Reverse action of ICSharpCode...InflaterInputStream in C#

Question

I'm using ICSharpCode.SharpZipLib.dll for compress and decompress data.
I have the following code that performs inflation of data:

public static byte[] ZLibDecompress(byte[] zLibCompressedBuffer)
{
    byte[] resBuffer = null;

    MemoryStream mInStream = new MemoryStream(zLibCompressedBuffer);
    MemoryStream mOutStream = new MemoryStream(zLibCompressedBuffer.Length);
    InflaterInputStream infStream = new InflaterInputStream(mInStream);

    mInStream.Position = 0;

    try
    {
        byte[] tmpBuffer = new byte[zLibCompressedBuffer.Length];
        int read = 0;

        do
        {
            read = infStream.Read(tmpBuffer, 0, tmpBuffer.Length);
            if (read > 0)
                mOutStream.Write(tmpBuffer, 0, read);

        } while (read > 0);

        resBuffer = mOutStream.ToArray();
    }
    finally
    {
        infStream.Close();
        mInStream.Close();
        mOutStream.Close();
    }

    return resBuffer;
}

This code actually works, and now I want to compress the result back.
So this is my code:

public static byte[] ZLibCompress(byte[] buffer)
{
    byte[] resBuffer = null;

    MemoryStream mOutStream = new MemoryStream(buffer.Length);
    DeflaterOutputStream defStream = new DeflaterOutputStream(mOutStream);

    try
    {
        defStream.Write(buffer, 0, buffer.Length);
        defStream.Flush();
        defStream.Finish();

        resBuffer = mOutStream.ToArray();
    }
    finally
    {
        defStream.Close();
        mOutStream.Close();
    }

    return resBuffer;
}

But two result arrays of two functions arn't equal:

byte[] unCompBuffer = ZipUtils.ZLibDecompress(zLibBuffer);
byte[] compBuffer = ZipUtils.ZLibCompress(unCompBuffer);
bool eq = compBuffer.SequenceEqual(zLibBuffer);

eq is false.
Any ideas?
Thank you for ahead.

Answer 1

Where does the compressed buffer come from? Was it compressed by SharpZipLib too? With the same compression level and options? If not, you shouldn't expect the decompressed/recompressed buffer to be equal to the original...