/// <summary>
/// Creates a new VR instance from a DICOM output stream.
/// </summary>
/// <param name="stream">
/// Any kind of DICOM output stream.
/// </param>
/// <returns>
/// Output stream position of this instance.
/// </returns>
public static ValueRepresentation LoadFrom(Stream stream, Tag tag)
{
DicomContext.Set(stream, tag);
if (IsImplicitBy(tag))
{
if (tag.IsUserDefined)
{
// implicit but unknown value representation
return(GetBy("UN", tag));
}
else
{
// implicit but known value representation;
// return new instance, dictionary entry do not have a
// transfer syntax
return(GetBy(tag.GetDictionaryEntry().VR.Name, tag));
}
}
else
{
// explicit value representation
byte[] buffer = new byte[2];
stream.Read(buffer, 0, 2);
string name = ByteConvert.ToString(buffer,
CharacterRepertoire.Default);
return(GetBy(name, tag));
}
DicomContext.Reset();
}
private void LoadFromBinary(StreamReader streamReader)
{
BinaryReader binaryReader = new BinaryReader(streamReader.BaseStream);
while (streamReader.BaseStream.Position < streamReader.BaseStream.Length)
{
try
{
int length = binaryReader.ReadInt32();
byte[] buffer = new byte[length];
binaryReader.Read(buffer, 0, length);
string stringUid = ByteConvert.ToString(buffer,
CharacterRepertoire.Ascii);
Uid uid = new Uid(stringUid);
length = binaryReader.ReadInt32();
buffer = new byte[length];
binaryReader.Read(buffer, 0, length);
string name = ByteConvert.ToString(buffer,
CharacterRepertoire.Ascii);
int intType = binaryReader.ReadInt32();
UidType type = (UidType)UidType.ToObject(typeof(UidType),
intType);
bool retired = binaryReader.ReadBoolean();
UidDictionaryEntry entry =
new UidDictionaryEntry(uid, name, type, retired);
Add(entry);
}
catch (Exception e)
{
throw new DicomException("Wrong entry before index " +
streamReader.BaseStream.Position + ": " + e.Message);
}
}
}
/// <summary>
/// Re-creates this instance from a DICOM output stream.
/// </summary>
public void LoadFrom(Stream stream)
{
streamPosition = stream.Position;
DicomContext.Set(stream, tag);
if (IsImplicit)
{
if (Tag.IsUserDefined)
{
// implicit but unknown value representation
vrName = "UN";
}
else
{
// implicit but known value representation;
// return new instance, dictionary entry do not have a
// transfer syntax
vrName = Tag.GetDictionaryEntry().VR.Name;
}
}
else
{
// explicit value representation
byte[] buffer = new byte[2];
stream.Read(buffer, 0, 2);
vrName = ByteConvert.ToString(buffer,
CharacterRepertoire.Default);
}
DicomContext.Reset();
}
private void LoadFromBinary(StreamReader streamReader)
{
BinaryReader binaryReader = new BinaryReader(streamReader.BaseStream);
while (streamReader.BaseStream.Position < streamReader.BaseStream.Length)
{
try
{
int group = binaryReader.ReadInt32();
int element = binaryReader.ReadInt32();
Tag tag = new Tag(group, element);
int length = binaryReader.ReadInt32();
byte[] buffer = new byte[length];
binaryReader.Read(buffer, 0, length);
string description = ByteConvert.ToString(buffer,
CharacterRepertoire.Ascii);
buffer = new byte[2];
binaryReader.Read(buffer, 0, 2);
string vr = ByteConvert.ToString(buffer,
CharacterRepertoire.Ascii);
vr = vr.Trim();
length = binaryReader.ReadInt32();
buffer = new byte[length];
binaryReader.Read(buffer, 0, length);
string vm = ByteConvert.ToString(buffer,
CharacterRepertoire.Ascii);
bool retiredBool = binaryReader.ReadBoolean();
string retired = retiredBool ? "RET" : null;
DataElementDictionaryEntry entry =
new DataElementDictionaryEntry(tag.ToString(),
description, vr, vm, retired);
Add(entry);
}
catch (Exception e)
{
throw new DicomException("Wrong entry before index " +
streamReader.BaseStream.Position + ": " + e.Message);
}
}
}