www.pudn.com > DrvFltIp_source.zip > sockUtil.cpp

#include "stdafx.h" 
#include "sockutil.h" 
#include  
#include  
 
/*++ 
 
Routine Description: 
 
    Convert the ip to the format we have to compare 
 
Arguments: 
 
    ip - string that represent a ip address 
 
 
Return Value: 
 
	ip  
 
--*/ 
unsigned long inet_addr(const char *sIp) 
{ 
	int octets[4]; 
	int i; 
	const char * auxCad = sIp; 
	unsigned long lIp = 0; 
	 
	//we extract each octet of the ip address 
	//atoi will get characters until it found a non numeric character(in our case '.') 
	for(i = 0; i < 4; i++) 
	{ 
		octets[i] = atoi(auxCad); 
 
		if(octets[i] < 0 || octets[i] > 255) 
			return 0; 
 
		lIp |= (octets[i] << (i*8)); 
 
		//update auxCad to point to the next octet 
		auxCad = strchr(auxCad, '.'); 
 
		if(auxCad == NULL && i!=3) 
			return -1; 
 
		auxCad++; 
	} 
 
 
	return lIp; 
} 
 
 
 
/*++ 
 
Routine Description: 
 
    Convert the port to the format we have to compare 
 
Arguments: 
 
    port - port to convert 
 
 
Return Value: 
 
	port converted 
 
--*/ 
unsigned short htons(unsigned short port) 
{ 
	unsigned short portRet; 
 
	portRet = ((port << 8) | (port >> 8)); 
 
	return portRet; 
}