- 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.- See Also:
Inflater
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Field Summary
Fields Modifier and Type Field and Description protected byte[]
buf
Input buffer for decompression.protected Inflater
inf
Decompressor for this stream.protected int
len
Length of input buffer.-
Fields inherited from class java.io.FilterInputStream
in
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Constructor Summary
Constructors Constructor and 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
Methods Modifier and Type Method and Description int
available()
Returns 0 after EOF has been reached, otherwise always return 1.void
close()
Closes this input stream and releases any system resources associated with the stream.protected void
fill()
Fills input buffer with more data to decompress.void
mark(int readlimit)
Marks the current position in this input stream.boolean
markSupported()
Tests if this input stream supports themark
andreset
methods.int
read()
Reads a byte of uncompressed data.int
read(byte[] b, int off, int len)
Reads uncompressed data into an array of bytes.void
reset()
Repositions this stream to the position at the time themark
method was last called on this input stream.long
skip(long n)
Skips specified number of bytes of uncompressed data.-
Methods inherited from class java.io.FilterInputStream
read
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Field Detail
-
inf
protected Inflater inf
Decompressor for this stream.
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buf
protected byte[] buf
Input buffer for decompression.
-
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
- if size is <= 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
-
read
public int read() throws IOException
Reads a byte of uncompressed data. This method will block until enough input is available for decompression.- Overrides:
read
in 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 IOException
Reads uncompressed data into an array of bytes. Iflen
is not zero, the method will block until some input can be decompressed; otherwise, no bytes are read and0
is returned.- Overrides:
read
in classFilterInputStream
- Parameters:
b
- the buffer into which the data is readoff
- the start offset in the destination arrayb
len
- 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
- Ifb
isnull
.IndexOutOfBoundsException
- Ifoff
is negative,len
is negative, orlen
is greater thanb.length - off
ZipException
- 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 IOException
Returns 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:
available
in 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 IOException
Skips specified number of bytes of uncompressed data.- Overrides:
skip
in 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
- if n < 0
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close
public void close() throws IOException
Closes this input stream and releases any system resources associated with the stream.- Specified by:
close
in interfaceCloseable
- Specified by:
close
in interfaceAutoCloseable
- Overrides:
close
in classFilterInputStream
- Throws:
IOException
- if an I/O error has occurred- See Also:
FilterInputStream.in
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fill
protected void fill() throws IOException
Fills 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 themark
andreset
methods. ThemarkSupported
method ofInflaterInputStream
returnsfalse
.- Overrides:
markSupported
in classFilterInputStream
- Returns:
- a
boolean
indicating if this stream type supports themark
andreset
methods. - 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
mark
method ofInflaterInputStream
does nothing.- Overrides:
mark
in 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 IOException
Repositions this stream to the position at the time themark
method was last called on this input stream.The method
reset
for classInflaterInputStream
does nothing except throw anIOException
.- Overrides:
reset
in classFilterInputStream
- Throws:
IOException
- if this method is invoked.- See Also:
InputStream.mark(int)
,IOException
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