r00tsecurity -> Source Code Center

void *FindMemory( void *begin, unsigned int look_size, 
                    unsigned char *search, unsigned int len )
{
     if begin == NULL || look_size == 0 || search == NULL || len == 0 )
         return NULL;
         
     //begin search
     bool isFound = false;
     for( unsigned int i = 0; i < look_size; i++ )
     {
          if( *(unsigned char *)(begin + i ) == search[0] )
          {
              for( unsigned int j = 1; j < len; j++ )
              {
                   if( *(unsigned char *)(begin + i + j ) == search[j] )
                       isFound = true;
                   else
                   {
                       isFound = false;
                       break;
                   }
              }
          }
          if( isFound == true )
              return (void *)( begin + i );
     }
     
     return NULL;
}
 
//Takes the found addr \\\'memory\\\' and writes the \\\'patch\\\' of length \\\'patch_len\\\' with a filler if the 
//patch is less then the original memory contents \\\'filler\\\'
int PatchMemory( void *memory, int orig_size, unsigned char *patch, int patch_len, unsigned char filler )
{
    if( puid == 0 || memory == NULL || orig_size == 0 || patch == NULL || patch_len == 0 )
        return -1;
        
    if( orig_size < patch_size )
        return -10;
        
    for( unsigned int i = 0; i < patch_len )
    {
         *(unsigned char *)( memory + i ) = *(unsigned char *)(patch + i );
    }
    
    if( orig_size > patch_len )
    {
        orig_size -= patch_len;
        
        for( unsigned int i = 0; i < orig_size; i++ )
        {
             *(unsigned char *)( memory + patch_len + i + 1 ) = filler;
        }
    }
    
    return 0;
}