BitMiracle.LibJpeg.Classic.Internal.jpeg_marker_reader.next_marker C# (CSharp) Method

        public bool next_marker()
        {
            int c;
            for (;;)
            {
                if (!m_cinfo.m_src.GetByte(out c))
                    return false;

                /* Skip any non-FF bytes.
                 * This may look a bit inefficient, but it will not occur in a valid file.
                 * We sync after each discarded byte so that a suspending data source
                 * can discard the byte from its buffer.
                 */
                while (c != 0xFF)
                {
                    m_cinfo.m_marker.m_discarded_bytes++;
                    if (!m_cinfo.m_src.GetByte(out c))
                        return false;
                }

                /* This loop swallows any duplicate FF bytes.  Extra FFs are legal as
                 * pad bytes, so don't count them in discarded_bytes.  We assume there
                 * will not be so many consecutive FF bytes as to overflow a suspending
                 * data source's input buffer.
                 */
                do
                {
                    if (!m_cinfo.m_src.GetByte(out c))
                        return false;
                }
                while (c == 0xFF);

                if (c != 0)
                {
                    /* found a valid marker, exit loop */
                    break;
                }

                /* Reach here if we found a stuffed-zero data sequence (FF/00).
                 * Discard it and loop back to try again.
                 */
                m_cinfo.m_marker.m_discarded_bytes += 2;
            }

            if (m_cinfo.m_marker.m_discarded_bytes != 0)
            {
                m_cinfo.WARNMS(J_MESSAGE_CODE.JWRN_EXTRANEOUS_DATA, m_cinfo.m_marker.m_discarded_bytes, c);
                m_cinfo.m_marker.m_discarded_bytes = 0;
            }

            m_cinfo.m_unread_marker = c;
            return true;
        }