- java.lang.Object
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- java.io.InputStream
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- java.io.FilterInputStream
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- java.util.zip.InflaterInputStream
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- All Implemented Interfaces:
Closeable,AutoCloseable
- Direct Known Subclasses:
GZIPInputStream,ZipInputStream
public class InflaterInputStream extends FilterInputStream
This class implements a stream filter for uncompressing data in the "deflate" compression format. It is also used as the basis for other decompression filters, such as GZIPInputStream.- Since:
- 1.1
- See Also:
Inflater
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Constructor Summary
Constructors Constructor Description InflaterInputStream(InputStream in)Creates a new input stream with a default decompressor and buffer size.InflaterInputStream(InputStream in, Inflater inf)Creates a new input stream with the specified decompressor and a default buffer size.InflaterInputStream(InputStream in, Inflater inf, int size)Creates a new input stream with the specified decompressor and buffer size.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description intavailable()Returns 0 after EOF has been reached, otherwise always return 1.voidclose()Closes this input stream and releases any system resources associated with the stream.protected voidfill()Fills input buffer with more data to decompress.voidmark(int readlimit)Marks the current position in this input stream.booleanmarkSupported()Tests if this input stream supports themarkandresetmethods.intread()Reads a byte of uncompressed data.intread(byte[] b, int off, int len)Reads uncompressed data into an array of bytes.voidreset()Repositions this stream to the position at the time themarkmethod was last called on this input stream.longskip(long n)Skips specified number of bytes of uncompressed data.-
Methods declared in class java.io.FilterInputStream
read
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Methods declared in class java.io.InputStream
nullInputStream, readAllBytes, readNBytes, readNBytes, transferTo
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Field Detail
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inf
protected Inflater inf
Decompressor for this stream.
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buf
protected byte[] buf
Input buffer for decompression.
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len
protected int len
Length of input buffer.
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Constructor Detail
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InflaterInputStream
public InflaterInputStream(InputStream in, Inflater inf, int size)
Creates a new input stream with the specified decompressor and buffer size.- Parameters:
in- the input streaminf- the decompressor ("inflater")size- the input buffer size- Throws:
IllegalArgumentException- ifsize <= 0
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InflaterInputStream
public InflaterInputStream(InputStream in, Inflater inf)
Creates a new input stream with the specified decompressor and a default buffer size.- Parameters:
in- the input streaminf- the decompressor ("inflater")
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InflaterInputStream
public InflaterInputStream(InputStream in)
Creates a new input stream with a default decompressor and buffer size.- Parameters:
in- the input stream
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Method Detail
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read
public int read() throws IOExceptionReads a byte of uncompressed data. This method will block until enough input is available for decompression.- Overrides:
readin classFilterInputStream- Returns:
- the byte read, or -1 if end of compressed input is reached
- Throws:
IOException- if an I/O error has occurred- See Also:
FilterInputStream.in
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read
public int read(byte[] b, int off, int len) throws IOExceptionReads uncompressed data into an array of bytes. Iflenis not zero, the method will block until some input can be decompressed; otherwise, no bytes are read and0is returned.- Overrides:
readin classFilterInputStream- Parameters:
b- the buffer into which the data is readoff- the start offset in the destination arrayblen- the maximum number of bytes read- Returns:
- the actual number of bytes read, or -1 if the end of the compressed input is reached or a preset dictionary is needed
- Throws:
NullPointerException- Ifbisnull.IndexOutOfBoundsException- Ifoffis negative,lenis negative, orlenis greater thanb.length - offZipException- if a ZIP format error has occurredIOException- if an I/O error has occurred- See Also:
FilterInputStream.in
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available
public int available() throws IOExceptionReturns 0 after EOF has been reached, otherwise always return 1.Programs should not count on this method to return the actual number of bytes that could be read without blocking.
- Overrides:
availablein classFilterInputStream- Returns:
- 1 before EOF and 0 after EOF.
- Throws:
IOException- if an I/O error occurs.
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skip
public long skip(long n) throws IOExceptionSkips specified number of bytes of uncompressed data.- Overrides:
skipin classFilterInputStream- Parameters:
n- the number of bytes to skip- Returns:
- the actual number of bytes skipped.
- Throws:
IOException- if an I/O error has occurredIllegalArgumentException- ifn < 0
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close
public void close() throws IOExceptionCloses this input stream and releases any system resources associated with the stream.- Specified by:
closein interfaceAutoCloseable- Specified by:
closein interfaceCloseable- Overrides:
closein classFilterInputStream- Throws:
IOException- if an I/O error has occurred- See Also:
FilterInputStream.in
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fill
protected void fill() throws IOExceptionFills input buffer with more data to decompress.- Throws:
IOException- if an I/O error has occurred
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markSupported
public boolean markSupported()
Tests if this input stream supports themarkandresetmethods. ThemarkSupportedmethod ofInflaterInputStreamreturnsfalse.- Overrides:
markSupportedin classFilterInputStream- Returns:
- a
booleanindicating if this stream type supports themarkandresetmethods. - See Also:
InputStream.mark(int),InputStream.reset()
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mark
public void mark(int readlimit)
Marks the current position in this input stream.The
markmethod ofInflaterInputStreamdoes nothing.- Overrides:
markin classFilterInputStream- Parameters:
readlimit- the maximum limit of bytes that can be read before the mark position becomes invalid.- See Also:
InputStream.reset()
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reset
public void reset() throws IOExceptionRepositions this stream to the position at the time themarkmethod was last called on this input stream.The method
resetfor classInflaterInputStreamdoes nothing except throw anIOException.- Overrides:
resetin classFilterInputStream- Throws:
IOException- if this method is invoked.- See Also:
InputStream.mark(int),IOException
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