blob_read_from_file(&disk, zOPath);     
      content_get(rid, &a);
      blob_delta_apply(&a, &delta, &b);
      if( blob_compare(&disk, &a)==0 ){
        blob_write_to_file(&b, zNPath);
        printf("UPDATE %s\n", zNew);
      }else{
        int rc = merge_3way(&a, zOPath, &b, &out);
        blob_write_to_file(&out, zNPath);
        if( rc ){
          printf("CONFLICT %s\n", zNew);
          nConflict++;
        }else{
          printf("MERGE %s\n", zNew);
        }