CRC32C

public final class CRC32C
extends Object implements Checksum

java.lang.Object
↳	java.util.zip.CRC32C

A class that can be used to compute the CRC-32C of a data stream.

CRC-32C is defined in RFC 3720: Internet Small Computer Systems Interface (iSCSI).

Passing a null argument to a method in this class will cause a NullPointerException to be thrown.

Summary

Public constructors
`CRC32C()` Creates a new CRC32C object.

Public methods
`long`	`getValue()` Returns CRC-32C value.
`void`	`reset()` Resets CRC-32C to initial value.
`void`	`update(ByteBuffer buffer)` Updates the CRC-32C checksum with the bytes from the specified buffer.
`void`	`update(byte[] b, int off, int len)` Updates the CRC-32C checksum with the specified array of bytes.
`void`	`update(int b)` Updates the CRC-32C checksum with the specified byte (the low eight bits of the argument b).

Inherited methods

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.util.zip.Checksum

`abstract long`	`getValue()` Returns the current checksum value.
`abstract void`	`reset()` Resets the checksum to its initial value.
`default void`	`update(byte[] b)` Updates the current checksum with the specified array of bytes.
`default void`	`update(ByteBuffer buffer)` Updates the current checksum with the bytes from the specified buffer.
`abstract void`	`update(byte[] b, int off, int len)` Updates the current checksum with the specified array of bytes.
`abstract void`	`update(int b)` Updates the current checksum with the specified byte.

Public constructors

CRC32C

Added in API level 34

public CRC32C ()

Creates a new CRC32C object.

Public methods

getValue

Added in API level 34

public long getValue ()

Returns CRC-32C value.

Returns
`long`	the current checksum value

reset

Added in API level 34

public void reset ()

Resets CRC-32C to initial value.

update

Added in API level 34

public void update (ByteBuffer buffer)

Updates the CRC-32C checksum with the bytes from the specified buffer. The checksum is updated with the remaining bytes in the buffer, starting at the buffer's position. Upon return, the buffer's position will be updated to its limit; its limit will not have been changed.

Parameters
`buffer`	`ByteBuffer`: the ByteBuffer to update the checksum with

update

Added in API level 34

public void update (byte[] b, 
                int off, 
                int len)

Updates the CRC-32C checksum with the specified array of bytes.

Parameters
`b`	`byte`: the byte array to update the checksum with
`off`	`int`: the start offset of the data
`len`	`int`: the number of bytes to use for the update

Throws
`ArrayIndexOutOfBoundsException`	if `off` is negative, or `len` is negative, or `off+len` is negative or greater than the length of the array `b`.

update

Added in API level 34

public void update (int b)

Updates the CRC-32C checksum with the specified byte (the low eight bits of the argument b).

Parameters
`b`	`int`: the byte to update the checksum with