Class GZIPInputStream
java.lang.Object
java.io.InputStream
java.io.FilterInputStream
java.util.zip.InflaterInputStream
java.util.zip.GZIPInputStream
- All Implemented Interfaces:
- Closeable,- AutoCloseable
This class implements a stream filter for reading compressed data in
 the GZIP file format.
- Since:
- 1.1
- See Also:
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Field SummaryFieldsModifier and TypeFieldDescriptionprotected CRC32CRC-32 for uncompressed data.protected booleanIndicates end of input stream.static final intGZIP header magic number.Fields declared in class java.util.zip.InflaterInputStreambuf, inf, lenFields declared in class java.io.FilterInputStreamin
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Constructor SummaryConstructorsConstructorDescriptionCreates 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 SummaryMethods declared in class java.util.zip.InflaterInputStreamavailable, fill, mark, markSupported, read, reset, skipMethods declared in class java.io.FilterInputStreamreadMethods declared in class java.io.InputStreamnullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo
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Field Details- 
crcCRC-32 for uncompressed data.
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eosprotected boolean eosIndicates end of input stream.
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GZIP_MAGICpublic static final int GZIP_MAGICGZIP header magic number.- See Also:
 
 
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Constructor Details- 
GZIPInputStreamCreates a new input stream with the specified buffer size.- Parameters:
- in- the input stream
- size- the input buffer size
- Throws:
- ZipException- if a GZIP format error has occurred or the compression method used is unsupported
- NullPointerException- if- inis null
- IOException- if an I/O error has occurred
- IllegalArgumentException- if- size <= 0
 
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GZIPInputStreamCreates 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 unsupported
- NullPointerException- if- inis null
- IOException- if an I/O error has occurred
 
 
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Method Details- 
readReads uncompressed data into an array of bytes, returning the number of inflated bytes. Iflenis not zero, the method will block until some input can be decompressed; otherwise, no bytes are read and0is returned.If this method returns a nonzero integer n then buf[off]throughbuf[off+n-1]contain the uncompressed data. The content of elementsbuf[off+n]throughbuf[off+len-1]is undefined, contrary to the specification of theInputStreamsuperclass, so an implementation is free to modify these elements during the inflate operation. If this method returns-1or throws an exception then the content ofbuf[off]throughbuf[off+len-1]is undefined.- Overrides:
- readin class- InflaterInputStream
- Parameters:
- buf- the buffer into which the data is read
- off- the start offset in the destination array- buf
- len- the maximum number of bytes read
- Returns:
- the actual number of bytes inflated, or -1 if the end of the compressed input stream is reached
- Throws:
- NullPointerException- If- bufis- null.
- IndexOutOfBoundsException- If- offis negative,- lenis negative, or- lenis greater than- buf.length - off
- ZipException- if the compressed input data is corrupt.
- IOException- if an I/O error has occurred.
- See Also:
 
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closeCloses this input stream and releases any system resources associated with the stream.- Specified by:
- closein interface- AutoCloseable
- Specified by:
- closein interface- Closeable
- Overrides:
- closein class- InflaterInputStream
- Throws:
- IOException- if an I/O error has occurred
- See Also:
 
 
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