Question

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I have written a small method to fill a byte[] just like the MemoryStream :

public static Stream FillWithPadding(Stream MS, int Count)
{
    byte[] buffer = new byte[64];
    for (int i = 0; i < buffer.Length; i++)
    {
        buffer[i] = 0xFF;
    }
    while (Count > buffer.Length)
    {
        MS.Write(buffer, 0, buffer.Length);
        Count -= buffer.Length;
    }
    MS.Write(buffer, 0, Count);
    return MS;
}

public static byte[] FillWithPadding(byte[] Buffer, int Count)
{
    using (MemoryStream MS = new MemoryStream())
    {
        MS.Write(Buffer, 0, Buffer.Length);
        MemoryStream msw = FillWithPadding(MS, Count) as MemoryStream;
        return msw.GetBuffer();
    }
}

This code is not working!!

Instead it is creating 0xFF + 0x00 at the End!

Can anyone Please clear-up, Why this does not work??

Answer 1

MemoryStream.GetBuffer() returns internal byte array that MemoryStream uses to store data. Initially it filled with 0, and filled up to stream length by Write’s.

Most likely you want to use MemoryStream.ToArray() instead that returns copy of the buffer truncated to actual length.