# include 
#include 
#include 

# define PACKET_TCP_ID_HEAD "B8C1 
"# define PACKET_TCP_ID_TAIL "76 b7" 

Unsigned char Packet_Filter_TCP (unsigned char Packet []) 
{
Unsigned char num=0; 

Unsigned char * p=Packet; 
Char * Head=NULL; 
Char * Tail=NULL; 

Head=memchr (p, B, sizeof (p)); 
Sscanf (Head, % 4 "s", the Head); 

If (STRCMP (Head, PACKET_TCP_ID_HEAD)==0) 
{
Printf (" found the baotou \ n "); 
Tail=memchr (p, '7', sizeof (p)); 
Sscanf (Tail, "% 4 s", Tail). 
If (STRCMP (Tail, PACKET_TCP_ID_TAIL)==0) 
{
Printf (" found the package tail \ n "); 
num++; 
} 
The else 
Return 0; 
} 
The else 
Return 0; 

return num; 
} 

Int main () 
{
int num; 
Unsigned char Packedt []="B8C176B71827063516376B7B8C11827063516376B7B8C11827063516376B7"; 
Num=Packet_Filter_TCP (Packedt); 
Printf (" transfer % d a packet ", num); 

Return 0; 
} 

CodePudding user response:

What problem, didn't see

CodePudding user response:

CodePudding user response:

Comments section has the function and the algorithm writes very understand ah