public static void SkipItemLittleEndian(DICOMBinaryReader dr, TransferSyntax syntax)
{
var length = LengthReader.ReadLittleEndian(VR.Null, dr.Skip(4));
if (length != -1)
{
dr.Skip(length);
}
else
{
if (syntax == TransferSyntax.EXPLICIT_VR_LITTLE_ENDIAN)
{
while (!IsEndOfSequenceItemLittleEndian(dr) && dr.StreamLength != dr.StreamPosition)
{
dr.StreamPosition -= 8;
DICOMElementReader.SkipElementExplicitLittleEndian(dr);
}
}
else
{
while (!IsEndOfSequenceItemLittleEndian(dr) && dr.StreamLength != dr.StreamPosition)
{
dr.StreamPosition -= 8;
DICOMElementReader.SkipElementImplicitLittleEndian(dr);
}
}
}
}
/// <summary>
/// Read explicit VR little endian up to transfer syntax element and determines transfer syntax for rest of elements
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <param name="syntax">the transfer syntax of the DICOM file</param>
/// <returns>elements preceeding and including transfer syntax element</returns>
public static List <IDICOMElement> ReadFileMetadata(DICOMBinaryReader dr, ref TransferSyntax syntax)
{
var elements = new List <IDICOMElement>();
syntax = syntax != TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN
? syntax
: TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN;
while (dr.StreamPosition < dr.StreamLength)
{
long position = dr.StreamPosition;
if (TagReader.ReadLittleEndian(dr).Group == _metaGroup)
{
dr.StreamPosition = position;
IDICOMElement el = DICOMElementReader.ReadElementExplicitLittleEndian(dr);
Tag uid = TagHelper.TRANSFER_SYNTAX_UID;
if (el.Tag == uid)
{
syntax = TransferSyntaxHelper.GetSyntax(el);
}
elements.Add(el);
}
else
{
dr.StreamPosition = position;
break;
}
}
return(elements);
}
/// <summary>
/// Read explicit VR little endian up to transfer syntax element and determines transfer syntax for rest of elements
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <param name="syntax">the transfer syntax of the DICOM file</param>
/// <returns>elements preceeding and including transfer syntax element</returns>
private static List <IDICOMElement> ReadFileMetadata(DICOMBinaryReader dr, out TransferSyntax syntax)
{
List <IDICOMElement> elements = new List <IDICOMElement>();
syntax = TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN;
while (dr.StreamPosition < dr.StreamLength)
{
long position = dr.StreamPosition;
if (TagReader.ReadLittleEndian(dr).Group == _MetaGroup)
{
dr.StreamPosition = position;
IDICOMElement el = DICOMElementReader.ReadElementExplicitLittleEndian(dr);
if (el.Tag.CompleteID == TagHelper.TRANSFER_SYNTAX_UID.CompleteID)
{
syntax = TransferSyntaxHelper.GetSyntax(el);
}
elements.Add(el);
}
else
{
dr.StreamPosition = position;
break;
}
}
return(elements);
}
/// <summary>
/// Read explicit VR little endian up to transfer syntax element and determines transfer syntax for rest of elements
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <param name="syntax">the transfer syntax of the DICOM file</param>
/// <returns>elements preceeding and including transfer syntax element</returns>
public static List <IDICOMElement> ReadFileMetadata(DICOMBinaryReader dr, ref TransferSyntax syntax, ref StringEncoding enc)
{
var elements = new List <IDICOMElement>();
while (dr.StreamPosition < dr.StreamLength)
{
var position = dr.StreamPosition;
if (TagReader.ReadLittleEndian(dr).Group == _metaGroup)
{
dr.StreamPosition = position;
var el = DICOMElementReader.ReadElementExplicitLittleEndian(dr, enc);
if (el.Tag == TagHelper.TransferSyntaxUID)
{
syntax = TransferSyntaxHelper.GetSyntax(el);
}
elements.Add(el);
}
else
{
dr.StreamPosition = position;
break;
}
}
return(elements);
}
public static DICOMObject ReadObject(byte[] objectBytes, TransferSyntax syntax)
{
List <IDICOMElement> elements;
using (DICOMBinaryReader dr = new DICOMBinaryReader(objectBytes))
{
elements = DICOMElementReader.ReadAllElements(dr, syntax);
}
return(new DICOMObject(elements));
}
private static DICOMObject ReadIndefiniteBigEndian(DICOMBinaryReader dr, TransferSyntax syntax, StringEncoding enc)
{
var elements = new List <IDICOMElement>();
while (!IsEndOfSequenceItemLittleEndian(dr) && dr.StreamLength != dr.StreamPosition)
{
dr.StreamPosition -= 8;
elements.Add(DICOMElementReader.ReadElementExplicitBigEndian(dr, enc));
}
return(new DICOMObject(elements));
}
public static DICOMObject ReadObject(byte[] objectBytes, TransferSyntax syntax, out long bytesRead)
{
List <IDICOMElement> elements;
using (var dr = new DICOMBinaryReader(objectBytes))
{
elements = DICOMElementReader.ReadAllElements(dr, syntax);
bytesRead = dr.StreamPosition;
}
return(new DICOMObject(elements));
}
/// <summary>
/// Reads a DICOM file from a byte array
/// </summary>
/// <param name="fileBytes">the bytes of the DICOM file</param>
/// <returns>a DICOM object containing all elements</returns>
public static DICOMObject Read(byte[] fileBytes)
{
TransferSyntax syntax;
List <IDICOMElement> elements;
using (DICOMBinaryReader dr = new DICOMBinaryReader(fileBytes))
{
DICOMPreambleReader.Read(dr);
List <IDICOMElement> metaElements = ReadFileMetadata(dr, out syntax);
elements = metaElements.Union(DICOMElementReader.ReadAllElements(dr, syntax)).ToList();
}
return(new DICOMObject(elements));
}
/// <summary>
/// Reads a DICOM file from a byte array
/// </summary>
/// <param name="fileBytes">the bytes of the DICOM file</param>
/// <returns>a DICOM object containing all elements</returns>
public static DICOMObject Read(byte[] fileBytes,
TransferSyntax trySyntax = TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN)
{
TransferSyntax syntax = trySyntax; //Will keep if metadata doesn't exist
List <IDICOMElement> elements;
using (var dr = new DICOMBinaryReader(fileBytes))
{
DICOMPreambleReader.Read(dr);
List <IDICOMElement> metaElements = ReadFileMetadata(dr, ref syntax);
elements = metaElements.Concat(DICOMElementReader.ReadAllElements(dr, syntax)).ToList();
}
return(new DICOMObject(elements));
}
/// <summary>
/// Reads a DICOM file from a path
/// </summary>
/// <param name="filePath">the path to the DICOM file</param>
/// <returns>a DICOM object containing all elements</returns>
public static DICOMObject Read(string filePath,
TransferSyntax trySyntax = TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN)
{
var syntax = trySyntax;
List <IDICOMElement> elements;
using (var dr = new DICOMBinaryReader(filePath))
{
DICOMPreambleReader.Read(dr);
var metaElements = ReadFileMetadata(dr, ref syntax);
elements = metaElements.Concat(DICOMElementReader.ReadAllElements(dr, syntax)).ToList();
}
return(new DICOMObject(elements));
}
/// <summary>
/// Asynchronously reads a DICOM file from a path
/// </summary>
/// <param name="filePath">the path to the DICOM file</param>
/// <returns>a DICOM object containing all elements</returns>
public static async Task <DICOMObject> ReadAsync(string filePath,
TransferSyntax trySyntax = TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN)
{
return(await Task.Run(() =>
{
TransferSyntax syntax = trySyntax;
List <IDICOMElement> elements;
using (var dr = new DICOMBinaryReader(filePath))
{
DICOMPreambleReader.Read(dr);
List <IDICOMElement> metaElements = ReadFileMetadata(dr, ref syntax);
elements = metaElements.Concat(DICOMElementReader.ReadAllElements(dr, syntax)).ToList();
}
return new DICOMObject(elements);
}));
}
public static void SkipItemBigEndian(DICOMBinaryReader dr)
{
var length = LengthReader.ReadBigEndian(VR.Null, dr.Skip(4));
if (length != -1)
{
dr.Skip(length);
}
else
{
while (!IsEndOfSequenceItemBigEndian(dr) && dr.StreamLength != dr.StreamPosition)
{
dr.StreamPosition -= 8;
DICOMElementReader.SkipElementExplicitBigEndian(dr);
}
}
}
private static DICOMObject ReadIndefiniteLittleEndian(DICOMBinaryReader dr, TransferSyntax syntax, StringEncoding enc)
{
var elements = new List <IDICOMElement>();
while (!IsEndOfSequenceItemLittleEndian(dr) && dr.StreamLength != dr.StreamPosition)
{
dr.StreamPosition -= 8;
if (syntax == TransferSyntax.EXPLICIT_VR_LITTLE_ENDIAN)
{
elements.Add(DICOMElementReader.ReadElementExplicitLittleEndian(dr, enc));
}
else
{
elements.Add(DICOMElementReader.ReadElementImplicitLittleEndian(dr, enc));
}
}
return(new DICOMObject(elements));
}
public static DICOMObject ReadObject(DICOMBinaryReader dr, TransferSyntax syntax)
{
List <IDICOMElement> elements = DICOMElementReader.ReadAllElements(dr, syntax);
return(new DICOMObject(elements));
}
public static DICOMObject ReadObject(DICOMBinaryReader dr, TransferSyntax syntax, StringEncoding enc = StringEncoding.ISO_IR_192)
{
var elements = DICOMElementReader.ReadAllElements(dr, syntax, enc);
return(new DICOMObject(elements));
}
