CRC.rar_ crc client server_crc

/* filename:sever.cpp maker:brightboyqiang date:2007-5-23 */ #include <stdio.h> #include<math.h> #include "winsock2.h" #pragma comment( lib, "Ws2_32.lib" ) int length(int a); void main() { WSADATA wsaData; int iResult = WSAStartup( MAKEWORD(2,2), &wsaData ); if ( iResult != NO_ERROR ) printf("Error at WSAStartup()\n"); SOCKET m_socket; m_socket = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ); if ( m_socket == INVALID_SOCKET ) { printf( "Error at socket(): %ld\n", WSAGetLastError() ); WSACleanup(); return; } sockaddr_in service; service.sin_family = AF_INET; service.sin_addr.s_addr = inet_addr( "127.0.0.1" ); service.sin_port = htons( 27015 ); if ( bind( m_socket, (SOCKADDR*) &service, sizeof(service) ) == SOCKET_ERROR ) { printf( "bind() failed.\n" ); closesocket(m_socket); return; } if ( listen( m_socket, 1 ) == SOCKET_ERROR ) printf( "Error listening on socket.\n"); SOCKET AcceptSocket; printf( "Waiting for a client to connect...\n" ); while (1) { AcceptSocket = SOCKET_ERROR; while ( AcceptSocket == SOCKET_ERROR ) { AcceptSocket = accept( m_socket, NULL, NULL ); } printf( "Client Connected.\n"); m_socket = AcceptSocket; break; } int bytesSent; int revlength; int bytesRecv = SOCKET_ERROR; char sendbuf[32] = "CRC is successful!"; char sendbuf1[32]="CRC is not successful!"; char recvbuf[32] = ""; bytesRecv = recv( m_socket, recvbuf, 32, 0 ); revlength=strlen(recvbuf); int i=0,j=0,a=0,b=0; char c[32]; printf("%s",recvbuf); printf("\n"); for(i=0;i<=revlength-1;i++) { j=recvbuf[i]-48; a+=(int)(j*pow(2,revlength-i-1)); } printf("请输入生成多项式:"); scanf("%s",c); int charlength; charlength=strlen(c); for(i=0;i<=charlength-1;i++) { j=c[i]-48; b+=(int)(j*pow(2,charlength-i-1)); } int n1=length(a); int n2=length(b); int n3=n2; a=a<<(n2-1); b=b<<(n1-1); a=a^b; while(a>pow(2,n3-1)-1) { n1=length(a); n2=length(b); b=b>>(n2-n1); a=a^b; } if(a==0) bytesSent = send( m_socket, sendbuf,strlen(sendbuf), 0 ); else bytesSent=send(m_socket,sendbuf1,strlen(sendbuf1),0); printf( "Bytes Sent: %ld\n", bytesSent ); } int length(int a) { int i=20; while(!(a>=pow(2,i) && a<pow(2,i+1))) { i--; } return i+1; }