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DeflaterInputStream


java.util.zip

Class DeflaterInputStream

  • All Implemented Interfaces:
    Closeable, AutoCloseable


    public class DeflaterInputStream
    extends FilterInputStream
    An InputStream filter to compress data. Callers read compressed data in the "deflate" format from the uncompressed underlying stream.
    Since:
    1.6
    • Constructor Summary

      Constructors
      Constructor and Description
      DeflaterInputStream(InputStream in)
      Constructs a DeflaterInputStream with a new Deflater and an implementation-defined default internal buffer size.
      DeflaterInputStream(InputStream in, Deflater deflater)
      Constructs a DeflaterInputStream with the given Deflater and an implementation-defined default internal buffer size.
      DeflaterInputStream(InputStream in, Deflater deflater, int bufferSize)
      Constructs a DeflaterInputStream with the given Deflater and given internal buffer size.
    • Method Summary

      Methods
      Modifier and Type Method and Description
      int available()
      Returns 0 when when this stream has exhausted its input; and 1 otherwise.
      void close()
      Closes the underlying input stream and discards any remaining uncompressed data.
      void mark(int limit)
      This operation is not supported and does nothing.
      boolean markSupported()
      Returns false because DeflaterInputStream does not support mark/reset.
      int read()
      Reads a byte from the compressed input stream.
      int read(byte[] buffer, int offset, int byteCount)
      Reads compressed data into a byte buffer.
      void reset()
      This operation is not supported and throws IOException.
      long skip(long byteCount)
      Skips byteCount bytes in this stream.
    • Field Detail

      • buf

        protected final byte[] buf
    • Constructor Detail

      • DeflaterInputStream

        public DeflaterInputStream(InputStream in)
        Constructs a DeflaterInputStream with a new Deflater and an implementation-defined default internal buffer size. in is a source of uncompressed data, and this stream will be a source of compressed data.
        Parameters:
        in - the source InputStream
      • DeflaterInputStream

        public DeflaterInputStream(InputStream in,
                           Deflater deflater)
        Constructs a DeflaterInputStream with the given Deflater and an implementation-defined default internal buffer size. in is a source of uncompressed data, and this stream will be a source of compressed data.
        Parameters:
        in - the source InputStream
        deflater - the Deflater to be used for compression
      • DeflaterInputStream

        public DeflaterInputStream(InputStream in,
                           Deflater deflater,
                           int bufferSize)
        Constructs a DeflaterInputStream with the given Deflater and given internal buffer size. in is a source of uncompressed data, and this stream will be a source of compressed data.
        Parameters:
        in - the source InputStream
        deflater - the Deflater to be used for compression
        bufferSize - the length in bytes of the internal buffer
    • Method Detail

      • read

        public int read()
                 throws IOException
        Reads a byte from the compressed input stream. The result will be a byte of compressed data corresponding to an uncompressed byte or bytes read from the underlying stream.
        Overrides:
        read in class FilterInputStream
        Returns:
        the byte or -1 if the end of the stream has been reached.
        Throws:
        IOException - if the stream is closed or another IOException occurs.
      • read

        public int read(byte[] buffer,
               int offset,
               int byteCount)
                 throws IOException
        Reads compressed data into a byte buffer. The result will be bytes of compressed data corresponding to an uncompressed byte or bytes read from the underlying stream.
        Overrides:
        read in class FilterInputStream
        Parameters:
        buffer - the byte array in which to store the bytes read.
        offset - the initial position in buffer to store the bytes read from this stream.
        byteCount - the maximum number of bytes to store in buffer.
        Returns:
        the number of bytes read or -1 if the end of the compressed input stream has been reached.
        Throws:
        IOException - if this stream is closed or another I/O error occurs.
      • skip

        public long skip(long byteCount)
                  throws IOException
        Skips byteCount bytes in this stream. Subsequent calls to read will not return these bytes unless reset is used. This implementation skips byteCount bytes in the filtered stream.

        Note: if n > Integer.MAX_VALUE, this stream will only attempt to skip Integer.MAX_VALUE bytes.

        Overrides:
        skip in class FilterInputStream
        Parameters:
        byteCount - the number of bytes to skip.
        Returns:
        the number of bytes actually skipped.
        Throws:
        IOException - if this stream is closed or another IOException occurs.
        See Also:
        FilterInputStream.mark(int), FilterInputStream.reset()
      • available

        public int available()
                      throws IOException
        Returns 0 when when this stream has exhausted its input; and 1 otherwise. A result of 1 does not guarantee that further bytes can be returned, with or without blocking.

        Although consistent with the RI, this behavior is inconsistent with InputStream.available(), and violates the Liskov Substitution Principle. This method should not be used.

        Overrides:
        available in class FilterInputStream
        Returns:
        0 if no further bytes are available. Otherwise returns 1, which suggests (but does not guarantee) that additional bytes are available.
        Throws:
        IOException - if this stream is closed or an error occurs


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