com.tencent.cos.xml.utils

类 CRC64

java.lang.Object

com.tencent.cos.xml.utils.CRC64

所有已实现的接口:

java.util.zip.Checksum

public class CRC64
extends java.lang.Object
implements java.util.zip.Checksum

CRC-64 implementation with ability to combine checksums calculated over different blocks of data. Standard ECMA-182, http://www.ecma-international.org/publications/standards/Ecma-182.htm

构造器概要

构造器

构造器和说明
CRC64()
CRC64(byte[] b, int len)
CRC64(long value)

方法概要

限定符和类型	方法和说明
static CRC64	combine(CRC64 summ1, CRC64 summ2, long len2)
static long	combine(long crc1, long crc2, long len2)
static CRC64	fromBytes(byte[] b) Construct new CRC64 instance from byte array.
byte[]	getBytes() Get 8 byte representation of current CRC64 value.
long	getValue() Get long representation of current CRC64 value.
void	reset() Resets the checksum to its initial value.
void	update(byte b) Update CRC64 with new byte.
void	update(byte[] b, int len) Update CRC64 with new byte block.
void	update(byte[] b, int off, int len) Updates the current checksum with the specified array of bytes.
void	update(int b) Updates the current checksum with the specified byte.

从类继承的方法 java.lang.Object

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

构造器详细资料

CRC64

public CRC64()

CRC64

public CRC64(long value)

CRC64

public CRC64(byte[] b,
             int len)

方法详细资料

fromBytes

public static CRC64 fromBytes(byte[] b)

Construct new CRC64 instance from byte array.

getBytes

public byte[] getBytes()

Get 8 byte representation of current CRC64 value.

getValue

public long getValue()

Get long representation of current CRC64 value.

指定者:

getValue 在接口中 java.util.zip.Checksum

返回:

the current checksum value

update

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

Update CRC64 with new byte block.

update

public void update(byte b)

Update CRC64 with new byte.

update

public void update(int b)

从接口复制的说明: java.util.zip.Checksum

Updates the current checksum with the specified byte.

指定者:

update 在接口中 java.util.zip.Checksum

参数:

b - the byte to update the checksum with

update

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

从接口复制的说明: java.util.zip.Checksum

Updates the current checksum with the specified array of bytes.

指定者:

update 在接口中 java.util.zip.Checksum

参数:

b - the byte array to update the checksum with

off - the start offset of the data

len - the number of bytes to use for the update

reset

public void reset()

从接口复制的说明: java.util.zip.Checksum

Resets the checksum to its initial value.

指定者:

reset 在接口中 java.util.zip.Checksum

combine

public static CRC64 combine(CRC64 summ1,
                            CRC64 summ2,
                            long len2)

combine

public static long combine(long crc1,
                           long crc2,
                           long len2)