BZip2OutputStream

java.lang.Object
- java.io.OutputStream
- - org.apache.commons.compress.compressors.bzip2.BZip2OutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable, BZip2Constants
```
public class BZip2OutputStream
extends java.io.OutputStream
implements BZip2Constants
```
An output stream that compresses into the BZip2 format (without the file header chars) into another stream. TODO: Update to BZip2 1.0.1

Author:

Keiron Liddle

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

private static class BZip2OutputStream.StackElem

Nested Classes
Modifier and Type	Class and Description
`private static class`	`BZip2OutputStream.StackElem`

Field Summary

Fields
Modifier and Type	Field and Description
`private static int`	`CLEARMASK`
`private static int`	`DEPTH_THRESH`
`private static int`	`GREATER_ICOST`
`private static int`	`LESSER_ICOST`
`private static int`	`LOWER_BYTE_MASK`
`private int`	`m_allowableBlockSize`
`private char[]`	`m_block`
`private int`	`m_blockCRC`
`private boolean`	`m_blockRandomised`
`private int`	`m_blockSize100k`
`private int`	`m_bsBuff`
`private int`	`m_bsLive`
`private java.io.OutputStream`	`m_bsStream`
`private boolean`	`m_closed`
`private int`	`m_combinedCRC`
`private CRC`	`m_crc`
`private int`	`m_currentChar`
`private boolean`	`m_firstAttempt`
`private int[]`	`m_ftab`
`private int[]`	`m_incs`
`private boolean[]`	`m_inUse`
`private int`	`m_last`
`private int[]`	`m_mtfFreq`
`private int`	`m_nInUse`
`private int`	`m_nMTF`
`private int`	`m_origPtr`
`private int[]`	`m_quadrant`
`private int`	`m_runLength`
`private char[]`	`m_selector`
`private char[]`	`m_selectorMtf`
`private char[]`	`m_seqToUnseq`
`private short[]`	`m_szptr`
`private char[]`	`m_unseqToSeq`
`private int`	`m_workDone`
`private int`	`m_workFactor`
`private int`	`m_workLimit`
`private int[]`	`m_zptr`
`private static int`	`QSORT_STACK_SIZE`
`private static int`	`SETMASK`
`private static int`	`SMALL_THRESH`
`private static int`	`UPPER_BYTE_MASK`

Fields inherited from interface org.apache.commons.compress.compressors.bzip2.BZip2Constants
BASE_BLOCK_SIZE, G_SIZE, MAX_ALPHA_SIZE, MAX_CODE_LEN, MAX_SELECTORS, N_GROUPS, N_ITERS, NUM_OVERSHOOT_BYTES, RAND_NUMS, RUNA, RUNB

Constructor Summary

Constructors
Constructor and Description

BZip2OutputStream(java.io.OutputStream output)

BZip2OutputStream(java.io.OutputStream output, int blockSize)

Constructors
Constructor and Description
`BZip2OutputStream(java.io.OutputStream output)`
`BZip2OutputStream(java.io.OutputStream output, int blockSize)`

Method Summary

Methods
Modifier and Type	Method and Description
`private void`	`allocateCompressStructures()`
`private void`	`bsFinishedWithStream()`
`private void`	`bsPutint(int u)`
`private void`	`bsPutIntVS(int numBits, int c)`
`private void`	`bsPutUChar(int c)`
`private void`	`bsSetStream(java.io.OutputStream f)`
`private void`	`bsW(int n, int v)`
`private static int`	`calculateWeight(int v1, int v2)`
`void`	`close()`
`private void`	`doReversibleTransformation()`
`private void`	`endBlock()`
`private void`	`endCompression()`
`protected void`	`finalize()`
`void`	`flush()`
`private boolean`	`fullGtU(int i1, int i2)`
`private void`	`generateMTFValues()`
`private void`	`hbAssignCodes(int[] code, char[] length, int minLen, int maxLen, int alphaSize)`
`private static void`	`hbMakeCodeLengths(char[] len, int[] freq, int alphaSize, int maxLen)`
`private void`	`initBlock()`
`private void`	`initialize()`
`private void`	`mainSort()`
`private void`	`makeMaps()`
`private char`	`med3(char a, char b, char c)`
`private void`	`moveToFrontCodeAndSend()`
`private static void`	`panic()`
`private void`	`qSort3(int loSt, int hiSt, int dSt)`
`private void`	`randomiseBlock()`
`private void`	`sendMTFValues()`
`private void`	`simpleSort(int lo, int hi, int d)`
`private void`	`vswap(int p1, int p2, int n)`
`void`	`write(int bv)` modified by Oliver Merkel, 010128
`private void`	`writeRun()`

Methods inherited from class java.io.OutputStream
write, write

Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOWER_BYTE_MASK
```
private static final int LOWER_BYTE_MASK
```
See Also:
Constant Field Values

UPPER_BYTE_MASK
```
private static final int UPPER_BYTE_MASK
```
See Also:
Constant Field Values

SETMASK
```
private static final int SETMASK
```
See Also:
Constant Field Values

CLEARMASK
```
private static final int CLEARMASK
```
See Also:
Constant Field Values

GREATER_ICOST
```
private static final int GREATER_ICOST
```
See Also:
Constant Field Values

LESSER_ICOST
```
private static final int LESSER_ICOST
```
See Also:
Constant Field Values

SMALL_THRESH
```
private static final int SMALL_THRESH
```
See Also:
Constant Field Values

DEPTH_THRESH
```
private static final int DEPTH_THRESH
```
See Also:
Constant Field Values

QSORT_STACK_SIZE
```
private static final int QSORT_STACK_SIZE
```
See Also:
Constant Field Values

m_crc
```
private CRC m_crc
```

m_inUse
```
private boolean[] m_inUse
```

m_seqToUnseq
```
private char[] m_seqToUnseq
```

m_unseqToSeq
```
private char[] m_unseqToSeq
```

m_selector
```
private char[] m_selector
```

m_selectorMtf
```
private char[] m_selectorMtf
```

m_mtfFreq
```
private int[] m_mtfFreq
```

m_currentChar
```
private int m_currentChar
```

m_runLength
```
private int m_runLength
```

m_closed
```
private boolean m_closed
```

m_incs
```
private int[] m_incs
```

m_blockRandomised
```
private boolean m_blockRandomised
```

m_blockSize100k
```
private int m_blockSize100k
```

m_bsBuff
```
private int m_bsBuff
```

m_bsLive
```
private int m_bsLive
```

m_last
```
private int m_last
```

m_origPtr
```
private int m_origPtr
```

m_allowableBlockSize
```
private int m_allowableBlockSize
```

m_block
```
private char[] m_block
```

m_blockCRC
```
private int m_blockCRC
```

m_combinedCRC
```
private int m_combinedCRC
```

m_bsStream

private java.io.OutputStream m_bsStream

m_firstAttempt
```
private boolean m_firstAttempt
```

m_ftab
```
private int[] m_ftab
```

m_nInUse
```
private int m_nInUse
```

m_nMTF
```
private int m_nMTF
```

m_quadrant
```
private int[] m_quadrant
```

m_szptr
```
private short[] m_szptr
```

m_workDone
```
private int m_workDone
```

m_workFactor
```
private int m_workFactor
```

m_workLimit
```
private int m_workLimit
```

m_zptr
```
private int[] m_zptr
```

Constructor Detail

BZip2OutputStream

public BZip2OutputStream(java.io.OutputStream output)
                  throws java.io.IOException

Throws:: java.io.IOException

BZip2OutputStream

public BZip2OutputStream(java.io.OutputStream output,
                 int blockSize)
                  throws java.io.IOException

Throws:: java.io.IOException

Method Detail

hbMakeCodeLengths

private static void hbMakeCodeLengths(char[] len,
                     int[] freq,
                     int alphaSize,
                     int maxLen)

calculateWeight

private static int calculateWeight(int v1,
                  int v2)

panic
```
private static void panic()
```

close
```
public void close()
           throws java.io.IOException
```
Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.OutputStream

Throws:

java.io.IOException

finalize
```
protected void finalize()
                 throws java.lang.Throwable
```
Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable

flush
```
public void flush()
           throws java.io.IOException
```
Specified by:

flush in interface java.io.Flushable

Overrides:

flush in class java.io.OutputStream

Throws:

java.io.IOException

write
```
public void write(int bv)
           throws java.io.IOException
```
modified by Oliver Merkel, 010128

Specified by:

write in class java.io.OutputStream

Parameters:
bv - Description of Parameter

Throws:

java.io.IOException - Description of Exception

allocateCompressStructures

private void allocateCompressStructures()

bsFinishedWithStream

private void bsFinishedWithStream()
                           throws java.io.IOException

Throws:: java.io.IOException

bsPutIntVS

private void bsPutIntVS(int numBits,
              int c)
                 throws java.io.IOException

Throws:: java.io.IOException

bsPutUChar

private void bsPutUChar(int c)
                 throws java.io.IOException

Throws:: java.io.IOException

bsPutint

private void bsPutint(int u)
               throws java.io.IOException

Throws:: java.io.IOException

bsSetStream

private void bsSetStream(java.io.OutputStream f)

bsW

private void bsW(int n,
       int v)
          throws java.io.IOException

Throws:: java.io.IOException

doReversibleTransformation

private void doReversibleTransformation()

endBlock

private void endBlock()
               throws java.io.IOException

Throws:: java.io.IOException

endCompression

private void endCompression()
                     throws java.io.IOException

Throws:: java.io.IOException

fullGtU

private boolean fullGtU(int i1,
              int i2)

generateMTFValues
```
private void generateMTFValues()
```

hbAssignCodes

private void hbAssignCodes(int[] code,
                 char[] length,
                 int minLen,
                 int maxLen,
                 int alphaSize)

initBlock
```
private void initBlock()
```

initialize

private void initialize()
                 throws java.io.IOException

Throws:: java.io.IOException

mainSort
```
private void mainSort()
```

makeMaps
```
private void makeMaps()
```

med3

private char med3(char a,
        char b,
        char c)

moveToFrontCodeAndSend

private void moveToFrontCodeAndSend()
                             throws java.io.IOException

Throws:: java.io.IOException

qSort3

private void qSort3(int loSt,
          int hiSt,
          int dSt)

randomiseBlock
```
private void randomiseBlock()
```

sendMTFValues

private void sendMTFValues()
                    throws java.io.IOException

Throws:: java.io.IOException

simpleSort

private void simpleSort(int lo,
              int hi,
              int d)

vswap

private void vswap(int p1,
         int p2,
         int n)

writeRun

private void writeRun()
               throws java.io.IOException

Throws:: java.io.IOException

Class BZip2OutputStream

Nested Class Summary

Field Summary

Fields inherited from interface org.apache.commons.compress.compressors.bzip2.BZip2Constants

Constructor Summary

Method Summary

Methods inherited from class java.io.OutputStream

Methods inherited from class java.lang.Object

Field Detail

LOWER_BYTE_MASK

UPPER_BYTE_MASK

SETMASK

CLEARMASK

GREATER_ICOST

LESSER_ICOST

SMALL_THRESH

DEPTH_THRESH

QSORT_STACK_SIZE

m_crc

m_inUse

m_seqToUnseq

m_unseqToSeq

m_selector

m_selectorMtf

m_mtfFreq

m_currentChar

m_runLength

m_closed

m_incs

m_blockRandomised

m_blockSize100k

m_bsBuff

m_bsLive

m_last

m_origPtr

m_allowableBlockSize

m_block

m_blockCRC

m_combinedCRC

m_bsStream

m_firstAttempt

m_ftab

m_nInUse

m_nMTF

m_quadrant

m_szptr

m_workDone

m_workFactor

m_workLimit

m_zptr

Constructor Detail

BZip2OutputStream

BZip2OutputStream

Method Detail

hbMakeCodeLengths

calculateWeight

panic

close

finalize

flush

write

allocateCompressStructures

bsFinishedWithStream

bsPutIntVS

bsPutUChar

bsPutint

bsSetStream

bsW

doReversibleTransformation

endBlock

endCompression

fullGtU

generateMTFValues

hbAssignCodes

initBlock

initialize

mainSort

makeMaps

med3

moveToFrontCodeAndSend