1 *java.util.zip.Inflater* *Inflater* This class provides support for general purp
4 extends |java.lang.Object|
6 |java.util.zip.Inflater_Description|
7 |java.util.zip.Inflater_Fields|
8 |java.util.zip.Inflater_Constructors|
9 |java.util.zip.Inflater_Methods|
11 ================================================================================
13 *java.util.zip.Inflater_Constructors*
14 |java.util.zip.Inflater()|Creates a new decompressor.
15 |java.util.zip.Inflater(boolean)|Creates a new decompressor.
17 *java.util.zip.Inflater_Methods*
18 |java.util.zip.Inflater.end()|Closes the decompressor and discards any unproces
19 |java.util.zip.Inflater.finalize()|Closes the decompressor when garbage is coll
20 |java.util.zip.Inflater.finished()|Returns true if the end of the compressed da
21 |java.util.zip.Inflater.getAdler()|Returns the ADLER-32 value of the uncompress
22 |java.util.zip.Inflater.getBytesRead()|Returns the total number of compressed b
23 |java.util.zip.Inflater.getBytesWritten()|Returns the total number of uncompres
24 |java.util.zip.Inflater.getRemaining()|Returns the total number of bytes remain
25 |java.util.zip.Inflater.getTotalIn()|Returns the total number of compressed byt
26 |java.util.zip.Inflater.getTotalOut()|Returns the total number of uncompressed
27 |java.util.zip.Inflater.inflate(byte[])|Uncompresses bytes into specified buffe
28 |java.util.zip.Inflater.inflate(byte[],int,int)|Uncompresses bytes into specifi
29 |java.util.zip.Inflater.needsDictionary()|Returns true if a preset dictionary i
30 |java.util.zip.Inflater.needsInput()|Returns true if no data remains in the inp
31 |java.util.zip.Inflater.reset()|Resets inflater so that a new set of input data
32 |java.util.zip.Inflater.setDictionary(byte[])|Sets the preset dictionary to the
33 |java.util.zip.Inflater.setDictionary(byte[],int,int)|Sets the preset dictionar
34 |java.util.zip.Inflater.setInput(byte[])|Sets input data for decompression.
35 |java.util.zip.Inflater.setInput(byte[],int,int)|Sets input data for decompress
37 *java.util.zip.Inflater_Description*
39 This class provides support for general purpose decompression using the popular
40 ZLIB compression library. The ZLIB compression library was initially developed
41 as part of the PNG graphics standard and is not protected by patents. It is
42 fully described in the specifications at the java.util.zip package description.
44 The following code fragment demonstrates a trivial compression and
45 decompression of a string using Deflater and Inflater.
49 try { // Encode a String into bytes String inputString = "blahblahblahÛÛ";
50 byte[] input = inputString.getBytes("UTF-8");
52 // Compress the bytes byte[] output = new byte[100]; Deflater compresser = new
53 Deflater(); compresser.setInput(input); compresser.finish(); int
54 compressedDataLength = compresser.deflate(output);
56 // Decompress the bytes Inflater decompresser = new Inflater();
57 decompresser.setInput(output, 0, compressedDataLength); byte[] result = new
58 byte[100]; int resultLength = decompresser.inflate(result); decompresser.end();
60 // Decode the bytes into a String String outputString = new String(result, 0,
61 resultLength, "UTF-8"); } catch(java.io.UnsupportedEncodingException ex) { //
62 handle } catch (java.util.zip.DataFormatException ex) { // handle }
66 *java.util.zip.Inflater()*
70 Creates a new decompressor.
73 *java.util.zip.Inflater(boolean)*
75 public Inflater(boolean nowrap)
77 Creates a new decompressor. If the parameter 'nowrap' is true then the ZLIB
78 header and checksum fields will not be used. This provides compatibility with
79 the compression format used by both GZIP and PKZIP.
81 Note: When using the 'nowrap' option it is also necessary to provide an extra
82 "dummy" byte as input. This is required by the ZLIB native library in order to
83 support certain optimizations.
85 nowrap - if true then support GZIP compatible compression
87 *java.util.zip.Inflater.end()*
89 public synchronized void end()
91 Closes the decompressor and discards any unprocessed input. This method should
92 be called when the decompressor is no longer being used, but will also be
93 called automatically by the finalize() method. Once this method is called, the
94 behavior of the Inflater object is undefined.
98 *java.util.zip.Inflater.finalize()*
100 protected void finalize()
102 Closes the decompressor when garbage is collected.
106 *java.util.zip.Inflater.finished()*
108 public synchronized boolean finished()
110 Returns true if the end of the compressed data stream has been reached.
114 Returns: true if the end of the compressed data stream has been reached
116 *java.util.zip.Inflater.getAdler()*
118 public synchronized int getAdler()
120 Returns the ADLER-32 value of the uncompressed data.
124 Returns: the ADLER-32 value of the uncompressed data
126 *java.util.zip.Inflater.getBytesRead()*
128 public synchronized long getBytesRead()
130 Returns the total number of compressed bytes input so far.
134 Returns: the total (non-negative) number of compressed bytes input so far
136 *java.util.zip.Inflater.getBytesWritten()*
138 public synchronized long getBytesWritten()
140 Returns the total number of uncompressed bytes output so far.
144 Returns: the total (non-negative) number of uncompressed bytes output so far
146 *java.util.zip.Inflater.getRemaining()*
148 public synchronized int getRemaining()
150 Returns the total number of bytes remaining in the input buffer. This can be
151 used to find out what bytes still remain in the input buffer after
152 decompression has finished.
156 Returns: the total number of bytes remaining in the input buffer
158 *java.util.zip.Inflater.getTotalIn()*
160 public int getTotalIn()
162 Returns the total number of compressed bytes input so far.
164 Since the number of bytes may be greater than Integer.MAX_VALUE, the
165 (|java.util.zip.Inflater|) method is now the preferred means of obtaining this
170 Returns: the total number of compressed bytes input so far
172 *java.util.zip.Inflater.getTotalOut()*
174 public int getTotalOut()
176 Returns the total number of uncompressed bytes output so far.
178 Since the number of bytes may be greater than Integer.MAX_VALUE, the
179 (|java.util.zip.Inflater|) method is now the preferred means of obtaining this
184 Returns: the total number of uncompressed bytes output so far
186 *java.util.zip.Inflater.inflate(byte[])*
188 public int inflate(byte[] b)
189 throws |java.util.zip.DataFormatException|
191 Uncompresses bytes into specified buffer. Returns actual number of bytes
192 uncompressed. A return value of 0 indicates that needsInput() or
193 needsDictionary() should be called in order to determine if more input data or
194 a preset dictionary is required. In the latter case, getAdler() can be used to
195 get the Adler-32 value of the dictionary required.
198 b - the buffer for the uncompressed data
200 Returns: the actual number of uncompressed bytes
202 *java.util.zip.Inflater.inflate(byte[],int,int)*
204 public synchronized int inflate(
208 throws |java.util.zip.DataFormatException|
210 Uncompresses bytes into specified buffer. Returns actual number of bytes
211 uncompressed. A return value of 0 indicates that needsInput() or
212 needsDictionary() should be called in order to determine if more input data or
213 a preset dictionary is required. In the latter case, getAdler() can be used to
214 get the Adler-32 value of the dictionary required.
217 b - the buffer for the uncompressed data
218 off - the start offset of the data
219 len - the maximum number of uncompressed bytes
221 Returns: the actual number of uncompressed bytes
223 *java.util.zip.Inflater.needsDictionary()*
225 public synchronized boolean needsDictionary()
227 Returns true if a preset dictionary is needed for decompression.
231 Returns: true if a preset dictionary is needed for decompression
233 *java.util.zip.Inflater.needsInput()*
235 public synchronized boolean needsInput()
237 Returns true if no data remains in the input buffer. This can be used to
238 determine if #setInput should be called in order to provide more input.
242 Returns: true if no data remains in the input buffer
244 *java.util.zip.Inflater.reset()*
246 public synchronized void reset()
248 Resets inflater so that a new set of input data can be processed.
252 *java.util.zip.Inflater.setDictionary(byte[])*
254 public void setDictionary(byte[] b)
256 Sets the preset dictionary to the given array of bytes. Should be called when
257 inflate() returns 0 and needsDictionary() returns true indicating that a preset
258 dictionary is required. The method getAdler() can be used to get the Adler-32
259 value of the dictionary needed.
262 b - the dictionary data bytes
264 *java.util.zip.Inflater.setDictionary(byte[],int,int)*
266 public synchronized void setDictionary(
271 Sets the preset dictionary to the given array of bytes. Should be called when
272 inflate() returns 0 and needsDictionary() returns true indicating that a preset
273 dictionary is required. The method getAdler() can be used to get the Adler-32
274 value of the dictionary needed.
277 b - the dictionary data bytes
278 off - the start offset of the data
279 len - the length of the data
281 *java.util.zip.Inflater.setInput(byte[])*
283 public void setInput(byte[] b)
285 Sets input data for decompression. Should be called whenever needsInput()
286 returns true indicating that more input data is required.
289 b - the input data bytes
291 *java.util.zip.Inflater.setInput(byte[],int,int)*
293 public synchronized void setInput(
298 Sets input data for decompression. Should be called whenever needsInput()
299 returns true indicating that more input data is required.
302 b - the input data bytes
303 off - the start offset of the input data
304 len - the length of the input data