71 lines
2.8 KiB
VB.net
71 lines
2.8 KiB
VB.net
Imports System.IO
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Imports System.IO.Compression
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Imports DigitalData.Modules.Logging
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Friend Class Compression
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Private ReadOnly _logger As Logger
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Public Sub New(LogConfig As LogConfig)
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_logger = LogConfig.GetLogger()
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End Sub
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Public Async Function CompressAsync(data As Byte()) As Task(Of Byte())
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Return Await Task.Run(Function() As Byte()
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Return Compress(data)
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End Function)
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End Function
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Public Function Compress(data As Byte()) As Byte()
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Try
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' ByteArray in Stream umwandeln
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Using originalStream As New MemoryStream(data)
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' Ziel Stream erstellen
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Using compressedStream As New MemoryStream()
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' Gzip-Stream erstellen, der alle Daten komprimiert und zu compressedStream durchleitet
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'
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' > MemoryStream > GzipStream > MemoryStream
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' originalStream --> compressionStream --> compressedFileStream
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'
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Using compressionStream As New GZipStream(compressedStream, CompressionMode.Compress)
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originalStream.CopyTo(compressionStream)
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compressionStream.Close()
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Return compressedStream.ToArray()
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End Using
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End Using
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End Using
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Catch ex As Exception
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_logger.Error(ex)
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Throw ex
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End Try
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End Function
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Public Async Function DecompressAsync(data As Byte()) As Task(Of Byte())
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Return Await Task.Run(Function() As Byte()
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Return Decompress(data)
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End Function)
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End Function
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Public Function Decompress(data As Byte()) As Byte()
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Try
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' ByteArray in Stream umwandeln
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Using compressedStream As New MemoryStream(data)
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' Ziel Stream erstellen
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Using decompressedStream As New MemoryStream()
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' Gzip-Stream erstellen, der alle Daten komprimiert und zu compressedStream durchleitet
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'
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' > MemoryStream > GzipStream > MemoryStream
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' compressedStream --> decompressionStream --> decompressedStream
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'
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Using decompressionStream As New GZipStream(compressedStream, CompressionMode.Decompress)
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decompressionStream.CopyTo(decompressedStream)
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Return decompressedStream.ToArray()
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End Using
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End Using
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End Using
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Catch ex As Exception
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_logger.Error(ex)
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Throw ex
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End Try
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End Function
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End Class
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