宏定义
#define	BASE 65521UL
#define	NMAX 5552
#define	DO1(buf, i) {adler += (buf)[i]; sum2 += adler;}
#define	DO2(buf, i) DO1(buf,i); DO1(buf,i+1);
#define	DO4(buf, i) DO2(buf,i); DO2(buf,i+2);
#define	DO8(buf, i) DO4(buf,i); DO4(buf,i+4);
#define	DO16(buf) DO8(buf,0); DO8(buf,8);
#define	NO_DIVIDE
#define	MOD(a)
#define	MOD4(a)
函数
unsigned int	CountAdler32 (unsigned int adler, const unsigned char *buf, unsigned int len)

宏定义文档

#define BASE 65521UL

#define DO1	(	buf,
		i
	)	{adler += (buf)[i]; sum2 += adler;}

#define DO16 ( buf ) DO8(buf,0); DO8(buf,8);

#define DO2	(	buf,
		i
	)	DO1(buf,i); DO1(buf,i+1);

#define DO4	(	buf,
		i
	)	DO2(buf,i); DO2(buf,i+2);

#define DO8	(	buf,
		i
	)	DO4(buf,i); DO4(buf,i+4);

#define MOD ( a )

值:

do { \
        if (a >= (BASE << 16)) a -= (BASE << 16); \
        if (a >= (BASE << 15)) a -= (BASE << 15); \
        if (a >= (BASE << 14)) a -= (BASE << 14); \
        if (a >= (BASE << 13)) a -= (BASE << 13); \
        if (a >= (BASE << 12)) a -= (BASE << 12); \
        if (a >= (BASE << 11)) a -= (BASE << 11); \
        if (a >= (BASE << 10)) a -= (BASE << 10); \
        if (a >= (BASE << 9)) a -= (BASE << 9); \
        if (a >= (BASE << 8)) a -= (BASE << 8); \
        if (a >= (BASE << 7)) a -= (BASE << 7); \
        if (a >= (BASE << 6)) a -= (BASE << 6); \
        if (a >= (BASE << 5)) a -= (BASE << 5); \
        if (a >= (BASE << 4)) a -= (BASE << 4); \
        if (a >= (BASE << 3)) a -= (BASE << 3); \
        if (a >= (BASE << 2)) a -= (BASE << 2); \
        if (a >= (BASE << 1)) a -= (BASE << 1); \
        if (a >= BASE) a -= BASE; \
    } while (0)

#define MOD4 ( a )

值:

do { \
        if (a >= (BASE << 4)) a -= (BASE << 4); \
        if (a >= (BASE << 3)) a -= (BASE << 3); \
        if (a >= (BASE << 2)) a -= (BASE << 2); \
        if (a >= (BASE << 1)) a -= (BASE << 1); \
        if (a >= BASE) a -= BASE; \
    } while (0)

#define NMAX 5552

#define NO_DIVIDE

函数文档

unsigned int CountAdler32	(	unsigned int	adler,
		const unsigned char *	buf,
		unsigned int	len
	)

Adler32校检码计算

参数:

adler	初始码
buf	待校验数据指针
len	待校验数据长度

返回:: 校检码