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136 lines
3.9 KiB
136 lines
3.9 KiB
#Region "Microsoft.VisualBasic::818ceae909cb9e972a33ac881e939577, ComputingServices\FileSystem\Protocols\FileStreamInfo.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Class FileStreamInfo
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'
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' Properties: CanRead, CanSeek, CanWrite, FileHandle, IsAsync
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'
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' Constructor: (+1 Overloads) Sub New
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' Function: GetInfo
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'
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' Class SeekArgs
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'
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' Properties: offset, origin
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'
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' Constructor: (+2 Overloads) Sub New
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' Function: Seek
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'
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' Class LockArgs
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'
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' Properties: length, Lock, position
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'
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' Constructor: (+2 Overloads) Sub New
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' Sub: LockOrNot
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System.IO
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Imports Microsoft.VisualBasic.Net.Protocols
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Imports Microsoft.VisualBasic.Net.Protocols.Reflection
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Imports Microsoft.VisualBasic.Serialization
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Namespace FileSystem.Protocols
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Public Class FileStreamInfo : Inherits FileHandle
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Public Property CanRead As Boolean
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Public Property CanSeek As Boolean
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Public Property CanWrite As Boolean
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Public Property FileHandle As IntPtr
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Public Property IsAsync As Boolean
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Sub New()
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End Sub
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Public Shared Function GetInfo(file As FileStream) As FileStreamInfo
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#Disable Warning
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Dim handle As New FileStreamInfo With {
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.HashCode = file.GetHashCode,
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.CanRead = file.CanRead,
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.CanSeek = file.CanSeek,
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.CanWrite = file.CanWrite,
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.FileHandle = file.Handle,
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.IsAsync = file.IsAsync
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} ' 可能会出现重复的文件名，所以使用这个句柄对象来进行唯一标示
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#Enable Warning
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Return handle
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End Function
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End Class
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Public Class SeekArgs : Inherits FileHandle
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Public Property offset As Long
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Public Property origin As Integer
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Sub New(handle As FileHandle)
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Call MyBase.New(handle)
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End Sub
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Sub New()
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End Sub
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Public Function Seek(stream As System.IO.FileStream) As Long
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Dim ori As SeekOrigin = CType(origin, SeekOrigin)
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Return stream.Seek(offset, ori)
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End Function
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End Class
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Public Class LockArgs : Inherits FileHandle
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Public Property Lock As Boolean
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Public Property position As Long
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Public Property length As Long
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Sub New(handle As FileHandle)
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Call MyBase.New(handle)
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End Sub
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Sub New()
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End Sub
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Public Sub LockOrNot(stream As System.IO.FileStream)
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If Lock Then
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Call stream.Lock(position, length)
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Else
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Call stream.Unlock(position, length)
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End If
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End Sub
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End Class
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End Namespace
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