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Java™ Platform
Standard Ed. 7
java.util.zip

Class DeflaterInputStream

    • Field Summary

      Fields
      Modifier and Type Field and Description
      protected byte[] buf
      Input buffer for reading compressed data.
      protected Deflater def
      Compressor for this stream.

    • Method Summary

      Methods
      Modifier and Type Method and Description
      int available ()
      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 markSupported ()
      Always returns false because this input stream does not support the mark() and reset() methods.
      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.

    • 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 is <= 0
        NullPointerException - if in or defl is null

    • Method Detail

      • 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
Java™ Platform
Standard Ed. 7

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