CSJ2K.j2k.codestream.reader.PktDecoder.readSOPMarker C# (CSharp) Method

        public virtual bool readSOPMarker(int[] nBytes, int p, int c, int r)
        {
            int val;
            byte[] sopArray = new byte[6];
            int tIdx = src.TileIdx;
            int mins = (r == 0)?0:1;
            int maxs = (r == 0)?1:4;
            bool precFound = false;
            for (int s = mins; s < maxs; s++)
            {
                if (p < ppinfo[c][r].Length)
                {
                    precFound = true;
                }
            }
            if (!precFound)
            {
                return false;
            }

            // If SOP markers are not used, return
            if (!sopUsed)
            {
                return false;
            }

            // Check if SOP is used for this packet
            int pos = ehs.Pos;
            if ((short) ((ehs.read() << 8) | ehs.read()) != CSJ2K.j2k.codestream.Markers.SOP)
            {
                ehs.seek(pos);
                return false;
            }
            ehs.seek(pos);

            // If length of SOP marker greater than remaining bytes to read for
            // this tile return true
            if (nBytes[tIdx] < 6)
            {
                return true;
            }
            nBytes[tIdx] -= 6;

            // Read marker into array 'sopArray'
            ehs.readFully(sopArray, 0, CSJ2K.j2k.codestream.Markers.SOP_LENGTH);

            // Check if this is the correct marker
            val = sopArray[0];
            val <<= 8;
            val |= sopArray[1];
            if (val != CSJ2K.j2k.codestream.Markers.SOP)
            {
                throw new System.InvalidOperationException("Corrupted Bitstream: Could not parse SOP " + "marker !");
            }

            // Check if length is correct
            val = (sopArray[2] & 0xff);
            val <<= 8;
            val |= (sopArray[3] & 0xff);
            if (val != 4)
            {
                throw new System.InvalidOperationException("Corrupted Bitstream: Corrupted SOP marker !");
            }

            // Check if sequence number if ok
            val = (sopArray[4] & 0xff);
            val <<= 8;
            val |= (sopArray[5] & 0xff);

            if (!pph && val != pktIdx)
            {
                throw new System.InvalidOperationException("Corrupted Bitstream: SOP marker out of " + "sequence !");
            }
            if (pph && val != pktIdx - 1)
            {
                // if packed packet headers are used, packet header was read
                // before SOP marker segment
                throw new System.InvalidOperationException("Corrupted Bitstream: SOP marker out of " + "sequence !");
            }
            return false;
        }