基本上是在尝试制作防病毒软件,但是当我尝试将受感染的文件读入缓冲区时,我得到的只是 EOF ......这是一个 jpg,我不知道如何解决这个问题
关于我可以使用的文件函数: fread/fwrite fgets fputs fclose fopen fgetc fputc fscanf fprintf
int fullScan(FILE* sign, FILE* infected);
char* getFile(FILE* file);
int main(int argc, char** argv)
{
FILE* sign = fopen("KittenVirusSign", "rb");
FILE* infected = fopen("kitten_frog.jpg", "rb");
int j = 0;
if (infected == NULL)
{
printf("couldn't open the file (suspicious file)");
return -1;
}
if (sign == NULL)
{
printf("couldn't open the file (virus signature)");
return -1;
}
j = fullScan(sign, infected);
return 0;
}
int fullScan(FILE* sign, FILE* infected)
{
char* sign_c = NULL;
char* infec_c = NULL;
int infect_res = -1;
int sign_len = 0;
int infec_len = 0;
int i = 0;
int j = 0;
sign_c = getFile(sign);
infec_c = getFile(infected);
while (1)
{
if (*(infec_c + i) == *(sign_c + j))
{
infect_res = 1;
if (*(sign_c + j) == EOF)
{
break;
}
else if (*(infec_c + i) == EOF)
{
infect_res = -1;
break;
}
i++;
j++;
continue;
}
else if (*(infec_c + i) != *(sign_c + j))
{
if (*(infec_c + i) == EOF || *(sign_c + j) == EOF)
{
break;
}
i++;
j = 0;
infect_res = -1;
}
}
fclose(infected);
free(sign_c);
free(infec_c);
return infect_res;
}
char* getFile(FILE* file)
{
char* buffer;
long filelen;
int i;
fseek(file, 0, SEEK_END);
filelen = ftell(file);
fseek(file, 0, SEEK_SET);
buffer = (char *)malloc((filelen + 1)*sizeof(char));
for (i = 0; i < filelen; i++)
{
fread(buffer + i, sizeof(char), 1, file);
}
return buffer;
}