com.alibaba.innodb.java.reader.util

类 Ut0Crc32

java.lang.Object

com.alibaba.innodb.java.reader.util.Ut0Crc32

public class Ut0Crc32
extends Object

InnoDB page checksum utility.

CRC32 implementation from Facebook, based on the zlib implementation.

This file is translated based on ut/ut0crc32.cc in MySQL, and I make it from C language to Java language and reserve the original naming convention, so checkstyle should suppress the warnings.

Most of the code was taken from MySQL codebase. Here to acknowledge the copyright and author.

作者:

xu.zx

构造器概要

构造器

构造器和说明
Ut0Crc32()

方法概要

限定符和类型	方法和说明
static long	crc32(byte[] data, int offset, int len)
static long	crc32ByteByByte(byte[] data, int offset, int len)
static long	fromByteArray(byte[] bytes, int offset) Returns the long value whose little-endian representation is stored in the 8 bytes of bytes from offset.
static long	utCrc3264LowSw(long crc, long data, long[][] table) Calculate CRC32 over a 64-bit integer using a software implementation.
static long	utCrc328Sw(long crc, long data, long[][] table)
static long	utCrc32SwapByteorder(long i)

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

Ut0Crc32

public Ut0Crc32()

方法详细资料

crc32

public static long crc32(byte[] data,
                         int offset,
                         int len)

crc32ByteByByte

public static long crc32ByteByByte(byte[] data,
                                   int offset,
                                   int len)

utCrc3264LowSw

public static long utCrc3264LowSw(long crc,
                                  long data,
                                  long[][] table)

Calculate CRC32 over a 64-bit integer using a software implementation.

参数:

crc - crc32 checksum so far

data - data to be checksummed

table - base table to calculate

返回:

resulting checksum of crc + crc(data)

utCrc328Sw

public static long utCrc328Sw(long crc,
                              long data,
                              long[][] table)

utCrc32SwapByteorder

public static long utCrc32SwapByteorder(long i)

fromByteArray

public static long fromByteArray(byte[] bytes,
                                 int offset)

Returns the long value whose little-endian representation is stored in the 8 bytes of bytes from offset.