Java compact1, compact2, compact3 java.util.zip Class DeflaterInputStream（JDK8）

Field Detail

• def

  protected final Deflater def

  Compressor for this stream.

• buf

  protected final byte[] buf

  Input buffer for reading compressed data.

Constructor Detail

• DeflaterInputStream

  public DeflaterInputStream(InputStream in)

  Creates a new input stream with a default compressor and buffer size.

  Parameters:

  in - input stream to read the uncompressed data to

  Throws:

  NullPointerException - if in is null

• DeflaterInputStream

  public DeflaterInputStream(InputStream in,
                             Deflater defl)

  Creates a new input stream with the specified compressor and a default buffer size.

  Parameters:

  in - input stream to read the uncompressed data to

  defl - compressor ("deflater") for this stream

  Throws:

  NullPointerException - if in or defl is null

• DeflaterInputStream

  public DeflaterInputStream(InputStream in,
                             Deflater defl,
                             int bufLen)

  Creates a new input stream with the specified compressor and buffer size.

  Parameters:

  in - input stream to read the uncompressed data to

  defl - compressor ("deflater") for this stream

  bufLen - compression buffer size

  Throws:

  IllegalArgumentException - if bufLen <= 0

  NullPointerException - if in or defl is null

Method Detail

• close

  public void close()
             throws IOException

  Closes this input stream and its underlying input stream, discarding any pending uncompressed data.

  Specified by:

  close in interface Closeable

  Specified by:

  close in interface AutoCloseable

  Overrides:

  close in class FilterInputStream

  Throws:

  IOException - if an I/O error occurs

  See Also:

  FilterInputStream.in

• read

  public int read()
           throws IOException

  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 class FilterInputStream

  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:

  FilterInputStream.in

• read

  public int read(byte[] b,
                  int off,
                  int len)
           throws IOException

  Reads compressed data into a byte array. This method will block until some input can be read and compressed.

  Overrides:

  read in class FilterInputStream

  Parameters:

  b - buffer into which the data is read

  off - starting offset of the data within b

  len - maximum number of compressed bytes to read into b

  Returns:

  the actual number of bytes read, or -1 if the end of the uncompressed input stream is reached

  Throws:

  IndexOutOfBoundsException - if len > b.length - off

  IOException - if an I/O error occurs or if this input stream is already closed

  See Also:

  FilterInputStream.in

• skip

  public long skip(long n)
            throws IOException

  Skips over and discards data from the input stream. This method may block until the specified number of bytes are read and skipped. Note: While n is given as a long, the maximum number of bytes which can be skipped is Integer.MAX_VALUE.

  Overrides:

  skip in class FilterInputStream

  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

• 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:

  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

• markSupported

  public boolean markSupported()

  Always returns false because this input stream does not support the mark() and reset() methods.

  Overrides:

  markSupported in class FilterInputStream

  Returns:

  false, always

  See Also:

  FilterInputStream.in, InputStream.mark(int), InputStream.reset()

• mark

  public void mark(int limit)

  This operation is not supported.

  Overrides:

  mark in class FilterInputStream

  Parameters:

  limit - maximum bytes that can be read before invalidating the position marker

  See Also:

  FilterInputStream.in, FilterInputStream.reset()

• reset

  public void reset()
             throws IOException

  This operation is not supported.

  Overrides:

  reset in class FilterInputStream

  Throws:

  IOException - always thrown

  See Also:

  FilterInputStream.in, FilterInputStream.mark(int)