java.lang.Object
java.io.InputStream
java.io.FilterInputStream
java.util.zip.DeflaterInputStream
- All Implemented Interfaces:
Closeable
,AutoCloseable
Implements an input stream filter for compressing data in the "deflate"
compression format.
- Since:
- 1.6
- See Also:
-
Field Summary
Modifier and TypeFieldDescriptionprotected final byte[]
Input buffer for reading compressed data.protected final Deflater
Compressor for this stream.Fields declared in class java.io.FilterInputStream
in
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Constructor Summary
ConstructorDescriptionCreates a new input stream with a default compressor and buffer size.DeflaterInputStream
(InputStream in, Deflater defl) Creates a new input stream with the specified compressor and a default buffer size.DeflaterInputStream
(InputStream in, Deflater defl, int bufLen) Creates a new input stream with the specified compressor and buffer size. -
Method Summary
Modifier and TypeMethodDescriptionint
Returns 0 after EOF has been reached, otherwise always return 1.void
close()
Closes this input stream and its underlying input stream, discarding any pending uncompressed data.void
mark
(int limit) This operation is not supported.boolean
int
read()
Reads a single byte of compressed data from the input stream.int
read
(byte[] b, int off, int len) Reads compressed data into a byte array.void
reset()
This operation is not supported.long
skip
(long n) Skips over and discards data from the input stream.Methods declared in class java.io.FilterInputStream
read
Methods declared in class java.io.InputStream
nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo
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Field Details
-
def
Compressor for this stream. -
buf
protected final byte[] bufInput buffer for reading compressed data.
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-
Constructor Details
-
DeflaterInputStream
Creates a new input stream with a default compressor and buffer size.- Parameters:
in
- input stream to read the uncompressed data to- Throws:
NullPointerException
- ifin
is null
-
DeflaterInputStream
Creates a new input stream with the specified compressor and a default buffer size.- Parameters:
in
- input stream to read the uncompressed data todefl
- compressor ("deflater") for this stream- Throws:
NullPointerException
- ifin
ordefl
is null
-
DeflaterInputStream
Creates a new input stream with the specified compressor and buffer size.- Parameters:
in
- input stream to read the uncompressed data todefl
- compressor ("deflater") for this streambufLen
- compression buffer size- Throws:
IllegalArgumentException
- ifbufLen <= 0
NullPointerException
- ifin
ordefl
is null
-
-
Method Details
-
close
Closes this input stream and its underlying input stream, discarding any pending uncompressed data.- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceCloseable
- Overrides:
close
in classFilterInputStream
- Throws:
IOException
- if an I/O error occurs- See Also:
-
read
Reads a single byte of compressed data from the input stream. This method will block until some input can be read and compressed.- Overrides:
read
in classFilterInputStream
- Returns:
- a single byte of compressed data, or -1 if the end of the uncompressed input stream is reached
- Throws:
IOException
- if an I/O error occurs or if this stream is already closed- See Also:
-
read
Reads compressed data into a byte array. This method will block until some input can be read and compressed.- Overrides:
read
in classFilterInputStream
- Parameters:
b
- buffer into which the data is readoff
- starting offset of the data withinb
len
- maximum number of compressed bytes to read intob
- Returns:
- the actual number of bytes read, or -1 if the end of the uncompressed input stream is reached
- Throws:
IndexOutOfBoundsException
- iflen > b.length - off
IOException
- if an I/O error occurs or if this input stream is already closed- See Also:
-
skip
Skips over and discards data from the input stream. This method may block until the specified number of bytes are read and skipped. Note: Whilen
is given as along
, the maximum number of bytes which can be skipped isInteger.MAX_VALUE
.- Overrides:
skip
in classFilterInputStream
- Parameters:
n
- number of bytes to be skipped- Returns:
- the actual number of bytes skipped
- Throws:
IOException
- if an I/O error occurs or if this stream is already closed- See Also:
-
available
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 classFilterInputStream
- Returns:
- zero after the end of the underlying input stream has been reached, otherwise always returns 1
- Throws:
IOException
- if an I/O error occurs or if this stream is already closed
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markSupported
public boolean markSupported()- Overrides:
markSupported
in classFilterInputStream
- Returns:
- false, always
- See Also:
-
mark
public void mark(int limit) This operation is not supported.- Overrides:
mark
in classFilterInputStream
- Parameters:
limit
- maximum bytes that can be read before invalidating the position marker- See Also:
-
reset
This operation is not supported.- Overrides:
reset
in classFilterInputStream
- Throws:
IOException
- always thrown- See Also:
-