public class ZlibDecompressor extends Object implements Decompressor
Decompressor
based on the popular
zlib compression algorithm.
http://www.zlib.net/Modifier and Type | Class and Description |
---|---|
static class |
ZlibDecompressor.CompressionHeader
The headers to detect from compressed data.
|
Constructor and Description |
---|
ZlibDecompressor() |
ZlibDecompressor(ZlibDecompressor.CompressionHeader header,
int directBufferSize)
Creates a new decompressor.
|
Modifier and Type | Method and Description |
---|---|
int |
decompress(byte[] b,
int off,
int len)
Fills specified buffer with uncompressed data.
|
void |
end()
Closes the decompressor and discards any unprocessed input.
|
protected void |
finalize() |
boolean |
finished()
Returns
true if the end of the decompressed
data output stream has been reached. |
long |
getBytesRead()
Returns the total number of compressed bytes input so far.
|
long |
getBytesWritten()
Returns the total number of uncompressed bytes output so far.
|
int |
getRemaining()
Returns the number of bytes remaining in the input buffers; normally
called when finished() is true to determine amount of post-gzip-stream
data.
|
boolean |
needsDictionary()
Returns
true if a preset dictionary is needed for decompression. |
boolean |
needsInput()
Returns
true if the input data buffer is empty and
Decompressor.setInput(byte[], int, int) should be called to
provide more input. |
void |
reset()
Resets everything including the input buffers (user and direct).
|
void |
setDictionary(byte[] b,
int off,
int len)
Sets preset dictionary for compression.
|
void |
setInput(byte[] b,
int off,
int len)
Sets input data for decompression.
|
public ZlibDecompressor(ZlibDecompressor.CompressionHeader header, int directBufferSize)
public ZlibDecompressor()
public void setInput(byte[] b, int off, int len)
Decompressor
Decompressor.needsInput()
returns
true
indicating that more input data is required.
(Both native and non-native versions of various Decompressors require
that the data passed in via b[]
remain unmodified until
the caller is explicitly notified--via Decompressor.needsInput()
--that the
buffer may be safely modified. With this requirement, an extra
buffer-copy can be avoided.)setInput
in interface Decompressor
b
- Input dataoff
- Start offsetlen
- Lengthpublic void setDictionary(byte[] b, int off, int len)
Decompressor
setDictionary
in interface Decompressor
b
- Dictionary data bytesoff
- Start offsetlen
- Lengthpublic boolean needsInput()
Decompressor
true
if the input data buffer is empty and
Decompressor.setInput(byte[], int, int)
should be called to
provide more input.needsInput
in interface Decompressor
true
if the input data buffer is empty and
Decompressor.setInput(byte[], int, int)
should be called in
order to provide more input.public boolean needsDictionary()
Decompressor
true
if a preset dictionary is needed for decompression.needsDictionary
in interface Decompressor
true
if a preset dictionary is needed for decompressionpublic boolean finished()
Decompressor
true
if the end of the decompressed
data output stream has been reached. Indicates a concatenated data stream
when finished() returns true
and Decompressor.getRemaining()
returns a positive value. finished() will be reset with the
Decompressor.reset()
method.finished
in interface Decompressor
true
if the end of the decompressed
data output stream has been reached.public int decompress(byte[] b, int off, int len) throws IOException
Decompressor
Decompressor.needsInput()
should be called in order to determine if more
input data is required.decompress
in interface Decompressor
b
- Buffer for the compressed dataoff
- Start offset of the datalen
- Size of the bufferIOException
public long getBytesWritten()
public long getBytesRead()
public int getRemaining()
getRemaining
in interface Decompressor
public void reset()
reset
in interface Decompressor
public void end()
Decompressor
end
in interface Decompressor
Copyright © 2013 Apache Software Foundation. All rights reserved.