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CRC32

public class CRC32
extends Object implements Checksum

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


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

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

See also:

Summary

Public constructors

CRC32()

Creates a new CRC32 object.

Public methods

long getValue()

Returns CRC-32 value.

void reset()

Resets CRC-32 to initial value.

void update(byte[] b)

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

void update(ByteBuffer buffer)

Updates the checksum with the bytes from the specified buffer.

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

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

void update(int b)

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

Inherited methods

From class java.lang.Object
From interface java.util.zip.Checksum

Public constructors

CRC32

added in API level 1
CRC32 ()

Creates a new CRC32 object.

Public methods

getValue

added in API level 1
long getValue ()

Returns CRC-32 value.

Returns
long the current checksum value

reset

added in API level 1
void reset ()

Resets CRC-32 to initial value.

update

added in API level 1
void update (byte[] b)

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

Parameters
b byte: the array of bytes to update the checksum with

update

added in API level 26
void update (ByteBuffer buffer)

Updates the checksum with the bytes from the specified buffer. The checksum is updated using buffer.remaining() bytes starting at buffer.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 1
void update (byte[] b, 
                int off, 
                int len)

Updates the CRC-32 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 greater than the length of the array b

update

added in API level 1
void update (int b)

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

Parameters
b int: the byte to update the checksum with

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