public void TestSequenceImplicitVr2()
{
var syntax = TransferSyntax.ImplicitVrLittleEndian;
var sq = new DicomAttributeSQ(DicomTags.IconImageSequence);
var item1 = new DicomSequenceItem();
item1[DicomTags.AccessionNumber].SetStringValue("ABCDEFG");
sq.AddSequenceItem(item1);
var item2 = new DicomSequenceItem();
item2[DicomTags.AccessionNumber].SetStringValue("XYZ");
sq.AddSequenceItem(item2);
// note: both sequence and item delimiter tags are calculated as part of the sequence - the item considers only the total length of its contents
// item1_length = contents(16)
Assert.AreEqual(16, item1[DicomTags.AccessionNumber].CalculateWriteLength(syntax, DicomWriteOptions.None), "Attr1 Length");
Assert.AreEqual(16, item1.CalculateWriteLength(syntax, DicomWriteOptions.None), "Item1 Length");
// item2_length = contents(12)
Assert.AreEqual(12, item2[DicomTags.AccessionNumber].CalculateWriteLength(syntax, DicomWriteOptions.None), "Attr2 Length");
Assert.AreEqual(12, item2.CalculateWriteLength(syntax, DicomWriteOptions.None), "Item2 Length");
// sq_length = tag(4) + len(4) + item_tag(4) + item_len(4) + item1_length(16) + item_delimiter_tag(4) + item_delimiter_len(4)
// + item_tag(4) + item_len(4) + item2_length(12) + item_delimiter_tag(4) + item_delimiter_len(4)
// + sq_delimiter_tag(4) + sq_delimiter_len(4)
var options = DicomWriteOptions.None;
Assert.AreEqual(76, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4) + item_tag(4) + item_len(4) + item1_length(16) + item_delimiter_tag(4) + item_delimiter_len(4)
// + item_tag(4) + item_len(4) + item2_length(12) + item_delimiter_tag(4) + item_delimiter_len(4)
options = DicomWriteOptions.ExplicitLengthSequence;
Assert.AreEqual(68, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4) + item_tag(4) + item_len(4) + item1_length(16)
// + item_tag(4) + item_len(4) + item2_length(12)
// + sq_delimiter_tag(4) + sq_delimiter_len(4)
options = DicomWriteOptions.ExplicitLengthSequenceItem;
Assert.AreEqual(60, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4) + item_tag(4) + item_len(4) + item1_length(16)
// + item_tag(4) + item_len(4) + item2_length(12)
options = DicomWriteOptions.ExplicitLengthSequence | DicomWriteOptions.ExplicitLengthSequenceItem;
Assert.AreEqual(52, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
}
public void TestSequenceImplicitVr()
{
var syntax = TransferSyntax.ImplicitVrLittleEndian;
var sq = new DicomAttributeSQ(DicomTags.IconImageSequence);
// note: we handle an empty sequence (0 items) by explicitly encoding zero length regardless of options
// sq_length = tag(4) + len(4)
var options = DicomWriteOptions.None;
Assert.AreEqual(8, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4)
options = DicomWriteOptions.ExplicitLengthSequence;
Assert.AreEqual(8, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4)
options = DicomWriteOptions.ExplicitLengthSequenceItem;
Assert.AreEqual(8, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4)
options = DicomWriteOptions.ExplicitLengthSequence | DicomWriteOptions.ExplicitLengthSequenceItem;
Assert.AreEqual(8, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
}
public void TestSequenceImplicitVr()
{
var syntax = TransferSyntax.ImplicitVrLittleEndian;
var sq = new DicomAttributeSQ(DicomTags.IconImageSequence);
// note: we handle an empty sequence (0 items) by explicitly encoding zero length regardless of options
// sq_length = tag(4) + len(4)
var options = DicomWriteOptions.None;
Assert.AreEqual(8, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4)
options = DicomWriteOptions.ExplicitLengthSequence;
Assert.AreEqual(8, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4)
options = DicomWriteOptions.ExplicitLengthSequenceItem;
Assert.AreEqual(8, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4)
options = DicomWriteOptions.ExplicitLengthSequence | DicomWriteOptions.ExplicitLengthSequenceItem;
Assert.AreEqual(8, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
}
public DicomWriteStatus Write(TransferSyntax syntax, DicomAttributeCollection dataset, DicomWriteOptions options)
{
TransferSyntax = syntax;
foreach (DicomAttribute item in dataset)
{
if (item.Tag.Element == 0x0000)
{
continue;
}
if (item.IsEmpty)
{
continue;
}
if (Flags.IsSet(options, DicomWriteOptions.CalculateGroupLengths) &&
item.Tag.Group != _group && item.Tag.Group <= 0x7fe0)
{
_group = item.Tag.Group;
_writer.Write((ushort)_group);
_writer.Write((ushort)0x0000);
if (_syntax.ExplicitVr)
{
_writer.Write((byte)'U');
_writer.Write((byte)'L');
_writer.Write((ushort)4);
}
else
{
_writer.Write((uint)4);
}
_writer.Write((uint)dataset.CalculateGroupWriteLength(_group, _syntax, options));
}
_writer.Write((ushort)item.Tag.Group);
_writer.Write((ushort)item.Tag.Element);
if (_syntax.ExplicitVr)
{
_writer.Write((byte)item.Tag.VR.Name[0]);
_writer.Write((byte)item.Tag.VR.Name[1]);
}
if (item is DicomAttributeSQ)
{
DicomAttributeSQ sq = item as DicomAttributeSQ;
if (_syntax.ExplicitVr)
{
_writer.Write((ushort)0x0000);
}
if (Flags.IsSet(options, DicomWriteOptions.ExplicitLengthSequence))
{
int hl = _syntax.ExplicitVr ? 12 : 8;
_writer.Write((uint)sq.CalculateWriteLength(_syntax, options & ~DicomWriteOptions.CalculateGroupLengths) - (uint)hl);
}
else
{
_writer.Write((uint)UndefinedLength);
}
foreach (DicomSequenceItem ids in item.Values as DicomSequenceItem[])
{
_writer.Write((ushort)DicomTag.Item.Group);
_writer.Write((ushort)DicomTag.Item.Element);
if (Flags.IsSet(options, DicomWriteOptions.ExplicitLengthSequenceItem))
{
_writer.Write((uint)ids.CalculateWriteLength(_syntax, options & ~DicomWriteOptions.CalculateGroupLengths));
}
else
{
_writer.Write((uint)UndefinedLength);
}
Write(this.TransferSyntax, ids, options & ~DicomWriteOptions.CalculateGroupLengths);
if (!Flags.IsSet(options, DicomWriteOptions.ExplicitLengthSequenceItem))
{
_writer.Write((ushort)DicomTag.ItemDelimitationItem.Group);
_writer.Write((ushort)DicomTag.ItemDelimitationItem.Element);
_writer.Write((uint)0x00000000);
}
}
if (!Flags.IsSet(options, DicomWriteOptions.ExplicitLengthSequence))
{
_writer.Write((ushort)DicomTag.SequenceDelimitationItem.Group);
_writer.Write((ushort)DicomTag.SequenceDelimitationItem.Element);
_writer.Write((uint)0x00000000);
}
}
else if (item is DicomFragmentSequence)
{
DicomFragmentSequence fs = item as DicomFragmentSequence;
if (_syntax.ExplicitVr)
{
_writer.Write((ushort)0x0000);
}
_writer.Write((uint)UndefinedLength);
_writer.Write((ushort)DicomTag.Item.Group);
_writer.Write((ushort)DicomTag.Item.Element);
if (Flags.IsSet(options, DicomWriteOptions.WriteFragmentOffsetTable) && fs.HasOffsetTable)
{
_writer.Write((uint)fs.OffsetTableBuffer.Length);
fs.OffsetTableBuffer.CopyTo(_writer);
}
else
{
_writer.Write((uint)0x00000000);
}
foreach (DicomFragment bb in fs.Fragments)
{
_writer.Write((ushort)DicomTag.Item.Group);
_writer.Write((ushort)DicomTag.Item.Element);
_writer.Write((uint)bb.Length);
bb.GetByteBuffer(_syntax).CopyTo(_writer);
}
_writer.Write((ushort)DicomTag.SequenceDelimitationItem.Group);
_writer.Write((ushort)DicomTag.SequenceDelimitationItem.Element);
_writer.Write((uint)0x00000000);
}
else
{
DicomAttribute de = item;
ByteBuffer theData = de.GetByteBuffer(_syntax, dataset.SpecificCharacterSet);
if (_syntax.ExplicitVr)
{
if (de.Tag.VR.Is16BitLengthField)
{
_writer.Write((ushort)theData.Length);
}
else
{
_writer.Write((ushort)0x0000);
_writer.Write((uint)theData.Length);
}
}
else
{
_writer.Write((uint)theData.Length);
}
if (theData.Length > 0)
{
theData.CopyTo(_writer);
}
}
}
return(DicomWriteStatus.Success);
}
public void TestSequenceImplicitVr2()
{
var syntax = TransferSyntax.ImplicitVrLittleEndian;
var sq = new DicomAttributeSQ(DicomTags.IconImageSequence);
var item1 = new DicomSequenceItem();
item1[DicomTags.AccessionNumber].SetStringValue("ABCDEFG");
sq.AddSequenceItem(item1);
var item2 = new DicomSequenceItem();
item2[DicomTags.AccessionNumber].SetStringValue("XYZ");
sq.AddSequenceItem(item2);
// note: both sequence and item delimiter tags are calculated as part of the sequence - the item considers only the total length of its contents
// item1_length = contents(16)
Assert.AreEqual(16, item1[DicomTags.AccessionNumber].CalculateWriteLength(syntax, DicomWriteOptions.None), "Attr1 Length");
Assert.AreEqual(16, item1.CalculateWriteLength(syntax, DicomWriteOptions.None), "Item1 Length");
// item2_length = contents(12)
Assert.AreEqual(12, item2[DicomTags.AccessionNumber].CalculateWriteLength(syntax, DicomWriteOptions.None), "Attr2 Length");
Assert.AreEqual(12, item2.CalculateWriteLength(syntax, DicomWriteOptions.None), "Item2 Length");
// sq_length = tag(4) + len(4) + item_tag(4) + item_len(4) + item1_length(16) + item_delimiter_tag(4) + item_delimiter_len(4)
// + item_tag(4) + item_len(4) + item2_length(12) + item_delimiter_tag(4) + item_delimiter_len(4)
// + sq_delimiter_tag(4) + sq_delimiter_len(4)
var options = DicomWriteOptions.None;
Assert.AreEqual(76, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4) + item_tag(4) + item_len(4) + item1_length(16) + item_delimiter_tag(4) + item_delimiter_len(4)
// + item_tag(4) + item_len(4) + item2_length(12) + item_delimiter_tag(4) + item_delimiter_len(4)
options = DicomWriteOptions.ExplicitLengthSequence;
Assert.AreEqual(68, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4) + item_tag(4) + item_len(4) + item1_length(16)
// + item_tag(4) + item_len(4) + item2_length(12)
// + sq_delimiter_tag(4) + sq_delimiter_len(4)
options = DicomWriteOptions.ExplicitLengthSequenceItem;
Assert.AreEqual(60, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
// sq_length = tag(4) + len(4) + item_tag(4) + item_len(4) + item1_length(16)
// + item_tag(4) + item_len(4) + item2_length(12)
options = DicomWriteOptions.ExplicitLengthSequence | DicomWriteOptions.ExplicitLengthSequenceItem;
Assert.AreEqual(52, sq.CalculateWriteLength(syntax, options), "SQ Length (Options={0})", options);
}
public DicomWriteStatus Write(TransferSyntax syntax, DicomAttributeCollection dataset, DicomWriteOptions options)
{
TransferSyntax = syntax;
foreach (DicomAttribute item in dataset)
{
if (item.Tag.Element == 0x0000)
{
continue;
}
if (item.IsEmpty)
{
continue;
}
if (Flags.IsSet(options, DicomWriteOptions.CalculateGroupLengths) &&
item.Tag.Group != _group && item.Tag.Group <= 0x7fe0)
{
_group = item.Tag.Group;
_writer.Write((ushort)_group);
_writer.Write((ushort)0x0000);
if (_syntax.ExplicitVr)
{
_writer.Write((byte)'U');
_writer.Write((byte)'L');
_writer.Write((ushort)4);
}
else
{
_writer.Write((uint)4);
}
_writer.Write((uint)dataset.CalculateGroupWriteLength(_group, _syntax, options));
}
_writer.Write((ushort)item.Tag.Group);
_writer.Write((ushort)item.Tag.Element);
if (_syntax.ExplicitVr)
{
_writer.Write((byte)item.Tag.VR.Name[0]);
_writer.Write((byte)item.Tag.VR.Name[1]);
}
if (item is DicomAttributeSQ)
{
DicomAttributeSQ sq = item as DicomAttributeSQ;
if (_syntax.ExplicitVr)
{
_writer.Write((ushort)0x0000);
}
if (Flags.IsSet(options, DicomWriteOptions.ExplicitLengthSequence))
{
int hl = _syntax.ExplicitVr ? 12 : 8;
_writer.Write((uint)sq.CalculateWriteLength(_syntax, options & ~DicomWriteOptions.CalculateGroupLengths) - (uint)hl);
}
else
{
_writer.Write((uint)UndefinedLength);
}
foreach (DicomSequenceItem ids in item.Values as DicomSequenceItem[])
{
_writer.Write((ushort)DicomTag.Item.Group);
_writer.Write((ushort)DicomTag.Item.Element);
if (Flags.IsSet(options, DicomWriteOptions.ExplicitLengthSequenceItem))
{
_writer.Write((uint)ids.CalculateWriteLength(_syntax, options & ~DicomWriteOptions.CalculateGroupLengths));
}
else
{
_writer.Write((uint)UndefinedLength);
}
Write(this.TransferSyntax, ids, options & ~DicomWriteOptions.CalculateGroupLengths);
if (!Flags.IsSet(options, DicomWriteOptions.ExplicitLengthSequenceItem))
{
_writer.Write((ushort)DicomTag.ItemDelimitationItem.Group);
_writer.Write((ushort)DicomTag.ItemDelimitationItem.Element);
_writer.Write((uint)0x00000000);
}
}
if (!Flags.IsSet(options, DicomWriteOptions.ExplicitLengthSequence))
{
_writer.Write((ushort)DicomTag.SequenceDelimitationItem.Group);
_writer.Write((ushort)DicomTag.SequenceDelimitationItem.Element);
_writer.Write((uint)0x00000000);
}
}
else if (item is DicomFragmentSequence)
{
DicomFragmentSequence fs = item as DicomFragmentSequence;
if (_syntax.ExplicitVr)
{
_writer.Write((ushort)0x0000);
}
_writer.Write((uint)UndefinedLength);
_writer.Write((ushort)DicomTag.Item.Group);
_writer.Write((ushort)DicomTag.Item.Element);
if (Flags.IsSet(options, DicomWriteOptions.WriteFragmentOffsetTable) && fs.HasOffsetTable)
{
_writer.Write((uint)fs.OffsetTableBuffer.Length);
fs.OffsetTableBuffer.CopyTo(_writer);
}
else
{
_writer.Write((uint)0x00000000);
}
foreach (DicomFragment bb in fs.Fragments)
{
_writer.Write((ushort)DicomTag.Item.Group);
_writer.Write((ushort)DicomTag.Item.Element);
_writer.Write((uint)bb.Length);
bb.GetByteBuffer(_syntax).CopyTo(_writer);
}
_writer.Write((ushort)DicomTag.SequenceDelimitationItem.Group);
_writer.Write((ushort)DicomTag.SequenceDelimitationItem.Element);
_writer.Write((uint)0x00000000);
}
else
{
DicomAttribute de = item;
ByteBuffer theData = de.GetByteBuffer(_syntax, dataset.SpecificCharacterSet);
if (_syntax.ExplicitVr)
{
if (de.Tag.VR.Is16BitLengthField)
{
// #10890: Can't encode the value length if the length of the data exceeds max value for a 16-bit field
if (theData.Length > ushort.MaxValue - 1 /* must be even length so max allowed = 65534 */)
{
throw new DicomDataException(string.Format(
"Value for {0} exceeds maximum stream length allowed for a {1} VR attribute encoded using {2}",
de.Tag, de.Tag.VR, _syntax));
}
_writer.Write((ushort)theData.Length);
}
else
{
_writer.Write((ushort)0x0000);
_writer.Write((uint)theData.Length);
}
}
else
{
_writer.Write((uint)theData.Length);
}
if (theData.Length > 0)
{
theData.CopyTo(_writer);
}
}
}
return(DicomWriteStatus.Success);
}