Example #1
0
        /// <summary>
        /// Creates an empty SQItem with no encapsulated data or child elements.
        /// </summary>
        public SQItem(DICOMElementSQ parentElem)
        {
            _parentElem = parentElem;

            ElementsLookup        = new SortedDictionary <uint, DICOMElement>();
            Elements              = new List <DICOMElement>();
            lengthValid           = false;
            EncapsulatedImageData = null;
        }
Example #2
0
        /// <summary>
        /// Returns a new DICOMElement object of the correct VR, using the specified Group and Element
        /// </summary>
        /// <param name="group">A DICOM Group Tag</param>
        /// <param name="elem">A DICOM Element Tag</param>
        /// <param name="vr">A DICOM Value Representation (VR), a two character string</param>
        /// <returns>A new DICOMElement encapsulating theh specified group, element, and VR.</returns>
        public static DICOMElement CreateByVR(ushort group, ushort elem, ushort vr)
        {
            DICOMElement ret = null;

            if (vr == DICOMElementAE.vrshort)
            {
                ret = new DICOMElementAE(group, elem);
            }
            else if (vr == DICOMElementAS.vrshort)
            {
                ret = new DICOMElementAE(group, elem);
            }
            else if (vr == DICOMElementAT.vrshort)
            {
                ret = new DICOMElementAT(group, elem);
            }
            else if (vr == DICOMElementCS.vrshort)
            {
                ret = new DICOMElementCS(group, elem);
            }
            else if (vr == DICOMElementDA.vrshort)
            {
                ret = new DICOMElementDA(group, elem);
            }
            else if (vr == DICOMElementDS.vrshort)
            {
                ret = new DICOMElementDS(group, elem);
            }
            else if (vr == DICOMElementDT.vrshort)
            {
                ret = new DICOMElementDT(group, elem);
            }
            else if (vr == DICOMElementFD.vrshort)
            {
                ret = new DICOMElementFD(group, elem);
            }
            else if (vr == DICOMElementFL.vrshort)
            {
                ret = new DICOMElementFL(group, elem);
            }
            else if (vr == DICOMElementIS.vrshort)
            {
                ret = new DICOMElementIS(group, elem);
            }
            else if (vr == DICOMElementLO.vrshort)
            {
                ret = new DICOMElementLO(group, elem);
            }
            else if (vr == DICOMElementLT.vrshort)
            {
                ret = new DICOMElementLT(group, elem);
            }
            else if (vr == DICOMElementOB.vrshort)
            {
                ret = new DICOMElementOB(group, elem);
            }
            else if (vr == DICOMElementOW.vrshort)
            {
                ret = new DICOMElementOW(group, elem);
            }
            else if (vr == DICOMElementPN.vrshort)
            {
                ret = new DICOMElementPN(group, elem);
            }
            else if (vr == DICOMElementSH.vrshort)
            {
                ret = new DICOMElementSH(group, elem);
            }
            else if (vr == DICOMElementSL.vrshort)
            {
                ret = new DICOMElementSL(group, elem);
            }
            else if (vr == DICOMElementSQ.vrshort)
            {
                ret = new DICOMElementSQ(group, elem);
            }
            else if (vr == DICOMElementSS.vrshort)
            {
                ret = new DICOMElementSS(group, elem);
            }
            else if (vr == DICOMElementST.vrshort)
            {
                ret = new DICOMElementST(group, elem);
            }
            else if (vr == DICOMElementTM.vrshort)
            {
                ret = new DICOMElementTM(group, elem);
            }
            else if (vr == DICOMElementUI.vrshort)
            {
                ret = new DICOMElementUI(group, elem);
            }
            else if (vr == DICOMElementUL.vrshort)
            {
                ret = new DICOMElementUL(group, elem);
            }
            else if (vr == DICOMElementUN.vrshort)
            {
                ret = new DICOMElementUN(group, elem);
            }
            else if (vr == DICOMElementUS.vrshort)
            {
                ret = new DICOMElementUS(group, elem);
            }
            else if (vr == DICOMElementUT.vrshort)
            {
                ret = new DICOMElementUT(group, elem);
            }
            else
            {
                ret = new DICOMElementOB(group, elem);     //fall back to OB
            }
            return(ret);
        }
Example #3
0
        //parseLen returns total bytes read
        internal static DICOMElement Parse(ushort group, ushort elem, ILogger logger, TransferSyntax transferSyntax, SwappableBinaryReader br, SQItem parentSQ, bool skipOverData, out uint parseLen)
        {
            ushort vr;
            uint   len;
            uint   headerBytes = 0;

            // Group 0 is always little-endian implicit vr, group 2 is always little-endian explicit vr
            if ((transferSyntax.ExplicitVR && group != 0) || group == 2)
            {
                vr           = br.ReadUInt16MSB();
                headerBytes += 2;

                if (vr == DICOMElementUT.vrshort || vr == DICOMElementUN.vrshort || vr == DICOMElementOB.vrshort ||
                    vr == DICOMElementOW.vrshort || vr == DICOMElementSQ.vrshort)
                {
                    //next 2 bytes reserved
                    br.ReadUInt16();
                    headerBytes += 2;

                    //len is next 4
                    len          = br.ReadUInt32();
                    headerBytes += 4;
                }
                else
                {
                    //len is next 2
                    len          = br.ReadUInt16();
                    headerBytes += 2;
                }
            }
            else
            {
                //Look up VR in the dictionary
                DataDictionaryElement dde = DataDictionary.LookupElement(group, elem);
                if (dde != null)
                {
                    //Found it.
                    vr = dde.vrshort;
                }
                else
                {
                    //No idea... OB!
                    vr = DICOMElementOB.vrshort;
                }

                //Length will always be 32-bit here
                len          = br.ReadUInt32();
                headerBytes += 4;
            }

            DICOMElement ret = null;

            //Is it a compressed weirdo image data sequence that's actually an SQ?
            if (len == 0xFFFFFFFF)
            {
                ret = new DICOMElementSQ(group, elem);
            }
            else
            {
                ret = CreateByVR(group, elem, vr);
            }

            ret.parentSQItem = parentSQ;

            //Parse internal Data
            parseLen = headerBytes;

            try
            {
                // Can't skip over the length if it's not explicit
                if (skipOverData && len != 0xFFFFFFFF)
                {
                    parseLen += len;
                    br.BaseStream.Seek(len, SeekOrigin.Current);
                }
                else
                {
                    parseLen += ret.ParseData(br, logger, len, transferSyntax);
                }
            }
            catch (Exception e)
            {
                logger.Log(LogLevel.Error, "Exception in ParseData(grp=" + group + ", elem=" + elem + ", len=" + len + "): " + e.ToString());
            }

            return(ret);
        }