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ClassLib.Common.java.util.zip
Class DeflaterEngine
java.lang.ObjectClassLib.Common.java.util.zip.DeflaterEngine
- All Implemented Interfaces:
- DeflaterConstants
- class DeflaterEngine
- extends java.lang.Object
- implements DeflaterConstants
- extends java.lang.Object
DeflaterEngine
- Version:
- $Id: DeflaterEngine.java,v 1.7 2003/05/12 10:04:53 joewhaley Exp $
| Field Summary | |
private Adler32 |
adler
The adler checksum |
private int |
blockStart
|
private byte[] |
buffer
|
static int[] |
COMPR_FUNC
|
private int |
comprFunc
The current compression function. |
static boolean |
DEBUGGING
|
static int |
DEFAULT_MEM_LEVEL
|
static int |
DEFLATE_FAST
|
static int |
DEFLATE_SLOW
|
static int |
DEFLATE_STORED
|
static int |
DYN_TREES
|
static int[] |
GOOD_LENGTH
|
private int |
goodLength
|
static int |
HASH_BITS
|
static int |
HASH_MASK
|
static int |
HASH_SHIFT
|
static int |
HASH_SIZE
|
private short[] |
head
Hashtable, hashing three characters to an index for window, so that window[index]..window[index+2] have this hash code. |
private DeflaterHuffman |
huffman
|
private byte[] |
inputBuf
The input data for compression. |
private int |
inputEnd
The end offset of the input data. |
private int |
inputOff
The offset into inputBuf, where input data starts. |
private int |
ins_h
|
private int |
lookahead
lookahead is the number of characters starting at strstart in window that are valid. |
private int |
matchLen
|
private int |
matchStart
|
static int |
MAX_BLOCK_SIZE
|
private int |
max_chain
|
static int[] |
MAX_CHAIN
|
static int |
MAX_DIST
|
private int |
max_lazy
|
static int[] |
MAX_LAZY
|
static int |
MAX_MATCH
|
static int |
MAX_WBITS
|
static int |
MIN_LOOKAHEAD
|
static int |
MIN_MATCH
|
static int[] |
NICE_LENGTH
|
private int |
niceLength
|
private DeflaterPending |
pending
|
static int |
PENDING_BUF_SIZE
|
static int |
PRESET_DICT
|
private short[] |
prev
prev[index & WMASK] points to the previous index that has the same hash code as the string starting at index. |
private boolean |
prevAvailable
|
static int |
STATIC_TREES
|
static int |
STORED_BLOCK
|
private int |
strategy
|
private int |
strstart
strstart points to the current character in window. |
private static int |
TOO_FAR
|
private int |
totalIn
The total bytes of input read. |
private byte[] |
window
This array contains the part of the uncompressed stream that is of relevance. |
static int |
WMASK
|
static int |
WSIZE
|
| Constructor Summary | |
(package private) |
DeflaterEngine(DeflaterPending pending)
|
| Method Summary | |
boolean |
deflate(boolean flush,
boolean finish)
|
private boolean |
deflateFast(boolean flush,
boolean finish)
|
private boolean |
deflateSlow(boolean flush,
boolean finish)
|
private boolean |
deflateStored(boolean flush,
boolean finish)
|
private void |
fillWindow()
Fill the window when the lookahead becomes insufficient. |
private boolean |
findLongestMatch(int curMatch)
Find the best (longest) string in the window matching the string starting at strstart. |
int |
getAdler()
|
int |
getTotalIn()
|
private int |
insertString()
Inserts the current string in the head hash and returns the previous value for this hash. |
boolean |
needsInput()
|
void |
reset()
|
void |
resetAdler()
|
(package private) void |
setDictionary(byte[] buffer,
int offset,
int length)
|
void |
setInput(byte[] buf,
int off,
int len)
|
void |
setLevel(int lvl)
|
void |
setStrategy(int strat)
|
private void |
slideWindow()
|
private void |
updateHash()
|
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
TOO_FAR
private static final int TOO_FAR
- See Also:
- Constant Field Values
ins_h
private int ins_h
buffer
private byte[] buffer
head
private short[] head
- Hashtable, hashing three characters to an index for window, so
that window[index]..window[index+2] have this hash code.
Note that the array should really be unsigned short, so you need
to and the values with 0xffff.
prev
private short[] prev
- prev[index & WMASK] points to the previous index that has the
same hash code as the string starting at index. This way
entries with the same hash code are in a linked list.
Note that the array should really be unsigned short, so you need
to and the values with 0xffff.
matchStart
private int matchStart
matchLen
private int matchLen
prevAvailable
private boolean prevAvailable
blockStart
private int blockStart
strstart
private int strstart
- strstart points to the current character in window.
lookahead
private int lookahead
- lookahead is the number of characters starting at strstart in
window that are valid.
So window[strstart] until window[strstart+lookahead-1] are valid
characters.
window
private byte[] window
- This array contains the part of the uncompressed stream that
is of relevance. The current character is indexed by strstart.
strategy
private int strategy
max_chain
private int max_chain
max_lazy
private int max_lazy
niceLength
private int niceLength
goodLength
private int goodLength
comprFunc
private int comprFunc
- The current compression function.
inputBuf
private byte[] inputBuf
- The input data for compression.
totalIn
private int totalIn
- The total bytes of input read.
inputOff
private int inputOff
- The offset into inputBuf, where input data starts.
inputEnd
private int inputEnd
- The end offset of the input data.
pending
private DeflaterPending pending
huffman
private DeflaterHuffman huffman
adler
private Adler32 adler
- The adler checksum
DEBUGGING
public static final boolean DEBUGGING
- See Also:
- Constant Field Values
STORED_BLOCK
public static final int STORED_BLOCK
- See Also:
- Constant Field Values
STATIC_TREES
public static final int STATIC_TREES
- See Also:
- Constant Field Values
DYN_TREES
public static final int DYN_TREES
- See Also:
- Constant Field Values
PRESET_DICT
public static final int PRESET_DICT
- See Also:
- Constant Field Values
DEFAULT_MEM_LEVEL
public static final int DEFAULT_MEM_LEVEL
- See Also:
- Constant Field Values
MAX_MATCH
public static final int MAX_MATCH
- See Also:
- Constant Field Values
MIN_MATCH
public static final int MIN_MATCH
- See Also:
- Constant Field Values
MAX_WBITS
public static final int MAX_WBITS
- See Also:
- Constant Field Values
WSIZE
public static final int WSIZE
- See Also:
- Constant Field Values
WMASK
public static final int WMASK
- See Also:
- Constant Field Values
HASH_BITS
public static final int HASH_BITS
- See Also:
- Constant Field Values
HASH_SIZE
public static final int HASH_SIZE
- See Also:
- Constant Field Values
HASH_MASK
public static final int HASH_MASK
- See Also:
- Constant Field Values
HASH_SHIFT
public static final int HASH_SHIFT
- See Also:
- Constant Field Values
MIN_LOOKAHEAD
public static final int MIN_LOOKAHEAD
- See Also:
- Constant Field Values
MAX_DIST
public static final int MAX_DIST
- See Also:
- Constant Field Values
PENDING_BUF_SIZE
public static final int PENDING_BUF_SIZE
- See Also:
- Constant Field Values
MAX_BLOCK_SIZE
public static final int MAX_BLOCK_SIZE
DEFLATE_STORED
public static final int DEFLATE_STORED
- See Also:
- Constant Field Values
DEFLATE_FAST
public static final int DEFLATE_FAST
- See Also:
- Constant Field Values
DEFLATE_SLOW
public static final int DEFLATE_SLOW
- See Also:
- Constant Field Values
GOOD_LENGTH
public static final int[] GOOD_LENGTH
MAX_LAZY
public static final int[] MAX_LAZY
NICE_LENGTH
public static final int[] NICE_LENGTH
MAX_CHAIN
public static final int[] MAX_CHAIN
COMPR_FUNC
public static final int[] COMPR_FUNC
| Constructor Detail |
DeflaterEngine
DeflaterEngine(DeflaterPending pending)
| Method Detail |
reset
public void reset()
resetAdler
public final void resetAdler()
getAdler
public final int getAdler()
getTotalIn
public final int getTotalIn()
setStrategy
public final void setStrategy(int strat)
setLevel
public void setLevel(int lvl)
updateHash
private final void updateHash()
insertString
private final int insertString()
- Inserts the current string in the head hash and returns the previous
value for this hash.
slideWindow
private void slideWindow()
fillWindow
private void fillWindow()
- Fill the window when the lookahead becomes insufficient.
Updates strstart and lookahead.
OUT assertions: strstart + lookahead <= 2*WSIZE
lookahead >= MIN_LOOKAHEAD or inputOff == inputEnd
findLongestMatch
private boolean findLongestMatch(int curMatch)
- Find the best (longest) string in the window matching the
string starting at strstart.
Preconditions:
strstart + MAX_MATCH <= window.length.
setDictionary
void setDictionary(byte[] buffer,
int offset,
int length)
deflateStored
private boolean deflateStored(boolean flush,
boolean finish)
deflateFast
private boolean deflateFast(boolean flush,
boolean finish)
deflateSlow
private boolean deflateSlow(boolean flush,
boolean finish)
deflate
public boolean deflate(boolean flush,
boolean finish)
setInput
public void setInput(byte[] buf,
int off,
int len)
needsInput
public final boolean needsInput()
|
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| Home >> All >> ClassLib >> Common >> java >> util >> [ zip overview ] | PREV CLASS NEXT CLASS | ||||||||
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SUMMARY: JAVADOC | SOURCE | DOWNLOAD | NESTED | FIELD | CONSTR | METHOD |
DETAIL: FIELD | CONSTR | METHOD | ||||||||