index < 0 Then
|
---|
42 | ElseIf count < 0 Then
|
---|
43 | End If
|
---|
44 |
|
---|
45 | Dim n = last - cur
|
---|
46 | If count <= n Then
|
---|
47 | Read = ReadFromBuffer(buffer, index, count)
|
---|
48 | Exit Function
|
---|
49 | End If
|
---|
50 | Dim p = VarPtr(buffer[index])
|
---|
51 | Read = ReadFromBuffer(p, 0, n)
|
---|
52 | If Read = count Then 'バッファの中身で足りた場合
|
---|
53 | Exit Function
|
---|
54 | End If
|
---|
55 | p = VarPtr(p[n])
|
---|
56 | count -= n
|
---|
57 | If count > size Then
|
---|
58 | n = (count \ size) * size 'sizeの倍数分だけは直接bufferへ読み込ませる
|
---|
59 | Dim read = s.Read(p, 0, n)
|
---|
60 | If read = 0 Then 'EOF
|
---|
61 | Exit Function
|
---|
62 | End If
|
---|
63 | p = VarPtr(p[n])
|
---|
64 | Read += n
|
---|
65 | count -= n
|
---|
66 | End If
|
---|
67 | last = s.Read(buffer, 0, size)
|
---|
68 | cur = 0
|
---|
69 | If last = 0 Then 'EOF
|
---|
70 | Exit Function
|
---|
71 | End If
|
---|
72 | Read += ReadFromBuffer(p, 0, Math.Min(last, count))
|
---|
73 | End Function
|
---|
74 |
|
---|
75 | Override Function ReadLine() As String
|
---|
76 | Dim sb = New Text.StringBuilder(256)
|
---|
77 | Do
|
---|
78 | Dim ch = Read()
|
---|
79 | If ch = &h0D Then
|
---|
80 | If Peek() = &h0A Then
|
---|
81 | Read() 'CR LFの場合
|
---|
82 | End If
|
---|
83 | Exit Do
|
---|
84 | End If
|
---|
85 | Select Case ch
|
---|
86 | Case -1 'EOF
|
---|
87 | Exit Do
|
---|
88 | Case &h0A 'LF
|
---|
89 | Exit Do
|
---|
90 | Case &h0B 'VT
|
---|
91 | Exit Do
|
---|
92 | Case &h0C 'FF
|
---|
93 | Exit Do
|
---|
94 | Case &h0D 'CR
|
---|
95 | Exit Do
|
---|
96 | ' Case &h85 'NEL
|
---|
97 | ' Exit Do
|
---|
98 | ' Case &h2028 'LS
|
---|
99 | ' Exit Do
|
---|
100 | ' Case &h2029 'PS
|
---|
101 | ' Exit Do
|
---|
102 | End Select
|
---|
103 | sb.Append(ch As StrChar) 'ToDo キャスト不要にすべきというチケットを書くこと
|
---|
104 | Loop
|
---|
105 | ReadLine = sb.ToString
|
---|
106 | End Function
|
---|
107 |
|
---|
108 | Override Function ReadToEnd() As String
|
---|
109 | End Function
|
---|
110 |
|
---|
111 | Private
|
---|
112 | Sub init(str As Stream)
|
---|
113 | s = str
|
---|
114 | size = 4096
|
---|
115 | last = 0
|
---|
116 | cur = 0
|
---|
117 | buf = GC_malloc(size)
|
---|
118 | End Sub
|
---|
119 |
|
---|
120 | /**
|
---|
121 | @brief バッファの中身から読み取る。
|
---|
122 | 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。
|
---|
123 | */
|
---|
124 | Function ReadFromBuffer(p As *StrChar, index As Long, count As Long) As Long
|
---|
125 | memcpy(VarPtr(p[index]), VarPtr(buf[cur]), count * SizeOf (StrChar))
|
---|
126 | cur += count
|
---|
127 | ReadFromBuffer = count
|
---|
128 | End Function
|
---|
129 |
|
---|
130 | s As Stream
|
---|
131 | size As Long
|
---|
132 | cur As Long
|
---|
133 | last As Long '中身の終わり
|
---|
134 | buf As *Byte '暫定
|
---|
135 | End Class
|
---|
136 |
|
---|
137 | End Namespace
|
---|
138 | End Namespace
|
---|