Question

I am concerned that this code is copying bytes into a temporary buffer before writing directly to file.

I feel like there should be some method of copying bytes directly from the tail end of the main buffer directly to file.

'this code copies all bytes starting at integer index from the main buffer into a new file: ga.exe

'declare temporary buffer
Dim EXEBytes(bytes.Count - index) As Byte

'copy subset of bytes over, starting at index 
System.Buffer.BlockCopy(bytes, index, EXEBytes, 0, bytes.Count - index)

'write bytes from temporary array into file
File.WriteAllBytes(Server.MapPath("/BIN/ga.exe"), EXEBytes)

Any ideas?

Answer 1

You would be better off using a stream, I believe:

Public Sub WriteFile(bytes As Byte(), index As Integer)
    Using oNewStream As IO.FileStream = IO.File.Open(Server.MapPath("/BIN/ga.exe"), IO.FileMode.Create)
        If oNewStream IsNot Nothing Then
            oNewStream.Write(bytes, index, bytes.Count - index)
            oNewStream.Close()
        End If
    End Using
End Sub