public static Dictionary <uint, Element> ReadFile(BinaryReader reader)
{
var state = new ReaderState()
{
UseImplicitVr = false,
IsImplicitVr = false,
Reader = reader,
};
reader.ReadBytes(128);
var magicBytes = reader.ReadChars(4);
var magicText = new string(magicBytes);
if (magicText != "DICM")
{
Logger.Error("Fileformat not recognized!");
return(new Dictionary <uint, Element>());
}
var dicomData = new Dictionary <uint, Element>();
while (reader.BaseStream.Position < reader.BaseStream.Length)
{
var groupId = reader.ReadUInt16();
var elementId = reader.ReadUInt16();
var combinedId = ElementTag.GetCombinedId(groupId, elementId);
Logger.Debug("(0x{0:x4}, 0x{1:x4})", groupId, elementId);
var element = ReadElement(state, groupId, elementId);
if (element.Tag != null && element.Tag.VR != ValueTypes.Separator)
{
dicomData.Add(combinedId, element);
}
}
return(dicomData);
}
private static Element ReadElement(ReaderState state, ushort groupId, ushort elementId)
{
var combinedId = ElementTag.GetCombinedId(groupId, elementId);
state.IsImplicitVr = state.UseImplicitVr && (groupId != 0x0002);
if (!state.IsImplicitVr && groupId != 0xfffe) // Sequence items are always implicit - hence 0xfffe.
{
state.ExplicitVr = new string(state.Reader.ReadChars(2));
}
// Always use Implicit VR if the tag is recognized in the dictionary.
var vr = ValueTypes.Unknown;
if (Dictionary.ContainsKey(combinedId))
{
var elementTag = Dictionary[combinedId];
vr = elementTag.VR;
Logger.Debug(elementTag.Name);
}
var value = new Value[0];
switch (vr)
{
case ValueTypes.String:
value = ReadString(state);
break;
case ValueTypes.DoubleString:
value = ReadDoubleString(state);
break;
case ValueTypes.UShort:
value = ReadUShort(state);
break;
case ValueTypes.Bytes:
value = ReadBytes(state);
break;
case ValueTypes.Item:
value = ReadItem(state);
break;
case ValueTypes.Separator:
value = ReadSeparator(state);
break;
default:
ReadUnknown(state);
break;
}
// TransferSyntaxUID - See if implicit is specified. We hate implicit because shit cannot always be understood!
state.UseImplicitVr = (combinedId == ReverseDictionary["TransferSyntaxUID"]) && (value[0].Text == "1.2.840.10008.1.2");
var tag = Dictionary.ContainsKey(combinedId) ? Dictionary[combinedId] : null;
return(new Element()
{
GroupId = groupId,
ElementId = elementId,
Value = value,
Tag = tag
});
}
