/// <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>
/// 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 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>
/// This method helps read non-compliant files. Sometimes, an supposed implicit is encoded explicitly. We'll check here
/// Returns true if element is actually encoded explicitly (VR is written as starting characters).
/// </summary>
/// <param name="tag">the read tag</param>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <param name="vr">the determined VR from the tag</param>
/// <returns></returns>
private static bool CheckForExplicitness(Tag tag, DICOMBinaryReader dr, ref VR vr)
{
if (VRReader.PeekVR(dr) != VR.Null)
{
vr = VRReader.ReadVR(dr);
Logging.EvilLogger.Instance.Log($"{tag} was expectd to be implicit LE but is explicit LE. Attempting to read...");
return(true);
}
//Implicilty encoded - All is well
return(false);
}
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)
{
var tag = TagReader.ReadLittleEndian(dr);
var vr = VRReader.ReadVR(dr);
var 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);
}
}
