EclaireXL

#include <stdio.h>

#include <string>

int main(int argc, char ** argv)

{

if (argc!=5)

{

fprintf(stderr,"Expected pattern_file,pattern_offset,pattern_len,match_file\n");

return -1;

}

std::string pattern = argv[1];

int offset = atoi(argv[2]);

int len = atoi(argv[3]);

std::string find_in_here = argv[4];

FILE * p = fopen(pattern.c_str(),"rb");

if (!p)

{

fprintf(stderr,"Unable to open %s\n",pattern.c_str());

return -1;

}

fseek(p,offset,SEEK_SET);

unsigned char * data = (unsigned char *)malloc(len);

if (fread(data,1,len,p)!=len)

{

fprintf(stderr,"Unable to read pattern\n");

return -1;

}

fclose(p);

FILE * f = fopen(find_in_here.c_str(),"rb");

if (!f)

{

fprintf(stderr,"Unable to open %s\n",find_in_here.c_str());

return -1;

}

int file_offset = 0;

unsigned char * match = (unsigned char *)malloc(len);

bool found = false;

while (!found)

{

fseek(f,file_offset,SEEK_SET);

if (fread(match,1,len,f) !=len)

break;

found = true;

for (int i=0;i!=len;++i)

{

//printf("%d:%d:%02x %02x\n",file_offset,i,match[i],data[i]);

if (match[i]!=data[i])

{

found = false;

break;

}

}

if (found)

{

printf("%08x",file_offset);

break;

}

++file_offset;

}

fclose(f);

free(match);

free(data);

if (found)

return 0;

else

return -1;

}