/*
openDICOM.NET openDICOM# 0.1.1
openDICOM# provides a library for DICOM related development on Mono.
Copyright (C) 2006-2007 Albert Gnandt
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
$Id: DicomFile.cs 48 2007-03-28 13:49:15Z agnandt $
*/
using System;
using System.IO;
using openDicom;
using openDicom.Registry;
using openDicom.DataStructure;
using openDicom.DataStructure.DataSet;
using openDicom.Encoding;
using openDicom.Image;
namespace openDicom.File{
/// <summary>
/// This class represents a DICOM file.
/// </summary>
public class DicomFile: AcrNemaFile
{
private FileMetaInformation metaInformation = null;
/// <summary>
/// DICOM file meta information. This is a DICOM data set.
/// </summary>
public FileMetaInformation MetaInformation
{
get
{
if (metaInformation != null)
return metaInformation;
else
throw new DicomException("DicomFile.MetaInformation is null.");
}
}
/// <summary>
/// Creates a DICOM file instance from any DICOM output stream.
/// </summary>
public DicomFile(Stream stream): base(stream) {}
/// <summary>
/// Creates a DICOM file instance from any DICOM output stream.
/// <see cref="IsStrictDecoded" /> is set to specified decoding
/// attribute.
/// </summary>
public DicomFile(Stream stream, bool useStrictDecoding):
base(stream, useStrictDecoding) {}
/// <summary>
/// Creates a DICOM file instance from a DICOM file.
/// </summary>
public DicomFile(string fileName): base(fileName) {}
/// <summary>
/// Creates a DICOM file instance from a DICOM file.
/// <see cref="IsStrictDecoded" /> is set to given decoding
/// attribute.
/// </summary>
public DicomFile(string fileName, bool useStrictDecoding):
base(fileName, useStrictDecoding) {}
/// <summary>
/// Creates a DICOM file instance from a DICOM file.
/// <see cref="IsStrictDecoded" /> is set to given decoding
/// attribute. If memory preloading is activated, the
/// entire file content will be written to memory and afterwards
/// processed.
/// </summary>
public DicomFile(string fileName, bool preloadToMemory,
bool useStrictDecoding):
base(fileName, preloadToMemory, useStrictDecoding) {}
/// <summary>
/// Determines whether a specified file is a DICOM file.
/// </summary>
public static bool IsDicomFile(string fileName)
{
FileStream fileStream = new FileStream(fileName, FileMode.Open,
FileAccess.Read);
try
{
if (fileStream.Length > 132)
{
byte[] buffer = new byte[132];
fileStream.Read(buffer, 0, 132);
string dicomPrefix =
TransferSyntax.FileMetaInformation
.ToString(buffer, 128, 4);
return dicomPrefix.Equals(FileMetaInformation.DicomPrefix);
}
else return false;
}
finally
{
fileStream.Close();
}
}
/// <summary>
/// Re-creates a DICOM file instance from specified DICOM output
/// stream.
/// </summary>
public override void LoadFrom(Stream stream)
{
metaInformation = new FileMetaInformation(stream);
DataElement transferSyntaxDataElement =
MetaInformation[TransferSyntax.UidTag];
Uid uid = (Uid) transferSyntaxDataElement.Value[0];
dataSet = new DataSet(stream, new TransferSyntax(uid));
pixelData = new PixelData(GetJointDataSets());
}
/// <summary>
/// Concatenates DICOM file meta information and DICOM data set to one
/// and returns it. Aim of this method is to ease the use of
/// <see cref="AcrNemaFile" /> and <see cref="DicomFile" /> without
/// differentiation. But be careful! Resulting data set will always
/// use the default transfer syntax!
/// </summary>
/// <remarks>
/// If an exception occurres, because of duplicate key ids
/// (DICOM tags), DICOM tag uniqueness overall data sets
/// will not be given. This exception is not supposed to be
/// thrown. DICOM data sets for concatenation are supposed to
/// complement one another. The differences in transfer syntaxes
/// cannot be processed. Thus, the default transfer syntax is
/// defined for concatenation.
/// </remarks>
public override DataSet GetJointDataSets()
{
DataSet dataSet = new DataSet();
dataSet.Add(MetaInformation);
dataSet.Add(DataSet);
return dataSet;
}
}
}
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