- 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.- Since:
- 1.1
- See Also:
InflaterInputStream
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Field Summary
Fields Modifier and Type Field Description protected CRC32crcCRC-32 for uncompressed data.protected booleaneosIndicates end of input stream.static intGZIP_MAGICGZIP header magic number.-
Fields declared in class java.util.zip.InflaterInputStream
buf, inf, len
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Fields declared in class java.io.FilterInputStream
in
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Constructor Summary
Constructors Constructor 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
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidclose()Closes this input stream and releases any system resources associated with the stream.intread(byte[] buf, int off, int len)Reads uncompressed data into an array of bytes.-
Methods declared in class java.util.zip.InflaterInputStream
available, fill, mark, markSupported, read, reset, skip
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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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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- ifsize <= 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 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 classInflaterInputStream- Parameters:
buf- 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 stream is reached
- Throws:
NullPointerException- Ifbufisnull.IndexOutOfBoundsException- Ifoffis negative,lenis negative, orlenis greater thanbuf.length - offZipException- 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 IOExceptionCloses this input stream and releases any system resources associated with the stream.- Specified by:
closein interfaceAutoCloseable- Specified by:
closein interfaceCloseable- Overrides:
closein classInflaterInputStream- Throws:
IOException- if an I/O error has occurred- See Also:
FilterInputStream.in
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