java.lang.Object
java.io.InputStream
java.io.FilterInputStream
java.util.zip.InflaterInputStream
- All Implemented Interfaces:
- Closeable,- AutoCloseable
- Direct Known Subclasses:
- GZIPInputStream,- ZipInputStream
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:
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Field SummaryFieldsModifier and TypeFieldDescriptionprotected byte[]Input buffer for decompression.protected InflaterDecompressor for this stream.protected intThe total number of bytes read into the input buffer.Fields declared in class java.io.FilterInputStreamin
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Constructor SummaryConstructorsConstructorDescriptionCreates 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 SummaryModifier and TypeMethodDescriptionintReturns 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.booleanTests 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, returning the number of inflated 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.FilterInputStreamreadMethods declared in class java.io.InputStreamnullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo
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Field Details- 
infDecompressor for this stream.
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bufprotected byte[] bufInput buffer for decompression.
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lenprotected int lenThe total number of bytes read into the input buffer.
 
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Constructor Details- 
InflaterInputStreamCreates a new input stream with the specified decompressor and buffer size.- Parameters:
- in- the input stream
- inf- the decompressor ("inflater")
- size- the input buffer size
- Throws:
- IllegalArgumentException- if- size <= 0
 
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InflaterInputStreamCreates a new input stream with the specified decompressor and a default buffer size.- Parameters:
- in- the input stream
- inf- the decompressor ("inflater")
 
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InflaterInputStreamCreates a new input stream with a default decompressor and buffer size.- Parameters:
- in- the input stream
 
 
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Method Details- 
readReads a byte of uncompressed data. This method will block until enough input is available for decompression.- Overrides:
- readin class- FilterInputStream
- Returns:
- the byte read, or -1 if end of compressed input is reached
- Throws:
- IOException- if an I/O error has occurred
- See Also:
 
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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- FilterInputStream
- Parameters:
- b- the buffer into which the data is read
- off- the start offset in the destination array- b
- len- the maximum number of bytes read
- Returns:
- the actual number of bytes inflated, or -1 if the end of the compressed input is reached or a preset dictionary is needed
- Throws:
- NullPointerException- If- bis- null.
- IndexOutOfBoundsException- If- offis negative,- lenis negative, or- lenis greater than- b.length - off
- ZipException- if a ZIP format error has occurred
- IOException- if an I/O error has occurred
- See Also:
 
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availableReturns 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 class- FilterInputStream
- Returns:
- 1 before EOF and 0 after EOF.
- Throws:
- IOException- if an I/O error occurs.
 
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skipSkips specified number of bytes of uncompressed data.- Overrides:
- skipin class- FilterInputStream
- Parameters:
- n- the number of bytes to skip
- Returns:
- the actual number of bytes skipped.
- Throws:
- IOException- if an I/O error has occurred
- IllegalArgumentException- if- n < 0
- 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- FilterInputStream
- Throws:
- IOException- if an I/O error has occurred
- See Also:
 
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fillFills input buffer with more data to decompress.- Implementation Requirements:
- This method will read up to buf.length bytes into the input buffer,buf, starting at element0. Thelenfield will be set to the number of bytes read.
- Throws:
- IOException- if an I/O error has occurred
- EOFException- if the end of input stream has been reached unexpectedly
 
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markSupportedpublic boolean markSupported()Tests if this input stream supports themarkandresetmethods. ThemarkSupportedmethod ofInflaterInputStreamreturnsfalse.- Overrides:
- markSupportedin class- FilterInputStream
- Returns:
- a booleanindicating if this stream type supports themarkandresetmethods.
- See Also:
 
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markpublic void mark(int readlimit) Marks the current position in this input stream.- Overrides:
- markin class- FilterInputStream
- Implementation Requirements:
- The markmethod ofInflaterInputStreamdoes nothing.
- Parameters:
- readlimit- the maximum limit of bytes that can be read before the mark position becomes invalid.
- See Also:
 
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resetRepositions this stream to the position at the time themarkmethod was last called on this input stream.- Overrides:
- resetin class- FilterInputStream
- Implementation Requirements:
- The method resetfor classInflaterInputStreamdoes nothing except throw anIOException.
- Throws:
- IOException- if this method is invoked.
- See Also:
 
 
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