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/OpenJDK 21

Class InflaterInputStream

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.
Since:
1.1
See Also:

Field Summary

Modifier and Type Field Description
protected byte[] buf
Input buffer for decompression.
protected Inflater inf
Decompressor for this stream.
protected int len
The total number of bytes read into the input buffer.

Fields declared in class java.io.FilterInputStream

in

Constructor Summary

Constructor 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.

Method Summary

Modifier and Type Method 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 the mark and reset 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, returning the number of inflated bytes.
void reset()
Repositions this stream to the position at the time the mark method was last called on this input stream.
long skip(long n)
Skips specified number of bytes of uncompressed data.

Methods declared in class java.io.FilterInputStream

read

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

inf

protected Inflater inf
Decompressor for this stream.

buf

protected byte[] buf
Input buffer for decompression.

len

protected int len
The total number of bytes read into the input buffer.

Constructor Details

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 stream
inf - the decompressor ("inflater")
size - the input buffer size
Throws:
IllegalArgumentException - if size <= 0

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 stream
inf - the decompressor ("inflater")

InflaterInputStream

public InflaterInputStream(InputStream in)
Creates a new input stream with a default decompressor and buffer size.
Parameters:
in - the input stream

Method Details

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 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:

read

public int read(byte[] b, int off, int len) throws IOException
Reads uncompressed data into an array of bytes, returning the number of inflated bytes. If len is not zero, the method will block until some input can be decompressed; otherwise, no bytes are read and 0 is returned.

If this method returns a nonzero integer n then buf[off] through buf[off+n-1] contain the uncompressed data. The content of elements buf[off+n] through buf[off+len-1] is undefined, contrary to the specification of the InputStream superclass, so an implementation is free to modify these elements during the inflate operation. If this method returns -1 or throws an exception then the content of buf[off] through buf[off+len -1] is undefined.

Overrides:
read in 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 b is null.
IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off
ZipException - if a ZIP format error has occurred
IOException - if an I/O error has occurred
See Also:

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 class FilterInputStream
Returns:
1 before EOF and 0 after EOF.
Throws:
IOException - if an I/O error occurs.

skip

public long skip(long n) throws IOException
Skips specified number of bytes of uncompressed data.
Overrides:
skip in 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:

close

public void close() throws IOException
Closes this input stream and releases any system resources associated with the stream.
Specified by:
close in interface AutoCloseable
Specified by:
close in interface Closeable
Overrides:
close in class FilterInputStream
Throws:
IOException - if an I/O error has occurred
See Also:

fill

protected void fill() throws IOException
Fills 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 element 0. The len field 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

markSupported

public boolean markSupported()
Tests if this input stream supports the mark and reset methods. The markSupported method of InflaterInputStream returns false.
Overrides:
markSupported in class FilterInputStream
Returns:
a boolean indicating if this stream type supports the mark and reset methods.
See Also:

mark

public void mark(int readlimit)
Marks the current position in this input stream.
Overrides:
mark in class FilterInputStream
Implementation Requirements:
The mark method of InflaterInputStream does nothing.
Parameters:
readlimit - the maximum limit of bytes that can be read before the mark position becomes invalid.
See Also:

reset

public void reset() throws IOException
Repositions this stream to the position at the time the mark method was last called on this input stream.
Overrides:
reset in class FilterInputStream
Implementation Requirements:
The method reset for class InflaterInputStream does nothing except throw an IOException.
Throws:
IOException - if this method is invoked.
See Also:

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/zip/InflaterInputStream.html