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 // Encode a String into bytes String inputString = "blahblahblahÛÛ"; byte[]
50 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");
64 *java.util.zip.Inflater()*
68 Creates a new decompressor.
71 *java.util.zip.Inflater(boolean)*
73 public Inflater(boolean nowrap)
75 Creates a new decompressor. If the parameter 'nowrap' is true then the ZLIB
76 header and checksum fields will not be used. This provides compatibility with
77 the compression format used by both GZIP and PKZIP.
79 Note: When using the 'nowrap' option it is also necessary to provide an extra
80 "dummy" byte as input. This is required by the ZLIB native library in order to
81 support certain optimizations.
83 nowrap - if true then support GZIP compatible compression
85 *java.util.zip.Inflater.end()*
87 public synchronized void end()
89 Closes the decompressor and discards any unprocessed input. This method should
90 be called when the decompressor is no longer being used, but will also be
91 called automatically by the finalize() method. Once this method is called, the
92 behavior of the Inflater object is undefined.
95 *java.util.zip.Inflater.finalize()*
97 protected void finalize()
99 Closes the decompressor when garbage is collected.
102 *java.util.zip.Inflater.finished()*
104 public synchronized boolean finished()
106 Returns true if the end of the compressed data stream has been reached.
109 Returns: true if the end of the compressed data stream has been reached
110 *java.util.zip.Inflater.getAdler()*
112 public synchronized int getAdler()
114 Returns the ADLER-32 value of the uncompressed data.
117 Returns: the ADLER-32 value of the uncompressed data
118 *java.util.zip.Inflater.getBytesRead()*
120 public synchronized long getBytesRead()
122 Returns the total number of compressed bytes input so far.
125 Returns: the total (non-negative) number of compressed bytes input so far
126 *java.util.zip.Inflater.getBytesWritten()*
128 public synchronized long getBytesWritten()
130 Returns the total number of uncompressed bytes output so far.
133 Returns: the total (non-negative) number of uncompressed bytes output so far
134 *java.util.zip.Inflater.getRemaining()*
136 public synchronized int getRemaining()
138 Returns the total number of bytes remaining in the input buffer. This can be
139 used to find out what bytes still remain in the input buffer after
140 decompression has finished.
143 Returns: the total number of bytes remaining in the input buffer
144 *java.util.zip.Inflater.getTotalIn()*
146 public int getTotalIn()
148 Returns the total number of compressed bytes input so far.
150 Since the number of bytes may be greater than Integer.MAX_VALUE, the
151 (|java.util.zip.Inflater|) method is now the preferred means of obtaining this
155 Returns: the total number of compressed bytes input so far
156 *java.util.zip.Inflater.getTotalOut()*
158 public int getTotalOut()
160 Returns the total number of uncompressed bytes output so far.
162 Since the number of bytes may be greater than Integer.MAX_VALUE, the
163 (|java.util.zip.Inflater|) method is now the preferred means of obtaining this
167 Returns: the total number of uncompressed bytes output so far
168 *java.util.zip.Inflater.inflate(byte[])*
170 public int inflate(byte[] b)
171 throws |java.util.zip.DataFormatException|
173 Uncompresses bytes into specified buffer. Returns actual number of bytes
174 uncompressed. A return value of 0 indicates that needsInput() or
175 needsDictionary() should be called in order to determine if more input data or
176 a preset dictionary is required. In the later case, getAdler() can be used to
177 get the Adler-32 value of the dictionary required.
179 b - the buffer for the uncompressed data
181 Returns: the actual number of uncompressed bytes
182 *java.util.zip.Inflater.inflate(byte[],int,int)*
184 public synchronized int inflate(
188 throws |java.util.zip.DataFormatException|
190 Uncompresses bytes into specified buffer. Returns actual number of bytes
191 uncompressed. A return value of 0 indicates that needsInput() or
192 needsDictionary() should be called in order to determine if more input data or
193 a preset dictionary is required. In the later case, getAdler() can be used to
194 get the Adler-32 value of the dictionary required.
196 b - the buffer for the uncompressed data
197 off - the start offset of the data
198 len - the maximum number of uncompressed bytes
200 Returns: the actual number of uncompressed bytes
201 *java.util.zip.Inflater.needsDictionary()*
203 public synchronized boolean needsDictionary()
205 Returns true if a preset dictionary is needed for decompression.
208 Returns: true if a preset dictionary is needed for decompression
209 *java.util.zip.Inflater.needsInput()*
211 public synchronized boolean needsInput()
213 Returns true if no data remains in the input buffer. This can be used to
214 determine if #setInput should be called in order to provide more input.
217 Returns: true if no data remains in the input buffer
218 *java.util.zip.Inflater.reset()*
220 public synchronized void reset()
222 Resets inflater so that a new set of input data can be processed.
225 *java.util.zip.Inflater.setDictionary(byte[])*
227 public void setDictionary(byte[] b)
229 Sets the preset dictionary to the given array of bytes. Should be called when
230 inflate() returns 0 and needsDictionary() returns true indicating that a preset
231 dictionary is required. The method getAdler() can be used to get the Adler-32
232 value of the dictionary needed.
234 b - the dictionary data bytes
236 *java.util.zip.Inflater.setDictionary(byte[],int,int)*
238 public synchronized void setDictionary(
243 Sets the preset dictionary to the given array of bytes. Should be called when
244 inflate() returns 0 and needsDictionary() returns true indicating that a preset
245 dictionary is required. The method getAdler() can be used to get the Adler-32
246 value of the dictionary needed.
248 b - the dictionary data bytes
249 off - the start offset of the data
250 len - the length of the data
252 *java.util.zip.Inflater.setInput(byte[])*
254 public void setInput(byte[] b)
256 Sets input data for decompression. Should be called whenever needsInput()
257 returns true indicating that more input data is required.
259 b - the input data bytes
261 *java.util.zip.Inflater.setInput(byte[],int,int)*
263 public synchronized void setInput(
268 Sets input data for decompression. Should be called whenever needsInput()
269 returns true indicating that more input data is required.
271 b - the input data bytes
272 off - the start offset of the input data
273 len - the length of the input data