1 | Namespace System
|
---|
2 | Namespace IO
|
---|
3 |
|
---|
4 | /* ほんとはmiscに入れるかかファイルを分けたほうがいいかもしれないが一先ず実装 */
|
---|
5 | Enum FileOptions
|
---|
6 | None = 0
|
---|
7 | Asynchronous = FILE_FLAG_OVERLAPPED
|
---|
8 | DeleteOnClose = FILE_FLAG_DELETE_ON_CLOSE
|
---|
9 | Encrypted = FILE_ATTRIBUTE_ENCRYPTED
|
---|
10 | RandomAccess = FILE_FLAG_RANDOM_ACCESS
|
---|
11 | SequentialScan = FILE_FLAG_SEQUENTIAL_SCAN
|
---|
12 | WriteThrough = FILE_FLAG_WRITE_THROUGH
|
---|
13 | End Enum
|
---|
14 |
|
---|
15 | Class FileStream
|
---|
16 | Inherits Stream
|
---|
17 |
|
---|
18 | handle As HANDLE
|
---|
19 |
|
---|
20 | /*
|
---|
21 | ファイルハンドルからこれらを取得できれば、これらは入らないが
|
---|
22 | 今のところは不明なので自前で実装するしかない
|
---|
23 | */
|
---|
24 | filePath As String
|
---|
25 | fileMode As DWord
|
---|
26 | fileAccess As DWord
|
---|
27 | fileShare As DWord
|
---|
28 | fileOptions As DWord
|
---|
29 | ownsHandle As Boolean
|
---|
30 |
|
---|
31 | offset As QWord 'オーバーラップドIO用
|
---|
32 |
|
---|
33 | Sub _Initialize(path As String, mode As FileMode, access As FileAccess, share As FileShare, options As FileOptions)
|
---|
34 | If ActiveBasic.IsNothing(path) Then
|
---|
35 | Throw New ArgumentNullException("path")
|
---|
36 | ElseIf path.Length = 0 Then
|
---|
37 | Throw New ArgumentException
|
---|
38 | End If
|
---|
39 |
|
---|
40 |
|
---|
41 | Dim ac = access As DWord
|
---|
42 | Dim sh = share As DWord
|
---|
43 | Dim mo = mode As DWord
|
---|
44 | Dim op = options As DWord
|
---|
45 | ' If (Environment.OSVersion.Platform As DWord) <> (PlatformID.Win32NT As DWord) Then 'ToDo: なぜかアクセス違反になる
|
---|
46 | op And= Not FILE_FLAG_OVERLAPPED
|
---|
47 | ' End If
|
---|
48 |
|
---|
49 | This.handle=CreateFile(ToTCStr(path),ac,sh,ByVal NULL,mo,op,0)
|
---|
50 | If This.handle=INVALID_HANDLE_VALUE Then
|
---|
51 | 'エラー処理
|
---|
52 | 'Throw ArgumentException
|
---|
53 | 'Throw IOException
|
---|
54 | 'Throw System.IO.FileNotFoundException
|
---|
55 | This.handle=0
|
---|
56 | Detail.ThrowWinLastErrorIOException("Failed to open/create file.")
|
---|
57 | Exit Sub
|
---|
58 | End If
|
---|
59 |
|
---|
60 | This.filePath = path
|
---|
61 | This.fileMode = mo
|
---|
62 | This.fileAccess = ac
|
---|
63 | This.fileShare = sh
|
---|
64 | This.fileOptions = op
|
---|
65 | This.offset = 0
|
---|
66 | This.ownsHandle = True
|
---|
67 |
|
---|
68 | If FileMode.Append = This.fileMode Then
|
---|
69 | Seek(0, SeekOrigin.End)
|
---|
70 | End If
|
---|
71 | End Sub
|
---|
72 |
|
---|
73 | Public
|
---|
74 | /* コンストラクタ.NETと同じように実装は難しい、一先ず動くものを実装したが変更が必要だと思う */
|
---|
75 | Sub FileStream(path As String, mode As FileMode, access As FileAccess, share As FileShare, options As FileOptions)
|
---|
76 | _Initialize( path, mode, access, share, options )
|
---|
77 | End Sub
|
---|
78 | Sub FileStream(path As String, mode As FileMode, access As FileAccess, share As FileShare)
|
---|
79 | _Initialize(path,mode,access,share,FileOptions.None)
|
---|
80 | End Sub
|
---|
81 | Sub FileStream(path As String, mode As FileMode, access As FileAccess)
|
---|
82 | _Initialize(path,mode,access,FileShare.None,FileOptions.None)
|
---|
83 | End Sub
|
---|
84 | Sub FileStream(path As String, mode As FileMode)
|
---|
85 | Dim access As FileAccess
|
---|
86 | Select Case mode
|
---|
87 | Case FileMode.Append
|
---|
88 | access=FileAccess.Write
|
---|
89 | Case FileMode.Create
|
---|
90 | access=FileAccess.ReadWrite
|
---|
91 | Case FileMode.CreateNew
|
---|
92 | access=FileAccess.ReadWrite
|
---|
93 | Case FileMode.Open
|
---|
94 | access=FileAccess.ReadWrite
|
---|
95 | Case FileMode.OpenOrCreate
|
---|
96 | access=FileAccess.ReadWrite
|
---|
97 | Case FileMode.Truncate
|
---|
98 | access=FileAccess.Write
|
---|
99 | End Select
|
---|
100 | _Initialize(path,mode,access,FileShare.None,FileOptions.None)
|
---|
101 | End Sub
|
---|
102 | /*
|
---|
103 | @date 2008/02/26
|
---|
104 | @auther Egtra
|
---|
105 | '不要になったら削除すること
|
---|
106 | */
|
---|
107 | Sub FileStream(h As HANDLE, access As FileAccess, owns As Boolean)
|
---|
108 | handle = h
|
---|
109 | fileAccess = access As DWord
|
---|
110 | ownsHandle = owns
|
---|
111 | End Sub
|
---|
112 |
|
---|
113 | Public
|
---|
114 | /*!
|
---|
115 | @brief ファイルが読み込みに対応しているかを返す
|
---|
116 | */
|
---|
117 | Override Function CanRead() As Boolean
|
---|
118 | If This.fileAccess And GENERIC_READ Then
|
---|
119 | Return True
|
---|
120 | Else
|
---|
121 | Return False
|
---|
122 | End If
|
---|
123 | End Function
|
---|
124 |
|
---|
125 | /*!
|
---|
126 | @brief ファイルがシークに対応しているかを返す
|
---|
127 | */
|
---|
128 | Override Function CanSeek() As Boolean
|
---|
129 | If GetFileType(This.handle)=FILE_TYPE_DISK Then
|
---|
130 | Return True
|
---|
131 | Else
|
---|
132 | Return False
|
---|
133 | End If
|
---|
134 | End Function
|
---|
135 |
|
---|
136 | ' Override Function CanTimeout() As Boolean
|
---|
137 | ' /* ファイルがタイムアウトに対応しているかを返す */
|
---|
138 | ' Return False /*今のところ対応していないのでFalse*/
|
---|
139 | ' End Function*/
|
---|
140 |
|
---|
141 | /*!
|
---|
142 | @brief ファイルが書き込みに対応しているかを返す
|
---|
143 | */
|
---|
144 | Override Function CanWrite() As Boolean
|
---|
145 | If This.fileAccess And GENERIC_WRITE Then
|
---|
146 | Return True
|
---|
147 | Else
|
---|
148 | Return False
|
---|
149 | End If
|
---|
150 | End Function
|
---|
151 |
|
---|
152 | Function Handle() As HANDLE
|
---|
153 | Return handle
|
---|
154 | End Function
|
---|
155 |
|
---|
156 | /*!
|
---|
157 | @brief ファイルが非同期操作に対応しているかを返す
|
---|
158 | */
|
---|
159 | Function IsAsync() As Boolean
|
---|
160 | If This.fileOptions And FILE_FLAG_OVERLAPPED /*FileOptions.Asynchronous*/ Then
|
---|
161 | Return True
|
---|
162 | Else
|
---|
163 | Return False
|
---|
164 | End If
|
---|
165 | End Function
|
---|
166 |
|
---|
167 | Override Function Length() As Int64
|
---|
168 | disposedCheck()
|
---|
169 | If This.CanSeek() Then
|
---|
170 | Dim length = VarPtr(Length) As *ULARGE_INTEGER
|
---|
171 | length->LowPart = GetFileSize(This.handle, VarPtr(length->HighPart))
|
---|
172 | If LODWORD(Length) = INVALID_FILE_SIZE Then
|
---|
173 | Dim error = GetLastError()
|
---|
174 | If error <> NO_ERROR Then
|
---|
175 | ' Detail.ThrowWinIOException("FileStream.Read: Failed to read.", error)
|
---|
176 | End If
|
---|
177 | End If
|
---|
178 |
|
---|
179 | If Length < 0 Then
|
---|
180 | Debug 'Throw OverflowException
|
---|
181 | End If
|
---|
182 | End If
|
---|
183 | End Function
|
---|
184 |
|
---|
185 | Function Name() As String
|
---|
186 | Return This.filePath
|
---|
187 | End Function
|
---|
188 |
|
---|
189 | Override Sub Position(value As Int64)
|
---|
190 | disposedCheck()
|
---|
191 | If This.CanSeek() Then
|
---|
192 | If This.IsAsync() Then
|
---|
193 | offset = value As QWord
|
---|
194 | Else
|
---|
195 | Dim position As LARGE_INTEGER
|
---|
196 | position.LowPart=LODWORD(value)
|
---|
197 | position.HighPart=HIDWORD(value)
|
---|
198 | SetFilePointer(This.handle,position.LowPart,VarPtr(position.HighPart) As *DWord,FILE_BEGIN)
|
---|
199 | End If
|
---|
200 | End If
|
---|
201 | End Sub
|
---|
202 | Override Function Position() As Int64
|
---|
203 | disposedCheck()
|
---|
204 | If This.CanSeek() Then
|
---|
205 | If This.IsAsync() Then
|
---|
206 | Return offset As Int64
|
---|
207 | Else
|
---|
208 | Dim position As LARGE_INTEGER
|
---|
209 | ZeroMemory(VarPtr(position),SizeOf(LARGE_INTEGER))
|
---|
210 | position.LowPart=SetFilePointer(This.handle,position.LowPart,VarPtr(position.HighPart) As *DWord,FILE_CURRENT)
|
---|
211 | Return MAKEQWORD(position.LowPart,position.HighPart) As Int64
|
---|
212 | End If
|
---|
213 | End If
|
---|
214 | End Function
|
---|
215 |
|
---|
216 | /* Override Sub ReadTimeout(value As Long)
|
---|
217 | 'TODO
|
---|
218 | End Sub
|
---|
219 | Override Function ReadTimeout() As Long
|
---|
220 | 'TODO
|
---|
221 | End Function*/
|
---|
222 |
|
---|
223 | /* Safe~Handle系の実装は要相談!! */
|
---|
224 | /* Function SafeFileHandle() As SafeFileHandle
|
---|
225 | End Function*/
|
---|
226 |
|
---|
227 | Override Sub WriteTimeout(value As Long)
|
---|
228 | 'TODO
|
---|
229 | End Sub
|
---|
230 | Override Function WriteTimeout() As Long
|
---|
231 | 'TODO
|
---|
232 | End Function
|
---|
233 |
|
---|
234 |
|
---|
235 | Public
|
---|
236 | Override Function BeginRead(buffer As *Byte, offset As Long, count As Long, callback As AsyncCallback, state As Object) As System.IAsyncResult
|
---|
237 | If This.IsAsync() Then
|
---|
238 | Else
|
---|
239 | Read(buffer,offset,count)
|
---|
240 | End If
|
---|
241 | End Function
|
---|
242 |
|
---|
243 | Override Function BeginWrite(buffer As *Byte, offset As Long, count As Long, callback As AsyncCallback, state As Object) As System.IAsyncResult
|
---|
244 | If This.IsAsync() Then
|
---|
245 | Else
|
---|
246 | Write(buffer,offset,count)
|
---|
247 | End If
|
---|
248 | End Function
|
---|
249 |
|
---|
250 | /* CreateObjRef*/
|
---|
251 |
|
---|
252 | Override Function EndRead(asyncResult As System.IAsyncResult) As Long
|
---|
253 | 'TODO
|
---|
254 | End Function
|
---|
255 |
|
---|
256 | Override Sub EndWrite(asyncResult As System.IAsyncResult)
|
---|
257 | 'TODO
|
---|
258 | End Sub
|
---|
259 |
|
---|
260 | /* Equals*/
|
---|
261 |
|
---|
262 | Override Sub Flush()
|
---|
263 | disposedCheck()
|
---|
264 | Dim ret = FlushFileBuffers(This.handle)
|
---|
265 | If ret = FALSE Then
|
---|
266 | ' Detail.ThrowWinLastErrorIOException("FileStream.Read: Failed to read.")
|
---|
267 | End If
|
---|
268 | End Sub
|
---|
269 |
|
---|
270 | /* Function GetAccessControl() As FileSecurity
|
---|
271 | FileSecurityの実装がまだできてない。
|
---|
272 | End Function*/
|
---|
273 |
|
---|
274 | /* GetLifetimeService*/
|
---|
275 |
|
---|
276 | /* Override Function GetType() As TypeInfo
|
---|
277 | Return Super.GetType()
|
---|
278 | End Function*/
|
---|
279 |
|
---|
280 | /* InitializeLifetimeService*/
|
---|
281 |
|
---|
282 | Sub Lock(position As Int64, length As Int64)
|
---|
283 | disposedCheck()
|
---|
284 | If position < 0 Then
|
---|
285 | Throw New ArgumentOutOfRangeException("FileStream.Lock: An argument is negative value.", New System.Int64(position), "position")
|
---|
286 | ElseIf length < 0 Then
|
---|
287 | Throw New ArgumentOutOfRangeException("FileStream.Lock: An argument is negative value.", New System.Int64(length), "length")
|
---|
288 | End If
|
---|
289 | LockFile(handle, LODWORD(position As QWord), HIDWORD(position As QWord),
|
---|
290 | LODWORD(length As QWord), HIDWORD(length As QWord))
|
---|
291 | End Sub
|
---|
292 |
|
---|
293 | Override Function Read(buffer As *Byte, offset As Long, count As Long) As Long
|
---|
294 | disposedCheck()
|
---|
295 | If buffer = 0 Then
|
---|
296 | Throw New ArgumentNullException("FileStream.Read: An argument is null value.", "buffer")
|
---|
297 | ElseIf Not This.CanRead() Then
|
---|
298 | Throw New NotSupportedException("FileStream.Read: This stream is not readable.")
|
---|
299 | End If
|
---|
300 |
|
---|
301 | Dim ret As BOOL
|
---|
302 | Dim readBytes As DWord
|
---|
303 | If This.IsAsync() Then
|
---|
304 | Dim overlapped As OVERLAPPED
|
---|
305 | SetQWord(VarPtr(overlapped.Offset), offset)
|
---|
306 | overlapped.hEvent = CreateEvent(0, TRUE, FALSE, 0)
|
---|
307 | If overlapped.hEvent = 0 Then
|
---|
308 | Throw New OutOfMemoryException("FileStream.Read: Failed to create an event object.")
|
---|
309 | End If
|
---|
310 | Try
|
---|
311 | ret = ReadFile(This.handle, VarPtr(buffer[offset]), count, 0, overlapped)
|
---|
312 | If ret = FALSE Then
|
---|
313 | Dim error = GetLastError()
|
---|
314 | If error <> ERROR_IO_PENDING Then
|
---|
315 | Detail.ThrowWinIOException("FileStream.Read: Failed to read.", error)
|
---|
316 | End If
|
---|
317 | End If
|
---|
318 | ret = GetOverlappedResult(This.handle, overlapped, readBytes, TRUE)
|
---|
319 | If ret = FALSE Then
|
---|
320 | Detail.ThrowWinLastErrorIOException("FileStream.Read: Failed to read.")
|
---|
321 | End If
|
---|
322 | offset += Read
|
---|
323 | Finally
|
---|
324 | CloseHandle(overlapped.hEvent)
|
---|
325 | End Try
|
---|
326 | Else
|
---|
327 | ret = ReadFile(This.handle,VarPtr(buffer[offset]),count,VarPtr(readBytes),ByVal NULL)
|
---|
328 | If ret = FALSE Then
|
---|
329 | Detail.ThrowWinLastErrorIOException("FileStream.Read: Failed to read.")
|
---|
330 | End If
|
---|
331 | End If
|
---|
332 | Read = readBytes As Long
|
---|
333 | End Function
|
---|
334 |
|
---|
335 | /*!
|
---|
336 | @brief ストリームの現在位置を移動させる。
|
---|
337 | @param[in] offset originからの移動量
|
---|
338 | @param[in] origin 移動の基準位置
|
---|
339 | @return 移動後の新しい現在位置
|
---|
340 | @exception DisposedException 既にストリームが閉じられている場合
|
---|
341 | @exception ArgumentException 移動後の位置が負の位置(ファイル先頭より手前)になる場合
|
---|
342 | @exception IOException その他エラーが発生した場合
|
---|
343 | */
|
---|
344 | Override Function Seek(offset As Int64, origin As SeekOrigin) As Int64
|
---|
345 | disposedCheck()
|
---|
346 | If This.CanSeek() Then
|
---|
347 | If This.IsAsync() Then
|
---|
348 | Select Case origin
|
---|
349 | Case SeekOrigin.Begin
|
---|
350 | This.offset = offset
|
---|
351 | Case SeekOrigin.Current
|
---|
352 | This.offset += offset
|
---|
353 | Case SeekOrigin.End
|
---|
354 | This.offset = This.Length + offset
|
---|
355 | End Select
|
---|
356 | Seek = This.offset As Int64
|
---|
357 | If Seek < 0 Then
|
---|
358 | ' Throw ArgumentException("FileStream.Seek: Cannot seek to negative offset.")
|
---|
359 | End If
|
---|
360 | Else
|
---|
361 | Dim seek = VarPtr(offset) As *ULARGE_INTEGER
|
---|
362 | Dim ret = SetFilePointer(This.handle, seek->LowPart, VarPtr(seek->HighPart), origin As DWord)
|
---|
363 | If ret = INVALID_SET_FILE_POINTER Then
|
---|
364 | Dim error = GetLastError()
|
---|
365 | If error = ERROR_NEGATIVE_SEEK Then
|
---|
366 | ' Throw ArgumentException("FileStream.Seek: Cannot seek to negative offset.")
|
---|
367 | ElseIf error <> NO_ERROR Then
|
---|
368 | ' Throw Detail.ThrowWinIOException("FileStream.Seek: Failed to seek.", error)
|
---|
369 | End If
|
---|
370 | End If
|
---|
371 | seek->LowPart = ret
|
---|
372 | Seek = offset
|
---|
373 | End If
|
---|
374 | End If
|
---|
375 | End Function
|
---|
376 |
|
---|
377 | /* Sub SetAccessControl(fileSecurity As FileSecurity)
|
---|
378 | FileSecurityの実装がまだできてない。
|
---|
379 | End Sub*/
|
---|
380 |
|
---|
381 | Override Sub SetLength(value As Int64)
|
---|
382 | disposedCheck()
|
---|
383 | If This.CanWrite() and This.CanSeek() Then
|
---|
384 | If This.IsAsync() Then
|
---|
385 | Else
|
---|
386 | Dim current = This.Position()
|
---|
387 | This.Position(value)
|
---|
388 | Dim ret = SetEndOfFile(This.handle)
|
---|
389 | If ret = FALSE Then
|
---|
390 | Detail.ThrowWinLastErrorIOException("FileStream.Read: Failed to read.")
|
---|
391 | End If
|
---|
392 | Position = current
|
---|
393 | End If
|
---|
394 | End If
|
---|
395 | End Sub
|
---|
396 |
|
---|
397 | /* Synchronized*/
|
---|
398 |
|
---|
399 | Override Function ToString() As String
|
---|
400 | Return This.Name()
|
---|
401 | End Function
|
---|
402 |
|
---|
403 | Sub Unlock(position As Int64, length As Int64)
|
---|
404 | disposedCheck()
|
---|
405 | If position < 0 Then
|
---|
406 | Throw New ArgumentOutOfRangeException("FileStream.Lock: An argument is negative value.", New System.Int64(position), "position")
|
---|
407 | ElseIf length < 0 Then
|
---|
408 | Throw New ArgumentOutOfRangeException("FileStream.Lock: An argument is negative value.", New System.Int64(length), "length")
|
---|
409 | End If
|
---|
410 | Dim ret = UnlockFile(handle, LODWORD(position As QWord), HIDWORD(position As QWord),
|
---|
411 | LODWORD(length As QWord), HIDWORD(length As QWord))
|
---|
412 | If ret = FALSE Then
|
---|
413 | Detail.ThrowWinLastErrorIOException("FileStream.Read: Failed to read.")
|
---|
414 | End If
|
---|
415 | End Sub
|
---|
416 |
|
---|
417 | Override Sub Write(buffer As *Byte, offset As Long, count As Long)
|
---|
418 | disposedCheck()
|
---|
419 | If This.CanWrite() Then
|
---|
420 | Dim writeBytes As DWord
|
---|
421 | If This.IsAsync() Then
|
---|
422 | Dim overlapped As OVERLAPPED
|
---|
423 | SetQWord(VarPtr(overlapped.Offset), offset)
|
---|
424 | overlapped.hEvent = CreateEvent(0, TRUE, FALSE, 0)
|
---|
425 | Dim ret = WriteFile(This.handle, VarPtr(buffer[offset]), count, 0, overlapped)
|
---|
426 | If ret <> FALSE Or GetLastError() = ERROR_IO_PENDING Then
|
---|
427 | GetOverlappedResult(This.handle, overlapped, writeBytes, TRUE)
|
---|
428 | End If
|
---|
429 | offset += writeBytes
|
---|
430 | CloseHandle(overlapped.hEvent)
|
---|
431 | Else
|
---|
432 | WriteFile(This.handle, VarPtr(buffer[offset]), count, VarPtr(writeBytes), ByVal NULL)
|
---|
433 | End If
|
---|
434 | End If
|
---|
435 | End Sub
|
---|
436 |
|
---|
437 | Protected
|
---|
438 | Override Sub Dispose(disposing As Boolean)
|
---|
439 | If handle <> 0 Then
|
---|
440 | Flush()
|
---|
441 | CloseHandle(InterlockedExchangePointer(ByVal VarPtr(handle), NULL))
|
---|
442 | End If
|
---|
443 | End Sub
|
---|
444 |
|
---|
445 | Override Function CreateWaitHandle() As System.Threading.WaitHandle
|
---|
446 | Return New System.Threading.AutoResetEvent(False)
|
---|
447 | End Function
|
---|
448 |
|
---|
449 | Private
|
---|
450 | Sub disposedCheck()
|
---|
451 | If handle = 0 Then
|
---|
452 | ' Throw ObjectDisposedException("FileStream: This stream has closed.")
|
---|
453 | End If
|
---|
454 | End Sub
|
---|
455 |
|
---|
456 | End Class
|
---|
457 |
|
---|
458 |
|
---|
459 | End Namespace
|
---|
460 | End Namespace
|
---|