X-Git-Url: https://git.dogcows.com/gitweb?p=chaz%2Fthecheat;a=blobdiff_plain;f=cheat_net.m;fp=cheat_net.m;h=be27b7c5315c812b4eeeeb30cde499ac85fc90cd;hp=0000000000000000000000000000000000000000;hb=42cf7bbe564d70233a0d73baee613f209eb00eb6;hpb=2d60a59a8ad195dd0af8f90c8d5b74a69ce7f4fa

diff --git a/cheat_net.m b/cheat_net.m
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index 0000000..be27b7c
--- /dev/null
+++ b/cheat_net.m
@@ -0,0 +1,113 @@
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Project:   The Cheat
+//
+// File:      cheat_net.m
+// Created:   Mon Sep 08 2003
+//
+// Copyright: 2003 Chaz McGarvey.  All rights reserved.
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+#include "cheat_net.h"
+
+
+u_int32_t RandomChecksum()
+{
+	u_int8_t		byte1, byte2, byte3, byte4;
+	char			*ptr;
+	
+	u_int32_t		checksum;
+	long			randomValue = random();
+
+	byte1 = randomValue & 0xFF;
+	byte2 = (randomValue >> 8) & 0xFF;
+	byte3 = (randomValue >> 16) & 0xFF;
+	byte4 = CountBits( byte1 ) + CountBits( byte2 ) + CountBits( byte3 );
+	
+	ptr = (char *)(&checksum);
+
+	COPY_TO_BUFFER( ptr, &byte1, sizeof(byte1) );
+	COPY_TO_BUFFER( ptr, &byte2, sizeof(byte2) );
+	COPY_TO_BUFFER( ptr, &byte3, sizeof(byte3) );
+	COPY_TO_BUFFER( ptr, &byte4, sizeof(byte4) );
+
+	return checksum;
+}
+
+char VerifyChecksum( u_int32_t checksum )
+{
+	u_int8_t		byte1, byte2, byte3, byte4;
+	char			*ptr = (char *)(&checksum);
+
+	COPY_FROM_BUFFER( &byte1, ptr, sizeof(byte1) );
+	COPY_FROM_BUFFER( &byte2, ptr, sizeof(byte2) );
+	COPY_FROM_BUFFER( &byte3, ptr, sizeof(byte3) );
+	COPY_FROM_BUFFER( &byte4, ptr, sizeof(byte4) );
+
+	if ( (CountBits( byte1 ) + CountBits( byte2 ) + CountBits( byte3 )) == byte4 )
+	{
+		return 1;
+	}
+
+	NSLog( @"checksum failed" );
+
+	return 0;
+}
+
+int CountBits( u_int8_t byte )
+{
+	int				count = 0;
+	int				i;
+
+	for ( i = 0; i < 8; i++ )
+	{
+		count += byte & 1;
+
+		byte >>= 1;
+	}
+
+	return count;
+}
+
+
+int SendBuffer( int sockfd, char const *buffer, int *length )
+{
+	int				bytesSent = 0;
+	int				bytesLeft = *length;
+	int				n = 0;
+
+	while( bytesSent < *length )
+	{
+		if ( (n = send( sockfd, buffer+bytesSent, bytesLeft, 0 )) == -1 )
+		{
+			break;
+		}
+
+		bytesSent += n;
+		bytesLeft -= n;
+	}
+
+	*length = bytesSent;
+
+	return (n == -1)? -1:0;
+}
+
+int ReadBuffer( int sockfd, char *buffer, int length )
+{
+	int				bytesRead = 0;
+	int				bytesLeft = length;
+	int				n;
+
+	while( bytesRead < length )
+	{
+		if ( (n = recv( sockfd, buffer+bytesRead, bytesLeft, 0 )) == -1 || n == 0 )
+		{
+			return (bytesRead > 0)? bytesRead:n;
+		}
+
+		bytesRead += n;
+		bytesLeft -= n;
+	}
+
+	return bytesRead;
+}
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