/// <summary>
/// Reads and returns the next DICOM element starting at the current location in the DICOM binary reader
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <returns>the next DICOM element</returns>
public static IDICOMElement ReadElementExplicitLittleEndian(DICOMBinaryReader dr, StringEncoding enc = StringEncoding.ISO_IR_192)
{
var tag = TagReader.ReadLittleEndian(dr);
var vr = VRReader.ReadVR(dr);
return(ReadElementExplicitLittleEndian(tag, vr, dr, enc));
}
/// <summary>
/// Reads and returns the next DICOM element starting at the current location in the DICOM binary reader
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <returns>the next DICOM element</returns>
public static IDICOMElement ReadElementExplicitLittleEndian(DICOMBinaryReader dr)
{
Tag tag = TagReader.ReadLittleEndian(dr);
VR vr = VRReader.ReadVR(dr);
return(ReadElementExplicitLittleEndian(tag, vr, dr));
}
/// <summary>
/// Read explicit VR little endian up to transfer syntax element and determines transfer syntax for rest of elements
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <param name="syntax">the transfer syntax of the DICOM file</param>
/// <returns>elements preceeding and including transfer syntax element</returns>
public static List <IDICOMElement> ReadFileMetadata(DICOMBinaryReader dr, ref TransferSyntax syntax)
{
var elements = new List <IDICOMElement>();
syntax = syntax != TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN
? syntax
: TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN;
while (dr.StreamPosition < dr.StreamLength)
{
long position = dr.StreamPosition;
if (TagReader.ReadLittleEndian(dr).Group == _metaGroup)
{
dr.StreamPosition = position;
IDICOMElement el = DICOMElementReader.ReadElementExplicitLittleEndian(dr);
Tag uid = TagHelper.TRANSFER_SYNTAX_UID;
if (el.Tag == uid)
{
syntax = TransferSyntaxHelper.GetSyntax(el);
}
elements.Add(el);
}
else
{
dr.StreamPosition = position;
break;
}
}
return(elements);
}
/// <summary>
/// Read explicit VR little endian up to transfer syntax element and determines transfer syntax for rest of elements
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <param name="syntax">the transfer syntax of the DICOM file</param>
/// <returns>elements preceeding and including transfer syntax element</returns>
private static List <IDICOMElement> ReadFileMetadata(DICOMBinaryReader dr, out TransferSyntax syntax)
{
List <IDICOMElement> elements = new List <IDICOMElement>();
syntax = TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN;
while (dr.StreamPosition < dr.StreamLength)
{
long position = dr.StreamPosition;
if (TagReader.ReadLittleEndian(dr).Group == _MetaGroup)
{
dr.StreamPosition = position;
IDICOMElement el = DICOMElementReader.ReadElementExplicitLittleEndian(dr);
if (el.Tag.CompleteID == TagHelper.TRANSFER_SYNTAX_UID.CompleteID)
{
syntax = TransferSyntaxHelper.GetSyntax(el);
}
elements.Add(el);
}
else
{
dr.StreamPosition = position;
break;
}
}
return(elements);
}
/// <summary>
/// Read explicit VR little endian up to transfer syntax element and determines transfer syntax for rest of elements
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <param name="syntax">the transfer syntax of the DICOM file</param>
/// <returns>elements preceeding and including transfer syntax element</returns>
public static List <IDICOMElement> ReadFileMetadata(DICOMBinaryReader dr, ref TransferSyntax syntax, ref StringEncoding enc)
{
var elements = new List <IDICOMElement>();
while (dr.StreamPosition < dr.StreamLength)
{
var position = dr.StreamPosition;
if (TagReader.ReadLittleEndian(dr).Group == _metaGroup)
{
dr.StreamPosition = position;
var el = DICOMElementReader.ReadElementExplicitLittleEndian(dr, enc);
if (el.Tag == TagHelper.TransferSyntaxUID)
{
syntax = TransferSyntaxHelper.GetSyntax(el);
}
elements.Add(el);
}
else
{
dr.StreamPosition = position;
break;
}
}
return(elements);
}
/// <summary>
/// Reads and returns the next DICOM element starting at the current location in the DICOM binary reader
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <returns>the next DICOM element</returns>
public static IDICOMElement ReadElementExplicitBigEndian(DICOMBinaryReader dr, StringEncoding enc)
{
var tag = TagReader.ReadBigEndian(dr);
var vr = VRReader.ReadVR(dr);
var length = LengthReader.ReadBigEndian(vr, dr);
var data = DataReader.ReadBigEndian(length, dr);
return(ElementFactory.GenerateElement(tag, vr, data, TransferSyntax.EXPLICIT_VR_BIG_ENDIAN, enc));
}
/// <summary>
/// Reads and returns the next DICOM element starting at the current location in the DICOM binary reader
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <returns>the next DICOM element</returns>
public static IDICOMElement ReadElementExplicitBigEndian(DICOMBinaryReader dr)
{
Tag tag = TagReader.ReadBigEndian(dr);
VR vr = VRReader.ReadVR(dr);
int length = LengthReader.ReadBigEndian(vr, dr);
byte[] data = DataReader.ReadBigEndian(length, dr);
return(ElementFactory.GenerateElement(tag, vr, data, TransferSyntax.EXPLICIT_VR_BIG_ENDIAN));
}
/// <summary>
/// Reads and returns the next DICOM element starting at the current location in the DICOM binary reader
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <returns>the next DICOM element</returns>
public static IDICOMElement ReadElementExplicitLittleEndian(DICOMBinaryReader dr)
{
var tag = TagReader.ReadLittleEndian(dr);
var vr = VRReader.Read(dr);
int length = LengthReader.ReadLittleEndian(vr, dr);
var data = DataReader.ReadLittleEndian(length, dr, TransferSyntax.EXPLICIT_VR_LITTLE_ENDIAN);
return(ElementFactory.GenerateElement(tag, vr, data, TransferSyntax.EXPLICIT_VR_LITTLE_ENDIAN));
}
/// <summary>
/// Reads and returns the next DICOM element starting at the current location in the DICOM binary reader
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <returns>the next DICOM element</returns>
public static IDICOMElement ReadElementImplicitLittleEndian(DICOMBinaryReader dr)
{
var tag = TagReader.ReadLittleEndian(dr);
var vr = TagDictionary.GetVRFromTag(tag);
int length = LengthReader.ReadLittleEndian(VR.Null, dr);
var data = DataReader.ReadLittleEndian(length, dr, TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN);
var el = ElementFactory.GenerateElement(tag, vr, data, TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN);
return(el);
}
public static void SkipElementImplicitLittleEndian(DICOMBinaryReader dr)
{
var tag = TagReader.ReadLittleEndian(dr);
var length = LengthReader.ReadLittleEndian(VR.Null, dr);
if (length != -1)
{
dr.Skip(length);
}
else
{
dr.Skip(SequenceReader.ReadIndefiniteLengthLittleEndian(dr, TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN));
dr.Skip(8);
}
}
public static void SkipElementExplicitBigEndian(DICOMBinaryReader dr)
{
var tag = TagReader.ReadBigEndian(dr);
var vr = VRReader.ReadVR(dr);
var length = LengthReader.ReadBigEndian(vr, dr);
if (length != -1)
{
dr.Skip(length);
}
else
{
dr.Skip(SequenceReader.ReadIndefiniteLengthBigEndian(dr));
dr.Skip(8);
}
}
public static void SkipElementExplicitLittleEndian(DICOMBinaryReader dr)
{
Tag tag = TagReader.ReadLittleEndian(dr);
VR vr = VRReader.ReadVR(dr);
int length = LengthReader.ReadLittleEndian(vr, dr);
if (length != -1)
{
dr.Skip(length);
}
else
{
dr.Skip(SequenceReader.ReadIndefiniteLengthLittleEndian(dr, TransferSyntax.EXPLICIT_VR_LITTLE_ENDIAN));
dr.Skip(8);
}
}
/// <summary>
/// Reads and returns the next DICOM element starting at the current location in the DICOM binary reader
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <returns>the next DICOM element</returns>
public static IDICOMElement ReadElementImplicitLittleEndian(DICOMBinaryReader dr)
{
Tag tag = TagReader.ReadLittleEndian(dr);
VR vr = TagDictionary.GetVRFromTag(tag);
if (CheckForExplicitness(tag, dr, ref vr))
{
return(ReadElementExplicitLittleEndian(tag, vr, dr));
}
else
{
int length = LengthReader.ReadLittleEndian(VR.Null, dr);
byte[] data = DataReader.ReadLittleEndian(length, dr, TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN);
IDICOMElement el = ElementFactory.GenerateElement(tag, vr, data, TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN);
return(el);
}
}
