- 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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- java.util.zip.GZIPInputStream
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- All Implemented Interfaces:
- Closeable, AutoCloseable
public class GZIPInputStream extends InflaterInputStream
This class implements a stream filter for reading compressed data in the GZIP file format.- See Also:
InflaterInputStream
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Field Summary
Fields Modifier and Type Field and Description protected CRC32
crc
CRC-32 for uncompressed data.protected boolean
eos
Indicates end of input stream.static int
GZIP_MAGIC
GZIP header magic number.-
Fields inherited from class java.io.FilterInputStream
in
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Constructor Summary
Constructors Constructor and Description GZIPInputStream(InputStream in)
Creates a new input stream with a default buffer size.GZIPInputStream(InputStream in, int size)
Creates a new input stream with the specified buffer size.
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Method Summary
Methods Modifier and Type Method and Description void
close()
Closes this input stream and releases any system resources associated with the stream.int
read(byte[] buf, int off, int len)
Reads uncompressed data into an array of bytes.-
Methods inherited from class java.util.zip.InflaterInputStream
available, fill, mark, markSupported, read, reset, skip
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Methods inherited from class java.io.FilterInputStream
read
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Field Detail
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crc
protected CRC32 crc
CRC-32 for uncompressed data.
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eos
protected boolean eos
Indicates end of input stream.
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GZIP_MAGIC
public static final int GZIP_MAGIC
GZIP header magic number.- See Also:
- Constant Field Values
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Constructor Detail
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GZIPInputStream
public GZIPInputStream(InputStream in, int size) throws IOException
Creates a new input stream with the specified buffer size.- Parameters:
in
- the input streamsize
- the input buffer size- Throws:
ZipException
- if a GZIP format error has occurred or the compression method used is unsupportedIOException
- if an I/O error has occurredIllegalArgumentException
- if size is <= 0
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GZIPInputStream
public GZIPInputStream(InputStream in) throws IOException
Creates a new input stream with a default buffer size.- Parameters:
in
- the input stream- Throws:
ZipException
- if a GZIP format error has occurred or the compression method used is unsupportedIOException
- if an I/O error has occurred
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Method Detail
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read
public int read(byte[] buf, 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 classInflaterInputStream
- Parameters:
buf
- 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 stream is reached
- Throws:
NullPointerException
- Ifbuf
isnull
.IndexOutOfBoundsException
- Ifoff
is negative,len
is negative, orlen
is greater thanbuf.length - off
ZipException
- if the compressed input data is corrupt.IOException
- if an I/O error has occurred.- See Also:
FilterInputStream.in
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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 classInflaterInputStream
- Throws:
IOException
- if an I/O error has occurred- See Also:
FilterInputStream.in
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