System.IO.Compression.ZipHelper.AdvanceToPosition C# (CSharp) Méthode

        internal static void AdvanceToPosition(this Stream stream, long position)
        {
            long numBytesLeft = position - stream.Position;
            Debug.Assert(numBytesLeft >= 0);
            while (numBytesLeft != 0)
            {
                const int throwAwayBufferSize = 64;
                int numBytesToSkip = (numBytesLeft > throwAwayBufferSize) ? throwAwayBufferSize : (int)numBytesLeft;
                int numBytesActuallySkipped = stream.Read(new byte[throwAwayBufferSize], 0, numBytesToSkip);
                if (numBytesActuallySkipped == 0)
                    throw new IOException(SR.UnexpectedEndOfStream);
                numBytesLeft -= numBytesActuallySkipped;
            }
        }