/// <summary>
/// Load a DICOM file from an input stream.
/// </summary>
/// <remarks>
/// Note: If the file does not contain DICM encoded in it, and
/// <see cref="Stream.CanSeek"/> is true for <paramref name="iStream"/>,
/// the routine will assume the file is not a Part 10 format file, and is
/// instead encoded as just a DataSet with the transfer syntax set to
/// Implicit VR Little Endian.
/// </remarks>
/// <param name="iStream">The input stream to read from.</param>
/// <param name="stopTag">The dicom tag to stop the reading at.</param>
/// <param name="options">The dicom read options to consider.</param>
public void Load(Stream iStream, DicomTag stopTag, DicomReadOptions options)
{
if (iStream == null)
{
throw new ArgumentNullException("iStream");
}
if (stopTag == null)
{
stopTag = new DicomTag(0xFFFFFFFF, "Bogus Tag", "BogusTag", DicomVr.NONE, false, 1, 1, false);
}
DicomStreamReader dsr;
if (iStream.CanSeek)
{
iStream.Seek(128, SeekOrigin.Begin);
if (!FileHasPart10Header(iStream))
{
if (!Flags.IsSet(options, DicomReadOptions.ReadNonPart10Files))
{
throw new DicomException(String.Format("File is not part 10 format file: {0}", Filename));
}
iStream.Seek(0, SeekOrigin.Begin);
dsr = new DicomStreamReader(iStream)
{
Filename = Filename,
TransferSyntax = TransferSyntax.ImplicitVrLittleEndian,
Dataset = DataSet
};
DicomReadStatus stat = dsr.Read(stopTag, options);
if (stat != DicomReadStatus.Success)
{
Platform.Log(LogLevel.Error, "Unexpected error when reading file: {0}", Filename);
throw new DicomException("Unexpected read error with file: " + Filename);
}
TransferSyntax = TransferSyntax.ImplicitVrLittleEndian;
if (DataSet.Contains(DicomTags.SopClassUid))
{
MediaStorageSopClassUid = DataSet[DicomTags.SopClassUid].ToString();
}
if (DataSet.Contains(DicomTags.SopInstanceUid))
{
MediaStorageSopInstanceUid = DataSet[DicomTags.SopInstanceUid].ToString();
}
return;
}
}
else
{
// Read the 128 byte header first, then check for DICM
iStream.Read(new byte[128], 0, 128);
if (!FileHasPart10Header(iStream))
{
Platform.Log(LogLevel.Error, "Reading DICOM file from stream, file does not have part 10 format header.");
throw new DicomException("File being read from stream is not a part 10 format file");
}
}
dsr = new DicomStreamReader(iStream)
{
TransferSyntax = TransferSyntax.ExplicitVrLittleEndian,
Filename = Filename,
Dataset = MetaInfo
};
DicomReadStatus readStat =
dsr.Read(new DicomTag(0x0002FFFF, "Bogus Tag", "BogusTag", DicomVr.UNvr, false, 1, 1, false), options);
if (readStat != DicomReadStatus.Success)
{
Platform.Log(LogLevel.Error, "Unexpected error when reading file Meta info for file: {0}", Filename);
throw new DicomException("Unexpected failure reading file Meta info for file: " + Filename);
}
MetaInfoFileLength = dsr.EndGroupTwo + 128 + 4;
dsr.Dataset = DataSet;
dsr.TransferSyntax = TransferSyntax;
readStat = dsr.Read(stopTag, options);
if (readStat != DicomReadStatus.Success)
{
Platform.Log(LogLevel.Error, "Unexpected error ({0}) when reading file at offset {2}: {1}", readStat, Filename, dsr.BytesRead);
throw new DicomException("Unexpected failure (" + readStat + ") reading file at offset " + dsr.BytesRead + ": " + Filename);
}
Loaded = true;
}
/// <summary>
/// Method for dumping the contents of the attribute to a string.
/// </summary>
/// <param name="sb">The StringBuilder to write the attribute to.</param>
/// <param name="prefix">A prefix to place before the value.</param>
/// <param name="options">The <see cref="DicomDumpOptions"/> to use for the output string.</param>
public virtual void Dump(StringBuilder sb, string prefix, DicomDumpOptions options)
{
int ValueWidth = 40 - prefix.Length;
int SbLength = sb.Length;
sb.Append(prefix);
sb.AppendFormat("({0:x4},{1:x4}) {2} ", Tag.Group, Tag.Element, Tag.VR.Name);
if (Count == 0)
{
String value = "(no value available)";
sb.Append(value.PadRight(ValueWidth, ' '));
}
else
{
if (Tag.VR.IsTextVR)
{
String value;
if (Tag.VR == DicomVr.UIvr)
{
DicomAttributeUI ui = this as DicomAttributeUI;
DicomUid uid;
bool ok = ui.TryGetUid(0, out uid);
if (ok && uid.Type != UidType.Unknown)
{
value = "=" + uid.Description;
if (Flags.IsSet(options, DicomDumpOptions.ShortenLongValues))
{
if (value.Length > ValueWidth)
{
value = value.Substring(0, ValueWidth - 3);
}
}
}
else
{
value = "[" + ToString() + "]";
if (Flags.IsSet(options, DicomDumpOptions.ShortenLongValues))
{
if (value.Length > ValueWidth)
{
value = value.Substring(0, ValueWidth - 4) + "...]";
}
}
}
}
else
{
value = "[" + ToString() + "]";
if (Flags.IsSet(options, DicomDumpOptions.ShortenLongValues))
{
if (value.Length > ValueWidth)
{
value = value.Substring(0, ValueWidth - 4) + "...]";
}
}
}
sb.Append(value.PadRight(ValueWidth, ' '));
}
else
{
String value = ToString();
if (Flags.IsSet(options, DicomDumpOptions.ShortenLongValues))
{
if (value.Length > ValueWidth)
{
value = value.Substring(0, ValueWidth - 3) + "...";
}
}
sb.Append(value.PadRight(ValueWidth, ' '));
}
}
sb.AppendFormat(" # {0,4} {2} {1}", StreamLength, Tag.VM, Tag.Name.Replace("'", "'"));
if (Flags.IsSet(options, DicomDumpOptions.Restrict80CharactersPerLine))
{
if (sb.Length > (SbLength + 79))
{
sb.Length = SbLength + 79;
//sb.Append(">");
}
}
}
private void LoadCore(Stream stream, DicomStreamOpener streamOpener, DicomTag stopTag, DicomReadOptions options)
{
// TODO CR (24 Jan 2014): DICOM stream read only uses tag value, so the real implementation should be the uint overload!
if (stopTag == null)
{
stopTag = new DicomTag(0xFFFFFFFF, "Bogus Tag", "BogusTag", DicomVr.NONE, false, 1, 1, false);
}
DicomStreamReader dsr;
var iStream = stream ?? streamOpener.Open();
if (iStream.CanSeek)
{
iStream.Seek(128, SeekOrigin.Begin);
if (!FileHasPart10Header(iStream))
{
if (!Flags.IsSet(options, DicomReadOptions.ReadNonPart10Files))
{
throw new DicomException(String.Format("File is not part 10 format file: {0}", Filename));
}
iStream.Seek(0, SeekOrigin.Begin);
dsr = new DicomStreamReader(iStream)
{
StreamOpener = streamOpener,
TransferSyntax = TransferSyntax.ImplicitVrLittleEndian,
Dataset = DataSet
};
DicomReadStatus stat = dsr.Read(stopTag, options);
if (stat != DicomReadStatus.Success)
{
Platform.Log(LogLevel.Error, "Unexpected error when reading file: {0}", Filename);
throw new DicomException("Unexpected read error with file: " + Filename);
}
TransferSyntax = TransferSyntax.ImplicitVrLittleEndian;
if (DataSet.Contains(DicomTags.SopClassUid))
{
MediaStorageSopClassUid = DataSet[DicomTags.SopClassUid].ToString();
}
if (DataSet.Contains(DicomTags.SopInstanceUid))
{
MediaStorageSopInstanceUid = DataSet[DicomTags.SopInstanceUid].ToString();
}
Loaded = true;
return;
}
}
else
{
// TODO CR (04 Apr 2014): this code here is almost identical to the seekable stream above, except that we use the 4CC wrapper
// we can combine these two when we trust that the wrapper works in all cases
iStream = FourCcReadStream.Create(iStream);
// Read the 128 byte header first, then check for DICM
iStream.SeekEx(128, SeekOrigin.Begin);
if (!FileHasPart10Header(iStream))
{
if (!Flags.IsSet(options, DicomReadOptions.ReadNonPart10Files))
{
throw new DicomException(String.Format("File is not part 10 format file: {0}", Filename));
}
iStream.Seek(0, SeekOrigin.Begin);
dsr = new DicomStreamReader(iStream)
{
StreamOpener = streamOpener,
TransferSyntax = TransferSyntax.ImplicitVrLittleEndian,
Dataset = DataSet
};
DicomReadStatus stat = dsr.Read(stopTag, options);
if (stat != DicomReadStatus.Success)
{
Platform.Log(LogLevel.Error, "Unexpected error when reading file: {0}", Filename);
throw new DicomException("Unexpected read error with file: " + Filename);
}
TransferSyntax = TransferSyntax.ImplicitVrLittleEndian;
if (DataSet.Contains(DicomTags.SopClassUid))
{
MediaStorageSopClassUid = DataSet[DicomTags.SopClassUid].ToString();
}
if (DataSet.Contains(DicomTags.SopInstanceUid))
{
MediaStorageSopInstanceUid = DataSet[DicomTags.SopInstanceUid].ToString();
}
Loaded = true;
return;
}
}
dsr = new DicomStreamReader(iStream)
{
TransferSyntax = TransferSyntax.ExplicitVrLittleEndian,
StreamOpener = streamOpener,
Dataset = MetaInfo
};
DicomReadStatus readStat =
dsr.Read(new DicomTag(0x0002FFFF, "Bogus Tag", "BogusTag", DicomVr.UNvr, false, 1, 1, false), options);
if (readStat != DicomReadStatus.Success)
{
Platform.Log(LogLevel.Error, "Unexpected error when reading file Meta info for file: {0}", Filename);
throw new DicomException("Unexpected failure reading file Meta info for file: " + Filename);
}
MetaInfoFileLength = dsr.EndGroupTwo + 128 + 4;
dsr.Dataset = DataSet;
dsr.TransferSyntax = TransferSyntax;
readStat = dsr.Read(stopTag, options);
if (readStat != DicomReadStatus.Success)
{
Platform.Log(LogLevel.Error, "Unexpected error ({0}) when reading file at offset {2}: {1}", readStat, Filename, dsr.BytesRead);
throw new DicomException("Unexpected failure (" + readStat + ") reading file at offset " + dsr.BytesRead + ": " + Filename);
}
Loaded = true;
}
