CRC64 (Aliyun OSS SDK for Java 3.13.2 API)

Constructors
Constructor and Description
`CRC64()`
`CRC64(byte[] b, int len)`
`CRC64(long value)`

Methods
Modifier and Type	Method and Description
`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()`
`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)`
`void`	`update(int b)`

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.

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

Update CRC64 with new byte block.

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

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

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

Class CRC64