GZIPInputStream

public class GZIPInputStream
extends InflaterInputStream

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

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

Summary

Constants
`int`	`GZIP_MAGIC` GZIP header magic number.

Fields
`protected CRC32`	`crc` CRC-32 for uncompressed data.
`protected boolean`	`eos` Indicates end of input stream.

Inherited fields

From class java.util.zip.InflaterInputStream

`protected byte[]`	`buf` Input buffer for decompression.
`protected boolean`	`closed` This field was deprecated in API level 29. This field will be removed from a future version of Android and should not be used. Subclasses that access this field need to be modified to keep track of their own closed state by overriding close().
`protected Inflater`	`inf` Decompressor for this stream.
`protected int`	`len` Length of input buffer.

From class java.io.FilterInputStream


    protected
    
    
    InputStream

in

The input stream to be filtered.

Public constructors
`GZIPInputStream(InputStream in, int size)` Creates a new input stream with the specified buffer size.
`GZIPInputStream(InputStream in)` Creates a new input stream with a default buffer size.

Public 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.

Inherited methods

From class java.util.zip.InflaterInputStream

`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.
`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.

From class java.io.FilterInputStream

`int`	`available()` Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream.
`void`	`close()` Closes this input stream and releases any system resources associated with the stream.
`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 the next byte of data from this input stream.
`int`	`read(byte[] b, int off, int len)` Reads up to `len` bytes of data from this input stream into an array of bytes.
`int`	`read(byte[] b)` Reads up to `b.length` bytes of data from this input stream 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 over and discards `n` bytes of data from the input stream.

From class java.io.InputStream

`int`	`available()` Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking, which may be 0, or 0 when end of stream is detected.
`void`	`close()` Closes this input stream and releases any system resources associated with the stream.
`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.
`static InputStream`	`nullInputStream()` Returns a new `InputStream` that reads no bytes.
`int`	`read(byte[] b)` Reads some number of bytes from the input stream and stores them into the buffer array `b`.
`abstract int`	`read()` Reads the next byte of data from the input stream.
`int`	`read(byte[] b, int off, int len)` Reads up to `len` bytes of data from the input stream into an array of bytes.
`byte[]`	`readAllBytes()` Reads all remaining bytes from the input stream.
`int`	`readNBytes(byte[] b, int off, int len)` Reads the requested number of bytes from the input stream into the given byte array.
`byte[]`	`readNBytes(int len)` Reads up to a specified number of bytes from the input stream.
`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 over and discards `n` bytes of data from this input stream.
`void`	`skipNBytes(long n)` Skips over and discards exactly `n` bytes of data from this input stream.
`long`	`transferTo(OutputStream out)` Reads all bytes from this input stream and writes the bytes to the given output stream in the order that they are read.

From class java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

From interface java.io.Closeable


      close()

Closes this stream and releases any system resources associated with it.

From interface java.lang.AutoCloseable


      close()

Closes this resource, relinquishing any underlying resources.

Constants

GZIP_MAGIC

public static final int GZIP_MAGIC

GZIP header magic number.

Constant Value: 35615 (0x00008b1f)

Fields

crc

protected CRC32 crc

CRC-32 for uncompressed data.

eos

protected boolean eos

Indicates end of input stream.

Public constructors

public GZIPInputStream (InputStream in, 
                int size)

Creates a new input stream with the specified buffer size. Android-note: Android limits the number of UnbufferedIO operations that can be performed, so consider using buffered inputs with this class. More information can be found in the UnbufferedIO and StrictMode documentation.

Parameters
`in`	`InputStream`: the input stream
`size`	`int`: the input buffer size

Throws
`ZipException`	if a GZIP format error has occurred or the compression method used is unsupported
`IOException`	if an I/O error has occurred
`IllegalArgumentException`	if `size <= 0`

GZIPInputStream

public GZIPInputStream (InputStream in)

Creates a new input stream with a default buffer size.

Parameters
`in`	`InputStream`: the input stream

Throws
`ZipException`	if a GZIP format error has occurred or the compression method used is unsupported
`IOException`	if an I/O error has occurred

Public methods

close

public void close ()

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

Throws
`IOException`	if an I/O error has occurred

read

public int read (byte[] buf, 
                int off, 
                int len)

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.

Parameters
`buf`	`byte`: the buffer into which the data is read
`off`	`int`: the start offset in the destination array `b`
`len`	`int`: the maximum number of bytes read

Returns
`int`	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`
`ZipException`	if the compressed input data is corrupt.
`IOException`	if an I/O error has occurred.