Line data    Source code

       1             : #include "../../burp.h"
       2             : #include "../backup_phase1.h"
       3             : 
       4             : #include <librsync.h>
       5             : #include <math.h>
       6             : 
       7             : /* Need to base librsync block length on the size of the old file, otherwise
       8             :    the risk of librsync collisions and silent corruption increases as the
       9             :    size of the new file gets bigger. */
      10           0 : size_t get_librsync_block_len(const char *endfile)
      11             : {
      12           0 :         size_t ret=0;
      13           0 :         uint64_t oldlen=0;
      14           0 :         oldlen=strtoull(endfile, NULL, 10);
      15           0 :         ret=(size_t)(ceil(sqrt(oldlen)/16)*16); // round to a multiple of 16.
      16           0 :         if(ret<64) return 64; // minimum of 64 bytes.
      17           0 :         return ret;
      18             : }