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:
Inflater

  • Field Summary

    Fields 
    Modifier and Type Field Description
    protected byte[] buf

    Input buffer for decompression.
    protected Inflater inf

    Decompressor for this stream.
    protected int len

    Length of input buffer.

  • Constructor Summary

    Constructors 
    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.
    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.lang.Object

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

  • Field Details

    • inf

      Decompressor for this stream.

    • buf

      protected byte[] buf

      Input buffer for decompression.

    • len

      protected int len

      Length of input buffer.

  • Constructor Details

    • InflaterInputStream

      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

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

      Parameters:
      in - the input stream
      inf - the decompressor ("inflater")

    • InflaterInputStream

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

      Parameters:
      in - the input stream

  • Method Details

    • read

      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:
      FilterInputStream.in

    • read

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

      Reads uncompressed data into an array of 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.

      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 read, 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:
      FilterInputStream.in

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

    • skip

      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:
      InputStream.skipNBytes(long)

    • close

      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:
      FilterInputStream.in

    • fill

      Fills input buffer with more data to decompress.

      Throws:
      IOException - if an I/O error has occurred

    • 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:
      InputStream.mark(int), InputStream.reset()

    • mark

      public void mark​(int readlimit)

      Marks the current position in this input stream.

      The mark method of InflaterInputStream does nothing.

      Overrides:
      mark in class FilterInputStream
      Parameters:
      readlimit - the maximum limit of bytes that can be read before the mark position becomes invalid.
      See Also:
      InputStream.reset()

    • reset

      Repositions this stream to the position at the time the mark method was last called on this input stream.

      The method reset for class InflaterInputStream does nothing except throw an IOException.

      Overrides:
      reset in class FilterInputStream
      Throws:
      IOException - if this method is invoked.
      See Also:
      InputStream.mark(int), IOException