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 The ZipInputStream objects read method is returning the following message when I try to inflate from a byte array. 

 Unable to read from this stream

My code is below: 

Public Shared Function Uncompress_Memory_Data(ByVal bData As Byte()) As Byte()

        Dim strmZipInputStream As ZipInputStream = Nothing
        Dim strmData As MemoryStream
        Dim bResult As Byte() = Nothing
        Dim bTemp As Byte() = Nothing
        Dim iReadSize As Integer = 2048
        Dim iRead As Integer = 0
        Dim iOffset As Integer = 0

        Try
            ' Simple sanity checks
            If bData.Length = 0 Then
                m_Error_Message = "DataCompression.Uncompress_Memory_Data: No data to uncompress."
            Else
                strmData = New MemoryStream(bData)
                strmData.Position = 0
                strmZipInputStream = New ZipInputStream(strmData)
                ReDim bTemp(iReadSize)
                Do While True
                    iRead = strmZipInputStream.Read(bTemp, 0, bTemp.Length)
                    If iRead = 0 Then
                        Exit Do
                    End If
                    Array.Copy(bTemp, 0, bResult, iOffset, iRead)
                    iOffset += iRead
                Loop
            End If
            strmZipInputStream.Close()

        Catch ex As Exception
            m_Error_Message = "DataCompression.Uncompress_Memory_Data " & ex.Message
            bResult = Nothing
        Finally
            strmData = Nothing
            strmZipInputStream = Nothing
            bTemp = Nothing
        End Try

        Return bResult

    End Function

Any help would be appreciated.

Thank you

I have found that after the   "strmZipInputStream = New ZipInputStream(strmData)' statement the ZipInputStream.Available property is equal to 0.

 Does anyone know what could cause this?

Thank you 

The following is a hex dump of the data I am trying to decompress:

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 

Hi,

You should check out the samples to see how to use the library.  You need to get an entry before you can read from the stream.  The ZipInputStream class is not a simple stream at all as the data is structured.

hth,

-jr-

This doesnt look like a zip file...

It is a data stream compresed using zlib.  From what I understand now; I should up the inflater method. Do you have any examples of using this method?