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java.lang.Object org.apache.hadoop.io.compress.zlib.ZlibDecompressor
public class ZlibDecompressor
A Decompressor
based on the popular
zlib compression algorithm.
http://www.zlib.net/
Nested Class Summary | |
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static class |
ZlibDecompressor.CompressionHeader
The headers to detect from compressed data. |
Constructor Summary | |
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ZlibDecompressor()
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ZlibDecompressor(ZlibDecompressor.CompressionHeader header,
int directBufferSize)
Creates a new decompressor. |
Method Summary | |
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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 compressed data output stream has been reached. |
long |
getBytesRead()
Returns the total number of uncompressed bytes input so far. |
long |
getBytesWritten()
Returns the total number of compressed bytes output so far. |
boolean |
needsDictionary()
Returns true if a preset dictionary is needed for decompression. |
boolean |
needsInput()
Returns true if the input data buffer is empty and #setInput() should be called to provide more input. |
void |
reset()
Resets decompressor so that a new set of input data can be processed. |
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. |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ZlibDecompressor(ZlibDecompressor.CompressionHeader header, int directBufferSize)
public ZlibDecompressor()
Method Detail |
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public void setInput(byte[] b, int off, int len)
Decompressor
true
indicating that more input data is required.
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
needsInput
in interface Decompressor
true
if the input data buffer is empty and
#setInput() 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
finished
in interface Decompressor
true
if the end of the compressed
data output stream has been reached.public int decompress(byte[] b, int off, int len) throws IOException
Decompressor
decompress
in interface Decompressor
b
- Buffer for the compressed dataoff
- Start offset of the datalen
- Size of the buffer
IOException
public long getBytesWritten()
public long getBytesRead()
public void reset()
Decompressor
reset
in interface Decompressor
public void end()
Decompressor
end
in interface Decompressor
protected void finalize()
finalize
in class Object
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