private void ReadTagVRLength()
{
if (CurrentTag != DicomTag.Undefined)
{
throw new InvalidOperationException($"Reading of {CurrentTag} not completed");
}
CurrentTag = DicomTag.ReadFrom(DataReader);
if (CurrentTag.GroupNumber == 0xFFFF)
{
throw new IOException($"Invalid DICOM tag {CurrentTag} in input"); // See part 5, section 7.5.1 Item Encoding Rules
}
if (CurrentTag.HasVR && (VRCoding == DicomVRCoding.Explicit))
{
DataReader.Read(out byte b0);
DataReader.Read(out byte b1);
var id = new ValueTuple <byte, byte>(b0, b1);
ExplicitVR = DicomVR.Lookup(id);
if (ExplicitVR is IHas16BitExplicitVRLength)
{
ValueLength = DataReader.Read <UInt16>();
}
else
{
Input.SkipBytes(2);
ValueLength = DataReader.Read <UInt32>();
}
}
else
{
ValueLength = DataReader.Read <UInt32>();
if (CurrentTag.IsDelimitationItem && (ValueLength != 0))
{
throw new IOException($"Expected 0 length for {CurrentTag} but got {ValueLength}");
}
}
}
/// <summary>Maps a property to a DICOM attribute</summary>
public DicomAttributeAttribute(ushort groupNumber, ushort elementNumber, string vr)
{
Tag = new DicomTag(groupNumber, elementNumber);
VR = DicomVR.Lookup(vr);
}