40 lines
1.7 KiB
VB.net
40 lines
1.7 KiB
VB.net
Imports System.IO
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Imports System.IO.MemoryMappedFiles
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Namespace CommandLine
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''' <summary>
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''' + file path: C://path/to/file
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''' + standard input: std_in://
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''' + standard output: std_out://
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''' + memory mapping file: memory://file/uri
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''' </summary>
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Public Module StreamExtensions
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Public Function OpenForRead(reference As String) As Stream
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If reference.TextEquals("std_in://") Then
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Return Console.OpenStandardInput
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ElseIf reference.TextEquals("std_out://") Then
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Throw New InvalidProgramException()
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ElseIf reference.ToLower.StartsWith("memory://") Then
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reference = reference.GetTagValue(":/").Value
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Return MemoryMappedFile.OpenExisting(reference).CreateViewStream
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Else
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Return New FileStream(reference, FileMode.Open, access:=FileAccess.Read, share:=FileShare.ReadWrite)
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End If
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End Function
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Public Function OpenForWrite(reference As String, Optional size& = 1024 * 1024 * 1024) As Stream
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If reference.TextEquals("std_in://") Then
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Throw New InvalidProgramException
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ElseIf reference.TextEquals("std_out://") Then
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Return Console.OpenStandardOutput
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ElseIf reference.ToLower.StartsWith("memory://") Then
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reference = reference.GetTagValue(":/").Value
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Return MemoryMappedFile.CreateOrOpen(reference, size).CreateViewStream
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Else
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Return New FileStream(reference, FileMode.OpenOrCreate, access:=FileAccess.Write, share:=FileShare.Read)
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End If
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End Function
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End Module
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End Namespace |