CHash类参考

---

详细描述

Collection of Hashing Functions.

This class implements a number of hashing functions like crc32, md5 and murmur.

在文件Hash.h第55行定义。

继承图，类CHash

所有成员的列表。

公有成员
	CHash ()
virtual	~CHash ()
virtual const char *	get_name () const
静态公有成员
static uint32_t	crc32 (uint8_t *data, int32_t len)
static void	MD5 (unsigned char *x, unsigned l, unsigned char *buf)
static uint32_t	MurmurHash2 (uint8_t *data, int32_t len, uint32_t seed)
static uint32_t	IncrementalMurmurHash2 (uint8_t data, uint32_t h)
静态保护成员
static void	MD5Init (struct MD5Context *context)
static void	MD5Update (struct MD5Context *context, unsigned char const *buf, unsigned len)
static void	MD5Final (unsigned char digest[16], struct MD5Context *context)
static void	MD5Transform (uint32_t buf[4], uint32_t const in[16])

---

构造及析构函数文档

CHash

(

)

default constructor

在文件Hash.h第59行定义。

virtual ~CHash

(

)

[virtual]

default destructor

在文件Hash.h第61行定义。

---

成员函数文档

uint32_t crc32	(	uint8_t *	data,
		int32_t	len
	)		[static]

crc32 checksumming

参数:

data	data to checksum
len	length in number of bytes

在文件Hash.cpp第46行定义。

virtual const char* get_name

(

void

)

const [virtual]

返回:

object name

实现了CSGObject。

在文件Hash.h第99行定义。

uint32_t IncrementalMurmurHash2	(	uint8_t	data,
		uint32_t	h
	)		[static]

Incremental Murmur like Hash

参数:

data	byte to hash
h	initial seed / hash on subsequent calls

返回:

hash

在文件Hash.cpp第423行定义。

void MD5	(	unsigned char *	x,
		unsigned	l,
		unsigned char *	buf
	)		[static]

Wrapper for MD5 function compatible to OpenSSL interface.

参数:

x	data
l	length
buf	buf needs to provide an allocated array of 16 bytes for the digest.

在文件Hash.cpp第73行定义。

void MD5Final	(	unsigned char	digest[16],
		struct MD5Context *	context
	)		[static, protected]

Final wrapup - pad to 64-byte boundary with the bit pattern 1 0* (64-bit count of bits processed, MSB-first)

参数:

digest	the 64 byte hash
context	initialized MD5Context

在文件Hash.cpp第160行定义。

void MD5Init

(

struct MD5Context *

context

)

[static, protected]

Start MD5 accumulation. Set bit count to 0 and buffer to mysterious initialization constants.

参数:

context

MD5Context

在文件Hash.cpp第104行定义。

void MD5Transform	(	uint32_t	buf[4],
		uint32_t const	in[16]
	)		[static, protected]

The core of the MD5 algorithm, this alters an existing MD5 hash to reflect the addition of 16 longwords of new data. MD5Update blocks the data and converts bytes into longwords for this routine.

参数:

buf	16 byte
in	64 bytes

在文件Hash.cpp第220行定义。

void MD5Update	(	struct MD5Context *	context,
		unsigned char const *	buf,
		unsigned	len
	)		[static, protected]

Update context to reflect the concatenation of another buffer full of bytes.

参数:

context	initialized MD5Context
buf	buffer to hash
len	length of buffer

在文件Hash.cpp第115行定义。

uint32_t MurmurHash2	(	uint8_t *	data,
		int32_t	len,
		uint32_t	seed
	)		[static]

Murmur Hash2

参数:

data	data to checksum (needs to be 32bit aligned on some archs)
len	length in number of bytes
seed	initial seed

返回:

hash

在文件Hash.cpp第374行定义。

---

该类的文档由以下文件生成：

• Hash.h
• Hash.cpp