java.util.zip

## Class GZIPInputStream

- java.lang.Object
- - java.io.InputStream
  - - java.io.FilterInputStream
    - - java.util.zip.InflaterInputStream
      - - java.util.zip.GZIPInputStream

All Implemented Interfaces:
  Closeable

    public class GZIPInputStream
    extends InflaterInputStream

This class implements a stream filter for reading compressed data in the GZIP file format.

See Also:
  `InflaterInputStream`

### Field Summary

Fields
`protected CRC32` `crc` CRC-32 for uncompressed data.
`protected boolean` `eos` Indicates end of input stream.
`static int` `GZIP_MAGIC` GZIP header magic number.

### Fields inherited from class java.util.zip.InflaterInputStream

`buf, inf, len`

### Fields inherited from class java.io.FilterInputStream

`in`

### Constructor Summary

Constructors
Constructor and Description
`GZIPInputStream(InputStream in)` Creates a new input stream with a default buffer size.
`GZIPInputStream(InputStream in, int size)` Creates a new input stream with the specified buffer size.

### Method Summary

Methods
`void` `close()` Closes this input stream and releases any system resources associated with the stream.
`int` `read(byte[] buf, int off, int len)` Reads uncompressed data into an array of bytes.

### Methods inherited from class java.util.zip.InflaterInputStream

`available, fill, mark, markSupported, read, reset, skip`

### Methods inherited from class java.io.FilterInputStream

`read`

### Methods inherited from class java.lang.Object

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

### Field Detail

#### crc

    protected CRC32 crc

CRC-32 for uncompressed data.

#### eos

    protected boolean eos

Indicates end of input stream.

#### GZIP_MAGIC

    public static final int GZIP_MAGIC

GZIP header magic number.

See Also:
  Constant Field Values

### Constructor Detail

#### GZIPInputStream

    public GZIPInputStream(InputStream in,
                   int size)
                    throws IOException

Creates a new input stream with the specified buffer size.

Parameters:
  `in` - the input stream
  `size` - the input buffer size
Throws:
  `IOException` - if an I/O error has occurred
  `IllegalArgumentException` - if size is <= 0

#### GZIPInputStream

    public GZIPInputStream(InputStream in)
                    throws IOException

Creates a new input stream with a default buffer size.

Parameters:
  `in` - the input stream
Throws:
  `IOException` - if an I/O error has occurred

### Method Detail

#### read

    public int read(byte[] buf,
           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 `InflaterInputStream`
Parameters:
  `buf` - 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 stream is reached
Throws:
  `NullPointerException` - If `buf` is `null`.
  `IndexOutOfBoundsException` - If `off` is negative, `len` is negative, or `len` is greater than `buf.length - off`
  `IOException` - if an I/O error has occurred or the compressed input data is corrupt
See Also:
  `FilterInputStream.in`

#### close

    public void close()
               throws IOException

Closes this input stream and releases any system resources associated with the stream.

Specified by:
  `close` in interface `Closeable`
Overrides:
  `close` in class `InflaterInputStream`
Throws:
  `IOException` - if an I/O error has occurred
See Also:
  `FilterInputStream.in`

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