Modifier and Type	Class and Description
private static class	MMRDecompressor.Code
private class	MMRDecompressor.RunData A class encapsulating the compressed raw data.

Modifier and Type	Field and Description
private static MMRDecompressor.Code[]	blackTable
private MMRDecompressor.RunData	data
private static final int	FIRST_LEVEL_TABLE_MASK
private static final int	FIRST_LEVEL_TABLE_SIZE
private int	height
private static MMRDecompressor.Code[]	modeTable
private static final int	SECOND_LEVEL_TABLE_MASK
private static final int	SECOND_LEVEL_TABLE_SIZE
private static MMRDecompressor.Code[]	whiteTable
private int	width

Access	Constructor and Description
public	MMRDecompressor(int width, int height, ImageInputStream stream)

Method Summary

Modifier and Type	Method and Description
private static MMRDecompressor.Code[]	createLittleEndianTable(int[][] codes) For little endian, the tables are structured like this: v--------v length = FIRST_LEVEL_TABLE_LENGTH v-----v length = SECOND_LEVEL_TABLE_LENGTH A code word which fits into the first level table (length=3) [Cccvvvvv] A code word which needs the second level table also (length=10) [Cccccccc] -> [ccvvv] "C" denotes the first code word bit "c" denotes a code word bit "v" denotes a variant bit
private void	detectAndSkipEOL()
private void	fillBitmap(Bitmap result, int line, int[] currentOffsets, int count)
private static final synchronized void	initTables()
public Bitmap	uncompress()
private final int	uncompress1D(MMRDecompressor.RunData runData, int[] runOffsets, int width)
private final int	uncompress2D(MMRDecompressor.RunData runData, int[] referenceOffsets, int refRunLength, int[] runOffsets, int width)

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

blackTable	back to summary
private static MMRDecompressor.Code[] blackTable

data	back to summary
private MMRDecompressor.RunData data

FIRST_LEVEL_TABLE_MASK	back to summary
private static final int FIRST_LEVEL_TABLE_MASK

FIRST_LEVEL_TABLE_SIZE	back to summary
private static final int FIRST_LEVEL_TABLE_SIZE

height	back to summary
private int height

modeTable	back to summary
private static MMRDecompressor.Code[] modeTable

SECOND_LEVEL_TABLE_MASK	back to summary
private static final int SECOND_LEVEL_TABLE_MASK

SECOND_LEVEL_TABLE_SIZE	back to summary
private static final int SECOND_LEVEL_TABLE_SIZE

whiteTable	back to summary
private static MMRDecompressor.Code[] whiteTable

width	back to summary
private int width

MMRDecompressor	back to summary
public MMRDecompressor(int width, int height, ImageInputStream stream)

Method Detail

createLittleEndianTable	back to summary
private static MMRDecompressor.Code[] createLittleEndianTable(int[][] codes) For little endian, the tables are structured like this: v--------v length = FIRST_LEVEL_TABLE_LENGTH v-----v length = SECOND_LEVEL_TABLE_LENGTH A code word which fits into the first level table (length=3) [Cccvvvvv] A code word which needs the second level table also (length=10) [Cccccccc] -> [ccvvv] "C" denotes the first code word bit "c" denotes a code word bit "v" denotes a variant bit

createLittleEndianTable

back to summary

private static MMRDecompressor.Code[] createLittleEndianTable(int[][] codes)

For little endian, the tables are structured like this:

 v--------v length = FIRST_LEVEL_TABLE_LENGTH
               v-----v length = SECOND_LEVEL_TABLE_LENGTH

 A code word which fits into the first level table (length=3)
 [Cccvvvvv]

 A code word which needs the second level table also (length=10)
 [Cccccccc] -> [ccvvv]

 "C" denotes the first code word bit
 "c" denotes a code word bit
 "v" denotes a variant bit

detectAndSkipEOL	back to summary
private void detectAndSkipEOL()

fillBitmap	back to summary
private void fillBitmap(Bitmap result, int line, int[] currentOffsets, int count)

initTables	back to summary
private static final synchronized void initTables()

uncompress	back to summary
public Bitmap uncompress()

uncompress1D	back to summary
private final int uncompress1D(MMRDecompressor.RunData runData, int[] runOffsets, int width)

uncompress2D	back to summary
private final int uncompress2D(MMRDecompressor.RunData runData, int[] referenceOffsets, int refRunLength, int[] runOffsets, int width)

org.apache.pdfbox.jbig2.decoder.mmr back to summary

private final Class MMRDecompressor.Code

Class Inheritance

extends Object

java.lang.Object
org.apache.pdfbox.jbig2.decoder.mmr.MMRDecompressor.Code

Field Summary

Modifier and Type	Field and Description
pack-priv final int	bitLength
pack-priv final int	codeWord
pack-priv final int	runLength
pack-priv MMRDecompressor.Code[]	subTable

Constructor Summary

Access	Constructor and Description
pack-priv	Code(int[] codeData)

Method Summary

Modifier and Type	Method and Description
public boolean	equals(Object the reference object with which to compare. obj) Overrides java.lang.Object.equals. Indicates whether some other object is "equal to" this one.
public String	toString() Overrides java.lang.Object.toString. Returns a string representation of the object.

Inherited from java.lang.Object:: clone finalize getClass hashCode notify notifyAll wait wait wait

Field Detail

bitLength	back to summary
pack-priv final int bitLength

codeWord	back to summary
pack-priv final int codeWord

runLength	back to summary
pack-priv final int runLength

subTable	back to summary
pack-priv MMRDecompressor.Code[] subTable

Constructor Detail

Code	back to summary
pack-priv Code(int[] codeData)

Method Detail

equals back to summary

equals	back to summary
public boolean equals(Object obj) Overrides java.lang.Object.equals. Doc from java.lang.Object.equals. Indicates whether some other object is "equal to" this one. The `equals` method implements an equivalence relation on non-null object references: It is reflexive: for any non-null reference value `x`, `x.equals(x)` should return `true`. It is symmetric: for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`. It is transitive: for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`. It is consistent: for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified. For any non-null reference value `x`, `x.equals(null)` should return `false`. An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes. Parameters obj:Object the reference object with which to compare. Returns:boolean `true` if this object is the same as the obj argument; `false` otherwise. See Also `java.lang.Object#equals(Object)`

public boolean equals(Object obj)

Overrides java.lang.Object.equals.

Doc from java.lang.Object.equals.

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

It is reflexive: for any non-null reference value x, x.equals(x) should return true.
It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

Parameters

obj:Object: the reference object with which to compare.

Returns:boolean

true if this object is the same as the obj argument; false otherwise.

See Also

java.lang.Object#equals(Object)

toString back to summary

toString	back to summary
public String toString() Overrides java.lang.Object.toString. Doc from java.lang.Object.toString. Returns a string representation of the object. Satisfying this method's contract implies a non-`null` result must be returned. Returns:String a string representation of the object

public String toString()

Overrides java.lang.Object.toString.

Doc from java.lang.Object.toString.

Returns a string representation of the object. Satisfying this method's contract implies a non-null result must be returned.

Returns:String: a string representation of the object

org.apache.pdfbox.jbig2.decoder.mmr back to summary

private final Class MMRDecompressor.RunData

Class Inheritance

extends Object

java.lang.Object
org.apache.pdfbox.jbig2.decoder.mmr.MMRDecompressor.RunData

A class encapsulating the compressed raw data.

Field Summary

Modifier and Type	Field and Description
pack-priv byte[]	buffer
pack-priv int	bufferBase
pack-priv int	bufferTop
private static final int	CODE_OFFSET
pack-priv int	lastCode
pack-priv int	lastOffset
private static final int	MAX_RUN_DATA_BUFFER
private static final int	MIN_RUN_DATA_BUFFER
pack-priv int	offset
pack-priv ImageInputStream	stream Compressed data stream.

Constructor Summary

Access	Constructor and Description
pack-priv	RunData(ImageInputStream stream)

Method Summary

Modifier and Type	Method and Description
private void	align() Skip to next byte
private void	fillBuffer(int byteOffset)
private final MMRDecompressor.Code	uncompressGetCode(MMRDecompressor.Code[] table)
private final MMRDecompressor.Code	uncompressGetCodeLittleEndian(MMRDecompressor.Code[] table)
private final int	uncompressGetNextCodeLittleEndian() Fill up the code word in little endian mode.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

buffer	back to summary
pack-priv byte[] buffer

bufferBase	back to summary
pack-priv int bufferBase

bufferTop	back to summary
pack-priv int bufferTop

CODE_OFFSET	back to summary
private static final int CODE_OFFSET

lastCode	back to summary
pack-priv int lastCode

lastOffset	back to summary
pack-priv int lastOffset

MAX_RUN_DATA_BUFFER	back to summary
private static final int MAX_RUN_DATA_BUFFER

MIN_RUN_DATA_BUFFER	back to summary
private static final int MIN_RUN_DATA_BUFFER

offset	back to summary
pack-priv int offset

stream	back to summary
pack-priv ImageInputStream stream Compressed data stream.

Constructor Detail

RunData	back to summary
pack-priv RunData(ImageInputStream stream)

Method Detail

align	back to summary
private void align() Skip to next byte

fillBuffer	back to summary
private void fillBuffer(int byteOffset) throws IOException

uncompressGetCode	back to summary
private final MMRDecompressor.Code uncompressGetCode(MMRDecompressor.Code[] table)

uncompressGetCodeLittleEndian	back to summary
private final MMRDecompressor.Code uncompressGetCodeLittleEndian(MMRDecompressor.Code[] table)

uncompressGetNextCodeLittleEndian

back to summary

private final int uncompressGetNextCodeLittleEndian()

Fill up the code word in little endian mode. This is a hotspot, therefore the algorithm is heavily optimised. For the frequent cases (i.e. short words) we try to get away with as little work as possible.
This method returns code words of 16 bits, which are aligned to the 24th bit. The lowest 8 bits are used as a "queue" of bits so that an access to the actual data is only needed, when this queue becomes empty.

public Class MMRDecompressor

Nested and Inner Type Summary

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail

private final Class MMRDecompressor.Code

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail

private final Class MMRDecompressor.RunData

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail