com.pixelmed.dicom

Class DicomInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

com.pixelmed.dicom.BinaryInputStream

com.pixelmed.dicom.DicomInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class DicomInputStream
extends BinaryInputStream

A class that extends BinaryInputStream by adding the concept of transfer syntaxes, for a (possible) meta information header and a data set.

Note this class does not automatically switch from meta information header to data set transfer syntaxes. That is the responsibility of the caller parsing the individual attributes (such as by reaching the end of the meta information group length, and then calling setReadingDataSet().

See Also:

AttributeList, DicomOutputStream

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor and Description
DicomInputStream(java.io.File file) Construct a stream to read DICOM data sets from the supplied stream.
DicomInputStream(java.io.File file, java.lang.String transferSyntaxUID, boolean tryMeta) Construct a stream to read DICOM data sets from the supplied stream.
DicomInputStream(java.io.InputStream i) Construct a stream to read DICOM data sets from the supplied stream.
DicomInputStream(java.io.InputStream i, java.lang.String transferSyntaxUID, boolean tryMeta) Construct a stream to read DICOM data sets from the supplied stream.

Method Summary

Modifier and Type	Method and Description
boolean	areReadingDataSet() Are we reading the dataset?
boolean	areReadingMetaHeader() Are we reading the meta information header?
long	getByteOffsetOfStartOfData() Get the byte offset of the start of the dataset or meta information header.
TransferSyntax	getTransferSyntaxInUse() Get the transfer syntax currently in use.
TransferSyntax	getTransferSyntaxToReadDataSet() Get the transfer syntax to be used for reading the data set.
TransferSyntax	getTransferSyntaxToReadMetaHeader() Get the transfer syntax to be used for reading the meta information header.
void	guessTransferSyntaxToReadDataSet()
boolean	haveMetaHeader() Do we have a meta information header?
void	setReadingDataSet() Switch to the transfer syntax for reading the dataset.
void	setReadingMetaHeader() Switch to the transfer syntax for reading the meta information header.
void	setTransferSyntaxToReadDataSet(TransferSyntax ts) Specify what transfer syntax to use when switching from reading the meta information header to reading the data set.

Methods inherited from class com.pixelmed.dicom.BinaryInputStream

getFile, isBigEndian, isLittleEndian, main, readComplexDouble, readComplexFloat, readDouble, readDouble, readFloat, readFloat, readInsistently, readSigned16, readSigned32, readSigned64, readUnsigned16, readUnsigned16, readUnsigned16, readUnsigned32, readUnsigned32, readUnsigned32, readUnsigned64, readUnsigned64, readUnsigned64, readUnsigned8, setBigEndian, setEndian, setFile, setLittleEndian, skipInsistently

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, read, read, read, reset, skip

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DicomInputStream

public DicomInputStream(java.io.File file)
                 throws java.io.IOException

Construct a stream to read DICOM data sets from the supplied stream.

Look for a meta information header; if absent guess at a transfer syntax based on the contents.

Parameters:

file - the file to read from

Throws:

java.io.IOException - if an I/O error occurs

DicomInputStream

public DicomInputStream(java.io.File file,
                        java.lang.String transferSyntaxUID,
                        boolean tryMeta)
                 throws java.io.IOException

Construct a stream to read DICOM data sets from the supplied stream.

Parameters:

file - the file to read from

transferSyntaxUID - use this transfer syntax (may be null)

tryMeta - if true, try to find a meta information header

Throws:

java.io.IOException - if an I/O error occurs

DicomInputStream

public DicomInputStream(java.io.InputStream i)
                 throws java.io.IOException

Construct a stream to read DICOM data sets from the supplied stream.

Look for a meta information header; if absent guess at a transfer syntax based on the contents.

Parameters:

i - the input stream to read from

Throws:

java.io.IOException - if an I/O error occurs

DicomInputStream

public DicomInputStream(java.io.InputStream i,
                        java.lang.String transferSyntaxUID,
                        boolean tryMeta)
                 throws java.io.IOException

Construct a stream to read DICOM data sets from the supplied stream.

Parameters:

i - the input stream to read from

transferSyntaxUID - use this transfer syntax (may be null)

tryMeta - if true, try to find a meta information header

Throws:

java.io.IOException - if an I/O error occurs

Method Detail

areReadingDataSet

public boolean areReadingDataSet()

Are we reading the dataset?

Returns:

true if reading the dataset, false if reading the meta information header

areReadingMetaHeader

public boolean areReadingMetaHeader()

Are we reading the meta information header?

Returns:

true if reading the meta information header, false if reading the dataset

getByteOffsetOfStartOfData

public long getByteOffsetOfStartOfData()

Get the byte offset of the start of the dataset or meta information header.

Will be 0 if no preamble, 132 if a preamble.

Returns:

the byte offset (from 0 being the start of the stream)

getTransferSyntaxInUse

public TransferSyntax getTransferSyntaxInUse()

Get the transfer syntax currently in use.

Returns:

the transfer syntax

getTransferSyntaxToReadDataSet

public TransferSyntax getTransferSyntaxToReadDataSet()

Get the transfer syntax to be used for reading the data set.

Returns:

the transfer syntax

getTransferSyntaxToReadMetaHeader

public TransferSyntax getTransferSyntaxToReadMetaHeader()

Get the transfer syntax to be used for reading the meta information header.

Returns:

the transfer syntax

guessTransferSyntaxToReadDataSet

public void guessTransferSyntaxToReadDataSet()
                                      throws java.io.IOException

Throws:

java.io.IOException

haveMetaHeader

public boolean haveMetaHeader()

Do we have a meta information header?

Returns:

true if there is a meta information header, false if not

setReadingDataSet

public void setReadingDataSet()

Switch to the transfer syntax for reading the dataset.

setReadingMetaHeader

public void setReadingMetaHeader()

Switch to the transfer syntax for reading the meta information header.

setTransferSyntaxToReadDataSet

public void setTransferSyntaxToReadDataSet(TransferSyntax ts)

Specify what transfer syntax to use when switching from reading the meta information header to reading the data set.

Parameters:

ts - transfer syntax to use for data set