CRC32

The CRC32 class is used to compute a CRC32 checksum from data provided as input value. See also


        
         Adler32

which is almost as good, but cheaper.

Summary

Public Constructors
	CRC32 ()

Public Constructors

CRC32 ()

Public Methods
long	getValue () Returns the CRC32 checksum for all input received.
void	reset () Resets the CRC32 checksum to it initial state.
void	update (byte[] buf, int offset, int byteCount) Update this `CRC32` checksum with the contents of `buf` , starting from `offset` and reading `byteCount` bytes of data.
void	update (int val) Updates this checksum with the byte value provided as integer.
void	update (byte[] buf) Updates this checksum with the bytes contained in buffer `buf` .

Public Methods

long

getValue ()

Returns the CRC32 checksum for all input received.

void

reset ()

Resets the CRC32 checksum to it initial state.

void

update (byte[] buf, int offset, int byteCount)

Update this


           CRC32

checksum with the contents of

buf

, starting from


           offset

and reading


           byteCount

bytes of data.

void

update (int val)

Updates this checksum with the byte value provided as integer.

void

update (byte[] buf)

Updates this checksum with the bytes contained in buffer

buf

[Expand]

Inherited Methods

From class java.lang.Object

Object	clone () Creates and returns a copy of this `Object` .
boolean	equals ( Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize () Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class <?>	getClass () Returns the unique instance of `Class` that represents this object's class.
int	hashCode () Returns an integer hash code for this object.
final void	notify () Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll () Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString () Returns a string containing a concise, human-readable description of this object.
final void	wait () Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait (long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait (long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

From interface java.util.zip.Checksum

Public Methods

public long getValue ()

Added in API level 1

Returns the CRC32 checksum for all input received.

Returns

The checksum for this instance.

public void reset ()

Added in API level 1

Resets the CRC32 checksum to it initial state.

public void update (byte[] buf, int offset, int byteCount)

Added in API level 1

Update this CRC32 checksum with the contents of buf , starting from offset and reading byteCount bytes of data.

Parameters

buf	the byte array from which to read the bytes.
offset	the initial position in `buf` to read the bytes from.
byteCount	the number of bytes to read from `buf` .

public void update (int val)

Added in API level 1

Updates this checksum with the byte value provided as integer.

Parameters

val	represents the byte to update the checksum.

public void update (byte[] buf)

Added in API level 1

Updates this checksum with the bytes contained in buffer buf .

Parameters

buf	the buffer holding the data to update the checksum with.

Results

Interfaces

Classes

Exceptions

Errors

Class Overview

Summary

Public Constructors

public CRC32 ()

Public Methods

public long getValue ()

Returns

public void reset ()

public void update (byte[] buf, int offset, int byteCount)

Parameters

public void update (int val)

Parameters

public void update (byte[] buf)

Parameters

java.lang.Object
↳	java.util.zip.CRC32