com.pixelmed.codec.jpeg

Class EntropyCodedSegment

java.lang.Object

com.pixelmed.codec.jpeg.EntropyCodedSegment

public class EntropyCodedSegment
extends Object

A JPEG Entropy Coded Segment.

Development of this class was supported by funding from MDDX Research and Informatics.

Constructor Summary

Constructors

Constructor and Description

EntropyCodedSegment(MarkerSegmentSOS sos, MarkerSegmentSOF sof, Map<String,HuffmanTable> htByClassAndIdentifer, Map<String,QuantizationTable> qtByIdentifer, int nMCUHorizontally, Vector<Shape> redactionShapes, boolean copying, boolean dumping, boolean decompressing, Parse.DecompressedOutput decompressedOutput) Set up the environment to decode an EntropyCodedSeqment to dump, redact or copy as required.

Method Summary

Modifier and Type	Method and Description
byte[]	finish(byte[] bytesToDecompress, int mcuCount, int mcuOffset) Decode the supplied bytes that comprise a complete EntropyCodedSeqment and redact or copy them as required.

Methods inherited from class java.lang.Object

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

Constructor Detail

EntropyCodedSegment

public EntropyCodedSegment(MarkerSegmentSOS sos,
                           MarkerSegmentSOF sof,
                           Map<String,HuffmanTable> htByClassAndIdentifer,
                           Map<String,QuantizationTable> qtByIdentifer,
                           int nMCUHorizontally,
                           Vector<Shape> redactionShapes,
                           boolean copying,
                           boolean dumping,
                           boolean decompressing,
                           Parse.DecompressedOutput decompressedOutput)
                    throws Exception

Set up the environment to decode an EntropyCodedSeqment to dump, redact or copy as required.

Parameters:

sos - SOS marker segment contents

sof - SOF marker segment contents

htByClassAndIdentifer - Huffman tables

qtByIdentifer - quantization tables

nMCUHorizontally - the number of MCUs in a single row

redactionShapes - a Vector of Shape that are Rectangle

copying - true if copying

dumping - true if dumping

decompressing - true if decompressing

decompressedOutput - the decompressed output (with specified or default endianness if precision > 8)

Throws:

Exception - if JPEG process not supported

Method Detail

finish

public final byte[] finish(byte[] bytesToDecompress,
                           int mcuCount,
                           int mcuOffset)
                    throws Exception,
                           IOException

Decode the supplied bytes that comprise a complete EntropyCodedSeqment and redact or copy them as required.

Parameters:

bytesToDecompress - the bytes in the EntropyCodedSeqment

mcuCount - the number of MCUs encoded by this EntropyCodedSeqment

mcuOffset - the number of MCUs that have previously been read for the frame containing this EntropyCodedSeqment

Returns:

the bytes in a copy of the EntropyCodedSeqment appropriately redacted

Throws:

Exception - if bad things happen parsing the EntropyCodedSeqment, like running out of bits, caused by malformed input

IOException - if bad things happen reading or writing the bytes